JPH054404Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a trailing arm type rear suspension consisting of two control arms and a cross beam that connects the two control arms.

[Conventional technology]

Conventionally, a trailing arm type rear suspension has a structure as shown in FIGS. 10 and 11. A conventional trailing arm type rear suspension 11 consists of two control arms 1 arranged corresponding to the chassis frames, that is, the vehicle body (not shown) on both sides, and a cross beam 2 that connects these control arms 1. The front end of the control arm 1 is attached to the vehicle body via an axle bush 3, and the rear end is attached to a wheel 37 via a spindle 6. Further, a coil spring 4 and a shock absorber 5 are installed between the upper surface 15 of the control arm 1 and the vehicle body.

Further, for example, a rear suspension for an automobile is disclosed in Japanese Patent Application Laid-Open No. 60-80914. This will be outlined with reference to FIG. FIG. 12 shows a rear suspension 50 for an automobile in which a rear wheel 51 is rotatably supported by wheel support members attached to the left and right sides of the rear portion of the vehicle so as to be able to swing vertically. Each of the wheel support members is configured so that a change in toe occurs when the rear wheel 51 receives a lateral force acting when the rear wheel 51 turns. When turning in the left-right direction, the amount of toe change in the toe-in direction of the rear wheel 51, which is the outer wheel, when turning on the side with a strong understeering tendency is as follows:
The left and right wheel support members are configured asymmetrically so that the amount of toe change in the toe-in direction of the rear wheel 51, which is the outer wheel, is smaller than the amount of change in toe in the toe-in direction when turning on the opposite side. More specifically, when the vehicle turns to the right, a large lateral force acts on the left and right rear wheels 51 toward the turning center, particularly a large lateral force acts on the left rear wheel 51, which is the outer wheel. The left and right sub-arms 52 tilt counterclockwise in a horizontal plane about the center portion of the rubber bushing in the axial direction by elastic deformation of the rubber bushing 53 at each front end. Along with this tilting, the rear ends of the left and right sub-arms 52, that is, the attachment parts of the sub-arms 52 to the torsion beam 54, are located at the inner and rear positions in the vehicle width direction from the center of rotation, that is, in the case of the left sub-arm 52, the rear ends of the sub-arms 52 are located at the rear of the right side. Also, since the right side sub-arm 52 is at the left rear position, the rear end of the left side sub-arm 52 moves forward and inward, and the right side sub-arm 52
At the rear end of , it moves backward and outward. As a result, the torsion beam 54 rotates clockwise while moving to the right side, which is the direction of the center of rotation, and the left and right trailing arms 55 tilt clockwise as the torsion beam 54 moves, causing the left and right trailing arms 55 to tilt clockwise. The rear wheels 51 of the vehicle are each inclined in the toe-in direction toward the turning direction. When turning to the left, the left and right sides are reversed from the above case, and the torsion beam 54 moves to the left and rotates counterclockwise, causing the left and right rear wheels 51 to move in the respective turning directions. The vehicle will now lean in the toe-in direction.

[Problem that the invention attempts to solve]

By the way, the conventional trailing arm type rear suspension 11 as shown in FIGS. 10 and 11 has good straight-line stability with little camber change and toe angle change of the wheels when the left and right wheels are simultaneously stroked. In addition, when the vehicle turns, the cross beam 2 is deformed by the roll, creating an appropriate negative camber, which provides good grip.Furthermore, the cross beam 2 also functions as a stabilizer, and is extremely simple and lightweight as a suspension. It has advantages such as low cost. However, from the point of view of compliance steering, in which the toe angle changes due to elastic deformation of the suspension system, oversteer tendency is inevitable when turning, and it is difficult to avoid stability when changing lanes, or when turning at high speed. This was disadvantageous and required other measures such as front suspension.

In addition, regarding the conventional rear suspension 50 of an automobile as shown in FIG. 12, a pair of left and right sub-arms 52 are installed in a V-shape, and the rear suspension is adjusted by slightly rotating the sub-arms 52 due to lateral force. Although the sub-arm 50 is slightly steered, it is characterized by the fact that the sub-arm 52 is attached asymmetrically. This rear suspension 50
When the coil is placed on the trailing arm 55, the front side is the sub-arm 52, so
The trailing arm 55 and the sub-arm 52 are unable to receive the downward reaction force and rotate downward.

