JPH10287115A - Rear suspension device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress and prevent a compliance over-steering likely to be generated by the elastic bush of a trailing link, by a torsion beam type rear suspension. SOLUTION: While the axial line LB of an elastic bush 4 to connect a torsion beam 2 and a lateral link 5 is inclined at a specific angle αB to make the front part of a vehicle to the inner side, for example, the axial line LD of an elastic bush 7 to connect the torsion beam 2 and a control rod 8 is inclined at a specific angle αD larger than the angle αB, to make the front part of the vehicle to the inner side in the same way, and thereby, an elastic center O which consists of the intersection of the elastic force operating lines of two elastic bushes 4 and 7 is set at the more rear side of the vehicle than the axial line LT of the torsion beam 2, so as to generate a moment to toe-in a turning outer wheel when a lateral force is operated to the torsion beam 2. The axial line LD of the elastic bush 7 may be inclined to make the front part of the vehicle to the outer side. Or, it may be allowed that the inner walls of the outer tubes of the elastic bushes 4 and 7 are inclined in the same way.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rear suspension device for a vehicle in which right and left trailing links are connected by a torsion beam.

[0002]

2. Description of the Related Art Such a conventional rear suspension device is disclosed in, for example, JP-A-5-246223.

[0003] In the rear suspension device described in this conventional example, as shown in FIG. 12, a torsion beam 2 connecting left and right trailing links 1 is connected to a vehicle body by a lateral link 5 via elastic bushes 3 and 4. At the same time, by connecting the lateral link 5 and the torsion beam 2 with the control rod 8 via the elastic bushes 6 and 7, the lateral displacement (scuff) at the time of bounce is applied by applying the principle of the Scott Russell mechanism. And the lateral force at the time of turning can offset the force of jacking up the vehicle. Of course, sufficient lateral rigidity can be ensured by the lateral link 5 and the control rod 8, so that the rigidity required for struts such as shock absorbers is reduced, and consequently the suspension storage portion required for the vehicle body is reduced. The volume can be reduced.

[0004]

However, the above-mentioned conventional rear suspension device has the following problems.

[0005] That is, when the rear suspension device of the conventional example is shown in a plan view of the vehicle, it is as shown in FIG. Those illustrated, the axis L _C of the axis line L _L and the control rod 8 of the lateral link 5, but those arranged on the vehicle front than the axis L _T of the torsion beam 2, for example, right next to, as shown in FIG. 13 When the force F is input, for example, the compliance of the elastic bush 13 that connects the trailing link 1 to the vehicle body member, that is, the bending, causes the entire rear suspension device to rotate counterclockwise in the drawing, and the rear left wheel as the turning outer wheel A so-called lateral force compliance toe-out occurs, and the lateral force compliance steer tends to be on the oversteer side.

The present invention has been developed in view of these problems, and has as its object to provide a rear suspension device capable of suppressing and suppressing lateral force compliance oversteer which tends to occur in a torsion beam type rear suspension. It is.

[0007]

In order to achieve the above object, a rear suspension device according to a first aspect of the present invention is a rear suspension device having a trailing link swingably connected to a vehicle body member on both sides in a vehicle width direction. The rear end is connected by a torsion beam disposed substantially in the vehicle width direction, and one end of a lateral link disposed substantially in the vehicle width direction is swingably connected to the torsion beam via an elastic bush. Along with
The other end of the lateral link is swingably connected to a vehicle body member via an elastic bush, and one end of a control rod disposed substantially in the vehicle width direction on the torsion beam is swung through the elastic bush. An elastic bush interposed between the lateral link and the torsion beam in a rear suspension device movably connected and the other end of the control rod swingably connected to the lateral link via an elastic bush. Axis,
And, by inclining the axis of the elastic bush interposed between the control rod and the torsion beam from the vehicle front-rear direction in a vehicle plan view, passing through a substantial connection point between the lateral link and the torsion beam by the elastic bush and The intersection point of a straight line orthogonal to the axis of the elastic bush in a plan view of the vehicle and a straight line passing through a substantial connection point between the control rod and the torsion beam by the elastic bush and orthogonal to the axis of the elastic bush in a plan view of the vehicle. The torsion beam is set rearward of the vehicle with respect to the axis of the torsion beam.

According to a second aspect of the present invention, there is provided the rear suspension device according to the first aspect, wherein the axis of the elastic bush interposed between the lateral link and the torsion beam is aligned with the vehicle plane. The front of the vehicle is inclined by a predetermined angle so that the front of the vehicle is inward in the width direction of the vehicle, and the axis of the elastic bush interposed between the control rod and the torsion beam is directed outward in the width direction of the vehicle in plan view of the vehicle. It is characterized by being inclined by a predetermined angle so that

According to a third aspect of the present invention, there is provided a rear suspension device according to the first aspect, wherein an axis of an elastic bush interposed between the lateral link and the torsion beam is aligned with a vehicle plane. The front of the vehicle is inclined by a predetermined angle so that the front of the vehicle is inward in the width direction of the vehicle, and the axis of the elastic bush interposed between the control rod and the torsion beam is positioned inward of the front of the vehicle in the width direction of the vehicle in plan view. The angle of the elastic bush interposed between the control rod and the torsion beam is set to be larger than the angle of inclination of the elastic bush interposed between the lateral link and the torsion beam. It is characterized by the following.

