JPH04159110A - Trailing twist beam type rear suspension - Google Patents

Abstract

PURPOSE:To simplify the structure by working a trailing arm and a diagonal arm as suspension springs when right and left wheels are rocked in the same phase and by working the diagonal arm as a stabilizer when the right and left wheels are rocked in a reverse phase. CONSTITUTION:Shock absorbers 18, 20 are arranged between a car body 16 and a pair of brackets 18a, 20a provided solidly in the vicinity of both ends of a twist beam 10 by which right and left wheels 12, 14 are supported in the both ends in such a way that they can be rotated. A pair of trailing arms 22R, 22L are provided, which are formed of leaf spring, and which are fixed to the car body 16 in the front end and fixed to the twist beam 10 in the rear end. A pair of diagonal arms 24R, 24L are also provided, which are solidly connected to the front end of the trailing arms 22R, 22L made of leaf spring which respond in the front end, and which are fixed to the end part of the twist beam 10 in the reverse way in the rear end. The diagonal arms 24R and 24L are connected with each other in the middle by a connecting means 26.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a rear suspension for a vehicle such as an automobile, and more particularly to a trailing twist beam type rear suspension.

[Prior Art] As one of the rear suspensions of vehicles such as automobiles, for example, Utility Model Application Publication No. 1, filed by the same applicant as the present applicant,
- As described in Publication No. 134503, there is a twist beam that rotatably supports the wheels at both ends, and a twist beam that is spaced apart from each other in the left-right direction of the vehicle, is pivoted to the vehicle body at the front end, and is fixed to the twist beam at the rear end. A trailing twist beam type rear suspension consisting of a pair of trailing arms has been known for some time, and is mainly used in small cars.

[Problems to be Solved by the Invention] As described in the above publication, a trailing twist beam type rear suspension also incorporates a stabilizer and a lateral rod for the purpose of ensuring roll rigidity and lateral rigidity of the vehicle, respectively. Suspension springs such as coil springs are also incorporated to absorb wheel bounce and rebound.

However, since the stabilizer, lateral rod, and suspension spring are each independent members and each performs a unique function, it is not possible to omit any of these members, so the conventional trailing twist beam type In rear suspensions, it is difficult to reduce the weight of the suspension and simplify its structure.

The present invention has been made in view of the above-mentioned problems in the conventional trailing twist beam rear suspension, and an object of the present invention is to provide a trailing twist beam rear suspension that is light in weight and has a simple structure. There is.

[Means for Solving the Problems] According to the present invention, the above-mentioned object is achieved by a twist beam rotatably supporting wheels at both ends, and a front end comprising a twist beam rotatably supporting wheels at both ends, and leaf springs spaced apart from each other in the left-right direction of the vehicle. a pair of trailing arms fixed to the vehicle body at the rear end and fixed to the twist beam at the rear end; and a leaf spring connected to the vehicle body at the front end adjacent to the front end of the corresponding trailing arm at the rear end. A trailing twist beam type rear suspension having a pair of diagonal arms fixed to the twist beam adjacent to the rear ends of the trailing arms on left and right opposite sides of the twist beam and connected to each other at an intermediate portion. achieved.

[Operation of the invention] According to the above-described configuration, when the left and right wheels bounce and rebound in the same phase, both the trailing arm and the diagonal arm substantially act as a cantilevered leaf spring. It functions as a suspension spring. Also, when the left and right wheels bounce and rebound in opposite phases, the trailing arm also functions as a suspension spring, but the diagonal arm has a substantial gap between its front end and the mutually connected part. Since it cannot be elastically deformed and acts as a leaf spring only on the side of the twist beam from the mutually connected parts, the effective length of the leaf spring becomes shorter and its spring constant becomes higher, which makes it useful as a stabilizer. fulfills the functions of Furthermore, since the rear suspension of the present invention has a kind of torsus structure when viewed from above the vehicle, the trailing arm and diagonal arm do not substantially deform even if a lateral force is applied to the wheel. functions as a lateral rod.

Therefore, the suspension springs, stabilizers, and lateral rods that have been incorporated in the past are unnecessary, making it possible to reduce the weight of the trailing twist beam type rear suspension and simplify its structure.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention will be explained in detail below by way of example embodiments with reference to the accompanying figures.

[Embodiment] Fig. 1 is a perspective view showing one embodiment of the trailing twist beam type rear suspension according to the present invention, Fig. 2 is an enlarged partial sectional view taken along the line ■-■ in Fig. 1, and Fig. The figure is an illustrative perspective view showing the operation of the embodiment when the left and right wheels bounce and rebound in the same phase, and Figure 4 shows the operation when the left and right wheels bounce and rebound in opposite phases. It is an illustrative perspective view showing operation of an example.

In FIG. 1, reference numeral 10 designates a twist beam rotatably supporting wheels 2 and 14 at both ends. A pair of brackets 18a and 20 are provided near both ends of the twist beam.
shock absorbers 18 and 20 are provided between these brackets and the vehicle body 16. In the illustrated embodiment, both ends of the twist beam are cylindrical, and the cross-sectional shape of the middle portion thereof is a downwardly open U-shape, but the cross-sectional shape of the twist beam may be any shape.

