JP5490483B2 - Loading platform lifting device - Google Patents

Description

  The present invention relates to a load receiving table lifting device provided at a rear portion of a load carrier of a vehicle. In particular, the present invention relates to a load receiving table lifting device that lifts and lowers a load receiving table by a hydraulic cylinder disposed in a cross member.

  Conventionally, as this kind of load receiving platform lifting device, there is known a device in which a slider is inserted into a post that is erected on both sides of the rear end of a vehicle loading platform, and the load receiving platform is supported by these sliders. (For example, refer to Patent Document 1). In this load receiving device lifting apparatus, a hydraulic cylinder is disposed in a cross member connected between posts, and the slider is moved up and down through the wire by the expansion and contraction operation of the hydraulic cylinder, and the load receiving table is moved up and down.

  Specifically, as shown in FIG. 16, the load receiving platform lifting device of Patent Document 1 includes a pair of posts 2 erected on both sides of the rear end of the vehicle loading platform 1, and is slidable within each post 2. A slider 4 inserted in a freely movable manner via a sub-post 3 inserted in the head, a tailgate 5 as a load receiving base supported rotatably by the left and right sliders 4, and one end of the other end in the cross member 22 Is attached to each slider 4, a hydraulic cylinder 6 having a movable pulley (not shown) around which the wire 9 is wound at the rod end, and a hydraulic power unit P that supplies pressure oil to the hydraulic cylinder 6. It has.

  In this load receiving device lifting device, when the rod of the hydraulic cylinder 6 is contracted, the wire 9 in the cross member 22 is drawn into the post 2 and the slider 4 is lowered, and the sub post 3 and the tailgate 5 are lowered at the same time. . On the contrary, when the rod of the hydraulic cylinder 6 is extended, the wire 9 in the post 2 is attracted into the cross member 22 and the slider 4 is raised, and the sub post 3 and the tailgate 5 are raised.

  By the way, in the above-described load receiving platform elevating device, the hydraulic power unit P is mounted below the left rear portion of the vehicle loading platform 1, but when the hydraulic power unit is mounted on the vehicle in this way, a part of the loading platform 1 is cut off. In addition, it is necessary to make cans of brackets for hydraulic power units, and much time and labor must be spent on the bodywork.

  Accordingly, the inventor of the present application has devised that the hydraulic power unit is installed in the cross member together with the hydraulic cylinder in order to reduce the installation time and installation effort of the hydraulic power unit.

JP 2005-313750 A

  However, when repairing or maintaining the hydraulic power unit, it is easier to work if the hydraulic power unit is installed under the loading platform of the vehicle, whereas the hydraulic power unit is installed in the cross member. In such a case, it is necessary to take out the hydraulic power unit from the cross member before starting maintenance or the like, and return the hydraulic power unit to the cross member after completing maintenance or the like. For this reason, although the mounting time and the mounting labor of the hydraulic power unit are reduced, a lot of time and labor must be spent for the maintenance of the hydraulic power unit and the like.

  The present invention was devised in view of such problems, and a load receiving table lifting device capable of reducing time and labor spent for maintenance of the hydraulic power unit even when the hydraulic power unit is installed in the cross member. The purpose is to provide.

  As means for solving the above-described problems, the load receiving table lifting apparatus of the present invention is configured as follows.

The load receiving platform lifting apparatus according to the present invention includes a post erected on each side of a rear end of a vehicle loading platform, a slider provided so as to be able to move up and down along the post, a load receiving platform supported by the slider, A hydraulic cylinder is provided in a cross member installed between the posts and moves the slider up and down via a wire, and a hydraulic power unit that supplies pressure oil to the hydraulic cylinder. The hydraulic power unit includes an electric motor, a hydraulic oil tank and a hydraulic pump fixed integrally with each other, and valves provided separately from these components, and is installed in the cross member. The valves are connected to be able to communicate with the hydraulic cylinder via a flexible tube for a cylinder, and are connected to be able to communicate with the hydraulic oil tank and the hydraulic pump via a flexible tube in the unit . The valves are provided separately from the electric motor, the hydraulic oil tank, and the hydraulic pump through the in-unit flexible tube .

