JP2015187460A - Power unit, and cargo bearer lifting device having the power unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power unit capable of protecting an oil tank by suppressing the deformation and damage of the oil tank.SOLUTION: A power unit comprises: an oil tank for reserving the working oil to be fed to an actuator for actuating a cargo bearer; a one-side end member for sealing a one-side opening on one side of the oil tank in the longitudinal direction of a cross member; an other-side end member for sealing the other-side opening on the other side of the oil tank in the longitudinal direction of the cross member; and a holding member having a length corresponding to the longitudinal length of at least the one side end member, the oil tank and the other side end member while the one side opening of the oil tank being sealed by the one-side end member, and the oil tank and the longitudinal length of the other side end member. The holding member is arranged separately on one side and the other side with respect to a plane to pass through the one-side end member and the other-side end member, thereby to hold the one side end member and the other side end member on one side and the other side of a plane passing the one side end member and the other side end member.

Description

  The present invention relates to a power unit that is a hydraulic drive source for operating a load receiving table lifting device provided in a cargo handling vehicle, and a load receiving device lifting device including the power unit.

  The following Patent Document 1 has been proposed as this type of power unit. The power unit of Patent Document 1 includes a gear pump, an oil tank, and a valve block. The gear pump, the oil tank, and the valve block are integrally fastened by four tie rods extending in the axial direction outside the oil tank.

  More specifically, one end of the tie rod is screwed to a pump flange provided on the gear pump, and the other end of the tie rod passes through a through hole formed in a corner of the valve block and is fixed to the valve block with a nut. Has been.

Japanese Patent No. 5311905

  In the power unit of Patent Document 1, the gear pump, the oil tank, and the valve block are fixed to each other so as to be compressed in the axial direction using a tie rod and a nut. By the way, the oil tank is generally less rigid than the gear pump and the valve block. For this reason, if the three members are fixed to each other so as to be compressed in the axial direction using a tie rod and a nut, the oil tank may be deformed or damaged.

  Accordingly, an object of the present invention is to provide a power unit that can protect the oil tank while suppressing deformation and damage of the oil tank, and a load receiving device lifting apparatus including the power unit.

  The present invention is a power unit that is a hydraulic drive source for operating a load receiving table provided in a vehicle in a state of being housed in a cross member provided in the vehicle, and is a hydraulic oil supplied to an actuator for operating the load receiving table. An oil tank that stores oil, a one-side end member that seals one side opening of the oil tank in the longitudinal direction of the cross member, and an other side opening of the other side of the oil tank in the longitudinal direction of the cross member. In the state where the other side end member to be sealed and the one side end member sealed the one side opening of the oil tank and the other side end member sealed the other side opening, at least one side end member, an oil tank, And a holding member having a length corresponding to the length in the longitudinal direction of the other side end member. The holding member has one side and the other side with respect to a surface passing through the one side end member and the other side end member. To be arranged separately, whereas the side edge members and the other end member, whereas it is characterized in that to hold the side edge members and the other one side of the plane passing through the end member and the other side.

  In the above configuration, the oil tank is held by holding one side end member that seals one side opening of the oil tank and the other side end member that seals the other side opening of the oil tank. Since the oil tank is not tightened from the longitudinal direction, the oil tank can be protected by suppressing damage and deformation of the oil tank.

  In the power unit of the present invention, the holding member can employ a configuration including a U-shaped portion having a U-shaped cross section perpendicular to the longitudinal direction.

  As described above, the holding member and the oil tank can be protected by securing the rigidity of the holding member with a U-shaped cross section.

  In the power unit of the present invention, the U-shaped portion is formed so as to protrude in the radial direction of the oil tank, and among the oil tank, the one side end member, and the other side end member, at least in the longitudinal direction of the oil tank. The structure in which the recessed part which accommodates a U-shaped part was formed in the outer peripheral surface along can be employ | adopted. According to this configuration, even if the recess is formed in the oil tank, since there is a portion that protrudes with respect to the recess, a decrease in the oil tank capacity can be minimized.

  In the power unit of the present invention, the holding member includes a cover portion that covers the electric wiring for supplying electric power for driving the power unit, and the electric wiring is disposed between the cover portion and the outer peripheral surface along the longitudinal direction of the oil tank. Can be adopted. According to this configuration, the electrical wiring can be protected by covering the electrical wiring with the cover portion.

  In the power unit of the present invention, the cover portion extends from the open end of the U-shaped portion, the recessed portion is wider than the U-shaped portion, and the electrical wiring is in the recessed portion in a state substantially parallel to the U-shaped portion. The configuration housed in the can be adopted.

  In the above configuration, since the strength of the holding member is increased because the U-shaped portion of the holding member is continuous in the longitudinal direction of the cross member, the holding member itself is prevented from being twisted, and thus the electrical wiring is more reliably performed. Can protect.

  In the power unit of the present invention, the oil tank includes an oil filler opening, the one side opening and the other side opening of the oil tank have a circular cross section, and the one side opening and the center of the other side opening are misaligned. Can be adopted.

  According to the above configuration, even if a rotational force around the longitudinal direction is applied to the oil tank as the oil moves, the one-side end member is misaligned with the center of the one-side opening and the other-side opening. In addition, the oil tank does not rotate with respect to any of the other side end members, and oil is prevented from leaking from the oil filler opening of the oil tank.

  The load receiving platform lifting apparatus according to the present invention is characterized in that the power unit described above can be pulled out along a longitudinal direction along the vehicle width direction to a cross member extending in the vehicle width direction.

  According to the cargo receiving platform lifting apparatus having the above-described configuration, the one-side end member that seals the one-side opening on one side of the oil tank, and the other-side end member that seals the other-side opening on the other side of the oil tank. Since the oil tank is not tightened from the longitudinal direction, the oil tank can be protected by suppressing damage and deformation of the oil tank.

  In the power unit and the cargo receiver lifting device of the present invention, only one side end member that seals one side opening on one side of the oil tank, and the other side end member that seals the other side opening on the other side of the oil tank. Since the oil tank is not tightened from the longitudinal direction, the oil tank can be protected by suppressing damage and deformation of the oil tank.

