Specially equipped vehicle

Abstract

To provide a specially equipped vehicle having a check valve capable of preventing the occurrence of interference with other components.SOLUTION: A working machine mounted on a vehicle and having a hydraulically driven actuator, a hydraulic pipe, a valve block 5 fixed to the working machine and provided with a valve for adjusting oil feeding of the hydraulic pipe, and a check valve 6 fixed to the valve block 5, wherein the hydraulic pipe has one end connected to the valve block 5 and the other end connected to the actuator, the check valve 6 has, at an end portion thereof, an operated portion 61 that receives an external force related to an operation of fixing the check valve 6 to the valve block 5, and the valve block 5 is provided with a hydraulic pipe fixing hole 51 for fixing the hydraulic pipe and a check valve fixing hole 52 for fixing the check valve 6, An end edge 611 at the end of the operated part 61 is located at the same position in the inside-outside direction as the opening edge of the check valve fixing hole 52 opened on the surface of the valve block 5, or located inside the opening edge.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a specially equipped vehicle such as a container transport vehicle. [Background technology]

[0002] BACKGROUND ART Container transport vehicles, which are a type of specially equipped vehicle, have been known for some time. This container transport vehicle is described in Patent Document 1, for example.

[0003] The container transport vehicle described in Patent Document 1 is provided with a valve block equipped with an oil passage for swinging the hook arm, and this valve block and a hydraulic cylinder, which is an actuator, are connected by hydraulic piping. A check valve (non-return valve) equipped with a bolt head at its tip is fixed to the valve block.

[0004] However, in the container transport vehicle described in Patent Document 1, the bolt head of the check valve protrudes beyond the surface of the valve block, and therefore, in the limited space on the specially equipped vehicle, there is a possibility that the hydraulic piping will interfere with the bolt head of the check valve. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 4177797 (paragraph 0022, Figure 4) Summary of the Invention [Problem to be solved by the invention]

[0006] Therefore, an object of the present invention is to provide a specially equipped vehicle equipped with a check valve that can prevent interference with other components. [Means for solving the problem]

[0007] One configuration of the present invention is a specially equipped vehicle comprising: a vehicle; a work machine mounted on the vehicle, having a hydraulically driven actuator, and performing work on the vehicle by the driving force of the actuator; hydraulic piping arranged for the hydraulic drive; a valve block fixed to the work machine and for accommodating a valve for adjusting the oil supply of the hydraulic piping; and a check valve fixed to the valve block, wherein one end of the hydraulic piping is connected to the valve block and the other end is connected to the actuator, and the check valve has an operated part at its end that receives an external force related to the operation of fixing it to the valve block, and the valve block is provided with a hydraulic piping fixing hole for fixing the hydraulic piping and a check valve fixing hole for fixing the check valve, and the edge at the end of the operated part is located in the same position in the inward and outward directions as the opening edge of the check valve fixing hole that opens into the surface of the valve block, or is located more inward than the opening edge.

[0008] According to the above configuration, the operated portion does not protrude from the check valve fixing hole, so that the hydraulic piping can be prevented from interfering with the operated portion of the check valve.

[0009] Furthermore, the one end of the hydraulic piping can be connected to a specific surface which is one of the surfaces of the valve block, the fixing hole for the hydraulic piping can be a threaded hole, and both the fixing hole for the hydraulic piping and the fixing hole for the check valve can be provided on the specific surface of the valve block.

[0010] According to the above configuration, when the hydraulic pipe and the check valve are adjacent to each other on a specific surface of the valve block, the operated part does not protrude from the check valve fixing hole. Therefore, when the hydraulic pipe is screwed in with a tool such as a wrench, the tool does not interfere with the operated part of the check valve, making the fixing work easier.

[0011] Furthermore, the specially equipped vehicle may be a container transport vehicle capable of attaching and detaching a container to and from the vehicle, and may include a subframe mounted on the vehicle, a dump arm rotatably attached to the subframe and capable of dumping the container onto the vehicle, a lift arm rotatably attached to the dump arm and capable of lifting the container, and a hook arm movably attached to the lift arm and capable of engaging and disengaging with the container, at least a portion of the hydraulic piping being a flexible hose, and the valve block may be disposed between the rear of the hook arm and the driver's cab of the vehicle.

