JP2601561Y2 - Vehicle packing box tilting device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tilting device for a vehicle packing box which supports a packing box mounted on an underframe so as to be tiltable.

[0002]

2. Description of the Related Art Generally, such a tilting device for a vehicle packing box includes a lift arm having one end pivotally supported by the packing box, one end being pivotally supported by the other end of the lift arm, and the other end being supported by a chassis frame. The vehicle includes a pivotally supported tension link, and a hydraulic cylinder having a base end supported by the underframe and a distal end supported by the lift arm. The pivot point between the other end of the lift arm and one end of the tension link moves upward while the lift arm and the tension link are unfolded due to the extension of the hydraulic cylinder when the load box tilts, while the hydraulic pressure increases when the load box tilts. The lift arm and the tension link are folded and moved downward by the contraction of the cylinder.

[0003]

However, in the above-mentioned tilting device, since the pivot point between the other end of the lift arm and one end of the tension link is a free end that is not supported by the packing box or the underframe, the tilting device can be used over time. The pivot point is lowered when the carton falls down due to oil leaks in the hydraulic cylinder due to unusual use.
There is a drawback in that so-called tilting of the tilting device occurs, and the lift arm and the tension link interfere with a drive system member, a vehicle body member, and the like disposed below the underframe.

[0004] The present invention has been made in view of such a point, and an object of the present invention is to suppress the downward movement of the pivot point when the packing box is laid down with a simple structure, and to generate the dripping. To reliably prevent the tilting device from interfering with the drive system member and the vehicle body member.

[0005]

Means for Solving the Problems In order to achieve the above object, a solution taken by the invention of claim 1 is a device for tilting a cargo box mounted on a chassis frame as a device for tilting a vehicle cargo box. A lift arm, one end of which is pivotally supported by the packing box, one end of which is pivotally supported by the other end of the lift arm, and the other end of which is pivotally supported by the underframe. And a hydraulic cylinder having a base end supported by the underframe and a distal end supported by the lift arm. A pivot point between the other end of the lift arm and one end of the tension link is tilted by a cargo box. At the same time, the lift arm and the tension link are expanded and moved upward by the extension of the hydraulic cylinder, while the lift arm and the tension link are folded and moved downward by the contraction of the hydraulic cylinder when the cargo box tilts. It is as to cause. Then, a bracket extending in the vehicle width direction is provided between the left and right sides of the corresponding chassis frame at the lower end position of the pivot point, and restricts the downward movement of the pivot point at a position below the pivot point at the lower end position. The drive system member and the vehicle body member disposed below the underframe are prevented from interfering with the lowering of the lift arm and the tension link when the cargo box falls down.

A second aspect of the present invention is to solve the problem by providing the lower surface of the lift arm and the tension link according to the first aspect of the present invention in such a manner that the lower surface of each of the lower surfaces of the lift box and the central portion of the lower surface in the longitudinal direction of the vehicle body when the carton falls down. Are formed in a bow shape so as to be located above the front and rear ends.

[0007]

With the above arrangement, the invention according to claim 1 has the following features.
A simple bracket with a structure in which the pivot point between the other end of the lift arm and one end of the tension link extends in the vehicle width direction between the left and right sides of the corresponding chassis frame at the lower end position allows the oil in the hydraulic cylinder to be used over time. Even if the pivot point goes down when the cargo box falls down because it is a free end due to leakage, etc., the downward movement of the pivot point is regulated and the generation of the tilting device is stopped, and the drive under the chassis frame is stopped Interference due to downward movement of the lift arm and the tension link with respect to the system member and the vehicle body member is reliably prevented.

According to the second aspect of the present invention, since the lower surfaces of the lift arm and the tension link are each formed into an arcuately curved shape, the central portions of the lift arm and the tension link correspond to the vehicle when the cargo box falls down. A vertical space is formed between the drive system members and the like, and the lift arm and the tension link are lowered (drive system member side) by using this space while holding a gap that does not contact the drive system members. And the floor surface of the packing box can be lowered with the lower arrangement of the lift arm and the tension link.

[0009]

As described above, according to the tilting device of the vehicle luggage box according to the first aspect of the present invention, the bracket for restricting the downward movement of the pivot point located at the lower end position when the luggage box falls down is provided on the underframe. By stopping the tilt of the tilting device provided between the left and right sides, it is possible to reliably prevent the lift arm and the tension link from interfering with the drive system member and the vehicle body member. Damage to the members can be prevented and the durability of each member can be improved. Moreover, since the bracket itself has a simple structure, it is very advantageous in implementation.

