Valve device mounting structure

Abstract

To protect a flow path that connects a fluid cylinder and a valve device from obstacles.SOLUTION: A mounting structure of a valve device 60 includes: an offset cylinder 56 that has a first port 561; a valve device 60 that has a second port 602; and a first flow path 61 that connects the first port 561 and the second port 602. The first port 561 and the second port 602 face each other when viewed from an axial direction of the offset cylinder 56. The first port 561 and the second port 602 face each other when viewed from a direction intersecting the axial direction.SELECTED DRAWING: Figure 7

Description

Technical Field

[0001] The present invention relates to a mounting structure for a valve device. Background Art

[0002] In a construction machine, if a hose that supplies hydraulic oil to a hydraulic cylinder ruptures or falls off, the hydraulic oil will flow out from the hose, no load will be applied to the hydraulic cylinder, and the posture of the working implement may change in an unexpected direction. Accordingly, configurations have been conventionally studied that can maintain the load even when the hose ruptures or falls off. For example, Patent Document 1 describes that a load holding mechanism (valve device) functioning as a check valve that blocks the flow of hydraulic oil is provided in a hydraulic cylinder. Prior Art Documents Patent Documents

[0003] Patent Document 1 Japanese Unexamined Patent Application Publication No. 2016-94769 Summary of the Invention Problem to be Solved by the Invention

[0004] However, in the configuration described in Patent Document 1, the hydraulic oil flow path between the valve device and the hydraulic cylinder is exposed, so there is a problem that the flow path is likely to come into contact with obstacles.

[0005] In view of the above circumstances, an object of the present invention is to provide a mounting structure for a valve device that can protect the flow path between a fluid cylinder and the valve device from obstacles. Means for Solving the Problem

[0006] To solve the above problems, the valve device mounting structure according to the present invention comprises a fluid cylinder having a first port, a valve device having a second port, and a first flow path connecting the first port and the second port, wherein the first port and the second port face each other when viewed from the axial direction of the fluid cylinder.

[0007] The first port and the second port may be facing each other when viewed from a direction intersecting the axial direction.

[0008] When viewed from the fluid cylinder side, the width of the valve device in a direction intersecting the axial direction may be less than or equal to the width of the fluid cylinder.

[0009] The mounting structure of the valve device may include a work machine driven by the fluid cylinder, and the valve device may be positioned in a second direction that intersects the first direction in which the work machine is positioned with respect to the fluid cylinder and the axial direction.

[0010] The mounting structure for the valve device may include a work machine driven by the fluid cylinder, and the valve device may be positioned between the fluid cylinder and the work machine.

[0011] The work machine comprises a first boom, a second boom pivotably connected to the first boom in the left-right direction, a third boom pivotably connected to the second boom in the left-right direction, a fluid cylinder connected to the second boom and the third boom, and an offset rod positioned above or below the fluid cylinder and parallel to the second boom, and connected to the first boom and the third boom. The valve device may be positioned between the fluid cylinder and the offset rod.

[0012] The upper part of the valve device may protrude above the second boom.

[0013] The mounting structure of the valve device includes a third port provided in the fluid cylinder, a fourth port provided in the valve device, and a second flow path connecting the third port and the fourth port, wherein the third port and the fourth port may face each other when viewed from the axial direction.

[0014] The axial positions of the third port and the fourth port may be different from each other.

[0015] The outer diameter of the first flow path and the outer diameter of the second flow path may be different from each other.

[0016] The outer diameter of the first flow path may be larger than the outer diameter of the second flow path.