[0012] According to the above configuration, in a container transport vehicle, when a valve block is installed in the narrow space between the rear of the hook arm and the vehicle's driver's cab, which causes hoses to become crowded, it is possible to prevent the hoses from interfering with the operated part and being damaged, etc. [Effects of the Invention]

[0013] According to the present invention, a specially equipped vehicle can be provided that is equipped with a check valve that can prevent interference with other components. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a side view of the left side of a specially equipped vehicle (container transport vehicle) according to an embodiment of the present invention. [Figure 2] FIG. 2 is a front view of the specially equipped vehicle, showing a hook arm mounted on the specially equipped vehicle and its surroundings, as viewed from the front side of the specially equipped vehicle. [Figure 3] FIG. 3 is a hydraulic circuit diagram for driving the hook arm and the like. [Figure 4] 1A and 1B show a valve block of the present embodiment, in which FIG. 1A is a plan view and FIG. 1B is a front view showing the internal structure. DETAILED DESCRIPTION OF THE INVENTION

[0015] Next, one embodiment of the present invention will be described. This embodiment is a specially equipped vehicle, specifically a container carrier 1 that can be attached to and detached from a drivable vehicle to accommodate transported goods, and that can travel with the container attached. Note that the directional expressions (up, down, left, right, front, back) below are based on the direction in which the container carrier 1 is normally positioned.

[0016] A container transport vehicle 1, which is a specially equipped vehicle in this embodiment, mainly comprises a vehicle 2, a work machine 3, hydraulic piping 4, a valve block 5, and a check valve 6. The vehicle 2 mainly comprises a driver's cab 21, a chassis frame 22, and a traveling device made up of various devices necessary for the traveling of the vehicle 2. A subframe 23 that supports the work machine 3 is mounted on the chassis frame 22.

[0017] First, an outline of the container transport vehicle 1 will be explained. As shown in Fig. 1, the vehicle 2 is equipped with a driver's cab 21 in front of a pair of left and right chassis frames 22, and a pair of left and right sub-frames 23 above the chassis frames 22. A container (not shown) can be mounted on these sub-frames 23. The container is configured, for example, as a rectangular parallelepiped box that is open at the top, and transported objects can be placed into it from above. Although not shown, the container has an engagement portion at its front that can engage with a hook 321 of a hook arm 32, which will be described later, and an openable door at its rear (rear face)

[0018] 1, a pair of left and right guide rollers 24 protruding outward in the left-right direction are rotatably attached to the rear end of the subframe 23. These guide rollers 24 rotate to guide the container when the container on the subframe 23 is lowered to the ground or when the container is loaded onto the subframe 23 from the ground.

[0019] Here, the work implement 3 is further mounted on a subframe 23 which is mounted on the chassis frame 22 of the vehicle 2. The work implement 3 has a hydraulically driven actuator. The driving force of this actuator causes the work implement 3 to perform work on the vehicle 2. The container transport vehicle 1 of this embodiment is equipped with a dump arm (not shown) which is rotatably mounted on the subframe 23 and is capable of dumping a container onto the vehicle 2, a lift arm 31 which is rotatably mounted on the dump arm and is capable of lifting the container, and a hook arm 32 which is movably mounted on the lift arm 31 and is capable of engaging and disengaging with the container.

[0020] Each part of the work machine 3 will now be described. The rear ends of a pair of left and right dump arms (hidden by the subframe in FIG. 1 and not shown) are pivotally supported on the rear end of the subframe 23, and the dump arms are configured to be tiltable about left and right horizontal axes. The dump arms are made up of vertical frames that are long in the front-to-rear direction, and horizontal frames that connect these vertical frames together in the left-to-right direction. The rear ends of a lift arm 31 are attached to the front middle of the vertical frames by a support shaft so that they can rotate integrally with the vertical frames. This lift arm 31 is located between the pair of dump arms. The middle parts of the lift arm 31 and the front end of the subframe 23 are connected by a pair of hydraulic lift cylinders (not shown). By extending and retracting these lift cylinders, the lift arm 31 can be rotated about the support shaft.

