JP5138654B2 - Construction machine swivel frame - Google Patents

Description

  The present invention relates to a swing frame of a construction machine that is preferably used for an upper swing body such as a hydraulic excavator, and in particular, has a configuration in which a swing post type working device is provided on the front side so as to be swingable left and right. The present invention relates to a swing frame of a construction machine.

  Generally, a construction machine such as a hydraulic excavator includes a lower traveling body, an upper revolving body that is turnably mounted on the lower traveling body, and a working device that is provided on the front side of the upper revolving body and performs excavation work of earth and sand. It is comprised by.

  In addition, a small hydraulic excavator or the like called a so-called small rear swivel type has a configuration in which a boom of a work device is connected to a swing frame of an upper swing body so as to be swingable left and right using a swing post or the like. The swing post type working device is employed (see, for example, Patent Documents 1 and 2).

  A swivel frame according to this type of prior art includes a bottom plate that is pivotably mounted on a lower traveling body, left and right vertical plates that are erected upward from the bottom plate and extend in front and rear of the bottom plate, The left and right vertical plates and the swing post mounting portion, which is provided on the front end side of the bottom plate and supports the swing post type working device so as to be swingable in the left and right directions, and the like.

Japanese Patent Laying-Open No. 2005-60976 JP 2005-336920 A

  By the way, in the above-described prior art, the left and right vertical plates are formed of a thick plate made of a highly rigid steel plate, and this plate is erected on the bottom plate so as to extend in the front and rear directions. The left and right vertical plates formed in this way receive the bending load received by the swing post mounting portion from the working device side together with the bottom plate.

  However, the left and right vertical plates in this case are inevitably heavy because the plate thickness and height must be increased in order to ensure sufficient strength. For this reason, the left and right vertical plates (that is, the left and right vertical beams) are an obstacle to reducing the size and weight of the construction machine, and the weight is reduced while ensuring sufficient strength. That is a big issue to consider.

  In addition, hydraulic hoses for supplying and discharging pressure oil from the hydraulic pump to and from a plurality of hydraulic actuators are arranged in the inner and outer sides of the left and right vertical plates so as to penetrate in the plate thickness direction. For this reason, a hole for inserting a hydraulic hose is provided in the middle of the vertical plate, and a protective member for protecting the hydraulic hose from contact with and interference with the vertical plate is provided around the hole processed portion. Measures such as additional provisions are necessary.

  As a result, there is a problem that extra work is required for the drilling of the insertion hole provided in the vertical plate, and the number of parts is increased by the protective member for the hydraulic hose, and the workability at the time of assembly is deteriorated. Furthermore, there is a problem that the strength of the vertical plate is reduced by drilling the vertical plate as described above.

  The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to secure a sufficient strength by forming a vertical beam using a pipe material having a frame structure instead of a vertical plate. It is another object of the present invention to provide a swivel frame for a construction machine that can be reduced in weight and can be reduced in weight.

  Another object of the present invention is to use a hollow cylindrical pipe member, so that it is not necessary to provide a special hole for an insertion hole for a hydraulic hose, and the hydraulic hose is protected from contact and interference. It is another object of the present invention to provide a turning frame for a construction machine that can eliminate the need for a protective member.

  In order to solve the above-described problems, the present invention provides a bottom plate provided on a lower traveling body via a swivel ring, and left and right vertical beams provided on the bottom plate and extending in the front and rear directions of the bottom plate. A swing post mounting portion that is located on the front side of the left and right vertical beams and that is provided on the front side of the bottom plate and supports a swing post type work device so as to be swingable in the left and right directions; , Applied to a swivel frame of a construction machine provided with a weight mounting portion that is provided on the rear side of the bottom plate and is mounted on the rear side of the right vertical beam.

  The left and right vertical beams extend along the front and rear directions of the bottom plate, the front swing post mounting portion and the rear weight mounting portion. Is constituted by a pipe material connected together with the bottom plate.

  According to a second aspect of the present invention, on the upper side of the bottom plate, there is provided a partition plate located on the front side of the weight mounting portion and extending in the left and right directions of the bottom plate, and the left and right portions made of the pipe material. The vertical beam is configured to extend in the forward and backward directions with the partition plate in between.

  According to a third aspect of the present invention, the bottom plate is provided with a turning wheel mounting portion to which the turning wheel is attached, and the left and right vertical beams made of the pipe material are located at the position of the turning wheel attachment portion. While joining with a bottom plate with a welding means, it is set as the structure joined with a welding means with respect to the said swing post attaching part.

  According to a fourth aspect of the present invention, the bottom plate is provided with a swivel wheel mounting portion to which the swivel wheel is mounted, and the left and right vertical beams made of the pipe material are located at the position of the swivel wheel mounting portion. While joining with a bottom plate with a welding means, it is set as the structure joined with a welding means with respect to the said weight attachment part.

  On the other hand, according to the invention of claim 5, the left and right vertical beams are a main pipe portion made of a long pipe material extending in the front and rear directions of the bottom plate, and between the main pipe portion and the bottom plate. And a plurality of reinforcing pipe portions made of a short pipe material extending in the upward, downward and / or oblique directions.

  According to the invention of claim 6, the main pipe portion is provided with the front end thereof joined to the swing post mounting portion by welding means, and the rear end side is bent downward and bent downward. The lower end of the rear bent portion is joined to the weight mounting portion by welding means.

  According to a seventh aspect of the present invention, the left and right vertical beams are provided with connecting pipe portions that connect the left and right vertical beams in the left and right directions.

  As described above, according to the first aspect of the invention, the left and right vertical beams extending in the front and rear directions on the upper side of the bottom plate can be formed using the pipe material, and sufficient strength as the vertical beam can be obtained. It can be ensured and can be reduced in weight. Then, the pipe material is extended forward and rearward on the upper side of the bottom plate, and arranged in a framework structure (for example, a triangular truss structure or a lattice structure), so that the front swing post mounting part and the rear weight mounting part Can be coupled together with the bottom plate, and the front swing post mounting portion and the rear weight mounting portion can be supported with sufficient strength.

  In addition, by forming the left and right vertical beams with a cylindrical structure made of cylindrical pipe material, there is no need to specially drill holes for hydraulic hoses and so on. The gap (space) can be utilized as an insertion hole for a hydraulic hose or the like. In addition, even if the hydraulic hose in this case contacts the pipe material, wear and damage of the hydraulic hose can be prevented because the circular pipe material is used. Thus, the number of parts can be reduced and workability during assembly can be improved.

  Further, the invention according to claim 2 can define a machine room for an engine, for example, located on the front side of the weight mounting portion by a partition plate extending leftward and rightward provided on the upper side of the bottom plate, The partition plate can prevent noise, heat, etc. from the engine from leaking outside the machine room. Also, the left and right vertical beams made of pipe material extend forward and backward with the partition plate in between, so the partition plate extending left and right on the bottom plate and the partition plate With the left and right vertical beams extending in the front and rear directions, the strength of the turning frame can be increased.

  According to the invention of claim 3, the left and right vertical beams formed by using the pipe material can be joined to the bottom plate by welding at the position of the swivel wheel mounting portion, and to the front swing post mounting portion. However, they can be joined by welding. Thereby, using the left and right vertical beams made of pipe material, the strength of the position near the swivel wheel mounting portion and the swing post mounting portion of the bottom plate can be increased.

  According to the invention of claim 4, the left and right vertical beams formed by using the pipe material can be joined to the bottom plate by welding at the position of the swivel wheel mounting portion, and to the rear weight mounting portion. However, they can be joined by welding. Thereby, the strength of the vicinity position of the swivel wheel mounting portion and the weight mounting portion can be increased by using the left and right vertical beams made of the pipe material.

  On the other hand, according to the invention of claim 5, the left and right vertical beams are composed of a main pipe portion made of a long pipe material and a plurality of reinforcing pipe portions made of a short pipe material. The reinforcing pipe portion can connect the bottom plate and the main pipe portion with a framework structure, and the main pipe portion can be firmly supported on the bottom plate. The front swing post mounting portion and the rear weight mounting portion can be connected together with the bottom plate by the reinforcing pipe portion and the main pipe portion forming the framework structure, and the front swing post mounting portion and the rear The weight mounting portion on the side can be supported with sufficient strength.

  In the invention of claim 6, the front end of the main pipe portion can be joined to the swing post mounting portion by welding or the like, and the rear end bent portion of the main pipe portion bent and bent downward is The lower end portion can be joined to the weight mounting portion by welding or the like. As a result, the front swing post mounting portion and the rear weight mounting portion can be coupled together with the bottom plate.

  Furthermore, according to the invention of claim 7, a connecting pipe portion is provided between the left and right vertical beams to connect the left and right beams in the left and right directions, so that the torsional rigidity and the like of the left and right vertical beams are connected. Even if an external force acts as a torsional load on the left and right vertical beams via the swing post mounting portion due to, for example, excavation reaction force from the work device, sufficient strength can be secured. it can.