According to the device for tilting a vehicle cargo box according to the present invention, the center between the lower surface of each of the lift arm and the tension link when the cargo box is laid down, and a drive system member of the vehicle. By utilizing the space, the lift arm and the tension link can be disposed below while maintaining a gap between the drive system member and the floor space of the packing box can be reduced.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings.

FIG. 5 shows a vehicle using the tilting device for a vehicle luggage box according to one embodiment of the present invention. Reference numeral 1 denotes an underframe of a vehicle V connected to the rear of the cabin 2; A tiltable loading platform mounted on top. The underframe 1 is a frame 4 having a closed cross-section extending in the front-rear direction on the left and right sides of the vehicle body.
And cross members 5 and 5 (shown only at the front end and the rear end in the figure) which connect the two frames 4 and 4 at predetermined positions in the front-rear direction.

Hinges 11, 12, 13, and 14, which constitute the center of tilt of the packing box 3 with respect to the underframe 1, are provided at four positions in the front, rear, left and right directions of the underframe 1, that is, at the front and rear positions of each frame 4. A lock lever 15 that forms the center of the hinge is removably fitted into each of the hinge portions 11, 12, 13, and 14. That is, each hinge part 11, 1
The hinge part from which the lock lever 15 is removed is opened while the hinge part into which the lock lever 15 is inserted can be the hinge center. The tilting of the underframe 15 with respect to the chassis frame 1 is performed about the hinge portion into which the hinge 15 is inserted. For example, the packing box 3 can be tilted rearward by pulling out the lock lever 15 from the front hinge portions 11 and 12 of each frame 4 and inserting the lock lever 15 into the rear hinge portions 13 and 14 of each frame 4. On the other hand, the lock lever 15 is pulled out from the hinge portions 11 and 13 in front and behind the left frame 4 (or the hinge portions 12 and 14 in front and behind the right frame 4) and the front and rear portions of the right frame 4 are removed. The lock lever 15 is inserted into the hinge portions 12 and 14 (or the hinge portions 11 and 13 in front of and behind the left frame 4) so that the lock lever 15 can be tilted to the right (to the left) and tilted in three directions. , A so-called three-turn dumping type packing box 3 is constituted.

As shown in FIGS. 2 to 4, on the lower surface of the left and right end portions of the packing box 3, packing box frames 20, 20 each having a substantially L-shaped cross section and extending in the longitudinal direction of the vehicle body are provided. I have. Further, a member 21 having a rectangular shape with a vertically long cross section extending in the vehicle width direction is provided between the packing box frames 20 located at the front end of the packing box 3.
A front end (one end) of a lift arm 23 is supported via a support portion 22. The lift arm 23 is a pair of left and right lift arm plates 2 having a substantially triangular shape when viewed from the side of the vehicle body.
4,24. The lower surface of each of the lift arm plates 24 is formed in a bow shape so that the center of the lower surface when the cargo box is laid down is located above the front and rear ends. The first support portion 22 is fitted to an outer cylinder member 25 fixed to the front end of the member 21 and to be rotatable about the horizontal axis extending in the vehicle longitudinal direction with respect to the outer cylinder member 25. An inner cylinder member 26 and a first horizontal shaft 27 extending in the vehicle width direction fixed to a rear end of the inner cylinder member 26 via a U-shaped bracket 26a. The front end of the arm 23) is coaxially rotatable relative to the central portion 27a of the first horizontal shaft 27.
It is stuck to. In this case, between the central portion of each lift arm plate 24 and the differential case D as a drive system member of the corresponding vehicle, the central portion of each lift arm plate 24 at the time of luggage box falling is a differential case. A gap that does not contact D is provided.

On the other hand, at the front end of the underframe 1 corresponding to the first support portion 22 (immediately behind the cross member 5 on the front end side), a member having a rectangular shape in cross section, which connects the left and right frames 4, 4. A bracket 28 is provided, and the member bracket 2 is provided.
The front end (the other end) of the tension link 30 is supported at the front end of the support member 8 via a second support part 29. The tension link 30 has a central portion at the front and rear ends when viewed from the side of the vehicle body when the carton falls down. A pair of left and right tension link plates 3 that are curved or warped in an arcuate manner so as to be located above the portion.
1, 31. The second support portion 29 has an outer cylindrical member 32 fixed to the front end of the member bracket 28 and an inner cylindrical member 32 rotatably fitted around the horizontal axis extending in the vehicle longitudinal direction with respect to the outer cylindrical member 32. A cylindrical member 33;
And a second horizontal shaft 34 extending in the vehicle width direction fixed to the rear end of the tension link plate 3.
The front end of 1 (tension link 30) is fixed to left and right end portions 34b, 34b which are coaxially rotatable relative to a central portion 34a of the second horizontal shaft 34. Further, a third horizontal shaft 35 extending in the vehicle width direction for pivotally supporting the rear end (the other end) of the lift arm 23 is provided at the rear end (one end) of the tension link 30. The third horizontal shaft 35 has a central portion 35a and left and right end portions 35b, 35b coaxially rotatable relative to each other, and a rear end of each of the tension link plates 31 is connected to the third horizontal shaft 35. The rear ends of the lift arm plates 24 are fixed to the central portion 35a of the third horizontal shaft 35 at the left and right ends 35b, 35b of the third horizontal shaft 35, respectively. In this case, there is a gap between the central portion of each tension link plate 31 and the differential case D corresponding to the central portion so that the central portion of each tension link plate 31 does not come into contact with the differential case D when the packing box falls down. Is provided.