[0021] The base end of the hook arm 32, which is substantially L-shaped in a side view, is attached to the front end of the lift arm 31 so as to be rotatable about a horizontal axis in the left-right direction. The hook arm 32 is configured to be able to swing (swing) rearward. The upper end of the hook arm 32 is equipped with a substantially C-shaped hook 321 that engages with an engagement portion provided on the front side of the container. A hydraulic swing cylinder 71 serving as an actuator is connected between the middle portion of the hook arm 32 and the front end of the lift arm 31, and the swing angle of the hook arm 32 relative to the vehicle body can be changed by extending and retracting this swing cylinder 71.

[0022] Next, the hydraulic piping 4 is arranged on the vehicle 2 for hydraulic drive. One end of the hydraulic piping 4 is connected to the valve block 5, and the other end is connected to the swing cylinder 71. At least a portion of the hydraulic piping 4 can be a flexible hose.

[0023] The hydraulic circuit of this embodiment is configured as shown in Figure 3 and mainly includes the swing cylinder 71 for swinging the hook arm 32, a lift cylinder 72 for operating the lift arm 31, an oil tank 73, a hydraulic pump 74, a solenoid valve 75, and a check valve 6. The oil paths to the oil tank 73 and the hydraulic pump 74 are switched by a solenoid valve 75 located within an area A surrounded by a two-dot chain line in the figure.

[0024] As shown in FIGS. 4( a) and 4(b), the valve block 5 is a hexahedral steel block. As shown by the dashed lines in FIG. 4(b), the interior of the valve block 5 is formed with a space through which hydraulic oil passes to generate hydraulic driving force, and a space in which a valve (valve mechanism) that adjusts oil supply to the hydraulic piping 4 is provided. In this embodiment, the valve is a check valve 6. The valve block 5 is fixed to the work machine 3. Specifically, it is fixed to the hook arm 32. More specifically, as shown in FIG. 2, it is fixed to the side surface of a swing cylinder 71 connected to the hook arm 32. Note that the circular portion not indicated with a reference numeral in FIG. 4(b) is a through-hole for fixing the valve block 5 to the swing cylinder 71. This fixation positions the valve block 5 at the rear of the hook arm 32, specifically between the rear end face and the cab 21 of the vehicle 2. In a typical design of a container transport vehicle 1, the hook arm 32 is provided immediately behind the driver's cab 21, and the hydraulic mechanism for driving (swinging) the hook arm 32 is fixed to the hook arm 32. As a result, the valve block 5 is provided in the narrow space between the rear of the hook arm 32 (which roughly coincides with the front of the container when loaded) and the driver's cab 21 of the vehicle 2. Due to this installation situation, the hydraulic piping 4 may become congested around the valve block 5. For example, this situation becomes more pronounced in small, specially equipped vehicles manufactured as vehicles 2 from small freight vehicles such as 2-ton trucks. In contrast, the valve block 5 of this embodiment has a configuration that will be described later.

[0025] The check valve 6 is fixed to the valve block 5. FIG. 4(b) shows the valve block 5 (indicated by a dashed line) with the check valve 6 fixed thereto. The check valve 6 is separate from the valve block 5 and is incorporated into the valve block 5. The check valve 6 of this embodiment has the same configuration as a general check valve (non-return valve), with a spring-supported valve element housed in a case. It basically allows hydraulic oil to flow from one port to the other, but prevents flow in the reverse direction. The check valve 6 of this embodiment uses a pilot check valve and is provided with a separate pilot pressure port. When pressure is applied to the pilot pressure port, flow in the reverse direction is also permitted. The overall shape of the check valve 6 is cylindrical (columnar).

[0026] The purpose of providing the check valve 6 in the hydraulic circuit of this embodiment is to restrict the extension of the swing cylinder 71, thereby preventing the hook arm 32 from swinging backward when the dump arm is dumped, because the weight of the container acts on the hook arm 32 and causes a force to swing the hook arm 32 backward. On the other hand, when loading or unloading a container onto or from the vehicle 2, the hook arm 32 must be swung backward. In this situation, the swing cylinder 71 must be extended. To accommodate these two situations, this embodiment uses a pilot check valve as the check valve 6. The pilot check valve allows backflow within the valve, provided that pressure (pilot pressure) is present on the head side of the swing cylinder 71. The presence of pilot pressure means that the swing cylinder 71 is operating, so allowing backflow does not impede the extension of the swing cylinder 71. This allows the hydraulic oil on the rod side of the swing cylinder 71 to flow through the check valve 6, thereby extending the swing cylinder 71 and allowing the hook arm 32 to swing backward without any hindrance.