1 is a front view showing a hydraulic excavator according to a first embodiment of the present invention. FIG. 2 is a perspective view showing a turning frame in a state where a cab, an exterior cover, a counterweight, and the like in FIG. 1 are removed. It is the perspective view which looked at the turning frame from the back side rather than FIG. It is the perspective view which looked at the turning frame from the opposite side to FIG. It is the perspective view which looked at the turning frame from the front side rather than FIG. It is the top view which looked at the turning frame of FIG. 2 from upper direction. It is a perspective view which expands and shows the center frame in FIG. It is the top view which looked at the center frame of FIG. 7 from upper direction. It is a front view of the center frame shown in FIG. FIG. 10 is a left side view of FIG. 9 as seen from the front of the center frame. It is the right view of FIG. 9 which looked at the center frame from back. FIG. 7 is a plan view showing a state in which an engine, a heat exchanger, a hydraulic pump, a hydraulic oil tank, a fuel tank, a control valve, a swing motor, various hoses and the like are mounted on the swing frame of FIG. 6. It is the top view which looked at the turning frame by a 2nd embodiment from the upper part. It is a perspective view which expands and shows the center frame in FIG. It is the top view which looked at the center frame of FIG. 14 from upper direction. FIG. 16 is a front view of the center frame shown in FIG. 15. It is a left view of FIG. 16 which looked at the center frame from the front. It is a right view of FIG. 16 which looked at the center frame from back. It is the perspective view which looked at the turning frame by 3rd Embodiment from diagonally upward. It is a perspective view which expands and shows the center frame in FIG. It is the top view which looked at the center frame of FIG. 20 from upper direction. It is a front view of the center frame shown in FIG. It is the left view of FIG. 22 which looked at the center frame from the front. It is a right view of FIG. 22 which looked at the center frame from the back. It is a top view which shows the state which mounted the engine, the heat exchanger, the hydraulic pump, the hydraulic oil tank, the fuel tank, the control valve, the turning motor, various hoses etc. in the turning frame by 3rd Embodiment.

  Hereinafter, a case where the swing frame of the construction machine according to the embodiment of the present invention is applied to a rear small swing type hydraulic excavator will be described as an example and described in detail with reference to the accompanying drawings.

  Here, FIG. 1 to FIG. 12 show a first embodiment of the present invention. In the figure, 1 is a hydraulic excavator as a construction machine. The hydraulic excavator 1 includes a lower traveling body 2, and an upper revolving body 4 mounted on the lower traveling body 2 so as to be capable of swiveling using a swirling wheel 3. It is comprised by the below-mentioned working device 8 grade | etc.,.

  Further, the upper swing body 4 has a swing frame 11 to be described later. On the swing frame 11, a cab 5, an exterior cover 6, a counterweight 7 and the like are provided as shown in FIG. 5 constitutes an operation operation unit on which an operator gets on and off, and defines a cab inside thereof. The exterior cover 6 together with the counterweight 7 defines a machine room in which an engine 46, a hydraulic pump 47, a heat exchanger 49 and the like which will be described later are accommodated.

  8 is a swing post type working device provided on the front side of the upper swing body 4 so as to be able to move up and down. The working device 8 includes, for example, a swing post 8A, a boom 8B, an arm 8C, a bucket 8D as a working tool, and the like. It has. The swing post 8A of the work device 8 is swingably attached to the left and right with respect to a swing post attaching portion 22 of the turning frame 11 described later using a connecting pin (not shown). As a result, the swing post type working device 8 is swung left and right around the connecting pin, and the boom 8B and the arm 8C are lifted up and down, and the tip side bucket 8D Excavation work (including side ditch) such as earth and sand.

  On the other hand, on the front side of the lower traveling body 2, as shown in FIG. The earth removal plate 9 is used when earth removal work such as earth and sand, leveling work, and the like are performed. Moreover, the earth discharging board 9 is used also as an outrigger for stabilizing a vehicle attitude | position.

  Reference numeral 11 denotes a revolving frame that constitutes the main frame of the upper revolving structure 4. The revolving frame 11 includes a center frame 12, which will be described later, and left and right side frames 30, 31 as shown in FIGS. It is configured.

  Reference numeral 12 denotes a center frame constituting the central portion of the revolving frame 11, and the center frame 12 is formed of a flat plate material as shown in FIGS. 2 to 11, and a bottom plate 13 extending in the front and rear directions, and will be described later. The left and right vertical beams 14 and 15, the swing post mounting portion 22, the upper plate portion 25, the lid plate 27, the weight mounting portion 28, the partition plate 29, and the like.

  The bottom plate 13 of the swivel frame 11 has a number of bolt holes 13A spaced apart from each other in the circumferential direction so as to be concentric with the swivel center O (see FIGS. 6 and 8) as shown in FIGS. , 13A,..., And these bolt holes 13A are provided with a swivel wheel mounting portion for mounting the swivel wheel 3 shown in FIG. 1 between the lower traveling body 2 and a plurality of bolts (not shown). It constitutes.

  As a result, the bottom plate 13 of the turning frame 11 has a central portion in the length direction (front and rear directions) (that is, a turning wheel mounting portion including a large number of bolt holes 13A) on the lower traveling body 2 via the turning wheels 3. It is attached so as to be able to turn and is driven to turn left and right about the turning center O. The bottom plate 13 has a front end portion 13B positioned on the front side of each bolt hole 13A and a rear end portion 13C positioned on the rear side of each bolt hole 13A. The rear end portion 13C is a front end portion. 13B is also formed to be wider in the left and right directions.

  Here, the front end portion 13B of the bottom plate 13 extends in a straight line in the left and right directions as shown in FIGS. 7 and 8, and the front end portion 13B has a lower plate of a swing post mounting portion 22 described later. The part 22B is joined using welding means. On the other hand, the end surface of the rear end portion 13 </ b> C of the bottom plate 13 is formed in an arc shape centering on the turning center O. A weight attaching portion 28 to be described later is provided at the rear end portion 13 </ b> C of the bottom plate 13.

  Reference numerals 14 and 15 denote left and right vertical beams provided on the upper surface side of the bottom plate 13 and extending in the front and rear directions. The vertical beams 14 and 15 are cylinders having a framework structure as shown in FIGS. A swing post mounting portion 22 and a weight mounting portion 28 which will be described later are connected together with the bottom plate 13 by extending along the front and rear directions of the bottom plate 13.

  The left vertical beam 14 of the left and right vertical beams 14 and 15 is formed by using a long cylindrical metal pipe material and extends in the front and rear direction of the bottom plate 13. A plurality of reinforcing pipe portions 17 and 18 made of a short cylindrical metal pipe material disposed in a framework structure (for example, a triangular truss structure or a lattice structure) between the main pipe portion 16 and the bottom plate 13; It is comprised by.

  Here, the main pipe portion 16 is a rear main pipe portion 16A located between a swing post attachment portion 22 and a partition plate 29, which will be described later, and a rear part located between a weight attachment portion 28 and a partition plate 29, which will be described later. It is comprised by the side main pipe part 16B. That is, the front main pipe portion 16A and the rear main pipe portion 16B extend in the front and rear directions of the bottom plate 13 with the partition plate 29 interposed therebetween.

  The rear end of the front main pipe portion 16A and the front end of the rear main pipe portion 16B are integrated at a position sandwiching the partition plate 29. In this case, the front main pipe portion 16A and the rear main pipe portion 16B are configured such that separate pipe members are joined together by welding means or the like before and after the partition plate 29. Further, the front main pipe portion 16A and the rear main pipe portion 16B may be configured by using a pipe material that is formed in advance as an integral object.

  The front main pipe portion 16A has a front end fixed to a boss portion 22A of a swing post mounting portion 22 described later using welding means, and a rear end fixed to a partition plate 29 described later using welding means. Further, the front end of the rear main pipe portion 16B is fixed to the partition plate 29, and extends vertically from the position of the partition plate 29 to the rear. The rear end side of the rear main pipe portion 16B is a rear end bent portion 16C that is bent downward and bent, and the lower end portion of the rear end bent portion 16C is a weight attachment portion described later. 28 is joined by welding means.

  One of the reinforcing pipe portions 17 and 18 is a vertical reinforcing pipe portion (hereinafter referred to as a vertical reinforcing pipe portion) that extends vertically between the bottom plate 13 and the front main pipe portion 16A in the upward and downward directions. These vertical reinforcing pipe portions 17A, 17B, and 17C are provided between the bottom plate 13 and the front main pipe portion 16A as shown in FIG. 7 and FIG. 9 (for example, the pipe portions 17A, 17B, and 17C). A total of three) are arranged at intervals in the front and rear directions.

  Here, among the plurality of vertical reinforcing pipe portions 17A to 17C, the vertical reinforcing pipe portion 17A located on the foremost side is between a lower plate portion 22B of a swing post mounting portion 22 and a front main pipe portion 16A described later. Is provided. And the upper ends of the remaining vertical reinforcing pipe portions 17B and 17C are joined to the front main pipe portion 16A by welding, and the lower ends are joined to the bottom plate 13 by welding.