According to a fourth aspect of the present invention, there is provided the rear suspension device according to the third aspect, wherein the elastic bush passes through a substantially connecting point between a lateral link and a torsion beam and is connected to a vehicle plane. The intersection of a straight line that is perpendicular to the axis of the elastic bush as viewed, and a straight line that passes through a substantial connection point between the control rod and the torsion beam by the elastic bush and that is orthogonal to the axis of the elastic bush in vehicle plan view,
It is characterized by being arranged on the vehicle center line corresponding to the center in the vehicle width direction.

In the rear suspension device according to a fifth aspect of the present invention, a rear end of a trailing link swingably connected to a vehicle body member on both sides in the vehicle width direction is disposed substantially in the vehicle width direction. One end of a lateral link disposed substantially in the vehicle width direction is connected to the torsion beam via a resilient bush so as to be swingable, and the other end of the lateral link is elastically connected to the torsion beam. A control rod, which is swingably connected to a body member via a bush, and one end of a control rod disposed substantially in the vehicle width direction is connected to the torsion beam via a resilient bush. In the rear suspension device in which the other end of the control rod is swingably connected to the lateral link via an elastic bush, an axis of the control rod and The axis of the literal link, is characterized in that both disposed rearward from the axis of the torsion beam.

In the rear suspension device according to a sixth aspect of the present invention, in the rear suspension according to the fifth aspect, the axis of the elastic bush interposed between the lateral link and the torsion beam is viewed in a plan view of the vehicle. And the axis of the elastic bush interposed between the control rod and the torsion beam is set so that the front of the vehicle is outward in the width direction of the vehicle in a plan view of the vehicle. As described above, it is characterized by being inclined by a predetermined angle.

In the rear suspension device according to a seventh aspect of the present invention, in the rear suspension according to the fifth aspect, the axis of the elastic bush interposed between the lateral link and the torsion beam is viewed in a plan view of the vehicle. And the axis of the elastic bush interposed between the control rod and the torsion beam is set so that the front of the vehicle is inward in the vehicle width direction when viewed from the top of the vehicle. In this manner, the inclination angle of the elastic bush interposed between the control rod and the torsion beam is set to be larger than the inclination angle of the elastic bush interposed between the lateral link and the torsion beam. It is characterized by the following.

The rear suspension device according to claim 8 of the present invention is the rear suspension device according to claim 7, wherein the vehicle passes through a substantial connection point between a lateral link and a torsion beam by the elastic bush and is in a vehicle plane. The intersection of a straight line that is perpendicular to the axis of the elastic bush as viewed, and a straight line that passes through a substantial connection point between the control rod and the torsion beam by the elastic bush and that is orthogonal to the axis of the elastic bush in vehicle plan view,
It is characterized by being arranged on the vehicle center line corresponding to the center in the vehicle width direction.

According to a ninth aspect of the present invention, in the rear suspension device according to the first aspect of the present invention, when the axis of the elastic bush is inclined, the inner wall of the outer cylinder of each elastic bush is fixed to the predetermined position. By inclining by a predetermined angle in the direction, the substantial axis of the elastic force of the elastic bush is inclined.

[0016]

As described above, according to the rear suspension apparatus of the present invention, the axis of the elastic bush interposed between the lateral link and the torsion beam, and the control rod and the torsion beam are provided. By inclining the axis of the elastic bush interposed between the torsion beam and the lateral link of the elastic bush in a plan view of the vehicle, the elastic bush passes through a substantial connection point between the lateral link and the torsion beam by the elastic bush. The elastic center of the rear suspension, comprising the intersection of a straight line perpendicular to the axis of the bush and a straight line passing through a substantial connection point between the control rod and the torsion beam by the elastic bush and orthogonal to the axis of the elastic bush in a plan view of the vehicle. Was set to the rear of the vehicle from the axis of the torsion beam. Even when the entire suspension rotates counterclockwise in a plan view of the vehicle as a result of the input of a rightward lateral force and a toe-out occurs on the turning outer wheel, the suspension including the torsion beam is centered on the elastic center of the suspension. A clockwise rotation moment is generated in each component, and this clockwise moment prevents toe-out of the turning outer wheel, thereby preventing lateral force compliance oversteer.

According to the rear suspension device of the present invention, the axis of the elastic bush interposed between the lateral link and the torsion beam is set so that the front of the vehicle is inward in the vehicle width direction when the vehicle is viewed in plan. The elastic bush interposed between the control rod and the torsion beam is inclined by a predetermined angle so that the front of the vehicle is outward in the vehicle width direction in a plan view of the vehicle. A straight line passing through a substantial connection point between the link and the torsion beam and perpendicular to the axis of the elastic bush between them, and a straight line passing through the substantial connection point between the control rod and the torsion beam and perpendicular to the axis of the elastic bush therebetween The center of elasticity consisting of the intersection with the straight line can be set to the rear of the vehicle from the axis of the torsion beam. Against Ryan Storr out,
By generating a reverse moment in the suspension, lateral force compliance oversteer can be reliably suppressed and prevented.

Further, according to the rear suspension device of the present invention, the axis of the elastic bush interposed between the lateral link and the torsion beam is set such that the front of the vehicle is inward in the vehicle width direction when the vehicle is viewed in plan. And the axis of the elastic bush interposed between the control rod and the torsion beam is inclined by a predetermined angle so that the front of the vehicle is inward in the vehicle width direction when viewed from the top of the vehicle. Since the inclination angle of the elastic bush interposed between the rod and the torsion beam is set to be larger than the inclination angle of the elastic bush interposed between the lateral link and the torsion beam, the elastic center of the suspension is positioned rearward of the vehicle from the axis of the torsion beam. Can be set for lateral force compliance toe-out, suspend The lateral force compliance over steer can be prevented reliably suppressed by generating a moment opposite to ® down.