  According to the load receiving platform lifting apparatus having such a configuration, since the valves are provided separately from the electric motor, the hydraulic oil tank, and the hydraulic pump, the electric motor, the hydraulic oil tank, and the hydraulic pump are installed in the cross member. In this state, the valves can be taken out of the cross member and repaired, maintained, or the like. In addition, since the valves are connected to the hydraulic cylinder, the hydraulic oil tank, and the hydraulic pump through the flexible tube, the valves can be taken out from the cross member without the need for disassembling the piping. it can.

  Further, the valves of the hydraulic power unit are fixed in the cross member exclusively by a valve fixing fixture that fixes the valves in the cross member, and the fixing by the valve fixing fixture is released. Therefore, it is desirable that it is provided so as to be removable from the cross member.

  According to the load receiving device lifting apparatus having such a configuration, since the valves are fixed in the cross member by a dedicated fixture for valves, the components of the hydraulic power unit other than the valves are fixed in the cross member. Only valves can be taken out from the cross member.

In addition, it is desirable that the valves dedicated fixing tool is fixed or released by inserting and removing in the vehicle front-rear direction .

  According to the load receiving platform lifting apparatus according to the present invention, the valves are taken out from the cross member without disassembling the piping while the electric motor, the hydraulic oil tank, and the hydraulic pump are installed in the cross member of the hydraulic power unit. be able to. Since the frequency of repairs, maintenance, etc. is relatively high, if only the valves can be taken out of the cross member in this way, the entire hydraulic power unit is taken out of the cross member for maintenance, etc. Thus, the time and labor spent for maintenance and the like are reduced.

It is the perspective view which looked at the load receiving platform raising / lowering device which concerns on embodiment of this invention from the left rear of a vehicle. It is the figure which looked at the various apparatus provided in the said cross member and a cross member in the state which removed the cover plate which forms the rear surface of a cross member. It is the top view which looked at the various equipment provided in the cross member from the top. Cross members, posts, etc. are indicated by imaginary lines. FIG. 3 is an enlarged view of the hydraulic power unit in FIG. 2. It is an enlarged view of the hydraulic power unit in FIG. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG. It is CC sectional drawing of FIG. It is DD sectional drawing of FIG. It is EE sectional drawing of FIG. It is a hydraulic circuit diagram of the load receiving table elevating device according to the embodiment of the present invention. It is a figure for demonstrating the procedure at the time of installing a hydraulic power unit in a cross member, and is the figure seen from the same position as FIG. It is a figure for demonstrating the procedure at the time of installing a hydraulic power unit in a cross member, and is the figure seen from the same position as FIG. It is a figure for demonstrating the procedure at the time of installing a hydraulic power unit in a cross member, and the figure seen from the same position as FIG. It is a figure for demonstrating the procedure at the time of taking out a valve block from the inside of a cross member. It is the perspective view which looked at the load receiving table raising / lowering device which concerns on a prior art example from the left rear of a vehicle.

  Hereinafter, a load receiving table lifting apparatus according to an embodiment of the present invention will be described with reference to the drawings.

  As shown in FIGS. 1 to 3, the load receiving platform lifting apparatus according to the embodiment of the present invention includes a post 2, a sub post 3, a slider 4, a tail gate 5, a hydraulic cylinder 6, pulleys 81 to 85, a wire 9, and hydraulic pressure. A power unit 10 and the like are provided.

  The posts 2 are erected on both sides of the rear end of the loading platform 1 of the vehicle, and sub-posts 3 are slidably inserted into the posts 2.

  A part of the slider 4 is slidably inserted into the sub post 3, and is provided so as to move up and down along the post 2 via the sub post 3.

  The tailgate 5 is rotatably supported by the left and right sliders 4 and 4. The tailgate 5 is a load receiving platform for receiving a load, and is raised and lowered between the ground and the loading platform 1.

  The hydraulic cylinder 6 is installed in the cross member 7, and a moving pulley 81 having two rows is provided at the tip of the rod of the hydraulic cylinder 6 as shown in FIG. Two wires 9A and 9B are wound around each row of the movable pulley 81, respectively. One wire 9A is fixed to a fixing portion 72 fixed to the top surface 71 of the cross member 7, as shown in FIG. As shown in FIG. 3, the moving pulley 81, the fixed pulley 82 provided at the left end of the cross member 7, and the fixed pulley 83 (see FIG. 1) provided at the upper portion of the left post 2 are sequentially passed from the fixed portion 72. The other end of the left slider 4 is fixed.

