JP2521558Y2 - Structure of tandem axle load sensing valve link - Google Patents

Description

[Detailed description of the device]

[0001]

TECHNICAL FIELD The present invention relates to improvement of a working link of a load sensing valve for a tandem axle.

[0002]

2. Description of the Related Art When a load sensing valve is applied to a vehicle equipped with a tandem axle, as shown in FIGS. 3 to 5, all of these prior arts connect a front axle and a rear axle of a tandem axle. There is known a technique in which a rod 20 supported by a rubber 24 and a rod 21 connected to the rod 20 via a damper 22 are provided, and the rod 21 is connected to a lever of a load sensing valve 23 for printing.

[0003]

However, in the above method, the mule 24 supporting the rod 20 is unduly deformed by the seesaw movement of the front-rear axis that occurs when passing through a swell or a step. Further, when traveling on a rough road, the damper 22 and the rod 21 make a violent and complicated relative movement. Therefore, there is a problem that the durability of the connecting portion cannot be ensured.

An object of the present invention is to provide a load sensing valve link of a tandem axle which is free from excessive deformation and relative movement of the rod connecting portion and has excellent durability.

[0005]

According to the present invention, one end is pivotally attached to a side rail of a frame and the other end is movably connected to a front axle housing of a tandem axle so as to follow the movement of the front axle housing. And a second lever having one end pivotally attached to the side rail and the other end movably connected to the rear shaft housing so as to follow the movement of the rear shaft housing of the tandem axle. And
A connecting rod pivotally connected to the central portion of the first lever and a central portion of the second lever, and an input means for inputting to the load sensing valve are provided in the central portion of the connecting rod. .

The input means for inputting to the load sensing valve is preferably composed of a lever provided with a ball joint. Further, the first and second levers may be pivotally supported, and the connecting rod may be configured to extend and contract.

[0007]

[Explanation of Action and Effect] In the structure of the load sensing valve link of the tandem axle configured as described above, if the axial load of the front shaft and the rear shaft is increased, the first lever and the second lever are moved to the frame side. , Ie pivoted upwards and thus the connecting rod moved upwards, the lever of the sensing valve is actuated in the direction of increasing the braking force. Further, if the axle weights of the front axle and the rear axle are reduced, the braking force is reduced by the action opposite to the above. Also,
When the anteroposterior axis makes a seesaw movement on a bad road or the like, since the connecting rod also follows the seesaw movement, the lever of the sensing valve hardly rotates and the braking force hardly changes. And, the connecting portion of the lever and the rod is configured to be pivotable,
The first lever and the front shaft are movably connected to each other, and the second lever and the rear shaft are movably connected to each other.

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

1 and 2, a load sensing valve 2, a first lever bracket 5, and a second lever bracket 6 are provided on a side rail 1 of a vehicle frame.
And are fixed. Further, the first lever 3 is attached to the first lever bracket 5, and the second lever 4 is attached to the second lever bracket 6, respectively.
And is urged upward by the return springs 7 and 8, respectively. A connecting rod 10 is rotatably provided at the central portions of the first lever 3 and the second lever 4 via ball joints 9, respectively. Then, the tip portion 1 of the first lever 3
3 and the wire bracket 11 fixed to the front shaft housing 17 are connected by the wire 15, and the tip portion 14 of the second lever 4 is connected by the wire bracket 12 and the wire 16. Further, the connecting rod 10 is connected to a lever 19 of the load sensing valve 2 via a ball joint 9 fixedly provided in the central portion.

Therefore, as the axial load of the vehicle increases, the vertical relative positions of the front shaft housing 17 and the rear shaft housing 18 with respect to the side rail 1 become closer. Then, the first lever 3 and the second lever 4 are pivoted upward by the action of the return springs 7 and 8, the connecting rod 10 is moved upward, and the lever 19 of the load sensing valve 2 is The braking force is actuated in an increasing direction. Further, when the axial load is reduced, the side rail 1 and the front-rear shaft are relatively far apart, and the first lever 3 and the second lever 4 are connected to the wires 15, 1.
6 and pivots downward, the connecting rod 10 moves downward, and the lever 19 of the load sensing valve is actuated in the direction in which the braking force is reduced. Further, when the front-rear axis makes a seesaw movement on a bad road or the like, the connecting rod 10 also makes a seesaw movement, so that the input to the load sensing valve 2 is small.

Further, instead of connecting the lever bracket to the first lever and the second lever with a ball joint,
It is also possible to make the connecting rod extendable and contractible by using pins and bushes.

[0012]

[Effects of the Invention] Since the present invention is configured as described above, there is no unreasonable relative movement at the connection part between the lever and the lot, and pushing up from the front-rear shaft housing is also prevented by the wire, so durability, Excellent reliability.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram showing an embodiment of the present invention.

FIG. 2 is a view on arrow A in FIG.

FIG. 3 is an overall configuration diagram showing a conventional technique.

FIG. 4 is an overall configuration diagram showing a conventional technique.

FIG. 5 is an overall configuration diagram showing a conventional technique.

[Explanation of symbols]

 2 ... Load sensing valve 3 ... 1st lever 4 ... 2nd lever 5 ... 1st lever bracket 6 ... 2nd lever bracket 10 ... Connection rod 11 ... -Wire bracket 12 ... Wire bracket 17 ... Front shaft housing 18 ... Rear shaft housing 20 ... Rod 21 ... Rod

Claims (1)

(57) [Scope of utility model registration request] 1. A first lever, one end of which is pivotally attached to a side rail of a frame, and the other end of which is movably connected to the front shaft housing of the tandem axle so as to follow the movement of the front shaft housing; A second lever pivotally attached to the side rail and movably connected to the rear shaft housing so that the other end follows the movement of the rear shaft housing of the tandem axle. The central part,
A load sensing valve for a tandem axle, characterized in that a connecting rod pivotally connected to the center of the second lever and an input means for inputting to the load sensing valve are provided in the center of the connecting rod. Link structure.