JP3304765B2 - Rear suspension mechanism for reach forklift - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reach type forklift in which a lower link and a caster link are pivotally supported on a link pin, in which a lower link and a caster link are prevented from rattling and traveling noise and vibration are prevented. The present invention relates to a rear wheel suspension mechanism for a forklift.

[0002]

2. Description of the Related Art For example, in a conventional rear wheel suspension mechanism of a reach type forklift, as shown in FIG.
2 and caster link 8 are one link pin 1 on the same axis.
3A, each is supported so as to be swingable independently via four slide bearings 17. One end of the link pin 13A is supported by a hole of the vehicle body 1 frame member, while the other end is supported by a hole of the vehicle body 1 frame member via a sleeve 18 that can slide back and forth. Further, the tip is a screw, and the nut 1
It is a structure that pushes 8 in. The clearance before and after the lower link 12 can be adjusted by the degree of the pushing of the sleeve 18.

[0003]

In the above-mentioned prior art, the lower link is a frame structure composed of two parallel link members and a joining member for joining them, and the caster link is formed of the lower link. It is located inside the frame. Therefore, even if rattling before and after the lower link can be eliminated, it is impossible to adjust the clearance before and after the caster link inside the lower link.

[0004] For this reason, there is a problem in that the caster link portion rattles back and forth during traveling, particularly at the time of starting and braking, causing abnormal noise and vibration. An object of the present invention is to make it possible to adjust the gap before and after the caster link, and to prevent abnormal noise and vibration.

[0005]

SUMMARY OF THE INVENTION The present invention relates to a reach type forklift in which a lower link of a link mechanism supporting a drive wheel and a caster link supporting a caster wheel are swingably supported by a body frame by link pins. In the rear wheel suspension mechanism, both ends of the link pin are respectively supported in holes of the vehicle body frame, and one end of the link pin is supported in the hole of the vehicle body frame via a first sleeve and a screw is formed. The lower link and the caster link are supported by the link pins via slidable slide bearings, respectively, and a second sleeve is provided between the lower link and the caster link. Is provided, and the first nut is used for the first nut.
The first sleeve pushes the second sleeve through the slide bearing of the lower link, so that the gap between the lower link and the caster link can be adjusted. Is a rear wheel suspension mechanism of the reach type forklift.

[0006]

As shown in FIG. 6, a reach type forklift embodying the present invention has a vehicle body 1, two straddle legs 2 in front of the vehicle body 1, two masts 3 inside two straddle legs 2, and a front end of the straddle leg 2 as shown in FIG. Load wheel 4, rear wheel suspension device 5 inside rear body 1, rear wheel suspension device 5 includes drive wheel 6 for moving vehicle body 1 in the lower part, and caster wheel 7 that rotates with the moving direction of vehicle body 1. I have.

As shown in FIGS. 1 and 2, the rear wheel suspension device 5 in this embodiment has a caster link 8 having a shape as shown in FIG. 5 for supporting the caster wheel 7, and a spring 9A for adjusting the wheel load of the caster wheel 7. An upper link 11 for supporting a drive device 10 including the drive wheel 6, a lower link 12 having a shape as shown in FIG. 4, and a spring 9 </ b> B serving as a shock absorber for the drive wheel 6.

The caster link 8 has a link pin 13 at the end.
At A, it is swingably mounted on one body frame. The lower link 12 has an end portion at the drive device 10 with a link pin 13B and a central portion at the link pin 13A with the vehicle body 1.
It is swingably mounted on the frame. That is, the link pin 13A supports the vehicle body 1 frame at both ends, the lower link 12 inside the frame, and the caster link 8 inside the frame.

The attachment of the above-mentioned members to the link pin 13A, which is a feature of the present invention, is such that one end of the link pin 13A is directly fitted and supported in a hole of the body 1 frame member, and the other end is slid forward and backward. The first sleeve 14A is supported by a hole of a frame member of the vehicle body 1 via a movable first sleeve 14A, and the tip of the first sleeve 14A is pushed in by a nut 15. The first sleeve 14A abuts on an end face of a slide bearing 16A which is slidably mounted on one link member of the lower link 12 back and forth, and the slide bearing 16A is connected to one link member of the lower link 12 and the caster link 8. Between the link pin 13
The second sleeve 14B slidably fitted into A is pushed in. The front and rear gaps of both the caster link 8 and the lower link 12 can be adjusted at the same time depending on how the second sleeve 14B is pushed.

That is, depending on the degree of tightening of the nut 15 at the tip of the link pin 13A, the slide bearings 16C and 16D fix the lower link, and the slide bearings 16B and 16C fix the caster link so that only the shaft can rotate freely. The rattling of the caster link 8 as well as the caster link 12 can be eliminated.

[0011]

According to the support structure of the lower link and the caster link in the rear wheel suspension device of the reach type forklift according to the present invention, the frame, the lower link and the caster link do not require strict processing accuracy, and adjustment by shim. In addition, the rattling of the nut at the end of the link pin A can prevent rattling before and after the caster link as well as the lower link. Can be prevented.

[Brief description of the drawings]

FIG. 1 is a top view showing a rear wheel suspension mechanism of the present invention.

FIG. 2 is a rear view showing the rear wheel suspension mechanism of the present invention.

FIG. 3 is a top view showing a conventional rear wheel suspension mechanism.

FIG. 4 is a top view showing the lower link.

FIG. 5 is a top view showing caster links.

FIG. 6 is a perspective view of a reach type forklift.

[Description of Signs] 1 body 2 straddle leg 3 mast 4 road wheel 5 rear wheel suspension 6 drive wheel 7 caster wheel 8 caster link 9A spring 9B spring 10 drive device 11 upper link 12 lower link 13A link pin 13B link pin 14A sleeve 14B Sleeve 15 Nut

Claims (1)

(57) [Claims] In a rear wheel suspension mechanism of a reach type forklift, a lower link of a link mechanism supporting a drive wheel and a caster link supporting a caster wheel are swingably supported by a body frame by a link pin. Both ends of the pin are respectively supported in holes of the body frame, and one end of the link pin is supported in the hole of the body frame via a first sleeve, is formed with a screw, and is provided with a nut. The lower link and the caster link are supported by the link pins via slidable slide bearings, respectively, and a second sleeve is provided between the lower link and the caster link. The first sleeve is pushed into the second sleeve through the lower bearing slide bearing by pushing the first sleeve in. Push the sleeve, wheel suspension mechanism after reach forklift, characterized in that to be able to adjust the gap between the lower link and the caster link.