  The other reinforcing pipe portion 18 is inclined reinforcing pipe portions 18A, 18B, 18C, 18D extending obliquely between the bottom plate 13 and the front main pipe portion 16A, and these inclined reinforcing pipe portions 18A-18D. Are arranged at intervals before and after the vertical reinforcing pipe portions 17A to 17C (for example, a total of four). The inclined reinforcing pipe portions 18A to 18D, together with the vertical reinforcing pipe portions 17A to 17C, constitute a framework that forms a substantially triangular truss structure between the front main pipe portion 16A and the bottom plate 13.

  Of these inclined reinforcing pipe portions 18A to 18D, the inclined reinforcing pipe portion 18A located at the foremost side is inclined obliquely between a boss portion 22A and a lower plate portion 22B of a swing post mounting portion 22 described later. It is joined with. In this case, the inclined reinforcing pipe portion 18A is joined to the boss portion 22A at a position where the upper end side is below the front main pipe portion 16A, and the lower end side extending obliquely downward is joined to the upper surface of the lower plate portion 22B.

  A plurality of (for example, three) inclined reinforcing pipe portions 18B, 18C, and 18D located on the rear side of the inclined reinforcing pipe portion 18A are disposed between the two vertical reinforcing pipe portions 17A and 17B, and the vertical reinforcing pipe portion 17B. , 17C, between the vertical reinforcing pipe portion 17C and the partition plate 29, and both upper and lower ends are joined to the front main pipe portion 16A and the bottom plate 13 by welding.

  Similarly, a vertical reinforcing pipe portion 17D and inclined reinforcing pipe portions 18E and 18F are disposed between the rear main pipe portion 16B and the bottom plate 13. However, the inclined reinforcing pipe portions 18E and 18F are provided so as to be inclined in the direction opposite to the front inclined reinforcing pipe portions 18A to 18D, and the weight attaching portion 28 described later is more effectively reinforced.

  And the inclination reinforcement pipe part 18F located in the back side among the inclination reinforcement pipe parts 18E and 18F is joined in the state inclined diagonally between the below-mentioned weight attachment part 28 and the rear side main pipe part 16B. . In this case, the upper end side of the inclined reinforcing pipe portion 18F is joined to the upper side of the rear end bent portion 16C of the rear main pipe portion 16B, and the lower end side extending obliquely downward is joined to the upper surface of the weight mounting portion 28. Yes.

  On the other hand, of the left and right vertical beams 14 and 15, the right vertical beam 15 is configured in substantially the same manner as the left vertical beam 14 described above, and includes a front main pipe portion 19A, a rear main pipe portion 19B, and a rear end. A main pipe portion 19 made of a bent portion 19C and a plurality of reinforcing pipe portions 20, 21 (more specifically, vertical reinforcing pipe portions 20A, 20B, 20C, 20D and inclined reinforcement) made of a short cylindrical metal pipe material. Pipe portions 21A, 21B, 21C, 21D, 21E, 21F).

  Here, the left and right front main pipe portions 16A and 19A constituting a part of the left and right vertical beams 14 and 15 are separated on both the left and right sides with respect to the turning center O as shown in FIGS. Thus, they are arranged so as to extend in a substantially “C” shape. The left and right front main pipe portions 16A and 19A are joined at the front end side to a swing post mounting portion 22 described later from both the left and right sides, and the rear end side is oblique to the partition plate 29 in the left and right directions. It is joined in a tilted state.

  That is, the left and right front main pipe portions 16A and 19A extend obliquely in a straight line between a swing post mounting portion 22 and a partition plate 29, which will be described later, and the swing post mounting portion 22 and the partition plate 29 In between, it is expanded and arranged in a substantially “C” shape. Thereby, the left and right vertical beams 14 and 15 have a function of increasing the bending rigidity of the revolving frame 11 (particularly, the center frame 12).

  Further, the left and right vertical beams 14 and 15 formed by using the pipe material are formed by swinging the front end sides of the front main pipe portions 16A and 19A, the vertical reinforcing pipe portions 17A and 20A, and the inclined reinforcing pipe portions 18A and 21A, which will be described later. The swivel wheel 3 shown in FIG. 1 is attached to the lower ends of the vertical reinforcing pipe portions 17B to 17C and 20B to 20C and the inclined reinforcing pipe portions 18B to 18D and 21B to 21D. Are joined to the bottom plate 13 by welding in the vicinity of each bolt hole 13A (swivel wheel mounting portion).

  On the other hand, the rear side of the vertical beams 14 and 15 (that is, the rear main pipe portions 16B and 19B, the vertical reinforcing pipe portions 17D and 20D, and the inclined reinforcing pipe portions 18E, 18F, 21E, and 21F) are shown in FIGS. As shown in the figure, it is disposed left and right apart between a partition plate 29 and a weight mounting portion 28, which will be described later, and the lower end side is joined to the rear side of the bottom plate 13 and the rear end bent portions 16C and 19C. The lower end side of each is joined to the weight attaching portion 28.

  Further, the rear main pipe portions 16B and 19B are arranged so that the front end side is joined to the partition plate 29 and the partition plate 29 is sandwiched between the rear ends of the front main pipe portions 16A and 19A from the front and rear directions. ing. Note that the lower end side of the inclined reinforcing pipe portion 21E is joined to the upper surface side of a cylinder mounting portion 38, which will be described later, from obliquely upward as shown in FIG. The upper end side of the inclined reinforcing pipe portion 21F is joined to the upper side of the rear end bent portion 19C of the rear main pipe portion 19B, and the lower end side extending obliquely downward is joined to the upper surface of the weight mounting portion 28. .

  That is, the left and right vertical beams 14 and 15 are joined by welding to the rear end side of the front main pipe portions 16A and 19A with the front ends of the rear main pipe portions 16B and 19C sandwiching the partition plate 29. The rear end bent portions 16C and 19C, the vertical reinforcing pipe portions 17D and 20D, and the inclined reinforcing pipe portions 18F and 21F are joined to the rear mount mounting portion 28 by welding. And the lower end side of vertical reinforcement pipe part 17B-17C, 20B-20C and inclination reinforcement pipe part 18B-18E, 21B-21E is welded with respect to the baseplate 13 in the vicinity of each bolt hole 13A (swivel wheel attachment part). It is joined by.

  Reference numeral 22 denotes a swing post mounting portion provided on the front end side of the bottom plate 13 and the longitudinal beams 14 and 15, and the swing post mounting portion 22 is integrally formed as a cast part using a material such as cast steel. As shown in FIGS. 7 to 10, the swing post mounting portion 22 is constituted by an integral body including a cylindrical boss portion 22 </ b> A that extends upward and downward and a lower plate portion 22 </ b> B.

  Here, the boss portion 22A of the swing post mounting portion 22 has left and right vertical beams 14, 15 (front main pipe portions 16A, 19A, inclined reinforcing pipe portions 18A, 21A) as shown in FIGS. It joins in the state which the front-end side contacted the outer peripheral side. Further, the boss portion 22A of the swing post mounting portion 22 has a pin hole 22C penetrating in the vertical direction, and the above-described connecting pin is rotatably inserted into the pin hole 22C. As a result, the swing post 8A of the working device 8 is connected to the swing post mounting portion 22 so as to be swingable left and right as shown in FIG.

  On the other hand, as shown in FIGS. 7 to 10, the lower plate portion 22B of the swing post mounting portion 22 extends downward from the outer peripheral side of the lower end of the boss portion 22A, and the left and right sides thereof are substantially “C”. It has a shape that spreads out like a letter. And the front-end part 13B of the baseplate 13 is joined to the rear-end part of the lower board part 22B by welding in the abutting state.

  Reference numerals 23 and 24 denote left and right mounting end portions integrally formed on the left and right sides of the lower plate portion 22B of the swing post mounting portion 22. The mounting end portions 23 and 24 are lower plates of the swing post mounting portion 22. It protrudes from the portion 22B in the left and right directions, and front frame portions 30A and 31A of side frames 30 and 31 to be described later are joined in the left and right directions. Thus, the front end sides of the side frames 30 and 31 are connected to the swing post mounting portion 22 via the left and right mounting end portions 23 and 24, respectively.

  Reference numeral 25 denotes an upper plate portion formed using a plate material such as a steel plate. The upper plate portion 25 is opposed to the lower plate portion 22B of the swing post mounting portion 22 at the upper and lower sides, and the front side thereof is a boss portion 22A. It is joined to the upper outer peripheral side. Further, the upper plate portion 25 is formed so that the left and right sides of the upper plate portion 25 have a substantially “C” -shaped divergent shape. The left and right side surfaces of the upper plate portion 25 are joined between the front main pipe portions 16A and 19A using welding means, and the swing post mounting portion 22 is formed on the front end side of the left and right vertical beams 14 and 15. Is to reinforce.

  26 is a seat provided on the upper surface side of the upper plate portion 25. The seat 26 is attached to the upper surface side of the upper plate portion 25 as shown in FIGS. 3, 4, and 9, and the front main pipe portion. It protrudes slightly upward from 16A and 19A. And the receiving seat 26 supports the floor (floor board) side of the cab 5 where an operator gets on and off from below via the cab support plate 39 etc. which are mentioned later.

