JP2547567B2 - Car suspension equipment - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle suspension device, and more particularly to a suspension device using an H-shaped member such as a lower arm of a strut suspension as a suspension component. The present invention relates to a device capable of suitably controlling a change in toe angle due to elastic deformation.

(Prior Art) Some vehicle suspension devices have an H-shaped connecting member as a suspension component, as represented by a strut suspension. Japanese Patent Publication No. 62-9042 discloses an example of such a strut suspension. As disclosed in this publication, this type of suspension device
The main components are an H-shaped lower control arm and struts connected to the lower and upper ends of a knuckle arm that supports wheels.

(Problems to be Solved by the Invention) Here, as the toe-in characteristics of the suspension, it is desirable to shift to the toe-in side in order to ensure traveling stability during braking.

Therefore, an object of the present invention is to obtain a toe-in change due to elastic deformation of the suspension system at the time of braking with a simple structure in the one having an H-shaped connecting member as a suspension component.

(Means for Solving Problems) The configuration of the present invention will be described with reference to FIG. The suspension device of the present invention includes an H-shaped suspension arm 5 as a suspension constituent element for supporting the wheel 1 on the side 3 of the vehicle body, and the two arm portions 7 protruding toward the vehicle body side of this suspension arm. , 9 have a relative positional relationship in the longitudinal direction X of the vehicle body, and the arm portion 9 on the rear side of the vehicle body is inclined at an angle Θ toward the front side of the vehicle body with respect to the vehicle width direction Y so that the tip end thereof faces the front side of the vehicle body. are doing. Further, the arm portion 9 on the rear side of the vehicle body can be moved more easily in the front-rear direction of the vehicle body than the portion 7 on the other side. on the other hand,
The tips 7a and 9a of these arm portions are connected to the connecting members 11 and 13, respectively.
It is connected to the wheel 1 via. Here, these two connecting members 11 and 13 have different rigidity in the longitudinal direction of the vehicle body alternately, and the connecting member 13 connected to the arm portion 9 on the rear side of the vehicle body.
The rigidity of is high. The connecting member 13 on the higher rigidity side has a higher rigidity in the vehicle body front-rear direction than the arm portion 9.

The deformation of the suspension system of the present invention having the above-described structure during braking will be described. When the braking force F acts on the wheel 1 during braking, the wheel 1 moves relatively to the rear side of the vehicle body with respect to the arm 5. In this movement, the front end 7a on the front side of the vehicle body is connected to the connecting member having low rigidity, so that the arm member 7 is not displaced and the connecting member is deformed to move to the rear side of the vehicle body to reach the broken line position. On the other hand, the connecting member 13 on the rear side of the vehicle body
Since the rigidity is high, the arm portion 9 is displaced to the rear side of the vehicle body before the distal end 9a of the arm portion is displaced and the mounting position on the wheel side is displaced, and the state shown by the broken line is obtained. Due to this displacement, the distal end 9a of the arm portion 9 draws a locus substantially along the arc R centering on the base end 9b of the arm portion 9, so that the wheel side is closer to the original position shown by the solid line. Moving. As a result, the wheel 1 slightly rotates toward the front side of the vehicle body, and the toe-in tendency increases.

Here, the arm portion 9 on the rear side of the vehicle body, which is easily displaced in the vehicle body front-rear direction, can be formed of, for example, spring steel having a lower rigidity than other arm portions. Also,
This part may be formed from a member separate from the other part of the arm, and this member may be configured to be pin-joined to the arm so as to be rotatable in the front-rear direction of the vehicle body. Further, both arm portions may be made of spring steel, and the arm portion 9 on the rear side of the vehicle body may have low rigidity.

On the other hand, a rubber bush can be used as the connecting member, and a pillow ball can be used as the connecting member having high rigidity in the vehicle body front-rear direction.

The present invention can be applied to any suspension including a substantially H-shaped suspension arm connected to a wheel at two points, and typical examples thereof include a strut suspension and a Wishbon suspension. Can be raised.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 2 to 5. This example is a suspension for the right wheel in the rear suspension of a front-wheel drive vehicle, or a strut type suspension as shown in the figure.

First, as shown in FIGS. 2 and 3, the suspension 20 mainly includes an H-shaped lower control arm 22 and a strut 24. The arm 22 is arranged in the vehicle width direction between the wheel 26 and the cross member 28 of the vehicle body, and has a tapered shape toward the side of the wheel, and two arm portions projecting toward the wheel side of this arm. Of the arms 22a and 22b, particularly the arm portion 22b on the rear side of the vehicle body is inclined by a predetermined angle with respect to the vehicle width direction so that the tip end thereof faces the front side of the vehicle body. Bearing portions 22c and 22d are formed at the tips of the two arm portions 22a and 22b of the arm. On the side of the wheel 26, a spindle 32 is fixed at the lower end of the knuckle arm 30 in a substantially horizontal state toward the front-rear direction of the vehicle body.
2d is rotatably connected via rubber bushes 34 and 36. On the other hand, the bearing portion 22 is also attached to the tips of the two arm portions 22e and 22f protruding toward the vehicle body of the lower control arm 22.
g and 22h are formed, and these are rotatably supported by a spindle 38 attached to the cross member 28. The spindle 38 is arranged in parallel with the spindle 32.

The strut 24 is composed of a shock absorber having a coil spring 24a, the lower end of which is coupled to the upper end of the knuckle arm 30 by a coupling bolt, while the upper mount portion of the upper end thereof is pivotally coupled to the vehicle body side. ing.

