JPH07323713A - Trailing arm type suspension - Google Patents

Abstract

PURPOSE:To provide a trailing arm type suspension which can be manufactured small and light, whose rigidity can be easily and inexpensively varied and whose operational safety can be properly improved. CONSTITUTION:A torsion beam 2 is formed bent in a form that the side of a central part 2c in the car breadth direction extends to the front side of a car body more than its both end parts 2a, 2a, and the both end parts 2a, 2a of this torsion beam are connected to one end parts 1a, 1a of each of trailing arms 1, 1 as a shaft part connected to one end part 4a of a spindle 4 projectively provided in the inside direction of the trailing arms 1, 1 or to this spindle 4 is made to pass through to the both end parts 2a, 2a of this torsion beam 2. A portion to the front side of the car body rather than the both end parts 2a, 2a of the torsion beam 2 is connected to each of the trailing arms 1, 1 positioned outside of it through reinforcing members 3, 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a trailing arm type suspension used as a rear suspension of a vehicle such as an automobile.

[0002]

2. Description of the Related Art Heretofore, as a trailing arm type suspension of this type, for example, a full-open sho 58-4510.
Some are listed in Japanese Patent No. 8. As shown in FIG. 2 of the publication, this conventional suspension has a pair of left and right trailing arms, one end of which is attached to a vehicle body and the other end of which is provided with rear wheels, in the longitudinal center portion. The left and right ends of the torsion beam are welded together to integrate them.

Further, conventionally, there is also a trailing arm type suspension having a structure different from that described above, in which the trailing arm and the torsion beam are not welded but the respective parts thereof are integrally formed by press molding.

[0004]

In the former one of the above-mentioned conventional ones, since the trailing arm has a connection structure in which a torsion beam is welded to the longitudinal center of the trailing arm, the trailing arm swings up and down, and When the trailing arm twists the torsion beam due to the phase input, stress concentration occurs at the welded portion. For this reason, the mechanical strength of the welded portion becomes weaker, and it is necessary to secure a certain strength or higher at this welded portion, so that it becomes necessary to increase the size of each part of the suspension. Therefore, the former one of the above-mentioned conventional ones has a problem that the entire suspension becomes large and the weight thereof becomes large.

Further, in the former case of the above-mentioned conventional, it is difficult to change the specifications of each part of the suspension variously while maintaining the welding position of the trailing arm and the torsion beam at a certain strength or more. As a result, in the former case, the torsion, vertical bending, and
The degree of freedom in setting rigidity such as lateral bending is considerably limited, and it is difficult to improve maneuverability.

On the other hand, unlike the former case, in the latter case of the above-mentioned conventional case, since the trailing arm and the torsion beam are not connected by welding, there is a problem that stress concentration occurs in the welding place like the former case. Does not happen. However, in this latter one, since the trailing arm and the torsion beam are integrally formed by press working, the rigidity of twisting, vertical bending, horizontal bending, etc. can be changed by changing the specifications of these parts. To do so, it is necessary to change the die for the expensive press.
Therefore, it is difficult to change the specifications of each part, and the manufacturing cost of the mold is high.

The present invention was devised under such circumstances, and it can be manufactured in a small size and a light weight, and its rigidity can be easily and inexpensively changed to improve maneuverability. It is an object of the invention to provide a trailing arm type suspension that can be appropriately improved.

[0008]

In order to solve the above problems, the present invention takes the following technical means.

That is, according to the present invention, a pair of left and right trailing arms having a wheel mounting spindle attached to one end thereof and a vehicle body attaching portion provided to the other end thereof, and each of the pair of trailing arms. A trailing arm type suspension including a torsion beam provided between the two trailing arms connected to each other, wherein the torsion beam has a shape in which the central portion side in the vehicle width direction extends from the both ends toward the front side of the vehicle body. Both ends of the torsion beam are bent and formed, and one end of a spindle provided to project inward of each of the trailing arms or a shaft portion connected to the spindle penetrates both ends of the torsion beam. Is connected to one end of each of the trailing arms, and Site of the vehicle body front side than the end portions of the Yonbimu is characterized by being connected to each other via the respective trailing arm and the reinforcing member located outside thereof.

[0010]

In the trailing arm type suspension according to the present invention, both ends of the torsion beam are attached to each other by the wheel mounting spindle or the shaft portion connected to the spindle penetrating both ends of the torsion beam. Since it is connected to one end of the trailing arm, it is possible to increase the connection strength against the torsional force and the vertical bending force of the torsion beam that acts in the direction orthogonal to the axial direction of the spindle. Further, unlike the conventional welded connection structure, there is no problem that the connection strength is reduced due to stress concentration at the welded portion.

As a result, in the present invention, it is not necessary to increase the size of these portions for the purpose of increasing the strength of the connecting portion between the trailing arm and the torsion beam, and the overall size and weight of the suspension can be reduced. .

