JP4004041B2 - Hydraulic piping structure of left and right swing type work equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention provides a swing bracket attached to a front end portion of an upper swing body of a swing work vehicle so as to be swingable in the left-right direction. The swing bracket includes a boom, an arm and a work tool (such as a bucket), and the boom, arm, and work. The present invention relates to a hydraulic piping structure of a left-right swing type work machine device to which a work machine device provided with a plurality of hydraulic cylinders for driving tools is attached.
[0002]
[Prior art]
In a swivel working vehicle such as a hydraulic excavator in which the work implement device is mounted on a swing bracket, the hydraulic hose pipes for the boom, arm, and bucket hydraulic cylinders of the work implement device are connected from the inside of the upper swing body to the inside of the swing bracket. In addition to passing into the space, several hydraulic hoses passed into the internal space are combined in parallel and fixed to the swing bracket in an integrated state, and then bent upward on the boom lifting fulcrum attached to the top of the swing bracket. Pipes are connected to the hydraulic cylinders. (For example, refer to Japanese Utility Model Publication No. 7-12445)
[0003]
[Problems to be solved by the invention]
According to the conventional hydraulic piping, the boom cylinder hydraulic hose is led to the upper side of the swing bracket through the inner space of the swing bracket, and is bent so as to bend and displace in the vertical direction at the upper position. It is connected to the boom cylinder through a relay hydraulic hose provided from the fixed pipe to the boom cylinder.
Therefore, not only is the boom cylinder hydraulic hose too long, but the fixed pipe and the relay hydraulic hose are exposed around the boom cylinder before reaching the boom cylinder. There is a problem that the relay hydraulic hose is likely to be damaged.
[0004]
Further, according to the conventional hydraulic piping structure, the displacement of the hydraulic hose that moves as the swing of the swing bracket is absorbed by the change in the radius of curvature of the hose portion that is bent and arranged in a substantially arc shape. This absorption means is such that the radius of curvature changes while the arc end of the hose connected to the swing bracket side moves left and right as the swing bracket swings. Combined with the movement, the hydraulic hose is displaced. Therefore, it is necessary to provide a large hydraulic hose piping space inside the upper swing body for arranging the hydraulic hoses in an arc shape. However, this hydraulic hose piping space is usually greatly restricted due to the installation of equipment and the like, and therefore there is a problem that it is difficult to arrange the hydraulic hose in an arc shape in the piping space.
[0005]
Furthermore, the hose portion having the arcuate bend moves and displaces while rubbing against the upper and lower and left and right wall surfaces, and therefore, there is a problem that wear of the hydraulic hose is accelerated.
[0006]
Furthermore, the hose portion of the hydraulic hose having the arcuate bend is laid so as to be displaceable left and right and up and down, so that the free hose entangles and rubs with each other, and the durability of the hydraulic hose is also improved. There is a problem that hurts.
[0007]
In order to solve the above-mentioned problems, the present invention makes it possible to shorten the overall length of the hydraulic hose for the boom cylinder among the hydraulic hoses that pass from the inside of the upper swing body to the internal space of the swing bracket. The purpose is to provide a hydraulic piping structure for a left-right swing type work implement device that avoids widening and prevents tangling and rubbing of the hoses and contact with the floor of the hose when the hydraulic hose is bent. It is said.
[0008]
[Means for solving the problem, operation, and effect]
In order to achieve the above object, the first invention attaches a swing bracket to the front end portion of the upper turning body of the turning work vehicle so as to be swingable about the vertical axis, and a boom, an arm and a work implement on the swing bracket, A work machine device having a boom, an arm, and a hydraulic cylinder for driving each of the work tools is attached, and each hydraulic hose is connected to each of the hydraulic hoses via the swing bracket from a plurality of control switching valves provided inside the upper swing body. In the hydraulic piping structure of the left-right swing type work machine device connected to the hydraulic cylinder, the swing bracket includes an upper and lower branch wall composed of a horizontally projecting wall connected to a front end portion of the upper swing body, and a front end of the branch wall A main body having a vertical wall that joins the upper and lower parts, and from the inner space of the swing bracket between the upper and lower branch walls, To part space Lay out and move from bottom to top along the boom cylinder A first communication hole for laying a hydraulic hose for a boom cylinder is opened in the vertical wall. Insert the rubber cushion and hold the boom cylinder hydraulic hose. A first piping arrangement passage is formed, and a second communication hole is provided in the upper branch wall for laying hydraulic hoses for arm cylinders and work implement cylinders in the external space of the boom mounting portion of the swing bracket. Thus, the second piping arrangement passage is formed.
