JP6369495B2 - Work machine - Google Patents

Description

  The present invention relates to a working machine such as a hydraulic excavator, and more particularly to a technique for attaching and detaching a boom foot pin.

  The hydraulic excavator is provided with an attachment composed of a bucket, an arm, a boom, and the like as a working device for performing work such as excavation at the front of the upper swing body. A pair of left and right support portions are erected on the upper swing body so as to face each other, and a boom foot pin is attached so as to extend in the vehicle width direction therebetween. By attaching the base end of the boom to the boom foot pin, the attachment is rotatably supported by the upper swing body.

  The boom foot pin is inserted / removed from / from the support portion when the attachment is exchanged. However, in a small model or the like, it is not easy to attach and detach the boom foot pin. That is, since the operator's cab is adjacent to one side of the support part, the boom foot pin is usually inserted and removed from the side of the other support part. However, since a fuel tank, a hydraulic oil tank, etc. are also arranged on the side of the other support portion, there is a problem of work space.

  Therefore, for example, Patent Document 1 proposes an invention in which the shape of the fuel tank is devised so that the boom foot pin can be inserted and removed without forming a useless space used only for the detaching operation.

  Moreover, in order to control the operation | movement of an attachment, the angle sensor which detects the angle of a boom may be installed in a hydraulic shovel (patent document 2). The angle sensor of Patent Document 2 is installed on the side surface near the base end of the boom, and the sensor part that rotates in conjunction with the rotation of the boom is attached to the frame via a link composed of a lever and a rod. It has been.

  The angle sensor is not easy to install because there is not enough space. Therefore, in the hydraulic excavator of Patent Document 3, the side surface of the cab is recessed so that the angle sensor can be installed.

JP 2003-253700 A JP 7-29053 A JP-A-8-284206

  In the case of the angle sensors of Patent Document 2 and Patent Document 3, since the boom angle is indirectly detected, the detection accuracy is not high. On the other hand, when the angle sensor is attached to the boom foot pin so that the boom and the rotation center of the sensor part coincide with each other, the angle can be directly detected, so that highly accurate detection is possible.

  However, in order to attach the angle sensor in such a manner, a space for accommodating the angle sensor is required outside the support portion. Therefore, as in Patent Document 3, the angle cannot be accommodated to the extent that the side surface of the cab is recessed. In addition, when the boom foot pin is attached / detached, the angle sensor must be removed from the boom foot pin, so that the operation is required not only on the fuel tank side but also on the cab side. Therefore, it is necessary to secure the work space also on the cab side, and the workability of attaching and detaching the boom foot pin is also deteriorated.

  Although it is conceivable that the boom foot pins should be removed from the cab side, the equipment is densely arranged in the cab, and there are many electrical components that require waterproofing, so it cannot be done easily. .

  In recent years, in particular, as hydraulic excavators have become more compact and the engine room has expanded relatively, the electrical equipment previously installed under the seat stand in the cab is now attached to the cab's attachment side. In such a case, it is more difficult to attach and detach the boom foot pin from the cab side.

  Accordingly, an object of the present invention is to provide a work machine that can easily attach and detach a boom foot pin from the cab side even when a large number of electrical components are installed on the attachment side of the cab.

  The work machine to be disclosed is such that a boom arranged side by side in the vehicle width direction with the driver's cab on the upper swinging body mounted on the lower traveling body can rotate around a boom foot pin extending in the vehicle width direction. It is a work machine that is pivotally supported.

  The upper swing body has a pair of support portions formed with bearing holes that pivotally support end portions of the boom foot pins at positions adjacent to the cab in the vehicle width direction.

The driver's cab includes a side wall portion in which a pin insertion / removal port that allows the boom foot pin to be attached / detached is formed, a group of electrical components disposed inside the side wall unit, the pin attachment / detachment port, and the electrical component. A cover member that is detachably attached to the side wall so as to cover the group, and the electrical component group is attached to an inner surface of the cover member.