[0017] The valve device may be disposed at one end of the fluid cylinder. Effects of the Invention

[0018] According to the present invention, the flow path between the fluid cylinder and the valve device can be protected from obstacles. Brief Description of the Drawings

[0019] [Figure 1] FIG. 1 is a left side view of a construction machine according to an embodiment of the present invention. [Figure 2] FIG. 2 is a front view of the construction machine according to an embodiment of the present invention. [Figure 3] FIG. 3 is a left side view of a working machine according to an embodiment of the present invention. [Figure 4] FIG. 4 is a plan view of the working machine according to an embodiment of the present invention. [Figure 5] FIG. 5 is a plan view illustrating an offset operation of the working machine according to an embodiment of the present invention. [Figure 6] FIG. 6 is a plan view illustrating an offset operation of the working machine according to an embodiment of the present invention. [Figure 7] FIG. 7 is a left side view showing a main part of a boom according to an embodiment of the present invention. [Figure 8]It is a front view showing an offset cylinder according to an embodiment of the present invention. [Figure 9] It is a rear view showing an offset cylinder according to an embodiment of the present invention. [Figure 10] It is a bottom view showing a main part of a boom according to an embodiment of the present invention. [Figure 11] It is a plan view showing a main part of a boom according to an embodiment of the present invention. MODE FOR CARRYING OUT THE INVENTION

[0020] Hereinafter, a mounting structure of a valve device 60 according to an embodiment of the present invention will be described with reference to the drawings.

[0021] First, the overall configuration of the construction machine 1 will be described. FIG. 1 is a left side view of the construction machine 1. FIG. 2 is a front view of the construction machine 1. In each figure, U, Lo, L, R, Fr, Rr indicate up, down, left, right, front, and rear, respectively.

[0022] The construction machine 1 is used at construction sites, demolition sites, mines, and the like, and performs work in accordance with operations performed by an operator. The construction machine 1 in the present embodiment is a hydraulic excavator that performs excavation work of earth and sand and the like. The construction machine 1 includes a lower traveling body 2, an upper rotating body 3, and a work implement 4. The upper rotating body 3 is provided above the lower traveling body 2, and the work implement 4 is provided at a right front portion of the upper rotating body 3.

[0023] [Lower Traveling Body] The lower traveling body 2 includes a pair of left and right crawlers 21, a track frame 22, and a blade 24. Power is transmitted to the pair of crawlers 21 from a prime mover 31 provided in the upper rotating body 3, and the crawlers 21 cause the construction machine 1 to travel and the like. The track frame 22 is provided between the pair of crawlers 21, and rotatably supports the upper rotating body 3. The blade 24 is used for land grading work and the like.

[0024] [Upper Traveling Body] The upper slewing body 3 comprises a slewing frame 30, a prime mover 31, a counterweight 32, and an operating unit 33. The slewing frame 30 is rotatably supported on the track frame 22 via a swivel joint (not shown) and is driven to rotate by a hydraulic motor (not shown). The prime mover 31 is, for example, an internal combustion engine. The operating unit 33 is located to the left of the center of the slewing frame 30 in the left-right direction.

[0025] The driver's unit 33 is protected by an enclosure 33C. The enclosure 33C illustrated in Figures 1 and 2 is a canopy type having pillars, a roof, and a bulkhead provided on the side of the work machine 4, but the enclosure 33C may also be a box-shaped cabin type. Inside the driver's unit 33 are a driver's seat 33S where the operator sits, a display unit 33M for displaying various information, an operation unit 33H for receiving operator input, etc. The display unit 33M is, for example, a liquid crystal display device. The operation unit 33H is, for example, an operation lever or a touch panel laminated on the display surface of the display unit 33M. The prime mover 31 is located below the driver's seat 33S. The counterweight 32 is located behind the prime mover 31.

[0026] [Work equipment] Figure 3 is a left side view of the work machine 4. Figure 4 is a top view of the work machine 4. The work machine 4 performs various operations such as excavation, crushing, and soil removal depending on the operation performed by the operator. The work machine 4 is located to the right of the control unit 33. The work machine 4 comprises a boom 41, an arm 42, an attachment 43, and a hydraulic system. The boom 41 is pivotable around a horizontal axis 41H located on the right front of the slewing frame 30. The arm 42 is pivotable around a horizontal axis 42H located at the tip of the boom 41. The attachment 43 is pivotable around a horizontal axis 43H located at the tip of the arm 42. In this embodiment, an excavation bucket is provided as the attachment 43, but a breaker, auger, etc., may also be provided.