Further, although a rotational force of the sub-arm 52 is also generated by the braking force, there is no means to absorb this force, and the above configuration cannot be adopted. Even if the bushing of the sub-arm 52 is set to be very hard, this tendency will not change, and there is a risk that resonance in the rotational direction, that is, a hop phenomenon will occur. If the bushing is too hard, front and rear compliance cannot be ensured, leading to problems such as poor riding comfort, increased vibration transmission rate, and worsening road noise.

In addition, in a trailing arm type rear suspension in which a shock absorber or strut is placed in combination with a coil spring near the spindle center line of the wheel, the front bush does not need to bear the vertical reaction force of the coil spring, but the brake reaction force is not necessary for the front bush. Similarly to the above, the above configuration cannot be adopted because there is a risk of receiving the reaction force of the rotational moment of the force and the braking force in the longitudinal direction.

The purpose of this invention is to solve the above problems, and by having the rear wheels have a slight steering angle in the same phase as the front wheels when the vehicle turns, it improves stability when changing lanes, cornering, etc. A trailing arm type rear suspension that eliminates the feeling of drifting when turning, improves the turning feeling, and generates force to counter crosswinds, uneven road surfaces, etc. when driving straight at high speed, improving stability. The goal is to provide the best of both worlds.

[Means for solving problems]

In order to solve the above problems and achieve the above objectives, this invention is constructed as follows. That is, in this invention, the front ends of a pair of control arms connected by a cross beam are attached to the vehicle body via an axle bushing, and one end is attached to the side of the control arm to the vehicle body, and the other end is attached to the control arm. More specifically, the present invention relates to a trailing arm type rear suspension comprising a link which is located at the center of the axle bushing, and further characterized in that the front or rear pivot center of the link is located substantially on the lateral center line of the axle bushing. Specifically, both ends of the links are pivotally connected to the vehicle body and the control arm via link bushes or ball joints, each of the links is arranged symmetrically, and the links are arranged on the outside of the control arm. and is located behind the axle bushing, inside the control arm and behind the axle bushing, outside of the control arm and in front of the axle bushing, or outside of the control arm and in front of the axle bushing. A trailing arm type rear suspension that is located inside and in front of the axle bushing, and further characterized in that the fulcrum of the extension line of the left and right links is normally located behind the center of the axle and on the vehicle center line. Regarding.

[Effect]

The trailing arm type rear suspension according to this invention is constructed as described above and operates as follows. That is, this trailing arm type rear suspension includes a link on the side of the control arm, one end of which is pivotally connected to the vehicle body, and the other end of which is pivotally connected to the control arm, and a bush that is pivotally connected to the front or rear side of the link. Or, since the center of the ball joint is located approximately on the lateral center line of the axle bushing, when the vehicle turns, a tire slip angle is created with respect to the direction of travel of the vehicle, and a side force, that is, a lateral force is generated.
The rear suspension performs a slight rotational movement about the instantaneous center of the link, resulting in compliance steering in the direction of understeer. Also,
Since the pivot point to which the link and the vehicle body are pivotally connected is located on the lateral center line of the axle bushing, no link interference occurs even if the rear axle swings up and down.

〔Example〕

An embodiment of the trailing arm type rear suspension according to this invention will be described below with reference to the drawings.

The trailing arm type rear suspension according to this invention differs from the conventional trailing arm type rear suspension 11 shown in FIGS. 10 and 11 in that a link 7 is provided on the side of the control arm 1. They are structurally different. Therefore, the same components are given the same reference numerals, and the explanation of their structures will be omitted.

In Fig. 1, the trailing arm type rear suspension according to this invention is shown with the overall number 10.
This trailing arm type rear suspension 10 is shown in a state when the vehicle is traveling straight. Link bushes 8 and 9 are attached to both ends of the link 7. One end of the link 7 is pivotally connected to a bracket 12 fixed to a vehicle body 13 via a link bush 8. The other end of the link 7 is pivotally connected to a bracket 14 fixed to the control arm 1 via a link bush 9. The pivot point at which the link 7 and the bracket 12 fixed to the vehicle body 13 are pivotally connected, in other words, the center of the link bush 8 on the vehicle body 13 side is located on the lateral center line 16 of the axle bush 3. In addition, the center line of the left and right links 7, in other words, the extension line 1 connecting the link bushings 8 and 9
8 is 19 on the vehicle center line and 1 on the wheel center line
It is attached so as to connect the intersection O located behind 7. Furthermore, the link 7 is located outside the control arm 1 and behind the axle bushing 3. That is, the link bushing 8 which is pivotally attached to the bracket 12 fixed to the vehicle body 13 is located on the lateral center line 16 of the axle bushings 3 that connects the pair of axle bushes 3. A link bushing 9 pivotally mounted on a bracket 14 fixed to the control arm 1 is located rearward of the lateral centerline 16 of the axle bushing 3.