  Reference numeral 27 denotes a cover plate provided between the lower plate portion 22B and the upper plate portion 25 of the swing post mounting portion 22. The cover plate 27 is a plate material such as a steel plate as shown in FIGS. Is formed as a substantially rectangular lid. The lid plate 27 has both upper and lower ends joined to the lower plate portion 22B and the upper plate portion 25 of the swing post mounting portion 22, and left and right ends joined to the vertical reinforcing pipe portions 17A and 20A. Has been. Thereby, the cover plate 27 reinforces the swing post mounting portion 22 together with the front main pipe portions 16A and 19A, the vertical reinforcing pipe portions 17A and 20A, and the upper plate portion 25 on the front end side of the left and right vertical beams 14 and 15. Is.

  That is, the cover plate 27 is located between the front portions of the left and right vertical beams 14 and 15 (the front main pipe portions 16A and 19A, the vertical reinforcing pipe portions 17A and 20A, the upper plate portion 25) and the swing post mounting portion 22. This increases the bonding strength, bending strength, etc., and forms the front side of the center frame 12 in a sturdy structure. A circular opening 27A is formed at the center of the lid plate 27, and a hydraulic hose 53A (see FIG. 1) for supplying and discharging pressure oil to the working device 8 (see FIG. 1) side is formed in the opening 27A. 12) is inserted.

  Reference numeral 28 denotes a weight mounting portion provided at the rear end portion 13C of the bottom plate 13. The weight mounting portion 28 is a rear end portion of the bottom plate 13 made of a plate material such as a steel plate extending in the left and right directions as shown in FIGS. It is configured by being fixed to 13C by welding means or the like. Here, the rear end surface of the weight attachment portion 28 is formed in an arc shape with the turning center O as the center, like the rear end portion 13 </ b> C of the bottom plate 13. A counterweight 7 shown in FIG. 1 is detachably attached to the weight attaching portion 28 using a bolt or the like.

  Reference numeral 29 denotes a partition plate extending in the left and right directions of the bottom plate 13, and the partition plate 29 is formed by using, for example, a steel plate thinner than the bottom plate 13 as shown in FIGS. 2 to 12. It is erected on the bottom plate 13 between the front main pipe portions 16A and 19A and the rear main pipe portions 16B and 19B. The lower end surface of the partition plate 29 is joined to the upper surface of the bottom plate 13 using welding means, and the rear ends of the front main pipe portions 16A and 19A and the rear main pipe portion are arranged on the upper side of the partition plate 29. The front ends of 16B and 19B are joined using welding means.

  Here, the partition plate 29 connects the left and right main pipe portions 16 and 19 to each other on the bottom plate 13, and between the lower end of the partition plate 29 and the upper surface of the bottom plate 13, the inclined reinforcing pipe portion 18 </ b> D, The lower end sides of 18E, 21D, and 21E are joined obliquely. Note that the lower end side of the inclined reinforcing pipe portion 21E is obliquely joined to the upper surface side of a cylinder mounting portion 38, which will be described later, as shown in FIG. And the partition plate 29 is arrange | positioned in the position which becomes the front side rather than the weight attachment part 28 in the rear part side of the turning wheel attachment part which consists of many bolt holes 13A, as shown in FIG.

  Thereby, on the rear side of the partition plate 29, a machine room for accommodating an engine 46, a hydraulic pump 47, an exhaust gas aftertreatment device 48, a heat exchanger 49, and the like, which will be described later, is defined between the weight mounting portion 28. Made. And the partition plate 29 suppresses that the noise, heat, etc. from the engine 46 leak to the outer side (cab 5 side) of a machine room, for example. The partition plate 29 has a function of increasing the bending strength of the revolving frame 11 (particularly, the bottom plate 13) by extending across the bottom plate 13 in the left and right directions.

  Reference numerals 30 and 31 denote left and right side frames (hereinafter referred to as a left side frame 30 and a right side frame 31) constituting a part of the turning frame 11, and the left side frame 30 and the right side frame 31 are crossed, for example. A cylindrical hollow frame material having a D-shaped, quadrangular, triangular, circular or elliptical surface is bent into an arc shape with reference to the turning center O (see FIG. 6) as shown in FIGS. It is formed by processing.

  Here, the left side frame 30 includes a front frame portion 30A extending linearly in the left and right directions, and a joint frame 30B on one side (the left and right outer end portions) of the front frame portion 30A. The bent frame portion 30 </ b> C is connected and the rear side is formed to be curved in an arc shape with respect to the turning center O shown in FIG. 6. The front frame portion 30A of the left side frame 30 is fixed by joining the left and right inner end portions to the mounting end portion 23 located on the left side of the swing post mounting portion 22 as shown in FIGS. The rear end side of the bending frame portion 30C is connected to the rear end side of the bottom plate 13 using a connection fitting 32 or the like.

  Further, the middle portion of the bending frame portion 30C in the length direction is connected to the middle portion in the length direction of the bottom plate 13 through a protruding beam 34 and the like which will be described later. The left side frame 30 supports the cab 5 from below via a cab support plate 39 which will be described later, and the joint portion 30B side of the left side frame 30 is a bent frame portion for expanding the living space in the cab 5. It protrudes radially outward from the arc formed by the rear side of 30C.

  On the other hand, the right side frame 31 has a short front frame portion 31A extending linearly in the left and right directions, and a joint portion 31B on one side (the left and right outer end portions) of the front frame portion 31A. And a bending frame portion 31C that is curved in an arc shape with reference to the turning center O shown in FIG.

  The front frame portion 31A of the right side frame 31 is fixed by joining its inner end portion to the attachment end portion 24 located on the right side of the swing post attachment portion 22, and the rear end side of the bending frame portion 31C is connected. The bottom plate 13 is connected to the rear end side using a metal fitting 33 or the like. In addition, a midway portion in the length direction of the bending frame portion 31C is connected to a middle portion in the length direction of the bottom plate 13 via a protruding beam 35 and the like which will be described later.

  Reference numeral 34 denotes an extended beam for connecting the left side frame 30 to the center frame 12. The extended beam 34 is joined to the bottom plate 13 of the center frame 12 at the base end side, and the bent side of the left side frame 30 at the distal end side. It is joined to 30C. The overhanging beam 34 is provided integrally or separately on the lower end side of the partition plate 29. The overhanging beam 34 increases the joining strength of the left side frame 30 to the center frame 12 together with the partition plate 29.

  Reference numeral 35 denotes an extended beam for connecting the right side frame 31 to the center frame 12. The extended beam 35 is joined to the bottom plate 13 of the center frame 12 at the base end side, and the bending frame portion of the right side frame 31 at the distal end side. It is joined to 31C. The overhanging beam 35 increases the bonding strength of the right side frame 31 with respect to the center frame 12.

  Reference numerals 36 and 37 denote mounting plates provided between the front longitudinal beam 17 of the center frame 12 and the right side frame 31. The mounting plates 36 and 37 are made of a plate material such as a steel plate, for example, as shown in FIG. The base end side of the center frame 12 is joined to the outer peripheral surface of the front main pipe portion 19 at a position spaced upward from the bottom plate 13 of the center frame 12. Further, the distal end sides of the mounting plates 36 and 37 are joined to the bending frame portion 31C of the right side frame 31 at a position lower than the above-described proximal end side.

  Here, the mounting plates 36 and 37 are disposed in front of and behind the overhanging beam 35 and support a hydraulic oil tank 44 and a fuel tank 45 (see FIG. 12), which will be described later, from below. A swing cylinder 42 described later is disposed with a gap between the crank-shaped mounting plate 36 and the front frame portion 31 </ b> A of the right side frame 31.

  A heat exchanger 49 (described later) is mounted on the mounting plate 37 located on the rear side of the overhanging beam 35 from the upper side at a position on the rear side of the hydraulic oil tank 44. As shown in FIG. 4, the mounting plate 37 is disposed at a position that covers a cylinder mounting portion 38 (described later) from above, and the bottom side of a swing cylinder 42 (described later) rotates between the mounting plate 37 and the cylinder mounting portion 38. It is pinned so as to be movable.

  Reference numeral 38 denotes a cylinder mounting portion provided on the bottom plate 13 at a position outside the rear main pipe portion 19B. The cylinder mounting portion 38 has a substantially U-shaped planar shape as shown in FIGS. It is formed as a block body and is fixed to the upper surface side of the bottom plate 13 using welding means or the like. And the bottom side of the swing cylinder 42 mentioned later is connected with the cylinder attaching part 38 so that rotation is possible via a connection pin (not shown). Further, the mounting plate 37 has a function of restricting the bottom side of the swing cylinder 42 from coming out from the upper end of the connecting pin by covering the cylinder mounting portion 38 from above as shown in FIG.

  Reference numeral 39 denotes a cab support plate provided on the front frame portion 30A of the left side frame 30 via leg plates 40, 41. The cab support plate 39 includes the left and right front main pipe portions 16A, 16A, as shown in FIG. 19A and leg plates 40 and 41 extend leftward and rightward, and are supported from the lower side by a seat 26 on the upper plate portion 25 of the swing post mounting portion 22. The cab support plate 39 supports the floor (floor plate) side of the cab 5 shown in FIG. 1 from the lower side together with the cab support plate (not shown) on the partition plate 29 side.

