JP6618436B2 - Small excavator - Google Patents

Description

  The present invention relates to a small hydraulic excavator that is suitably used for excavation work in a narrow work site such as an urban area, and more particularly to a small hydraulic excavator provided with an inspection opening for inspecting a power source such as an engine.

  In general, a small hydraulic excavator called a mini excavator is suitably used for excavation work in a narrow work site such as an urban area. Since this small hydraulic excavator is used for dismantling work inside buildings and excavation work in narrow places such as streets, the machine weight is set to about 0.8 to 4 tons, for example.

  Here, the small hydraulic excavator includes a lower traveling body, an upper revolving body supported on the lower traveling body via a revolving device, and a front device provided on the front side of the upper revolving body so as to be able to move up and down. It is configured. The small excavator is smaller than the vehicle width of the lower traveling body (width between the left and right traveling devices) so that it does not interfere with surrounding obstacles when the upper revolving body performs a turning operation in a narrow work site. At least the rear end of the upper swing body (outer peripheral surface of the counterweight) is configured to be able to swivel within a circular arc having a small radius.

  On the other hand, as a small hydraulic excavator, when the upper swing body is swung, the upper swing body and the front device have the vehicle width dimension of the lower traveling body and the length dimension in the front and rear directions of the lower traveling body. 2. Description of the Related Art There is known an ultra-small turning type small hydraulic excavator configured to fit. A micro hydraulic excavator of a super small turning type is usually provided with an offset front device. This offset front device has a lower boom and an upper boom, and an arm attached to the upper boom via an arm support is configured to translate in the left and right directions with respect to the lower boom.

  The offset front device can take a very small turning posture by largely raising the lower boom and folding the arm to the lower boom side. In this ultra-small turning posture, when the upper turning body is turned, the upper turning body and the offset front device can fully turn within the width dimension of the lower traveling body and the length dimension in the front and rear directions. Therefore, the ultra-small turning type small hydraulic excavator can smoothly perform the turning operation without contacting the surrounding obstacle with the upper turning body and the offset front device even in a narrow work site such as an urban area. Side gutter work or the like can be performed efficiently using the offset front device.

  The swing frame that constitutes the upper swing body of the ultra-small swing type small hydraulic excavator has a center frame to which the swing wheel of the swing device is mounted, and a center that is offset to the right in the left and right directions from the swing center of the upper swing body. It has left and right vertical plates standing on the frame. The front side of each vertical plate is a bracket to which the foot part of the lower boom constituting the offset front device is attached. Further, a counterweight having an arcuate outer peripheral side is provided on the rear side of the swing frame, and a power source including an engine, an alternator, a hydraulic pump, and a heat exchanger is disposed on the front side of the counterweight. Yes.

  Further, on the left side of the left vertical plate constituting the turning frame, a driver seat base is provided so as to cover the upper side of a power source such as an engine and a hydraulic pump. This driver's seat pedestal is set with a living area that passes the center line in the rear direction before and after passing through the turning center of the upper turning body. As described above, in the ultra-small turning type small hydraulic excavator, the boom foot portion of the offset front device is arranged near the center right side of the upper turning body formed as small as possible, and the operator's living area is located on the left side of the offset front device. The living area of this operator is set very small in relation to surrounding equipment.

  In addition, a footrest member is provided on the front side of the driver's seat base so that an operator can place his / her feet. On the right side of the boom foot, an oil storage tank such as a fuel tank or hydraulic oil tank is mounted on the swivel frame. Has been. A tank side cover is provided on the left side of the oil storage tank so as to extend forward and rearward along the right vertical plate of the revolving frame.

  Here, the power source including the engine, the alternator, the hydraulic pump, and the heat exchanger is covered with a driver seat base and an exterior cover. In view of this, the exterior cover or the like is provided with an inspection opening for inspecting the power source (see Patent Document 1).

JP 2001-322566 A

  Incidentally, the alternator is driven by an engine and is connected to the rotating shaft of the engine via a belt or the like. For this purpose, an opening for inspecting the alternator is provided between the driver's seat base and the tank side surface cover, located on the rear side of each vertical plate of the revolving frame. This position is behind the boom foot portion of the offset front device.

  In addition, a plurality of hydraulic hoses extend through the back surface of the boom to the offset front device located on the front side of the inspection opening. Each hydraulic hose has an allowance in the length dimension at the position of the boom foot so that a tensile load (tension) does not act when the boom is raised and lowered.

  On the other hand, the inspection opening can be greatly opened to improve workability such as inspection work. In order to make the inspection opening large as described above, it is necessary to form an inspection opening and an inspection cover for closing the inspection opening so as to extend to the vicinity of the boom foot portion. In this case, the bolt for attaching the inspection cover is also arranged in the vicinity of the boom foot portion.

  As a result, when the boom is lifted, there is a possibility that each hydraulic hose that has slackened will interfere with the bolt. Therefore, in the current small hydraulic excavator, the size of the inspection opening must be limited so that each hydraulic hose does not interfere with the bolt, and there is a problem that workability is lowered.

  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 provide a small hydraulic excavator that can improve inspection and maintenance workability by forming a large inspection opening. There is.

The present invention relates to a lower traveling body, an upper swinging body supported by the lower traveling body via a swing device, and a plurality of hydraulic pressures that are provided on the upper swinging body so as to be able to be lifted and lowered and supply and discharge pressure oil to and from an actuator. hose consists offset front device extending through the back of the boom, said upper rotating body, Se left of the turning center of the upper rotating body on the printer frame, left offset to the right the right, the right a swivel frame vertical plates are erected, before and engine that is kicked set above the Ki旋 times frame, to so as to cover the upper side of the engine located to the left of the left vertical plate of the rotating frame wherein the driver's seat pedestal provided et the on the rotating frame, the oil storage tank mounted on the revolving frame positioned on the right side of the Bumufuto portion before Kio full set front device, positioned on the left side of the oil storage tank The turning frame And a tank side surface cover that extends in the front and rear directions along the right vertical plate, and the upper turning body and the offset front device can turn within the vehicle width of the lower traveling body. It is applied to a small excavator of ultra-small turning type.

