JPH0466314A - Suspension of trailing arm type - Google Patents

Abstract

PURPOSE:To reduce the number of parts and prevent a car body rear part from being lifted upon braking operation by providing a trailing arm composed of leaf spring and a link coupled to moving part of shock absorber and wheel support member so as to swing freely. CONSTITUTION:A member for supporting wheels 16 is suspended by trailing arms 12. A shock absorber 16 is arranged at each end of the support member 10 and connected to the support member 10 and car body 18 so as to swing freely. The arm 12 is composed of leaf spring. A link 20 is coupled to a part 24 of shock absorber 16 moving together with the support member 10 and the support member 10 through bush members so as to swing freely. A lateral rod 32 is coupled to the support member 10 and the car body 18 to control lateral displacement of the support member 10. When rotating force is applied to the arm 12 upon braking operation, the movement of side end part of the support member 10 is restrained by the link 20 accordingly.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a trailing arm suspension;
In particular, the present invention relates to a suspension using a leaf spring as a trailing arm.

(Prior art) With a trailing arm suspension,
There is a suspension in which a leaf spring is placed outside the rail link arm in parallel with the trailing arm (Japanese Utility Model Publication No. 59-156807). This uses a leaf spring instead of a coil spring, which is the suspension spring.

It has also been proposed to configure the trailing arm itself as a leaf bridge ("PLASTICWORL").
, D”AI] RIL 1989, °89 Tokyo Sen-Tasho exhibition car).

Instead of trailing arm type suspension,
Some rat-type suspensions use leaf springs for the suspension arms (ll5
P4.7 [i7.1:14). This suspension arm consists of multiple leaf springs of different sizes stacked on top of each other.

(Problems to be Solved by the Invention) If a leaf spring is simply used as a suspension spring, a trailing arm is provided outside the leaf spring, so the number of parts cannot be reduced, and there are few advantages in terms of space.

If the trailing arm itself is constructed from a leaf splinter, the above disadvantages will not arise. However, when the trailing arm is configured with a leaf splinter, it is difficult to suppress the rotational force generated in the tires during braking, so the rear part of the vehicle body tends to be lifted upward.

Since the rotational force acts near the joint end of the trailing arm with the member that supports the wheel, even if the trailing arm is constructed by stacking a plurality of leaf springs of different sizes, Unable to prevent lift condition.

Therefore, an object of the present invention is to provide a trailing arm type suspension in which the trailing arm is constructed of a leaf splinter, and which can suppress the lift state, that is, enhance the anti-lift effect. .

(Means for solving the problem) A trailing arm suspension according to the present invention includes:
a member that supports the wheels; a shock absorber that is swingably coupled to the support member and the vehicle body; A trailing arm made of a leaf spring is coupled to a support member, and a portion of the shock absorber that moves together with the support member is swingably coupled to the support member through elastic bushings, respectively. Contains links.

(Operation and Effect) When a rotational force is applied to the trailing arm during braking, the movement of the end of the trailing arm on the supporting member side is restrained by the link, and deformation of the end is suppressed. As a result, the instantaneous center of rotation of the wheel shifts to the front, and the force required to achieve the lift state becomes smaller.

Since the instantaneous center of rotation of the wheels during braking can be set at an appropriate location, excessive lift can be prevented.

Nonlinear characteristics can be provided by the initial setting of the trailing arm, which is a leaf spring, and the characteristics of the bushings placed at both ends of the link. Further, by changing the characteristics of the bushing, the degree of restraint of the trailing arm can be adjusted.

(Example) As shown in FIG. 1, a trailing arm type suspension is one in which a member 10 that supports a wheel is suspended by a trailing arm 12. In the illustrated embodiment, the support member 10 is a twisted beam and has two wheels 1
4 are rotatably attached to both ends of the twist beam.

Shock absorbers 16 are arranged at each end of the support member 1o and are swingably coupled to the support member 10 and the vehicle body 18.