[0009]
According to the first invention, a hydraulic hose for a boom cylinder The , Swing bracket Front vertical wall Provided in Clamp with a rubber cushion fitted in the communication hole via the communication hole. Near the connecting pin of the boom cylinder mounting part from the dedicated installation path From the bottom along the boom cylinder via Since it is installed directly, the piping length of the boom cylinder hydraulic hose can be shortened and installed compactly. Accordingly, it can be installed separately from the cylinder hydraulic hoses other than the boom cylinder hydraulic hoses, and only the boom cylinder hydraulic hoses are not bent and damaged as the swing bracket swings as in the prior art.
[0010]
According to a second invention, in the first invention, a boom cylinder hydraulic hose laid from the inside of the upper swinging body via the internal space of the swing bracket and the first piping arrangement passage, the boom cylinder and the swing bracket A hydraulic hose for the arm cylinder, work tool cylinder, etc., fixed by a first fixing clamp in the vicinity of the pin to be connected and laid through the internal space of the swing bracket and the second piping arrangement passage, And a swing bracket is fixed in the vicinity of the shaft connecting the swing bracket and connected to the respective hydraulic cylinders.
[0011]
According to the second aspect of the invention, only the boom cylinder hydraulic hose is laid directly in the vicinity of the connecting pin of the boom cylinder mounting portion from the first dedicated passage provided in the swing bracket, and is fixed by the first fixing clamp. At the same time, a cylinder hydraulic hose other than the boom cylinder hydraulic hose is installed directly in the vicinity of the connecting pin of the boom mounting portion from the second dedicated passage provided in the swing bracket, and is fixed by the second fixing clamp. Therefore, the piping lengths of the boom cylinder hydraulic hose and other cylinder hydraulic hoses are shortened to reduce the amount of bending of the piping between the swing bracket and the boom cylinder and between the swing bracket and the other cylinder. be able to. Thereby, when the boom and the boom cylinder are swung, the respective hydraulic hoses are not bent and damaged, and the durability can be improved.
[0012]
The third invention is First or In the second invention, a pipe fixing clamp member that binds and fixes the hydraulic hoses from the plurality of control switching valves in the piping space inside the upper swing body, and the hydraulic hoses fixed by the pipe fixing clamp members. The hose has a piping guide member that restricts movement in the lateral direction of the hose and guides movement in the longitudinal direction of the hose to pass into the internal space of the swing bracket.
[0013]
According to the third invention, the curved laying section of the front hydraulic hose that passes from the plurality of control switching valves inside the upper swing body to the internal space of the swing bracket is held by the pipe fixing clamp member and the pipe guide member. The bending back due to the reaction force of the curved hose portion can be suppressed. In addition, when the hydraulic hose is moved by being pulled or pushed along with the swing of the swing bracket, the movement of the hose in the lateral direction is restricted by the piping guide member, and the movement in the longitudinal direction of the hose is guided. The bending amount of the curved hose portion changes smoothly so that the hydraulic hoses are not entangled or engaged with each other, and the hose can be prevented from being damaged.
[0014]
In a fourth aspect based on the third aspect, the pipe fixing clamp member is installed on an aerial mount provided at an aerial position in the pipe space inside the upper swing body, and a hose between the pipe guide member and the pipe It is set as the structure fixed to the state separated from the upper surface and lower surface of space.
[0015]
According to the fourth invention, even if the hydraulic hose moves due to the displacement of the curved hose part, the hydraulic hose touches the upper and lower wall surfaces in the piping space because it is separated from the upper surface and the lower surface of the piping space inside the upper swing body. There is no. For this reason, the hydraulic hose is not damaged by friction, and durability can be improved.
[0016]
A fifth invention is the binding according to the fourth invention, wherein the pipe guide member has two upper and lower insertion portions through which the hydraulic hoses are inserted in one horizontal row, and the pipe fixing clamp member clamps the hydraulic hoses in the two vertical rows. It has a clamp part, and is constructed such that the hose between the pipe guide member and the pipe fixing clamp member does not overlap.