[0027] The hydraulic system includes a boom cylinder 41A, an arm cylinder 42A, and an attachment cylinder 43A (all examples of actuators) that drive the boom 41, arm 42, and attachment 43, respectively. The hydraulic system supplies hydraulic fluid from a tank (not shown) to the boom cylinder 41A, arm cylinder 42A, and attachment cylinder 43A via a hydraulic pump (not shown) driven by power generated by the prime mover 31. The hydraulic fluid is pressurized by the hydraulic pump and its direction and flow rate are regulated by a control valve (not shown). This hydraulic fluid is then used as a power transmission medium to drive the boom cylinder 41A, arm cylinder 42A, and attachment cylinder 43A.

[0028] [boom] The boom 41 (see Figures 3 and 4) is composed of multiple members and includes a first boom 51 that forms the base end of the boom 41, a second boom 52 that forms the middle part of the boom 41, and a third boom 53 that forms the tip end of the boom 41. The base end of the first boom 51 is supported by the upper slewing body 3. The base end of the second boom 52 is supported by the tip end of the first boom 51, and its tip end supports the base end of the third boom 53. The arm cylinder 42A is supported by the third boom 53.

[0029] The first boom 51 is pivotable around the horizontal axis 41H. The first boom 51 pivots by the extension and retraction of the boom cylinder 41A, which is connected to the first boom 51 and the slewing frame 30. The tip of the first boom 51 is provided with a vertical axis 51V perpendicular to the horizontal axis 41H. The second boom 52 is pivotable around the vertical axis 51V. The tip of the second boom 52 is provided with a vertical axis 52V parallel to the vertical axis 51V. The third boom 53 is pivotable around the vertical axis 52V.

[0030] A rod bracket 51RB is provided on the left side of the tip of the first boom 51, and a rod bracket 53RB is provided on the left side of the third boom 53. Rod brackets 51RB and 53RB are provided with rod vertical axes 51RV and 53RV, respectively, which are parallel to the vertical axis 51V of the first boom 51 and the vertical axis 52V of the second boom 52 (see Figure 4). The offset rod 55 is positioned parallel to the second boom 52 along its left side. The base end of the offset rod 55 is attached to the rod vertical axis 51RV, and the tip of the offset rod 55 is attached to the rod vertical axis 53RV. The vertical axes 51V, 52V and the rod vertical axes 53RV, 51RV are positioned at the vertices of a parallelogram. The first boom 51, the second boom 52, the third boom 53, and the offset rod 55 constitute a parallel four-bar linkage.

[0031] A cylinder bracket 52CB is provided on the base side of the left side of the second boom 52, and a cylinder bracket 53CB is provided on the left side of the third boom 53. The cylinder bracket 52CB is provided below the rod bracket 51RB, and the cylinder bracket 53CB is provided below the rod bracket 53RB. The cylinder brackets 52CB and 53CB are provided with cylinder vertical axes 52CV and 53CV, respectively, which are perpendicular to the horizontal axis 41H. The offset cylinder 56 is connected to the cylinder vertical axis 52CV and the cylinder vertical axis 53CV. The offset cylinder 56 may also be connected to the first boom 51 and the second boom 52.

[0032] Figures 5 and 6 are plan views showing the offset operation of the work machine 4. As described above, a parallel four-bar linkage is formed by the first boom 51, the second boom 52, the third boom 53, and the offset rod 55. Therefore, the second boom 52 swings from side to side around the vertical axis 51V while maintaining parallelism with the offset rod 55. As the second boom 52 swings, the third boom 53 moves in parallel with the first boom 51. Here, the movement of the third boom 53 in parallel with the first boom 51 is called offset. The attitude of the third boom 53 relative to the first boom 51 is classified into a right offset state where the third boom 53 is offset to the right of the first boom 51, a left offset state where the third boom 53 is offset to the left of the first boom 51, and a non-offset state where the third boom 53 is not offset.

