JPS6010166Y2 - Automotive wheel suspension system - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to an automobile wheel suspension system.

An automobile wheel suspension system has a suspension arm attached to a vehicle body member so as to be able to swing up and down, and a spring is interposed between the suspension arm and the vehicle body to elastically support the vertical movement of the wheel. Usually, a helper made of an elastic material such as rubber is provided, and the helper is compressed when it hits the vehicle body member during a bump, thereby making the spring characteristics non-linear as shown in Figure 3A (for example, Utsukai Showa 54-
(See Publication No. 176917).

The nonlinear structure of the spring characteristics with this conventional configuration is
As shown in Figure 3, the roll stiffness also increases in proportion to the nonlinearity, and when the roll stiffness increases, the impact when one wheel runs onto a convex part of the road surface becomes large, and the rolling of the vehicle body when driving on a rough road increases. This causes problems such as increased size and poor riding comfort.

The present invention provides a device that can suppress the increase in roll stiffness to an ideal value while ensuring non-linearity of the spring characteristics of a wheel suspension system.The embodiment shown in FIG. 1 will be described below.

In FIG. 1, 1 is a suspension arm attached to a vehicle body member so as to be able to swing up and down, 2 is a wheel attached to the suspension arm 1, and 3 is a main body interposed between the suspension arm 1 and the vehicle body member 4. The vertical movement of the wheel 2 is elastically supported by the main spring 3.

Reference numeral 5 denotes a leaf spring, and the leaf spring 5 has its center portion coupled to and supported by the vehicle body member 4 at the center in the width direction of the vehicle body via an elastic material 6 such as rubber, and its both end portions are connected to the left and right suspension arms 1 and the left and right suspension arms 1. They are respectively located between the upper vehicle body members 4.

A first helper 7 made of an elastic material such as rubber is attached to the lower surface near both ends of the leaf spring 5 and faces the upper surface of the suspension arm 1 at an appropriate distance. A second helper 8 made of an elastic material such as rubber is interposed between the nearby upper surface portion and the vehicle body member 4.

The second helper 8 has a very low spring constant and is configured to primarily function to lightly support both ends of the leaf spring 5 by connecting its upper and lower ends to the vehicle body 4 and the leaf spring 5.

In the above structure, the normal vertical swing of the wheel 2 is elastically supported by the spring force of the main spring 3, which is the same as in the conventional structure, and when both the left and right wheels bump, the left and right suspension arms 1 are 1 helper 7, and bends the leaf spring 5 upward while compressing the first helper 7.
The second helper 8 is also compressed and deformed, and these spring forces are added to obtain the same nonlinear spring characteristics as the conventional one shown in FIG. 3A, as shown in FIG. 2A.

However, if a wheel on one side bumps and a wheel on the other side rebounds, the leaf spring 5 simply tilts around its central support point to the vehicle body, with almost no deflection itself, and the first helper 7 and second helper 8
Since only the spring force of the main spring 3 is added to the spring force of the main spring 3, the roll stiffness is kept to a lower value than that of the conventional structure shown in Fig. 2, as shown in Fig. 3. It is possible to significantly improve ride comfort when driving on rough roads.

As described above, according to the present invention, the structure has a structure in which nonlinear spring characteristics are obtained by a horizontal leaf spring whose center portion is supported by a vehicle body member at the center of the vehicle body and helpers provided at both end portions of the leaf spring. This makes it possible to control the roll stiffness to a low value against the non-linearity of the spring characteristics, and improve the ride comfort when driving on rough roads, which has an extremely large practical effect.

[Brief explanation of the drawing]

FIG. 1 is a half front view showing an embodiment of the present invention. FIG. 2A-9 is a diagram showing the spring characteristics and roll rigidity characteristics of the device of the present invention, and FIG. 3A-9 is a diagram showing the spring characteristics and roll rigidity characteristics of the conventional device, respectively. 1...Suspension arm, 2...Wheel, 3.
... Main spring, 4 ... Vehicle body member, 5 ... Leaf spring, 6 ... Elastic material, 7 ... First helper, 8・・・・・・Second
Helper.

Claims (2)

[Scope of utility model registration request] (1) In a wheel suspension system in which a wheel is attached to a suspension arm that is attached to a vehicle body member so as to be able to swing up and down, and the vertical movement of the wheel is elastically supported by a main spring, a leaf spring is attached to the vehicle body member at its center. An automobile characterized in that the leaf spring is supported and installed horizontally so that both ends of the leaf spring face the upper parts of left and right suspension arms, respectively, and helpers made of an elastic material are provided at both ends of the leaf spring. wheel suspension system. (2) The helper is a first helper provided on the lower surface of the leaf spring, and a second helper whose upper and lower ends are respectively attached to the upper surface of the leaf spring and the vehicle body member. The automobile wheel suspension system described above.