Further, a hydraulic cylinder 41 that expands and contracts by supplying and discharging hydraulic oil from a hydraulic supply and discharge device (not shown) is linked between the lift arm 23 and the tension link 30. The hydraulic cylinder 41 has a fourth end extending in the vehicle width direction from a base end (front end) and a front end (rear end).
And the central portions 42a, 4 of the fifth horizontal shafts 42, 43
The left and right ends 42b, 42b, which are rotatable coaxially with respect to the central portion 42a of the fourth horizontal shaft 42, are attached to the front ends of the tension link plates 31 (the second support portions 29). Left and right ends 43b, 43b rotatable relative to a central portion 43a of the fifth horizontal shaft 43. 1 support section 22
(Front side than the front side). Then, the lift arm 23, the tension link 30, the hydraulic cylinder 41,
Each support part 22, 29 and each horizontal shaft 27, 34,
The tilting device 44 for tiltably supporting the packing box 3 with respect to the undercarriage frame 1 is constituted by 35, 42, and 43. The hydraulic cylinder 41 extends while elevating (deploying) the lift arm 23 and the tension link 30 so as to move the third horizontal shaft 35 serving as a pivot point with the rear end of the tension link 30 upward, and the lock lever 15 is inserted. The packing box 3 is mounted on the chassis frame 1 from the hinge side from which the lock lever 15 is pulled out with the hinge portion as the hinge center.
To tilt with respect to On the other hand, by discharging the hydraulic oil from the hydraulic cylinder 41, the hydraulic cylinder 4 is moved while the lift arm 23 and the tension link 30 are folded so that the third horizontal shaft 35 is moved downward.
1 contracts, and the packing box 3 falls down on the underframe 1.

As a characteristic part of the present invention, as shown in FIG. 1, when the packing box 3 is laid down, the third horizontal shaft 35 is positioned at the lower end position at the corresponding rear end of the chassis frame 1 (rear end portion). (In front of the cross member 5), a bracket 51 having a substantially U-shaped cross section extending in the vehicle width direction is provided so as to connect the left and right frames 4 and 4. The bracket 51
Since the third horizontal shaft 35 is located lower than the underframe 1 when the packing box 3 falls down, the inclined surface 51b inclined downward at the left and right ends so as to offset the central portion 51a downward. , 51b, and the outer ends of the left and right inclined surfaces 51b, 51b are fixed to the outer surfaces of the left and right frames 4, 4 and extend downward in a substantially U-shaped section. It is attached to the lower end of the bracket 52. That is, the bracket 51 is arranged such that the upper surface of the central portion 51a is located below the third horizontal shaft 35 located at the lower end position when the packing box 3 is lying down, with a gap X of, for example, about 15 mm. In this case, the bracket 51 is provided with an allowance in the space X for the third horizontal shaft 35 when the packing box 3 is laid down,
A function as a stopper for restricting the movement of the third horizontal shaft 35 further downward by abutting on the upper surface 1a and avoiding interference with the differential case D due to the downward movement of the lift arm 23 and the tension link 30. have.

The central portion 51a of the bracket 51
A cushion material 53 made of an elastic material such as rubber is provided on the upper surface.
Is affixed.

Below the third horizontal shaft 35, that is, below the bracket 51, a vehicle body member (not shown) of the vehicle V is disposed. Reference numeral 54 denotes a leaf spring for suspending a drive shaft (not shown) with respect to the underframe 1, and reference numeral 55 denotes a rear wheel.