According to the rear suspension device of the present invention, the straight line passes through the substantial connection point between the lateral link and the torsion beam and is orthogonal to the axis of the elastic bush between them in the plan view of the vehicle. And, since the intersection of a straight line that passes through the substantial connection point of the control rod and the torsion beam and is orthogonal to the axis of the elastic bush between the two in the vehicle plan view is arranged on the vehicle center line corresponding to the center in the vehicle width direction, The elastic center of the suspension consisting of the intersection of both straight lines will be located on the vehicle center line,
As a result, the magnitude of the movement or displacement of the suspension of the left and right wheels generated by the rightward lateral force and the leftward lateral force can be matched or substantially matched, so that both ends of the suspension such as a wheel house can be easily designed. Become.

Further, according to the rear suspension device of the present invention, since the axis of the control rod and the axis of the lateral link are both arranged behind the axis of the torsion beam, the lateral link between the lateral link and the torsion beam is provided. From the intersection of a straight line passing through the substantial connection point and orthogonal to the axis of the elastic bush therebetween and a straight line passing through the substantial connection point between the control rod and the torsion beam and orthogonal to the axis of the elastic bush therebetween The elastic center of the suspension is set to the rear of the vehicle from the axis of the torsion beam even if the axis of each elastic bushing is aligned or substantially aligned with the longitudinal direction of the vehicle. As a result, the entire suspension rotates counterclockwise in plan view of the vehicle and turns Even in cases where toe-out occurs, a clockwise rotating moment is generated in each component of the suspension including the torsion beam around the elastic center of the suspension, and this clockwise moment prevents the towing of the turning outer wheel from being suppressed. Therefore, it is possible to prevent the lateral force compliance oversteer from being suppressed.

According to the rear suspension device of the present invention, in the rear suspension according to the fifth aspect, the axis of the elastic bush interposed between the lateral link and the torsion beam is aligned with the vehicle plane. The axis of the elastic bush interposed between the control rod and the torsion beam is tilted by a predetermined angle so that the front of the vehicle is inward in the vehicle width direction when viewed, and the front of the vehicle is outward in the vehicle width direction when viewed in plan view of the vehicle. As a result, the suspension center of elasticity is set to the rear of the vehicle more reliably than the torsion beam, and a lateral force compliance oversteer is ensured by generating an opposite moment to the suspension against the lateral force compliance toe-out. Can be prevented.

According to a seventh aspect of the present invention, in the rear suspension according to the fifth aspect, the axis of the elastic bush interposed between the lateral link and the torsion beam is aligned with the vehicle plane. The front of the vehicle is inclined by a predetermined angle so that the front of the vehicle is inward in the width direction of the vehicle, and the axis of the elastic bush interposed between the control rod and the torsion beam is inward in the width direction of the vehicle in plan view of the vehicle. As described above, the inclination angle of the elastic bush interposed between the control rod and the torsion beam is set to be larger than the inclination angle of the elastic bush interposed between the lateral link and the torsion beam. The center of elasticity is set more securely behind the vehicle than the torsion beam, and Against Ryan Storr out,
By generating a reverse moment in the suspension, lateral force compliance oversteer can be reliably suppressed and prevented.

According to the rear suspension device of the present invention, in the rear suspension according to the present invention, the elastic bush passes through a substantial connection point between the lateral link and the torsion beam and between the two. The intersection of a straight line perpendicular to the axis of the vehicle in a plan view and a straight line passing through a substantial connection point between the control rod and the torsion beam and perpendicular to the axis of the elastic bush between the two in a vehicle plan view is defined as the center of the vehicle width direction. Is located on the vehicle center line, the center of elasticity of the suspension consisting of the intersection of the two straight lines is located on the vehicle center line, and as a result, the right and left side forces generated by the rightward lateral force and the leftward lateral force Since the magnitude of movement or displacement of the suspension can be matched or substantially matched with the size of the suspension, Part design becomes easy.

Further, according to the rear suspension device of the present invention, for example, instead of directly inclining the axis of the inner cylinder or the like of the elastic bush, the elastic bush in which the inner wall of the outer cylinder is inclined is used. By making the inclination direction coincide with the predetermined direction described in each of the above-mentioned inventions, the axis of action of the substantial elastic force of the elastic bush, that is, the direction of bending can be inclined, so that the elastic center can be set at a desired position. Position, and the axis of the outer cylinder of the outer cylinder of the elastic bush and the axis of the inner cylinder can coincide or substantially coincide with, for example, the longitudinal direction of the vehicle. Similarly, it is possible to prevent the suppression of the lateral force compliance oversteer as described above.

[0025]

Embodiments of the present invention will be described below with reference to the drawings. Here, a description will be given of a rear suspension device of the present invention implemented on the rear wheels of a front-engine front-wheel drive vehicle.

FIG. 1 is a perspective view showing a rear suspension according to a first embodiment of the present invention. In FIG. 1, reference numeral 1 denotes an open front end having an elastic bush 13 at both ends in the vehicle width direction. Is a trailing link swingably connected to a vehicle body member (not shown), and a rear end thereof is fixedly connected by a torsion beam 2 arranged substantially in the vehicle width direction. Wheel support members 9 for rotatably supporting the rear left and right wheels are provided at both ends of the torsion beam 2.
Is installed. The wheel support member 9 includes
A lower end input point of a strut 12 in which the shock absorber 10 and the coil spring 11 are disposed substantially coaxially is connected, and an upper end thereof is connected to a body member (not shown).

