JP2591183Y2 - Axle telescopic suspension - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an axle telescopic suspension system suitable for suspension of wheels such as a trailer, and more particularly to a tandem axle type axle telescopic suspension system having an equalizer between front and rear leaf springs.

[0002]

2. Description of the Related Art A vehicle, especially a new vehicle, is transported by a vehicle transporter to prevent accidents and injuries caused by self-propelled vehicles. In order to transport a large number of vehicles, a semi-tractor has a two-stage deck. Connected vehicle transport trailers are also used. In a vehicle transport trailer, it is desirable to lower the lower loading floor surface as much as possible in order to enhance the stability at the time of high-speed running and to reduce the overall height. Therefore, JP
In Japanese Patent Application Publication No. 3-43802, a vehicle transport trailer having an axle expansion / contraction mechanism is proposed. In this trailer,
During loading, the wheels are moved outside the vehicle body after jacking up the chassis frame to avoid interference between the loaded vehicle and the wheels. In addition, the wheels are returned to their original positions so as to be within the predetermined vehicle width during traveling. Furthermore, in this example, the center of the axle is offset downward, and the height of the loading floor is lower than the center axis of the wheels.

[0003] The above-mentioned trailer has a single axle, and there is a limit to the loading weight (ie, the number of loaded vehicles). In view of this, as shown in FIG. 10, a semi-trailer 2 connected to the semi-tractor 1 may be a tandem axle having two front and rear axles so that a heavy truck 3 or the like can be loaded. In the tandem axle, front and rear axles 4 and 5 are suspended on a chassis frame 8 via independent leaf springs 6 and 7. For this reason, generally, an equal load is applied to each of the axles 4 and 5 when climbing over a step or the like, as disclosed in JP-A-57-99404 and JP-A-57-99404.
An equalizer mechanism as described in JP-A-99405 is often used.

[0004]

[Problems to be Solved by the Invention] When an equalizer mechanism is employed in a suspension device having an axle expansion / contraction mechanism, there are the following problems. The equalizer mechanism transmits the load acting on one leaf spring to the other leaf spring and averages the load.The equalizer mechanism swings the leaf springs of the front and rear axles through an equalizer supported swingably on the chassis frame. Connected. Therefore, Japanese Patent Application Laid-Open No. 57-994
No. 04 and Japanese Patent Application Laid-Open No. 57-99405,
In the case where the front and rear leaf springs and the equalizer are connected by a pin connection or a bayonet connection, it is necessary to move the equalizer at the same time when the axle expands and contracts. However, in such a configuration, the equalizer must be mounted on the chassis frame so as to be slidable in the left-right direction, and there is a disadvantage that the structure of the bearing and the slide mechanism is complicated. Further, if the expansion and contraction operations of the front and rear axles are not completely synchronized, bending stress is generated in the leaf spring and the equalizer, which may be damaged.

For this reason, the conventional telescopic axle type tandem axle does not employ an equalizer mechanism.
FIG. 12 (viewed in the direction of arrow A in FIG. 11) and FIG.
As shown in an arrow view), the front and rear telescopic axles 9 and 10 are independently disposed below the chassis frame 8. Accordingly, it is inevitable that the tire 11 slides or sets the leaf springs 6 and 7 due to the unevenness of the road surface or the deflection of the chassis frame 8 during running. In the drawings, reference numerals 12 and 13 denote a guide shaft and a movable shaft, and reference numeral 14 denotes a cylinder device that expands and contracts the movable shaft 13 in the left-right direction.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide an axle telescopic suspension device which solves the above-mentioned problems of the prior art and which can apply an axle telescopic mechanism to a suspension device having an equalizer mechanism with a simple structure. And

[0007]

In order to achieve the above object, an axle telescopic suspension device of the present invention comprises a guide shaft movably arranged vertically below a chassis frame, and slides on both ends of the guide shaft. A movable shaft that is freely fitted and has a wheel rotatably attached to a free end side, a pair of left and right leaf springs interposed between the movable shaft and the chassis frame, and the movable shaft. An axle telescopic suspension device comprising a plurality of telescopic axles, each of which comprises a set of telescopic axles in the front-rear direction, comprising an axle telescopic device that moves in the left-right direction together with a leaf spring. An equalizer that is attached and has an opening into which the end of the leaf spring fits in the lower surface of the front and rear ends, and an intervening member disposed between the chassis frame and the equalizer. A pair of front and rear springs for urging the equalizer to a horizontal position, and a guide member extending in the left-right direction below the front and rear ends of the leaf spring and guiding the movement of the leaf spring. It is a feature.

