JPH07137519A - Installing structure of suspension member on car body - Google Patents

Abstract

PURPOSE:To depress the rolling of a suspension member by deciding the position of a front mount in the side view on or around the suspension instantaneous center axis and at the upper part as compared with a rear mount. CONSTITUTION:A suspension member 34 for stationing a front and a rear mount 30, 32 at the front and the rear of an intermediate part 28 for connecting a left and a right suspension arm to each other is installed on a car body 36 through both the mounts 30, 32. In an automobile standard state, position of center of gravity in the side view of the front mount 30 is positioned on or around the suspension instantaneous center axis S in the side view, and position of center of gravity in the side view of the rear mount 32 is positioned to the lower part as compared with the position of the front mount 30. Thus, the rolling of the suspension member 34 is prevented or depressed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for mounting a suspension member on a vehicle body, and particularly to a suspension arm for a right suspension that supports a right tire and a suspension arm for a left suspension that supports a left tire. The present invention relates to a structure for attaching a rear suspension member that swingably connects a vehicle body to a vehicle body.

[0002]

2. Description of the Related Art As shown in FIG. 6, a suspension arm 10 for supporting a tire is provided with an intermediate portion 11 which is swingably connected. A suspension member 14 for disposing a rear mount 13 on a vehicle body (not shown) via a front mount 12 and a rear mount 13.
There is a structure to be attached to (Japanese Utility Model Publication No. 61-16907).

In the above mounting structure, only the suspension arm is connected to the suspension member, and the shock absorber and the coil spring are not connected to the suspension member. Therefore, a lateral force mainly generated at the time of cornering is applied to the suspension member from the suspension arm.

[0004]

In the standard state of the automobile, the right center of the suspension on the instantaneous center in side view,
A first virtual plane including the instantaneous center of the right suspension in rear view and the contact point of the right tire, and the instantaneous center of the left suspension in side view and the left suspension's rear view in a standard state of the vehicle. When the line of intersection with the second virtual plane including the ground contact point of the left tire is the suspension instantaneous central axis S, the lateral force applied from the suspension arm 10 works toward the suspension instantaneous central axis S. However, FIG.
As is clear from the above, since there are offsets O ₁ and O ₂ from the front mount 12 and the rear mount 13 to the suspension instantaneous center axis S, respectively, the suspension member 14 rolls around the suspension instantaneous center axis S. .

An object of the present invention is to provide a structure for mounting a suspension member on a vehicle body capable of suppressing the rolling of the suspension member.

[0006]

According to the present invention, there is provided an intermediate portion for swingably connecting a suspension arm for a right suspension supporting a right tire and a suspension arm for a left suspension supporting a left tire. And a front mount in front of the middle part,
A structure in which a suspension member in which a rear mount is arranged behind the intermediate portion is attached to a vehicle body via the front mount and the rear mount, and an instantaneous center in a side view of the right suspension in a standard state of an automobile, An imaginary plane including the instantaneous center of the right suspension in rear view and the ground contact point of the right tire is set as a first plane, and the instantaneous center of the left suspension in side view and the left suspension in a standard state of an automobile are defined. When an imaginary plane including the instantaneous center in rear view and the ground contact point of the left tire is defined as a second plane, and an intersection line between the first plane and the second plane is defined as a suspension instantaneous central axis line, a side view Position of the front mount on the instantaneous central axis of the suspension in side view, or Set in the vicinity, and determines the position of the rear mount in the side view below the position of the front mounts.

[0007]

[Operation and Effect] Generally, the instantaneous central axis of the suspension is inclined downward from the front of the vehicle toward the rear. Therefore, the position of the front mount in side view is set on or near the suspension central axis in side view, and the position of the rear mount in side view is set lower than the position of the front mount. The mount will be located on or near the instantaneous central axis of the suspension in side view. Accordingly, it is possible to prevent or suppress the rolling of the suspension member due to the lateral force applied from the suspension arm, that is, the rolling around the suspension central axis.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIGS. 1 to 3, the mounting structure includes a suspension arm 22 for the right suspension supporting a right tire 20 and a suspension arm 26 for a left suspension supporting a left tire 24.
A front mount 30 in front of the intermediate portion 28, a suspension member 34 in which a rear mount 32 is arranged behind the intermediate portion 28, a front mount 30 and a rear mount. It is attached to the vehicle body 36 via 32.

The embodiment shown in FIG. 2 is a so-called parallel link type, and has two I-shaped suspension arms 22 at the front and rear.
Are arranged. Each suspension arm 2
The inner end of 2 is swingably connected to the suspension member 34, and the outer end of each suspension arm 22 is swingably connected to the wheel carrier 38. The outer end of the upper A-shaped suspension arm 40 is swingably connected to the wheel carrier 38, and the inner end of the suspension arm 40 is swingably connected to the vehicle body. As a result, the tire 20 is supported by the double wishbone type suspension. Although not shown in FIG. 2, the left tire also has
It is supported by a double wishbone type suspension.

Radius rod or strut bar 4
2 is swingably connected to the wheel carrier 38. The strut bar 42 extends forward from the wheel carrier 38 and is swingably connected to the vehicle body. Tire 20
The load in the front-rear direction applied to is received by the strut bar 42. On the other hand, the vertical load applied to the tire 20 is received by a shock absorber (not shown) and a coil spring. Therefore, a lateral force is mainly applied to the suspension member 34 from the suspension arm 22.

Front mount 30 and rear mount 32
Is provided with a rubber cushion known per se, but the illustration of this cushion is omitted. Normal,
Two front mounts 30 are provided on the left and right sides in front of the intermediate portion 28, and two rear mounts 32 are provided on the intermediate portion 2.
8 are arranged on the left and right side portions, respectively. These mounts are attached to the vehicle body by bolts penetrating the mounts and nuts (not shown) screwed into the bolts, and the suspension member 34 is connected to the vehicle body.