  A swing cylinder 42 swings the entire working device 8 left and right around the connecting pin. The swing cylinder 42 has a rod 42A that expands and contracts forward and backward by the supply and discharge of pressure oil. As shown in FIG. 1, the swing post 8 </ b> A of the working device 8 is pin-coupled to the front end side of the working device 8 via a pin 43. Further, the bottom side of the swing cylinder 42 is pin-coupled between the attachment plate 37 and the cylinder attachment portion 38 shown in FIG. The swing cylinder 42 swings the entire working device 8 left and right around the connecting pin by expanding and contracting the rod 42A.

  A hydraulic oil tank 44 is disposed above the swing cylinder 42. The hydraulic oil tank 44 is mounted on the revolving frame 11 via mounting plates 36 and 37 shown in FIG. 3, and as shown in FIG. It arrange | positions at the front side of the heat exchanger 49 mentioned later. The hydraulic oil tank 44 stores hydraulic oil supplied to the suction side of a hydraulic pump 47 described later.

  Reference numeral 45 denotes a fuel tank disposed on the right side of the hydraulic oil tank 44. The fuel tank 45 stores fuel to be supplied to an engine 46 described later. The fuel tank 45 is mounted on the revolving frame 11 together with the hydraulic oil tank 44 via the mounting plates 36 and 37 shown in FIG. 3, and between the hydraulic oil tank 44 and the right side frame 31 as shown in FIG. Is arranged.

  Reference numeral 46 denotes an engine as a prime mover mounted on the rear side of the revolving frame 11. The engine 46 is disposed on the revolving frame 11 on the rear side of the partition plate 29 so as to extend leftward and rightward. Yes. A hydraulic pump 47 that discharges pressure oil toward actuators such as the lower traveling body 2 and the work device 8 is attached to one side in the length direction of the engine 46 (left side position in FIG. 12). Further, an exhaust gas after-treatment device 48 such as a silencer and an exhaust gas purification device is disposed above the hydraulic pump 47 and located on the distal end side of the exhaust pipe 46A.

  On the other hand, on the other side in the length direction of the engine 46 (right side position in FIG. 12), a heat exchanger 49 including a radiator, an oil cooler, and the like is disposed. The heat exchanger 49 is shown in FIGS. It is fixedly provided on the upper side of the mounting plate 37 shown. The heat exchanger 49 cools the cooling water of the engine 46, the hydraulic oil, and the like.

  Reference numeral 50 denotes a turning motor as a hydraulic device provided near the center of the bottom plate 13 of the turning frame 11, and the turning motor 50 serves as a drive source for the turning device 3 described above. The turning motor 50 is located between the left and right vertical beams 14 and 15 and is mounted together with a turning speed reducer (not shown) on the upper surface side of the bottom plate. Further, as shown in FIG. 12, a center joint 51 as a rotary joint is provided on the center side (in the vicinity of the turning center O shown in FIG. 6) of the turning wheel mounting portion including a large number of bolt holes 13A.

  Reference numeral 52 denotes a control valve as a hydraulic device mounted on the revolving frame 11 located between the left vertical beam 14 and the left side frame 30. The control valve 52 is constituted by a multiple valve formed by superposing a plurality of directional control valves. In addition, a plurality of hydraulic hoses 53 are connected to the control valve 52 between, for example, the turning motor 50, the center joint 51, and the work device 8 side. Among them, the plurality of hydraulic hoses 53A extending toward the working device 8 side are on the boom 8B side from the front end side (the swing post mounting portion 22 side shown in FIG. 6) of the center frame 12 via the swing post 8A of the working device 8. Led to.

  A discharge pipe 54 is provided between the hydraulic pump 47 and the control valve 52 to supply the pressure oil discharged from the hydraulic pump 47 to each of the hydraulic actuators described above via the control valve 52. Further, a return pipe 55 is provided between the control valve 52 and the hydraulic oil tank 44 for returning the return oil returned from each hydraulic actuator to the hydraulic oil tank 44 via the control valve 52.

  The hydraulic excavator 1 of the rear small turning type according to the present embodiment has the above-described configuration. Next, the assembly work of the turning frame 11 will be described.

  First, in the assembly process of the center frame 12, the bottom plate 13 formed in a shape extending forward and backward from a thick steel plate or the like as shown in FIGS. The beams 14 and 15 are welded together with the swing post mounting portion 22, and a weight mounting portion 28 made of a thick plate material is welded to the rear end portion 13C of the bottom plate 13.

  The front main pipe portions 16A, 19A of the longitudinal beams 14, 15 are joined to the boss portion 22A of the swing post mounting portion 22 by fillet welding or the like from the left and right sides. In this case, the swing post mounting portion 22 to which the swing post 8A of the working device 8 is pin-coupled is integrally formed in advance as a cast steel part including a cylindrical boss portion 22A and a lower plate portion 22B.

  Then, the front end portion 13B of the bottom plate 13 is butt welded to the front end side of the lower plate portion 22B extending rearward from the boss portion 22A as shown in FIG. Further, on both the left and right sides of the lower plate portion 22B, vertical reinforcing pipe portions 17A and 20A are provided between the front main pipe portions 16A and 19A, and between the boss portion 22A and the lower plate portion 22B. Are provided by joining the inclined reinforcing pipe portions 18A and 21A.

  Further, between the boss portion 22A of the swing post mounting portion 22 and the left and right front main pipe portions 16A and 19A, an upper plate portion 25 having a substantially triangular or trapezoidal shape is used by means such as fillet welding. Join. The lid plate 27 has both upper and lower ends joined to the lower plate portion 22B and the upper plate portion 25 of the swing post mounting portion 22, and left and right vertical reinforcement pipe portions 17A at the left and right ends. , 20A. Thereby, on the front end side of the left and right vertical beams 14, 15, the front main pipe portions 16A, 19A, the vertical reinforcing pipe portions 17A, 20A, the inclined reinforcing pipe portions 18A, 21A, the upper plate portion 25, the cover plate 27, and the like. The swing post mounting portion 22 is reinforced using

  On the other hand, between the bottom plate 13 and the front main pipe portion 16A, other vertical reinforcement pipe portions 17 (for example, vertical reinforcement pipe portions 17B and 17C) are welded with a space from the vertical reinforcement pipe portion 17A to the rear side. Provide. Further, between the bottom plate 13 and the front main pipe portion 16A, for example, an inclined reinforcing pipe portion 18B is provided by welding between the two vertical reinforcing pipe portions 17A and 17B, and the vertical reinforcing pipe portions 17B and 17C are provided. An inclined reinforcing pipe portion 18C is provided therebetween, and an inclined reinforcing pipe portion 18D is provided between the vertical reinforcing pipe portion 17C and the partition plate 29 by welding.

  The right vertical beam 15 is also provided with a plurality of vertical reinforcing pipe portions 20 and a plurality of inclined reinforcing pipe portions 21 in the same manner as the left vertical beam 14. That is, between the bottom plate 13 and the front main pipe portion 19A, for example, vertical reinforcing pipe portions 20B and 20C are welded, and the inclined reinforcing pipe portions 21B, 21C, and 21D are welded with a gap between the front and rear. Provide.

  A partition plate 29 extending across the bottom plate 13 in the left and right directions at a position closer to the rear side of the swivel wheel mounting portion formed of a large number of bolt holes 13A provided in the bottom plate 13 of the center frame 12. The left and right rear main pipe portions 16B and 19B are welded together with the left and right front main pipe portions 16A and 19A on the bottom plate 13 so that the partition plate 29 is sandwiched between the front and the rear. Provide. The rear end bent portions 16C and 19C of the rear main pipe portions 16B and 19B are provided with their lower end portions joined to the weight mounting portion 28.

  Further, between the weight attaching portion 28 and the partition plate 29, the vertical reinforcing pipe portion 17D and the inclined reinforcing pipe portions 18E and 18F are welded so as to form a framework structure between the rear main pipe portion 16B and the bottom plate 13. Provide. Similarly, the vertical reinforcing pipe portion 20D and the inclined reinforcing pipe portions 21E and 21F are also provided between the rear main pipe portion 19B and the bottom plate 13 by welding.

  Next, on the left and right sides of the center frame 12 assembled in this way, as shown in FIGS. 2 to 6, a left side frame 30 and a right side frame 31 are connected to metal fittings 32 and 33, and an extended beam 34. , 35 and the like by welding means.

  In this case, the left side frame 30 joins and fixes the inner end portion of the front frame portion 30A to the attachment end portion 23 of the swing post attachment portion 22, and the rear end side of the bending frame portion 30C via the connection fitting 32. The bottom plate 13 is connected to the rear end side. Further, the midway portion in the length direction of the bending frame portion 30C is integrally joined to the middle portion in the length direction of the bottom plate 13 via a protruding beam 34 or the like as shown in FIG.

  Further, the right side frame 31 is joined by fixing the inner end portion of the front frame portion 31A to the attachment end portion 24 of the swing post attaching portion 22 and the rear end side of the bent frame portion 31C is connected to the bottom plate via the connecting metal fitting 33. 13 is connected to the rear end side. Further, the intermediate portion in the length direction of the bending frame portion 31C is integrally joined to the bottom plate 13, the main pipe portion 19 and the like via the overhanging beam 35 and the mounting plates 36 and 37 as shown in FIGS. .

