JPH1081495A - Rear axle mounting structure for industrial vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify a frame structure by mounting a counter weight onto a frame end member, and making up a structure in such a way that a rear axle is mounted to the aforesaid counter weight. SOLUTION: A counter weight 8 is fastened to a rear cross plate 5 making up a frame rear end part with bolts 12 in a state that it abuts against the rear surface of the aforesaid plate. A mounting boss part 14 acting as an axle mounting part is provided for the aforesaid counter weight 8, and an axle shaft 18 is mounted to the aforesaid mounting boss part 14 by way of a steering shaft 16 in such a way that it can be freely turned around a vertical axial line.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rear axle mounting structure suitable for an industrial vehicle, particularly a small battery forklift.

[0002]

2. Description of the Related Art FIG. 4 is an overall side view of a conventional small battery forklift, and FIG. 5 is an enlarged sectional view of a portion X in FIG. 4 showing a frame structure and a rear axle mounting structure. The conventional small battery forklift has a structure in which a front wheel 42 and a rear wheel 43 are attached to a frame, and a battery as a power source is housed in a central portion of the frame. That is, as shown in FIG.
1, a front cross plate (not shown) is provided upright at the front end, and a rear cross plate 32 is provided at the rear end.
, And side frames 33 are erected at both left and right ends, respectively, and they are mutually connected to form a box-shaped battery storage chamber 34.

[0003] A rear axle plate 35 is horizontally fixed to the rear center of the rear cross plate 32 at substantially the center in the vertical direction, and a rear axle 36 as a driven wheel axle is mounted on the rear axle plate 35. In order to enable steering, the rear axle 36 stands upright at the axial center of an axle shaft 37 to which rear wheels 43 are attached at both left and right ends, and the steering shaft 38 is connected to the rear axle plate 35
Is mounted via a bearing 40 to a mounting boss 39 which is welded to the boss.

A substantially U-shaped box plate 41 is fixedly attached so as to surround both side surfaces and a rear surface of the rear axle plate 35, and the box plate 41, the rear cross plate 32 and the rear axle plate 35 store the weight. A space was formed, and two divided left and right counterweights (not shown) were mounted here.

[0005]

However, in the conventional small battery forklift described above, the rear axle 3
6 is attached to the frame, the rear axle plate 35 and the box plate 41, as well as ribs and reinforcing plates, must be added to the rear of the rear cross plate 32 to form a rigid frame structure. The frame becomes complicated. In addition, since the counterweight is mounted on the rear axle plate 35, if a counterweight having a weight corresponding to the vehicle size is to be mounted, if there is a restriction in the vehicle width direction and the vertical direction, the tension in the rear of the vehicle is increased. This will be dealt with by going out, and as a result, the overall length of the vehicle will increase.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide a rear axle mounting structure for an industrial vehicle which is effective in simplifying a frame.

[0007]

Means for Solving the Problems In order to solve the above problems, the present invention is configured as follows. That is, the invention of claim 1 is characterized in that, in the rear axle mounting structure for an industrial vehicle, a counterweight is fixed to a frame end member constituting a rear end portion of the frame, and the rear axle is mounted to an axle mounting portion provided on the counterweight. Features.

According to the first aspect of the present invention, since the rear axle is attached to the counterweight, the rear portion of the vehicle can be formed by the counterweight. Can be omitted. For this reason, the frame structure can be simplified. Further, since the rear portion of the vehicle can be formed by the counterweight, it is possible to suppress or reduce the rearward extension when designing a counterweight having a weight corresponding to the vehicle size. for that reason,
It is possible to reduce the overall length of the vehicle and achieve a more compact vehicle.

In this case, the means for attaching the counterweight to the frame end member is not particularly limited. However, as in the invention of claim 2, in the rear axle attachment structure according to claim 1, the rear end is attached to the frame end member. It is desirable to provide a plurality of bosses protruding toward the rear, and fasten the counterweight to the rear cross plate with bolts in a state where the recesses provided in the counterweight are fitted to the bosses. When formed in this manner, the boss can receive the vertical load applied to the joint portion between the counterweight and the rear cross plate, so that the bolting operation can be performed easily and the load applied to the bolt in the same direction can be achieved. Can be eliminated or reduced.

[0010]

Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a cross-sectional view showing a frame structure, a counterweight mounting structure, a rear axle mounting structure, and the like. FIG. 2 is a cross-sectional view taken along line AA of FIG.
FIG. 3 is an overall side view of the small battery forklift. As shown in FIG. 1, the frame structure between the front wheel 1 and the rear wheel 2 shown in FIG. 3 is a box-shaped space for accommodating a battery as a power source as in the related art.

That is, on the lower frame 3, a front cross plate 4 is erected at a front end, a rear cross plate 5 is erected at a rear end, and side frames 6 are erected at both left and right ends. These are connected to each other to form a box-shaped battery storage chamber 7, and the upper surface of the battery storage chamber 7 is closed by a detachable toe board (not shown). The rear cross plate 5 is a frame end member that forms the rear end of the frame, and a counter weight 8 is attached to the rear of the rear cross plate 5 to form a rear portion of the vehicle.

The counterweight 8 is formed in a block shape having an outer surface shape preferable for forming a rear portion of the vehicle, and a plurality of counterweights 8 (4 in this embodiment) are provided on the left, right, upper and lower sides of the front end surface.
) Are formed with circular recesses 9 and tap holes 10. On the other hand, corresponding to this, four cylindrical bosses 11 are horizontally projected on the left, right, upper and lower sides of the rear surface of the rear cross plate 5. Therefore, the bolt 12 is inserted into the cylindrical hole of the boss 11 and screwed into the tap hole 10 with the front surface of the counter weight 8 abutting against the rear surface of the rear cross plate 5 so that the circular recess 9 fits into the boss 11. Thus, the counterweight 8 is fastened to the rear cross plate 5.