1 is an overall view of a cargo bed lifting device in an embodiment of the present invention. It is a whole rear view of the power unit. It is the figure which looked at the valve block from the drawer side end face. FIG. 3 is a rear view in which a part of FIG. 2 is enlarged. It is a top view of the power unit, (a) is an overall plan view of a state where the power unit is housed in a cross member, (b) is a plan view of a state where a part of the power unit is pulled out. It is YY sectional drawing in FIG. 2 of the oil tank. It is the figure which looked at the same power unit from the gate type cover side. It is the figure which looked at the pump of the power unit from the opposite side to the drawer side.

  Hereinafter, a power unit according to an embodiment of the present invention will be described. This power unit drives an actuator of a load receiving table lifting device mounted on a truck. In other words, the power unit is a hydraulic drive source for operating the cargo cradle provided in the truck. Prior to the description of the power unit, a schematic configuration of the truck and the receiving platform lifting device will be described.

  Referring to FIG. 1, a cargo box 1 having a cargo bed 3 on a vehicle body 2 is mounted on a truck 1. At the rear portion of the vehicle body 2, a load receiving platform lifting / lowering device 5 for loading and unloading loads on the loading platform 3 is disposed via an attachment frame 6 attached to the rear portion of the vehicle body 2. The load receiving table lifting device 5 includes a pair of left and right lifting frames 7 and a rectangular plate-shaped load receiving table 8. The load receiving table lifting device 5 further includes a pair of left and right parallel links 9. The parallel link 9 has a maximum ascending position (indicated by a one-dot chain line in FIG. 1) where the load receiving platform 8 is substantially at the same height as the upper surface of the load receiving platform 3 while the pair of left and right lifting frames 7 are kept in a fixed posture. It is possible to move up and down between the lowest position 8 (shown by a two-dot chain line in FIG. 1) in which 8 is grounded. A hollow reinforcing support member 10 for reinforcing the load receiving table 8 is fixed to the rear surface of the load receiving table 8 in a pair of left and right.

  The load receiving table lifting device 5 includes a lifting cylinder (lift cylinder) 11. The lifting cylinder 11 is an actuator for driving the lifting frame 7 to move up and down. The lifting cylinder 11 is arranged between each parallel link 9 and the mounting frame 6. A base frame 12 of a load receiving platform 8 is pivotally supported on each of the left and right lifting frames 7, and the load receiving platform 8 is placed at a standing storage position (shown by a solid line in FIG. 1) and substantially the same height as the upper surface of the loading platform 3. It can be rotated between a horizontal overhanging position (shown by a one-dot chain line in FIG. 1).

  The load receiving table lifting device 5 includes a hoisting cylinder (tilt cylinder) 13. The hoisting cylinder 13 is an actuator for hoisting the load receiving table 8. The hoisting cylinder 13 is disposed between a support bracket (not shown) fixed to the back surface of the load receiving platform 8 and the elevating frame 7. By extending the hoisting cylinder 13, the load receiving base 8 can be raised.

  The load receiving table lifting device 5 includes a cross member 14. The cross member 14 extends in the vehicle width direction, which is a direction orthogonal to the vehicle front-rear direction, as a longitudinal direction, and is disposed on the rear lower surface of the vehicle body 2. The cross member 14 includes a bottom wall 14A, a top wall 14B, and side walls 14C and 14D, and is formed in a hollow cross-sectional rectangular shape whose one end in the longitudinal direction is closed. A middle portion in the longitudinal direction of the top wall 14B of the cross member 14 is fixed (for example, welded) to the lower surface of the rear portion of the vehicle body 2. The other end in the longitudinal direction of the cross member 14 is an open insertion port 14E. Each mounting frame 6 is formed with an insertion opening 6a. The portions near the ends of the cross member 14 in the longitudinal direction are inserted into the insertion openings 6a. The portions near the ends of the cross member 14 in the longitudinal direction are inserted into the insertion openings 6a. The cross member 14 and each attachment frame 6 are fixed (for example, welded) in the inserted state.

  As shown in FIG. 2, the power unit 15 includes a power unit main body 16, a base 17 to which the power unit main body 16 is attached, a valve block 23, an oil tank 24, and a pump 25 that are a part of the configuration of the power unit main body 16. A holding member 18 to be held, a portal cover 19 that prevents interference between the cross member 14 and the power unit main body 16, a vibration isolating rubber 20 that protects the power unit main body 16 from vibration (see FIG. 3), an electrical wiring 21, and hydraulic pressure And a pipe 22.

  The power unit main body 16 can be pulled out in the longitudinal direction of the cross member 14 by a predetermined amount (as will be described later, the amount pulled out until the restriction bolt B4 contacts the holding bolt B1). Can be stored in the cross member 14. The power unit main body 16 includes the valve block 23, the oil tank 24, the pump 25, the electric motor 26, and the controller 27 in a row.

  In a state where the power unit main body 16 is housed in the cross member 14, the valve block 23, the oil tank 24, the pump 25, the electric motor 26, and the controller 27 are in this order in the insertion port 14 </ b> E side that is the drawing side end of the cross member 14. It arrange | positions on one line (straight line) so that it may follow a longitudinal direction toward an insertion side end. The pull-out side is the front side (left side in FIG. 2) C1 of the cross member 14 from which the power unit main body 16 is pulled out from the cross member 14, and the insertion side is the power unit main body 16 in the cross member 14 inserted into the cross member 14. The back side (the right side in FIG. 2) is defined as C2.

