JPS6238411Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a rear axle in an industrial vehicle such as a forklift truck, and its purpose is to make the swing amount adjustable in a rear axle support mechanism using a center pivot system. This is the purpose.

In industrial vehicles such as forklift trucks, a center pivot system is generally used as a mechanism for supporting the rear axle.

The center pivot system is a rear axle support that is fixedly installed on the vehicle body, and a center pin that projects on the vehicle centerline of the rear axle that supports the rear axle is placed between the top surface of the rear axle and the horizontal plate of the rear axle support. A support mechanism that allows the rear wheel side to swing in both left and right width directions about the pin with respect to the vehicle body by supporting the rear wheel with an appropriate clearance.

However, in the case of a support mechanism that allows the wheel side to swing through the clearance formed between the rear axle and the rear axle support as described above, it is difficult to handle shocks such as thrusting up from the wheel side, vibrations, and centrifugal force during turning. On the other hand, when lifting a cargo to a high position during lifting work on a forklift truck, or when working on a slope, the weight of the cargo may be In cases where it is biased towards one side, etc.
This may cause problems such as loss of stability.

Therefore, it is desirable to adjust the swing amount as appropriate in accordance with the working environment (for example, unevenness of the road surface, sloping condition) and the working mode (for example, the type of cargo, lifting height), etc.

Conventional mechanisms for adjusting the swing amount include a method in which abutment stops are provided protruding from the upper surface of the rear axle side in correspondence with both ends of the rear axle support, and the clearance is adjusted by the abutment stops; Screw the adjustment bolt so that it can move up and down in correspondence with the
A method has been proposed in which the clearance is adjusted using the same bolt (Utility Model Application No. 54-76123), but in the above method, the abutting stop is a fixed protrusion, so the clearance is made uniform on the left and right sides. The disadvantage is that it is extremely difficult to obtain the same condition, and since the clearance obtained by the stopper is constant, it is not possible to adjust the clearance at any time according to the work environment and work style. have In addition, in the above method, the weight of the load is directly applied to the threaded part of the adjustment bolt, which tends to cause damage or breakage of the threaded part, and the adjustment bolt is placed under the rear axle support. Difficult to adjust due to built-in
The disadvantage is that it is difficult to obtain fine adjustment, and once fine adjustment is obtained, deviations are likely to occur due to vibrations of the aircraft body, etc.

The present invention is an attempt to improve the above-mentioned conventional situation by providing a wedge-shaped slider on the rear axle side in correspondence with both widthwise ends of the rear axle support so that it can move forward and backward. , the feature is that the clearance can be adjusted steplessly.

In other words, the present invention supports the rear axle, which supports the wheels at both ends in the width direction, so that it can swing freely, with an appropriate clearance between the rear axle support and the rear axle support, which is fixed to the main frame. In the rear axle support mechanism, a U-shaped guide frame is fixed to the upper surface of the rear axle facing both ends of the horizontal plate in the vehicle width direction, and the guide frame has an inclined surface and is wedge-shaped. A pair of left and right sliders are provided on the rear axle so that the sliders are movable forward and backward on the rear axle so that the inclined surfaces thereof face both ends of the rear axle support in the width direction, and an adjustment bolt is rotatably inserted into the guide frame. The gist thereof is that the threaded portion of the adjusting bolt is configured to be screwed into the rear surface of the slider.

Hereinafter, specific embodiments of the present invention will be described with reference to the illustrative drawings.

In the drawings shown in FIGS. 1 and 2, 1 indicates a main frame constituting a vehicle body, 2 indicates a balance weight, 3 indicates a rear axle support, and 4 indicates a rear axle. The rear axle support 3 includes a horizontal plate 3a extending from the main frame 1 toward the balance weight 2, and a pair of front and rear vertical plates 3b, 3b hanging downward from both the front and rear ends of the horizontal plate 3a. The side surface shape is formed into a gate shape, and a pair of front and rear bearing portions 5, 5 are formed at the lower end portions of both vertical plates 3b, 3b along the vehicle center line.