Further, the trailing arm type suspension according to the present invention has a structure in which a pair of left and right trailing arms, a torsion beam bent into a predetermined shape, and a reinforcing member are connected to each other. Torsional force and vertical bending force act, and lateral bending force acts on the reinforcing member. Therefore, it is possible to easily change the rigidity with respect to twisting and longitudinal bending by changing the specifications of the torsion beam. Further, the rigidity of lateral bending can be easily changed by changing the shape, size, or mounting angle of the reinforcing member. Further, since it is not necessary to manufacture these torsion beams and reinforcing members using a press die, it is not necessary to remanufacture an expensive press die each time the specification is changed.

As a result, according to the present invention, the specifications of the torsion beam and the reinforcing member can be changed easily and inexpensively, so that the flexibility of setting the rigidity of the entire suspension can be increased and the maneuverability can be appropriately improved. That is a special effect.

Particularly, in the present invention, as described above,
Since the mechanical strength of the connection part between the both ends of the torsion beam and the trailing arm is strong, unlike the conventional method, the size of each part is unreasonably limited because the strength of this connection part is secured at a certain level or more. Since there is no such problem, the effect that the degree of freedom in setting the rigidity of the entire suspension can be increased is obtained from this point as well.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The preferred embodiments of the present invention will be described below.
A specific description will be given with reference to the drawings.

FIG. 1 is an overall perspective view of a trailing arm type suspension according to the present invention. This suspension consists of a pair of left and right trailing arms 1,
1, a torsion beam 2 arranged between the trailing arms 1 and 1, and reinforcing members 3 and 3 for connecting the torsion beam 2 and the trailing arms 1 and 1.

The trailing arms 1 and 1 are formed of, for example, a flat metal plate, and one end portion 1 thereof is formed.
A spindle 4 for attaching wheels (rear wheels) is attached to the a and 1a so as to project outward. The trailing arms 1 and 1 are provided at the other ends 1b and 1b with mounting parts 5 each having a rubber bush 5a for mounting the other ends 1b and 1b to a vehicle body frame (not shown). There is.

The torsion beam 2 is formed, for example, by bending a groove-shaped steel material (channel material) having a U-shaped cross section so that the entire planar shape thereof is an inverted U shape. That is, this torsion beam 2
Has bent portions 2b, 2b extending from the left and right end portions 2a, 2a toward the front of the vehicle body (in the direction of arrow a) in a state of being arranged between the trailing arms 1, 1.
b and 2b are connected to each other via a central portion 2c having a shape close to a straight line.

Left and right ends 2 of this torsion beam 2
a and 2a are one end portions 1a of the trailing arms 1 and 1,
It is overlapped on the inside of 1a, but both ends 2a,
One end 4a of the spindle 4 projecting inward of each trailing arm 1 is passed through 2a. Thereby, both ends 2a, 2a of the torsion beam 2 are connected to one ends 4a, 4a of the trailing arms 1, 1.

Further, one end portion 4a of each spindle 4 is provided so as to project further inward than the torsion beam 2, and the lower end portions of a pair of left and right spring dampers 6, 6 are respectively provided at this projecting portion. It is connected.
The upper ends of the spring dampers 6 and 6 are attached to a vehicle body frame (not shown).

The reinforcing members 3 and 3 are formed by processing a flat metal plate, for example, and one end portions 3a and 3a of the reinforcing members 3 and 3 are bent portions 2b and 2 of the torsion beam 2.
It is connected to the side surface of b. The other ends 3b and 3b of the reinforcing members 3 and 3 are connected to the end 1b on the side where the mounting portion 5 of each trailing arm 1 is provided, as shown in FIG. 2, for example. As a means for connecting both end portions 3a, 3b of each of the reinforcing members 3 to the trailing arm 1 or the torsion beam 2, it is possible to employ welding means as described later.

In FIG. 2, the mounting portion 5 has a structure in which a rubber bush 5a is fitted inside a metal boss 5b which penetrates both the reinforcing member 3 and the trailing arm 1. . By inserting the bolt 8 into the rubber bush 5a, it is possible to fix the bolt to the bracket 9 of the vehicle body frame.

In the trailing arm type suspension having the above structure, in the assembly structure shown in FIG.
First, when the spindles 4 and 4 supporting the wheels move up and down, the trailing arms 1 and 1 swing up and down with the mounting portions 5 and 5 as fulcrums. At the same time, the vertical movement force of the spindles 4 and 4 is transmitted to the both ends 2a of the torsion beam 2 through which the spindles 4 and 4 penetrate, and the torsion beam 2 is twisted. As a result, the torsion beam 2 causes the trailing arms 1 and 1 to return to their original positions by the twisting force F1.

In this case, both ends 2 of the torsion beam 2 are
Since the spindles 4 and 4 are connected to the a and 2a and the trailing arms 1 and 1, the torsional force F1 of the torsion beam 2 acts as a shearing force of the spindles 4 and 4. Then, it becomes a force for swinging and returning the trailing arms 1, 1 to their original positions. Therefore, in such a connecting structure, it is possible to withstand a considerably large twisting force F1 without increasing the size of this connecting portion or this peripheral portion.