[0017]
According to the fifth invention, the pipe fixing clamp member has two vertical rows of binding clamp portions, and the pipe guide member has two upper and lower insertion portions for inserting the hydraulic hoses in one horizontal row, respectively. The curved hose portions are spaced apart at predetermined intervals in the vertical direction by the two vertical rows of binding clamp portions and cross over the pipe guide members in the horizontal direction, so that the curved hose portions do not overlap each other. For this reason, when the hydraulic hoses move with the swing of the swing bracket, they do not rub against each other, so that the movement of the hydraulic hoses is smooth and hardly entangled, and the durability of each hydraulic hose can be improved.
[0018]
The sixth invention is the fifth invention, wherein only the boom cylinder hydraulic hose of the hydraulic hoses is clamped to the lowest row in the two vertical rows of the binding clamp portions of the pipe fixing clamp member, and the pipe guide The member is inserted into the lower insertion portion of the member, and is configured to be distinguished from hydraulic hoses for arm cylinders and work tool cylinders.
[0019]
According to the sixth invention, by using the swing bracket as in the first invention, a fixed clamp for fixing the boom cylinder hydraulic hose at a position different from the center of the swing in the radial direction, and a boom cylinder other than the boom cylinder hydraulic hose. Since the fixed clamps for fixing the hydraulic hoses for the arm cylinders and the working tool cylinders such as the bucket and the attached working tools are respectively positioned, there is a difference in the movement strokes of both hydraulic hoses accompanying the swing of the swing bracket. By laying only the boom cylinder hydraulic hose, it is possible to avoid damage due to friction.
[0020]
A seventh invention is the invention according to any one of the third to sixth inventions, wherein the pipe fixing clamp member is attached to be rotatable about a substantially vertical axis according to a deflection displacement of the hydraulic hose. It is configured.
[0021]
According to the seventh invention, the piping fixing clamp member is rotated by the reaction force of the bending and pushing applied to the curved hose portion as the swing bracket swings. The displacement is reduced, and the entanglement between the hoses can be eliminated. Further, since an excessive external force is not applied to the curved hydraulic hose portion, the durability of the hydraulic hose can be improved.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below in detail with reference to the drawings.
[0023]
First, a configuration of a swing type hydraulic excavator will be described with reference to FIG. 1 as an example of a turning work vehicle equipped with a left and right swing type work implement device to which the present invention is applied. FIG. 1 is a side view showing a turning work vehicle equipped with a left and right swing type work implement device according to the present invention.
The turning work vehicle has an upper turning body 12 equipped with a work implement device 11 mounted on the crawler type traveling device 10 so as to be turnable. In addition to the work machine device 11, the upper swing body 12 includes a cab 13 in which various operation means for performing the running operation of the turning work vehicle and the work operation of the work machine device 11 are installed, and the power of the running and work. A source engine 14, a hydraulic device (not shown) that supplies hydraulic power generated by the engine 14 to the crawler type traveling device 10 and the work implement device 11, and a counterweight 15 for stabilizing the vehicle body It is installed.
[0024]
The work machine device 11 is attached to a swing bracket 16 provided at the front end of the upper swing body 12 so as to be swingable around a vertical axis. The work machine device 11 includes a boom 17 whose base is pin-coupled to the swing bracket 16, an arm 18 whose base is pin-coupled to the distal end of the boom 17, and a bucket whose base is pin-coupled to the distal end of the arm 18. 19 and a hydraulic cylinder between the swing bracket 16 and the boom 17 so that the boom 17 is vertically raised and lowered, the arm 16 is vertically raised and lowered, and the bucket 19 is lifted and lowered. A boom cylinder 20 having a hydraulic cylinder between the boom 17 and the arm 18 and a bucket cylinder 22 having a hydraulic cylinder between the arm 18 and the bucket 19. Yes.
[0025]
And, to the boom cylinder 20, arm cylinder 21 and bucket cylinder 22, a hydraulic hose connected to a control switching valve (see FIG. 6 described later) for each cylinder installed inside the upper swing body 12 is connected to the swing. Each connection is made via the internal space of the bracket 16.
[0026]
Next, with regard to the improved hydraulic hose piping structure in the left and right swing type work machine device of the turning work vehicle, first, the piping arrangement structure of the swing bracket will be described with reference to FIGS. FIG. 2 is a side view of the swing bracket according to the present invention, and FIG. 3 is an X view of FIG.