On the other hand, the rear axle 4 has a top plate 4a, an under plate 4b, and both upper and lower plates 4a, 4b.
A pair of front and rear connecting plates 4c, 4c connecting the two at the center, and both upper and lower plates 4.
It consists of a pair of left and right reinforcing plates 4d, 4d that connect the left and right ends of the connecting plates 4c, 4b, and a pair of front and rear support pins 6, 6 are provided at positions corresponding to the vehicle center line on the connecting plates 4c, 4c.
protrudes in the front-rear direction.

The support pins 6, 6 are pivotally supported by the bearing portions 5, 5, and the rear axle 4 is swingably supported about the support pins 6, 6 as fulcrums. More specifically, it is supported with a slight clearance S between the top plate 4a and the horizontal plate 3a of the rear axle support 3.

The rear axle 4 has rear wheels 7, 7 at both ends thereof.
is rotatably mounted on an axis. The top plate 4a has a swing amount adjustment mechanism A according to the present invention.
A pair are provided at positions corresponding to both ends of the horizontal plate 3a in the vehicle width direction. The adjustment mechanism A is composed of a guide frame 8 fixed to the top plate 4a and a slider 9 provided so as to be movable forward and backward along the guide frame 8. The guide frame 8 includes a stopper plate 8a, a pair of front and rear guide plates 8b,
8b is formed in a U-shape, and its openings are provided toward both end edges of the horizontal plate 3a. That is, the pair of left and right guide frames 8, 8 are provided so that their openings face each other. An adjuster bolt 10 is freely rotatably fitted into the stopper plate 8a. A stopper plate 8a is disposed between the head of the adjuster bolt 10, and a flange 15 is provided on the inside of the head so as to abut against the inner wall surface of the stopper plate 8a, while on the outside of the stopper plate 8a. is asian nut 1
6 is provided so as to be able to rotate together with the adjusting bolt 10 via a spring pin 17.

On the other hand, the sliders 9, 9 are formed with a flat part 9a at one end in the width direction and a wedge-shaped part 9b at the other end, and a long hole 11 is opened in the flat part 9a. A lock bolt 12 which is screwed onto the top plate 4a is inserted through the elongated hole 11 so as to be able to tighten the flat portion 9a.

Further, an inclined surface 13 is formed on the front surface of the wedge-shaped portion 9b so as to correspond to both edges of the horizontal plate 3a. The inclined surface 13 is formed with an arbitrary slope. Further, a screw hole 14 is formed in the rear surface of the wedge-shaped portion 9b, and the adjusting bolt 10 is screwed into the screw hole 14.

Next, its effect will be explained.

FIG. 6 shows a state in which the adjustment mechanism A is set with a clearance S, that is, the pair of left and right sliders 9 are arranged between the inclined surfaces 13, 13 formed on the wedge-shaped portions 9b, 9b, and the horizontal plate 3a. It is shown in a state where it is fixed on the top plate 4a with an appropriate clearance S between it and both edges in the width direction.
In this set state, the effect of regulating the swing amount within the range of the above-mentioned clearance S can be obtained. Therefore, the adjustment mechanism A according to the present invention can change the clearance S at any time in response to changes in the working environment and working manner. The adjustment is achieved by moving the sliders 9, 9 forward and backward. The adjustment operation is as follows.

First, loosen the lock bolts 12, 12. By loosening the lock bolts 12, 12 and releasing their tightened state, a state is obtained in which the sliders 9, 9 can freely move forward and backward along the guide plates 8b, 8b.