  A mounting plate 37 located on the rear side of the overhanging beam 35 is provided by welding or the like between the rear main pipe portion 19B of the center frame 12 and the bending frame portion 31C of the right side frame 31, and is shown in FIG. As illustrated in FIGS. 4 to 6, the planar shape of the heat exchanger bracket that supports the illustrated heat exchanger 49 from the lower side is disposed so as to be substantially L-shaped.

  In addition, a cylinder mounting portion 38 that is welded to the upper surface of the rear portion of the bottom plate 13 is disposed below the mounting plate 37, and a swing cylinder 42 ( The bottom side of Fig. 12) is sandwiched from above and below. And when attaching the bottom side of the swing cylinder 42 with respect to the cylinder attachment part 38 of the turning frame 11, in the state which aligned the cylinder attachment part 38 and the pin hole (not shown) by the side of the swing cylinder 42, A connecting pin (not shown) for the swing cylinder 42 can be inserted from below the bottom plate 13.

  Next, the operation of the rear small turning type hydraulic excavator 1 including the turning frame 11 assembled as described above will be described with reference to FIGS.

  First, when the hydraulic pump 47 is driven by the engine 46 housed in the exterior cover 6 at the lower rear side of the cab 5, the pressure oil discharged from the hydraulic pump 47 is a traveling motor (not shown) for the lower traveling body 2. As a result, the hydraulic excavator 1 (vehicle) can be driven to move forward or backward.

  When excavation work such as earth and sand is performed, the hydraulic oil from the hydraulic pump 47 is supplied to and discharged from each hydraulic cylinder or the like of the working device 8 so that the boom 8B and the arm 8C are raised and lowered with respect to the swing post 8A. While moving, the bucket 8D is rotated to excavate earth and sand.

  Further, when performing, for example, a side ditching operation using the working device 8, the connecting pin is connected to the swing post mounting portion 22 of the swivel frame 11 by expanding and contracting the rod 42A of the swing cylinder 42 by supplying and discharging pressure oil. As a result, the swing post 8A is swung horizontally (left and right), and the entire work device 8 is swung left and right with respect to the revolving frame 11.

  By the way, the left and right vertical beams 14 and 15 provided on the bottom plate 13 of the center frame 12 are subjected to a bending load received by the swing post mounting portion 22 from the work device 8 side due to excavation work or the like by the work device 8. It is received together with the bottom plate 13. For this reason, when the left and right vertical beams 14 and 15 are formed of a highly rigid thick plate material (left and right vertical plates) as in the prior art, the left and right vertical plates are heavy. This is an obstacle to reducing the size and weight of construction machinery.

  Therefore, in the present embodiment, the left and right vertical beams 14 and 15 provided on the bottom plate 13 of the center frame 12 are formed using a long cylindrical metal pipe material in front of the bottom plate 13, A left main pipe portion 16 extending in the rearward direction, a right main pipe portion 19, and a framework structure (for example, a triangular truss structure or a lattice structure) are formed between the main pipe portions 16, 19 and the bottom plate 13. The plurality of left reinforcing pipe portions 17 and 18 and the right reinforcing pipe portions 20 and 21 made of a short cylindrical metal pipe material are arranged.

  Accordingly, the left and right vertical beams 14 and 15 extending in the front and rear directions on the upper side of the bottom plate 13 can be formed by using, for example, a cylindrical pipe material having a triangular truss structure or a lattice structure. It is possible to secure sufficient strength as the beams 14 and 15 and to reduce the weight. Then, the pipe material forming the framework structure is disposed so as to extend forward and rearward on the upper side of the bottom plate 13, thereby connecting the front swing post mounting portion 22 and the rear weight mounting portion 28 together with the bottom plate 13. Thus, the front swing post mounting portion 22 and the rear weight mounting portion 28 can be firmly supported with sufficient strength.

  A partition plate 29 extending across the bottom plate 13 in the left and right directions at a position closer to the rear side of the swivel wheel mounting portion formed of a large number of bolt holes 13A provided in the bottom plate 13 of the center frame 12. For example, the engine 46, the hydraulic pump 47, the exhaust gas aftertreatment device 48, the heat exchanger 49, and the like are accommodated at the rear side of the swivel wheel mounting portion and the weight mounting portion 28. The machine room for this purpose can be defined by being cut off from the cab 5 side by the partition plate 29.

  Thereby, the partition plate 29 can suppress, for example, noise, heat and the like from the engine 46 from leaking to the outside (cab 5 side) of the machine room. Further, since the left and right vertical beams 14 and 15 made of pipe material are configured to extend forward and rearward with the partition plate 29 interposed therebetween, a partition plate 29 extending left and right on the bottom plate 13 is provided. The bending strength and the like of the revolving frame 11 (particularly, the bottom plate 13) can be increased by the left and right vertical beams 14 and 15 extending in the front and rear directions across the partition plate 29, and a large number of bolts. It is possible to increase the strength in the vicinity of the swivel wheel mounting portion including the hole 13A.

  Further, the left and right vertical beams 14 and 15 formed using the pipe material swing the front end side of the front main pipe portions 16A and 19A, the vertical reinforcing pipe portions 17A and 20A, and the inclined reinforcing pipe portions 18A and 21A. The swivel wheel 3 shown in FIG. 1 is attached to the lower ends of the vertical reinforcing pipe portions 17B to 17C and 20B to 20C and the inclined reinforcing pipe portions 18B to 18D and 21B to 21D. Are joined to the bottom plate 13 by welding in the vicinity of each bolt hole 13A (swivel wheel mounting portion).

  Thereby, between the position near the swivel wheel mounting portion made up of each bolt hole 13A in the bottom plate 13 and the swing post mounting portion 22, the left and right vertical beams 14 and 15 formed by using the pipe material are strengthened. Both the position near the swivel wheel mounting portion and the swing post mounting portion 22 are increased in strength by the front main pipe portions 16A and 19A and the plurality of reinforcing pipe portions 17, 18, 20, 21 and the like. be able to.

  The left and right vertical beams 14 and 15 are joined by welding the front ends of the rear main pipe portions 16B and 19B to the rear end sides of the front main pipe portions 16A and 19A with the partition plate 29 interposed therebetween. The rear end bent portions 16C and 19C, the vertical reinforcing pipe portions 17D and 20D, and the inclined reinforcing pipe portions 18F and 21F are joined to the rear mount mounting portion 28 by welding. Moreover, the lower ends of the vertical reinforcing pipe portions 17B to 17C and 20B to 20C and the inclined reinforcing pipe portions 18B to 18E and 21B to 21E are welded to the bottom plate 13 at positions near the respective bolt holes 13A (swivel wheel mounting portions). It is joined by.

  As a result, the left and right vertical beams 14 and 15 (for example, the rear plates) formed by using the pipe material between the position near the swivel wheel mounting portion including the bolt holes 13A and the weight mounting portion 28 in the bottom plate 13 are formed. Side main pipe portions 16B, 19B, etc.) via a partition plate 29, etc., and both the position near the swivel wheel mounting portion and the weight mounting portion 28 are connected to the rear main pipe portions 16B, 19B, The strength can be increased by the plurality of reinforcing pipe portions 17, 18, 20, 21 and the partition plate 29.

  Moreover, the left and right vertical beams 14 and 15 include left and right main pipe parts 16 and 19 made of a long pipe material, left reinforcing pipe parts 17 and 18 made of a short pipe material, and a right side reinforcement. Since it is constituted by the pipe parts 20 and 21, the bottom plate 13 and the main pipe parts 16 and 19 can be connected by forming a framework structure by these reinforcing pipe parts 17, 18, 20, and 21, The main pipe portions 16 and 19 can be firmly supported on the bottom plate 13.

  Then, the front swing post mounting portion 22 and the rear weight mounting portion 28 are connected to the bottom plate by the main pipe portions 16, 19 made of a pipe material having a framework structure and the plurality of reinforcing pipe portions 17, 18, 20, 21. 13, and the front swing post mounting portion 22 and the rear weight mounting portion 28 can be supported with sufficient strength.

  Further, the left and right vertical beams 14 and 15 are formed of a hollow cylindrical pipe material to form a frame structure, thereby forming a pipe material formed between the main pipe portion 16 and the reinforcing pipe portions 17 and 18. The space between the pipe members formed between the main pipe portion 19 and the reinforcing pipe portions 20 and 21 can be utilized as insertion holes for the hydraulic hose 53, the return pipe 55 (see FIG. 12), and the like. This eliminates the need for specially drilled holes for hydraulic hoses and hydraulic piping.

  Even if the hydraulic hose 53, the return pipe 55, etc. in this case come into contact with the pipe material such as the main pipe part 16, the reinforcing pipe parts 17, 18, and the main pipe part 19, the reinforcing pipe parts 20, 21, etc. The use of a simple pipe material prevents wear and damage to the hydraulic hose 53, return pipe 55, etc., eliminating the need for protective members to protect the hydraulic hose as in the prior art and reducing the number of parts. Thus, the workability during assembly can be improved.