The front mount 30 is positioned so that its center of gravity in side view is on or near the suspension central axis S in side view.
Further, the rear mount 32 is positioned such that the center of gravity of the rear mount 32 is lower than the position of the front mount 30 when viewed from the side. In this case, as shown in FIG. 1, it is preferable to determine that the front mount 30 and the rear mount 32 are substantially positioned on the instantaneous central axis S of the suspension. The instantaneous central axis S of the suspension can be calculated as follows.

An instantaneous center A of the right suspension in a side view of the vehicle in a standard state of the vehicle is a line L ₁ connecting two connecting portions 41 of the upper suspension arm 40 on the vehicle body side.
And the extension L ₂ of the axis of the strut bar 42 are projected on the side projection plane 50, and the intersection point is obtained. next,
The instantaneous center B of the rear suspension of the right suspension in the standard state of the vehicle is the upper suspension arm 4
0 axis extension L ₃ and lower suspension arm 2
The extension line L ₄ of the axis line of 2 is projected on the front projection plane 52, and the intersection point is obtained. Then, a virtual plane 54 including these two instantaneous central axes A and B and the ground contact point C of the right tire 20 in the standard state of the automobile is obtained.

The instantaneous center D of the left suspension in a side view of the vehicle in the standard state of the automobile is a line L ₅ connecting the two connecting portions 41 of the upper suspension arm 40 on the vehicle body side.
And the extension line L ₆ of the axis of the strut bar 42 are projected on the side projection surface 56, and the intersection point is obtained. next,
The rear-view instantaneous center E of the left suspension in the standard state of the automobile is the upper suspension arm 4
0 axis extension L ₇ and lower suspension arm 2
The extension line L ₈ of the axis line of 6 is projected on the projection surface 52, and the intersection point is obtained. Then, a virtual plane 58 including these two instantaneous central axes D and E and the ground contact point F of the left tire 24 in the standard state of the automobile is obtained.

The instantaneous central axis S of the suspension is obtained as a line of intersection between the virtual plane 54 and the virtual plane 58. When the suspension member 34 receives a load only from the suspension arms 22 and 26, the load is directed to the suspension instantaneous central axis S. Suspension central axis S
Is always fluctuating as is clear from the above, but is uniquely determined when the vehicle is in the standard state, that is, when the vehicle is in the standard loading state. According to the present invention, in a standard state of an automobile, the position of the center of gravity of the front mount 30 in the side view is the suspension instantaneous center axis S in the side view.
Position so that it is on or near this, and
The rear mount 32 is positioned such that the center of gravity of the rear mount 32 is lower than the position of the front mount 30, and the rolling of the suspension member 34 is prevented or suppressed.

As a result of determining the positions of the front mount 30 and the rear mount 32 as described above, the rear mount 3
2 is located below the conventional rear mount 13 as shown in FIG. 1, and as shown in FIG.
It is located laterally outward of the vehicle body from 3. The reason why the rear mount 32 is located outside the conventional rear mount 13 is that the vehicle body 36 is a rear floor side member and extends straight from the connecting portion with the front mount 30. That is, in the illustrated embodiment, the position of the rear mount 32 can be brought as close as possible to the suspension instantaneous central axis S by extending the suspension member 34 downward and outward.

As shown in FIGS. 5 and 6, in the prior art, the offset O ₂ between the rear mount 13 and the suspension instantaneous central axis S was large, but in the present invention, the offset is substantially zero. Therefore, the total force f of the load f _r applied from the right tire 20 and the load f _l applied from the left tire 24 acts on the suspension central axis S, but in the present invention, the moment due to this total force is substantially zero. Become.

[Brief description of drawings]

FIG. 1 is a side view of an embodiment of a structure for mounting a suspension member on a vehicle body according to the present invention.

FIG. 2 is a right half perspective view schematically showing an embodiment of a structure for attaching a suspension member to a vehicle body according to the present invention.

FIG. 3 is a perspective view schematically showing an embodiment of an attachment structure of a suspension member to a vehicle body according to the present invention, and a suspension arm and a tire are shown in a projection view.

FIG. 4 is a plan view of an embodiment of a structure for attaching a suspension member to a vehicle body according to the present invention, showing the right half.

FIG. 5 is a schematic rear view showing the operation of the attachment structure of the suspension member to the vehicle body according to the present invention.

FIG. 6 is a side view of a conventional attachment structure of a suspension member to a vehicle body.

[Explanation of symbols]

 20, 24 Tires 22, 26 Suspension arm 28 Intermediate part 30 Front mount 32 Rear mount 40 Upper suspension arm 42 Strut bar

Claims (1)

[Claims] 1. An intermediate portion for swingably connecting a suspension arm for a right suspension supporting a right tire and a suspension arm for a left suspension supporting a left tire, respectively. A structure in which a front mount is arranged in the front and a suspension member in which a rear mount is arranged behind the middle part is attached to a vehicle body through the front mount and the rear mount, and a side surface of the right suspension in a standard state of an automobile. The instantaneous center of the left suspension in a standard state of the vehicle, where the first center is an imaginary plane including the instantaneous center of the right suspension, the rear center of the right suspension, and the ground contact point of the right tire. , The instantaneous center of the left suspension in rear view. And a virtual surface including the ground contact point of the left tire as a second surface, and a line of intersection of the first surface and the second surface as a suspension central axis line, the front mount in a side view. A position on the suspension instantaneous central axis in side view, or in the vicinity thereof, and a position of the rear mount in side view below the position of the front mount;
Mounting structure for the suspension member to the vehicle body.