JP2013238075A - Work machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a pipeline support structure of a hydraulic cylinder installed in an attachment.SOLUTION: An attachment 7 which performs working operation under hydraulic control includes a hydraulic cylinder 15 installed in strut members 12, 13. The hydraulic cylinder 15 includes a cylinder body 21, a pair of hydraulic pipelines 22, 22 connected to a hydraulic hose 23, and a support member 30 supporting them. The support member 30 includes a fastening band part 31, and a pair of clamp parts 41, 41 clamping the hydraulic pipeline 22. The pair of clamp parts 41, 41 protrude from the fastening band part 31 toward the radially outside while being reversed to each other.

Description

  The present invention relates to a work machine such as a hydraulic excavator, and more particularly to a piping support structure for a hydraulic cylinder installed in an attachment.

  This type of support structure is disclosed in Patent Document 1 and Patent Document 2, for example.

  In Patent Document 1, a bracket is welded to a side surface of a hydraulic cylinder, and a fall prevention valve connected to the hydraulic piping is fixed to the hydraulic cylinder via the bracket.

  In patent document 2, the functional valve connected to hydraulic piping is attached to the offset cylinder using a fastening band.

JP 2001-295810 A JP 2000-64345 A

  When the bracket is welded to the hydraulic cylinder as in Patent Document 1, it takes time for welding work and the bracket is fixed to the hydraulic cylinder, so that it is difficult to align with the hydraulic piping.

  In that respect, if it uses a fastening band like patent document 2, attachment work will be easy, and if fastening is loosened, since a fastening band can be moved, alignment with hydraulic piping is also easy.

  Therefore, the fastening band is often used when supporting the pipe on the hydraulic cylinder.

  However, when the pipe is supported on the hydraulic cylinder using the fastening band, the support position of the pipe may be shifted over time. This point will be specifically described with reference to FIGS.

  FIG. 1 shows an example of a conventional hydraulic excavator. The illustrated hydraulic excavator 100 is a model that can swing the arm 101 and the bucket 102 left and right. In the hydraulic excavator 100, the boom 103 includes a lower boom 103a, an offset boom 103b, and an upper boom 103c, and the offset boom 103b swings left and right.

  The arm 101 is provided with a bucket cylinder 104 that drives the bucket 102, and the upper boom 103c is provided with an arm cylinder 105 that drives the arm 101. The hydraulic pipes 106 and the like connected to the hydraulic cylinders 104 and 105 are routed inside the arm 101 and the boom 103 as indicated by arrows (broken lines) in the drawing.

  FIG. 2 shows the bucket cylinder 104. As shown in the figure, oil supply ports 104b are provided at both ends of the cylinder body 104a, and a hydraulic pipe 106 (steel pipe) connected to a hydraulic hose 107 extending from the boom 103 side is provided at each oil supply port 104b. It is connected. Each hydraulic pipe 106 is supported on the cylinder body 104a by a clamp member 108.

  As shown in FIG. 3, the clamp member 108 includes a clamp portion 108a and a fastening band portion 108b. The fastening band portion 108b is attached to the cylinder body 104a, and the hydraulic pipe 106 is sandwiched between the clamp portions 108a. The cross section of the cylinder body 104a is shown in a simplified manner.

  As indicated by an arrow (solid line) in FIG. 1, the arm 101 swings during the operation, so that the hydraulic hose 107 is bent and deformed along with the operation. As a result, a repetitive force is applied to the hydraulic pipe 106 to which the hydraulic hose 107 is connected in the direction indicated by the arrow in FIG.

  As a result, as shown by arrows in FIG. 3, the fastening band portion 108b rotates in the circumferential direction of the cylinder body 104a with time, and the support position of the hydraulic pipe 106 is displaced. If the support position of the hydraulic pipe 106 is shifted, the hydraulic pipe 106 may be deformed or poorly connected to the oil supply port 104b. The same problem may occur not only in the bucket cylinder 104 but also in the arm cylinder 105.