Further, in FIG. 1, 22R and 22L indicate a pair of trailing arms made of leaf springs, whose front end is fixed to a frame (not shown) of the vehicle body 16, and whose rear end is fixed to a twist beam. 24R and 2
4L indicates a pair of diagonal arms made of leaf springs, whose front ends are integrally connected to the front ends of corresponding trailing arms, and whose rear ends are fixed to opposite left and right ends of the twist beam. Trailing arm 22R
and 22L extend in the longitudinal direction of the vehicle and are spaced apart from each other in the lateral direction of the vehicle, and the diagonal arms 24R and 24L are connected to each other at the intermediate portion by a connecting means 26 such as a rivet, a pin, or an adhesive.

In particular, in the illustrated embodiment, the trailing arm and the diagonal arm are made of plate-shaped FRP.
The corresponding trailing arms and diagonal arms are glued together at their front ends and connected together by glue at their rear ends, which have an arcuate cross-section, and cooperate with each other to form the twist beam into a substantially U-shape. It extends to fit between the two. The twist beams that engage the rear ends of these arms have a high surface roughness, which avoids any relative movement between them. Further, as shown in FIG. 2, a pair of flange members 28R and 28L made of metal plates are integrally bonded to the upper and lower surfaces of the front ends of the corresponding trailing arms and diagonal arms, respectively. The front end of the flange member is fixed to the frame 16a of the vehicle body by bolts 30 that are inserted through holes that are provided in six pairs of flange members and are aligned with each other.

In the illustrated embodiment, when the left and right wheels 12 and 14 bounce and rebound in the same phase, as shown in FIG. By elastically deforming in the vertical direction in a fixed state, it essentially acts as a cantilevered leaf spring,
This performs the same function as a conventional suspension spring.

Furthermore, when the left and right wheels bounce and rebound in opposite phases, the trailing arms 22R and 22L also function as suspension springs, as shown in FIG. 4, but the diagonal arms 24R and 24
L cannot substantially elastically deform between its front end and the mutually connected part, and acts as a leaf spring only on the side of the twist beam 10 from the mutually connected part. , the effective length of the leaf spring is reduced and its spring constant is increased, thereby performing a similar function to a conventional stabilizer.

Furthermore, the trailing arm and the diagonal arm have a kind of toss-slid structure when viewed from above the vehicle, and these arms are in the form of leaf springs that extend along a substantially horizontal plane. Even if a lateral force is applied to the wheels 12 and 14, the trailing arm and the diagonal arm do not substantially deform in the left-right direction of the vehicle, and these arms perform the same function as a conventional lateral rod.

Furthermore, in the illustrated embodiment, the pair of trailing arms and diagonal arms are integrally bonded to each other at the front and rear ends, making it easy and efficient to assemble these arms to the vehicle. can.

Although the present invention has been described in detail with respect to specific embodiments above, the present invention is not limited to such embodiments, and various other embodiments are possible within the scope of the present invention. This will be clear to those skilled in the art.

[Effects of the Invention] As is clear from the above explanation, according to the present invention, when the left and right wheels bounce and rebound in the same phase, both the trailing arm and the diagonal arm function as suspension springs. Also, when the left and right wheels bounce and rebound in opposite phases, the trailing arm also functions as a suspension spring, but the diagonal arm also functions as a stabilizer, and the rear suspension of the present invention It has a kind of toss structure, and the trailing arm and diagonal arm do not substantially deform even if lateral force is applied to the wheel, and these arms function as lateral rods, so they are different from conventional By omitting the suspension spring, stabilizer, and lateral rod, the weight of the trailing twist beam rear suspension can be reduced and its structure can be simplified.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing one embodiment of the trailing twist beam type rear suspension according to the present invention, Fig. 2 is an enlarged partial sectional view taken along the line Fig. 4 is an illustrative perspective view showing the operation of the embodiment when the left and right wheels bounce and rebound in the same phase, and Figure 4 shows the operation of the embodiment when the left and right wheels bounce and rebound in opposite phases. It is an illustrative perspective view. 10...Twist beam, 12.14...Wheel, 1
6... Vehicle body, 18.20... Shock absorber,
22R, 22L... Trailing arm, 24R, 2
4L... Diagonal arm, 26... Connection means,
28R, 28L...Flange member'P, Figure 1 w, Figure 2

Claims (1)

[Claims] A twist beam that rotatably supports wheels at both ends,
a pair of trailing arms made of leaf springs spaced apart from each other in the left-right direction of the vehicle and fixed to the vehicle body at the front end and fixed to the twist beam at the rear end; The trailing arm is connected to the vehicle body adjacent to the front end of the ring arm, and the trailing arm is fixed to the twist beam at the rear end adjacent to the rear end of the trailing arm on the opposite left and right side of the twist beam, and is connected to each other at an intermediate portion. Trailing twist beam rear suspension with a pair of diagonal arms.