  As shown in FIG. 6, one end of the other wire 9B is fixed to a fixing portion 74 fixed to the floor surface 73 in the cross member 7, and as shown in FIG. The right slider 4 passes through a moving pulley 81, a fixed pulley 82, a fixed pulley 84 provided at the right end of the cross member 7, and a fixed pulley 85 (see FIG. 1) provided at the upper portion of the right post 2 in order from 74. The other end is fastened to.

  When the rod of the hydraulic cylinder 6 is extended, the wires 9A and 9B in the post 2 are drawn into the cross member 7, the slider 4 is raised, and the sub post 3 and the tailgate 5 are also raised at the same time. On the other hand, when the rod of the hydraulic cylinder 6 contracts, the wires 9A and 9B in the cross member 7 are fed into the post 2 and the slider 4 is lowered, and at the same time, the sub post 3 and the tail gate 5 are also lowered.

  Hereinafter, the hydraulic power unit 10 will be described in detail. In the load receiving table lifting apparatus according to the embodiment of the present invention, the hydraulic power unit 10 is provided in the cross member 7 together with the hydraulic cylinder 6.

  The hydraulic power unit 10 is provided behind the hydraulic cylinder 6 in the cross member 7, and includes an electric motor 11, a hydraulic oil tank 12, a hydraulic pump 13, an adapter 14, a valve block 15 and the like as shown in FIGS. It is configured.

  The electric motor 11 is fixed to the left side surface of the adapter 14 with a bolt 143. The output shaft of the electric motor 11 passes through the adapter 14 and is connected to the input shaft of the hydraulic pump 13.

  Further, as shown in FIG. 6, the opposite output shaft side of the electric motor 11 is supported on the floor surface 73 in the cross member 7 by the motor support portion 18. As shown in FIGS. 4 and 6, the motor support portion 18 includes a sub base plate 19, a motor bracket 181, a vibration isolating rubber 182, bolts 184, and the like. The sub-base plate 19 includes a base plate 191 fixed with bolts 183 along the floor surface 73 in the cross member 7, and both sides of the base plate 191 at a position higher than the base plate 191 through steps. It is composed of a pair of extending mounting plates 192 and 192. The motor bracket 181 is fixed on the opposite side of the output shaft of the electric motor 11. The anti-vibration rubber 182 is interposed between the motor bracket 181 and the sub base plate 19 (mounting plate 192) and fastened by bolts 184. The anti-vibration rubber 182 attenuates vibration transmitted from the electric motor 11 via the motor bracket 181.

  The motor bracket 181 is attached with a terminal portion 20 having two terminals. One terminal 201 of the terminal portion 20 is connected to a battery (not shown), and the other terminal 202 is connected to the electric motor 11.

  As shown in FIG. 4, the hydraulic oil tank 12 is fixed to the right side surface of the adapter 14 with a bolt 143. The hydraulic oil supplied to the hydraulic cylinder 6 is stored in the hydraulic oil tank 12.

  The hydraulic pump 13 is fixed to the right side surface of the adapter 14 with a bolt in the hydraulic oil tank 12. A suction filter 131 is attached to the suction side of the hydraulic pump 13, and the hydraulic oil in the hydraulic oil tank 12 is sucked into the hydraulic pump 13 through the suction filter 131.

  The electric motor 11, the hydraulic oil tank 12, and the hydraulic pump 13 are fixed integrally with each other via an adapter 14. As shown in FIG. 5, a first tube connection portion 141 and a second tube connection portion 142 are attached to the adapter 14. The first tube connecting portion 141 communicates with the discharge port of the hydraulic pump 13 through a discharge side oil passage (not shown) formed in the adapter 14. The second tube connection portion 142 communicates with the hydraulic oil tank 12 through a tank-side oil passage (not shown) formed in the adapter 14.

