JPH05112116A - Leaf suspension device - Google Patents

Abstract

PURPOSE:To prevent over-steering due to axle-steering in the case of rolling of a car body during cornering of the car. CONSTITUTION:Both ends of a rear axle 11 are connected to leaf springs 12 through U-bolts at the intermediate portions of the leaf springs 12 respectively, and the front and rear ends of the right and left leaf springs 12 are supported by sliding seats of sliding seat type spring brackets 18 and 19 respectively. And, stabilizers 20 made of torsion bars are rotatably supported by stabilizer brackets 21 of the rear axle 11, and in addition, the front ends of the arms 22, which are provided so as to bend forwards at the right and left sides of the stabilizers 20, are connected to the lower parts of the front spring brackets 18.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a leaf suspension device, and more particularly to a leaf suspension device in which an axle is suspended on a vehicle body by a leaf spring.

[0002]

2. Description of the Related Art As disclosed in, for example, Japanese Utility Model Laid-Open No. 61-134412, a suspension device in which an axle of an automobile is suspended from a vehicle body frame via a leaf spring has been widely used. The leaf suspension device is widely used in vehicles such as trucks because it has a simple structure, can withstand a large load, and has excellent durability.

[0003]

However, in the leaf suspension device, in which the leaf spring is connected to the rigid frame, the axle steering occurs when the vehicle body rolls during turning of the vehicle. Axle steering is a characteristic that the vehicle becomes oversteer because it is in the opposite direction to the steering direction of the front wheels.
That is, the roll steer characteristic is generated.

In order to prevent the above-mentioned axle steer, for example, as disclosed in Japanese Utility Model Laid-Open No. 61-134412, a stabilizer is attached to suppress the roll of the vehicle body. The stabilizer reduces the axle steering of the vehicle to some extent, so that the roll steering characteristic also deteriorates. However, oversteering by the leaf suspension system cannot be completely prevented.

In order to improve the roll steer characteristic and change from the over steer characteristic to the under steer characteristic, it is necessary to reduce the leaf camber or to lower the height of the spring bracket on the front side and raise it on the rear side. According to this arrangement of spring brackets,
Since the leaf springs are arranged obliquely, there is a problem that the antivibration effect is limited and the design is limited.

The present invention has been made in view of the above problems, and it is an object of the present invention to provide a leaf suspension device which improves the roll steer characteristic without changing the height of the spring bracket. It is intended.

[0007]

According to the present invention, in a leaf suspension device in which an axle is suspended on a vehicle body by a leaf spring, both ends of the axle are respectively connected to intermediate positions of left and right leaf springs, and the leaf is The front end and the rear end of the spring are received by a sliding seat type spring bracket, the middle part of the stabilizer comprising a torsion bar is connected to the axle, and the bending arms at both ends of the torsion bar are forward spring brackets. It is designed to be connected to the bottom of.

[0008]

When the vehicle body rolls when the vehicle turns, the leaf spring bends, and the front end and rear end of the leaf spring move on the sliding seat of the spring bracket. Then, the axle makes a rotational movement around the lower part of the spring bracket to which the torsion bar is connected. Therefore, it is possible to prevent the vehicle from oversteering without disposing the spring bracket at a low position.

[0009]

1 to 3 show a leaf suspension device for a truck according to an embodiment of the present invention. As shown in FIG. 3, a rear axle 11 having rear wheels 10 attached to both ends is As shown in FIGS. 1 and 2, the frame 13 is suspended via a leaf spring 12. At an intermediate position in the length direction of the leaf spring 12, via the U bolt 14 and the connecting plate 15,
Both ends of the rear axle 11 are attached to leaf springs 12.

The spring brackets 18 and 19 for receiving the front end portion and the rear end portion of the leaf spring 12, respectively, are of a sliding seat type, and slide on the front end side upper surface and the rear end side upper surface of the leaf spring 12, respectively. It consists of brackets that receive as much as possible.