  That is, according to this work machine, the pin attachment / detachment opening that enables the attachment / detachment of the boom foot pin is formed in the side wall portion of the cab, and the boom foot pin is configured to be attached / detached from the cab side. Yes. Therefore, the form and arrangement of the fuel tank installed on the opposite side of the operator's cab need not be taken into consideration when the boom foot pin is attached and detached, and can be designed freely.

  And since the electrical component group disposed inside the side wall portion is attached to the inner side surface of the cover member, the electrical component group can be removed from the side wall portion together with the cover member, and the boom foot pin can be detached and attached. Work can be done easily.

  In particular, when one end portion of the boom foot pin is located inside the side wall portion through the pin attachment / detachment port, the electrical component group is one of the boom foot pins when viewed from the vehicle width direction. It is preferable to arrange so as not to overlap with the end of the vehicle in the vehicle width direction. If it does so, the thickness of a cover member can be made small and it can avoid pressing a driver's cab.

  As a more preferred example, an angle sensor is provided that detects the angle of the boom by rotating the rotating portion in conjunction with the rotation of the boom. The angle sensor is located inside the side wall portion through the pin attachment / detachment opening, and one end of the boom foot pin is in a state where the rotation centers of the rotation portion and the boom foot pin are aligned with each other. And a base end portion of the boom.

  In such a case, since the rotating part rotates at the same angle as the boom rotating angle, the angle of the boom can be detected with high accuracy, and the angle sensor is positioned inside the side wall part through the pin attachment / detachment port. Therefore, the angle sensor and the boom foot pin can be easily attached and detached.

  More specifically, a partition member that partitions between the electrical component group and the angle sensor is provided inside the cover member.

  In such a case, it is possible to prevent the electrical component group from being exposed to rainwater or earth and sand even if the angle sensor that requires an opening that leads to the outside of the cab is housed in the cover member together with the electrical component group. .

  More specifically, each electrical wiring of the electrical component group is led out to the outside through a single harness attached to the inner surface of the cover member.

  In such a case, since the cover member can be moved by utilizing the bending of the harness, a space for performing the attaching / detaching operation of the angle sensor and the boom foot pin can be easily secured.

  According to the work machine of the present invention, even when a large number of electrical components are installed on the attachment side of the cab, the boom foot pin can be easily attached and detached from the cab side.

It is a schematic perspective view which shows the hydraulic excavator of embodiment. It is a schematic plan view of an upper frame. It is a disassembled perspective view of a boom foot pin and an angle sensor. It is a schematic perspective view in the state where a boom foot pin and an angle sensor are attached. It is a schematic perspective view which shows the inside of a side cover. It is the schematic which shows arrangement | positioning of the main members inside a side cover.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. However, the following description is merely illustrative in nature and does not limit the present invention, its application, or its use. In addition, directions such as front and rear, right and left, and up and down used in the description are based on the upper swing body 3 and follow the arrows shown in the figure.

  FIG. 1 shows a hydraulic excavator 1 (an example of a work machine) according to the present embodiment. The hydraulic excavator 1 is a small model designed to have a small turning radius, and includes a crawler type lower traveling body 2 and an upper turning body 3 that is turnably mounted thereon. At the front of the lower traveling body 2, a dozer 2a that can be raised and lowered is equipped.

  The upper swing body 3 includes an upper frame 10, an attachment 20, a cab 30, a machine room 40, and the like. The upper frame 10 is supported by the lower traveling body 2, and the attachment 20, the cab 30, the machine room 40, and the like are disposed on the upper frame 10.