  The valve block 15 is provided separately from the constituent elements 11 to 14 of the hydraulic power unit 10. The valve block 15 includes valves related to the operation of the hydraulic cylinder 6. For example, as shown in FIGS. 4 and 5 and a piping diagram (FIG. 11), a valve block main body 151 in which an oil passage is formed. And a solenoid valve 152, a flow control valve 153, a check valve 157, a relief valve 158 and the like provided in the valve block main body 151. The said valve block main body 151 is comprised by what formed the oil path in metal blocks, such as aluminum die-casting.

  Further, as shown in FIGS. 3 and 5, a third tube connecting portion 154, a fourth tube connecting portion 155, and a fifth tube connecting portion 156 are attached to the valve block main body 151. The third tube connection portion 154 is connected to the first tube connection portion 141 of the adapter 14 via the flexible tube 17A. The fourth tube connection portion 155 is connected to the second tube connection portion 142 of the adapter 14 via the flexible tube 17B. Further, the fifth tube connection portion 156 is connected to the hydraulic cylinder 6 via the flexible tube 17C. That is, the valve block (valves) 15 is connected to the hydraulic cylinder 6, the hydraulic oil tank 12, and the hydraulic pump 13 through the flexible tubes 17A to 17C.

  As shown in FIG. 2, the hydraulic power unit 10 is fixed on a floor surface 73 in the cross member 7 via a base plate 16.

  One end of the base plate 16 is bolted along the floor surface 73 in the cross member 7 as shown in FIG. 7 which is a BB sectional view of FIG. 2 and FIG. 8 which is a CC sectional view of FIG. A base plate 161 fixed at 164, and a pair of adapter mounting plates 163 and 163 extending from both sides of the base plate 161 to both sides at a position above the base plate 161 through a step. Yes. Then, the adapter mounting plates 163 and 163 are mounted with the leg portions 145 of the adapter 14 via the anti-vibration rubber 146, and the adapter mounting plates 163 and 163 of the base plate 16 and the leg portions 145 are fastened by bolts 147 or the like. ing.

  As shown in FIG. 9, which is a DD cross-sectional view of FIG. 2, the intermediate portion of the base plate 16 is composed of the base plate 161 described above and the flanges 162 that rise upward from both sides of the base plate 161. ing.

  The other end side of the base plate 16 is formed on the base plate 161 described above and the vehicle rear side (left side in the drawing) of the base plate 161 as shown in FIG. 10 which is an EE cross-sectional view of FIG. And a valve block mounting plate 165 that rises largely upward from the vehicle front side (right side in the figure) of the base plate 161.

  A valve block main body 151 is fixed to the valve block mounting plate 165 with the back surface 151a thereof aligned. Specifically, the valve block main body 151 is formed with two through holes penetrating in the vehicle front-rear direction (left-right direction in the figure), and the valve block mounting plate 165 is also formed with a through hole at a position corresponding to the through hole. ing. A nut 166 is welded to the through hole of the valve block mounting plate 165. A hexagon socket head cap screw 167 is inserted into the through hole formed in the valve block main body 151 and the valve block mounting plate 165 and screwed into the nut 166.

  By the way, the flexible tube 17C described above for connecting the hydraulic cylinder 6 and the valve block 15 is formed in the adapter 14 so as not to hinder the expansion and contraction operation of the rod of the hydraulic cylinder 6 and the movement operation of the wires 9A and 9B. The tube holding portion 144 and the tube holding members 21 and 21 fixed in the cross member 7 on both sides of the tube holding portion 144 are held.

  For example, as shown in FIG. 7, the tube holding portion 144 includes a groove portion having a substantially C-shaped cross section formed so that the flexible tube 17 </ b> C can be fitted therein. The tube holding portion 144 has a groove entrance width smaller than the outer diameter of the flexible tube 17C so that the fitted flexible tube 17C does not easily fall off. The tube holding portion 144 shown in FIG. 7 is open to the back side (left side in the figure) in the cross member 7, but the upper side (upper side in the figure), the front side in the cross member 7 (right side in the figure). It may be one opened to the top.