FIG. 2 shows the trailing arm type rear suspension 10 shown in FIG. 1 in a state when the vehicle turns. As the vehicle turns in the direction of arrow A, a tire slip angle is created with respect to the vehicle's traveling direction, and when a side force or lateral force as shown by arrow B is generated, the rear suspension moves to point O, which is the instantaneous center of link 7.
A slight rotational movement, that is, a rotational movement by an angle θ, is performed around , and compliance steer in the understeer direction occurs.

In FIG. 3, a side sectional view taken along the line - of FIG. 1 is shown. A link bushing 8 is shown attached to a bracket 36 fixed to the bracket 12 to permit rotation, twisting, etc. Also, although it is a side sectional view seen from a different angle,
The axle bushing 3 is shown attached to the front end of the control arm 1 at a distance from the link bushing 8.

In FIG. 4, a sectional view taken along the line - in FIG. 1 is shown. A link bush 9 that allows rotation, prying, etc. is attached to a pair of brackets 14 fixed to the control arm 1.

In FIG. 5, a side view of FIG. 1 is shown. A coil spring 4 is arranged between a vehicle body 13 and a control arm 1. A bracket 12 is fixed to the vehicle body 13, and a bracket 36 is fixed to the bracket 12. A rotatable link bush 8 is attached to this bracket 36. Further, a bracket 14 is fixed to the control arm 1, and the bracket 14 is fixed to the control arm 1.
Attach link bushing 9 that can rotate etc. to 4.
Link bushing 8 and link bushing 9 are link 7
are connected via. The axle bush 3 is attached to the vehicle body 13 via a bracket 35.

FIG. 6 shows another embodiment of the trailing arm type rear suspension according to this invention. The link 20 is located inside the control arm 1 and behind the axle bush 3. The link bushing 21 is attached to a bracket 23 fixed to the cross beam 2. Although not shown, the link bush 22 is attached to the vehicle body via a bracket. The link bushing 21 and the link bushing 22 are connected by a link 20. The center line or extension line 24 of the links 20 on both sides
The intersection point, that is, the instantaneous center O ₁ is located on the vehicle center line 19 and behind the wheel center line 17. Further, the link bushing 22 is located on the lateral center line 16 of the axle bushing 3.

FIG. 7 is a sectional view taken along the line - in FIG. 6. The link bushing 21 is attached to a bracket 23 fixed to the cross beam 2.

FIG. 8 shows still another embodiment of the trailing arm type rear suspension according to this invention. The link 27 is located outside the control arm and in front of the axle bushing 3. The link bushing 25 is attached to a bracket 26 fixed to the control arm 1. Although not shown, the link bush 28 is attached to the vehicle body via a bracket. The link bushing 25 and the link bushing 28 are connected by a link 27. The intersection of the center lines or extension lines 29 of the links 27 on both sides, or the instantaneous center _O2 , is the vehicle center line 1.
9 and behind the wheel center line 17. Also, the link bushing 25 is the axle bushing 3.
It is located on the lateral centerline 16 of .

FIG. 9 shows another embodiment of the trailing arm type rear suspension according to this invention. The link 30 is located inside the control arm 1 and in front of the axle bush 3. The link bush 31 is attached to a bracket 32 fixed to the control arm 1. Although not shown, the link bush 33 is attached to the vehicle body via a bracket. Link bush 31
and link bushing 33 are connected by link 30. The intersection of the center lines or extension lines 34 of the links 30 on both sides, or the instantaneous center O ₃ , is located on the vehicle center line 19 and behind the wheel center line 17 . Further, the link bushing 31 is located on the lateral center line 16 of the axle bushing 3.

As mentioned above, the trailing arm type rear suspension according to this invention is constructed,
Of course, the present invention is not necessarily limited to the above embodiments. For example, link bushings are used to achieve attachment at pivot points between the link and a bracket fixed to the vehicle body, and at pivot points between the link and a bracket fixed to the control arm. Of course, it is also possible to use Also, regarding the link bushing to which the link is attached, the link bushing is attached via a bracket fixed to the control arm, but it does not necessarily have to be attached in such a configuration.For example, it is not necessary to attach it in such a configuration. It may be constructed so that a link bushing is attached. In that case, a bracket or the like may be fixed to the cross beam, and the link bushing may be attached to the bracket. That is, it goes without saying that this invention can be modified in various ways within the scope of the configuration described in the claims of the utility model registration.