Further, leftward end of the torsion beam 2, the upper portion of the rear right wheel side end portion that is, via an elastic bushing 4 axis L _B is inclined as described below, the axis of the torsion beam 2 a slightly vehicle front than L _T, also the right end of the lateral link 5 arranged Ryakusha width direction is swingably connected. The left end of the lateral link 5 is swingably connected to a body member (not shown) via the elastic bush 3 near the center of the torsion beam 2. The central portion of the lateral link 5 is greatly extended vertically by a ring-shaped member 5a juxtaposed in the front and rear of the vehicle, and the ring-shaped member 5a has a hole 5b penetrating in the front and rear.

[0028] Then, the hole portion 5b of the central portion the ring-shaped member 5a of the lateral link 5, also the control rod 8 disposed substantially vehicle width direction than in the vehicle front axis L _T of the torsion beam 2 is furnished I have. The left end of the control rod 8 in the figure, that is, the rear right wheel end,
The lateral rod 5 is swingably connected to a ring-shaped member 5 a of the lateral rod 5 via an elastic bush 6. The right end of the control rod 8 is swingably connected to the torsion beam 2 via an elastic bush 7 whose axis L _D is inclined as described later.

That is, one end of the torsion beam 2 connecting the rear left and right wheels is swingably connected to a substantially central portion of the vehicle body member by the lateral link 5, and the lateral link 5 and the torsion beam 2 are connected to each other. A swingable control rod 8 is bridged between them. As a result, when the left and right wheels bounce simultaneously,
The principle of the Scott Russell mechanism works to prevent lateral displacement (scuff). Also, with the lateral link 5 alone, the lateral force at the time of turning will jack up the vehicle,
It can also be offset by the principle of the Scott Russell mechanism via the control rod 8. Of course,
It is possible to optimize the camber angle to the ground when the vehicle rolls, or to control the lateral link 5 or the control rod 8
As a result, sufficient lateral rigidity can be ensured, so that the rigidity required for the struts 12 such as the shock absorber 10 is reduced, and, for example, the suspension storage portion required for the vehicle body side, for example, overhang to the trunk room, etc. Volume can be reduced.

FIG. 2 shows this torsion beam type rear suspension in a plan view of the vehicle. The elastic bushes 3, 4, 6, and 7 interposed between the above-mentioned links are very common in which a so-called outer cylinder and an inner cylinder are arranged coaxially and an elastic member such as rubber is interposed between the two. Since there is no operation for providing elasticity to have a strong or weak directionality by providing a grinder or the like, the axis of the outer cylinder or the inner cylinder is aligned with the axis of the substantial elastic force of the elastic bush ( Hereinafter, simply referred to as the axis of the elastic bush). For example, the elastic bush 3 used at the connection point between the torsion beam 2 and the lateral link 5 and the elastic bush 6 used at the connection point between the lateral link 5 and the control rod 8 have their axes aligned with the front and rear of the vehicle as in the prior art. although What match or substantially match the direction, in this embodiment, the lateral link 5 and the axis L _B of the elastic bush 4 which is interposed between the torsion beam 2, the front of the vehicle in the vehicle width when the vehicle is viewed in a plane together is inclined at a predetermined angle alpha _B so that the inward, the axis L _D of the elastic bushing 7 which is interposed between the control rod 8 and the torsion beam 2, the front of the vehicle to the inner side in the vehicle width direction in a plan view of the vehicle Angle α _D
And the inclination angle α _D of the elastic bush 7 interposed between the control rod 8 and the torsion beam 2 is changed to the lateral link 5 and the torsion beam 2.
It is set larger than the inclination angle alpha _B of the elastic bush 4 which is interposed between the.

Next, the operation of the rear suspension device of this embodiment will be described. The rear suspension device of the present embodiment having the above configuration is an embodiment of the invention according to claims 1 and 3 of the present invention. The lateral link 5 is connected to the vehicle body member via the elastic bush 3 at a substantial connection point A, and the lateral link 5 and the torsion beam 2 are substantially connected to each other via the elastic bush 4 at a connection point B. They are connected by dots. The control rod 8 is connected to the lateral link 5 at a substantial connection point C via the elastic bush 6, and at the same time, the substantial connection point D is connected to the torsion beam 2 via the elastic bush 7.
They are connected by dots. In this embodiment, the axis L _L of the lateral link 5 and the axis L _{L of the} control rod 8 are set.
_C is located in front of the vehicle by a distance D ₀ from the axis of the torsion beam 2. For example, the center point at which the torsion beam 2 is displaced by the bending deformation of each elastic bush when the lateral force F acts on the torsion beam 2 passes through the substantial connection point B between the lateral link 5 and the torsion beam 2 and between them. intersection of a straight line perpendicular to the axis L _B of the elastic bushing 4, a straight line perpendicular to the axis L _D of the elastic bushing 7 between substantive through the connection point D point and both the lateral link 5 and the control rod 8 of It is in. This is defined as the elastic center O of the suspension.

[0032] When defining the elastic center of the thus suspension, in the present embodiment, the axis L _B of the elastic bush 4 which is interposed between the lateral link 5 and the torsion beam 2, the front of the vehicle drive when the vehicle is viewed in a plane by a predetermined angle alpha _B such that the widthwise inwardly tilted, and the control rod 8 and the axis L _D of the elastic bushing 7 which is interposed between the torsion beam 2, the front of the vehicle inner side in the vehicle width direction in plan view of the vehicle It is inclined by a predetermined angle alpha _D so that, and interposed inclination angle alpha _D of the elastic bushing 7 which is interposed between the control rod 8 and the torsion beam 2, between the lateral link 5 and the torsion beam 2 for you are set larger than the inclination angle alpha _B of the elastic bushing 4 that is, elastic center O of the rear suspension to be set from them, at least Axis L _T of Activation beam 2
Only more distance D ₁ is set to the rear of the vehicle.