  The valve block 23 is a part that relays the flow of hydraulic oil between the oil tank 24 and the lifting cylinder 11 and the undulation cylinder 13 that are actuators. The valve block 23 includes a rectangular parallelepiped block main body portion 28 and a cylindrical block-side lid portion 29. The block main body 28 includes a needle valve for opening and closing the platform, a flow control valve for adjusting the descending speed of the load receiving platform 8, and a relief valve for adjusting the discharge pressure of the hydraulic oil. As shown in FIGS. 3 and 4, the block main body portion 28 has a drawing-side end surface (longitudinal end surface) 30 as one surface thereof, a needle valve adjusting portion 31 (two for opening and closing) as an adjusting portion, and a flow control valve. An adjustment unit 32, a relief valve adjustment unit 33, a solenoid SOLA for a descending solenoid valve, a solenoid SOLB for a undulation switching solenoid valve, and a pressure sensor 34 are provided. The solenoid SOLA and the solenoid SOLB are of a cartridge type (for example, constructed by assembling a spring, a spool, an O-ring, etc.), and are replaced when a failure occurs.

  As shown in FIG. 4, the block-side lid portion 29 is a part of the valve block 23, and thus is provided integrally with the block main body portion 28. The block-side lid portion 29 is fitted (internally fitted) to a valve-side small cross-sectional portion 35 of the oil tank 24, which will be described later, and also functions as a valve block 23 and a lid for the valve-side small cross-sectional portion 35. ing. The seal ring 36 is fitted on the outer peripheral surface of the block-side lid 29, and the sealing performance when the block-side lid 29 is fitted to the valve-side small cross-section 35 is ensured.

  A pipe connection portion is arranged on the other surface of the valve block 23, that is, the insertion side end surface 38 facing the oil tank 24 in the longitudinal direction and facing the one surface. The insertion side end surface 38 also includes the end surface of the block side lid portion 29. The insertion side end face 38 of the block main body 28 is in contact with the valve side small cross section 35.

  As shown in FIG. 5 (a), the pipe connecting portion is connected to the inlet piping 39 for connecting the inlet piping 39 for introducing the hydraulic oil from the pump 25 to the valve block 23, and from the valve block 23 to each actuator side. Derived pipe connecting portions 43 and 44 for connecting the derived pipes 41 and 42 for leading the hydraulic oil are provided.

  In this case, the introduction pipe 39 is an inner pipe inserted through the oil tank, and one end side and the other end side thereof are connected to the pump 25 and the valve block 23, respectively. The introduction pipe connecting portion 40 is an introduction side screw hole provided on the insertion side end face 38 of the valve block 23, and one end side of the introduction pipe 39 is connected to the introduction side screw hole 45 provided on the pump 25 side via an adapter 45a. The other end is connected to an introduction-side screw hole 40 provided on the end surface of the block-side lid 29 via an adapter 39a.

  The lead-out piping connection parts 43 and 44 are arranged at positions corresponding to the upper part of the insertion-side end face 38 that is removed from the oil tank 24 (above the valve-side small cross-sectional part 35 of the oil tank 24 described later). This is a lead-out side screw hole provided in the block 23. More specifically, the outlet pipe connecting portions 43 and 44 are disposed in the vicinity of the upper corner portion of the insertion side end surface 38 and in the vicinity of both ends in the width direction. One end side of the outlet pipe 41 is connected to one outlet side screw hole 43 provided on the insertion side end face 38 via an adapter 43a, and one end side of the outlet pipe 42 is the other outlet side provided on the insertion side end face 38. The screw hole 44 is connected via an adapter 44a.

  As shown in FIG. 3, groove-like recesses extending in the longitudinal direction are formed on both side surfaces in the width direction of the valve block 23. Specifically, the groove-shaped concave portion includes an upper concave portion 46 formed at a substantially central portion in the height direction on both side surfaces in the width direction, and a lower concave portion 47 formed below the upper concave portion 46. The height of the upper concave portion 46 is set higher than that of the lower concave portion 47. The lower recessed portion 47 is formed below the upper recessed portion 46 so as to be continuous with the upper recessed portion 46 and set to be deeper than the upper recessed portion 46. In other words, the upper concave portion 46 and the lower concave portion 47 are formed so as to be continuous vertically through the stepped surface 48 in the middle in the vertical direction.

  The oil tank 24 stores hydraulic oil supplied to the lifting and lowering cylinders 11 and 13. As shown in FIG. 2, the oil tank 24 includes a large cross section 49, the valve side small cross section 35, and a pump side small cross section 50. The large cross section 49, the valve side small cross section 35, and the pump side small cross section 50 are integrally formed of synthetic resin. The large cross section 49 is disposed in the middle in the longitudinal direction and is formed in the same cross sectional shape in the longitudinal direction. As shown in FIGS. 3 and 6, chamfers 51, 52, 53, and 54 are applied to the four corners of the large cross-section portion 49, so that the cross-sectional shape of the large cross-section portion 49 is formed in an octagonal cylindrical shape. ing. An oil supply port 55 (see FIG. 2), which is an oil pouring spout, is provided on the upper surface 49a of the large cross section 49, and the oil supply port 55 is closed by a cap 55a. A breather is provided.

  Outlet pipes 41 and 42 are arranged in the longitudinal direction of the cross member 14 along the upper chamfers 51 and 52 among the chamfers 51, 52, 53 and 54, respectively. Connected to the cylinder 13 side.

  The valve-side small cross-section portion 35 and the pump-side small cross-section portion 50 are formed to have a smaller cross section than the large cross-section portion 49 by being narrowed compared to the large cross-section portion 49. The valve side small cross section 35 is disposed on the valve block side with respect to the large cross section 49. The pump-side small cross section 50 is arranged on the pump side with respect to the large cross section 49.