  The left and right main pipe portions 16 and 19 include front main pipe portions 16A and 19A and rear main pipe portions 16B and 19B. The front ends of the front main pipe portions 16A and 19A are connected to the swing post mounting portion 22. The rear end portions of the rear main pipe portions 16B and 19B are provided by being joined to the boss portion 22A, and are bent downward and bent to become rear end bent portions 16C and 19C, and the rear end bent portions 16C and 19C. The lower end portion is joined to the weight attaching portion 28 and provided.

  The rear main pipe portions 16B and 19B are disposed so that the front end side is joined to the partition plate 29 and the partition plate 29 is sandwiched between the rear ends of the front main pipe portions 16A and 19A from the front and rear directions. ing. For this reason, the front swing post mounting portion 22 and the rear weight mounting portion 28 are connected to the bottom plate by the front main pipe portions 16A, 19A and the rear main pipe portions 16B, 19B with the partition plate 29 interposed therebetween. 13, the swing post mounting portion 22, the vicinity of the swivel wheel mounting portion and the weight mounting portion 28 are connected to the front main pipe portions 16 A and 19 A, the rear main pipe portions 16 B and 19 B, and a plurality of The strength can be increased by the reinforcing pipe portions 17, 18, 20, 21 and the like.

  Therefore, according to the first embodiment, the center frame 12 of the revolving frame 11 can be formed into a sturdy structure by forming the left and right vertical beams 14 and 15 using the pipe material having a frame structure. In addition, sufficient strength as a frame can be secured, and the center frame 12 can be reduced in weight.

  In addition, by forming the left and right vertical beams 14 and 15 using a hollow cylindrical pipe material, for example, there is no need to provide a special drilling hole or the like for the hydraulic hose 53, and the hydraulic hose 53. It is also possible to eliminate the need for a protective member for protecting the like. Thereby, workability | operativity at the time of assembling the revolving frame 11 by reducing the number of parts can be improved, and workability | operativity etc. at the time of a maintenance can also be improved.

  Next, FIGS. 13 to 18 show a second embodiment of the present invention. In this embodiment, the same reference numerals are given to the same components as those of the first embodiment described above, and the description thereof will be given. Shall be omitted.

  However, the feature of the second embodiment is that the inclined reinforcing pipe portion among the plurality of reinforcing pipe portions 61, 62, 63, 64 constituting the left and right vertical beams 14, 15 together with the main pipe portions 16, 19 is provided. 62, 64 (that is, the inclined reinforcing pipe portion 62 located between the front side of the swivel wheel mounting portion and the swing post mounting portion 22 formed of a large number of bolt holes 13A provided in the bottom plate 13 of the center frame 12. , 64) is joined to the upper surface of the bottom plate 13 in a state where the lower end side thereof is inclined obliquely so as to project to the left and right of the bottom plate 13.

  Here, among the plurality of reinforcing pipe portions 61 to 64, the vertical reinforcing pipe portions 61 and 63 which are vertically provided between the bottom plate 13 and the main pipe portions 16 and 19 are the same as those in the first embodiment. It is comprised similarly to the vertical reinforcement pipe part 17 and 20 described. That is, among the plurality of vertical reinforcing pipe portions 61 and 63 (61A to 61D and 63A to 63D), the vertical reinforcing pipe portions 61A and 63A located at the foremost side are the lower plate portion 22B and the front side of the swing post mounting portion 22. It is provided between the main pipe portions 16A and 19A. The remaining vertical reinforcing pipe portions 61B to 61D and 63B to 63D have upper ends joined to the main pipe portions 16 and 19 by welding, and lower ends joined to the bottom plate 13 by welding.

  The lower plate portion of the swing post mounting portion 22 among the plurality of inclined reinforcing pipe portions 62 extending obliquely between the left main pipe portion 16 and the bottom plate 13, the lower plate portion 22B, and the weight mounting portion 28. The inclined reinforcing pipe portion 62A provided on 22B is welded at its upper end side to the left front main pipe portion 16A by welding, similarly to the inclined reinforcing pipe portion 18A described in the first embodiment, and the lower end side is the front side. The upper plate 22B is joined to the upper surface of the lower plate portion 22B by welding while being inclined obliquely in the rearward direction.

  Further, the inclined reinforcing pipe portions 62E, 62F, and 62G located between the rear side of the swivel wheel attaching portion including the bolt holes 13A and the weight attaching portion 28 are the inclined reinforcing pipes described in the first embodiment. Similarly to the portions 18D, 18E, and 18F, the upper end side thereof is joined to the left rear main pipe portion 16B by welding, and the lower end side is inclined forward and rearward with the bottom plate 13 and the weight mounting portion 28 being inclined. It is joined to the upper surface by welding.

  However, among the plurality of inclined reinforcing pipe portions 62, the inclined reinforcing pipe portions 62B, 62C, and 62D positioned between the front side of the swivel wheel attaching portion including the bolt holes 13A and the swing post attaching portion 22 are: The bottom plate 13 is joined to the front main pipe portion 16A by welding, and the bottom plate 13 is tilted obliquely forward, rearward, leftward, and rightward so that the lower end protrudes to the left and right of the bottom plate 13. It is joined to the upper surface by welding.

  A plurality of inclined reinforcing pipe portions 64 provided between the right main pipe portion 19 and the bottom plate 13, the lower plate portion 22B, and the weight attaching portion 28 are also provided on the lower plate portion 22B of the swing post attaching portion 22. The inclined reinforcing pipe portion 64A, like the inclined reinforcing pipe portion 21A described in the first embodiment, has an upper end side joined to the right front main pipe portion 19A by welding, and a lower end side in the front and rear directions. It is joined by welding to the upper surface of the lower plate portion 22B in an inclined state.

  Further, the inclined reinforcing pipe portions 64E, 64F, and 64G located between the rear side of the swivel wheel attaching portion (many bolt holes 13A) and the weight attaching portion 28 are provided with the inclined reinforcement described in the first embodiment. As with the pipe portions 21D, 21E, and 21F, the upper end side is joined to the right rear main pipe portion 19B by welding, and the lower end side is inclined obliquely forward and backward, and the bottom plate 13 and the weight attachment portion 28 are connected. It is joined to the upper surface by welding.

  However, among the plurality of inclined reinforcing pipe portions 64, the inclined reinforcing pipe portions 64B, 64C, and 64D positioned between the front side of the swivel wheel attaching portion (the numerous bolt holes 13A) and the swing post attaching portion 22 are used. The upper end side is joined to the front main pipe portion 19A by welding, and the lower end side is inclined obliquely in the front, rear direction, left and right directions so as to project to the left and right directions of the bottom plate 13. Thus, the upper surface of the bottom plate 13 is joined by welding.

  Here, among the inclined reinforcing pipe portions 62B, 62C, 62D, 64B, 64C, and 64D, the inclined reinforcing pipe portions 62B, 62D, 64B, and 64D are in the left and right directions from the left and right front main pipe portions 16A and 19A. It is inclined and arranged so as to project outward. In contrast to this, the inclined reinforcing pipe portions 62C and 64C are disposed obliquely so as to project inward in the left and right directions from the left and right front main pipe portions 16A and 19A. .

  Further, the lower ends of the inclined reinforcing pipe portions 62B, 62C, 62D, 64B, 64C, and 64D are the left and right of the large number of bolt holes 13A constituting the swivel wheel mounting portion as shown in FIGS. The front main pipe portions 16A and 19A are joined to the upper surface of the bottom plate 13 in the vicinity of the bolt holes 13A located obliquely below, and the left and right front main pipe portions 16A and 19A are stabilized on the bottom plate 13. It is something to support.

  As a result, the inclined reinforcing pipe portions 62B, 62C, 62D, 64B, 64C, and 64D are located between the swivel wheel mounting portion and the swing post mounting portion 22 formed of a large number of bolt holes 13A provided in the bottom plate 13 of the center frame 12. In addition, it has a function of increasing bending rigidity, torsional rigidity, and the like with respect to external forces between the front side of the bottom plate 13 and the left and right front main pipe parts 16A and 19A.

  Thus, in the second embodiment configured as described above, it is possible to obtain substantially the same operational effects as those in the first embodiment. However, in the present embodiment, the inclined reinforcing pipe portions 62 and 64 positioned between the front side of the swivel wheel mounting portion made up of a large number of bolt holes 13 </ b> A and the swing post mounting portion 22, the lower end side of the bottom plate 13. It is configured to be joined to the upper surface of the bottom plate 13 in an inclined state so as to project in the left and right directions.

  For this reason, for example, even when an external force due to the excavation reaction force or the like from the working device 8 acts as a torsional load on the left and right vertical beams 14 and 15 via the swing post mounting portion 22, the bottom plate 13 and the left and right front sides The bending rigidity and torsional rigidity of the center frame 12 can be effectively improved by the plurality of inclined reinforcing pipe parts 62 and 64 arranged so as to project left and right between the main pipe parts 16A and 19A. The strength of the turning frame 11 can be increased efficiently.

  Next, FIGS. 19 to 25 show a third embodiment of the present invention. In this embodiment, the same reference numerals are given to the same components as those of the first embodiment described above, and the description thereof will be given. Shall be omitted. However, a feature of the third embodiment is that a connecting pipe portion 71 is connected between the left and right vertical beams 14 and 15 at least in the left and right directions.