As described above, when, for example, a rightward lateral force F acts on the torsion beam type rear suspension, the compliance of the elastic bush 13 for connecting the trailing link 1 to the vehicle body member, that is, bending deformation causes the entire suspension to react. When rotated clockwise, the turning outer wheel, that is, the rear left wheel, changes in the toe-out direction, and the lateral force compliance oversteer tends to occur. However, the elastic center O of the suspension is the torsion beam 2
Center if there than the vehicle rear axis L _T, for example also act lateral force F of the right as shown, in a direction opposite to the arrow direction in FIG. 14 to be described later, the elastic center O to the torsion beam 2 As a result, a moment in the direction of arrow a acts clockwise, and the turning outer wheel, that is, the rear left wheel, tries to toe in (this is also a lateral force compliance steer).

Therefore, when the same lateral force F acts, the elastic bush 1 connecting the trailing link 1 to the vehicle body member.
The amount of change in the toe angle of the turning outer wheel in the toe-out direction of the turning left wheel in the toe-out direction due to the bending displacement of the rear wheel 3 is δ ₀ , If the angle change is set to δ ₁ and both are superimposed and displayed in FIG. 3, the lateral force compliance oversteer is suppressed by the toe angle change δ _{1 in the} toe-in direction. Further, if the rigidity of the elastic bush connecting the trailing link to the vehicle body member is sufficiently high, it is possible to completely cancel the lateral force compliance oversteer, and furthermore, it is possible to set this in the understeer direction. . In any case, the stability of the vehicle when turning is improved.

Incidentally, the torsion beam 2
FIG case axis L _T is in the rear of the vehicle than the axis line L _C of the axis line L _L and the control rod 8 of the lateral link 5, the axis of each elastic bushing, to match all the vehicle longitudinal direction or substantially longitudinal direction of the It is shown in FIG. In this case, the center of elasticity O of the rear suspension is substantially equal to the point B between the lateral link 5 and the torsion beam 2 and the substantial connection point D between the lateral link 5 and the control rod 8.
It exists on a straight line connecting the points, that is, on the axis lines L _L and L _{C of the} lateral link 5 and the control rod 8 (the position of the elastic center is determined according to the rigidity balance of the two elastic bushes). However, the axis L _L of the lateral link 5 and the control rod 8, L _C, i.e. elastic center O of the suspension, the axis L _T of the torsion beam 2, for example, the distance D ₀ only because ahead of the vehicle, for example, as in FIG. 14 When a rightward lateral force F is input, a moment acts on the entire suspension about the elastic center O in a counterclockwise direction indicated by an arrow b. This moment further promotes the compliance of the elastic bushing 13 connecting the trailing link 1 to the vehicle body member, that is, the lateral force compliance toe-out due to bending, and further tow out the rear left wheel, which is the turning outer wheel, against the lateral force compliance oversteer. In this case, oversteering is synergistic.

Next, a rear suspension according to a second embodiment of the present invention will be described with reference to FIG. After the second embodiment, the same reference numerals are given to constituent members equivalent to those of the above-described first embodiment, substantial connection points between members, elastic centers, and the like, and detailed descriptions thereof are given. I omit the explanation.

In this embodiment, the lateral link 5
Elastic bush 4 interposed between the torsion beam 2
Axis L of_BIn front of the vehicle in the vehicle width direction
Angle α_BThe control
Interposed between the roll rod 8 and the torsion beam 2
Axis L of elastic bush 7_DIn front of the vehicle
Predetermined angle α to be outside in the vehicle width direction_DJust tilt
I have. That is, the rear suspension device of the present embodiment
Is an embodiment of the invention according to claims 1 and 2 of the present invention.
It is configured as a state. As a result, the lateral
The substantial connection point B between the link 5 and the torsion beam 2 is
Axis L of the elastic bush 4 passing through and between them _BOrthogonal to
Between the straight line, the lateral link 5 and the control rod 8
The elastic bush 7 which passes through the substantial connection point D and is between them
Axis L of_DCenter of elasticity O consisting of the intersection with a straight line perpendicular to
Is the axis L of the torsion beam 2_TAbove or slightly above
Set behind the vehicle. Therefore, compared to the first embodiment,
When the lateral force F acts for the short moment arm
Arrow that changes the turning outer wheel (rear left wheel) in the toe-in direction
The moment in the a direction is small, but at least
Assist lateral force compliance oversteer as shown in Fig. 14.
It won't be long. Of course, each elastic bush 4,7
Predetermined inclination angle α_B, Α_DIs larger than that shown
If set, the elastic center O is set further to the rear of the vehicle.
To extend the moment arm and toy the turning outer wheel
Increase the moment in the direction of arrow a
It is possible to do.