  The cross-sectional shapes of the valve-side small cross-sectional portion 35 and the pump-side small cross-sectional portion 50 are substantially cylindrical shapes (circular cross section). The cylinder centers of the valve-side small cross-section portion 35 and the pump-side small cross-section portion 50 are displaced in the vertical direction, for example. Since the cylinder centers of the valve-side small cross-section portion 35 and the pump-side small cross-section portion 50 are displaced in the vertical direction, the rotation of the oil tank 24 is suppressed against the force in the direction in which the oil tank 24 is rotated. The

  As shown in FIG. 6, groove-shaped concave portions 56 are formed on both side surfaces in the width direction of the large cross-section portion 49 over the longitudinal direction. The groove-shaped recess 56 is formed to be concave toward the center in the width direction (inward in the radial direction) of the oil tank 24. The groove-shaped concave portion 56 is formed by the upper wall portion 57, the lower wall portion 58, and the back wall portion 59, and has the same cross section in the longitudinal direction. The groove-shaped recess 56 is not formed in the valve-side small cross-sectional portion 35 and the pump-side small cross-sectional portion 50. The groove-like recess 56 is located at a position corresponding to the positions of the upper recess 46 and the lower recess 47 of the valve block 23, and the depth position of the inner surface 59 a of the inner wall 59 is higher than that of the upper recess 46 of the valve block 23. It is set deeper than the back surface 47 a of the deep lower recess 47. Thus, a groove-shaped concave portion of the valve block 23, which will be described later, the oil tank 24, and the holding member 18 attached to the pump 25 in the longitudinal direction are prevented from interfering with the oil tank 24.

  The valve-side small cross-sectional portion 35 and the pump-side small cross-sectional portion 50 of the oil tank 24 have a substantially cylindrical shape and are open. Therefore, the valve-side small cross-sectional portion 35 is covered by the one side end member, and the pump-side small cross-sectional portion 50 is covered by the other side end member. One side end member corresponds to the valve block 23. The member that covers the valve side small cross-sectional portion 35 is the block side lid portion 29 as described above. The other side end member corresponds to the pump 25, which will be described later.

  The pump 25 sucks the hydraulic oil in the oil tank 24 and discharges the hydraulic oil to the introduction pipe 39 (valve block 23 side). As shown in FIG. 2, a gear pump is used for the pump 25. The pump 25 includes a rectangular parallelepiped pump body 60 and a cylindrical pump-side lid 61. The pump-side lid 61 is fitted (internally fitted) to the pump-side small cross-sectional portion 50 of the oil tank 24, and has a function of covering the pump-side small cross-sectional portion 50 together with the function of the pump 25. The seal ring 37 is fitted on the outer peripheral surface of the pump-side lid 61, and the sealing performance when the pump-side lid 61 is fitted to the pump-side small cross section 50 of the oil tank 24 is ensured. The drawing-side end surface 60 a of the pump main body 60 is in contact with the pump-side small cross-sectional portion 50.

  As shown in FIG. 8, groove-like recesses 25 a extending in the longitudinal direction are formed on both side surfaces of the pump 25 in the width direction. The groove-like recess 25a is at a position corresponding to the position of the lower recess 47 of the valve block 23, and the inner surface 25b of the groove-like recess 25a is flush with the inner surface 47a of the lower recess 47 of the valve block 23. Is set to

  In the groove-like recess of the valve block 23, the lower recess 47 is set to be deeper than the upper recess 46, and the inner surface 25b of the groove-like recess 25a of the pump 25 and the inner surface 47a of the lower recess 47 are flush with each other. However, the reason why the depths of the upper concave portion 46 and the lower concave portion 47 are changed in this way is to prevent the groove-shaped concave portion from interfering with the connecting portion of the electric motor 26 in the pump 25.

  The oil tank 24 is in a floating state with respect to the base 17, and as described above, the block-side lid portion 29 is fitted to the valve-side small cross-sectional portion 35, and the pump-side lid portion 61 is fitted to the oil tank 24. The oil tank 24 is temporarily held by the valve block 23 and the pump 25 by fitting to the pump side small cross section 50.

  The electric motor 26 is for driving the pump 25 and is disposed adjacent to the insertion side of the pump 25. The controller 27 controls the valve drive unit of the valve block 23 and the drive unit of the electric motor 26 and is disposed adjacent to the insertion side of the electric motor 26.

  A portal cover 19 is disposed near the insertion side of the controller 27. As shown in FIGS. 2 and 7, the portal cover 19 includes a pair of side wall parts 63 fixed to a side guard 62 of the base 17, which will be described later, and a top wall that connects both side wall parts 63 in the width direction at the upper end parts thereof. A wall 64. The side wall portion 63 extends in the vertical direction from the inner surface of the side guard 62 and is bent toward the center in the width direction at the upper portion thereof. The top wall portion 64 is arranged along the width direction. The height position of the top wall 64 is set higher than other members constituting the power unit main body 16. With such a structure of the portal cover 19, when the power unit 15 is pulled out in the longitudinal direction of the cross member 14, the power unit 15 can be prevented from interfering with the inner wall surface of the cross member 14, and the power unit 15 can be protected.

  As shown in FIGS. 3 and 6, the holding member 18 includes a hook-like portion 65, a cover portion 66, and a holding bolt B <b> 1. The holding members 18 are provided as a pair at least two apart from each other in the outer circumferential direction of the oil tank 24. In this case, the holding member 18 has a vertical plane (a plane passing through one end member and the other end member) P, which is a predetermined reference plane including the longitudinal direction of the valve block 23, the oil tank 24, and the pump 25. It is arranged separately on one side and the other side, and is configured to hold both the valve block 23 (one side end member) and the pump 25 (the other side end member) on one side and the other side of the reference plane. ing.

  The bowl-shaped portion 65 seals the valve side small cross-sectional portion 35 which is one side opening in the longitudinal direction of the oil tank 24 with the valve block 23, and the pump 25 small cross section which is the other side opening in the longitudinal direction with the pump 25. In a state in which the portion 50 is sealed, it has a length corresponding to at least the lengths of the valve block 23, the oil tank 24, and the pump 25 in the longitudinal direction. Specifically, the bowl-shaped portion 65 is formed to have a length substantially equal to the length in the longitudinal direction of the valve block 23, the oil tank 24, and the pump 25, and the groove-shaped recess of the valve block 23 and the oil tank 24. It is installed over.

  The hook-shaped portion 65 is a U-shaped portion having a U-shaped cross section orthogonal to the longitudinal direction. The U-shaped part is formed so as to protrude toward the center in the width direction (inner diameter direction of the oil tank 24). The U-shaped portion will be described with respect to the portion corresponding to the oil tank 24. As shown in FIG. A top wall side holding wall portion 67, a back wall side holding wall portion 68, and a bottom wall side holding wall portion 69 that respectively face the wall portion 58 are provided. By forming the bowl-shaped portion 65 with a U-shaped cross section, strength (rigidity) is improved and twisting is suppressed.