The trailing arm 12 is formed by a leaf spring and extends in the longitudinal direction of the vehicle body, and its front end is connected to the vehicle body, and its rear end is connected to the support member 10. The bonding is performed by Holt bonding, etc., which is known per se. As a result of the trailing arm 12 being formed by a leaf spring, the trailing arm 12 also functions as a suspension spring,
There is no need for a conventional coil spring.

A link 20 is swingably coupled to a portion 24 of the shock absorber 16 that moves together with the support member 10 and to the support member 10 via elastic bushings 22, respectively. Here, the parts that move together with the support member 10 are the cylinder 24 that constitutes the shock absorber 16;
And among the piston rods 26 that extend and contract with respect to this cylinder 24, those that are connected to the support member 10,
The illustrated embodiment is a cylinder 24.

The link 20 is a bracket 2 attached to the support member 10.
8 and a bracket 30 attached to the cylinder 24 so as to be swingable. This link 20 restrains the trailing arm 12 from deforming due to rotational force based on braking force.

In this case, the extent to which the trailing arm 12 is restrained can be adjusted by changing one or more of the following factors: the length of the link 20, the length and mounting angle of the brackets 28 and 30, the hardness of the bushing 22, etc. .

In the above embodiment, the support member 1o is a twist beam, and the two wheels 14 attached to both ends of the support member 10 bounce and rebound at the same time. That is,
The suspension is of a trailing link twist beam type, but an independent trailing suspension type may be used instead, in which case the support member supports one wheel and swings independently. In this specification, the term trailing arm type includes both types.

A lateral rod 32 is swingably coupled to the support member 1o and the vehicle body 18, and lateral displacement of the support member 10 is regulated by the lateral rod 32.

As shown in FIG. 3, when a braking force F is applied to the tire 15 during braking, a rotational force F is generated that tries to rotate the tire 15 upward at the grounding point C of the tire 15.

will occur. This rotational force F1 acts on the trailing arm 12, but since there is a link 20, the trailing arm 1
The movement of the end of the support member 2 on the support member 10 side is restrained by the link 20, thereby preventing deformation of the end. As a result, the instantaneous center of rotation of the wheel is 0. moves forward.

The braking force F is a component force F directed vertically from the grounding point C.
Instantaneous center of rotation 0. Because it is resolved into a component force F2 directed in the straight line connecting the ground point C and the point C, or the momentary rotation center 01 moves forward, the component force F becomes smaller, and as a result, the rotational force that creates the lift state becomes smaller. ing.

In the case where there is no link, the end of the trailing arm 40 on the supporting member 42 side can be freely deformed, as shown in FIG. The instantaneous center of rotation 02 is located near the support member 42. This must mean that a large rotational force was being applied to the trailing arm 40 (moving).

According to the present invention, depending on the initial setting state of the trailing arm 12 and the characteristics of the bushings 22 arranged at both ends of the link 20, the tires 15a, 15b, and 15c are adjusted according to the braking force as shown in FIG. When the trailing arm is in such a position, the trailing arm can be deformed as shown in 13a, 13b, and 13c, and nonlinear characteristics can be provided.

On the other hand, with the one without a link, as shown in Fig. 5, when the tire or braking force reaches the positions 45a, 45b, or 45c, the trailing arm moves to 41a.
, 41b, 41c (7), and have linear characteristics.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a trailing arm suspension according to the present invention, Fig. 2 is a side view showing the deformation state of the trailing arm due to braking force, and Figs. 3 and 4 show the rotational force due to braking force and the instantaneous This is a side view showing the center of rotation.
The figure is a side view of the one according to the present invention, FIG. 4 is a conventional one, and FIG. 5 is a conventional one showing a deformed state of the trailing arm due to braking force. :Support member, :Trailing arm, :Shock absorber, Link, :Push.

Claims (1)

[Claims] a member that supports the wheels; a shock absorber that is swingably coupled to the support member and the vehicle body; A trailing arm made of a leaf spring is coupled to a support member, and a portion of the shock absorber that moves together with the support member is swingably coupled to the support member through elastic bushings, respectively. Trailing arm suspension including links.