[0008]

According to the present invention, when the chassis frame is jacked up, the front and rear leaf springs relatively lower and separate from the equalizer. When the front and rear axles are extended in this state, the front and rear leaf springs are guided and moved by the guide members. At this time, since the equalizer is urged to the horizontal position by the spring, interference between the equalizer and the end of the leaf spring is prevented.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a semi-trailer for transporting a vehicle to which an axle telescopic suspension device according to the present invention is applied will be described below.
This will be described with reference to the accompanying drawings. As shown in FIGS. 1 and 2 (viewed in the direction of arrow C in FIG. 1), the semi-trailer 2 of this embodiment
In the figure, two sets of front and rear telescopic axles 9 and 10 are disposed below the chassis frame 8. These telescopic axles 9, 10
A guide shaft 12 movably arranged up and down on a chassis frame 8 via upper and lower radius rods 15 and 16, and a movable shaft slidably fitted to both ends of the guide shaft 12, similarly to the above-described conventional device. 13, leaf springs 6, 7 fixed to the movable shaft 13, and a cylinder device 14 for moving the movable shaft 13 in the left-right direction.

However, in this embodiment, unlike the conventional device, the leaf spring 6 of the front telescopic axle 9 and the leaf spring 7 of the rear telescopic axle 10 are equalized by an equalizer 17.
Are connected via As shown in FIG. 3 (enlarged view of a part D in FIG. 1), FIG. 4 (sectional view taken along the line EE in FIG. 3), and FIG. 5 (sectional view taken along the line FF in FIG. 3), It is swingably attached via a pin 20 to an equalizer bracket 19 fixed to a lower surface of a cross member 18 constituting the chassis frame 8. The shape of the equalizer 17 is a substantially U-shaped cross section opened at the bottom, and its opening 17a is formed.
Ends of the front and rear leaf springs 6 and 7 are fitted to the front and rear ends. In FIG. 5, a roller 21 is rotatably mounted in the opening 17a of the equalizer 17, and rolls in contact with the oscillating leaf springs 6, 7. Reference numerals 22 and 23 denote sliding plates attached to the left and right inner side surfaces of the equalizer 17, respectively, which are in sliding contact with a swinging leaf spring.

A pair of front and rear spring brackets 25 are mounted on the upper surface of the equalizer 17, and a pair of front and rear spring brackets 26 are also mounted on the lower surface of the road plate 24 fixed to the chassis frame 8. A coil spring 27 is interposed between the spring brackets 25 and 26, respectively, and the spring force urges the equalizer 17 to be in a horizontal state.
The spring force of both coil springs 27 is much smaller than the spring force of leaf springs 6 and 7, and does not hinder the swing of equalizer 17 during traveling.

On the other hand, a hydraulic jack 29 provided with a grounding leg 28 which extends and contracts downward is attached to the left and right ends of the cross member 18. Also, cross member 1
The front and rear end surfaces of the guide rod brackets 31 and 32 are respectively formed on the left and right end portions and the portion inside the equalizer 17 via L-shaped brackets 30 on the front and rear end surfaces.
Is installed. Both guide rod brackets 31,
A guide rod 33 made of steel pipe, which is a guide member, extends horizontally at the lower end of the leaf spring 32.
The end of 7 is guided on its upper surface.
In FIG. 5, reference numeral 34 denotes a spring stopper fixed to the bracket 30 and the guide rod bracket 31. Further, as shown in FIG. 2, the cross members 35, 3 before and after supporting the front and rear ends of the leaf springs 6, 7, respectively.
6, a guide rod 37 extends horizontally, and the front end of the leaf spring 6 and the leaf spring 7
The rear end is guided.

The operation of this embodiment will be described below. In the semi-trailer 2 of the present embodiment, when one of the front and rear tires 11 climbs over a step during traveling, the equalizer 17 swings, and the load acting on one leaf spring 6 (7) increases the load on the other leaf spring 6 (7). The power is transmitted to the spring 7 (6). As a result, a uniform load is applied to both telescopic axles 9 and 10, and, unlike the conventional one without an equalizer, the sliding of the tire 11 and the set of the leaf springs 6 and 7 are prevented.

