JPS6226107A - Roll steer compensation method for trailing arm type suspension - Google Patents

Abstract

PURPOSE:To make alteration in a steering trend so easy, by installing a bush, having such an elastic modulus as being different in each of horizontal and vertical directions, in a support part at the body side of a trailing arm free of rotation, and constituting this bush so as to be rotated. CONSTITUTION:A bush 8, consisting of an elastic body of rubber or the like and installing two port parts 9 face-to-face as holding the center in between, is attached to a setting part 7 at the body side of a trailing arm 5 free of rotation. In this bush 8, an elastic modulus toward the outside at the central part differs in each of directions of a one-dot chain line (a) and another one-dot chain line (b), so that this bush 8 is rotated whereby directional properties of the elastic modulus in the setting part of the trailing arm 5 are optionally alterable so that a steering trend is easily alterable.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention improves the roll steer characteristics of the suspension by rotating the bushing provided on the vehicle body side support portion of the trailing arm and changing the elastic direction of the bushing. The present invention relates to a roll steer correction method that changes the roll steer correction method.

<Prior Art> In general, some automobiles have a tendency to oversteer, in which the turning direction of the axle beam moves toward the center of turning, and others have a tendency to understeer, in which the direction of turning is directed outward. There is. In addition, there are models that do not exhibit oversteer or understeer tendencies, and these tendencies are determined by the car's suspension, load distribution, road surface conditions, etc., and each car has its own unique characteristics. This is what we are doing.

<Problems to be solved by the invention> It is difficult to say which of the above various tendencies that appear while driving a car is the best; it depends on the driving skills and preferences of the driver,
It is preferable that it can be changed depending on conditions such as traveling speed and road surface. However, until now there has been no such thing that could easily change the nutearing tendency of a car.

Means for Solving the Problems> Therefore, the present invention provides a trailing arm type having a structure in which one end of the trailing arm is supported on the vehicle body side and the other end is fixed to the axle beam to support the axle beam. In the suspension, a bushing having different modulus of elasticity in the longitudinal direction and the vertical direction is provided on the vehicle body side support portion of the trailing arm so as to be rotatable with respect to the support member, and the bushing is attached to the support member. By rotating the bushing, the directionality of the elasticity of this bushing changes, thereby changing the roll steer characteristics of the suspension.

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

Figure 2 shows the suspension that supports the rear wheels.

In the figure, rear wheels 3 and 4 are attached to the shaft end of the axle beam 2.
is rotatably mounted.

On the other hand, in the vehicle 1, the trailing arms 5 and 6 are mounted on the left and right sides with parts 7 provided at the rear of the vehicle L. It is rotatably mounted towards the The axle beam 2
are fixed to the rotating ends of these trailing arms 5 and 6 by welding or the like. The mounting portions of the mounting portions 7 of the trailing arms 5 and 6 are fitted with bushings 8 each having a hole 9 in a portion as shown in FIG. This bushing 8 is made of an elastic body made of rubber or the like, and has two holes 9 facing each other across the center, and the shaft of the mounting part 7 is passed through the center part. There is. Furthermore, P7'/U8 is the trailing arm 5 and 6.
It is designed to rotate around the center when it is fitted.

In other words, the bushing 8 is located outwardly at the center in the direction in which the hole 9 is provided. The elastic modulus is different. Furthermore, the orientation of the different elastic groups can be changed arbitrarily by rotating the bushing 8.

Next, the suspension action of the trailing arms 5 and 6 to which the bushings 8 described above are attached will be described. Taking as an example the case where the car is temporarily turned to the left, as shown in Figure 4, which shows the rear of the car body, the car body l leans to the right due to centrifugal force, causing twisting of the suspension. Looking at this from the suspension side, the trailing arm 5 on the right side rotates so as to be pulled toward the vehicle body 1,
Conversely, the left trailing arm 6 rotates away from the vehicle body. As shown in FIG. 2, the Acnull shaft 2 is tilted relative to the original position indicated by the two-dot chain line A, and the shaft end of the right trailing arm 5 is upward, and the shaft end of the left trailing arm 6 is tilted upward. This means that the shaft end has moved downward.