[0033] When the offset cylinder 56 extends (see Figure 5), the third boom 53 attempts to swing clockwise relative to the second boom 52. However, because the offset rod 55 keeps the distance between the rod vertical axis 51RV and the rod vertical axis 53RV constant, the second boom 52 swings counterclockwise, and the third boom 53 moves parallel to the left (left offset state). On the other hand, when the offset cylinder 56 retracts (see Figure 6), the third boom 53 attempts to swing counterclockwise relative to the second boom 52. However, because the offset rod 55 keeps the distance between the rod vertical axis 51RV and the rod vertical axis 53RV constant, the second boom 52 swings clockwise, and the third boom 53 moves parallel to the right (right offset state).

[0034] Next, the mounting structure of the valve device 60 will be described. For convenience, the front-rear direction will be described as the axial direction of the offset cylinder 56 and the second boom 52. Figure 7 is a left side view showing the main part of the boom 41. Figure 8 is a front view showing the offset cylinder 56. Figure 9 is a rear view showing the offset cylinder 56. Figure 10 is a bottom view showing the main part of the boom 41. Figure 11 is a top view showing the main part of the boom 41.

[0035] The mounting structure of the valve device 60 according to this embodiment comprises an offset cylinder 56 (an example of a fluid cylinder) having a first port 561, a valve device 60 having a second port 602, and a first flow path 61 connecting the first port 561 and the second port 602, with the first port 561 and the second port 602 facing each other when viewed from the axial direction of the offset cylinder 56. Specifically, it is as follows.

[0036] [Offset Cylinder] The offset cylinder 56 (see Figure 7) comprises a cylinder tube 56T, a cap 56C, a piston 56P, a piston rod 56R, and a rod head 56H.

[0037] The cylinder tube 56T is formed in a cylindrical shape. A cap 56C is provided at the rear end of the cylinder tube 56T. The cap 56C has a hole into which the cylinder vertical shaft 52CV (see Figures 10 and 11) is inserted and is pivotably supported by the cylinder bracket 52CB. The piston 56P is housed inside the cylinder tube 56T. The rear end of the piston rod 56R is coupled to the piston 56P, and the front end of the piston rod 56R is exposed forward of the front end of the cylinder tube 56T. A rod head 56H is provided at the front end of the piston rod 56R. The rod head 56H has a hole into which the cylinder vertical shaft 53CV is inserted and is pivotably supported by the cylinder bracket 53CB.

[0038] The internal space of the cylinder tube 56T is divided into a rod-side space 56r located in front of the piston 56P (rod side) and a bottom-side space 56b located behind the piston 56P (bottom side). A first port 561, which connects to the rod-side space 56r, is provided at the upper part near the front end of the cylinder tube 56T. A third port 563, which connects to the bottom-side space 56b, is provided at the upper part near the rear end of the cylinder tube 56T.

[0039] [Valve device] The valve device 60 (see Figures 7 to 9) is located above the cylinder tube 56T. In other words, the valve device 60 is positioned in either the first direction (left-right direction) in which the second boom 52 is positioned relative to the offset cylinder 56, or in the second direction (up-down direction) which intersects the axial direction (front-back direction) (in this example, upward).

[0040] The valve device 60 is formed in the shape of a rectangular parallelepiped. The length of the valve device 60 in the front-to-rear direction is shorter than the length of the cylinder tube 56T in the front-to-rear direction. The valve device 60 is located on the front end side of the cylinder tube 56T. A second port 602 and a fourth port 604 are provided on the lower surface of the valve device 60. The fourth port 604 is located behind the second port 602.

[0041] When viewed from the offset cylinder 56 side, the width W60 of the valve device 60 in the direction intersecting the axial direction is less than or equal to the width W56 of the offset cylinder 56 (see Figures 8 and 9). Therefore, when viewed from below (see Figure 10) and above (see Figure 11), the valve device 60 does not protrude from the left and right ends of the offset cylinder 56 in the left and right directions. In other words, when viewed from the offset cylinder 56 side, the entire valve device 60 is shielded by the offset cylinder 56.