The swing bracket 16 includes a main body 25 having a U-shaped main body 25 having walls 26, 27, and 29 that are branched in three upper and lower stages and project in the horizontal direction. Of these, the upper branch wall 26 and the middle branch wall 27 are paired to form a female coupling portion 28, and the lower branch wall 29 constitutes a male coupling portion 30. Further, a boom cylinder mounting portion 32 for attaching the boom cylinder 20 to the front surface portion of the vertical wall 31 of the main body portion 25 and a boom mounting portion 33 for attaching the boom 17 to the upper surface portion of the upper branch wall 26 are integrally formed. ing. Between the upper branch wall 26 and the middle branch wall 27 of the female connection portion 28, a male cradle 35 that protrudes in the horizontal direction at the front end of the upper swing body 12 is fitted, and the male connection portion 30. A pair of upper and lower female receiving members 36a projecting in the horizontal direction at a predetermined interval in the vertical direction of the female receiving base 36 provided at the front end portion of the upper swing body 12 below the male receiving base 35. 36b, with the female connecting portion 28 and the male receiving base 35, and the male connecting portion 30 and the female receiving stand 36 being paired respectively by vertical axes 34 and 37, respectively. It is connected. A space between the vertical axes 34 and 37 is an internal space 38 for passing a hydraulic cylinder hose through the swing bracket 16.
[0027]
The vertical wall 31 between the middle branch wall 27 and the lower branch wall 29 is provided with a communication hole 41 that communicates the internal space 38 with the external space near the connection pin 39 of the boom cylinder mounting portion 32. The first piping arrangement passage 42 is formed, and the boom cylinder hydraulic hose 40 (going to and from the inner space 38 to the outer space near the connecting pin 39 of the boom cylinder mounting portion 32 via the communication hole 41. Two return hoses are indicated by a single reference number). The middle branch wall 27 and the upper branch wall 26 are provided with communication holes 46 and 47 for communicating the internal space 38 with the external space in the vicinity of the boom mounting shaft 17a of the boom mounting portion 33, respectively. A piping arrangement passage 48 is formed, and an arm, a bucket, and an attached work tool (see FIG. 5) are passed from the internal space 38 to the external space in the vicinity of the boom mounting shaft 17a of the boom mounting portion 33 via the communication holes 46 and 47. (Not shown) hydraulic hoses 43, 44, 45 for each cylinder (two hoses are indicated by a single reference number).
[0028]
Further, a first fixed clamp portion 49 for fastening the boom cylinder hydraulic hose 40 to a position in the vicinity of the connecting pin 39 of the boom cylinder mounting portion 32, and a position in the vicinity of the boom mounting shaft 17a of the boom mounting portion 33. In addition, it has a second fixed clamp portion 50 that collectively locks the hydraulic hoses 43, 44, 45 for the cylinders of the arm, bucket, and attached work tool.
[0029]
4 is a cross-sectional view taken along the line AA of FIG. 3, showing a cross-sectional view of the first fixed clamp portion, and FIG. 5 is a cross-sectional view of the second fixed clamp portion.
As shown in FIG. 4, the first fixed clamp portion 49 that fixes the boom cylinder hydraulic hose 40 includes a clamp member 52 to which a rubber cushion 51 that clamps the hydraulic hose is attached. The rubber cushion 51 is fitted into the communication hole 41 on the front surface of the swing bracket 16, and the clamp member 52 is fixed to the front surface of the communication hole 41 with a bolt 55.
Further, as shown in FIG. 5, a fixed clamp portion 50 for fixing the hydraulic hoses 43, 44, 45 for the cylinders of the arms, buckets, and attached work tools is provided in a rubber cushion 53 for sandwiching the hydraulic hoses. One pair of hydraulic hoses 43, 44, 45 for each cylinder other than the boom such as an arm, a bucket, and an attached work tool are inserted side by side, and the rubber cushion 53 is formed in a pair of fixed portions formed on the upper surface of the upper branch wall 25. The clamp plate 54 is clamped from above the rubber cushion 53 and attached to the pair of fixing portions 57 and 57 with bolts 56 and 56.
[0030]
As shown in FIG. 2, the piping in the swing bracket 16 configured as described above is such that each cylinder hydraulic hose is passed from the upper swing body interior 60 to the internal space 38 of the swing bracket 16, and the boom cylinder therein Only the hydraulic hose 40 is connected to the boom cylinder 20 through the vicinity of the connecting pin 39 of the boom cylinder mounting portion 32 via the first piping arrangement passage 42 formed in the swing bracket 16, and an arm other than the boom cylinder 20. The hydraulic hoses 43, 44, 45 for the cylinders such as buckets and attached work tools pass through the second piping arrangement passage 48 formed in the swing bracket 16 and pass through the vicinity of the boom mounting shaft 17 a of the boom mounting portion 33. The arm 18, the bucket 19, and the attached work tools are connected to the cylinders 21 and 22, respectively.
