JP2006312336A - Torsion beam suspension device and bush system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make ride comfort and operation stability compatible in a torsion beam suspension device. <P>SOLUTION: A front liquid chamber 40 of a bush 26 at a right side of a vehicle and a rear liquid chamber 42 of the bush 26 at a left side of the vehicle are connected by a pipe 48 and a rear liquid chamber 42 of the bush 26 at a right side of the vehicle and a front liquid chamber 40 of the bush 26 at a left side of the vehicle are connected by a pipe 50. Thereby, even if lateral force is applied, the liquid chambers applied with compression force are connected to each other by the pipe and liquid pressures are struggled and the liquid chamber applied with force in an enlargement direction are connected to each other by the pipe and the liquid pressures are struggled. Therefore, since deformation by lateral force is suppressed and rigidity is seemingly raised, as a result, lateral steer is suppressed and the operation stability is enhanced. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a torsion beam suspension and a bushing system, and more particularly to a torsion beam suspension device and a bushing system that can achieve both riding comfort and steering stability.

  Conventionally, a torsion beam suspension device is known as a rear suspension device for an FF vehicle.

  This torsion beam suspension device includes a pair of trailing arms to which left and right rear wheels are attached, and a torsion beam that interconnects the trailing arms.

  In the trailing arm, a vibration-proof bush attached to the front end is swingably connected to a bracket of the vehicle body.

  On the other hand, at the rear end of the trailing arm, a wheel is rotatably attached to a fixed axle.

Thus, there exists a thing of patent document 1 as a torsion beam suspension apparatus, for example.
Japanese Patent Laid-Open No. 2002-266929 (FIG. 14)

  However, in the torsion beam suspension device, as shown in FIG. 10, the elastic body of the anti-vibration bush 102 at the front end of the trailing arm 100 is deformed by the lateral force SF during cornering, and the rear wheel 104 is steered (lateral force steer). Triggers an oversteer tendency.

  On the other hand, in order to improve riding comfort, it is required to reduce the longitudinal rigidity of the anti-vibration bush. However, reducing the rigidity induces an adverse effect on the steering stability (oversteer) described above. There was a problem that comfort and handling stability could not be improved at the same time.

  The present invention has been made to solve the above problems, and an object of the present invention is to provide a torsion beam suspension device and a bush system that can achieve both riding comfort and steering stability.

  In order to achieve the above object, according to the first aspect of the present invention, the front end sides of the left and right trailing arms are connected to the vehicle body via the bushes, and wheels are attached to the rear end sides of the trailing arms. A torsion beam suspension apparatus in which a trailing arm is connected by a torsion beam, wherein the bush includes an inner cylinder connected to one of the vehicle body and the trailing arm, and an outer cylinder attached to the other of the vehicle body and the trailing arm. An elastic body that connects the inner cylinder and the outer cylinder, and is disposed between the inner cylinder and the outer cylinder, and at least a part of the elastic body serves as a partition and is disposed on the front side of the vehicle body relative to the inner cylinder. The front-side liquid chamber that can be expanded and contracted, and the inner cylinder and the outer cylinder are disposed between the inner cylinder and the outer cylinder. And a rear liquid chamber that can be expanded and contracted disposed on the rear side of the vehicle body, and the front liquid chamber of the bush located on one side in the vehicle width direction and the rear side of the bush located on the other side in the vehicle width direction A liquid chamber is connected by a first pipe, and the front liquid chamber of the bush located on the other side in the vehicle body width direction and the rear liquid chamber of the bush located on the one side in the vehicle width direction are connected to the second pipe. It is characterized by being connected by.

  Next, the operation of the torsion beam suspension apparatus according to claim 1 will be described.

  In the conventional general torsion beam suspension device, when the vehicle corners, a lateral force acts on the trailing arm, and the trailing arm is displaced laterally around the bush side, that is, a so-called lateral force steer is generated. For example, when the vehicle turns left, the trailing end of the trailing arm receives a lateral force in the left direction. Due to this lateral force, the rear wheels are steered in the direction in which the vehicle cuts, and are in the oversteer direction.