  There is a gap between the bowl-shaped portion 65 and the oil tank 24, and the bowl-shaped portion 65 and the oil tank 24 are not in contact with each other. This gap is configured so that the flange 65 and the oil tank 24 do not interfere with each other. In other words, the oil tank 24 is not damaged by the hook-shaped portion 65.

  The hook-like portion 65 will be described with respect to the portion corresponding to the valve block 23. The hook-like portion 65 is integrally provided with a side surface holding wall portion 70 that faces the side surface in the width direction of the valve block 23 at a position removed from the groove-like recess. Is provided. The side surface holding wall portion 70 is integrally formed so as to extend upward from the upper end of the U-shaped top wall side holding wall portion 67.

  The cover portion 66 is a portion that covers the electrical wiring 21 for supplying power for driving the power unit 15. The cover part 66 is formed integrally with the bottom wall side holding wall part 69 of the bowl-shaped part 65. The cover part 66 is formed at the open end of the U-shaped part. Specifically, the cover portion 66 is flush with the side surface holding wall portion 70 and covers the electric wiring 21 on the outer side in the width direction, and the groove-shaped recess 56 from the lower end of the outer covering wall portion 71. And a lower covering wall portion 72 that is bent so as to face the lower wall portion 58 and covers the electric wiring 21 on the lower side thereof.

  As shown in FIG. 2, the electrical wiring 21 connects the controller 21 and the electric motor 26, the wiring 21 </ b> B connecting the controller 27 and the valve block 23, and the controller 27 and the pressure sensor 34. Wiring 21C is provided. Among these, the wiring 21B and the wiring 21C are inserted into the groove-like recesses formed in the valve block 23, the oil tank 24, and the pump 25 in the middle of the wiring (see FIG. 6). That is, the wires 21 </ b> B and 21 </ b> C along the oil tank 24 are disposed in the gap between the bowl-shaped portion 65 and the oil tank 24. By forming the hook-shaped portion 65 in a U-shaped cross section, the strength (rigidity) is improved and the twist is suppressed, so that a situation where the hook-shaped portion 65 and the wires 21B and 21C strongly interfere with each other does not occur. I am doing so.

  The valve block 23 is provided with solenoids arranged in the middle of the hydraulic circuit connecting the oil tank 24 and the raising / lowering cylinder 11 and the oil tank 24 and the raising / lowering cylinder 13. Further, an emergency switch SW that is operated in an emergency (for example, an unexpected stop of the elevating cylinder 11) is disposed at a position away from the valve block 23. The wiring 21B includes a wiring having one end connected to the controller 27 and the other end connected to each solenoid, and a wiring having one end connected to the controller 27 and the other end connected to an emergency switch. The pressure sensor 34 is provided so as to protrude from the valve block 23 toward the drawing side, and one end of the wiring 21 </ b> C is connected to the controller 27 and the other end is connected to the pressure sensor 34.

  As described above, of the electrical wiring 21, the wiring 21 </ b> B and the wiring 21 </ b> C are inserted into the groove-shaped recesses in the middle of the wiring, and between the cover portion 66 and the outer surface along the longitudinal direction of the pump main body portion 60, the cover portion 66. And the outer surface along the longitudinal direction of the oil tank 24, and the cover portion 66 and the outer surface along the longitudinal direction of the block main body portion 28 are covered with the cover portion 66. The wiring 21B and the wiring 21C are accommodated in the groove-shaped recess in a state substantially parallel to the flange 65 (U-shaped portion).

  As shown in FIG. 3, the holding bolt B <b> 1 is disposed near the drawing side end and the insertion side end when the valve block 23, the oil tank 24, and the pump 25 are combined. That is, the holding bolt B1 is connected to the block main body portion 28, the pump main body from the rear wall holding wall portion 68 at a position corresponding to the block main body portion 28 of the valve block 23 in the rear wall holding wall portion 68 of the bowl-shaped portion 65. The portion 60 is screwed in the width direction. In other words, the holding bolt B <b> 1 is arranged so as to be opposed in a straight line from both sides of the holding bolt B <b> 1 through the vertical plane P, and goes toward the center of the valve block 23 and the pump 25, respectively. Further, the holding bolt B1 extends in the width direction from the rear wall side holding wall portion 68 to the pump main body portion 60 at a position corresponding to the pump main body portion 60 of the pump 25 in the rear wall side holding wall portion 68 of the bowl-shaped portion 65. It is screwed. Such holding bolts B <b> 1 are provided for the hook-like portions 65 on both sides, and are provided as a pair spaced apart in the longitudinal direction of the block main body 28 and the pump main body 60. Note that the holding bolt B <b> 1 does not penetrate the oil tank 24.

  Thus, the holding bolt B1 corresponds to the block main body portion 28 of the valve block 23 of the rear wall side holding wall portion 68 of the bowl-shaped portion 65 in a state where the valve block 23, the oil tank 24, and the pump 25 are combined. At the position corresponding to the pump main body 60 of the pump 25, the rear wall side holding wall 68 is screwed into the block main body 28 in the width direction. The rear wall side holding wall portion 68 is screwed into the pump main body portion 60 in the width direction. As a result, the oil tank 24 is securely held by the valve block 23 and the pump 25, and the oil tank 24, the valve block 23, and the pump 25 are held evenly.

  However, as described above, there is a gap between the hook-shaped portion 65 and the oil tank 24, and the hook-shaped portion 65 and the oil tank 24 are not in contact with each other. That is, the oil tank 24 is not directly held by the hook-like portion 65 and the holding bolt B1. However, the relative positions and relative postures of the valve block 23 and the pump 25 are held by the flange 65 and the holding bolt B1. For this reason, oil leakage due to the opening of both ends of the oil tank 24 can be prevented.