[0031]
In the above-described anchoring of the hydraulic hose to the work implement swing bracket 16, the hydraulic hose is bent or laid in advance because the hydraulic hose is pulled or pushed by the left and right swing of the work implement swing bracket 16. In addition, the external force of the pulling or pushing movement is absorbed by the displacement of the bending portion. The bending position of the hydraulic hose is provided in the piping space inside the upper swing body.
Next, a piping arrangement configuration obtained by improving the bending portion arrangement will be described with reference to FIGS. FIG. 6 is a side view showing the hydraulic piping structure of the work machine device, and FIG. 7 is a plan view of FIG.
[0032]
The upper swing body 12 is directed toward the internal space 38 of the swing bracket 16 between the male receiver 35 and the female receiver 36 provided at the front end of the swing body to support the work implement swing bracket 16 described above. An open hydraulic hose outlet 61 is provided, and a piping space 62 is provided behind the hydraulic hose outlet 61 for bending the hydraulic hose inside the upper swing body. In the piping space 62 inside the upper swing body, a boom cylinder control switching valve 63, an arm cylinder control switching valve 64, a bucket cylinder control switching valve 65, and an attached work tool cylinder installed in the interior 60 of the upper swing body 12 are provided. A pipe fixing clamp member 67 for binding and fixing two hydraulic hoses 40, 43, 44, 45 connected to the control switching valve 66, and the swing bracket 16 positioned at the hydraulic hose outlet 61. And a pipe guide member 68 for passing the hydraulic hoses 40, 43, 44, 45 to the internal space 38. Then, the hydraulic hoses 40, 43, 44, 45 are curved and installed between the pipe fixing clamp member 67 and the pipe guide member 68, and are delivered to the internal space 38 of the swing bracket 16. I am trying.
[0033]
FIG. 8 is a front view showing a pipe guide member, and FIG. 9 is a front view showing a pipe fixing clamp member.
As shown in FIG. 8, the pipe guide member 68 has two upper and lower insertion portions 70 and 71 for inserting a hydraulic hose in one horizontal row. In this embodiment, the pipe guide member 68 has two horizontal upper and lower pipe members. The insertion parts 70 and 71 are partitioned. Further, as shown in FIG. 9, the pipe fixing clamp member 67 fixes the outer peripheral portion of a rubber cushion 72 having a plurality of hydraulic hose insertion holes in two vertical rows by a binding clamp portion 73.
The curved hose is laid out by clamping one side of the curved end of the curved hose portion with a predetermined interval in the vertical direction by the two vertical pipe fixing clamp members 67 and the other curved end of the curved hose portion. The side is passed through the two horizontal rows of insertion portions 70 and 71 by the pipe guide member 68. Thereby, each curved hose part is arrange | positioned in piping space in the suspended state, without overlapping.
[0034]
The pipe fixing clamp member 67 and the pipe guide member 68 are positioned at both ends of the respective hydraulic hose bending portions and maintain the hose bending state, so that the bending back is suppressed, and the added bending posture enters the piping space 62. It makes it possible to keep the curved hose part. When each hydraulic hose is pulled or pushed along with the swing of the swing bracket 16, the pipe guide member 68 suppresses a curvature radius change of the curvature due to a radial displacement (lateral deviation) of each hydraulic hose, As each hydraulic hose moves in the axial direction, the amount of bending of the curved hose portion is guided to increase or decrease. Thereby, the displacement of the hydraulic hose due to the swing of the swing bracket 16 is absorbed.
[0035]
Further, the pipe fixing clamp member 67 is installed on an aerial mount 69 provided at an aerial position in the pipe space 62 inside the upper swing body, and the curved hose portion between the pipe guide member 68 is suspended. The arrangement is as follows. And even if the hydraulic hose moves due to the displacement of the curved hose portion, the hydraulic hose does not touch the upper and lower wall surfaces of the piping space inside the upper swing body.
[0036]
Of the hydraulic hoses, only the boom cylinder hydraulic hose 40 is clamped to the lowest row of the vertical two-row clamp portion of the pipe fixing clamp member 67, and is inserted into the lower insertion portion 71 of the pipe guide member 68. It is laid and distinguished from the hydraulic hoses for cylinders of arms, buckets, and attached work tools. As a result, the boom cylinder hydraulic hose 40 passes through a different laying path from the other cylinder hydraulic hoses 43, 44, 45 other than the boom cylinder. Therefore, even if the displacement during the swing is larger than the other cylinders No tangling with the hydraulic hose.