[0042] The offset cylinder 56 is supplied with hydraulic fluid, whose direction and flow rate are regulated by the aforementioned control valve, via the valve device 60. As hydraulic fluid is supplied to the bottom space 56b and discharged from the rod space 56r, the piston rod 56R is pushed forward, and the third boom 53 moves parallel to the left. Also, as hydraulic fluid is supplied to the rod space 56r and discharged from the bottom space 56b, the piston rod 56R is pulled backward, and the third boom 53 moves parallel to the right.

[0043] Check valves (not shown) are provided at the second port 602 and the fourth port 604. The check valve at the second port 602 functions as a check valve that blocks the outflow of hydraulic fluid from the rod-side space 56r. The check valve at the fourth port 604 functions as a check valve that blocks the outflow of hydraulic fluid from the bottom-side space 56b. If the hydraulic pressure drops due to a rupture or detachment of the hose (not shown) connecting the hydraulic pump and the valve device 60, the two check valves close in conjunction with the control valve, maintaining the load in the rod-side space 56r and the bottom-side space 56b, preventing the offset cylinder 56 from extending or retracting. As a result, the work machine 4 is maintained in the position when the check valves are closed, preventing unexpected changes in posture.

[0044] [First channel, second channel] The valve device 60 (see Figures 7 to 9) is arranged so that the first port 561 and the second port 602 face each other in the vertical direction. In other words, the first port 561 and the second port 602 face each other when viewed from the axial direction (see Figures 8 and 9) and when viewed from a direction intersecting the axial direction (see Figure 7). The first port 561 and the second port 602 are connected by a first flow path 61 that runs along the vertical direction. The first flow path 61 is positioned so as not to protrude from the space A between the offset cylinder 56 and the valve device 60 when viewed from the axial direction of the offset cylinder 56 (see Figures 8 and 9).

[0045] On the other hand, the fourth port 604 is located in front of the third port 563. In other words, when viewed from a direction intersecting the axial direction (see Figure 7), the third port 563 and the fourth port 604 are not facing each other, but when viewed from the axial direction (see Figures 8 and 9), the third port 563 and the fourth port 604 are facing each other. The third port 563 and the fourth port 604 are connected by a second flow path 62 that runs along the front-rear direction. The second flow path 62 is positioned so as not to protrude from the space A between the offset cylinder 56 and the valve device 60 when viewed from the axial direction of the offset cylinder 56 (see Figures 8 and 9).

[0046] The first passage 61 has the function of guiding hydraulic fluid as well as supporting the valve device 60. The second passage 62 has the function of guiding hydraulic fluid but does not have the function of supporting the valve device 60. Therefore, the first passage 61 has higher rigidity than the second passage 62. In order to increase the rigidity of the first passage 61, the diameter of the first passage 61 is set to be larger than the diameter of the second passage 62.

[0047] [Offset Rod] The offset rod 55 (see Figure 7) is positioned above or below the offset cylinder 56 (above in this embodiment) and parallel to the second boom 52, and is connected to the first boom 51 and the third boom 53. The valve device 60 is positioned between the offset cylinder 56 and the offset rod 55.

[0048] The upper part of the valve device 60 protrudes above the second boom 52. Therefore, the offset rod 55 is positioned above the second boom 52, and a gap is formed between the second boom 52 and the offset rod 55 when viewed from a direction intersecting the axial direction (see Figure 7).

[0049] According to the mounting structure of the valve device 60 of this embodiment described above, the valve device 60 comprises an offset cylinder 56 (an example of a fluid cylinder) having a first port 561, a valve device 60 having a second port 602, and a first flow path 61 connecting the first port 561 and the second port 602, with the first port 561 and the second port 602 facing each other when viewed from the axial direction of the offset cylinder 56. With this configuration, the first flow path 61 can be positioned so as not to protrude from the space A between the offset cylinder 56 and the valve device 60 when viewed from the axial direction of the offset cylinder 56, thereby protecting the first flow path 61, the first port 561 and the second port 602 from obstacles.