  In addition, since the cylinder centers of the valve side small cross section 35 and the pump side small cross section 50 are displaced in the vertical direction, the oil tank 24 is securely held by the valve block 23 and the pump 25. It has become. If the attitude of the oil tank 24 is ensured, for example, even if a force in the direction of rotating the oil tank 24 is applied to the oil tank 24 in accordance with the movement of the oil in the oil tank 24, the oil tank 24 can be used as the valve block 23 or the pump. It does not rotate relative to 25. For this reason, the oil supply port 55 does not face downward, and therefore oil can be prevented from leaking from the oil supply port 55. Further, since the holding bolt B1 is screwed to the block main body 28 and the pump main body 60 in a pair in the width direction, the block main body 28 and the pump main body 60 are inclined with respect to the oil tank 24. Can be prevented.

  By the way, in this embodiment, the cross-sectional shape of the valve-side small cross-section portion 35 and the pump-side small cross-section portion 50 is a cylindrical shape, and the block-side lid portion 29 and the pump-side lid portion 61 are connected to the valve-side small cross-section portion 35 and the pump-side small cross-section portion. The shape is fitted to the small cross section 50. Here, assuming that the sections of the valve-side small cross-section portion 35 and the pump-side small cross-section portion 50 are rectangular or elliptical, the pressure with the seal rings 36 and 37 is not uniform in such a shape. Therefore, in the present embodiment, the valve-side small cross-sectional portion 35 and the pump-side small cross-sectional portion 50 are formed in a cylindrical shape. 24 is assumed to rotate due to the movement of oil or the like. Thus, in the present embodiment, the oil tank 24 is prevented from rotating by shifting the cylindrical centers of the valve-side small cross-section portion 35 and the pump-side small cross-section portion 50.

  As shown in FIG. 3, the power unit main body 16 is fixed to the base 17 and can be handled collectively. That is, the power unit main body 16 can be pulled out and inserted (stored) in the longitudinal direction with respect to the cross member 14 together with the base 17. The longitudinal direction of the base 17 coincides with the longitudinal direction of the cross member 14.

  The base 17 includes a base main body 73, a vibration-proof rubber mounting portion 74, and the side guard 62. The base main body 73 is formed as a flat plate that follows the wall surface of the bottom wall 14A of the cross member 14, and is set to a length sufficient to mount the power unit main body 16.

  The anti-vibration rubber mounting portion 74 includes a one-side mounting plate portion 75 extended so as to incline upward from one end (front end) in the width direction of the base body portion 73 and the other end in the width direction of the base body portion 73 ( And the other-side mounting plate portion 76 that is extended so as to incline upward from the rear end). The side guards 62 extend upward from the one side mounting plate portion 75 and the other side mounting plate portion 76, respectively, and are formed in a plate shape set to the same length as the base main body portion 73. The one side attachment portion 75, the other side attachment portion 76, and the side guard 62 are formed by bending the end of the base body portion.

  The anti-vibration rubber 20 is formed in a substantially rectangular parallelepiped shape, and is placed on the upper surfaces of the one side mounting plate portion 75 and the other side mounting plate portion 76 via mounting members 77 that are respectively mounted along the inclination thereof. Yes. The mounting member 77 has a predetermined length in the longitudinal direction, and the anti-vibration rubber 20 is formed in a length corresponding to the longitudinal direction of the mounting member 77. In particular, the mounting member 77 is disposed in a position corresponding to the valve block 23, the pump 25, and the electric motor 26 in the power unit main body 16. The anti-vibration rubber 20 is placed at the center in the longitudinal direction of each placement member 77.

  The anti-vibration rubber 20 is fixed to the mounting member 77 from the outside of the mounting member 77 by an inner fixing bolt B2 inserted and screwed in a direction orthogonal to the inclination direction of the mounting member 77. The front end side of the inner fixing bolt B2 is screwed into the outer periphery of the valve block 23, the pump 25, and the electric motor 26. With this configuration, the valve block 23, the pump 25, and the electric motor 26 are mounted on the mounting member. 77 and the anti-vibration rubber 20 are integrated.

  The power unit main body 16 is fixed to the base 17 via a vibration isolating rubber 20 and a mounting member 77. In particular, in the power unit main body 16, regions corresponding to the valve block 23, the pump 25, and the electric motor 26 are fixed to the base 17 via the vibration isolating rubber 20 and the mounting member 77, so that the power unit main body 16 is 17 is fixed.

  Specifically, in the region of the one side mounting plate portion 75 and the other side mounting plate portion 76 where the mounting member 77 is disposed, the outer side fixing bolt B3 is connected to the one side mounting plate portion 75 and the other side mounting plate portion 76. The mounting member 77 is fixed to the base 17 by being inserted and screwed into the mounting member 77 in a direction orthogonal to the inclination direction from the outside. The outer fixing bolt B3 is arranged on both sides in the longitudinal direction with respect to the inner fixing bolt B2 in order to avoid the inner fixing bolt B2. With such a configuration, the power unit main body 16 is securely fixed to the base 17.

  Referring to FIG. 6, one side wall 14 </ b> C (or side wall 14 </ b> D) of cross member 14 has a regulation bolt B <b> 4 that regulates the amount of power unit 15 drawn from cross member 14 by contacting holding bolt B <b> 1. It is inserted. In this case, the holding bolt B <b> 1 is a bolt screwed into the pump main body 60 of the pump 25. The amount by which the power unit 15 is pulled out from the cross member 14, that is, the longitudinal position of the regulating bolt B4 is set so that at least the breather 55 of the oil tank 24 is exposed. That is, all the valve blocks 23 are exposed (see FIG. 5B).

  2, 5, and 7, reference numeral 78 denotes a lid. The lid 78 is a member that opens and closes the insertion port 14E of the cross member 14. The lid 78 is fixed to the end of the base 17 in the longitudinal direction. With the power unit main body 16 accommodated in the cross member 14, the insertion port 14E of the cross member 14 is closed, and the power unit main body 16 is pulled out from the cross member 14. In this state, the cross member 14 is separated from the insertion port 14E (the insertion port 14E is opened).