A feature of the configuration adopted by the present invention is that it is provided between the driver seat base and the tank side cover and is located on the rear side of each vertical plate of the revolving frame for inspecting the engine. An inspection opening opened in a tilted state so as to stand up toward the side, and the inspection opening is detachably closed, and the offset front device is lifted and folded into a very small turning posture. An inspection cover comprising an inclined surface along which the boom and each hydraulic hose run, and a lower cover provided on the lower side of the inspection cover and removably fastened using a screw member at a front side portion of the inspection cover; Each boom hose part of the offset front device is provided in the lower cover and located in the vicinity of the screw member. In that a guide member for guiding the respective hydraulic hoses away towards.

  According to the present invention, the inspection opening can be formed large, and the workability of inspection and maintenance can be improved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a very small turning type small hydraulic excavator applied to an embodiment of the present invention. It is a front view which shows a small hydraulic excavator in the state which made the offset front apparatus the ultra small turning posture. It is the top view which looked at the small excavator from the upper part in the state where a canopy was omitted. It is a top view which shows the state which removed the inspection cover of the small hydraulic excavator of FIG. It is a top view which shows the upper revolving body in the state which omitted the driver's seat base, the lever / pedal mounting plate of the floor support frame, and various covers. It is a partially broken front view showing an upper swing body, a boom of an offset front device, a hydraulic hose, and the like. It is the perspective view which looked at a turning frame, an engine, an alternator, a driver's seat base, a driver's seat, a footrest member, etc. from the right front side. It is the perspective view which looked at the turning frame, the driver's seat base, the control valve group, etc. from the left front side. It is the disassembled perspective view which looked at the turning frame, the driver's seat base, etc. from the left front side. It is a top view which shows a turning frame alone. It is a perspective view which shows the state which assembled the lower cover and the inspection cover. It is a disassembled perspective view which shows the state which isolate | separated the lower cover and the inspection cover. It is a top view which shows a lower cover alone. It is sectional drawing which looked at the lower cover from the arrow XIV-XIV direction in FIG.

  Hereinafter, an embodiment of a small hydraulic excavator according to the present invention will be described in detail with reference to FIGS. 1 to 14 by taking an ultra-small turning type small hydraulic excavator as an example.

  1 and 2, the ultra-small swivel type small hydraulic excavator 1 is used for excavation work in a narrow place such as a side ditching operation on a roadside in an urban area, for example, the machine weight is 0.8 to 4 tons, for example. Is set to about. The small excavator 1 is capable of self-propelled lower traveling body 2 having crawler traveling devices 2B on both the left and right sides of the track frame 2A, and can be turned on the lower traveling body 2 via a turning device 3. The upper revolving body 4 supported, the earth removing board 5 provided on the front side of the lower traveling body 2, and the offset front device 6 provided on the front side of the upper revolving body 4 so as to be able to move up and down are configured. Yes.

  The turning device 3 includes a turning wheel 3A provided between the lower traveling body 2 and the upper turning body 4, and a turning motor 3B (see FIG. 5) that drives the upper turning body 4 to turn. The outer ring 3A1 forming the turning wheel 3A is attached to the lower surface of the center frame 7A of the turning frame 7 described later using a plurality of bolts (not shown).

  The offset front device 6 includes a lower boom 6A in which a boom foot portion 6A1 is attached to left and right front vertical plates 7B and 7C of a revolving frame 7, which will be described later, and a left and right swing on the tip side of the lower boom 6A. An upper boom 6B that is movably mounted, an arm support 6C that is swingably mounted left and right on the distal end side of the upper boom 6B, and an upward and downward pivotable movement on the distal end side of the arm support 6C An arm 6D attached to the arm 6D, a bucket 6E rotatably attached to the tip end side of the arm 6D, a link 6F connecting the lower boom 6A and the arm support 6C, and the operation thereof The boom cylinder 6G, the offset cylinder 6H, the arm cylinder 6J, and the bucket cylinder 6K are configured.

  On the other hand, as shown in FIGS. 3 and 6, the foot portion 6A1 of the lower boom 6A is rotatable via the connecting pin 6L to the brackets 7B1 and 7C1 positioned on the front side of the left and right front vertical plates 7B and 7C. Are combined. Further, each of the cylinders 6G to 6K is connected to a later-described control valve group 22 via each hydraulic hose 31.

  The offset front device 6 translates the arm 6D in the left and right directions with respect to the lower boom 6A as the offset cylinder 6H expands and contracts. In this state, excavation work such as a gutter can be performed by rotating the arm 6D and the bucket 6E while raising and lowering the lower boom 6A.

  Here, as shown in FIG. 2, the offset front device 6 can take an ultra-small turning posture by raising the tip side of the lower boom 6 </ b> A to the farthest rear and folding the arm 6 </ b> D to the lower boom 6 </ b> A side. . In a state where the offset front device 6 is in a very small turning posture (upwardly raised), when the upper turning body 4 is turned, the upper turning body 4 and the offset front device 6 are connected to the lower traveling body 2. It is configured to be able to make full turns within the left and right width dimensions (vehicle width dimensions) and the front and rear length dimensions. In this case, as shown in FIG. 3, the vehicle width dimension of the lower traveling body 2 is set by the width dimension L between the left and right traveling apparatuses 2B.

  The upper swing body 4 includes a swing frame 7, a counterweight 9, an engine 10, an alternator 11, a hydraulic pump 12, a heat exchanger 13, a driver seat base 14, a footrest member 15, a fuel tank 23, a hydraulic oil tank 24, which will be described later. The tank side cover 26, the inspection opening 33, the inspection cover 34, the lower cover 35, the guide member 42, and the hose regulating member 43 are configured.

  Here, as shown in FIG. 3, the upper-part turning body 4 has a width dimension in the left and right directions substantially equal to the vehicle width dimension of the lower traveling body 2 (the width dimension L between the left and right traveling devices 2B). doing. On the other hand, the outer peripheral surface 9 </ b> A of the counterweight 9 is formed in a substantially circular shape when viewed from above so as to be within a virtual circle C having a turning radius R around the turning center O of the upper turning body 4. As a result, the small excavator 1 is in a state where the upper turning body 4 turns around the turning center O on the lower traveling body 2 in the ultra-small turning posture with the offset front device 6 raised upward. The swing body 4 is configured as an ultra-small swing type hydraulic excavator that fits within the left and right width dimensions (vehicle width dimension) and the front and rear length dimensions of the lower traveling body 2 together with the offset front device 6. Yes.