Next, a rear suspension according to a third embodiment of the present invention will be described with reference to FIG. Axis L _B of the elastic bush 4 which is interposed between said lateral link 5 and the torsion beam 2 in this embodiment, and the inclination of the axis L _D of the elastic bushing 7 which is interposed between the control rod 8 and the torsion beam 2 The direction is the same as that of the first embodiment, and the front of the vehicle is inward in the vehicle width direction when viewed in a plan view of the vehicle (however, α _D > α _B ). predetermined angle alpha _B, by devising the alpha _D, and the straight line perpendicular to the axis L _B of the elastic bushing 4 between substantially passes through the connection point B point and both the lateral link 5 and the torsion beam 2, lateral link 5 the elastic center O of the suspension consisting of the intersection of the straight line perpendicular to the axis L _D of the elastic bushing 7 between substantive through the connection point D point and both the control rod 8 and, Tosho Slightly vehicle rear than the axis L _T by the distance D ₁ of the Nbimu 2, is set on the vehicle center line L ₀ in the vehicle width direction center. That is, the rear suspension device of the present embodiment
The present invention is configured as an embodiment of the invention according to claims 1, 3 and 4. Therefore, when a lateral force acts on the torsion beam 2, as in the first embodiment, a moment acts on the elastic center O in the direction of the arrow a, and the torsion beam 2 tends to be rotationally displaced. setting the elastic center O on the vehicle center line L ₀ as the rotation displacement of the torsion beam 2 being equal magnitude of the lateral force from the left and right is on the left and right equivalent, thus for example the toe of the wheels required for wheel house The design of the wheel house becomes easy, for example, the angle change amount may be considered the same for the left and right.

Next, a rear suspension according to a fourth embodiment of the present invention will be described with reference to FIG. This embodiment is
Unlike the embodiments described above, the axis of the elastic bushes 7 which is interposed between the axis L _B, and the control rod 8 and the torsion beam 2 of elastic bushing 4 which is interposed between said lateral link 5 and the torsion beam 2 L _D
In each case, they are matched in the vehicle front-back direction. However, the embodiments described above, the axis L _C of the axis line L _L and the control rod 8 of the lateral links 5, even that both are of the axis L _T of the torsion beam 2 is set to backward different. That is, the rear suspension device of the present embodiment is configured as an embodiment of the invention according to claim 5 of the present invention. The axis L _B of the elastic bush 4 interposed between the lateral link 5 and the torsion beam 2 and the axis L _D of the elastic bush 7 interposed between the control rod 8 and the torsion beam 2 as described above. When the vehicle is also made to coincide with the vehicle longitudinal direction, the elastic center O of the suspension is on a straight line connecting the former substantial connection point B and the latter substantial connection point D, that is, the control rod 8 and the lateral link 5. Exist on the axis L _L , L _C. However, the axis L _C and the axis L _L of the lateral link 5 of the control rod 8, that are laid in the vehicle backward by the axis L _T than the distance D ₁ of the torsion beam 2 (= D _0), the elasticity of the suspension center O because would also rearwardly a distance L ₁ from the axis L _T of the torsion beam 2, as well as other embodiments described above, the lateral force F acts on the torsion beam 2, the elastic center O
And a moment in the direction of the arrow a acts around the center, and the compliance of the elastic bush 13 for connecting the trailing link 1 to the vehicle body member, that is, the lateral force compliance oversteer due to the bending deformation is suppressed and prevented.

Next, a rear suspension according to a fifth embodiment of the present invention will be described with reference to FIG. This embodiment is
The axial line L _L of the lateral link 5 as in the fourth embodiment.
And the axis L _C of the control rod 8, both in suspension laid rearward from the axis L _T of the torsion beam 2, and further interposed between the lateral link 5 and the torsion beam 2 as in the first embodiment The axis L _B of the elastic bush 4 and the axis L _D of the elastic bush 7 interposed between the control rod 8 and the torsion beam 2 are respectively set at predetermined angles α _B and α _D.
Each of them is inclined so that the front of the vehicle is inward in the vehicle width direction when viewed from the top of the vehicle (however, α _D > α _B ). That is, the rear suspension device of the present embodiment is configured as an embodiment of the invention according to claims 5 and 7 of the present invention. Therefore, for example, the inclination predetermined angles α _B , α
_D is even equivalent to that of the first embodiment, in advance axis L _C of the axis line L _L and the control rod 8 of the lateral link 5 by the amount in the rear of the vehicle than the axis line L _T of the torsion beam 2, corresponds to the moment arm distance D ₁ of the the torsion beam 2 to elastic center O to longer. Therefore, a larger moment in the direction of arrow a centering on the elastic center O acts on the equivalent lateral force F acting on the torsion beam 2, and the elastic force for connecting the trailing link 1 to the vehicle body member. The compliance of the bush 13, that is, the lateral force compliance oversteer due to the bending deformation is suppressed and prevented.

Next, a rear suspension according to a sixth embodiment of the present invention will be described with reference to FIG. This embodiment is
The axial line L _L of the lateral link 5 as in the fourth embodiment.
And the axis L _C of the control rod 8, both in suspension laid rearward from the axis L _T of the torsion beam 2, and further interposed between the lateral link 5 and the torsion beam 2 as in the second embodiment the axis L _B of the elastic bush 4, the vehicle front is inclined by a predetermined angle alpha _B so that the vehicle width direction inner side in plan view of the vehicle, the elastic bushing 7 and is interposed between the control rod 8 and the torsion beam 2 the axis L _D of, is inclined by a predetermined angle alpha _D so that the vehicle ahead is on the outside in the vehicle width direction in a plan view of the vehicle. That is, the rear suspension device according to the present embodiment is the fifth or sixth aspect of the present invention.
As an embodiment of the present invention. Therefore,
For example, even if the predetermined inclination angles α _B and α _D are equal to those of the second embodiment, the axis L of the lateral link 5 is previously determined.
Axis L _{C L} and the control rod 8 by an amount in the rear of the vehicle than the axis line L _T of the torsion beam 2, elastic center O of the torsion beam 2 which corresponds to the moment arm
Distance D ₁ of until long. Therefore, a larger moment acting in the direction of arrow a centering on the elastic center O acts on the equivalent lateral force F acting on the torsion beam 2, and the elastic force for connecting the trailing link 1 to the vehicle body member. The compliance of the bush 13, that is, the lateral force compliance oversteer due to the bending deformation is suppressed and prevented.