  In the power unit 15 configured as described above, the valve block 23 is disposed at the drawing-side end of the cross member 14. Therefore, as shown in FIG. 5B, when the power unit body 16 is pulled out in the longitudinal direction of the cross member 14 until the regulating bolt B4 comes into contact with the holding bolt B1 on the pump body 60 side, the needle valve adjustment is performed. Since the portion 31, the flow control valve adjustment portion 32, and the relief valve adjustment portion 33 are exposed from the cross member 14, these adjustments and maintenance are easy to perform.

  Further, the block main body portion 28 has a needle valve adjusting portion 31, a flow control valve adjusting portion 32, a relief valve adjusting portion 33, a solenoid SOLA for a descending solenoid valve, an undulation on a drawing side end surface (longitudinal end surface) 30 which is one surface thereof. A solenoid SOLB of the switching solenoid valve and the pressure sensor 34 are disposed, and the outlet pipe connecting portions 43 and 44 are disposed in the vicinity of the upper corner of the insertion side end surface 38 and in the vicinity of both ends in the width direction. That is, there are no outlet pipe connection parts 43 and 44 (outlet pipes 41 and 42) on the surface on which the needle valve adjustment part 31, the flow control valve adjustment part 32, the relief valve adjustment part 33 and the like are arranged. For this reason, when the power unit 15 is pulled out in the longitudinal direction of the cross member 14 and adjustment and maintenance are performed on the adjustment unit, adjustment and maintenance of the adjustment unit are further facilitated.

  Further, the needle valve adjustment unit 31, the flow control valve adjustment unit 32, the relief valve adjustment unit 33, and the like are disposed on the drawer side end surface 30 of the block main body 28. Therefore, when the power unit 15 is pulled out in the longitudinal direction of the cross member 14, it is possible to prevent the needle valve adjusting portion 31, the flow control valve adjusting portion 32, the relief valve adjusting portion 33 and the like from interfering with the cross member 14, and these adjusting portions. Can be protected.

  The lead-out pipes 41 and 42 are arranged in the longitudinal direction of the cross member 14 so as to be along the upper chamfers 51 and 52 among the chamfers 51, 52, 53 and 54 of the oil tank 24. 11 is connected to the undulation cylinder 13 side. As in this configuration, the lead-out pipes 41 and 42 are arranged along the longitudinal direction of the cross member 14 from the pipe connection part arranged at the upper part of the insertion-side end face of the block main body part 28, thereby preventing the oil tank 24. The lead-out pipes 41 and 42 can be connected to the lead-out pipe connecting portions 43 and 44 without being connected, and the lead-out pipes 41 and 42 led out from the upper part of the insertion side end face of the valve block 23 are used as they are. By making it go to the side, the outlet pipes 41 and 42 can be easily routed, and the outlet pipes 41 and 42 can be easily maintained from above.

  Furthermore, by placing the outlet pipes 41 and 42 in the space between the cross member 14 and the chamfers 51 and 52, the outlet pipes 41 and 42 are not damaged when the power unit 15 is taken in and out of the cross member 14.

  The present invention can be variously modified without departing from the spirit of the present invention. In addition, the specific configuration of each part is not limited to the above embodiment. For example, in the above-described embodiment, the one side on which the adjustment unit is disposed is used as the extraction side end surface 30 of the valve block 23, and the introduction pipe connection unit 40 and the lead-out pipe connection units 43 and 44 are the insertion side end surface 38, which is other than the one side. The example arranged in the above has been described.

  However, when the power unit 15 is pulled out from the cross member 14, the adjustment unit may be disposed on the top surface 23a or the side surface 23b of the valve block 23 as long as the adjustment unit is on a surface that can be easily adjusted and maintained. In any case, the introduction pipe connection portion 40 and the lead-out pipe connection portions 43 and 44 are provided on a surface other than the surface on which the adjustment portion is disposed, and the lead-in piping 39 is connected to the lead-in pipe connection portion 40 to connect the lead-out pipe connection. By connecting the outlet pipes 41 and 42 to the parts 43 and 44, the adjustment part can be easily adjusted and maintained. In the above embodiment, the adjustment unit is the needle valve adjustment unit 31, the flow control valve adjustment unit 32, and the relief valve adjustment unit 33, but is not limited thereto.

  In the above embodiment, the chamfers 51, 52, 53, 54 are formed at the four corners of the oil tank 24, and the outlet pipes 41, 42 are arranged along the upper chamfers 51, 52, respectively, in the longitudinal direction of the cross member 14. did. However, when the power unit 15 is taken in and out of the cross member 14, in order not to damage the outlet pipes 41 and 42 and to prevent the outlet pipes 41 and 42 from getting in the way, a recess in place of the chamfers 51 and 52 is provided. It is also conceivable that, in the upper surface of the large cross section 49 of the oil tank 24, for example, it is formed at the center in the width direction and the outlet pipes 41, 42 are accommodated in this recess.

  And such a recessed part is not limited to arrange | positioning in the upper part of the oil tank 24 large cross-section part 49, It can also form in the height direction of the large cross-section part 49, and can also be formed in the lower part, Or depending on the case, it is also possible to expand and use the groove-shaped recessed part which accommodated the electrical wiring 21. FIG.

  In the above embodiment, two lead pipe connecting portions 43 and 44 are provided, and the lead pipes 41 and 42 connected to the lead pipe connecting parts 43 and 44 are connected to the lifting cylinder 11 and the undulating cylinder 13, respectively. However, the number of lead-out piping connection portions 43 and 44 is not limited to two, and in a vehicle including the lifting cylinder 11, the hoisting cylinder 13, and other actuators, a plurality may be provided according to the number of the actuators. On the contrary, depending on the configuration of the vehicle, in the case where the raising and lowering cylinder 13 is not provided as the load receiving platform elevating device 5 and the actuator is provided with only the elevating cylinder 11, the outlet piping connecting portion and the outlet piping are for the lifting cylinder 11. It becomes one.