  Accordingly, an object of the present invention is to improve the piping support structure of this type of hydraulic cylinder so that it can be easily attached and can prevent displacement.

  The work machine according to the present invention is a work machine in which a machine body is installed on a lower traveling body. The machine body includes an attachment that performs a work operation by hydraulic control, and the attachment includes a plurality of support members that are swingably connected to each other, and a hydraulic cylinder that is installed on the support member. . The hydraulic cylinder has a pair of hydraulic pipes each having a cylindrical cylinder body provided with two oil supply ports, one end connected to each of the oil supply ports, and the other end connected to a hydraulic hose extending from the machine body side. And a support member attached to the cylinder body and supporting the pair of hydraulic pipes.

  The support member includes an annular fastening band portion that is fastened and attached to the outer periphery of the cylinder body, and a pair of clamp portions that sandwich each of the pair of hydraulic pipes, and the pair of clamp portions However, it protrudes in the mutually opposite direction toward the outer side of the radial direction from the said fastening band part.

  That is, according to the work machine configured as described above, the hydraulic hose extending from the machine main body side repeatedly bends and deforms as the support member swings, but a pair of hydraulic hoses connected to the hydraulic hose are supported. Since the clamp portion protrudes in the opposite direction from the cylinder body, the moment of force acting on each hydraulic pipe is offset. Since the timing and magnitude of the force acting on both hydraulic pipes are substantially the same, almost no force is generated to rotate the fastening band portion. Therefore, the shift of the support position of the hydraulic pipe over time can be prevented, and the hydraulic pipe can be stably supported.

  Since the support member is attached to the cylinder main body by the fastening band portion, the support member can be easily attached and the attachment position can be easily adjusted.

  Specifically, the hydraulic piping is fastened to the oil filler port by screwing in the direction in which the cylinder body extends. A first pipe portion extending along the cylinder body and a second pipe portion fastened to the hydraulic hose and extending in a direction intersecting the first pipe portion. The second pipe part is supported by the clamp part.

  In this case, there is an advantage that the mounting workability of the hydraulic piping is excellent. That is, when attaching the hydraulic piping to the cylinder body, the fastening is performed after temporarily fixing the support member and each hydraulic piping. First, the first pipe part of one hydraulic pipe is screwed in the direction in which the cylinder body extends and is finally tightened. However, in this work machine, the second pipe part extending in the direction intersecting the first pipe part is sandwiched. Therefore, the rotation of the hydraulic piping can be prevented. Accordingly, the first pipe portion can be easily finally tightened to the fuel filler port without causing a positional shift.

  As a result of sandwiching the second pipe portion and preventing the rotation of the hydraulic piping, a force to rotate the fastening band portion acts, but the hydraulic piping is temporarily fixed on the opposite side, so the fastening band portion Can also be prevented.

  More specifically, the support member is composed of a pair of element members fastened to each other. Each of the element members includes the clamp part and a band element that constitutes the fastening band part. The band element includes an arc-shaped tightening portion and fastening portions provided at both ends of the tightening portion. And the elongate hole for fastening extended in parallel with the said cylinder main body is formed in the said fastening part when it attaches to the said cylinder main body.

  In this case, there is an advantage that the mounting workability of the hydraulic piping is further excellent. That is, normally, since the tightening amount of the hydraulic piping to the oil filler varies, the distance from the oil filler to the second pipe portion is not constant. Accordingly, if the positions of both clamp parts are constant, the second pipe part cannot be clamped when the clamping positions of both hydraulic pipes are shifted.

  On the other hand, in this work machine, each of the two element members constituting the fastening band portion is provided with a clamp portion, and a long hole extending in parallel with the cylinder body is formed in the fastening portion. The position of both clamp parts can be adjusted by shifting the element member in the direction in which the cylinder body extends by the length. Therefore, even when the clamping positions of both hydraulic pipes are shifted, the second pipe part can be clamped without hindrance.

  ADVANTAGE OF THE INVENTION According to this invention, regarding the piping support structure of the hydraulic cylinder installed in the attachment, it can attach easily and can also prevent position shift.