[0027] The check valve 6 is fixed to the valve block 5 by screwing. For this reason, the check valve 6 has an operated part 61 at its end that receives the external force associated with the operation of fixing it to the valve block 5. The check valve 6 is a substantially cylindrical unit with a port opening on the side, and in this embodiment the operated part 61 is a hexagon bolt head so that it can be engaged with a tool for a hexagon bolt.

[0028] As shown in FIGS. 4(a) and 4(b), the valve block 5 is provided with a hydraulic pipe fixing hole 51, which is a tapped hole with threads formed on the inner periphery for fixing the hydraulic pipe 4, which has a thread formed on the end, and a check valve fixing hole 52 for fixing the check valve 6. As shown in FIG. 3, the hydraulic pipe fixing hole 51 in the valve block 5 is a port for connecting oil passages to an oil tank 73 and a hydraulic pump 74. Note that the connection to the oil tank 73 and the hydraulic pump 74 is switched by a solenoid valve 75. In this way, the hydraulic pipe 4 fixed to the hydraulic pipe fixing hole 51 is a pipe directed toward the vehicle 2. In addition, the check valve fixing hole 52 is a hole with a larger diameter than the diameter of the operated portion 61 of the check valve 6.

[0029] An edge 611 (the upper edge in this embodiment) at the axial end of the check valve 6 in the operated portion 61 is recessed in the check valve fixing hole 52. In other words, it is located more inward than the opening edge of the check valve fixing hole 52 that opens into the surface of the valve block 5. In addition to the state in this embodiment, it may be in the same position in the inner and outer directions as the opening edge of the check valve fixing hole 52 (a so-called "flush" state).

[0030] This positional relationship eliminates the protrusion of the operated portion 61 from the check valve fixing hole 52. This prevents components located around the valve block 5, such as the hydraulic pipe 4, from interfering with the operated portion 61 of the check valve 6. Furthermore, during assembly work to construct the hydraulic circuit, the operated portion 61 (bolt head) of the check valve 6 is "buried" in the check valve fixing hole 52 of the valve block 5. Therefore, a tool that is attached to the bolt head from an extension of the axis of the check valve 6, such as a socket wrench, is used. Therefore, compared to tools used around the axis, such as a spanner or wrench, the tool used to secure the check valve 6 to the valve block 5 is less likely to interfere with the hydraulic pipe 4, even if the hydraulic pipe 4 is already secured to the valve block 5. Therefore, regardless of whether the hydraulic pipe 4 or the check valve 6 is secured to the valve block 5 first, the tool will not interfere with the other. This improves assembly workability.

[0031] Furthermore, one end of the hydraulic pipe 4 is connected to a specific surface 53, which is one of the surfaces of the valve block 5. As shown in FIGS. 4(a) and 4(b), the specific surface 53 in this embodiment is a rectangular flat surface. This specific surface 53 is provided with both a hydraulic pipe fixing hole 51 and a check valve fixing hole 52. For this reason, the hydraulic pipe 4 and the check valve 6 are adjacent to each other on the specific surface 53, which has limited area due to design considerations.

[0032] In this embodiment, in this adjacent state, it is possible to eliminate the protrusion of the operated portion 61 from the check valve fixing hole 52. Therefore, when the hydraulic piping 4 is screwed and fixed with a tool such as a wrench, the tool does not interfere with the operated portion 61 of the check valve 6, which improves the workability of the fixing work related to the hydraulic piping 4.