Next, a rear suspension according to a seventh embodiment of the present invention will be described with reference to FIG. This embodiment is
The axis of the elastic bushing 4 which is interposed between the lateral link 5 and the torsion beam 2 in the fifth embodiment L _B
Inclination predetermined angle alpha _B, and by devising the inclination predetermined angle alpha _D axis L _D of the elastic bushing 7 which is interposed between the control rod 8 and the torsion beam 2, the suspension as the third embodiment of the the elastic center O is set on the vehicle width direction center of the vehicle center line L _0. That is,
The rear suspension device of the present embodiment is configured as an embodiment of the invention according to claims 5, 7 and 8 of the present invention. Therefore, not only the lateral force compliance oversteer for the equivalent lateral force F acting on the torsion beam 2 is not suppressed, but also if the magnitude of the lateral force from the left and right is equal, the rotational displacement of the torsion beam 2 becomes equal to the left and right. The design of the wheel house is facilitated, for example, the amount of change in the toe angle of the wheel required for the wheel house may be considered the same for the left and right.

Next, another embodiment in which the invention according to claim 9 of the present invention is implemented will be described with reference to FIGS.
1 will be described. In each of the above embodiments except the fourth embodiment, for example, as shown in FIG.
The elastic bushes 4 and 7 in which the inner cylinder 4 and the inner cylinder 15 are coaxial are interposed between the torsion beam 2 and the lateral link 5 while being inclined in the predetermined direction by the predetermined angles α _B and α _D as described above. Are connected, or both are connected so as to be interposed between the torsion beam 2 and the control rod 8 as shown in FIG. 11A. However, in such a connection structure, the mounting structure of all the elastic bushes of each member must be changed. So, for example, FIG.
The inner wall of the outer tube 14 of the elastic bushing 4, as shown in, is inclined at a predetermined angle alpha _B in a predetermined direction described above, the outer wall and the inner cylinder 15 itself of the outer tube 14 is made to coincide in the longitudinal direction of the vehicle, and torsion beam 2 Even if the lateral link 5 is connected, FIG.
The effect is as if a is tilted axis L _B directly as 0a.

That is, the direction in which the elastic force effectively acts on the elastic bush 4 in FIG. 10B is the same as that in FIG. 10A. Therefore, the elastic center O of the suspension is connected to the torsion beam 2 and the lateral link by the elastic bush 4. 5 on a straight line that passes through a substantial connection point B and is perpendicular to the direction of inclination of the inner wall of the outer cylinder 14. Further, for example, the inner wall of the outer tube 14 of the elastic bushing 7 as shown in FIG. 11b, is inclined at a predetermined angle alpha _D in a predetermined direction described above, the outer cylinder 1
The outer wall of 4 and the inner cylinder 15 themselves are aligned in the vehicle front-rear direction,
Connecting the torsion beam 2 and the control rod 8 has the same effect as the case where the axis L _D is directly inclined as shown in FIG. 11A. In other words, the direction in which the elastic force effectively acts on the elastic bush 7 in FIG. 11B is the same as that in FIG.
Exists on a straight line that passes through a substantial connection point D between the torsion beam 2 and the control rod 8 by the elastic bush 7 and is orthogonal to the inclination direction of the inner wall of the outer cylinder 14. Therefore, in this way, the lateral force compliance oversteer can be prevented and suppressed as described above, and the mounting structure of the torsion beam 2 and the lateral link 5 and the torsion beam 2 and the control rod can be changed only by changing the shape of the elastic bushes 4 and 7. There is also an advantage that the mounting structure itself with 8 does not need to be changed, and it is easy to implement by that much.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a first embodiment of a rear suspension device of the present invention.

FIG. 2 is a plan view of the rear suspension device of FIG.

FIG. 3 is an operation explanatory view of the rear suspension device of FIG. 1;

FIG. 4 is a plan view showing a second embodiment of the rear suspension device of the present invention.

FIG. 5 is a plan view showing a third embodiment of the rear suspension device of the present invention.

FIG. 6 is a plan view showing a fourth embodiment of the rear suspension device of the present invention.

FIG. 7 is a plan view showing a fifth embodiment of the rear suspension device of the present invention.

FIG. 8 is a plan view showing a rear suspension device according to a sixth embodiment of the present invention.

FIG. 9 is a plan view showing a rear suspension device according to a seventh embodiment of the present invention.

FIG. 10 is an explanatory diagram of a connecting portion between a torsion beam and a lateral link, showing another embodiment of the rear suspension device of the present invention.

FIG. 11 is an explanatory view of a connecting portion between a torsion beam and a control rod, showing another embodiment of the rear suspension device of the present invention.

FIG. 12 is a perspective view showing an example of a conventional rear suspension device.

FIG. 13 is an operation explanatory view of the rear suspension device of FIG. 12;

14 is a plan view of the rear suspension device of FIG.