  On the other hand, in the torsion beam suspension apparatus according to claim 1, for example, when the inner cylinder is connected to the vehicle body side and the outer cylinder is connected to the trailing arm side, the rear end side of the trailing arm is leftward when the vehicle turns left. In the bush on the left side of the vehicle, the outer cylinder receives forward force from the left trailing arm, and in the bush on the right side of the vehicle, the outer cylinder pulls backward in the pulling direction with the right trailing arm. receive.

  For this reason, the rear liquid chamber receives a compressive force in the bush on the left side of the vehicle, and the front liquid chamber receives a compressive force in the bush on the right side of the vehicle. Further, in the bush on the left side of the vehicle, the front liquid chamber receives a force in the expansion direction, and in the bush on the right side of the vehicle, the rear liquid chamber receives a force in the expansion direction.

  Here, the rear liquid chamber of the bush on the left side of the vehicle and the front liquid chamber of the bush on the right side of the vehicle are connected by a pipe (either the first pipe or the second pipe). The front liquid chamber and the rear liquid chamber of the bush on the right side of the vehicle are connected by a pipe (either the first pipe or the second pipe), and the liquid chambers on which the compressive force acts are connected by a pipe. Since the fluid pressure antagonizes and the fluid chambers where the force in the expansion direction acts are connected by piping and the fluid pressure antagonizes, deformation due to lateral force is suppressed, and apparent rigidity has increased. As a result, lateral force steer is suppressed and steering stability is improved.

  Similarly, when the vehicle turns to the right, the liquid chambers acting on the compression force are connected by piping, the hydraulic pressure is antagonized, and the liquid chambers acting on the expansion force are connected by piping. Since the hydraulic pressure antagonizes, the deformation due to the lateral force is suppressed, the displacement of the trailing arm due to the lateral force is suppressed, and the steering stability is improved.

  Moreover, even if the liquid chambers are connected as described above, when a longitudinal force is applied, the deformation direction is reversed between the front side and the rear side of the inner cylinder, so that no change in rigidity occurs.

  Therefore, according to this torsion beam suspension device, lateral force steer can be suppressed even in a state in which the rigidity in the front-rear direction is softened and the riding performance is improved.

  The invention according to claim 2 is the torsion beam suspension device according to claim 1, wherein the front liquid chamber and the rear liquid chamber of the bush arranged on the right side of the vehicle are arranged on the right side of the bush in the vehicle width direction. The front liquid chamber and the rear liquid chamber of the bush arranged on the left side of the vehicle are arranged on the left side of the bush in the vehicle width direction.

  Next, the operation of the torsion beam suspension apparatus according to claim 2 will be described.

  When the trailing arm is tilted when turning to the left, the shaft of the outer cylinder is tilted with respect to the axis of the inner cylinder, and in the bush arranged on the right side of the vehicle, the elastic body is compressed most on the front side and the right side of the inner cylinder. In the bush arranged on the left side of the vehicle, the elastic body is compressed most on the rear side and the left side of the inner cylinder. On the other hand, when the trailing arm is tilted when turning right, the elastic body is compressed most on the rear side and the right side of the inner cylinder in the bush arranged on the right side of the vehicle, and the elastic body is elastic on the bush arranged on the left side of the vehicle. The body is compressed most on the front side and the left side of the inner cylinder.

  Providing the liquid chamber in the portion where the elastic body is most compressed can most effectively generate the hydraulic pressure.

  Therefore, the front liquid chamber and the rear liquid chamber of the bush arranged on the right side of the vehicle are arranged on the right side of the bush in the vehicle width direction, and the front liquid chamber and the rear liquid chamber of the bush arranged on the left side of the vehicle are It is preferable to arrange on the left side in the vehicle width direction.