  As shown in FIG. 2, the upper frame 10 includes a bottom plate 11, a pair of vertical plates 12, 12, a beam plate 13, a panel member 14, and the like. The bottom plate 11 is made of a substantially circular metal plate, and is supported on the lower traveling body 2 via a swivel bearing (not shown). The pair of vertical plates 12 and 12 are erected on the front portion of the bottom plate 11 at a predetermined interval, and extend in the front-rear direction so as to face in the left-right direction (vehicle width direction). The beam plates 13 are erected at various locations on the bottom plate 11 and structurally strengthen the upper swing body 3 together with the vertical plate 12. The panel member 14 that is an exterior material is disposed on the left and right edges of the bottom plate 11.

  The attachment 20 is disposed at a position on the right side of the front part of the upper swing body 3. In the case of the hydraulic excavator 1, the attachment 20 includes a bucket, an arm, a boom 21, a hydraulic cylinder 22, and the like, and can perform operations such as excavation work by expanding and contracting the hydraulic cylinder 22 (bucket and arm). (The illustration is omitted).

  The boom 21 constituting the base end portion of the attachment 20 is pivotable about the upper frame 10 around a boom foot pin 25 extending in the left-right direction so that the attachment 20 can be moved up and down. It is supported. The attachment 20 can be exchanged according to the work content, and the attachment 20 can be detached from the upper frame 10 by removing the boom foot pin 25.

  In addition, in order to control the operation of the boom 21, an angle sensor 50 that enables highly accurate detection of the angle of the boom 21 is attached to the boom foot pin 25 (boom foot pin). The details of the angle sensor 25 and the angle sensor 50 will be described later.

  A cab 30 is arranged on the left side of the front part of the upper swing body 3, and the boom 21 and the cab 30 are aligned in the left-right direction. Operations such as turning of the upper turning body 3, running of the crawler, raising and lowering of the dozer 2 a, and working operation of the attachment 20 are performed in this cab 30.

  The cab 30 of the hydraulic excavator 1 has a structure in which a right side portion and an upper side portion thereof are partitioned by a side wall portion 31 and a hood 32, and front and rear and left side portions thereof are open to the outside (canopy). ). A large window 31 a is formed in the upper part of the side wall portion 31 in order to ensure the right working field of view. On the left side of the cab 30 is provided a boarding gate through which an operator gets on and off the cab 30.

  A floor panel 33 is laid on the lower part of the front of the cab 30, and a traveling lever 34, an operation pedal 35, and the like are disposed on the front part. The floor panel 33 is disposed above the bottom plate 11 of the upper frame 10, and although not shown, various types of control valves such as a control valve connected to the travel lever 34 and the like are provided between the floor panel 33 and the bottom plate 11. Along with the device, electrical wiring, hydraulic piping, and the like are arranged together.

  A trapezoidal seat stand 36 is installed behind the floor panel 33, and a seat 37 on which an operator is seated is installed on the top. On both sides of the seat 37, control boxes 38 having operation levers and various switches are arranged.

  On the right side of the front portion of the cab 30, an electrical component storage portion covered with a side cover 61 (cover member) is disposed along the inside of the side wall portion 31. In the electrical component storage unit, a plurality of electrical transmission items are collectively arranged (details will be described later).

  A machine room 40 covered with a cover is disposed on the right side and the rear of the upper swing body 3. A counterweight 41a made of a high-weight casting that also serves as a cover is installed at the rear edge of the upper swing body 3 in order to ensure a front-rear balance.

  The machine room 40 located at the rear part of the upper swing body 3 is an engine room, and an engine 41, a hydraulic pump 42, a radiator 43, and the like are densely arranged therein as indicated by a virtual line in FIG. It is installed at. In view of space, a part of the engine room is in a state of entering the lower side of the seat stand 36.

  On the other hand, in a machine room 40 (also referred to as a side machine room 40) located on the right side of the upper swing body 3, a fuel tank 44, a hydraulic oil tank 45, a battery 46, and the like are arranged densely. The fuel tank 44 and the hydraulic oil tank 45 are disposed along the right vertical plate 12 in a state of being close to each other in the front-rear direction. The battery 46 is placed on the fuel tank 44.

