JP3302243B2 - Caster wheel suspension mechanism for reach type 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 simplified suspension mechanism in which the height of the suspension mechanism itself is low, the number of parts is extremely small and the suspension mechanism itself is improved. 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 reach-type forklift rear wheel suspension mechanism, as shown in FIG. 3, a parallel drive link 10 comprising an upper link 10A and an under link 10B for supporting a drive device 9 so as to be able to swing up and down. Caster link 1 for supporting caster wheel 8 so that it can swing up and down
8, the parallel drive link 10 is supported by frame shafts 12A and 12B fixed to the frame member 12 and drive shafts 9A and 9B fixed to the drive device 9, respectively. The drive device 9 is connected to the drive device 9 via the upper link 10A. Drive spring 1 pressed down against frame member 12
Three are arranged. The caster link 18 is supported by a frame shaft 12B, and the caster wheel 8 is connected to the underlink 10
A caster spring 19 that pushes down against B is arranged.

[0003] In a reach type forklift in which the height of the driver's cab floor from the road surface, which is called a low floor type, is low, the spring cannot be arranged above the caster link. Therefore, the caster link is extended to the left side, and the extension and the under link are connected by a caster spring.

[0004]

In the structure of the suspension mechanism of the low-floor reach-type forklift as described above, the distance between the fulcrum of the caster link and the caster spring cannot be made long. It is necessary to arrange strong connecting bolts in a narrow space, and there are large design constraints, many parts, high cost,
There were various problems such as poor maintainability.

An object of the present invention is to provide a suspension mechanism of a low-floor type reach forklift capable of absorbing the impact of a vehicle body only with a simple caster link structure without providing special equipment such as a spring.

[0006]

SUMMARY OF THE INVENTION The present invention comprises a vehicle body and a mast for moving a load up and down in front of the vehicle body. The vehicle body has a drive wheel for moving the vehicle body to two front straddle legs and a rear drive link. A caster wheel that rotates in accordance with the moving direction of the vehicle body is supported by a wheel and a rear caster link, and the caster link supports the caster wheel on one side, and the other end is bent round and fixed to the frame member of the vehicle body on the inner side. And a rear wheel suspension mechanism of a reach type forklift in which the outermost end is pressed against the vehicle body.

The caster link according to the present invention absorbs the load on the caster link due to the road surface condition and the inclination of the vehicle body by the elasticity of the caster link itself without using a special spring or the like, relieves the impact, and further reduces the inclination of the vehicle body. Is also a structure that suppresses.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
Is the body 2, two straddle legs 3 in front of the body 2,
A mast 4 inside the two straddle legs 3, a load wheel 5 at the tip of the straddle leg 3, a rear wheel suspension device 6 inside the rear of the vehicle body 2, and a drive wheel 7 for moving the vehicle body 2 to a lower portion of the rear wheel suspension device 6; The vehicle includes a caster wheel 8 that rotates with the moving direction of the vehicle body 2.

As shown in FIG. 1, a rear wheel suspension device 6 includes a parallel drive link 10 comprising an upper link 10A and an under link 10B for supporting a drive device 9 including a drive wheel 7 so that the drive device 9 can swing up and down. A parallel drive link 1 having caster links 11 swingably supported.
Reference numeral 0 denotes a drive spring that is supported by the frame shafts 12A and 12B fixed to the frame member 12 and the drive shafts 9A and 9B fixed to the drive device 9, and pushes down the drive device 9 against the frame member 12 via the upper link 10A. 13 are arranged.

As shown in FIG. 2, the caster link 11 according to the present invention is a leaf spring and has a pivot pin 14 welded to one end.
Supports the caster wheel 8. The other end is bent so as to form a so-called centerpiece. The eye portion 15 is supported by the frame shaft 12B together with the under link 10B via a bush (not shown) inserted inward, and serves as a fulcrum for swinging. A stopper member 16 is welded to the outside of the eyeball portion 15, and the stopper member 16 comes into contact with the rib 17 of the underlink 10B to make the caster link 11
Prevents upward rotation of. The rotational moment of the under link 10B due to the drive wheel weight and the rotational moment of the caster link 11 due to the caster wheel weight balance through the contact portion. When the drive wheel 7 or the caster wheel 8 is pushed up from the road surface, the caster link 11
Absorbs shock by bending as a leaf spring.

[0013]

As described above, the operating device for a reach-type forklift of the present invention, having the above-described structure, absorbs an impact or inclination to the vehicle body while keeping the getting on / off property at the time of driving low. In addition, the structure is extremely simplified as compared with the conventional suspension mechanism, the number of parts is reduced, the cost is reduced, and at the same time, the assemblability and maintainability can be greatly improved.

[Brief description of the drawings]

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

FIG. 2 is a rear view showing the caster link of the present invention.

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

FIG. 4 is a perspective view of a reach type forklift.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Reach type forklift 2 Body 3 Straddle leg 4 Mast 5 Road wheel 6 Rear wheel suspension device 7 Drive wheel 8 Caster wheel 9 Drive device 9A Drive shaft 9B Drive shaft 10 Parallel drive link 10A Upper link 10B Under link 11 Caster link 12 Frame member 12A Frame shaft 12B Frame shaft 13 Drive spring 14 Pivot pin 15 Eyeball 16 Stopper member 17 Rib 18 Caster link 19 Caster spring

Claims (1)

(57) [Claims] 1. A vehicle comprising a vehicle body and a mast for moving a load up and down in front of the vehicle body. The vehicle body includes a load wheel on two front straddle legs, a drive wheel for moving the vehicle body on a rear drive link, and a vehicle wheel on a rear caster link. Each caster wheel that rotates with the moving direction is supported,
The caster link supports the caster wheel on one side, and the other end is bent round and the frame shaft fixed to the frame member of the car body is inserted inside and the rear end suspension mechanism of the reach type forklift with the extreme end pressed against the car body .