  For example, as shown in FIGS. 6 and 10, the tube holding member 21 has a structure in which the flexible tube 17 </ b> C can be attached and detached from the rear of the vehicle. Specifically, the tube holding member 21 includes a ceiling plate 211 welded along the top surface 71 of the cross member 7 and a tube support horizontally extending from the ceiling plate 211 to the vehicle rear side through a step. A plate 212, and an intermediate plate 213 that connects the ceiling plate 211 and the tube support plate 212 up and down. The distance between the tube support plate 212 and the top surface 71 of the cross member 7 is approximately the same as the outer diameter of the flexible tube 17C.

  In the load receiving table lifting apparatus configured as described above, the electric motor 11 and the hydraulic pump 13 are driven, and the solenoid valve 152 is set to the shut-off position 152a (see FIG. 11), so that the hydraulic oil in the hydraulic oil tank 12 can be obtained. Is sucked into the hydraulic pump 13 and supplied from the hydraulic pump 13 to the first oil passage 159a (see FIG. 11) in the valve block 15 through the flexible tube 17A. Then, the pressure oil supplied to the first oil passage 159a opens the check valve 157, and is supplied to the head side of the hydraulic cylinder 6 through the flexible tube 17C.

  As a result, the rod of the hydraulic cylinder 6 is extended, the wires 9A and 9B in the left and right posts 2 and 2 are drawn into the cross member 7, and the slider 4, the sub post 3 and the tailgate 5 are raised.

  On the other hand, when the drive of the electric motor 11 and the hydraulic pump 13 is stopped and the solenoid valve 152 is set to the communication position 152b (see FIG. 11), the head side of the hydraulic cylinder 6 and the hydraulic oil tank 12 communicate with each other. The hydraulic oil on the head side can return to the hydraulic oil tank 12. As a result, the rod of the hydraulic cylinder 6 is contracted by a load such as the tailgate 5 and a load, and the wires 9A and 9B in the cross member 7 are fed out into the left and right posts 2 and 2, and the slider 4, sub-post 3 and The tailgate 5 is lowered. Note that a flow control valve denoted by reference numeral 153 is provided to control the descending speed of the tailgate.

  Hereinafter, a procedure for mounting the hydraulic power unit 10 in the cross member 7 will be described. Prior to mounting the hydraulic power unit 10 in the cross member 7, mounting of the hydraulic cylinder 6, pulleys 81, 82, 84, wires 9 </ b> A, 9 </ b> B, etc. is completed in the cross member 7. Shall.

  First, outside the cross member 7, the base plate 16 and the sub base plate 19 are attached to the hydraulic power unit 10 in advance using bolts 147, 167, 184 and the like. Further, the hydraulic cylinder 6 and the fifth tube connecting portion 156 of the valve block 15 are connected by the flexible tube 17C, and the intermediate portion of the flexible tube 17C is fitted into the tube holding portion 144 of the adapter 14.

  Next, as shown in FIGS. 12 and 14, the flexible tube 17 </ b> C is held (hanged) by the tube holding members 21 and 21 provided on the top surface 71 in the cross member 7, respectively. The entire hydraulic power unit 10 is inserted into the cross member 7 and arranged behind the hydraulic cylinder 6.

  At this time, as shown in FIG. 13, since the intermediate portion of the flexible tube 17C is held by the tube holding portion 144 of the adapter 14, the flexible tube 17C is held (latched) on the tube holding members 21 and 21. ) Work becomes easier.

  After the hydraulic power unit 10 is arranged in the cross member 7, the base plate 16 and the sub base plate 19 and the floor surface 73 in the cross member 7 are fixed with bolts 164, 183 and the like. Then, the upper part of the cover plate 7a is inserted into the insertion port of the main body of the cross member 7, and the lower part of the cover plate 7a is attached to the main body side of the cross member 7 with a bolt 74 or the like. Thereby, the installation of the hydraulic power unit 10 in the cross member 7 is completed.

  In the load receiving table lifting device described above, the valve block 15 is fixed to the base plate 16 by a hexagon socket head cap screw 167 (a dedicated fixture for valves) for fixing only the valve block 15 to the base plate 16 (valve block mounting plate 165). It is fixed to. For this reason, as shown in FIG. 15A, the electric motor 11, the hydraulic oil tank 12, the hydraulic pump 13, and the adapter can be obtained simply by removing the hexagon socket head bolt 167 (releasing the fixing with the hexagon socket head bolt 167). The valve block 15 can be taken out from the cross member 7 while 14 is installed in the cross member 7.