It is a schematic perspective view which shows an example of the conventional hydraulic shovel. It is the schematic which shows the hydraulic piping installed in the hydraulic shovel of FIG. It is the schematic sectional drawing seen from the AA line in FIG. It is a schematic perspective view which shows an example of the hydraulic shovel of this embodiment. It is the schematic which shows the hydraulic piping installed in the hydraulic shovel of FIG. It is a schematic perspective view which shows the support structure of the hydraulic shovel of FIG. It is a disassembled perspective view of the support structure of FIG. It is the schematic sectional drawing seen from the BB line in FIG. It is a schematic perspective view which shows the modification of a support structure. It is a schematic perspective view which shows the modification of a support structure.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. For convenience, unless otherwise stated, directions such as front, rear, left and right used in the description follow the arrows shown in FIG.

  FIG. 4 shows a hydraulic excavator 1 (an example of a work machine) to which the present invention is applied. The hydraulic excavator 1 is provided with a crawler type lower traveling body 2 and a machine main body 3 installed thereon. The machine body 3 includes a frame 4 that is pivotally supported by the lower traveling body 2, a cab 5, a machine room 6, and an attachment 7 that are installed on the frame 4.

  The cab 5 is a box-shaped cab in which an operator gets in, and the machine bay 6 accommodates a driving device and hydraulic equipment for driving the lower traveling body 2 and the attachment 7. The attachment 7 is a working device that performs a work operation by hydraulic control, and includes a bucket 11, an arm 12, a boom 13, and the like.

  The bucket 11 is a container-like working member that performs excavation and the like, and the arm 12 and the boom 13 are support members that support the bucket 11. In the case of this model, the boom 13 includes a lower boom 13a, an offset boom 13b, and an upper boom 13c.

  The proximal end portion of the bucket 11 is pivotally supported by the distal end portion of the arm 12, and the proximal end portion of the arm 12 is pivotally supported by the distal end portion of the upper boom 13c. The base end portion of the upper boom 13c is pivotally supported by the tip end portion of the offset boom 13b, and the base end portion of the offset boom 13b is pivotally supported by the tip end portion of the lower boom 13a. The base end portion of the lower boom 13 a is pivotally supported on a vertical plate 4 a provided on the frame 4.

  The bucket 11, the arm 12 and the lower boom 13a rotate about a rotation axis J1 extending in the left-right width direction of the machine body 3, and the offset boom 13b and the upper boom 13c rotate about a rotation axis J2 extending in the vertical direction. Move.

  A hydraulic cylinder 15 is installed on a support member such as the arm 12. Specifically, a bucket cylinder 15A that drives the bucket 11 is installed on the arm 12, an arm cylinder 15B that drives the arm 12 is installed on the upper boom 13c, and an offset cylinder 15C that drives the offset boom 13b is installed on the arm 12. It is installed inside the offset boom 13b. A boom cylinder 15 </ b> D that drives the boom 13 is installed in the frame 4.

  The bucket 11 and the like operate according to the expansion and contraction operation of the bucket cylinder 15A and the like. Specifically, the bucket 11, the arm 12, and the lower boom 13a are linked to the expansion and contraction operations of the bucket cylinder 15A, the arm cylinder 15B, and the boom cylinder 15D. Swing up and down. The offset boom 13b and the upper boom 13c are swung right and left with the base end portion as a fulcrum in conjunction with the expansion / contraction operation of the offset cylinder 15C.

  A plurality of hydraulic pipes 16 and the like extending from the machine room 6 are routed through the inside of the boom 13 and the arm 12, and connected to the bucket cylinder 15A and the arm cylinder 15B as shown by arrows (broken lines) in FIG. Yes.

  FIG. 5 shows an enlarged view of the bucket cylinder 15A. The bucket cylinder 15 </ b> A includes a cylinder body 21 having a columnar appearance, a pair of hydraulic pipes 22 and 22, a support member 30, and the like. The configuration of the arm cylinder 15B is the same.