By twisting in this way, an upward reaction force P1 is applied to the end of the trailing arm 5 on the vehicle body 1 side, while a downward reaction force P2 is applied to the end of the trailing arm 6 on the vehicle body 1 side. arise.

Here, in order to make the steering tendency of the vehicle 1 oversteer, the bushings 8 attached to the trailing arms 5 and 6 are rotated, and the direction tabs of the bushings 8 having a low elastic modulus are set on the left and right dashed lines a. Both the bushings 8 may be set diagonally downward with respect to the front of the vehicle. By doing this, as described above, the bush 8 of the trailing arm 5 is compressed obliquely upward by the upward reaction force P□ received when turning left, and the trailing arm 5 is displaced rearward.

On the other hand, the bushing 8 of the trailing arm 6 provided on the left side is compressed diagonally downward and displaced forward. This is shown in Figure 3 from above, and is explained in the same figure.
The displacement of the trailing arms 5 and 6 as described above causes the axle beam 2 to tilt to the position shown by the two-dot chain line B. That is, if the rear wheels 3 and 4 turn to the right, a tendency for oversteer appears. Also, this oversteer tendency is such that when turning right, the left trailing arm 6 on the outer wheel side is displaced backwards, and the right trailing arm 5 on the inner wheel side is displaced forward, causing the rear wheels 3.4 to move forward. It appears by turning to the left.

On the other hand, by rotating the bushing 8, as shown in Fig. 1(b),
If the dot-dash line a of the bushing 8 is set diagonally upward and forward with respect to the vehicle body 1, a tendency for understeer will appear. This will be discussed below. As mentioned above, when turning left, an upward reaction force P is generated on the right trailing arm 5 due to suspension torsion. The bush 8 of the trailing arm 5 is compressed diagonally rearward by this reaction force P, and the trailing arm 5 is displaced rearward.

On the other hand, since the trailing arm 6 on the pressure side is displaced forward, the axle beam 2 is tilted as indicated by the two-dot chain line C in FIG. The rear wheels 3 and 4 turn to the left and a tendency to understeer appears. Further, when the bushing 8 is placed in the above state and turned to the right, the axle beam 2 tilts as indicated by the chain double-dashed line B in FIG. 3, and the vehicle body 1 tends to understeer.

In the above-mentioned embodiment, the direction of the elastic modulus of the bushing 8 is varied in the hole 9, but the present invention is not limited to this. Furthermore, if the rotation of the bushing 8 is driven by a wire or the like, the aforementioned steering tendency can be adjusted from within the vehicle interior.

<Effects of the Invention> As described above, according to the present invention, the main body layout of the trailing arm is achieved by rotating a bushing having a directionality in the elastic modulus provided in the part, thereby reducing the reaction during roll. By using force to move the trailing arm back and forth, it is possible to change the steering tendency when the vehicle rolls, such as oversteer or understeer.

[Brief explanation of the drawing]

Figures 1 to 4 are according to the present invention. Figure 1 is a side view showing the trailing arm, Figure 2 is an explanatory diagram illustrating the structure of the rear suspension, and Figure 3 is a plan view of Figure 2. FIG. 4 is an explanatory view showing the rear part of the vehicle. In the drawing, l is the vehicle body, 2 is the axle beam, 5.6 is the trailing arm, 7 is the support part, and 8 is the bushing.

Claims (1)

[Claims] In a trailing arm type suspension having a structure in which one end of the trailing arm is supported on the vehicle body side and the other end is fixed to an axle beam to support the axle beam, a support portion of the trailing arm on the vehicle body side is attached in the longitudinal direction. A bush having different modulus of elasticity in the upper and lower directions is rotatably provided with respect to the support member, and by rotating the bush with respect to the support member, the directionality of the elasticity of the bush is changed. A roll steer correction method for a trailing arm type suspension, characterized in that the roll steer characteristics of the suspension are changed.