[0037]
Further, with the above-described configuration, the fixed clamp for fixing the hydraulic hoses for the cylinders of the arms, buckets, and attached work tools, and the fixed clamp for fixing the hydraulic hoses for the boom cylinders are arranged in the radial direction from the swing center. Accordingly, there is a difference in the movement stroke of the hydraulic hose accompanying the swing of the swing bracket, and only the boom cylinder hydraulic hose 40 is used for the cylinder, hydraulic hoses 43 and 44 for the arms, buckets, and attached work tools. , 45 will be different. Even if this different movement occurs, the boom cylinder hydraulic hose 40 is passed through the lower insertion portion 71 of the pipe guide member 68 and positioned at the lowest position in the pipe space 62 by the pipe fixing clamp member 67. Since the cylinder hydraulic hoses 43, 44, and 45 are installed separately from each other, the boom cylinder hydraulic hoses 40 are rubbed with the cylinder hydraulic hoses 43, 44, and 45 of the arms, buckets, and attached work tools. Disappear.
[0038]
Further, as shown in FIG. 9, the pipe fixing clamp member 67 is placed on an aerial mount 69 so as to be swingable about a rotating shaft 75 having a substantially vertical axis provided in the lower part thereof. . Thereby, as the swing bracket swings, the piping fixing clamp member 67 swings left and right in response to the reaction force of the bending and pushing applied to the curved hose part. The curved state is almost maintained and the entire hose is easily swung, and the hose is not entangled.
[0039]
As described above, the control switching valves 63, 64, 65, and 66 are stacked in the order of the boom, arm, bucket, and auxiliary work machine from the lower stage to the upper stage in the upper swing body, and this stacking order is set. The two hydraulic hoses 40, 43, 44, and 45 that are output from the control switching valves 63, 64, 65, and 66 are connected to the clamp portion by the vertical two-row binding clamp portion 73 of the pipe fixing clamp member 67. From the lower stage to the upper stage, the boom, arm, bucket, and hydraulic hose for each cylinder of the attached work machine are clamped in order and spatially positioned in the pipe space 62. Furthermore, the hydraulic hoses 43, 44, 45 for the cylinders of the arm, the bucket, and the attached work machine are bent in a curved shape, and the upper two insertion portions 70 of the pipe guide member 68 are arranged in the order of positioning of the vertical two-row binding clamp portion 73. The boom cylinder hydraulic hose 40 is bent in a curved shape and is inserted side by side into the lower insertion portion 71 of the piping guide member 68 and passed into the internal space 38 of the swing bracket 16.
[0040]
The hydraulic hoses 43, 44, 45 for the cylinders of the arm, bucket, and work tool are fixedly positioned near the boom mounting shaft 17 a of the boom mounting portion 33 through the second piping arrangement passage 46 in the swing bracket 16. In addition, the boom cylinder hydraulic hose 40 is connected to the arm cylinder 21, the bucket cylinder 22, and other work tool cylinders (not shown), respectively, through the first piping arrangement passage 42 in the swing bracket 16. The boom cylinder 20 is connected to the boom cylinder 20 after being fixedly positioned near the connecting pin 32 of the boom cylinder mounting portion 32.
[0041]
Since the present invention is configured as described above, the following effects can be obtained.
[0042]
The boom cylinder hydraulic hose in the swing bracket is routed separately from the hydraulic hoses for the other cylinders, via the disposition path provided in the swing bracket, and in the vicinity of the connecting pin of the boom cylinder. Since it is arranged directly on the boom cylinder, there is an effect that the hose length is shortened as compared with the conventional case. In addition, since the boom cylinder hydraulic hose is fixed to the position near the connecting pin of the boom cylinder by the fixing clamp, the amount of bending of the boom cylinder hydraulic hose that bends as the boom cylinder swings up and down can be reduced. Damage due to contact with external obstacles can be prevented.
[0043]
The curved arrangement of the hydraulic hose on the swing bracket is held by the pipe fixing clamp members and the pipe guide members provided at both ends of the hose curved portion, so that the return of the curve can be suppressed and added. It becomes possible to keep the curved hose portion in the piping space with the curved posture.