  In the above-described embodiment, the power unit main body 16 includes the valve block 23, the oil tank 24, the pump 25, the electric motor 26, and the controller 27 in the state in which the cross member 14 is housed. An example is shown in which it is arranged on a straight line so as to extend along the longitudinal direction from the end toward the insertion side end. However, if the introduction pipe connection portion 40 and the lead-out piping connection portions 43 and 44 are provided on a surface other than the surface where the adjustment portion is disposed and adjustment and maintenance are easy, the valve block 23, the oil tank 24, and the pump 25 are provided. The arrangement order of the electric motor 26 and the controller 27 is not particularly limited.

  In the above-described embodiment, the holding bolt B <b> 1 is connected to the block main body 28 from the rear wall holding wall 68 at a position corresponding to the block main body 28 of the valve block 23 of the rear wall holding wall 68 of the bowl-shaped portion 65. Shows the case of screwing in the width direction. However, the oil tank 24 holds only one end member that seals one side opening of the oil tank 24 and the other end member that seals the other opening of the other side of the oil tank 24. Is not tightened from the longitudinal direction, for example, the flange 65 extends in the longitudinal direction of the cross member 14, and is bent on one surface of the valve block 23 and the pump 25, so that the holding bolt B1 extends along the longitudinal direction. The oil tank 24 may be screwed. Further, it is possible to drive the pin into the valve block 23 and the pump 25 using a pin instead of a bolt.

  In the above embodiment, a vertical plane P including the longitudinal direction of the valve block 23, the oil tank 24, and the pump 25 is assumed as a surface passing through the one side end member and the other side end member, and the holding members 18 are provided on both sides of the vertical plane P. Were distributed to symmetrical positions. However, the plane passing through the one side end member and the other side end member is not limited to the vertical plane P, and may be a plane inclined with respect to the vertical plane P, or in some cases a horizontal plane. Also good. Moreover, the holding member 18 can also be provided in an asymmetrical position with respect to the surface passing through the one side end member and the other side end member.

  It is also possible to provide three or more hook-shaped portions 65 and fix each hook-shaped portion 65 to the valve block 23 and the pump 25 using the holding bolt B1. In this case, it is preferable that the hook-like portions 65 are arranged at equal intervals in the circumferential direction of the valve block 23 and the pump 25 in terms of stable holding.

  In the above embodiment, the one end member is the valve block 23, the other end member is the pump 25, a part of the valve block 23 and a part of the pump 25 are used as the lid of the oil tank 24. However, it is also possible to use a specially provided member as the lid of the oil tank 24 separately from the valve block 23 and the pump 25. Alternatively, as the lid of the oil tank 24, it is possible to use a member specially provided only for one of the valve block 23 and the pump 25.

  In the above embodiment, the bowl-shaped portion 65 has a U-shaped cross section, but is not particularly limited to a U-shaped cross section as long as it has a cross-sectional shape that can improve strength (rigidity), for example, a W-shaped cross section. Also good. In the above-described embodiment, the cylinder centers of the valve-side small cross-sectional portion 35 and the pump-side small cross-sectional portion 50 are shown as being displaced in the vertical direction, but the direction of the positional deviation is not limited to the vertical direction. The left and right direction may be used.

  DESCRIPTION OF SYMBOLS 1 ... Lorry car, 5 ... Loading platform raising / lowering device, 8 ... Loading platform, 11 ... Lifting cylinder, 13 ... Lifting cylinder, 14 ... Cross member, 15 ... Power unit, 16 ... Power unit main body, 21 ... Electric wiring, 22 ... Hydraulic piping, 23 ... Valve block, 24 ... Oil tank, 25 ... Pump, 26 ... Electric motor, 27 ... Controller, 28 ... Block main body, 30 ... Drawer side end face, 31 ... Needle valve adjustment unit, 32 ... Flow control valve adjustment , 33 ... relief valve adjusting part, 34 ... pressure sensor, 38 ... insertion side end surface, 39 ... introduction pipe, 40 ... introduction pipe connection part, 41, 42 ... lead-out pipe, 43, 44 ... lead pipe connection part, 60 ... Pump body, 65 ... bowl, SW ... emergency switch

Claims (7)

A power unit that is a hydraulic drive source for operating a load receiving stand provided in a vehicle in a state of being housed in a cross member provided in the vehicle,
An oil tank for storing hydraulic oil supplied to the actuator for operating the cargo cradle;
One side end member that seals one side opening of one side of the oil tank in the longitudinal direction of the cross member;
The other side end member for sealing the other side opening of the other side of the oil tank in the longitudinal direction of the cross member;
In a state where the one side end member seals the one side opening of the oil tank and the other side end member seals the other side opening, the at least one side end member, the oil tank, and the other side end member in the longitudinal direction A holding member having a length corresponding to the length,
The holding member is arranged separately on one side and the other side with respect to the surface passing through the one side end member and the other side end member, and the one side end member and the other side end member are arranged as one side end member and the other side. A power unit that is held on one side and the other side of a surface that passes through an end member.   The power unit according to claim 1, wherein the holding member includes a U-shaped portion having a U-shaped cross section perpendicular to the longitudinal direction. The U-shaped part is formed so as to protrude in the radial direction of the oil tank,
The power unit according to claim 2, wherein a recess for accommodating the U-shaped portion is formed on at least an outer peripheral surface along the longitudinal direction of the oil tank among the oil tank, the one side end member, and the other side end member.   The holding member includes a cover portion that covers an electric wiring for supplying electric power for driving the power unit, and the electric wiring is disposed between the cover portion and the outer peripheral surface along the longitudinal direction of the oil tank. The power unit according to claim 3. The cover part is extended from the open side end part in the U-shaped part,
The recess is wider than the U-shaped part,
The power unit for selecting the power unit according to claim 4, wherein the electrical wiring is housed in the recess in a state substantially parallel to the U-shaped part.   The oil tank is provided with an oil supply port, the one side opening and the other side opening of the oil tank are circular in cross section, and the one side opening and the center of the other side opening are displaced from each other. The power unit according to any one of 5.   The power receiving unit ascending and descending, wherein the power unit according to any one of claims 1 to 6 can be pulled out along a longitudinal direction along the vehicle width direction to a cross member extending in the vehicle width direction. apparatus.

Images