[Explanation of symbols]

1 is a trailing link 2 is a torsion beam 3 is an elastic bush 4 is an elastic bush 5 is a lateral link 6 is an elastic bush 7 is an elastic bush 8 is a control rod 9 is a wheel support member 10 is a shock absorber 11 is a coil spring 12 is a strut member 13 elastomeric bushing 14 is the outer tube L _B is the axis L _D is the axis L _T is the axis L _L is the axis L _C is the axis alpha _B of the control rod tilted a predetermined angle alpha _D of the lateral links of the torsion beam elastic bushing elastomeric bushing A predetermined inclination angle A is a substantial connection point between the lateral link and the body member B is a substantial connection point between the lateral link and the torsion beam C is a substantial connection point between the control rod and the lateral link D is a control rod and the torsion beam O is a suspension point Elastic center of

Claims (9)

[Claims] 1. A rear end portion of a trailing link swingably connected to a vehicle body member on both sides in a vehicle width direction is connected by a torsion beam disposed substantially in a vehicle width direction. One end of a lateral link arranged in the direction is swingably connected via an elastic bush, and the other end of the lateral link is swingably connected to a vehicle body member via an elastic bush, One end of a control rod disposed substantially in the vehicle width direction is swingably connected to the torsion beam via an elastic bush, and the other end of the control rod is connected to the lateral link via an elastic bush. A rear suspension device swingably connected to the axial line of an elastic bush interposed between the lateral link and the torsion beam;
And, by inclining the axis of the elastic bush interposed between the control rod and the torsion beam from the vehicle front-rear direction in a vehicle plan view, passing through a substantial connection point between the lateral link and the torsion beam by the elastic bush and The intersection point of a straight line orthogonal to the axis of the elastic bush in a plan view of the vehicle and a straight line passing through a substantial connection point between the control rod and the torsion beam by the elastic bush and orthogonal to the axis of the elastic bush in a plan view of the vehicle. A rear suspension device set at a position rearward of the vehicle relative to the axis of the torsion beam. 2. An axial line of an elastic bush interposed between the lateral link and the torsion beam is inclined by a predetermined angle so that the front of the vehicle is inward in the vehicle width direction in a plan view of the vehicle, and the control rod and the torsion beam are inclined. 2. The rear suspension device according to claim 1, wherein the axis of the elastic bush interposed between the front suspension and the rear suspension is inclined by a predetermined angle so that the front of the vehicle is outward in the vehicle width direction when viewed in a plan view of the vehicle. 3. An axial line of an elastic bush interposed between the lateral link and the torsion beam is inclined by a predetermined angle so that the front of the vehicle is inward in the vehicle width direction in a plan view of the vehicle, and the control rod and the torsion beam are inclined. Of the elastic bush interposed between the control rod and the torsion beam are inclined by a predetermined angle so that the front of the vehicle is inward in the vehicle width direction when viewed in a plan view of the vehicle. The rear suspension device according to claim 1, wherein an inclination angle is set to be larger than an inclination angle of an elastic bush interposed between the lateral link and the torsion beam. 4. A substantially straight line passing through a substantial connection point between the lateral link and the torsion beam by the elastic bush and orthogonal to the axis of the elastic bush in a plan view of the vehicle, and a control rod and a torsion beam by the elastic bush. 4. The rear suspension according to claim 3, wherein an intersection with a straight line passing through a connection point and orthogonal to an axis of the elastic bush in a plan view of the vehicle is arranged on a vehicle center line corresponding to a center in a vehicle width direction. apparatus. 5. A trailing link, which is swingably connected to a vehicle body member on both sides in the vehicle width direction, is connected by a torsion beam disposed substantially in the vehicle width direction. One end of a lateral link arranged in the direction is swingably connected via an elastic bush, and the other end of the lateral link is swingably connected to a vehicle body member via an elastic bush, One end of a control rod disposed substantially in the vehicle width direction is swingably connected to the torsion beam via an elastic bush, and the other end of the control rod is connected to the lateral link via an elastic bush. In the rear suspension device which is swingably connected to the shaft, both the axis of the control rod and the axis of the lateral link are shifted from the axis of the torsion beam. A rear suspension device that is arranged on both rear sides. 6. An axial line of an elastic bush interposed between the lateral link and the torsion beam is inclined by a predetermined angle so that the front of the vehicle is inward in the vehicle width direction in a plan view of the vehicle, and the control rod and the torsion beam are inclined. 6. The rear suspension device according to claim 5, wherein the axis of the elastic bush interposed between the front suspension and the rear suspension is inclined by a predetermined angle so that the front of the vehicle is outward in the vehicle width direction in a plan view of the vehicle. 7. An axis of an elastic bush interposed between the lateral link and the torsion beam is inclined by a predetermined angle so that the front of the vehicle is inward in the vehicle width direction in a plan view of the vehicle, and the control rod and the torsion beam are inclined. Of the elastic bush interposed between the control rod and the torsion beam are inclined by a predetermined angle so that the front of the vehicle is inward in the vehicle width direction when viewed in a plan view of the vehicle. The rear suspension device according to claim 5, wherein an inclination angle is set to be larger than an inclination angle of an elastic bush interposed between the lateral link and the torsion beam. 8. A substantially straight line passing through a substantial connection point between the lateral link and the torsion beam by the elastic bush and orthogonal to the axis of the elastic bush in a plan view of the vehicle, and a control rod and the torsion beam by the elastic bush. 8. The rear suspension according to claim 7, wherein an intersection with a straight line passing through a connection point and orthogonal to an axis of the elastic bush in a plan view of the vehicle is arranged on a vehicle center line corresponding to a center in a vehicle width direction. apparatus. 9. When inclining the axis of the elastic bush, the inner wall of the outer cylinder of each elastic bush is inclined by a predetermined angle in each of the predetermined directions, so that the substantial axis of the elastic force of the elastic bush is changed. The rear suspension device according to any one of claims 1 to 4, and 6 to 8, wherein the rear suspension device is inclined.