(Boom foot pin 25, angle sensor 50)
As shown in FIG. 2, a pair of vertical plates 12, 12 are positioned adjacent to each other between the side machine room 40 and the cab 30, and the boom 21 is moved by these vertical plates 12, 12. A supporting portion for supporting is configured.

  Specifically, a bearing hole 15 is formed in each vertical plate 12 so as to face in the left-right direction. As shown in phantom lines in FIG. 2, a shaft hole 21a penetrating in the left-right direction is formed in the base end portion of the boom 21, and the boom foot pin 25 is inserted into the shaft hole 21a in a rotatable state. Has been. Then, with the base end portion disposed between the pair of vertical plates 12, 12, end portions of the boom foot pins 25 projecting from the left and right of the base end portion are pivotally supported in the respective bearing holes 15.

  The boom foot pin 25 is configured to be detached from the left side where the cab 30 is located.

  Specifically, as shown in FIGS. 3 and 4, one end of the boom foot pin 25 (the left end to be detached) has a flange-like rotation that restricts the rotation of the boom foot pin 25. A stop portion 26 is provided, and an insertion portion 25 a to be inserted into the right bearing hole 15 is provided at the other end portion of the boom foot pin 25. Therefore, when the boom foot pin 25 is attached, the insertion portion 25a is inserted from the left bearing hole 15 and inserted into the shaft hole 21a of the boom 21, and then the insertion portion 25a is inserted into the right bearing hole 15. Let it pivot.

  In this state, the left end portion of the boom foot pin 25 protrudes laterally from the left vertical plate 12, and the anti-rotation portion 26 is configured to be close to the left side surface thereof. Is fixed to a fastening seat 12 a provided on the left side surface of the vertical plate 12 with a bolt, so that the boom foot pin 25 is non-rotatably attached to the pair of vertical plates 12 and 12. When removing the boom foot pin 25, the boom foot pin 25 can be extracted from the left side where the cab 30 is located by performing the operation in the reverse order.

  Since the boom foot pin 25 is detached from the cab 30 side, the form and arrangement of the fuel tank 44 and the hydraulic oil tank 45 installed in the side machine room 40 can be freely designed.

  An angle sensor 50 that enables highly accurate detection is attached using the rotation stopper 26.

  The angle sensor 50 includes a cover bracket 51, a support bracket 52, a sensor main body 53, a connection bracket 54, and the like. The cover bracket 51 is a plate-like member in which an arc-shaped slit 51 a is formed, and is fastened and fixed to the rotation stopper 26 together with the support bracket 52. Although omitted in FIG. 3, rubber seals 51b are attached to both sides of the edge of the cover bracket 51 (see FIG. 4).

  The sensor body 53 is a detector having a rotating portion 53a that detects an angle by rotating, and is supported so that the rotation center of the rotating portion 53a coincides with the rotation center of the boom foot pin 25. The bracket 52 is fastened and fixed. The sensor body 53 is provided with a cable having a plug 53b at the tip. The connecting bracket 54 is a member that is attached to the rotating portion 53a and rotates integrally with the rotating portion 53a, and the distal end is connected to the connecting portion 21b provided at the base end portion of the boom 21 through the slit 51a. It has a shaped rod 54a. In addition, the boom 21 of FIG.3,4,6 is the state of the virtual line in FIG.

  Accordingly, in the case of this angle sensor 50, the rod 54a swings in conjunction with the rotation of the boom 21, and the rotation portion 53a rotates at the same angle as the rotation angle of the boom 21, so the angle of the boom 21 is set. It can be detected with high accuracy.

  The end of the boom foot pin 25 including the rotation stoppers 26 and the angle sensor 50 are disposed on the cab 30 side, and the boom foot pin 25 is attached and detached on the cab 30 side. In addition, in the case of the hydraulic excavator 1, an electrical component storage unit is disposed in the portion of the operator cab 30 that is the target of these.