That is, in the present embodiment, the attachment means of the counterweight 8 has a fastening structure using screws. In this case, a configuration is adopted in which the circular recess 9 is fitted to the boss 11 of the rear cross plate 5. Since it is adopted to receive the vertical load acting between the counterweight 8 and the rear cross plate 5, the tightening work with the bolt 12 can be performed easily and the load in the shear direction acting on the bolt 12 can be reduced. This is advantageous for avoidance.

As shown in FIG. 2, an axle mounting space 13 having an open lower portion is formed at the center lower side of the counter weight 8 mounted as described above. A rear axle 15, which is a steering wheel axle, is mounted on a mounting boss portion 14 having a through hole 14a as an axle mounting portion provided so as to hang down. That is, the steering shaft 16 is penetrated through the through hole 14 a of the mounting boss portion 14 and is supported via the bearing 17 so as to be able to rotate horizontally. The axially central upper surface of the axle shaft 18 is fixed to the lower end of the steering shaft 16 by welding.
The rear wheel 2 is rotatably attached to both ends of the rear wheel.

A recess 26 having a flat bottom surface surrounded by left and right sides and a rear wall surface is formed in the upper portion of the counterweight 8, and the upper end of the steering shaft 16 is formed substantially in the center of the bottom surface of the recess 26. The part is protruding. A sprocket wheel 19 is fixed to the upper end of the steering shaft 16.
1. The gear is rotated via a steering gear 22, a small-diameter sprocket wheel 23, and a chain 24. The bracket 2 that rotatably supports the steering gear 22 and the small-diameter sprocket wheel 23.
Reference numeral 5 is attached to the front cross plate 4. In the center of the upper end of the front cross plate 4 and the rear cross plate 5, cutouts 4a and 5a for avoiding interference with the chain 24 are provided.

As described above, in this embodiment, the counter weight 8 is directly attached to the frame end member constituting the rear end of the frame, that is, the rear cross plate 5 constituting the rear wall of the battery storage chamber 7, Since the rear axle 15 is attached to the weight 8,
The rear portion of the vehicle is formed only by the counterweight 8. Therefore, the frame structure can be simplified as compared with the related art in which the rear axle is attached to the frame. That is, the conventional rear axle plate 35 and box plate 4 shown in FIG.
It is possible to abolish the frame structure including the connection of the iron plates as in the first embodiment.

According to the configuration in which the rear portion of the vehicle is formed by the counterweight 8, when the counterweight 8 is designed to have a weight corresponding to the vehicle size, the rearward extension can be suppressed or reduced as much as possible. In addition, the overall length of the vehicle can be shortened, and the vehicle can be downsized.

In the case where the rear axle 15 is mounted on the counterweight 8, if the mounting boss 14 with the through hole 14a is slightly complicated in shape, the counterweight 8 is generally a cast product. Since the rear axle mounting part can be simultaneously formed at the time of casting, the necessary machining is the rear cross plate 5
Except for the mounting portion for the bearing 17, only processing to obtain the fitting allowance of the bearing 17 is required. Therefore, there is no problem that the productivity of the counterweight 8 is reduced due to the setting of the rear axle mounting portion on the counterweight 8, and rather, the productivity is reduced as compared with the case where a conventional welding structure is formed. Can be raised.

In the above-described embodiment, the means for attaching the counterweight 8 to the rear cross plate 5 is a screw structure using the bolts 12. However, a hook structure using hooks, or a hook structure and a screw structure. You may change to the combination of. The fitting between the boss 11 and the concave portion 9 is not limited to a circular shape, and may be a square shape.

In addition, since the steering is performed by rotating the axle shaft 18 around the vertical axis via the steering shaft 16, the rear axle mounting portion is configured by the mounting boss portion 14 having the through hole 14a. Instead of this method, it is also possible to adopt a steering system in which the rear wheel 2 is attached to the axle shaft 18 via a steering knuckle so as to be rotatable, and the steering wheel is steered by a steering link. Axle mounting part is axle shaft 18
Can be fixed to the counter weight 8.

[0021]

As described in detail above, according to the present invention,
By attaching the counterweight to the frame end member and attaching the rear axle to the counterweight, the frame structure can be simplified, and the rearward extension of the counterweight can be suppressed or reduced. Therefore, it is possible to reduce the overall length of the vehicle and realize a more compact vehicle.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a frame structure, a counterweight mounting structure, a rear axle mounting structure, and the like.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is an overall side view of the small battery forklift.

FIG. 4 is an overall side view of a conventional small battery forklift.

5 is a cross-sectional view of a portion X in FIG. 4, showing a conventional rear axle mounting structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 3 ... Lower frame 5 ... Rear cross plate 8 ... Counter weight 12 ... Bolt 13 ... Space part for axle mounting 14 ... Mounting boss part 15 ... Rear axle 16 ... Steering shaft 18 ... Axle shaft

Claims (2)

[Claims] 1. A rear axle mounting structure for an industrial vehicle in which a counter weight is fixed to a frame end member constituting a rear end portion of a frame, and a rear axle is mounted on an axle mounting portion provided on the counter weight. 2. A plurality of bosses protruding rearward are provided on the frame end member, and a counter weight is fastened to a rear cross plate by a bolt in a state where a recess provided on the counter weight is fitted to the boss. The rear axle mounting structure according to claim 1.