[0050] Furthermore, according to the mounting structure of the valve device 60 in this embodiment, the first port 561 and the second port 602 face each other when viewed from a direction intersecting the axial direction. With this configuration, the first flow path 61 can be formed so as to linearly connect the first port 561 and the second port 602, thereby improving the rigidity of the first flow path 61 and enabling the valve device 60 to be supported by the first flow path 61. As a result, the number of parts can be reduced and the weight can be reduced.

[0051] Furthermore, according to the mounting structure of the valve device 60 in this embodiment, the width W60 of the valve device 60 in the direction intersecting the axial direction, as viewed from the offset cylinder 56 side, is less than or equal to the width W56 of the offset cylinder 56. With this configuration, as viewed from the offset cylinder 56 side, the entire valve device 60 is shielded by the offset cylinder 56, thus protecting the valve device 60 from obstacles on the offset cylinder 56 side.

[0052] Furthermore, according to the mounting structure of the valve device 60 in this embodiment, the work implement 4 is driven by an offset cylinder 56, and the valve device 60 is positioned in a second direction that intersects the first direction in which the work implement 4 is positioned with respect to the offset cylinder 56 and the axial direction. With this configuration, the valve device 60 can be protected from obstacles in the second direction.

[0053] Furthermore, according to the mounting structure of the valve device 60 in this embodiment, the work machine 4 comprises a first boom 51, a second boom 52 swingably connected to the first boom 51 in the left-right direction, a third boom 53 swingably connected to the second boom 52 in the left-right direction, an offset cylinder 56 connected to the second boom 52 and the third boom 53, and an offset rod 55 positioned above or below the offset cylinder 56 and parallel to the second boom 52, and connected to the first boom 51 and the third boom 53. The valve device 60 is positioned between the offset cylinder 56 and the offset rod 55. With this configuration, the valve device 60 can be protected from obstacles above or below it.

[0054] Furthermore, according to the mounting structure of the valve device 60 in this embodiment, the upper part of the valve device 60 protrudes above the second boom 52. With this configuration, the offset cylinder 56 is positioned higher, so the offset cylinder 56 can be more safely protected from obstacles below it. Also, since the offset rod 55 is positioned above the second boom 52, the offset rod 55 does not interfere with the second boom 52 even when the offset amount is increased, so the offset amount can be increased. In addition, a gap is formed between the second boom 52 and the offset rod 55, so the view above the second boom 52 can be improved.

[0055] Furthermore, according to the mounting structure of the valve device 60 in this embodiment, the valve device 60 includes a third port 563 provided in the offset cylinder 56, a fourth port 604 provided in the valve device 60, and a second flow path 62 connecting the third port 563 and the fourth port 604, with the third port 563 and the fourth port 604 facing each other when viewed from the axial direction. With this configuration, the second flow path 62 can be positioned so as not to protrude from the space A between the offset cylinder 56 and the valve device 60 when viewed from the axial direction of the offset cylinder 56, thereby protecting the second flow path 62, the third port 563 and the fourth port 604 from contact with obstacles.

[0056] Furthermore, according to the mounting structure of the valve device 60 in this embodiment, the axial positions of the third port 563 and the fourth port 604 are different. With this configuration, the position of the valve device 60 is not constrained by the position of the third port 563, thus increasing the degree of design freedom.

[0057] Furthermore, according to the mounting structure of the valve device 60 in this embodiment, the outer diameter of the first passage 61 and the outer diameter of the second passage 62 are different. With this configuration, by making the outer diameter of either the first passage 61 or the second passage 62 larger than the other, the valve device 60 can be provided with a supporting function, thereby reducing the number of parts and achieving weight reduction.

[0058] Furthermore, according to the mounting structure of the valve device 60 in this embodiment, the outer diameter of the first flow path 61 is larger than the outer diameter of the second flow path 62. With this configuration, the first flow path 61 can be given the function of supporting the valve device 60.