(Side 31 and side cover 61)
Therefore, the rotation preventing portion 26 and the angle sensor 50 can be appropriately arranged without adversely affecting the electrical components stored in the electrical component storage portion, and the boom foot pin 25 and the angle sensor 50 can be easily attached and detached. The side wall part 31 and the side cover 61 are devised so that it can do.

  Specifically, the outer surface of the side wall portion 31 is close to the side surface of the left vertical plate 12, and the side wall portion 31 is opened along the side surface of the vertical plate 12 as shown in FIGS. 3 and 4. In addition, a pin attachment / detachment opening 62 that allows the boom foot pin 25 to be attached / detached is formed. A part of the left vertical plate 12 including the bearing hole 15 and a part of the base end portion of the boom 21 are exposed to the inside of the cab 30 through the pin attachment / detachment port 62.

  Thereby, the end portion of the boom foot pin 25 including the rotation preventing portion 26 and the angle sensor 50 are accommodated in the electrical component accommodating portion inside the side wall portion 31 through the pin attaching / detaching port 62. Therefore, it is not necessary to provide a space between the vertical plate 12 and the cab 30 to accommodate them. A seal 62a is attached to the upper edge of the pin attaching / detaching port 62, and the gap between the vertical plate 12 and the side wall portion 31 is closed by the seal 62a. That is, a part of the pin attachment / detachment port 62 is closed by the vertical plate 12.

  In the upper part of the pin attachment / detachment opening 62, an opening 63 is secured that allows the rod 54a connected to the base end of the boom 21 to swing. The opening 63 is closed by the cover bracket 51 when the angle sensor 50 is attached. Therefore, when the boom foot pin 25 and the angle sensor 50 are attached, most of the pin attachment / detachment port 62 is closed except for the slit 51a.

  FIG. 5 shows the inside of the side cover 61 that covers the electrical component storage unit. The side cover 61 is attached to the side wall portion 31 so as to be removable so as to cover the pin attachment / detachment port 62. A plurality of electrical components (electrical component groups 65 a, 65 b, 65 c) accommodated in the electrical component storage unit, such as the mechatronics controller 65 a, various relays 65 b, and the fuse box 65 c, are covered by the side cover 61. It is attached to the inside surface.

  A partition member 66 is also attached to the inner side surface of the side cover 61. The partition member 66 is a tray-like member having a polygonal bottom surface 66a corresponding to the outer shape of the cover bracket 51 and a side surface 66b erected along the edge of the bottom surface 66a. The partition member 66 is assembled at a predetermined position on the rear portion of the side cover 61 so that the rubber seal 51b of the cover bracket 51 is fitted when the side cover 61 is attached to the side wall portion 31.

  Accordingly, since the electrical component group 65a, 65b, 65c and the end of the boom foot pin 25 including the rotation preventing portion 26 and the angle sensor 50 are partitioned by the partition member 66, the cab 30 is provided through the slit 51a. Even if the angle sensor 50 communicating with the outside is accommodated in the electrical component storage unit, the electrical component group 65a, 65b, 65c can be prevented from being exposed to rainwater or earth and sand.

  As shown in FIG. 6, when viewed from the vehicle width direction, the electrical component groups 65 a, 65 b, 65 c do not overlap with the end of the boom foot pin 25 including the rotation stopper 26 and the angle sensor 50 in the left-right direction. Further, they are arranged along the inner side surface of the side cover 61. Thereby, the thickness (the size in the left-right direction) of the side cover 61 can be reduced, and the operation space is not compressed by overhanging the inside of the cab 30.

  In particular, the electrical component groups 65a, 65b, and 65c are arranged on the side or upper side of the partition member 66, avoiding the lower side of the partition member 66, so that exposure to rainwater and earth and sand can be further prevented. It has become.