  Next, the structure of the turning frame 7 that forms the support structure of the upper turning body 4 will be described.

  The revolving frame 7 is a base of the upper revolving structure 4 and forms a strong support structure. As shown in FIGS. 9 and 10, the turning frame 7 includes a flat center frame 7A to which the outer ring 3A1 of the turning wheel 3A constituting the turning device 3 is attached, and an intermediate portion in the front and rear directions of the center frame 7A. The left front vertical plate 7B, the right front vertical plate 7C, and the front of the center frame 7A, which are erected and extend in the front and rear directions with a fixed spacing left and right on the center frame 7A. , An intermediate horizontal plate 7D erected from the rear end of the right front vertical plate 7C located at the rear intermediate portion to the left and left of the right direction, and an intermediate horizontal plate 7D positioned near the left end of the center frame 7A. Left rear vertical plate 7E extending rearward from the rear, right rear vertical plate 7F extending rearward from the intermediate horizontal plate 7D so as to continue to the rear side of the right front vertical plate 7C, The rear vertical plates 7E and 7F on the right extend leftward and rightward across the rear ends. A rear lateral plate 7G, is configured to include a floor support frame 8 to the later.

  The center frame 7A is made of, for example, a thick steel plate, and is formed in a rectangular shape that is long in the front and rear directions. The left and right front vertical plates 7B and 7C are arranged at positions shifted to the right in the left and right directions from the turning center O (see FIG. 10) of the upper turning body 4. Of the left and right front vertical plates 7B and 7C, portions located on the front side of the turning center O are angled brackets 7B1 and 7C1 protruding upward from the center frame 7A. A boom foot portion 6A1 of the lower boom 6A is attached to the brackets 7B1 and 7C1 so as to be able to move up and down.

  The left front vertical plate 7B is provided with a hose insertion hole 7B2 positioned on the front side of the bracket 7B1 and above the reinforcing member 7P described later. Each hydraulic hose 31 is inserted through the hose insertion hole 7B2. A cylinder bracket 7H is provided between the front vertical plates 7B and 7C, and a boom cylinder 6G is attached to the cylinder bracket 7H.

  On the other hand, the intermediate horizontal plate 7D is positioned rearward of the turning center O, extends to the left of the left front vertical plate 7B, and protrudes leftward from the left end of the center frame 7A. The intermediate horizontal plate 7D partitions the space between an engine 10 and a control valve group 22, which will be described later, and supports the front side of a driver seat base 14, which will be described later.

  On the front side of the center frame 7A are a right front frame 7J located on the left side of the left front vertical plate 7B and extending from the center frame 7A to the front side along the left front vertical plate 7B, and a center frame 7A spaced to the left from the right front frame 7J. A left front frame 7K that extends forward from the left end of the left frame, an inclined frame 7L that is located near the rear side of the left front frame 7K and extends diagonally forward from the left end of the center frame 7A, and a center along the intermediate horizontal plate 7D. A left rear frame 7M extending leftward from the frame 7A is provided. Each of these frames 7J to 7M supports a floor support frame 8 described later.

  On the right side of the center frame 7A, a plate-like right extending plate 7N is provided so as to extend rightward from the center frame 7A, the right front vertical plate 7C, and the right rear vertical plate 7F so as to extend the center frame 7A to the right. . The right overhang plate 7N supports a fuel tank 23, a hydraulic oil tank 24, and the like, which will be described later.

  A reinforcing member 7P is provided between the left front vertical plate 7B and the right front vertical plate 7C. The reinforcing member 7P includes a mountain-shaped upper surface portion 7P1 and a front surface portion 7P2 bent downward from the front end of the upper surface portion 7P1. A front side portion of a lower plate portion 36 of the lower cover 35 described later is attached to the upper surface portion 7P1 using a bolt 36B.

  Further, on the left side of the center frame 7A, a turning motor insertion hole 7Q is provided on the left front side of the turning center O. In addition, a turning motor mounting seat 7R is provided at a position corresponding to the turning motor insertion hole 7Q so as to overlap the upper surface of the center frame 7A. The turning motor mounting seat 7R is for mounting the turning motor 3B.

  As shown in FIGS. 8 and 9, the floor support frame 8 constitutes the left front side portion of the revolving frame 7. The floor support frame 8 includes a right front frame 7J, a left front frame 7K, an inclined frame 7L, and a left rear provided at a corner portion on the left front side of the center frame 7A (an area partitioned by the left front vertical plate 7B and the intermediate horizontal plate 7D). It is attached to the frame 7M.

  The floor support frame 8 includes a lower plate 8A composed of a substantially fan-shaped flat plate whose left end is curved in an arc shape along the imaginary circle C described above, a column 8B erected on the front side of the lower plate 8A, and a column 8B It includes a lever / pedal mounting plate 8C provided on the upper portion so as to extend in the left and right directions. The lower plate 8A of the floor support frame 8 is attached to each of the frames 7J to 7M provided on the center frame 7A, and a control valve group 22 is mounted on the upper surface side of the lower plate 8A.

  As shown in FIGS. 3 and 5, the counterweight 9 is attached to the rear side of the turning frame 7 in order to balance the weight with the offset front device 6. The counterweight 9 is formed as an arc-shaped heavy object whose center in the left and right directions protrudes backward. As a result, the outer peripheral surface 9A of the counterweight 9 is formed as an arc surface that is substantially contained within the imaginary circle C having the turning radius R described above.

  Next, an engine 10, an alternator 11, a hydraulic pump 12, and a heat exchanger 13 that are located on the front side of the counterweight 9 and are disposed on the upper side of the revolving frame 7 and that constitute a power source will be described.

  The engine 10 constituting the power source is mounted on the turning frame 7 so as to be positioned in front of the counterweight 9. The engine 10 is mounted between the intermediate horizontal plate 7D and the rear horizontal plate 7G of the revolving frame 7 in a horizontally placed state extending left and right on the rear vertical plates 7E and 7F. A hydraulic pump 12 described later is attached to the left side of the engine 10. On the other hand, on the right side of the engine 10, a cooling fan 10A is provided at the tip of a protruding rotating shaft (not shown).