Therefore, in the above embodiment, the third horizontal shaft 35 pivotally supporting the rear end of the lift arm 23 and the rear end of the tension link 30 is provided at the lower end position with the corresponding frame 4, 4 at the rear end of the chassis frame 1. Due to the bracket 51 extending in the vehicle width direction provided between the third horizontal shaft 35 and the free end due to oil leakage in the hydraulic cylinder 41 due to the use over time, the third horizontal shaft 35 is lowered even when the cargo box falls down. The third horizontal shaft 35 is at a predetermined distance (predetermined interval)
When the bracket 51 is lowered, it comes into contact with the cushion material 53 at the central portion 51 a of the bracket 51, and further downward movement is restricted, so that the tilting device 44 stops dripping and is disposed below the third horizontal shaft 35. The interference of the lift arm 23 and the tension link 30 with a driving system member such as a differential case D and a vehicle body member can be reliably prevented, and the tilting device 44 and the driving system member and the vehicle body member are prevented from being damaged. The durability of each member can be improved. Moreover, since the bracket 51 itself has a simple structure formed with the inclined surfaces 51b, 51b inclined downward at the left and right end portions, it is very advantageous in implementation.

Also, by attaching the cushion material 53 to the upper surface of the central portion 51a of the bracket 51, the third horizontal shaft 35 and the bracket 51 can be moved when the vehicle V is running.
The interference noise caused by the contact with the device can be reduced as much as possible.

Furthermore, since the lower surface of each lift arm plate 24 and each tension link plate 31 are formed in a curved shape in an arc, respectively, the center of each lift arm plate 24 and each tension link plate 31 when the cargo box falls down. Utilizing a space in the vertical direction formed between the corresponding differential case D and each lift arm plate 24 and each tension link plate 31 while holding a gap that does not abut the differential case D (differential). (The case D side), and the floor surface of the carrier 3 can be lowered by lowering the lift arm plates 24 and the tension link plates 31 to lower the floor of the carrier 3. it can.

It should be noted that the present invention is not limited to the above embodiment, but includes various other modifications.
For example, in the above-described embodiment, the bracket 51 is arranged so that the upper surface of the central portion 51a is located below the third horizontal shaft 35 located at the lower end position with a gap X of about 15 mm when the packing box 3 falls down. Alternatively, the bracket may be arranged such that the upper surface of the central portion is located without a gap immediately below the third horizontal shaft located at the lower end position.

Further, in the above-described embodiment, the three-inversion dumping type packing box 3 which can be tilted in three directions is configured. However, it is needless to say that the packing box 3 can be applied, for example, as a packing box tilting apparatus which can only tilt backward. .

Further, in the above embodiment, the bracket 51
The cushion material 53 is stuck on the upper surface of the central portion 51a of
A bracket to which a cushion material is not attached may be used.

[Brief description of the drawings]

FIG. 1 is a front view of a tilting device when a cargo box is laid down as viewed from the front of a vehicle.

FIG. 2 is a side view of the tilting device according to FIG. 1 as viewed from a side of the vehicle.

FIG. 3 is a plan view of the tilting device according to FIG. 1 as viewed from above the vehicle.

FIG. 4 is a bottom view of a front portion of the tilting device according to FIG. 1 as viewed from below the vehicle.

FIG. 5 is a side view of a rear portion of the vehicle in a state where the vehicle is partially cut away.

FIG. 6 is a longitudinal rear view of the tilting device cut in the vicinity of a central portion corresponding to a differential case.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Undercarriage frame 3 Luggage carrier 23 Lift arm 30 Tension link 35 Third horizontal shaft (pivot point) 41 Hydraulic cylinder 44 Tilting device 51 Bracket

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B60P 1/04

Claims (2)

(57) [Scope of request for utility model registration] 1. A loading box mounted on a chassis frame is tiltably supported via a tilting device. The tilting device includes a lift arm pivotally supported at one end by the load box, and a lift arm other than the lift arm. end one end of which is pivotally supported on a tension link whose other end is pivotally supported on the chassis frame, the chassis
The base is supported by the frame and the tip is supported by the lift arm.
A hydraulic cylinder, which is connected to the other end of the lift arm and one end of the tension link.
The pivot point is caused by the extension of the hydraulic cylinder when the packing box is tilted.
Lift arm and tension link unfolded upward
While the hydraulic cylinder contracts when the packing box tilts.
Causes the lift arm and tension link to fold
At the lower end position of the pivot point , between the left and right sides of the corresponding underframe at a position below the pivot point at the lower end position.
Bracket that regulates the downward movement of the vehicle extends in the vehicle width direction.
And the drive system members and components arranged below the chassis frame.
Lifter when the cargo box falls on
Interference due to downward movement of the arm and tension link
A tilting device for a vehicle luggage box, characterized in that the tilting is avoided . Wherein each lower surface of the lift arm and the tension link, so that the vehicle body longitudinal direction central portion of the respective lower surface at the time of packing boxes lodging is located upward than the end back and forth, are respectively curved bow shape The tilting device for a vehicle luggage box according to claim 1, wherein: