JPS607207Y2 - Independent suspension system for vehicles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an independent suspension system for a vehicle, and more particularly to an independent suspension system for a vehicle that is provided with a stabilizer bar that also functions as a strut bar.

One type of stabilizer bar that suppresses the tilting of the vehicle body that occurs when the vehicle turns is a strut bar that also serves as a strut bar, which is responsible for the external force in the longitudinal direction of the vehicle that acts on the left and right swing arms that support the axle.

This stabilizer bar includes a center portion disposed along the width direction of the vehicle, and a pair of side portions extending along the length direction of the vehicle from both sides of the center portion, and the side portions are attached to the swing arm. are connected to each other via elastic members at the tips thereof, and are supported by the vehicle body via elastic members near both sides of the central portion.

An external force acting on the swing arm in the longitudinal direction of the vehicle is received by the stabilizer bar as an acting force along the longitudinal direction of both sides of the stabilizer bar via an elastic member provided at the connecting end.

However, since the stabilizer bar is conventionally attached to the vehicle body at its center, bending vibration occurs in the stabilizer bar.

This vibration causes flutter, harshness, shaking, etc. of the steering wheel, so it is required to dampen it quickly.

In order to attenuate the bending vibration of the stabilizer bar by an elastic member provided at the connecting end, it is conceivable to apply an elastic member with high damping properties to the connecting end, but in this case, the acting force causes the stabilizer bar itself to Since it acts as a spring, the damping effect is reduced.

Furthermore, without changing the conventional mounting structure of the stabilizer bar to the vehicle body, the bending vibration can be suppressed by providing a means for damping the bending vibration in the stabilizer bar itself or by increasing the bending rigidity of the stabilizer bar. It is possible to do so.

However, with either method, it is necessary to change the shape and diameter of the stabilizer bar, which leads to a change in the torsional rigidity of the stabilizer bar. From that point of view, it was inappropriate.

Special Publication No. 48-713 and Actual Publication No. 47-1632
Publication No. 6 discloses that a pair of stabilizer bars arranged along the width direction of the vehicle body, which should restrain the independent swinging of the left and right swinging arms, bear the longitudinal force of the vehicle acting on each swinging arm. A suspension system is disclosed that is coupled to a tension rod of the invention.

The tension rod is connected at one end to a corresponding swing arm, and at the other end is swingably supported by the vehicle body via an elastic bushing.

In the suspension systems described in both of the above-mentioned publications, the stabilizer bar is supported by the vehicle body via a tension rod that is inclined in the longitudinal direction of the vehicle. does not cause bending vibrations that cause vibrations such as flutter due to external forces acting in the longitudinal direction of the vehicle.

However, in both of the above-mentioned publications, both ends of the stabilizer bar are only connected to the corresponding tension rod near the other end, which is the pivot center of each tension rod, and the axis of the stabilizer bar is and the point at which the tension rod is supported on the vehicle body, that is, the center of swing, do not coincide with each other.

Therefore, it is not possible to effectively twist the stabilizer bar around its axis by the independent swinging motion of each swinging arm. Therefore, according to the suspension systems described in the above publications, when the vehicle turns It was not possible to effectively suppress the tilt of the vehicle body.

Therefore, the purpose of the present invention is to prevent vibrations such as flutter of the steering wheel, without causing bending vibrations due to external forces in the longitudinal direction of the vehicle, and to effectively suppress the tilting of the vehicle body when the vehicle is turning. An object of the present invention is to provide an independent suspension system for a vehicle equipped with a stabilizer bar.

The suspension system according to the present invention includes a stabilizer bar and an elastic support device for elastically supporting the stabilizer bar on a vehicle body, and the stabilizer bar has a center portion arranged along the width direction of the vehicle and a center portion of the center portion. Continuing on both sides of the central portion through U-shaped deformed portions that protrude forward or backward of the vehicle from the central portion on both sides, and extending in the longitudinal direction of the vehicle to the opposite side to the protruding direction of the deformed portions. a side portion having a straight portion extending substantially along the side portion and including a connecting end to a swinging arm supporting an axle; The straight line portion is elastically supported on the vehicle body with the intersection point as the center of swing.

Therefore, the external force acting on the swing arm in the longitudinal direction of the vehicle is received by the vehicle body portion via the elastic member as an acting force along the axis of the linear portion of the stabilizer bar, and the acting force is received by the vehicle body portion via the elastic member. is buffered by compressive deformation of the elastic member, and vibrations during buffering are quickly attenuated, so that bending vibrations that cause vibrations such as steering wheel flutter do not occur in the stabilizer bar.

The features of the invention will become clearer from the following description of the illustrated embodiment.

As shown in FIG. 1, an independent wheel suspension system 12 in which a stabilizer bar 10 according to the present invention is incorporated has one end pivotally connected to a bracket 14 of a vehicle body so as to be able to swing vertically. A pair of swinging arms 16 are provided, and an axle 20 of a wheel 18 is supported at the other end of each swinging arm so as to be swingable on a horizontal plane.

Each axle 20 is elastically supported by the vehicle body via a shock absorber 22 that includes a conventional coil spring (not shown).

Further, in the illustrated example, a front wheel suspension system is shown, and each axle 20 includes a knuckle arm 24 fixed to the axle, a tie rod 26 connected to the knuckle arm, and a relay rod 28 connecting the left and right tie rods. They are connected by a link mechanism so that they interlock when the vehicle turns.

In the independent wheel suspension system 12, each axle 20 swings independently of each other.

For this reason, when the vehicle turns, the vehicle body tilts to the outside of the turning circle, so to suppress this, the stabilizer bar 10 is disposed between both axles.

The stabilizer bar 10 has a U-shape as a whole, and includes a center portion 30 arranged along the width direction of the vehicle, and a U-shape projecting toward the front or rear of the vehicle on both sides of the center portion. A pair of side portions 32 are provided which are connected to both sides of the central portion through a shaped deformed portion and extend substantially along the length direction of the vehicle in a direction opposite to the protruding direction of the deformed portion.

Each side portion 32 has a straight portion 36 including an end portion 34 connected to the swing arm 16, and each end portion 34 is attached to the swing arm 16 via a pair of elastic members 38a, 38b as in the conventional case. It is being

As shown in an enlarged view in FIG. 2, the end portion 34 includes cylindrical elastic members 38a and 38b that are received in recesses provided on both sides of the swing arm 16, and holes in the elastic members. It passes through the communication hole 40 of the recess corresponding to the recess.

The end portion 34 includes a pair of washers 42a, 42b similar to the conventional ones arranged on the outer end surfaces of the elastic members 38a, 38b, and a pair of nuts 4 whose tightening margin is defined by a collar 44.
6a and 46b, and by tightening the nuts, the end 34 of the straight portion 36, that is, the end 34 of the stabilizer bar 10, is elastically connected to the swing arm 16 in the same manner as in the prior art.

The stabilizer bar 10 according to the present invention includes a swing arm 16
Each straight portion 36 including the end portion 34 connected to the straight portion 36 is attached to the vehicle body via a pair of cylindrical elastic members 48a, 48b.

Each attachment device or elastic support device includes a vehicle body portion 50, the pair of elastic members 48a, 48b, and a pair of seats 52a, 52b, as shown enlarged in FIG.

The vehicle body portion 50 is the straight portion 36 of the stabilizer bar 10.
The opening 52 receives the straight portion with play, and the opening receives the straight portion at a point 54 where the extension of the axis of the central portion 30 and the axis of the straight portion 36 intersect.

In the illustrated example, the vehicle body portion 50 is composed of brackets 50a and 50b that are joined to each other, and the intersection 54 is located on a plane perpendicular to the straight line portion 34 that includes the joint surfaces of both brackets.

The cylindrical elastic members 48a and 48b are arranged such that their respective inner end surfaces abut both sides of the vehicle body portion 50 and their holes coincide with the openings 52, and are arranged so that the inner end surfaces thereof are in contact with both surfaces of the vehicle body portion 50 and the holes thereof are aligned with the openings 52.
The reception is accepted.

Further, a pair of washers 56 a and 56 b fitted to the straight portion 36 are provided on each outer end surface of the elastic members 48 a and 48 b.
is placed.

Among the pair of seats 52a and 52b, one seat 52a is made of a flange provided on the straight portion 36, and the other seat 52b is made of a nut screwed into a male threaded portion 58 formed on the straight portion 36. Consisting of

A collar 60 is fitted into the straight portion 36 passing through the vehicle body portion 50 and the elastic members 48a, 48b to define the tightening margin of the other seat portion, that is, the nut 52b.
By tightening the nuts 52b, each straight portion 36 is elastically supported on the vehicle body portion 50 with a predetermined tightening margin.

Therefore, since the stabilizer bar 10 is attached to the vehicle body portion 50 via the elastic members 48a and 48b at each straight portion 36 including the connecting end to each swing arm 16, The external force in the longitudinal direction is received by the pair of vehicle body parts 50 via the elastic members 48a and 48b, respectively, and the external force is suitably attenuated mainly by compressive deformation of the elastic members 48a and 48b in the axial direction.

Further, the elastic members 38a and 38b provided at the end portion 34 of the straight portion 36 perform an auxiliary damping effect on the external force.

From this, each swing arm 1 of the stabilizer bar 10
Even if the external forces acting from the external forces 6 are uneven, the stabilizer bar 10 does not undergo large bending deformation due to this external force unlike in the past, and as a result, the stabilizer bar 10 does not act as a spring against the external forces and is Large bending vibrations that induce vibrations such as steering wheel fluff as in the conventional case do not occur in the bar 10.

Further, when the external forces acting on the left and right swing arms 16 are equal, the stabilizer bar 10 is attached to the vehicle body at each straight portion 36 of the pair of side portions 32, so that the stabilizer bar 10 will not bend and deform. Therefore, no bending vibration occurs in the stabilizer bar 10.

Further, when the vehicle turns, the side portion 32 of the stabilizer bar 10 rotates on a vertical plane, but the stabilizer bar 1
Since U-shaped deformed portions are provided on both sides of the center portion 30 of the vehicle 0 and protrude toward the front or rear of the vehicle than the center portion, the elastic support device provides the center of swing at the side portions 32. can be arranged so that the center of swing coincides with the intersection 54 of the axis of the linear portion 36 and the extension of the axis of the central portion 30 without interfering with the central portion.

Therefore, by connecting the straight portion 36 to the vehicle body via the elastic members 48a and 48b at the point 54 on the extension of the axis of the central portion 30, as described above, the center of swing can be aligned with the axis. I can do it.

Thereby, when a torsional force is applied to the stabilizer bar 10, the vertical movement of the central portion 30 due to this torsion can be reduced.

Furthermore, by aligning the center of swing of the side portions 32 with the intersection point 54 with the extension line of the axis of the center portion 30, the swing motion of the side portions 32 is caused to move around the axis of the center portion 30. It can be effectively applied as a torsional force.

From this, the swinging of the left and right swinging arms 16 with different phases is effectively suppressed by the torsional rigidity of the central portion, and as a result, the tilting of the vehicle body when the vehicle turns etc. is effectively suppressed. .

If the center of swing of the side portion is deviated from the intersection of the axis of the straight portion and the extension of the axis of the central portion, the side portion 3
Since a part of the swinging motion of the left and right swinging arms 16 is absorbed by the bending deformation of the central portion, etc.
The out-of-phase rocking cannot be effectively applied to the central portion 30 as a torsional force around its axis, resulting in a substantial decrease in the torsional rigidity of the central portion, which makes it difficult for the vehicle body to function as a stabilizer. The function of suppressing the slope of is significantly reduced.

In the above description, an example has been shown in which the end portion 34 of the straight portion 36 is coupled to each swing arm 16 via the elastic members 38a, 38b, but the elastic members 38a, 38b can be made unnecessary.

However, in order to effectively attenuate the external force acting on the swing arm 16 in the longitudinal direction of the vehicle, the stabilizer bar 1
0 ends 34 are preferably coupled to each swing arm 16 via elastic members 38att 38b.

Furthermore, in the example described above, the mounting structure of the stabilizer bar incorporated in the front wheel suspension system of the vehicle to the vehicle body was shown.
The present invention can also be applied to a stabilizer bar incorporated into a rear wheel suspension system.

According to the suspension system according to the present invention, it is possible to prevent bending vibration of the stabilizer bar due to an external force in the longitudinal direction of the vehicle acting on the swing arm without changing the torsional rigidity of the stabilizer bar, and to elastically absorb the external force. The support can be fixed to the vehicle body through the member, and the impact caused by this external force can be alleviated to suitably attenuate vibrations.

Therefore, the inclination of the vehicle body when the vehicle turns etc. is effectively suppressed, and the vibration of the steering wheel, etc., is prevented, thereby improving the ride comfort of the vehicle.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing the entire stabilizer bar according to the present invention, Fig. 2 is an enlarged sectional view showing the mounting structure of the stabilizer bar shown in Fig. 1 to the swing arm, and Fig. 3. 2 is a drawing similar to FIG. 2 showing the structure for attaching the stabilizer bar to the vehicle body. 10 stabilizer bar, 16: swing arm, 20: axle, 30: center, 32: side, 34: connecting end (end)
, 36: Straight line portion, 48a, 48b: Cylindrical elastic member,
50: Vehicle body part, 52a. 52b=seat.

Claims (1)

[Scope of utility model registration request] A central portion disposed along the width direction of the vehicle, and a U-shaped deformed portion that protrudes forward or rearward of the vehicle from the central portion on both sides of the central portion, and extends to both sides of the central portion, and A stabilizer bar comprising a side portion that extends substantially along the length of the vehicle in a direction opposite to the protruding direction of the deformable portion and has a straight portion including a connecting end to a swinging arm that supports an axle. , a pair of cylindrical elastic members disposed on both sides of a plate-shaped vehicle body portion having openings for receiving the straight portions and receiving the straight portions; and the straight line passing through the elastic members and the vehicle body portion. an elastic support device having a pair of seat portions provided in the cylindrical elastic member for holding the vehicle body portion between the cylindrical elastic members, the elastic support device being an extension of the axis of the straight portion and the axis of the central portion. An independent suspension system for a vehicle, characterized in that the linear portion is elastically supported on a vehicle body with a swing center centered at an intersection with a line.