Further, the torsional force F1 of the torsion beam 2
Most of this is transmitted to the trailing arms 1 and 1 via the spindles 4 and 4, so that the stress distribution at the connecting portion between the reinforcing members 3 and 3 and the torsion beam 2 becomes small. Therefore, even if welding means is used as a means for connecting both end portions 3a, 3b of the reinforcing members 3, 3 to the torsion beam 2 or the trailing arm 1, this connecting portion is not easily damaged.

When the vertical movements of the spindles 4 and 4 occur, the torsional force F1 is applied to the torsion beam 2 as described above.
However, a vertical bending force F2 is also generated. Therefore, by changing the shape and size of the torsion beam 2 in various ways, the rigidity with respect to twisting and longitudinal bending can be arbitrarily changed. Moreover, this torsion beam 2
In manufacturing the above, for example, it is only necessary to bend a predetermined steel material, and it is not necessary to perform press forming using an expensive die. Therefore, the specification of the torsion beam 2 can be changed easily and inexpensively.

On the other hand, when a horizontal force is applied to the wheels supported by the spindles 4 and 4, a lateral bending force F3 is generated. The lateral bending force F3 not only acts on the torsion beam 2 but also the reinforcing member 3 , 3 also works effectively.
Therefore, if the specifications such as the shape and size of the reinforcing members 3 and 3 or the attachment angle with respect to the torsion beam 2 are variously changed, the rigidity with respect to lateral bending can be arbitrarily changed. Also, these reinforcing members 3, 3
Since the shape may be simpler than that of the torsion beam 2, the specification change is easier and cheaper than the specification change of the torsion beam 2.

As described above, since the specifications of the torsion beam 2 and the reinforcing members 3 and 3 are variously changed and the rigidity can be easily tuned, the degree of freedom in setting the suspension can be increased and the maneuverability can be greatly improved. It is possible.

In the above embodiment, since the spring damper 6 is attached to the one end portion 4a of the spindle 4, the center of the spring damper 6 can be easily and accurately aligned with the wheel support center. In addition to the advantages, the spring damper 6 can be easily attached. However, it is needless to say that the present invention does not necessarily have to have such a configuration, and the mounting structure of the spring damper 6 does not matter.

Further, in the above embodiment, the one end portion 4a of the spindle 4 is directly passed through the both end portions 2a, 2a of the torsion beam 2, but the present invention is not limited to this. In the present invention, for example, one end portion 4b of the spindle is provided with a shaft portion formed separately from the spindle 4, and the shaft portion is made to penetrate both ends 2a, 2a of the torsion beam 2. Good.

Further, in the present invention, the both ends 2a, 2a of the torsion beam 2 are assisted with respect to the trailing arms 1, 1 so that the both ends 2a, 2a of the torsion beam 2 are not inadvertently displaced in the vehicle width direction. It doesn't matter if they are welded together.

FIG. 3 is a perspective view of a main part showing another embodiment of the trailing arm type suspension of the present invention.
In this suspension, the end portion 3b of the reinforcing member 3 has a trailing arm 1 which is larger than that in the embodiment shown in FIG.
Is connected to a portion near the central portion in the longitudinal direction. In the present invention, as described above, the specific position for connecting the reinforcing member 3 can be variously changed.

In addition, according to the present invention, the trailing arms 1 and 1, the torsion beam 2 and the reinforcing members 3 and 3.
The specific configuration of each part such as can be variously changed in design. Further, any type may be used regardless of types such as a rear wheel drive type and a front wheel drive type.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of a trailing arm type suspension according to the present invention.

FIG. 2 is a sectional view taken along line XX of FIG.

FIG. 3 is a perspective view showing another example of a trailing arm type suspension according to the present invention.

[Explanation of symbols]

 1 Trailing Arm 1a One End (Trailing Arm) 1b Other End (Trailing Arm) 2 Torsion Beams 2a, 2a Both Ends (Torsion Beam) 2c Central Part (Torsion Beam) 3 Reinforcing Member 4 Spindle 4a One End (Spindle) 5 Attachment Department

Claims (1)

[Claims] 1. A pair of left and right trailing arms each having a wheel mounting spindle attached to one end thereof and a vehicle body attaching portion provided to the other end thereof, and a pair of trailing arms connected to the pair of trailing arms. A trailing arm type suspension including a torsion beam provided between both of these trailing arms, wherein the torsion beam is bent and formed in a shape in which a central portion side in the vehicle width direction is extended to a vehicle body front side from both ends thereof. At the same time, both ends of the torsion beam are formed by one end of a spindle provided so as to project inward of each of the trailing arms or a shaft portion connected to the spindle is passed through both ends of the torsion beam. , Connected to one end of each of the trailing arms, and both ends of the torsion beam A trailing arm type suspension characterized in that a portion on the front side of the vehicle body is connected to each trailing arm located outside thereof via a reinforcing member.