4 and 5, the lower control arm 22 is enlarged and shown. This arm 22 is made of a steel plate, and among the arm portions protruding toward the wheel side, the arm portion 22b on the vehicle body rear side is the other arm portion 22j.
And a pin joint rotatably with respect to the arm portion 22j in the front-rear direction of the vehicle body. It is inclined in the front-rear direction of the vehicle body by an angle Θ.
As shown in FIG. 5, the base end 22k of the arm portion 22b is inserted into the arm body portion 22j at the pin joint portion of the arm portion 22b. It is rotatably connected by.

Here, bearing portions 22a, 22b on the wheel side of the arm 22 are provided.
And a rubber bush 34 arranged between the spindle 32 and the
36 has different rigidity in the front-rear direction of the vehicle body, and the bush 34 on the rear side of the vehicle body is set to have higher rigidity.

In the suspension of this example configured as described above, since the arm portion 22b on the rear side of the vehicle body is pin-joined to the arm body portion 22j, the vehicle body front-rear direction is larger than the other arm portion 22a and the bush 36. The rigidity is extremely low. Further, the bush 36 is higher in rigidity in the vehicle body front-rear direction than the other bush 34. Therefore, as described with reference to FIG. 1, the arm portion 22b on the rear side of the vehicle body is slightly moved around the pin joint portion due to the braking force applied to the wheels toward the rear side of the vehicle body during braking. Rotate to the rear side. As a result, the spindle 32, which is connected to the bearing portions 22c and 22d at the tips of the two arm portions 22a and 22b, rotates, and the wheels are on the toe-in side. When such a deformation occurs here, each bearing 22 with respect to the axis of the spindle 32.
The axes of c and 22d are slightly displaced, but this deviation is
It is absorbed by the deformation of 32 and 34 in the vehicle width direction.

Here, in the present embodiment, the rubber bushes 34, 36 are used in the connecting portion between the arm 22 and the wheel side, and the rigidity in the vehicle body front-rear direction is different from each other. The rigidity in the vehicle width direction orthogonal to each other can also be changed accordingly. That is, the rigidity in the vehicle width direction of the bush on the front side of the vehicle body, in which the rigidity of the front and rear direction of the vehicle body is set low, can be made lower than that of the bush on the rear side of the vehicle body. With this configuration, as shown in FIG. 6, when the lateral force F acts from the outer side to the inner side in the vehicle width direction at the time of turning, the number of wheels on the front side of the vehicle body connected by the soft bush increases more. Displaces inward in the vehicle width direction, increasing the toe-in tendency. Therefore, if this configuration is applied to, for example, the rear suspension, the wheel on the outer wheel side shifts to the toe-in side during turning, so that traveling stability during such turning can be secured.

(Effects of the Invention) As described above, the present invention relates to a suspension device including an H-shaped suspension arm, in which the arm portion on the rear side of the vehicle body out of the two arm portions projecting toward the wheel side of the arm is the front and rear of the vehicle body. In addition to making it easy to move in any direction,
Since the rigidity of the connecting member connecting the arm portion and the wheel in the front-back direction of the vehicle body is set to be high, and the arm portion is inclined at the front side of the vehicle body, the mechanical structure is not complicated. With a simple configuration, the wheels can be easily moved to the toe-in side during braking, and traveling stability can be ensured.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing a configuration of the present invention, FIG. 2 is a plan view showing a main part of a strut type suspension to which the present invention is applied, and FIG. 3 is a front view of the suspension shown in FIG. FIG. 4 is a side view, FIG. 4 is a plan view showing the lower control arm of FIG. 2, FIG. 5 is a side view showing the arm portion of the arm of FIG. 4 on the front side of the vehicle body, and FIG. 6 is the embodiment of FIG. It is explanatory drawing which shows the deformation | transformation at the time of lateral force action. 1 ... Wheels 3 ... Vehicle side 5 ... H-shaped suspension arm 7 ... Arm part on front side of car body 9 ... Arm part on rear side of car body 11 ... Bush (connecting member) 13 ... Bush (of rigidity) Connection member on the higher side) X …… Front-rear direction of the vehicle Y …… Car width direction

Claims (6)

(57) [Claims] 1. A suspension device having an H-shaped suspension arm as a suspension constituent element for supporting a wheel on the side of a vehicle body, wherein two arm portions projecting toward the vehicle body side of said suspension arm are in the vehicle longitudinal direction. The arm portion on the rear side of the vehicle body is inclined toward the front side of the vehicle body with respect to the vehicle width direction so that the tip of the arm portion on the rear side of the vehicle body faces the front side of the vehicle body. Is more easily movable in the front-rear direction of the vehicle body than the other arm portions, and the tips of the two arm portions are connected to the wheels via connecting members, respectively, and are connected to the arm portion on the rear side of the vehicle body. The rigidity of the connecting member in the vehicle body front-rear direction is set higher than that of the other connecting member, and the connecting member having high rigidity has a vehicle body front-rear direction compared to the arm portion on the vehicle body rear side. Automobile suspension apparatus characterized by rigidity is set high. 2. The vehicle suspension device according to claim 1, wherein the arm portion located on the rear side of the vehicle body is made of spring steel. 3. A suspension device for an automobile according to claim 1, wherein the arm portion located on the front side of the vehicle body is made of spring steel. 4. The device according to any one of claims 1 to 3, wherein at least one of the two connecting members having a lower rigidity is formed of a rubber bush. And suspension system for automobiles. 5. The suspension device for an automobile according to claim 4, wherein the connecting member on the high rigidity side is composed of a pillow ball. 6. The device according to claim 1, wherein the arm portion located on the rear side of the vehicle body is made of a member joined to the suspension arm by a pin so as to be rotatable in the vehicle longitudinal direction. A suspension system for automobiles featuring an eruct.