[0033] 2, the valve block 5 is fixed to the work machine 3 with the specific surface 53 facing downward. Therefore, the operated portion 61 of the check valve 6 is disposed facing downward inside the check valve fixing hole 52. Meanwhile, the hydraulic pipe 4 (particularly a flexible hose) fixed to the hydraulic pipe fixing hole 51 will sag due to its own weight. As a result of this sagging, the central axis direction of the hydraulic pipe 4 (hose) will be approximately aligned with the normal direction of the specific surface 53. Therefore, when the specific surface 53 of the valve block 5 faces downward as in this embodiment, the hydraulic pipe 4 is less likely to interfere with tools when fixing the check valve 6 to the valve block 5, compared to when the specific surface 53 faces sideways (where the hydraulic pipe 4 may sag along the specific surface 53). This also improves assembly workability from this perspective.

[0034] According to the present embodiment configured as described above, it is possible to provide a specially equipped vehicle equipped with a check valve 6 that can prevent interference with other components. In particular, in the case of a container transport vehicle 1, when the valve block 5 is provided in the narrow space between the rear of the hook arm 32 and the driver's cab 21 of the vehicle 2, and the hoses of the hydraulic piping 4 are concentrated, it is possible to prevent the hoses from interfering with the operated part 61 and being damaged.

[0035] Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment. For example, the specially equipped vehicle is not limited to the container transport vehicle 1, and may be various vehicles as long as it is capable of moving the work equipment 3 mounted (mounted) by hydraulic equipment. Furthermore, there is no particular limitation on the type of work performed by the work equipment 3.

[0036] The hydraulic piping 4 may be a pipe such as a rigid steel pipe. The operated part may be, for example, a screw head with a thread (such as a flathead thread) operated with a screwdriver or a tool engagement hole such as a hexagonal socket, or a striking head operated (struck) with a hammer or the like. The check valve 6 may be a counterbalance valve in which two valves are combined opposite each other. In the above embodiment, the hydraulic piping fixing screw hole 51 is a screw hole, but the method for fixing the hydraulic piping 4 to the valve block 5 is not particularly limited. [Explanation of symbols]

[0037] 1...container transport vehicle, 2...vehicle, 3...working machine, 4...hydraulic piping, 5...valve block, 6...check valve, 21...operator's cab, 22...chassis frame, 23...subframe, 24...guide roller, 31...lift arm, 32...hook arm, 51...fixing hole for hydraulic piping, 52...fixing hole for check valve, 53...specific surface, 61...operated part, 71...swing cylinder, 72...lift cylinder, 73...oil tank, 74...hydraulic pump, 75...solenoid valve, 321...hook, 611...edge, A...area (in hydraulic circuit)

Claims

1. Vehicles and a work machine mounted on the vehicle, having a hydraulically driven actuator, and performing work on the vehicle by using the driving force of the actuator; Hydraulic piping arranged for the hydraulic drive; a valve block fixed to the work machine for providing a valve for adjusting oil supply to the hydraulic piping; a check valve fixed to the valve block; One end of the hydraulic piping is connected to the valve block, and the other end is connected to the actuator, The check valve has an operated portion at an end thereof that receives an external force associated with an operation for fixing the check valve to the valve block, The valve block is provided with a hydraulic piping fixing hole for fixing the hydraulic piping and a check valve fixing hole for fixing the check valve, A specially equipped vehicle in which the edge at the end of the operated portion is located at the same position in the inward and outward directions as the opening edge of the fixing hole for the check valve that opens on the surface of the valve block, or is located more inward than the opening edge.

2. the one end of the hydraulic piping is connected to a specific surface that is one of the surfaces of the valve block; The hydraulic piping fixing holes are threaded holes, 2. The specially equipped vehicle according to claim 1, wherein the specific surface of the valve block is provided with both the hydraulic pipe fixing hole and the check valve fixing hole.

3. The specially equipped vehicle is a container transport vehicle that can attach and detach containers to and from the vehicle, a subframe mounted on the vehicle; a dump arm rotatably provided on the subframe and capable of dumping the container onto the vehicle; a lift arm rotatably provided on the dump arm and capable of lifting the container; a hook arm movably provided on the lift arm and capable of engaging and disengaging with the container; At least a portion of the hydraulic piping is a flexible hose, 3. The specially equipped vehicle according to claim 1, wherein the valve block is disposed between a rear portion of the hook arm and a driver's cab of the vehicle.

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