[0059] Furthermore, according to the mounting structure of the valve device 60 in this embodiment, the valve device 60 is positioned at one end of the offset cylinder 56. With this configuration, by increasing the outer diameter of either the first passage 61 or the second passage 62, the valve device 60 can be supported, thereby reducing the number of parts and achieving weight reduction.

[0060] The above embodiment may be modified as follows.

[0061] In the above embodiment, an example was shown in which the valve device 60 is positioned in a second direction that intersects the first direction in which the work implement 4 is positioned relative to the offset cylinder 56 and the axial direction. However, the valve device 60 may also be positioned between the offset cylinder 56 and the work implement 4. This configuration also protects the valve device 60 from obstacles on both the offset cylinder 56 side and the work implement 4 side.

[0062] In the above embodiment, an example was shown in which the valve device 60 is located on the rod side, but the valve device 60 may also be located on the bottom side.

[0063] In the above embodiment, an example in which the present invention is applied to an offset cylinder 56 is shown, but the present invention may also be applied to fluid cylinders other than the offset cylinder 56. For example, in the case of a boom cylinder 41A, a cap 56C is connected to the track frame 22, and a rod head 56H is connected to the first boom 51. The first port 561 is provided in the bottom space 56b. The valve device 60 is provided with the second port 602 facing the first port 561, and the first port 561 and the second port 602 are connected by the first flow path 61. The third port 563, the fourth port 604, and the second flow path 62 are not provided. Even with this configuration, the first flow path 61, the first port 561, and the second port 602 can be protected from obstacles. The valve device 60 may also be provided between the boom cylinder 41A and the boom 41. With this configuration, the valve device 60 can be protected from obstacles.

[0064] This modified example also includes an offset cylinder 56 (an example of a fluid cylinder) having a first port 561, a valve device 60 having a second port 602, and a first flow path 61 connecting the first port 561 and the second port 602, and is an example of a mounting structure for a valve device 60 in which the first port 561 and the second port 602 face each other when viewed from the axial direction of the offset cylinder 56.

[0065] <Note> The above embodiment can be specified as follows.

[0066] <Note 1> A fluid cylinder having a first port, A valve device having a second port, The device comprises a first channel connecting the first port and the second port, A mounting structure for a valve device characterized in that the first port and the second port face each other when viewed from the axial direction of the fluid cylinder.

[0067] <Note 2> The mounting structure for the valve device according to Appendix 1, characterized in that the first port and the second port face each other when viewed from a direction intersecting the axial direction. <Note 3>

[0068] The mounting structure for the valve device according to Appendix 1 or 2, characterized in that, when viewed from the fluid cylinder side, the width of the valve device in a direction intersecting the axial direction is less than or equal to the width of the fluid cylinder.

[0069] <Note 4> The work machine is driven by the aforementioned fluid cylinder, The valve device mounting structure according to any one of appendices 1 to 3, characterized in that the valve device is arranged in a second direction that intersects the first direction in which the work machine is positioned with respect to the fluid cylinder and the axial direction.

[0070] <Note 5> The work machine is driven by the aforementioned fluid cylinder, The valve device mounting structure according to any one of the appendices 1 to 3, characterized in that the valve device is located between the fluid cylinder and the work machine.

[0071] <Note 6> The aforementioned work machine is, The first boom and A second boom is connected to the first boom so as to be able to swing in the left-right direction, A third boom is connected to the second boom so as to be able to swing in the left-right direction, The fluid cylinder connected to the second boom and the third boom, The system includes an offset rod positioned above or below the fluid cylinder, parallel to the second boom, and connected to the first boom and the third boom. The valve device mounting structure according to Appendix 4, characterized in that the valve device is positioned between the fluid cylinder and the offset rod.

[0072] <Note 7> The mounting structure for the valve device according to Appendix 6, characterized in that the upper part of the valve device protrudes above the second boom.