  The alternator 11 is driven by the engine 10 to supply generated electric power to a battery 25 described later. The alternator 11 constitutes a part of the engine 10 and is attached to the front side position of the engine 10. Specifically, the alternator 11 is connected to the rotating shaft of the engine 10 via a belt 11A or the like. Here, since the alternator 11 is provided at a position corresponding to the rotation shaft of the engine 10, it is disposed behind the lower boom 6A of the offset front device 6 as shown in FIGS.

  As shown in FIGS. 5 and 6, the hydraulic pump 12 is attached to the left side of the engine 10 and is driven to rotate by the engine 10. The hydraulic pump 12 discharges the oil as high pressure oil while sucking the oil from a hydraulic oil tank 24 described later. The pressure oil discharged from the hydraulic pump 12 is supplied to the hydraulic cylinders 6G to 6K of the offset front device 6 through the control valve group 22 and the hydraulic hoses 29, 30, and 31.

  The heat exchanger 13 is provided on the revolving frame 7 so as to face the cooling fan 10 </ b> A of the engine 10. The heat exchanger 13 includes a radiator, an oil cooler, and the like.

  Next, the configuration of the driver seat base 14 provided on the turning frame 7 will be described.

  The driver seat base 14 is located on the left side of the left front vertical plate 7 </ b> B constituting the turning frame 7 and is provided on the turning frame 7 so as to cover the upper side of the engine 10. This driver's seat pedestal 14 has a left front vertical plate that passes through the center line A-A when the rear center line is AA (see FIG. 3) before passing through the turning center O of the upper swing body 4. An area reaching 7B is set as a living space for the operator. As described above, the small excavator 1 according to the present embodiment is set by the driver seat base 14 by maximally effectively using the narrow area formed on the left side of the offset front device 6 in the upper swing body 4. It is the structure which can ensure the living space of the operator who can be as large as possible.

  Here, as shown in FIGS. 8 and 9, the driver's seat pedestal 14 is positioned on the intermediate horizontal plate 7 </ b> D of the revolving frame 7, and extends in the left and right directions, and a front portion 14 </ b> A and a front portion From a driver seat mounting portion 14B extending rearward from the upper portion of 14A, a back plate portion 14C inclined obliquely upward toward the rear side from the rear portion of the driver seat mounting portion 14B, and an upper portion (rear portion) of the back plate portion 14C A weight attachment part 14D extending to the rear side, and located at the right end of the front part 14A, the driver seat attachment part 14B and the back plate part 14C, is inclined from the upper and lower middle parts of the front part 14A to the weight attachment part 14D. And the left opening frame 14E extending.

  The left opening frame 14E constitutes a left frame portion of the inspection opening 33. Further, the left opening frame 14E is inclined at an angle along which the lower boom 6A and the hydraulic hoses 31 extending through the back surface 6A2 of the lower boom 6A are aligned when the offset front device 6 is in a very small turning posture.

  The driver seat pedestal 14 has a lower portion of the front surface portion 14 </ b> A attached to an upper portion of the intermediate horizontal plate 7 </ b> D of the revolving frame 7, and a weight attachment portion 14 </ b> D attached to the upper surface of the counterweight 9. Thus, the driver seat base 14 covers the front side and the upper side of the engine 10 and the hydraulic pump 12. A driver seat 16, which will be described later, left and right front operating devices 17 and 18, and the like are attached to the driver seat mounting portion 14 </ b> B of the driver seat base 14. Further, the weight attaching portion 14D has an extending portion 14D1 extending to the right side beyond the left opening frame 14E. The extending portion 14D1 serves as a mounting seat for mounting a rear mounting plate portion 34C of the inspection cover 34 described later. The front end portion of the extending portion 14D1 constitutes a frame portion on the rear side of the inspection opening 33.

  As shown in FIG. 8, the footrest member 15 is provided on the revolving frame 7 on the front side of the driver seat base 14. The footrest member 15 is formed of a rectangular flat plate extending in the left and right directions. The front side of the footrest member 15 is attached to the lever / pedal attachment plate 8C of the floor support frame 8, and the rear side is attached to the lower portion of the front portion 14A of the driver seat base 14.

  Next, the configuration of the driver's seat 16 and the left and right front operating devices 17 and 18 mounted on the driver's seat base 14 will be described.

  As shown in FIGS. 3 and 7, the driver's seat 16 is attached to the driver's seat mounting portion 14 </ b> B of the driver's seat base 14 and is seated by the operator. Left and right front operating devices 17 and 18 for operating the turning device 3 and the offset front device 6 are provided on both the left and right sides of the driver's seat 16.

  The traveling operation lever 19 is provided on the lever / pedal mounting plate 8 </ b> C of the floor support frame 8 that is in front of the driver seat 16. The traveling operation lever 19 is for operating the traveling of the lower traveling body 2 by tilting in the forward and backward directions. Further, on the lever / pedal mounting plate 8C, operation pedals 20 and 21 are arranged on both the left and right sides of the travel operation lever 19, respectively. Each of these operation pedals 20 and 21 performs, for example, an offset operation of the offset front device 6 and an operation of an accessory device attached as an option.

  The control valve group 22 is provided on the lower side of the footrest member 15, that is, on the lower plate 8 </ b> A of the floor support frame 8 constituting the revolving frame 7. The control valve group 22 is configured by connecting a plurality of control valves in the left and right directions, and each cylinder 6G to 6K of the offset front device 6, a travel motor of the lower traveling body 2, a swing motor 3B of the swing device 3, and The hydraulic pump 12 is connected via hydraulic hoses 29, 30, and 31 described later.

  The fuel tank 23 is mounted on the turning frame 7 so as to be positioned on the right side of the boom foot portion 6A1 of the offset front device 6. The fuel tank 23 constitutes an oil storage tank, and is mounted on the front side of the right extension plate 7N of the revolving frame 7 and stores fuel supplied to the engine 10.

  The hydraulic oil tank 24 constitutes an oil storage tank together with the fuel tank 23, and is mounted on the revolving frame 7 so as to be located on the right side of the boom foot portion 6 </ b> A <b> 1 of the offset front device 6. The hydraulic oil tank 24 is located on the rear side of the fuel tank 23 and is mounted on the right extending plate 7N of the revolving frame 7. The hydraulic oil tank 24 stores hydraulic oil supplied to hydraulic actuators such as the cylinders 6G to 6K of the offset front device 6, the traveling motor of the lower traveling body 2, and the turning motor 3B of the turning device 3. A battery 25 (see FIG. 5) is provided behind the hydraulic oil tank 24 and on the right side of the heat exchanger 13 on the right extension plate 7N. Electric power is supplied to the battery 25 from the alternator 11.