  Since the electrical component groups 65 a, 65 b, and 65 c are attached to the side cover 61, the electrical component groups 65 a, 65 b, and 65 c can be detached from the side wall portion 31 together with the side cover 61.

  Moreover, the electrical wiring 67 connected to each of the electrical component groups 65a, 65b, and 65c is attached to the inner surface of the side cover 61 so that the angle sensor 50 and the boom foot pin 25 can be easily attached and detached. It is led out through one harness 68.

  That is, one harness 68 is routed from the rear of the electrical component storage unit to the electrical component storage unit, and the rear end portion of the side cover 61 remains in a state where the leading end portion of the harness 68 leaves a bending allowance. It is fixed to. And the connection part 68a branched in plurality is provided in the front-end | tip part of the harness 68, and the electrical wiring 67 of the electrical equipment group 65a, 65b, 65c is connected to the connection part 68a. A cable having a connector 67a to which the plug 53b of the sensor main body 53 is detachably connected is also connected to the connecting portion 68a.

  Accordingly, when the boom foot pin 25 is attached and detached, the side cover 61 is removed from the side wall portion 31, and the plug 53b of the angle sensor 50 is removed from the connector 67a. Then, by using the bending allowance of the harness 68 and simply moving the side cover 61 on the floor panel 33 or the like, a space for performing the attaching / detaching operation of the angle sensor 50 and the boom foot pin 25 is secured. be able to.

  Moreover, since the space above the floor panel 33 is an operation space, a sufficient work space can be secured, and the left side of the cab 30 is open to the outside.

  Therefore, the attaching / detaching operation of the angle sensor 50 and the boom foot pin 25 can be easily performed from the cab 30 side.

  In addition, the working machine according to the present invention is not limited to the above-described embodiment, and includes various other configurations. For example, the work machine may be a crane or the like. The cab 30 may be a cab that is surrounded by panels and doors around the driving space. The angle sensor 50 is sufficient if it is attached to the end of the boom foot pin 25, and does not necessarily have to be attached to the rotation stopper 26.

DESCRIPTION OF SYMBOLS 1 Hydraulic excavator 2 Lower traveling body 3 Upper turning body 10 Upper frame 12 Vertical plate (support part)
15 Bearing hole 21 Boom 21a Shaft hole 25 Boom foot pin 26 Anti-rotation part 30 Driver's cab 31 Side wall part 50 Angle sensor 61 Side cover (cover member)
62 Pin removal port 65a Mechatronics controller 65b Relay 65c Fuse box

Claims (2)

A boom arranged side by side in the cab and the vehicle width direction is pivotally supported around a boom foot pin extending in the vehicle width direction on the upper swing body mounted on the lower traveling body , a work machine that have a angle sensor for detecting an angle of the boom,
The upper swing body has a pair of support portions formed with bearing holes that pivotally support end portions of the boom foot pins at positions adjacent to the cab and the vehicle width direction,
The cab is
A side wall portion in which a pin insertion / removal opening that allows the boom foot pin to be removed is formed;
A group of electrical components disposed inside the side wall;
A cover member mounted in a removable state on the side wall so as to cover the pin attachment / detachment port and the electrical component group;
Have
The angle sensor has a rotation unit that detects the angle of the boom by rotating in conjunction with the rotation of the boom.
One end portion of the boom foot pin is located inside the side wall portion through the pin attachment / detachment port, and is arranged so as not to overlap the electrical component group in the vehicle width direction when viewed from the vehicle width direction. And
The angle sensor is located inside the side wall portion through the pin attachment / detachment opening, and one end of the boom foot pin is in a state where the rotation centers of the rotation portion and the boom foot pin are aligned with each other. And the base end of the boom,
A work machine in which the electrical component group and a partition member that partitions the electrical component group and the angle sensor are attached to an inner surface of the cover member. The work machine according to claim 1,
A work machine in which each electrical wiring of the electrical component group is led out to the outside through a single harness attached to an inner surface of the cover member.

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