  The cylinder main body 21 is a part having a known piston structure, and includes a cylindrical cylinder casing 21a and a piston rod 21b accommodated in the cylinder casing 21a so as to freely enter and exit. A shaft support 21c connected to the support arm 12 is provided at the base end of the cylinder housing 21a, and a shaft support 21d connected to the drive bucket 11 is provided at the tip of the piston rod 21b. It has been. Each end portion of the cylinder housing 21a is provided with an L-shaped oiling port 21e that opens in the direction in which the cylinder body 21 extends, and a hydraulic pipe 22 is connected to the opening of these oiling ports 21e.

  Each of the hydraulic pipes 22 is made of a steel pipe, is connected to the first pipe part 22a via the first pipe part 22a extending along the cylinder body 21, and the bent part 22b, and extends in a direction intersecting the first pipe part 22a. And a second pipe portion 22c. The end on the first pipe portion 22a side is connected to each oil supply port 21e. Specifically, the first pipe portion 22a is fastened to the oil supply port 21e by screwing in the direction in which the cylinder body 21 extends. The end on the second pipe portion 22c side is connected to a hydraulic hose 23 extending from the arm 12 side.

  The pair of hydraulic pipes 22, 22 are located on both sides of the cylinder body 21 so as to sandwich the cylinder body 21 therebetween, and the second pipe portion 22 c of each hydraulic pipe 22 is located at an intermediate portion of the cylinder body 21. doing. The ends on the second pipe portion 22 c side are located on both sides of the cylinder body 21 so as to be symmetric with respect to the cylinder body 21.

  As shown in FIGS. 5 and 6, both the second pipe portions 22 c are arranged substantially in parallel with their end portions facing in the same direction facing the arm 12 side. And these 2nd pipe parts 22c are supported by the supporting member 30 attached to the cylinder main body 21. As shown in FIG.

  The support member 30 has a fastening band portion 31 and a pair of clamp portions 41. The fastening band portion 31 has an annular appearance, and is fastened and attached to the outer periphery of the cylinder body 21. Each hydraulic pipe 22 is clamped by a clamp part 41.

  As shown in detail in FIGS. 7 and 8, the support member 30 includes a pair of element members 33 and 33 fastened to each other. In this embodiment, the same member is used for both element members 33 so that it can be shared. Each element member 33 has a band element 34 constituting the fastening band portion 31 and one clamp portion 41. In addition, the cross section of the cylinder main body 21 of FIG. 8 is simplified.

  The band element 34 includes an arc-shaped fastening portion 35 formed by bending a belt-shaped steel plate, and hook-like fastening portions 36 provided at both ends of the fastening portion 35, specifically, a first fastening portion 36 a and a second fastening portion 36. A fastening portion 36b is provided. A long hole 38 for fastening is formed in the first fastening portion 36a, and a round hole 37 for fastening to which the nut N is joined is formed in the second fastening portion 36b. The long hole 38 is formed to extend in parallel with the cylinder body 21 when attached to the cylinder body 21.

  The band elements 34 of the element members 33 are abutted against each other so that the outer periphery of the cylinder housing 21a is sandwiched between the first fastening portion 36a and the second fastening portion 36b. The first fastening part 36a and the second fastening part 36b are fastened by fastening the bolt B inserted into the round hole 37 and the long hole 38 to the nut N. By doing so, the fastening portion 35 is pressure-bonded to the cylinder body 21, and the fastening band portion 31 is attached to the cylinder body 21.

  The clamp part 41 includes a bracket part 42, a clamp member 43, and the like. The bracket portion 42 is made of a metal piece having a gate-shaped cross section in which a fastening hole 42 a is formed on the upper wall surface, and both leg wall portions are fixed to the outer peripheral surface of the tightening portion 35. The clamp member 43 is a block-like member, and includes a clamp base portion 44 in which a bolt insertion hole 44a is formed, and an overhanging arm portion 45 protruding from the clamp base portion 44 in a direction orthogonal to the bolt insertion hole 44a. Yes.