In this state that the sliders 9, 9 can move forward and backward, next adjust the adjusting bolts 10, 1.
Rotate 0. The adjustment bolts 10, 10 can be rotated by rotating the adjustment nuts 16, 16 using a tool such as a spanner, for example. Then, by rotating the adjusting bolts 10, 10, the adjusting bolt 1
Male screw parts 10', 10' carved in the screw holes 14, 10, and female screw parts 14', 14 carved in the screw holes 14, 14.
The sliders 9, 9 move forward and backward along the guide plates 8b, 8b through the screwing action of the sliders 4'. By moving the sliders 9 and 9 back and forth, it is possible to adjust the clearance S formed between the opposite edges of the horizontal plate 3a in the width direction and the inclined surfaces 13 to a desired width. Then, in a state where a clearance S of an arbitrary width dimension is obtained, the lock bolt 1
By tightening 2 and 12, the set state is obtained. The other adjustment mechanism is operated in the same manner to make both clearances S the same.

The sliders 9, 9 are advanced to a position where their inclined surfaces 13, 13 abut against both edges in the width direction of the horizontal plate 3a, as shown by the two-dot chain line in FIG. By fixing the sliders 9, 9 on the top plate 4a by tightening the lock bolts 12, 12 in a state where the inclined surfaces 13, 13 are in contact with both edges in the width direction, a set state in which the clearance S is zero is achieved. can be obtained.

The present invention is constructed as described above.
As described above, the pair of left and right wedge-shaped sliders with inclined surfaces are provided on the rear axle so that they can move forward and backward so that the inclined surfaces face both edges of the rear axle support in the width direction. The clearance formed between both ends of the rear axle support in the width direction and the inclined surface can be changed steplessly by moving forward and backward, and the inclined surface is brought into contact with both ends of the rear axle support in the width direction. This made it possible to obtain a state with zero clearance, that is, a locked state.

As mentioned above, by making it possible to change the clearance steplessly and to obtain a locked state, it is possible to easily adjust the swing amount to the left or right, and also to adapt to changes in the work environment and work style. Correspondingly, it has become possible to adjust the swing amount arbitrarily.

In particular, in the case of the present invention, the amount of swing is adjusted by moving the slider forward and backward toward both ends of the horizontal plate in the vehicle width direction via the adjuster bolt, making this work easy. In addition to being able to make fine adjustments without causing any deviations due to vibrations of the aircraft, etc.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a rear axle support part equipped with a swing amount adjustment mechanism according to the present invention, FIG. 2 is an enlarged view of the same, FIG. 3 is an enlarged perspective view of a rear axle equipped with a swing amount adjustment mechanism, and FIG. The figure is an enlarged perspective view of the adjustment mechanism, FIG. 5 is a plan view thereof, and FIG. 6 is a side view thereof. A... Adjustment mechanism, 1... Main frame, 2...
... Balance weight, 3 ... Rear axle support, 3a ... Horizontal plate, 3b ... Vertical plate, 4 ... Rear axle, 4a ... Top plate, 4b ... Under plate, 4c ... Connection plate, 4d ... Reinforcement plate , 5... Bearing part, 6... Support pin, 7... Rear wheel, 8...
Guide frame, 8a...stopper plate, 8b...
...Guide plate, 9...Slider, 9a...
Flat part, 9b... Wedge-shaped part, 10... Adjustment bolt, 10'... Male thread part, 11... Long hole, 12
... Lock bolt, 13 ... Inclined surface, 14 ... Threaded hole, 14' ... Female thread part, 15 ... Flange,
16... Adjustment nut, 17... Spring pin.

Claims (1)

[Scope of utility model registration request] With respect to the rear axle support that is fixed to the main frame, the rear axle that supports the wheels at both ends in the vehicle width direction is pivoted with an appropriate clearance between the top surface of the rear axle and the horizontal plate of the rear axle support. In the rear axle support mechanism that supports the rear axle in a swingable manner, a guide frame is fixed to the upper surface of the rear axle facing both ends of the horizontal plate in the vehicle width direction, and the guide frame has an inclined surface. A wedge-shaped slider is provided on the rear axle so that the slider can move forward and backward so that the inclined surface thereof faces both ends of the horizontal plate in the vehicle width direction, and an adjustment bolt is rotatably inserted into the guide frame. , a swing amount adjustment mechanism of a rear axle support portion in an industrial vehicle such as a forklift truck, which comprises a threaded portion of the adjuster bolt screwed into the rear surface of the slider.