JPH0239841Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a stabilizer for a strut-type suspension for non-steered wheels.

A torsion bar spring having a central portion disposed in the lateral direction of the vehicle body and a pair of side portions extending from the central portion in the longitudinal direction of the vehicle body, and a torsion bar spring provided on each side portion of the torsion bar spring and a steering knuckle. There is a strut-type suspension device that includes a stabilizer consisting of a bracket and a link that is swingably connected to the bracket (US Pat. No. 4,153,272).

In this suspension system, the torsion bar spring is positively twisted by the rotation of the steering knuckle accompanying steering, so the joint of the link with the steering knuckle rotates around the steering axis each time the steering is performed. Bending force is applied to the side portion of the torsion bar spring via the link. When the reaction force of this bending force acts on the strut, the friction of the piston and rod guide of the shock absorber that makes up the strut increases.
In order to prevent this, the connection part of the link with the steering knuckle is placed as far inward as possible in the lateral direction of the vehicle body on the axis of rotation of the wheel, and the link is tilted.

In other words, although the suspension system has a torsion bar spring associated with a steering knuckle that causes a large amount of vertical displacement of the wheel, it is necessary to eliminate the reaction force of the bending force acting on the strut. It is used in such a way that the amount of vertical displacement is reduced and taken out by the torsion bar spring, which is not effective.

The purpose of this invention is to provide a non-steered wheel that can extract the displacement under the wheel from a location where the amount of displacement is as large as possible, and that can also make the torsion bar spring work sensitively to the amount of displacement. An object of the present invention is to provide a stabilizer for a strut type suspension system.

The present invention is a strut-type suspension system in which struts are arranged on both sides of the vehicle body, and the upper end is swingably connected to the vehicle body, and the lower end is connected to a member that supports non-steering wheels. This is a stabilizer for a vehicle, which includes a central portion disposed in the lateral direction of the vehicle body and a pair of side portions extending substantially orthogonally to the central portion in the longitudinal direction of the vehicle body, and has a U-shape as a whole. Syonbar spring and
a link swingably connected to each side portion of the torsion bar spring and a bracket fixedly provided to each strut;
The link lies substantially vertically in its normal state and is substantially perpendicular to the side portions.

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

As shown in FIG. 1, strut-type suspension systems 10 incorporating the stabilizer according to the present invention are provided in pairs on both sides of the vehicle body at a distance from each other in the lateral direction.

Each suspension system 10 includes a cylindrical shock absorber 12 consisting of a cylinder, a piston, and a piston rod, and the tip of the piston rod 14 of the shock absorber is supported by the vehicle body via a conventionally well-known elastic support device 16. . An upper arm 22 of a wheel support member 20 is coupled to the lower end of the cylinder 18 of the shock absorber 12 . Lower arm 2 of wheel support member 20
4 is connected via a ball joint (not shown) to a swinging arm 26 that is supported on the vehicle body so as to be swingable in the vertical direction, and thereby an axle 28 that is rotatably supported on the wheel support member 20 It is movable in the vertical direction.

In each shock absorber 12, a coil spring 34 is disposed surrounding the piston rod 14 between spring seats 30 and 32 provided on the piston rod 14 and cylinder 18, respectively, and together with the shock absorber 12 constitutes a strut. .

The suspension system 10 suspends non-steered wheels, and a drive shaft 38 is disposed above each swing arm 26 to transmit rotational force to an axle 28 via a universal joint 36, as in the prior art.

In the suspension system 10, both the left and right axles 28 are movable in the vertical direction independently of each other, and when the vehicle turns, the vehicle body tends to tilt toward the outside of the turn, but the present invention is designed to suppress this tilting of the vehicle body. A stabilizer 42 is provided in association with the shock absorber 12 of each of the left and right suspension systems 10. The stabilizer 42 is a first
As shown in the figure, it consists of a torsion bar spring 43 and a link 52.

The torsion bar spring 43 is formed to have a U-shape when viewed from above, and includes a central portion 44 and a pair of side portions 46 that are connected to both ends of the central portion 44 and extend substantially at right angles thereto. Equipped with. The central portion 44 is disposed in the lateral direction of the vehicle body on the front side of the vehicle body relative to each shock absorber 12, and is rotatably supported by a side frame 48 of the vehicle body via a bracket 50. A pair of side portions 46 connected to the central portion 44 extend toward the respective shock absorbers 12.

The link 52 is swingably coupled to the side portion 46 of the torsion bar spring 43 and the bracket, as will be described later, and is positioned substantially vertically in its standard state, as shown in FIG. , which are disposed substantially orthogonal to the side portions 46 in the normal state.