  The clamp member 43 is supported by the bracket portion 42 in a cantilever manner by screwing the bolt B inserted into the bolt insertion hole 44 a into the fastening hole 42 a of the bracket portion 42. By inserting the hydraulic pipe 22 between the bracket part 42 and the overhanging arm part 45 and tightening the bolt, the second pipe part 22c is connected to the overhanging arm part 45 and the bracket part from the inside and outside in the radial direction of the cylinder body 21. 42.

  When both element members 33 and 33 are attached to the cylinder body 21, the pair of clamp portions 41 and 41 are configured to protrude in the opposite directions from the fastening band portion 31 toward the outer side in the radial direction.

  In addition, in this embodiment, although both the clamp parts 41 and 41 are comprised so that it may protrude in the opposite direction, it is not necessary to be in the opposite direction. As shown in FIG. 8, at least the clamp portions 41 only need to be located on both sides of the diameter line D of the cylinder body 21 extending in the swing direction of the arm 12 in the cross section.

  Since the arm 12 swings during the operation, the hydraulic hoses 23 and 23 connected to both the hydraulic pipes 22 and 22 are repeatedly bent and deformed with the operation of the arm 12. At that time, a repetitive force acts on each hydraulic pipe 22 in the direction indicated by the arrow in FIG. 8 due to the repulsive force of the hydraulic hose 23.

  In this hydraulic excavator 1, the pair of clamp parts 41, 41 that support the hydraulic pipe 22 protrude in the opposite direction from the cylinder body 21, so that the moment of force acting on each hydraulic pipe 22 is offset. The Since the timing and magnitude of the force acting on both hydraulic pipes 22 and 22 are substantially the same, the force for rotating the fastening band portion 31 hardly occurs. Therefore, the hydraulic piping 22 can be stably supported without the support position of the hydraulic piping 22 being shifted over time.

  Since the support member 30 is attached to the cylinder main body 21 by the fastening band portion 31, it can be easily attached and the attachment position can be easily adjusted.

  Moreover, in the case of the present embodiment, there is an advantage that the workability of attaching the hydraulic pipe 22 is excellent. That is, when the hydraulic piping 22 is attached to the cylinder body 21, the support member 30 and each hydraulic piping 22 are temporarily fixed in a predetermined mounting state, and then final tightening is performed.

  In the final tightening, first, the first pipe portion 22a of one hydraulic pipe 22 is finally tightened to the fuel filler port 21e. At this time, the first pipe portion 22a is screwed in the direction in which the cylinder body 21 extends. Therefore, as in the conventional model shown in FIGS. 1 to 3, if the hydraulic pipe 22 extending along the cylinder body 21 is sandwiched from the direction orthogonal to the cylinder body 21, the hydraulic pipe 22 is turned. Workability is poor.

  On the other hand, in this hydraulic excavator 1, since the second pipe portion 22c extending in the direction intersecting with the first pipe portion 22a is sandwiched, the rotation of the hydraulic pipe 22 can be prevented. Accordingly, the first pipe portion 22a can be easily finally tightened to the fuel filler opening 21e.

  In this case, the rotation of the hydraulic pipe 22 is prevented by sandwiching the second pipe part 22c, so that a force for rotating the fastening band part 31 acts, but the hydraulic pipe 22 temporarily fixed to the opposite side. Thereby, rotation of the fastening band part 31 can also be prevented.

  Furthermore, since the length of the hydraulic pipe 22 is not constant due to variations in manufacturing, and the tightening amount at the time of fastening is not constant, the distance from the oil supply port 21e to the second pipe portion 22c varies. Therefore, if the positions of both clamp parts 41, 41 are constant, the second pipe part 22c cannot be clamped when the clamping positions of both the hydraulic pipes 22, 22 are shifted.