  The hexagon socket head cap bolt 167 is disposed at a position and an orientation in which a tool can be engaged from the opening side of the cross member 7. That is, the tool engaging portion formed on the head of the hexagon socket head cap bolt 167 faces the opening of the cross member 7.

  Further, since the valve block 15 is connected to the hydraulic cylinder 6, the hydraulic oil tank 12, and the hydraulic pump 13 through the flexible tubes 17A to 17C, as shown in FIG. The valve block 15 can be taken out from the cross member 7 without requiring the work of disassembling the piping.

  When the valve block 15 is installed in the cross member 7 again, the valve block 15 is fixed to the base plate 16 (valve block mounting plate 165) with hexagon socket bolts 167 in the reverse procedure.

  As is clear from the above description, according to the load receiving table lifting apparatus according to the embodiment of the present invention, only the valve block 15 of the hydraulic power unit 10 can be easily taken out from the cross member 7 and removed. The valve block 15 can be easily installed in the original place. As a result, the time and labor required for the maintenance of the valve block 15 having a relatively high maintenance frequency are reduced, and the time required for the maintenance of the hydraulic power unit 10 as a whole is reduced. Labor is reduced.

  In addition, since there is an empty space below the left rear portion of the loading platform 1 where the power unit is conventionally installed, equipment and parts (for example, a footrest, a chain hook, etc.) can be attached to this space.

  In the embodiment described above, the electric motor 11, the hydraulic oil tank 12, and the hydraulic pump 13 are integrally fixed to each other via the adapter 15, but the electric motor 11, the hydraulic oil tank 12, and the hydraulic pump 13 are fixed. Can be directly fixed to each other without using an adapter.

  In the embodiment described above, only the adapter 14 is fixed to the base plate 16 among the electric motor 11, the hydraulic oil tank 12, the hydraulic pump 13, and the adapter 14 that are fixed integrally with each other. Any one or more of the electric motor 11, the hydraulic oil tank 12, the hydraulic pump 13, and the adapter 14 may be fixed.

  The present invention is applicable to, for example, a load receiving table lifting device provided at the rear of a load carrier of a truck.

1 Loading platform 2 Post 4 Slider 5 Tailgate (loading platform)
6 Hydraulic cylinder 7 Cross member 9A, 9B Wire 10 Hydraulic power unit 11 Electric motor 12 Hydraulic oil tank 13 Hydraulic pump 15 Valve block (valves)
17A, 17B Flexible tube ( flexible tube in the unit)
17C flexible tube (flexible tube for cylinder)
16 base plate 165 valve block mounting plate 167 hexagon socket head cap screw (valves only fixture)

Claims (3)

Posts erected on both sides of the rear end of the vehicle loading platform, a slider provided so as to be movable up and down along the post, a load receiving platform supported by the slider, and a cross member installed between the posts In a load receiving platform lifting apparatus, comprising: a hydraulic cylinder that moves up and down the slider via a wire; and a hydraulic power unit that supplies pressure oil to the hydraulic cylinder,
The hydraulic power unit includes an electric motor, a hydraulic oil tank and a hydraulic pump fixed integrally with each other, and valves provided separately from these components, and is installed in the cross member.
The valves are connected to be able to communicate with the hydraulic cylinder via a flexible tube for a cylinder, and are connected to be able to communicate with the hydraulic oil tank and the hydraulic pump via a flexible tube in the unit .
The load receiving platform elevating device , wherein the valves are provided separately from the electric motor, the hydraulic oil tank, and the hydraulic pump via the unit flexible tube . The load receiving table lifting device according to claim 1,
The valves of the hydraulic power unit are fixed in the cross member exclusively by a valve fixing fixture that fixes the valves in the cross member, and by releasing the fixing by the valve fixing fixture, A load receiving table elevating device, wherein the device is provided so as to be removable from the cross member. The load receiving table lifting device according to claim 2,
The load receiving platform elevating device characterized in that the valve-specific fixing tool is inserted or removed in the vehicle front-rear direction to fix or release the valves .

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