JPH0114545Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a steering system for a forklift truck.

BACKGROUND ART Conventionally, in a forklift equipped with a driver's cab that is raised and lowered together with a fork by a lifting device fixed to the vehicle body, the structure of the steering device has generally been as shown in FIGS. 1 to 4.

In the drawing, the drive wheel 1, which also serves as steering wheel, is an electric motor 2.
The speed reducer 3 is rotatably mounted on a ball receiving ring 5 fixed to the vehicle body 4. A steering wire 6 is wound around the upper part of the reducer 3, and one end of the wire 6 is attached to a steering ring 7.
It is fixed to the stopper 8 of. Next, the steering wire 6 is connected to the lift cylinder 1 located in the center of the mast 9.
The chain 14 extends up along both sides of the driver's seat 11 and is connected to the end of a chain 14 that is attached to a chain wheel 13 fixed to a steering handle 12 of a driver's seat 11.
In the above-mentioned steering device, when the steering wire 6 is used for a long period of time, the steering handle 12 may elongate and the steering handle 12 may become loose due to the wire itself stretching or play in various parts.
play occurs. In order to adjust the play in such a case, a turnbuckle 16 is provided in the middle of the steering wire 6, and a hook 18 and a wire fitting 17 are provided.
is screwed in to adjust the tension of the steering wire 6.

In the turnbuckle structure as described above,
Even if you apply a spanner to the turnbuckle 16 and try to turn it, the metal fitting 17 and hook 18 will twist together with the wire 6, so the turnbuckle 16 can only be turned after the metal fitting 17 and hook 18 are fixed with a tool, which requires two workers. It was necessary. Further, since the turnbuckle 16 is located inside the mast 9, the operator must ride on the vehicle body 4 and work at a high position.

As described above, the conventional wire adjustment mechanism has the disadvantage that it is difficult to operate and requires two operators.

The present invention was developed in view of the above circumstances, and its purpose is to enable one worker to easily adjust the wire tension with one hand, and to position the wire adjustment mechanism at a low level from the ground. An object of the present invention is to provide a steering device for a forklift truck that can be installed in a forklift truck and facilitates wire adjustment work.

Hereinafter, the present invention will be explained with reference to FIG. 5 and subsequent figures. In the drawing, 21 is a vehicle body, and the vehicle body 21 is provided with a lifting device 22, which is lifted and lowered by a pair of left and right lift cylinders 23. The vehicle body 21 is provided with a driver's cab 24, and the vehicle body 21 is rotatably provided with a reduction gear 32 including an electric motor 50, and a steering wheel 31 is provided on the output side of the reduction gear 32. A steering ring 51 is provided around the speed reducer 32 .

A steering handle 28 is provided on the driver's cab 24, and a chain wheel 25 and second and third pulleys 52, 53 are pivotally supported on the driver's cab 24.
The steering handle 28 and the chain wheel 25 are interlocked via a gear mechanism 54. Fourth and fifth pulleys 55 and 5 are located above the lifting device 22.
6 is pivotally supported, and sixth and seventh pulleys 57 and 58 are pivotally supported below the lifting device 22. Further, on the vehicle body 21 side, 8th, 9th, 10th, 11th pulleys 60, 61, 62, located before and after the reducer 32,
63 is pivotally supported.

The wire 29, whose one end is locked to the steering ring 51 of the speed reducer 32 and is wound, is connected to the ninth wire 29.
Pulley 61, 11th pulley 63, 6th pulley 57,
The wire 29 connected to the chain 25' is connected to the chain 25' wound around the chain wheel 25 via the fourth pulley 55 and the third pulley 53. 7
After being wound, it is locked to the steering ring 51 via the pulley 58, the tenth pulley 62, and the eighth pulley 60.

8 and 9 show wire tension adjustment mechanisms A provided on both sides of the reducer 32.

This wire tension adjustment mechanism A is equipped with a lever 42 that is swingably attached to the frame 64 of the vehicle body 21 with a pin 43.
A pulley 62 (eleventh pulley 63) is attached to the shaft 48. Further, a nut member 45 is rotatably provided at the tip of the lever 42 by a pin 44, and an adjustment bolt 46 rotatably provided on the frame 64 is screwed into this nut member 45.

By turning the steering handle 28, the wire 29 is drawn in and the reducer 32 is rotated to turn the steering wheel 31 and perform steering.

To adjust the tension of the wire 29, use the box wrench 47 through the hole in the frame 64 as shown in FIG.
5, rotate the adjustment bolt 46 with this box wrench 47, send the nut member 45, and tighten the lever 42.
This is done by swinging and moving the tenth pulley 62.

As described in detail above, in the present invention, by rotating the steering handle 28 of the driver's cab 24, the steering ring 51 around which the wire 29 is wound is turned via the wire 29, thereby steering the vehicle. In this case, one of the pulleys 60, 62 on which the wire 29 is hung in an S-shape is attached to the frame 64.
A lever 42 is swingably attached to the lever with a pin 43.
This is a steering device for a forklift truck, characterized in that a nut member 45 is rotatably provided on a lever 42, and an adjustment bolt 46 rotatably provided on a frame 64 is screwed into the nut member 45. .

Therefore, by rotating the adjustment bolt 46 with a rotary tool, the lever 42 can be swung and the pulley can be moved to adjust the tension of the wire, which can be easily done by one worker with one hand. Moreover, the wire adjustment mechanism can be installed at a low position from the ground, making wire adjustment work easier.

[Brief explanation of the drawing]

Figure 1 is a plan view of a conventional forklift truck steering system, Figure 2 is a side view of the same, and Figure 3 is a top view of a conventional forklift truck steering system.
Fig. 4 is an enlarged view of the part shown in Fig. 3, Fig. 5 is a plan view of an embodiment of the present invention, Fig. 6 is a side view of the same, Fig. 7 is a view taken from the direction of Fig. 5. 8 is a side view of the wire tension adjustment device, and FIG. 9 is a plan view thereof. 29 is a wire, 42 is a lever, 45 is a nut member, 46 is an adjustment bolt, and 60 and 62 are pulleys.

Claims (1)

[Scope of utility model registration request] By rotating the steering handle 28 of the driver's cab 24, the wire 29 is connected via the wire 29.
In a device in which steering is performed by rotating a steering ring 51 wound with
One of the pulleys 60 and 62 hung in the shape of a letter is pivotally supported on a lever 42 which is swingably attached to a frame 64 with a pin 43, and a nut member 45 is rotatably provided on the lever 42. Connect the rotatably provided adjustment bolt 46 to the nut member 4.
A steering device for a forklift truck, characterized in that the steering device is screwed into the forklift truck.