  On the other hand, in this hydraulic excavator 1, the fastening band portion 31 is composed of two element members 33, each element member 33 is provided with a clamp portion 41, and the fastening portion 36 has a long hole 38 extending parallel to the cylinder body 21. Is formed. Therefore, since the position of both clamp parts 41 and 41 can be adjusted by shifting the element member 33 in the direction in which the cylinder body 21 extends by the length of the long hole 38, the clamping position of both hydraulic pipes 22 and 22 is shifted. However, the 2nd pipe part 22c can be clamped.

  Moreover, in the support member 30 of this embodiment, the clamp part 41 is biased and located in the one fastening part 36 side. Therefore, when the fastening portions 36 of both element members 33 are fastened, one of the fastening portions 36 faces a wide space and is easily fastened.

  Therefore, with this hydraulic excavator 1, the hydraulic pipe 22 can be easily attached to the hydraulic cylinder 15, and the hydraulic pipe 22 can be stably supported even after the attachment.

  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, in the above-described embodiment, the example in which the second pipe portion 22c extending in the direction intersecting the cylinder main body 21 is sandwiched from the inside and the outside in the radial direction of the cylinder main body 21 has been described.

  As shown in FIG. 9, the second pipe portion 22c may be sandwiched from the direction in which the cylinder body 21 extends. Further, as shown in FIG. 10, the first pipe portion 22 a may be sandwiched from inside and outside in the radial direction of the cylinder body 21. The clamping direction may be different on the left and right.

  The working machine is not limited to the hydraulic excavator, and the type of the hydraulic excavator is not limited to the above-described model. The present invention can be applied not only to the bucket cylinder but also to other hydraulic cylinders installed in the attachment such as an arm cylinder.

  Only a round hole may be formed in the 2nd fastening part, and it may fasten using a nut of another member. Moreover, you may make both a 1st fastening part and a 2nd fastening part into a long hole. By doing so, it is possible to increase the adjustment range of the positional deviation.

1 Excavator (work machine)
2 Lower traveling body 3 Machine body 7 Attachment 11 Bucket 12 Arm (support member)
13 Boom (support member)
DESCRIPTION OF SYMBOLS 15 Hydraulic cylinder 21 Cylinder main body 21e Oil supply port 22 Hydraulic piping 22a 1st pipe part 22b Bending part 22c 2nd pipe part 23 Hydraulic hose 30 Support member 31 Fastening band part 33 Element member 34 Band element 35 Fastening part 36 Fastening part 38 Long hole 41 Clamp part

Claims (3)

A work machine in which a machine body is installed on a lower traveling body,
The machine body includes an attachment for performing work operation by hydraulic control,
The attachment is
A plurality of support members each swingably connected;
A hydraulic cylinder installed in the support member;
Have
The hydraulic cylinder is
A cylindrical cylinder body provided with two oil filler openings;
A pair of hydraulic pipes having one end connected to each of the oil supply ports and the other end connected to a hydraulic hose extending from the machine body side;
A support member attached to the cylinder body and supporting the pair of hydraulic pipes;
Have
The support member is
An annular fastening band portion fastened and attached to the outer periphery of the cylinder body;
A pair of clamp parts for sandwiching each of the pair of hydraulic pipes;
Have
The work machine characterized in that the pair of clamp portions protrude in opposite directions from the fastening band portion toward the outside in the radial direction. The work machine according to claim 1,
The hydraulic piping is
A first pipe portion that is fastened to the fuel filler port by screwing in a direction in which the cylinder body extends, and extends along the cylinder body;
A second pipe part fastened to the hydraulic hose and extending in a direction intersecting the first pipe part;
Have
A work machine in which the second pipe part is supported by the clamp part. The work machine according to claim 2,
The support member is composed of a pair of element members fastened to each other,
Each of the element members is
The clamp part;
A band element constituting the fastening band portion;
Have
The band element is
An arc-shaped fastening part;
Fastening portions provided at both ends of the tightening portion;
Have
A work machine in which a fastening long hole is formed in the fastening portion so as to extend parallel to the cylinder body when attached to the cylinder body.

Images