  As shown in FIGS. 4 and 6, the tank side cover 26 is located on the left side of the fuel tank 23 and the hydraulic oil tank 24, and is provided to extend forward and rearward along the right front vertical plate 7 </ b> C of the revolving frame 7. ing. On the rear side of the tank side cover 26, a right opening frame 26A is provided facing the left opening frame 14E of the driver seat base 14 in the left and right directions.

  The right opening frame 26A is formed to be inclined in the same manner as the left opening frame 14E, and constitutes a right frame portion of the inspection opening 33. Similarly to the left opening frame 14E described above, the right opening frame 26A is an angle along which the lower hose 6A and each hydraulic hose 31 extending through the back surface 6A2 of the lower boom 6A meet when the offset front device 6 is in a very small turning posture. It is inclined at.

  The exterior cover 27 includes a left front cover portion 27A that covers the periphery of the floor support frame 8 of the revolving frame 7, a left rear cover portion 27B that covers the space between the left front cover portion 27A and the counterweight 9, a fuel tank 23, and a hydraulic oil tank. The tank cover portion 27C that covers 24, the heat exchanger cover 27D that is located behind the tank cover portion 27C and covers the heat exchanger 13, the battery 25, and the like, and the counterweight 9 can be opened and closed for maintenance of the engine 10. And an engine cover portion 27E provided on the vehicle.

  The center joint 28 is provided on the track frame 2 </ b> A of the lower traveling body 2 so as to be positioned at the turning center O of the upper rotating body 4. The center joint 28 circulates pressure oil between the upper swing body 4 and the lower traveling body 2 even during the swing operation of the upper swing body 4.

  Next, the configuration of a plurality of hydraulic hoses 29, 30, and 31 that connect the hydraulic cylinders 6G to 6K and the like of the offset front device 6 to the hydraulic pump 12 and the control valve group 22 will be described. In the present embodiment, various pipes for supplying and discharging pressure oil are collectively referred to as a hydraulic hose. That is, the hydraulic hose includes a flexible pressure hose, a metal pipe, and the like.

  As shown in FIG. 5, the plurality of hydraulic hoses 29 connect the hydraulic pump 12 and the control valve group 22. The plurality of hydraulic hoses 30 connect the control valve group 22, the turning motor 3 </ b> B, and the center joint 28. Further, the plurality of hydraulic hoses 31 connect between the control valve group 22 and the hydraulic cylinders 6G to 6K of the offset front device 6. These hydraulic hoses 29, 30 and 31 constitute part of the offset front device 6.

  Of the plurality of hydraulic hoses 31, two hydraulic hoses 31 extend to the right side from the control valve group 22 and pass through the hose insertion hole 7B2 formed in the left front vertical plate 7B of the revolving frame 7 and on the reinforcing member 7P. It protrudes, is bent forward on the upper surface portion 7P1 of the reinforcing member 7P, and is connected to the boom cylinder 6G.

  On the other hand, among the plurality of hydraulic hoses 31, the remaining hydraulic hose 31 extends rightward from the control valve group 22 and protrudes on the reinforcing member 7P through the hose insertion hole 7B2 of the left front vertical plate 7B, and this reinforcing member 7P Is bent rearward on the upper surface portion 7P1. Further, as shown in FIG. 6, each hydraulic hose 31 extending rearward on the reinforcing member 7 </ b> P passes under the lower foot 35 of the lower boom 6 </ b> A of the lower boom 6 </ b> A constituting the offset front device 6. It reaches on the plate portion 36 and is bent upward on the front side of the rising plate portion 37. Then, each hydraulic hose 31 extending upward through the front side of the rising plate portion 37 extends to the front end side of the lower boom 6A through the back surface 6A2 of the lower boom 6A and is connected to the offset cylinder 6H, the arm cylinder 6J, and the bucket cylinder 6K. Has been.

  Here, each hydraulic hose 31 passing through the back surface 6A2 of the lower boom 6A needs to have a length dimension for turning around the boom foot portion 6A1 when the lower boom 6A is swung. For this reason, when the lower boom 6 </ b> A is largely lifted, a slack portion 31 </ b> A is formed in each hydraulic hose 31. Therefore, a space between the boom foot portion 6A1 and the lower plate portion 36 and the rising plate portion 37 of the lower cover 35 to allow a slack portion 31A to be generated in each hydraulic hose 31 when the lower boom 6A is lifted. A portion 32 is formed. In this case, there is a possibility that the slack portion 31A contacts the head 40A of the front mounting bolt 40 located in the vicinity of the rear side. However, in the present embodiment, the contact with the head 40A is prevented by guiding the slack portion 31A away from the head 40A toward the boom foot 6A1 by a guide member 42 described later.

  Next, the structure of the inspection opening 33, the inspection cover 34, and the lower cover 35 related to the characteristic part of the present invention will be described.

  As shown in FIG. 4, the inspection opening 33 is located on the rear side of the front vertical plates 7B and 7C of the revolving frame 7 in order to check the engine 10, the alternator 11, and the like. It is provided between the cover 26. Specifically, the inspection opening 33 includes a front end portion of the extension portion 14D1 of the weight mounting portion 14D of the driver seat base 14, the left opening frame 14E, the right opening frame 26A of the tank side surface cover 26, and a lower cover 35 described later. It is formed as an opening that is long in the front, rear, upper, and lower directions surrounded by the recessed frame 37C. Further, the inspection opening 33 is opened in an inclined state so as to rise from the front side toward the rear side. In this case, the inspection opening 33 can be formed as a large opening by extending the front side of the inspection opening 33 to a position reaching the vicinity of the boom foot portion 6A1 of the lower boom 6A.

  The inspection cover 34 is provided by detachably closing the inspection opening 33. As shown in FIG. 6, the inspection cover 34 includes an inclined surface along which the lower boom 6 </ b> A and the hydraulic hoses 31 that extend the back surface 6 </ b> A <b> 2 of the lower boom 6 </ b> A are aligned when the offset front device 6 is in a very small turning posture.