As shown in FIG. 3, a cylindrical portion 54 is formed at the tip of the side portion 46 of the torsion bar spring 43 to receive the upper end 52a of the link 52, and extends through the cylindrical portion 54. A pair of cylindrical elastic members 56 that sandwich the cylindrical portion 54 are fitted into the end portion 52a. Further, a washer 5 is attached to the end portion 52a.
A pair of nuts 60 for tightening both elastic members 56 are screwed together via the sleeve 62.
Both elastic members 56 sandwich the cylindrical portion 54 between them even with the tightening margin defined by , so that the rod 52
The end portion 52a of is connected to the tip of the side portion 46.

On the other hand, a pair of cylindrical elastic members 68 are fitted into the lower end 52b of the link 52, and are fitted into the end 52b on both sides of a bracket 64 fixedly provided at the lower end of the cylinder 18. A pair of nuts 72 for tightening both elastic members 68 are also screwed together via washers 70. Both elastic members 68 sandwich the bracket 64 with an interference defined by a sleeve 74 therebetween, thereby connecting the end portion 52b of the link 52 to the bracket 64. The bracket 64 is attached to the wheel support member 20
The upper arm 22 of the upper arm 22 is fixed to a connecting portion 22a to the cylinder 18.

As is well known in the art, the elastic members 56 and 68 disposed at the joints at the upper and lower ends 52a and 52b of the link 52 allow the link 52 to pivot within its allowable deformation range. ,
When the cylinder 18 moves up and down integrally with the axle 28, this up and down movement is transmitted to the tip of the side part 46 of the torsion bar spring 43 without waste.

In the embodiment shown in FIG. 1 and FIG. 2, the stabilizer 42 according to the present invention is placed on the front side of the vehicle body rather than the shock absorber 12, but instead of this,
As shown in the figure, the stabilizer 42 is connected to the buffer 12.
It can also be placed on the rear side.

In the suspension system 10, when the left and right axles 28 move up and down relative to each other, the cylinder 18 moves up and down integrally with the axle 28, and this movement is transferred to the tip of the side portion 46 of the torsion bar spring 43 via the link 52. Reportedly. As a result, the center portion 44 of the torsion bar spring 43 undergoes torsional deformation, generating a force that suppresses the relative movement.

According to the present invention, the following effects can be obtained.

Since this is a stabilizer for a strut-type suspension system for non-steered wheels, there is no need to consider the bending force on the side portions of the torsion bar springs due to the rotation of the wheel support member during steering. Therefore, the link can be placed at any position on the bracket provided on the strut. In this way, there is a high degree of freedom in the arrangement of links.

Since the strut bracket and the side part of the torsion bar spring are provided with a link that is swingably connected to the side part of the torsion bar spring, the movement of the wheel support member which has the largest vertical displacement but an arc motion is transmitted to the torsion bar spring via the link. can be taken out. In this case, the pair of side portions transmitting torsional force to the central portion of the torsion bar spring are substantially perpendicular to the central portion, so that the side portions and the link will move as the wheel support member moves up and down. The amount by which the connecting portion is displaced in the lateral and longitudinal directions of the vehicle body is the smallest, and the bending force applied to the side portion due to the lateral and longitudinal displacement of the connecting portion is minimal. In this way, it is possible to apply a large displacement in the vertical direction to the side portions of the torsion bar spring while eliminating the influence of bending force on the side portions of the torsion bar spring as much as possible.

Since the link is substantially vertical in its standard state, vertical displacement of the strut can be directly transmitted to the side portions of the torsion bar spring. That is, the movement of the wheel support member can be most sensitively transmitted to the side portions. Further, since the side portions of the torsion bar spring are substantially perpendicular to the links in the standard state, the force applied from the links to the side portions is tangential to the side portions and is most effective. In this way, the movement of the wheel support member is most efficiently transmitted to the torsion bar spring, and tilting of the vehicle body when the vehicle turns can be effectively prevented.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a strut-type suspension device incorporating a stabilizer according to the present invention, FIG. 2 is a side view schematically showing the suspension device shown in FIG. 1, and FIG. FIG. 4 is a cross-sectional view showing the coupling structure between the stabilizer and the strut, and a side view schematically showing another embodiment of the present invention. 10: Suspension device, 12: Cylindrical shock absorber, 42: Stabilizer, 43: Torsion bar spring,
44: center part, 46: side part, 52: link.

Claims (1)

[Scope of utility model registration request] A stabilizer for a strut-type suspension system in which struts are arranged on both sides of the vehicle body, the struts being swingably connected to the vehicle body at the upper end and connected to a member supporting non-steering wheels at the lower end. A torsion bar spring having a U-shape as a whole, comprising a central portion disposed in the lateral direction of the vehicle body and a pair of side portions extending substantially orthogonally to the central portion in the longitudinal direction of the vehicle body. , a link swingably connected to each side portion of the torsion bar spring and a bracket fixedly provided to each strut, the link being substantially vertically positioned in a standard state. , and substantially orthogonal to said side portions, a stabilizer for a strut-type suspension for a non-steered wheel.