On the other hand, when an automobile is loaded on the semi-trailer 2, the grounding leg 28 of the jack 29 is first extended downward as shown in FIGS. 6 and 7 (a sectional view taken along line GG in FIG. 6). Then, the chassis frame 8 is lifted until the tire 11 floats. Then, the front and rear telescopic axles 9 and 10 are relatively lowered with respect to the chassis frame 8, and the ends of the leaf springs 6 and 7 are disengaged from the opening 17 a of the equalizer 17 and come into contact with the upper surface of the guide pipe 33.

Next, when the cylinder device 14 is extended,
The tire 11 moves outward together with the movable shaft 13 (not shown), and the leaf springs 6 and 7 also move outward by being guided by the guide pipe 33 as shown in FIG. On this occasion,
As described above, since the equalizer 17 is maintained in a horizontal state by the spring force of the front and rear coil springs 27, the leaf springs 6 and 7 do not interfere with the equalizer 17.

Next, as shown in FIG.
When the grounding leg 28 is shortened, the front and rear telescopic axles 9, 10
Rises relatively to the chassis frame 8. Then, the ends of the leaf springs 6 and 7 are
And comes into contact with the lower surface of the spring stopper 34.
As a result, the ground height of the semi-trailer 2 decreases, and the loading of the vehicle can be easily performed.

When the loading of the car is completed, the jack 29
After the grounding leg 28 is extended again, the cylinder device 14 is shortened, and the leaf springs 6, 7
And the equalizer 17 are fitted.

[0018]

As is apparent from the above description, according to the present invention, an axle telescopic trailer that can be easily loaded with an automobile can be used as a tandem axle with an equalizer, which can increase the loaded weight. In addition, it is possible to prevent the tire from slipping or from slipping on the leaf spring.

[Brief description of the drawings]

FIG. 1 is a side view showing a main part of an embodiment of a semi-trailer employing an axle telescopic suspension device according to the present invention.

FIG. 2 is a view taken in the direction of arrow C in FIG. 1;

FIG. 3 is an enlarged view of a D part in FIG. 1;

FIG. 4 is a sectional view taken along line EE in FIG. 3;

FIG. 5 is a sectional view taken along line FF in FIG. 3;

FIG. 6 is a side view showing a state where a jack is extended in the embodiment.

FIG. 7 is a sectional view taken along the line GG in FIG. 6;

FIG. 8 is a rear view showing a state where the axle is extended in the embodiment.

FIG. 9 is a rear view showing a state where the jack is shortened in the embodiment.

FIG. 10 is a side view showing a semi-trailer for transporting a vehicle towed by a semi-tractor.

FIG. 11 is a side view showing a main part of a semi-trailer employing a conventional axle telescopic suspension device.

FIG. 12 is a view taken in the direction of arrow A in FIG. 11;

FIG. 13 is a view taken in the direction of arrow B in FIG. 11;

[Explanation of symbols]

 6,7 leaf spring 8 chassis frame 9,10 telescopic axle 11 wheel 12 guide shaft 13 movable shaft 14 cylinder device 17 equalizer 18 cross member 27 coil spring 29 jack 33 guide rod

Claims (1)

(57) [Scope of request for utility model registration] A guide shaft (12) movably arranged vertically below a chassis frame (8), and a guide shaft (1).
2) a movable shaft (13) slidably fitted to both ends and a wheel (11) rotatably mounted on the free end side;
A pair of left and right leaf springs (6, 6) interposed between the movable shaft (13) and the chassis frame (8).
7) and a plurality of sets of telescopic axles (9, 10) in the front-rear direction, each of which comprises an axle telescopic device (14) for moving the movable shaft (13) in the left-right direction together with the leaf springs (6, 7). An axle telescopic suspension device comprising: an axle telescopic suspension device, which is attached to both sides of the chassis frame (8) so as to be swingable, and the ends of the leaf springs (6, 7) fit into lower surfaces of front and rear ends. Opening (17
a) formed with a pair of front and rear springs (27) interposed between the chassis frame (8) and the equalizer (17) to urge the equalizer (17) to a horizontal position. ) And a guide member (33) that extends in the left-right direction below the front and rear ends of the leaf springs (6, 7) and guides the leaf springs (6, 7) when moving. Characteristic axle telescopic suspension system.