  Specifically, as shown in FIGS. 11 and 12, the inspection cover 34 is inclined so as to extend along the left opening frame 14 </ b> E of the driver seat base 14 and the right opening frame 26 </ b> A of the tank side cover 26. The plate portion 34A is formed by a front mounting plate portion 34B extending downward from the front end of the inclined plate portion 34A, and a rear mounting plate portion 34C extending rearward from the rear end of the inclined plate portion 34A. The front mounting plate portion 34B is provided with bolt insertion grooves 34D through which front mounting bolts 40, which will be described later, are inserted, at intervals in the left and right directions. On the other hand, the rear mounting plate portion 34C is provided with bolt insertion holes 34E through which rear mounting bolts 41, which will be described later, are inserted, at intervals in the left and right directions.

  The inspection cover 34 passes the front mounting bolts 40 through the bolt insertion grooves 34D of the front mounting plate 34B, and fastens the front mounting bolts 40 to the rising plate 37 of the lower cover 35. Further, the rear mounting bolts 41 are inserted into the respective bolt insertion holes 34E of the rear mounting plate portion 34C, and the respective rear mounting bolts 41 are fastened to the extending portions 14D1 of the weight mounting portion 14D of the driver seat base 14. Thereby, the inspection cover 34 can block | close the inspection opening 33 so that attachment or detachment is possible.

  The lower cover 35 is provided below the front mounting plate portion 34B of the inspection cover 34. As shown in FIGS. 6 and 11, a front mounting plate portion 34 </ b> B serving as a front portion of the inspection cover 34 is detachably fastened to the lower cover 35 using a front mounting bolt 40. As shown in FIGS. 12 to 14, the lower cover 35 is formed by bending or welding an iron-based metal material such as a steel plate. The lower cover 35 includes a lower plate portion 36 extending forward and rearward on the lower side of the lower boom 6 </ b> A constituting the offset front device 6, a rising plate portion 37 rising from the rear portion of the lower plate portion 36, and a rising plate portion 37. The left plate portion 38 extends from the left end edge to the front side, and the right plate portion 39 extends from the right end edge of the rising plate portion 37 to the front side. Further, a guide member 42 described later is attached to the rising plate portion 37.

  The lower plate portion 36 is formed as a substantially rectangular plate extending in the front and rear directions. The lower plate portion 36 is gently inclined downward toward the front side, and a bolt insertion groove 36A is provided at the front end portion with a spacing in the left and right directions. Here, the lower plate portion 36 has a front end positioned substantially directly below the boom foot portion 6A1 (connection pin 6L) of the lower boom 6A, and a rear end positioned above the intermediate horizontal plate 7D of the revolving frame 7. The lower plate portion 36 is attached to the reinforcing member 7P by screwing bolts 36B (see FIG. 6) inserted into the respective bolt insertion grooves 36A to the upper surface portion 7P1 of the reinforcing member 7P of the turning frame 7.

  As shown in FIG. 14, the rising plate portion 37 is formed as a plate body bent in an S-shaped cross section so that the lower position is recessed backward and the upper position projects forward. An overhanging portion 37A that is located on the upper side of the rising plate portion 37 and projects forward is formed as a substantially vertical flat surface. Two screw holes 37B are formed in the overhanging portion 37A corresponding to each bolt insertion groove 34D of the inspection cover 34. A front mounting bolt 40 is screwed into each screw hole 37B, and is formed by, for example, a welding nut. On the upper part of the rising plate portion 37, a recessed frame 37C made of a rectangular cutout that is wide in the left and right directions is formed up to a position near each screw hole 37B. The recessed frame 37 </ b> C constitutes a lower frame portion of the inspection opening 33. Further, a guide member 42 described later is attached to the overhanging portion 37A so as to be positioned near the lower side of each screw hole 37B.

  The left plate portion 38 is formed of a flat plate extending in the upward and downward directions, and is attached to a structure disposed facing each other, for example, a canopy 44 (described later), a driver seat base 14 or the like using bolts (not shown). ing.

  The right plate portion 39 is formed by an inverted U-shaped flat plate extending along the right front vertical plate 7 </ b> C of the revolving frame 7. The right plate portion 39 is attached to the tank side surface cover 26 using bolts (not shown). Further, the right plate portion 39 is formed with a notch portion 39A for avoiding the connecting pin 6L and the like of the offset front device 6 that is located in the middle portion in the front and rear directions. Further, the right plate portion 39 is provided with a hose regulating member 43 described later.

  As shown in FIGS. 11 and 12, the front mounting bolt 40 detachably mounts the front side portion of the inspection cover 34 to the upper side portion of the rising plate portion 37 constituting the lower cover 35 and is separated in the left and right directions. Two are provided. The front mounting bolt 40 includes a hexagonal columnar head 40A and a threaded portion 40B extending on the same axis from the head 40A.

  Here, each front mounting bolt 40 is screwed into the screw hole 37B of the rising plate portion 37 from the front side so that the inspection cover 34 can be easily removed from the outside when the engine 10, the alternator 11 and the like are inspected. Has been. For this reason, the head 40A of each front mounting bolt 40 protrudes toward each hydraulic hose 31 side.

  As shown in FIGS. 3 and 6, the rear mounting bolt 41 is detachably mounted on the weight mounting portion 14 </ b> D of the driver seat pedestal 14 at the rear portion of the inspection cover 34, and is separated by 2 in the left and right directions. The book is provided. Each rear mounting bolt 41 can be easily attached and detached from the outside (upper side), similarly to each front mounting bolt 40.

  Next, the structure of the guide member 42 and the function of the guide member 42 that are characteristic portions of the present invention will be described.

  As shown in FIGS. 13 and 14, the guide member 42 is configured as a convex body provided in the lower cover 35 in the vicinity of each front mounting bolt 40. Specifically, the guide member 42 is welded to an overhanging portion 37A of the rising plate portion 37 constituting the lower cover 35 so as to extend a long cylindrical body made of a ferrous metal material such as a steel material in the left and right directions. It is fixed using means. Here, as for the guide member 42, the front top part 42A side which each hydraulic hose 31 hits has comprised the circular arc shape. Further, the diameter dimension of the guide member 42 is set to a dimension larger than the projecting dimension of the head 40A so that each hydraulic hose 31 contacts the front top 42A before hitting the head 40A of each front mounting bolt 40, for example. Yes. As the guide member 42, a commercially available round bar that can be obtained at low cost can be used.