  Here, the connecting pipe portion 71 includes a connecting horizontal pipe portion 72 that connects the left and right front main pipe portions 16A and 19A in the left and right directions (lateral direction), and the length of the connecting horizontal pipe portion 72. It is constituted by connecting inclined pipe portions 73, 74, 75, 76 provided obliquely between the middle portion in the vertical direction (left and right direction) and the left and right front main pipe portions 16A, 19A. ing.

  The connecting horizontal pipe portion 72 and the connecting inclined pipe portions 73 to 76 include the front side of the swivel wheel mounting portion formed of a large number of bolt holes 13 </ b> A provided in the bottom plate 13 of the center frame 12 and the swing post mounting portion 22. In order to reinforce the lengthwise intermediate portions of the front main pipe portions 16A and 19A located between the front main pipe portions 16A and 19A, the lengthwise intermediate portions of the front main pipe portions 16A and 19A are connected to form a framework structure in the left and right directions. Is.

  That is, of the connecting inclined pipe portions 73 to 76, the connecting inclined pipe portions 73 and 74 located on the front side of the connecting horizontal pipe portion 72 are located on the left and right sides of the intermediate portion in the longitudinal direction of the connecting horizontal pipe portion 72. The front main pipe portions 16A and 19A are extended in a V-shape obliquely forward toward the front main pipe portions 16A and 19A. It is joined.

  Further, the inclined connecting pipe portions 75 and 76 located on the rear side of the connecting horizontal pipe portion 72 are directed from the intermediate portion in the longitudinal direction of the connecting horizontal pipe portion 72 toward the left and right front main pipe portions 16A and 19A. The tip end side is obliquely inclined and joined to the front main pipe portions 16A and 19A in the vicinity of the vertical reinforcing pipe portions 17C and 20C. The rear connecting inclined pipe portions 75 and 76 are formed longer than the front connecting inclined pipe portions 73 and 74.

  Further, as shown in FIG. 25, the connecting horizontal pipe portion 72 is disposed at a position on the front side of the center joint 51, and the connecting inclined pipe portions 75 and 76 are on the left and right sides of the center joint 51. It is arrange | positioned so that it may expand diagonally and may be extended in V shape. The swing motor 50 and the center joint 51 are positioned between the left and right front main pipe portions 16A and 19A on the bottom plate 13 of the swing frame 11, and are separated from the rear connecting inclined pipe portions 75 and 76. It is arranged at a position between the plate 29.

  Thus, in the third embodiment configured as described above, it is possible to obtain substantially the same operational effects as those in the first embodiment. However, in the present embodiment, a connecting pipe portion 71 composed of a connecting horizontal pipe portion 72 and connecting inclined pipe portions 73 to 76 between the front main pipe portions 16A and 19A of the left and right vertical beams 14 and 15. Are connected in the left and right directions so as to form a framework structure.

  For this reason, the torsional rigidity and the like of the left and right vertical beams 14 and 15 can be increased by the connecting horizontal pipe portion 72 and the connecting inclined pipe portions 73 to 76, for example, by excavation reaction force from the work device 8. Even when an external force acts as a torsional load on the left and right vertical beams 14 and 15 via the swing post mounting portion 22, sufficient strength can be ensured.

  In the third embodiment, the connecting pipe portion 71 provided between the left and right front main pipe portions 16A, 19A is connected to the connecting horizontal pipe portion 72 and the connecting inclined pipe portions 73, 75, 76, 76. The case where it comprises is demonstrated and mentioned as an example. However, the present invention is not limited to this. For example, the connecting pipe portion 71 includes only the connecting horizontal pipe portion 72, and the front connecting inclined pipe portions 73 and 75 and / or the rear connecting inclined pipe portion 76, 76 may be omitted.

  In the first embodiment, the plurality of vertical reinforcing pipe portions 17 and 20 and the plurality of inclined reinforcing pipe portions 18 and 21 that form a substantially triangular truss structure between the main pipe portions 16 and 19 and the bottom plate 13. As an example, the case of providing is described. However, the present invention is not limited to this. For example, only one of the vertical reinforcing pipe portion and the inclined reinforcing pipe portion may be provided between the main pipe portion and the bottom plate, and the other may be omitted. In this case, the number of reinforcing pipe portions provided between the main pipe portion and the bottom plate can be further increased.

  This also applies to the second and third embodiments. Further, the reinforcing pipe portion provided between the main pipe portion and the bottom plate is not limited to the substantially triangular truss structure, but may be configured to have a substantially rectangular framework structure or a lattice structure having a lattice shape.

  Moreover, in the said 1st Embodiment, the hydraulic excavator 1 provided with the box-shaped cab 5 which defines a cab inside was mentioned as an example, and was demonstrated. However, the present invention is not limited to this. For example, the operation driving unit on which the operator gets on and off may be configured to cover the driver's seat from the upper side using a canopy. This also applies to the second and third embodiments.

  Further, in each of the embodiments, the description has been given by taking the small rear swivel excavator 1 as an example. However, the present invention is not limited to this. For example, the present invention may be applied to a swing frame of various construction machines provided with a swing post type working device.

1 Excavator (construction machine)
DESCRIPTION OF SYMBOLS 2 Lower traveling body 3 Turning wheel 4 Upper turning body 5 Cab 6 Exterior cover 7 Counterweight 8 Working device 8A Swing post 11 Turning frame 12 Center frame 13 Bottom plate 13A Bolt hole (turning wheel mounting part)
14, 15 Longitudinal beam 16, 19 Main pipe portion 16A, 19A Front main pipe portion 16B, 19B Rear main pipe portion 16C, 19C Rear end bent portion 17, 20, 61, 63 Vertical reinforcing pipe portion (reinforcing pipe portion)
18, 21, 62, 64 Inclined reinforcing pipe (reinforcing pipe)
22 Swing post mounting portion 22A Boss portion 22B Lower plate portion 23, 24 Mounting end portion 25 Upper plate portion 27 Cover plate 28 Weight mounting portion 29 Partition plate 30, 31 Left and right side frames 34, 35 Projecting beams 36, 37 Mounting plate 38 Cylinder mounting portion 42 Swing cylinder 44 Hydraulic oil tank 45 Fuel tank 46 Engine 47 Hydraulic pump 48 Exhaust gas aftertreatment device 49 Heat exchanger (radiator, oil cooler)
DESCRIPTION OF SYMBOLS 50 Turning motor 51 Center joint 52 Control valve 53 Hydraulic hose 54 Discharge piping 55 Return piping 71 Connection pipe part 72 Connection horizontal pipe part 73,74,75,76 Connection inclination pipe part O Turning center

Claims (7)

A bottom plate provided on the lower traveling body via a turning wheel, a left and right vertical beam provided on the upper side of the bottom plate and extending in the front and rear directions, and on the front side of the left and right vertical beams A swing post mounting portion provided on the front side of the bottom plate and swingably supporting a swing post type working device in the left and right directions; and positioned on the rear side of the left and right vertical beams In a swing frame of a construction machine comprising a weight mounting portion provided on the rear side of the bottom plate to which a counterweight is mounted,
The left and right vertical beams are formed of a pipe material extending along the front and rear directions of the bottom plate and connecting the swing post mounting portion on the front side and the weight mounting portion on the rear side together with the bottom plate. A swing frame for construction machinery.   Provided on the upper side of the bottom plate is a partition plate located on the front side of the weight mounting portion and extending left and right of the bottom plate. The left and right vertical beams made of the pipe material sandwich the partition plate. 2. A turning frame for a construction machine according to claim 1, wherein the turning frame extends in the front and rear directions.   The bottom plate is provided with a turning wheel mounting portion to which the turning wheel is attached, and the left and right vertical beams made of the pipe material are joined to the bottom plate by welding means at the position of the turning wheel mounting portion. The swing frame of a construction machine according to claim 1 or 2, wherein the swing post mounting portion is joined to the swing post mounting portion by welding means.   The bottom plate is provided with a turning wheel mounting portion to which the turning wheel is attached, and the left and right vertical beams made of the pipe material are joined to the bottom plate by welding means at the position of the turning wheel mounting portion. The turning frame of a construction machine according to claim 1 or 2, wherein the weight attaching portion is joined by welding means.   The left and right vertical beams are a main pipe portion made of a long pipe material extending in the front and rear directions of the bottom plate, and an upward, downward direction and / or an oblique direction between the main pipe portion and the bottom plate. 5. A turning frame for a construction machine according to claim 1, 2, 3 or 4, comprising a plurality of reinforcing pipe portions made of a short pipe material arranged extending in the direction.   The main pipe portion is provided by joining the front end thereof to the swing post mounting portion by welding means, and the rear end side is a rear end bent portion bent downward and bent, and the rear end bent portion 6. The turning frame for a construction machine according to claim 5, wherein the lower end portion is provided by being joined to the weight attachment portion by welding means.   The turning frame for a construction machine according to claim 1, 2, 3, 4, 5 or 6, wherein the left and right vertical beams are provided with a connecting pipe portion for connecting the left and right beams in the left and right directions.

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