[0073] <Note 8> A third port provided in the fluid cylinder, A fourth port provided in the valve device, The device comprises a second channel connecting the third port and the fourth port, The mounting structure for the valve device according to any one of appendices 1 to 7, characterized in that the third port and the fourth port face each other when viewed from the axial direction.

[0074] <Note 9> The mounting structure for the valve device according to Appendix 8, characterized in that the axial positions of the third port and the fourth port are different.

[0075] <Note 10> The mounting structure for the valve device according to claim 8 or 9, characterized in that the outer diameter of the first flow path and the outer diameter of the second flow path are different.

[0076] <Note 11> The mounting structure for the valve device according to Appendix 10, characterized in that the outer diameter of the first flow path is larger than the outer diameter of the second flow path.

[0077] <Note 12> The valve device mounting structure according to any one of the appendices 1 to 11, characterized in that the valve device is located at one end of the fluid cylinder. [Explanation of Symbols]

[0078] 4. Work equipment 51. First Boom 52. Second Boom 53. The Third Boom 55 Offset Rod 56. Offset Cylinder (Fluid Cylinder) 561 Port 1 563 Port 3 60 Valve device 602 Port 2 604 Port 4 61 First channel 62 Second channel

Claims

1. A fluid cylinder having a first port, A valve device having a second port, A first channel connecting the first port and the second port, When viewed from the axial direction of the fluid cylinder, the first port and the second port face each other. The work machine is driven by the aforementioned fluid cylinder, The valve device mounting structure is characterized by being positioned between the fluid cylinder and the work machine.

2. A fluid cylinder having a first port, A valve device having a second port, A first channel connecting the first port and the second port, When viewed from the axial direction of the fluid cylinder, the first port and the second port face each other. The work machine is driven by the aforementioned fluid cylinder, The valve device is positioned relative to the fluid cylinder in a second direction that intersects the first direction in which the work machine is positioned and the axial direction. The aforementioned work machine is, The first boom and A second boom is connected to the first boom so as to be able to swing in the left-right direction, A third boom is connected to the second boom so as to be able to swing in the left-right direction, The fluid cylinder connected to the second boom and the third boom, The fluid cylinder is positioned above or below the second boom and parallel to the second boom, and includes an offset rod connected to the first boom and the third boom, The valve device mounting structure is characterized by being positioned between the fluid cylinder and the offset rod.

3. A fluid cylinder having a first port, A valve device having a second port, A first channel connecting the first port and the second port, When viewed from the axial direction of the fluid cylinder, the first port and the second port face each other. A third port provided in the fluid cylinder, A fourth port provided in the valve device, The device comprises a second channel connecting the third port and the fourth port, A mounting structure for a valve device, characterized in that the third port and the fourth port are facing each other when viewed from the axial direction.

4. The mounting structure for a valve device according to any one of claims 1 to 3, characterized in that the first port and the second port face each other when viewed from a direction intersecting the axial direction.

5. The mounting structure for a valve device according to any one of claims 1 to 3, characterized in that, when viewed from the fluid cylinder side, the width of the valve device in a direction intersecting the axial direction is less than or equal to the width of the fluid cylinder.

6. The work machine is driven by the aforementioned fluid cylinder, The mounting structure for the valve device according to claim 1 or 3, characterized in that the valve device is arranged in a second direction that intersects the first direction in which the work machine is positioned with respect to the fluid cylinder and the axial direction.

7. The mounting structure for the valve device according to claim 2, characterized in that the upper part of the valve device protrudes above the second boom.

8. The mounting structure for the valve device according to claim 3, characterized in that the axial positions of the third port and the fourth port are different.

9. The mounting structure for the valve device according to claim 3 or 8, characterized in that the outer diameter of the first flow path and the outer diameter of the second flow path are different.

10. The mounting structure for the valve device according to claim 9, characterized in that the outer diameter of the first flow path is larger than the outer diameter of the second flow path.

11. The valve device mounting structure according to claim 1, characterized in that the valve device is located at one end of the fluid cylinder.

Images