  Thereby, in the space part 32 between the boom foot part 6A1 of the lower boom 6A and the lower plate part 36 and the rising plate part 37 of the lower cover 35, the slack portion 31A of each hydraulic hose 31 is pressed to the rising plate part 37 side. In this case, the guide member 42 guides each hydraulic hose 31 from the head 40A of each front mounting bolt 40 toward the boom foot 6A1 of the lower boom 6A with the arc-shaped front top 42A. Thereby, it can prevent beforehand that each hydraulic hose 31 contact | abuts to the head 40A of each front attachment bolt 40. FIG. Moreover, the front top portion 42A with which each hydraulic hose 31 comes into contact has an arc shape, so there is no possibility that each hydraulic hose 31 is damaged.

  The hose restricting member 43 is provided on the right plate portion 39 of the lower cover 35. The hose restricting member 43 restricts each hydraulic hose 31 from hitting the edge portion of the peripheral edge of the right front vertical plate 7C, for example. The hose restricting member 43 is formed by bending a metal round bar into a substantially S shape along the periphery of the right front vertical plate 7C. Further, both end portions in the length direction of the hose restricting member 43 are bent to the right side and attached to the right plate portion 39.

  Accordingly, the hydraulic hoses 31 are pressed against the right front vertical plate 7C or the right plate portion 39 of the lower cover 35 by the restoring force of the hydraulic hoses 31 bent at the position of the hose insertion hole 7B2 of the right front vertical plate 7C. Even in this case, the hose restricting member 43 can restrict each hydraulic hose 31 from being pressed against the right front vertical plate 7C or the like by contacting each hydraulic hose 31.

  The canopy 44 is provided above the turning frame 7 and the counterweight 9 so as to cover the upper side and the right side of the driver's seat 16. The canopy 44 is configured as a three-post canopy, for example. Further, the floor mat 45 is spread so as to cover the upper side of the floor support frame 8 and the footrest member 15.

  The ultra-small turning type small hydraulic excavator 1 according to the present embodiment has the above-described configuration, and the operation thereof will be described next.

  First, the operator gets on the footrest member 15 and sits on the driver's seat 16. An operator seated in the driver's seat 16 can drive the lower traveling body 2 by operating the traveling operation lever 19. On the other hand, when the operator operates the left and right front operation devices 17 and 18 by lever operation, the turning operation of the upper turning body 4 and the excavation work of earth and sand by the offset front device 6 can be performed.

  In this case, the ultra-small swivel type hydraulic excavator 1 makes the upper swing body 4 and the offset front apparatus 6 to the left of the lower traveling body 2 by setting the offset front device 6 to the ultra-small swing posture shown in FIG. , It is possible to make a full turn within the width dimension in the right direction (vehicle width dimension) and the length dimension in the front and rear directions. As a result, the small excavator 1 can smoothly perform a side ditching operation and the like using the offset front device 6 without interfering with surrounding obstacles even in a narrow work site such as an urban area.

  Next, the case where the engine 10, the alternator 11, etc. are inspected will be described. In this case, the front mounting bolts 40 can be loosened, the rear mounting bolts 41 can be removed, and then the inspection cover 34 can be removed by pulling it upward. Thereby, since the inspection opening 33 can be opened, the engine 10, the alternator 11, and the like can be inspected or maintained through the inspection opening 33. At this time, since the inspection opening 33 is largely opened to the vicinity of the lower boom 6A constituting the offset front device 6, workability at the time of inspection work can be improved.

  On the other hand, when the inspection opening 33 is greatly opened to the vicinity of the lower boom 6A, the head portion 40A of the front mounting bolt 40 for attaching the front portion of the inspection cover 34 to the rising plate portion 37 of the lower cover 35 is provided for each hydraulic pressure. The hose 31 is disposed close to the hose 31. For this reason, when the offset front device 6 is lifted to a very small turning posture, a slack portion 31A is formed in each hydraulic hose 31, and the slack portion 31A may hit the head 40A of each front mounting bolt 40. .

  However, according to the present embodiment, the driver seat base 14 and the tank side cover are located behind the front vertical plates 7B and 7C of the revolving frame 7 in order to check the power sources of the engine 10, the alternator 11, and the like. 26, the inspection opening 33 that is inclined so as to rise from the front side toward the rear side, and the inspection opening 33 is detachably closed, and the offset front device 6 is lifted up and down. The inspection cover 34 is formed of an inclined surface along which the lower boom 6A and each hydraulic hose 31 are aligned when folded into a very small turning posture, and the front portion of the inspection cover 34 provided below the inspection cover 34 is provided with each front mounting bolt. A lower cover 35 that is detachably fastened using a front cover 40, and each hydraulic hose 31 of the offset front device 6 that is provided in the lower cover 35 in the vicinity of each front mounting bolt 40. And a guide member 42 for guiding the respective hydraulic hose 31 away toward the front mounting bolt 40 to Bumufuto portion 6A1 of the lower boom 6A.

  Accordingly, the inspection opening 33 is greatly opened to the vicinity of the lower boom 6A, so that the head portion 40A of the front mounting bolt 40 for attaching the front portion of the inspection cover 34 to the rising plate portion 37 of the lower cover 35 is provided for each hydraulic pressure. Even when the guide member 42 is disposed close to the hose 31, the slack portion 31 </ b> A of each hydraulic hose 31 can be prevented from hitting the head 40 </ b> A of each front mounting bolt 40 in advance. As a result, it is possible to make the inspection opening 33 large without worrying about damaging each hydraulic hose 31, and to improve the workability of inspection and maintenance of the power source such as the engine 10 and the alternator 11. Can do.

  A control valve group 22 is provided on the center frame 7 </ b> A of the revolving frame 7 so as to be positioned below the footrest member 15. Each hydraulic hose 31 of the offset front device 6 is guided to the lower side of the boom foot portion 6A1 of the lower boom 6A through the hose insertion hole 7B2 formed in the left front vertical plate 7B of the swivel frame 7, thereby The rear surface 6A2 of the lower boom 6A can be provided so as to extend toward the front end side through the front side.

