JP2870213B2 - Forklift body drive system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle body driving device for a forklift equipped with a push-pull device, and more particularly to a vehicle body driving device used for moving a vehicle body in synchronization with a push-pull operation of the push-pull device. .

[0002]

2. Description of the Related Art As a conventional vehicle drive device of this kind,
There are a vertical type shown in FIG. 8 and a horizontal type shown in FIG. In the case of the vertical driving device, a housing 35 having a driving roller 34 is vertically disposed on the outer surface of the mast 32, and a substantially central rear portion in the vertical direction is attached to a front and rear rotatable by a mounting pin 36. The driving roller 34 is always held at a position where the driving roller 34 is separated from the tire 33 by the spring 37. Then, at the time of the cargo handling operation by the push-pull device, the housing 35 is rotationally displaced by the pressing cylinder 38 to a position where the driving roller 34 is brought into contact with the tire 33, and in this state, the driving roller 34 is moved in association with the push-pull operation. Driving tire 3
3, the vehicle body 31 is moved forward or backward in synchronization with the push-pull operation of the push-pull device.

In the case of a horizontal drive device, a housing 35 provided with a drive roller 34 is disposed laterally on the outer surface of the mast 32, and a substantially central upper portion in the front-rear direction is vertically rotated by a mounting pin 36. It is the same as the vertical type except that it is movably mounted. Note that the housing 35 is formed in a substantially rectangular box shape.
Although not shown, this is to secure a storage space for a hydraulic actuator such as a hydraulic motor for driving the roller or a hydraulic cylinder and a drive unit including its power transmission means.

[0004]

However, in the case of the above-described conventional vehicle body driving device, when the driving roller 34 is tilted in order to contact the tire 33 with the longitudinally-rotatable vertical mounting type, when the driving roller 34 is tilted to contact the tire 33, the imaginary line shown in FIG. As shown in FIG.
Projecting forward from the front surface of the push-pull device and interfering with the push-pull device as an attachment. Therefore, as a result of moving the push-pull device forward and attaching it in order to avoid this interference, there is a problem that the lost load increases. In addition, because of the front-rear rotation type, there is also a problem that it is difficult to make the driving roller 34 contact with the tire 33 when the tire 33 is worn, as indicated by a virtual line. On the other hand, in the case of the vertically-rotatable horizontal type, the front and rear mounting space occupied by the housing 35 is increased and the vehicle approaches the vehicle body, so that the rearward tilt angle of the mast 32 is reduced, making practical use of the mast 32 difficult.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, the present invention has a technical problem to be solved to reduce the front and rear space occupied by a vehicle body driving device mounted on an outer surface of a mast.

[0006]

Means for Solving the Problems In order to solve the above problems, the present invention is configured as follows. That is, the forklift body driving device of the present invention is a housing provided with a driving roller for driving the tire by rotating while being in contact with the outer peripheral upper surface of the tire and a driving portion thereof, and the housing on the mast outer surface. A housing supporting means for supporting the housing such that the housing can be displaced substantially linearly in the vertical direction, and displacing the housing to a driving position where the driving roller is pressed against the tire and a rest position separated from the tire. Means.

[0007]

In the vehicle body driving apparatus according to the present invention, the housing is displaced substantially linearly along the vertical direction of the outer side surface of the mast so that the driving roller is brought into contact with or separated from the tire. , From the front or rear side of the mast. In other words, the front and rear space occupied by the device mounted on the outer side of the mast is reduced. Further, since the displacement is a linear displacement in the vertical direction along the mast, the displacement amount can be set to be large.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below with reference to the drawings. First, a first embodiment will be described with reference to FIGS. FIGS. 4 and 5 show a push-pull device 4 mounted on the front of a lift bracket 3 that is moved up and down along a mast 2 of a forklift. The push-pull device 4 has a face plate 6 for pushing out a load on the platen 5, and the face plate 6 is pushed and pulled through a pantograph 8 by the expansion and contraction of a push-pull cylinder 7. It has a gripper 9 at its lower end for gripping a sheet pallet.

Next, a vehicle body driving device 10 for moving the vehicle body 1 back and forth in synchronization with the pushing and pulling operation of the face plate 6 of the push-pull device 4 will be described with reference to FIGS. The vehicle body driving device 10 includes a housing 11 formed in a vertically long, substantially rectangular box shape that fits within the front-rear width of the mast 2. A drive roller 13 for driving the tire 12 is provided on a lower side of the housing 11,
The drive roller 13 is driven by a drive unit (not shown) housed in the housing 11 (which includes a hydraulic actuator such as a hydraulic cylinder or a hydraulic motor for driving the roller and a power transmission mechanism such as a gear train for transmitting the power). It is designed to be driven.

The housing 11 is supported by housing support means so that it can be displaced substantially linearly in the vertical direction with respect to the outer side surface of the mast 2. It is configured. That is, the upper and lower two equal-length links 15 each have an
6, and the other end is rotatably attached to the upper and lower portions of the housing 11 via two upper and lower mounting pins 17. The mounting pitch of the two mounting pins 16 on the mast side and the mounting pitch
By setting the mounting pitches of the mounting pins 17 to be equal to each other, the housing 11 is supported in a vertically installed state parallel to the mast 2.