Further, when the hydraulic hoses are pulled or pushed as the swing bracket swings, the piping guide member guides the hydraulic hoses to move substantially in the direction of the hose axis, and the curved hose portion. The amount of bending of the hydraulic hose can be increased and decreased, and the displacement of the hydraulic hose due to the swing of the swing bracket can be absorbed. For this reason, the piping space inside the upper swing body may be a space in which the bending amount increase / decrease range of the curved hose portion is accommodated, and the piping space can be narrowed as compared with the conventional case.
[0044]
In addition, since the piping fixing clamp member is installed in the aerial position in the piping space inside the upper swing body and the curved hose part is arranged in a suspended state, even if the hydraulic hose moves due to the displacement of the curved hose part, Since the hydraulic hoses do not touch the upper and lower wall surfaces of the piping space inside the upper swing body, hose damage due to rubbing with the upper and lower wall surfaces can be prevented.
[0045]
In addition, since the curved hose part suspended in the air is crossed over the two vertical rows of binding clamp portions and the horizontal line of piping guide members so that the curved hose parts do not overlap each other, the hose is displaced in a curved state. Resistance can be eliminated and entanglement can be prevented.
[0046]
In addition, because the hydraulic hoses for the cylinders and boom cylinders for arms, buckets, and attached work tools are divided into upper and lower parts, even if there is a difference in the amount of movement of the hoses due to the swing of the swing bracket, There is no contact, and damage due to rubbing can be avoided.
[0047]
In addition, when a bending displacement force is applied to the hydraulic hose bending part, the pipe fixing clamp member swings left and right around the vertical axis due to the hose reaction force. It is easy to move and can prevent entanglement between hydraulic hoses.
[0048]
Further, the hydraulic hoses reaching the hydraulic cylinders from the control switching valves can be arranged in an aligned manner by the pipe fixing clamp member and the pipe guide member without crossing in the middle.
[Brief description of the drawings]
FIG. 1 is a side view of a turning work vehicle to which the present invention is applied.
FIG. 2 is a side view of a swing bracket according to the present invention.
3 is an X view of FIG. 2. FIG.
4 is a cross-sectional view taken along the line AA in FIG. 3;
FIG. 5 is a cross-sectional view of an arm, a bucket, and an attached work tool cylinder hydraulic hose fixing clamp portion configured in a swing bracket.
FIG. 6 is a side view showing a hydraulic piping structure of the work machine device.
FIG. 7 is a top view of the same.
FIG. 8 is a front view showing a pipe guide member.
FIG. 9 is a front view showing a pipe fixing clamp member.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Crawler type traveling apparatus, 11 ... Work implement apparatus, 12 ... Upper turning body, 13 ... Driver's cab, 14 ... Engine, 15 ... Counterweight, 16 ... Swing bracket, 17 ... Boom, 17a ... Boom attachment shaft, 18 ... Arm, 19 ... Bucket, 20 ... Boom cylinder, 21 ... Arm cylinder, 22 ... Bucket cylinder, 25 ... Main part, 26 ... Upper branch wall, 27 ... Middle branch wall, 28 ... Female connecting part, 29 ... Lower branch wall , 30 ... male connecting part, 31 ... vertical wall, 32 ... boom cylinder attaching part, 33 ... boom attaching part, 34 ... vertical axis, 35 ... male receiving part, 36 ... female receiving part, 37 ... vertical axis, 38 ... Internal space, 39 ... Connecting pin, 40 ... Boom cylinder hydraulic hose, 41 ... Communication hole, 42 ... Piping passage, 43.44.45 ... Arm, bucket, hydraulic hose for attached work tool cylinder, 46. 7 ... Communication hole, 48 ... Piping arrangement passage, 49 ... Fixed clamp part, 50 ... Fixed clamp part, 51 ... Rubber cushion, 52 ... Clamp member, 53 ... Rubber cushion, 54 ... Clamp plate, 60 ... Inside upper revolving unit 61 ... Hydraulic hose outlet, 62 ... Piping space, 63 ... Boom cylinder control switching valve, 64 ... Arm boom cylinder control switching valve, 65 ... Bucket cylinder control switching valve, 66 ... Attached work tool cylinder control switching Valve: 67 ... Pipe fixing clamp member, 68 ... Pipe guide member, 69 ... Aerial mount, 70 ... Upper insertion portion, 71 ... Lower insertion portion, 72 ... Rubber cushion, 73 ... Bundling clamp portion, 75 ... Rotating shaft.