The leaf suspension system further includes a stabilizer 20 which is a torsion bar.
The intermediate portion of the stabilizer 20 is supported by the rear axle 11 via a pair of left and right stabilizer brackets 21. The arms 22 on both end sides of the stabilizer 20 extend forward and are provided with connecting holes 30 at the tip end as shown in FIG. Then, as shown in FIG. 5, a pin 32 is pivotally attached to the connecting hole 30 and is connected to the connecting portion 23 via a bearing 31 of the lower connecting portion 23 of the front spring bracket 18.

As described above, in the leaf suspension device according to the present embodiment, the main spring 12 is attached to the frame 13 before and after the spring brackets 18, 19 provided with the pin 33 for preventing the spring 12 from slipping off.
It is done by. The front and rear spring brackets 18 and 19 are both sliding seat types. Therefore, the rear axle 11 cannot be positioned in the front-rear direction by these brackets 18 and 19, and the left-right front-rear position of the rear axle 11 is free.

That is, in order to position the rear axle 11 in the front-rear direction, the stabilizer 20 composed of a torsion bar is attached to the front spring bracket 18 and the rear axle 1.
The first stabilizer bracket 21 rotatably supports the rear axle 11 around an axis parallel to the axis of the rear axle 11, and the stabilizer 20 serves as a trailing arm to position the rear axle 11.

Therefore, when the vehicle body rolls when the vehicle turns, the rear axle 11 is displaced along with the deformation of the leaf spring 12. Rear axle 1 when rolling
The center of the rotation trajectory of 1 is the front spring bracket 1
It becomes a connecting portion 23 with the stabilizer 20 on the lower end side of 8.
That is, since the center of the axle track is located below,
The roll steer characteristic is improved to the under steer characteristic. In addition, the stabilizer 20 can improve the roll rigidity. Therefore, with such a stabilizer 20, the roll steer characteristic of the leaf suspension device can be made an under steer characteristic.
Therefore, even if the vehicle body rolls when the vehicle turns and the axle 11 steers, the vehicle does not oversteer.

[0015]

As described above, according to the present invention, both ends of the axle are connected to the intermediate positions of the left and right leaf springs, respectively, and the front end and the rear end of the leaf spring are received by the sliding seat type spring bracket. The intermediate portion of the stabilizer composed of the torsion bar is connected to the axle, and the bent arms at both ends of the torsion bar are connected to the lower portion of the front spring bracket. Therefore, the center of the locus when the axle steers along with the rolling of the vehicle body when the vehicle turns is the lower portion of the front spring bracket and the connecting portion with the torsion bar. As a result, the roll steer characteristic can be improved to the under steer side, and oversteer at the time of turning of the vehicle can be prevented.

[Brief description of drawings]

FIG. 1 is a perspective view of a main part of a leaf suspension device according to an embodiment of the present invention.

FIG. 2 is a side view of the leaf suspension device.

FIG. 3 is a plan view of the leaf suspension device.

FIG. 4 is a side view of a tip end portion of an arm of a stabilizer.

FIG. 5 is a vertical cross-sectional view showing the structure of connection between a stabilizer and a spring bracket.

[Explanation of symbols]

 10 Rear Wheel 11 Rear Axle 12 Leaf Spring 13 Frame 14 U Bolt 15 Connecting Plate 18 Spring Bracket (Front) 19 Spring Bracket (Rear) 20 Stabilizer 21 Stabilizer Bracket 22 Arm 23 Connecting Portion 30 Connecting Hole 31 Bearing 32 Pin 33 Pin for Preventing Displacement

Claims (1)

[Claims] 1. A leaf suspension device in which an axle is suspended from a vehicle body by a leaf spring, wherein both ends of the axle are connected to intermediate positions of left and right leaf springs, respectively, and a front end portion and a rear end portion of the leaf spring are connected. Is supported by a sliding seat type spring bracket, the middle part of the stabilizer consisting of a torsion bar is connected to the axle, and the bending arms at both ends of the torsion bar are connected to the lower part of the front spring bracket. A leaf suspension device characterized in that