The housing 11 supported as described above is displaced between the rest position shown in FIG. 1 where the drive roller 13 is isolated from the tire 12 and the drive position shown in FIG. And an isolation spring 18,
A single-acting pressing cylinder 21 for contact pressure is provided.
The isolation spring 18 has one end locked to a pin 19 provided on the mast 2, the other end locked to a pin 20 provided to the housing 11, and a pressing cylinder 21.
Has one end rotatably mounted on the upper link mounting pin 16 on the mast side, and the other end rotatably mounted on the lower mounting pin 17 on the housing side.

The vehicle body driving device 10 of the present embodiment is configured as described above, and when the forklift is running,
The housing 11 is pulled up by a spring 18 and held in the rest position shown in FIG. During the cargo handling operation by the push-pull device 4, the housing 11 is pushed down by the extension operation of the pressing cylinder 21, and the driving roller 13 is brought into contact with the outer peripheral upper surface of the tire 12 at a predetermined pressure.
In this state, when the push-pull cylinder 7 of the push-pull device 4 is extended or contracted to push and pull the face plate 6, the vehicle body driving device 1
The drive unit 0 is also operated to rotate the drive roller 13 clockwise or counterclockwise to drive the tire 12, so that the vehicle body 1 is moved forward or backward in synchronization with the push-pull operation of the face plate 6. After loading or unloading the load by the push-pull device 4, the pressing cylinder 21
Is connected to the tank, the housing 11 is pulled up to the rest position by the spring 18, and the drive roller 13 is separated from the tire 12.

Thus, the vehicle body driving device 10 of the present embodiment
Since the housing 11 is supported by the parallel link 14, when the housing 11 is displaced between the rest position and the driving position as described above, the two upper and lower mounting pins 16 on the mast side are connected. It is possible to move the mast 2 substantially linearly in the vertical direction while maintaining a parallel state with respect to the mast 2 as a center of rotation. This makes it possible to minimize the amount of longitudinal displacement and prevent the mast 2 from projecting from the front or rear surface. You.

Next, a second embodiment of the present invention will be described with reference to FIGS.
It will be described based on. In the second embodiment, a slide guide type is used instead of the parallel support 14 as the housing support means. That is, the cross section T
A vertically long slide guide 22 having a character shape is fixed, and a slide rail 23 having a substantially C-shaped cross section provided on the housing 11 is fitted to the slide guide 22 so as to be vertically movable, and a spring 18 for lifting the housing 11 is provided. ,
The pressing cylinder 21 to be pressed down is disposed above the housing 11. Other configurations are the same as those of the first embodiment.

Therefore, the vehicle body driving device 10 according to the second embodiment
According to this, the housing 11 can be displaced between the rest position and the driving position without protruding from the front and rear surfaces of the mast 2 as in the case of the first embodiment.

[0016]

As described above in detail, the vehicle body drive device of the present invention can be displaced between the rest position and the drive position within the front-rear width of the mast, so that the space occupied in the front-rear direction can be reduced. As a result, it is possible to solve the problem of lost load and the problem of decreasing the tilt angle after mast of the horizontal type, which are found in the conventional vertical type. In addition, since the vehicle body drive device is displaced between the rest position and the drive position by moving the vehicle body drive device substantially linearly in the vertical direction, the displacement amount can be set relatively large.
This has the advantage that the allowable wear of the tire can be increased.

[Brief description of the drawings]

FIG. 1 is a side view showing a vehicle body drive device at a rest position according to Embodiment 1 of the present invention.

FIG. 2 is a side view showing the vehicle body driving device similarly displaced to a driving position.

FIG. 3 is an exploded perspective view showing the vehicle body drive device.

FIG. 4 is a schematic side view of a forklift provided with a push-pull device.

FIG. 5 is a schematic plan view of a forklift provided with a push-pull device.

FIG. 6 is a side view showing a vehicle body drive device according to a second embodiment of the present invention.

FIG. 7 is a plan sectional view of the same.

FIG. 8 is a side view of a conventional vertical vehicle body drive device.

FIG. 9 is a side view of a conventional horizontally mounted vehicle body driving device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Body 2 ... Mast 4 ... Push-pull apparatus 10 ... Body driving apparatus 11 ... Housing 12 ... Tire 13 ... Drive roller 14 ... Parallel link 18 ... Isolation spring 21 ... Pressing cylinder 22 ... Slide guide 23 ... Slide rail

Claims (1)

(57) [Claims] 1. A housing provided with a driving roller for driving the tire by rotating while being brought into contact with the outer peripheral upper surface of the tire, and a housing provided with the driving portion, and the housing being substantially straight along a mast outer surface in a vertical direction. A forklift comprising: housing support means for supporting the housing so as to be capable of being displaced; and means for displacing the housing between a driving position where the driving roller is pressed against the tire and a rest position separated from the tire. Body drive.