  The lower cover 35 has a lower plate portion 36 extending forward and rearward on the lower side of the lower boom 6A of the offset front device 6, and a screw hole 37B in which a front mounting bolt 40 is fastened to the upper portion rising from the rear portion of the lower plate portion 36. And a right plate portion 39 extending from the right end edge of the rising plate portion 37 to the front side along the right front vertical plate 7C of the turning frame 7. On this, the rising plate portion 37 is provided with a guide member 42 located in the vicinity of the screw hole 37B. Further, the right plate portion 39 is a hose that restricts the hydraulic hose 31 from being pressed against the right front vertical plate 7C or the right plate portion 39 by the restoring force of each hydraulic hose 31 bent at the position of the hose insertion hole 7B2. A regulating member 43 is provided.

  Thereby, each hydraulic hose 31 is pressed against the right front vertical plate 7C or the right plate portion 39 of the lower cover 35 by the restoring force of each hydraulic hose 31 bent at the position of the hose insertion hole 7B2 of the left front vertical plate 7B. Even in this case, the hose restricting member 43 can restrict each hydraulic hose 31 from being pressed against the right front vertical plate 7C by contacting each hydraulic hose 31 and improve the durability of each hydraulic hose 31. be able to.

  The guide member 42 is positioned in the vicinity of the lower side of the front mounting bolt 40 and extends in the left and right directions, and is formed as a convex body in which at least a portion to which each hydraulic hose 31 hits has an arc shape. Also in this point, the durability of each hydraulic hose 31 can be improved.

  Further, the lower cover 35 and the guide member 42 are made of an iron-based metal material, and the guide member 42 is fixed to the lower cover 35 using welding means. As a result, the guide member 42 can be attached to the lower cover 35 with a simple configuration.

  In the embodiment, the guide member 42 made of a metal round bar is fixed to the rising plate portion 37 of the lower cover 35 using welding means. However, the present invention is not limited to this. For example, by forming the rising plate portion 37 by press molding, arc-shaped ridges extending in the left and right directions are formed, and the ridges are used as guide members. It is good.

  In the embodiment, the small hydraulic excavator 1 of the canopy specification provided with the canopy 44 that covers the upper side and the right side of the driver's seat 16 has been described as an example. However, the present invention is not limited to this, and may be applied to, for example, a small cab-type hydraulic excavator provided with a cab that covers the upper part and the periphery of the driver's seat.

DESCRIPTION OF SYMBOLS 1 Small hydraulic excavator 2 Lower traveling body 3 Turning apparatus 3A Turning wheel 4 Upper turning body 6 Offset front apparatus 6A Lower boom 6A1 Boom foot part 7 Turning frame 7A Center frame 7B Left front vertical plate 7B1, 7C1 Bracket 7B2 Hose insertion hole 7C Right front vertical plate 9 Counterweight 10 engine (power source)
11 Alternator (Power source)
12 Hydraulic pump (power source)
13 Heat exchanger (power source)
14 Driver seat base 15 Footrest member 22 Control valve group 23 Fuel tank (oil storage tank)
24 Hydraulic oil tank (oil storage tank)
26 Tank side cover 29, 30, 31 Hydraulic hose 33 Inspection opening 34 Inspection cover 34A Inclined plate portion 35 Lower cover 36 Lower plate portion 37 Rising plate portion 37B Screw hole 39 Right plate portion 40 Front mounting bolt (screw member)
42 Guide member 43 Hose restricting member O Turning center AA Center line

Claims (5)

A lower traveling body, an upper revolving body supported by the lower traveling body via a swivel device, and a plurality of hydraulic hoses that are provided on the upper revolving body so as to be able to move up and down and supply and discharge pressure oil to and from the actuator. Consisting of an offset front device extending through the back,
The upper swing body is
A swivel frame left, vertical plate of the right has been erected offset left, to the right the right from the turning center of the on cell pointer frame upper rotating body,
And the engine that has been kicked set on the upper side of the front Ki旋 times frame,
Wherein said pivoting driver's seat pedestal provided et the upper frame as located on the left side of the left vertical plate covers an upper side of the engine of the rotating frame,
And an oil storage tank mounted on the revolving frame positioned on the right side of the Bumufuto portion before Kio full set front device,
A tank side cover provided on the left side of the oil storage tank and extending in the front and rear directions along the right vertical plate of the swivel frame,
The upper swing body and the offset front device are, in an ultra-small swing type small hydraulic excavator capable of swinging within a vehicle width of the lower traveling body,
In order to check the engine , it is located behind the vertical plate of the swivel frame and is provided between the driver seat base and the tank side cover and is inclined to rise from the front side toward the rear side. An inspection opening opened in a state, and
An inspection cover comprising an inclined surface along which the boom and each hydraulic hose are provided when the inspection opening is detachably closed and the offset front device is lifted and folded into a very small turning posture.
A lower cover provided on the lower side of the inspection cover, wherein a front side portion of the inspection cover is detachably fastened using a screw member;
The hydraulic hoses that are provided in the lower cover and are located near the screw members are guided so that the hydraulic hoses of the offset front device are separated from the screw members toward the boom foot portion of the offset front device. A small hydraulic excavator comprising a guide member. The center frame of the swivel frame is provided with a control valve group located below a footrest member disposed on the front side of the driver seat base ,
Wherein each of the hydraulic hoses of the offset front device, wherein the rotating frame through the left vertical plate formed hose insertion hole from the lower side of the boot Muhu over preparative unit front the through with the boom of the lower cover The small hydraulic excavator according to claim 1, wherein the back surface extends toward the tip side. The lower cover has a lower plate part extending forward and rearward on the lower side of the boom of the offset front device, and a rising hole having a screw hole to which the screw member is fastened from the rear part of the lower plate part. A plate portion, and a right plate portion extending from the right end edge of the rising plate portion to the front side along the right vertical plate of the swivel frame,
The rising plate portion is provided with the guide member located in the vicinity of the screw hole,
A hose restricting member for restricting the hydraulic hose from being pressed against the right vertical plate or the right plate by the restoring force of each hydraulic hose bent at the position of the hose insertion hole. The small hydraulic excavator according to claim 2, wherein:   The guide member is located in the vicinity of the lower side of the screw member and extends left and right, and at least a portion to which the hydraulic hose hits is formed as a convex body having an arc shape. Item 4. A small hydraulic excavator according to Item 1.   The small hydraulic excavator according to claim 1, wherein the lower cover and the guide member are made of a ferrous metal material, and the guide member is fixed to the lower cover using welding means.

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