[Effect of idea]

Since the trailing arm type rear suspension according to this invention is constructed as described above, it has the following effects. A link is provided on the side of the control arm, one end of which is pivotally connected to the vehicle body, and the other end of which is pivotally connected to the control arm, and the centerline of the link at the pivotally connected position is on the lateral centerline of the axle bushing, that is, the bushing or Since it is located on the center line connecting the ball joints, when the vehicle turns and the tire slips at an angle with respect to the direction of travel of the vehicle, and a side force or lateral force is generated, the rear suspension moves around the instantaneous center of the link. A slight rotational movement is performed around the center, resulting in compliance steer in the direction of understeer. Therefore, when turning, the rear wheels have a slight steering angle that is in the same phase as the front wheels, which improves stability when changing lanes, cornering, etc. And the feeling of tail drifting when turning is gone,
Improves turning feeling. Moreover, when driving straight at high speed, a force is generated to counter crosswinds, road surface irregularities, etc., improving stability. Further, since the pivot point at which the link and the vehicle body are pivotally connected is located on the lateral center line of the axle bushing, there is no link interference when the rear axle swings up and down.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an embodiment of the trailing arm type rear suspension according to this invention, FIG. 2 is a plan view showing the state of the trailing arm type rear suspension of FIG. 1 when it is turning, and FIG. The figure is a side sectional view taken along the line - of Fig. 1, Fig. 4 is a sectional view taken along the line - of Fig. 1, and Fig. 5 is a side sectional view taken along the line - of Fig. 1.
6 is a plan view showing another embodiment of the trailing arm type rear suspension according to this invention, FIG. 7 is a sectional view taken along the line - in FIG. 6, and FIG. A plan view showing yet another embodiment of the trailing arm type rear suspension, FIG. 9 is a plan view showing another embodiment of the trailing arm type rear suspension according to this invention, and FIG. 10 is a plan view showing a conventional trailing arm type rear suspension. A plan view showing the arm type rear suspension, Figure 11 is the first
0 is a perspective view, and FIG. 12 is a plan view showing a conventional rear suspension of an automobile. 1... Control arm, 2... Cross beam, 3... Axle bush, 4... Coil spring, 5... Shock absorber, 6... Spindle, 7, 20, 27, 30... Link, 8,
9, 21, 22, 25, 28, 31, 33... Link bushing, 10... Trailing arm type rear suspension, 12, 14, 23, 26, 32
... Bracket, 13 ... Vehicle body, 15 ... Top surface of control arm, 16 ... Center line of axle bushing, 17 ... Center line of wheel, 18, 24, 2
9, 34...Extension line of link, 19...Center line of vehicle, 37...Wheel.

Claims (1)

[Claims for Utility Model Registration] (1) The front ends of a pair of control arms connected by a cross beam are attached to the vehicle body via an axle bushing, and one end is attached to the side of the control arm and the other end is attached to the vehicle body. A trailing arm type rear suspension comprising a link attached to the arm, and further characterized in that the front or rear pivot center of the link is located substantially on the lateral center line of the axle bushing. . (2) The trailing arm type rear suspension according to claim 1, wherein both ends of the link are pivotally connected to the vehicle body and the control arm, respectively, via link bushings. (3) The trailing arm type rear suspension according to claim 1, wherein at least one end of the link is pivotally connected to the vehicle body or the control arm via a ball joint. Pension. (4) The trailing arm type rear suspension according to claim 1, wherein each of the links is arranged symmetrically. (5) The trailing arm type rear suspension according to claim 1, wherein the link is located outside the control arm and behind the axle bushing. (6) The trailing arm type rear suspension according to claim 1, wherein the link is located inside the control arm and behind the axle bushing. (7) The trailing arm type rear suspension according to claim 1, wherein the link is located outside the control arm and in front of the axle bushing. (8) The trailing arm type rear suspension according to claim 1, wherein the link is located inside the control arm and in front of the axle bushing. (9) The trailing arm type rear suspension according to claim 1 of the utility model registration claim, wherein the fulcrum of the extension line of the left and right links is normally located behind the axle center and on the vehicle center line. Shion.