Claims (7)

A swing bracket (16) is attached to the front end of the upper swing body (12) of the swing work vehicle so as to be swingable about the vertical axis, and the boom (17), the arm (18) and the work tool are attached to the swing bracket (16). And a work implement device (11) having a hydraulic cylinder (20, 21, 22) for driving the boom (17), the arm (18), and the work tool (19), respectively, Left and right connecting the respective hydraulic hoses to the respective hydraulic cylinders (20, 21, 22) from the plurality of control switching valves (63, 64, 65, 66) provided inside through the swing bracket (16). In the hydraulic piping structure of the swing type work machine device,
The swing bracket (16) includes an upper and lower branch wall (26, 27, 29) and a branch wall (26, 27, 29) composed of a horizontally projecting wall connected to the front end of the upper swing body (12). An inner space (38) of the swing bracket (16) between the upper and lower branch walls (26, 27, 29). from), the boom cylinder attachment portion (32) and laying the external space, the lower part along a boom cylinder (20) the boom cylinder to the upper (20) hydraulic hose (40) first for laying for A communication hole (41) is opened in the vertical wall (31) and a rubber cushion (51) is fitted to form a first piping arrangement passage (42) for sandwiching the boom cylinder hydraulic hose (40). Second communication holes (46, 46) for laying hydraulic hoses (43, 44) for the arm cylinder (21), the work tool cylinder (22), etc. in the external space of the boom mounting part (33) of the bracket (16) 47) above Of the branch wall (26, 27)
A hydraulic piping structure for a left-right swing type working machine device, characterized in that a second piping arrangement passage (48) is formed by opening it to the left. 2. The hydraulic piping structure for a left-right swing type work machine device according to claim 1, wherein the upper swing body is passed through an internal space (38) of the swing bracket (16) and the first piping arrangement passage (42). The laid boom cylinder hydraulic hose (40) is fixed by a first fixing clamp (49) in the vicinity of the pin (39) connecting the boom cylinder (20) and the swing bracket (16), and the swing bracket (16 ) Hydraulic hoses (43, 44) for the arm cylinder (21), the work tool cylinder (22) and the like installed via the internal space (38) and the second piping arrangement passage (48), That the boom (17) and the swing bracket (16) are connected by the second fixing clamp (50) in the vicinity of the shaft (17a) and connected to the respective hydraulic cylinders (20, 21, 22). The hydraulic piping structure of the left / right swing type work machine. Pipe fixing clamp member (67) for binding and fixing the hydraulic hoses (40, 43, 44) from the plurality of control switching valves (63, 64, 65) to the pipe space (62) inside the upper swing body Each of the hydraulic hoses (40, 43, 44) fixed by the pipe fixing clamp member (67), restricting the movement in the lateral direction of the hose and guiding the movement in the longitudinal direction of the hose, 3. The hydraulic piping structure for a left-right swing type work machine according to claim 1, further comprising a piping guide member (68) for passing into the internal space (38) of the bracket (16). The pipe fixing clamp member (67) is installed on an aerial mount (69) provided at an aerial position in the pipe space (62) inside the upper swing body, and a hose between the pipe guide member (68) is provided. 4. The hydraulic piping structure for a left-right swing type work machine device according to claim 3, wherein the piping space is fixed in a state separated from an upper surface and a lower surface of the piping space. The pipe guide member (68) has two upper and lower insertion portions (70, 71) for inserting the hydraulic hoses in one horizontal row, and the pipe fixing clamp member (67) clamps the hydraulic hoses in two vertical rows. 5. The left and right sides according to claim 4, further comprising a bundling clamp portion (73), wherein the hose between the pipe guide member (68) and the pipe fixing clamp member (67) is laid so as not to overlap. Hydraulic piping structure for swing type work equipment. Of the hydraulic hoses (40, 43, 44), only the boom cylinder hydraulic hose (40) is placed in the lowest row of the two vertical rows of the binding clamp portion (73) of the pipe fixing clamp member (67). Clamped and inserted through the lower insertion portion (71) of the pipe guide member (68), and laid out separately from the hydraulic hoses (43, 44) for the arm cylinder (21) and the work tool cylinder (22), etc. 6. The hydraulic piping structure for a left-right swing type work machine according to claim 5, wherein: The pipe fixing clamp member (67) is attached so as to be rotatable about a substantially vertical axis (75) according to a deflection displacement of the hydraulic hose (40, 43, 44). The hydraulic piping structure of the left-right swing type work machine device according to any one of 3 to 6.

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