  According to a third aspect of the present invention, in the torsion beam suspension device according to the first aspect, the front liquid chamber and the rear liquid chamber of the bush arranged on the right side of the vehicle sandwich an axial center portion of the bush. In the vehicle width direction left side portion, the vehicle longitudinal direction dimension is set smaller than the vehicle width direction right side portion, and the front liquid chamber and the rear liquid chamber of the bush arranged on the left side of the vehicle are in the axial direction of the bush. The vehicle width direction right side part across the center part is characterized in that the dimension in the vehicle front-rear direction is set smaller than the vehicle width direction left side part.

  Next, the operation of the torsion beam suspension apparatus according to claim 3 will be described.

  For example, when the trailing arm is tilted during turning, the axis of the outer cylinder is tilted with respect to the axis of the inner cylinder. Therefore, in the front liquid chamber and the rear liquid chamber of the bush arranged on the right side of the vehicle, In the front liquid chamber and the rear liquid chamber of the bush disposed on the left side of the vehicle, the vehicle width direction left side portion with the axial center portion sandwiched therebetween is set smaller than the vehicle width direction right side portion. If the dimension in the vehicle front-rear direction is set smaller than the left part in the vehicle width direction, the narrow part of the liquid chamber is narrowed when the trailing arm is tilted more than a certain angle. The distance in the vehicle front-rear direction is eliminated, and the inclination of the outer cylinder with respect to the inner cylinder can be limited. That is, a stopper function for limiting the inclination of the trailing arm can be provided depending on the shape of the liquid chamber.

  In addition, by setting the shape of the liquid chamber in this way, it can also function as a stopper that restricts the movement of the trailing arm in the front-rear direction.

  According to a fourth aspect of the present invention, the front end sides of the left and right trailing arms are connected to the vehicle body via a bush, a wheel is attached to the rear end side of the trailing arm, and the left and right trailing arms are connected by a torsion beam. The torsion beam suspension device includes: an inner cylinder coupled to one of the vehicle body and the trailing arm; an outer cylinder attached to the other of the vehicle body and the trailing arm; the inner cylinder and the outer cylinder; An elastic body that couples the cylinder, and an expansion / contraction that is arranged between the inner cylinder and the outer cylinder and that has at least a part of the elastic body as a partition and is disposed on the vehicle body front side and the vehicle width direction outside of the inner cylinder Possible front side outer liquid chamber, disposed between the inner cylinder and the outer cylinder, at least a part of the elastic body as a partition, and the vehicle body rather than the inner cylinder And a front inner liquid chamber that is expandable / contractable disposed on the inner side in the vehicle width direction, and the rear outer liquid chamber of the bush located on the right side in the vehicle body width direction and the rear of the bush located on the left side in the vehicle width direction A side outer liquid chamber is connected by a first outer pipe, and the front inner liquid chamber of the bush located on the right side in the vehicle body width direction and the rear inner liquid chamber of the bush located on the left side in the vehicle body width direction are connected to each other. 1 is connected by an inner pipe, and the rear outer liquid chamber of the bush located on the right side in the vehicle body width direction and the front outer liquid chamber of the bush located on the left side in the vehicle body width direction are connected by a second outer pipe. The rear inner liquid chamber of the bush located on the right side in the vehicle body width direction and the front inner liquid chamber of the bush located on the left side in the vehicle body width direction are connected by a second inner pipe.

  Next, the operation of the torsion beam suspension apparatus according to claim 4 will be described.

  As described in the operation of claim 2, when the trailing arm is tilted when turning to the left, the shaft center of the outer cylinder is tilted with respect to the shaft core of the inner cylinder, and the bush arranged on the right side of the vehicle has an elastic body. Is the most compressed on the front side and the right side of the inner cylinder, and in the bush arranged on the left side of the vehicle, the elastic body is most compressed on the rear side and the left side of the inner cylinder. On the other hand, when the trailing arm is tilted when turning right, the elastic body is compressed most on the rear side and the right side of the inner cylinder in the bush arranged on the right side of the vehicle, and the elastic body is elastic on the bush arranged on the left side of the vehicle. The body is compressed most on the front side and the left side of the inner cylinder.

  In addition, the portion where the elastic body is compressed second is the opposite side in the radial direction across the inner cylinder and the opposite side in the axial direction of the inner cylinder with respect to the most compressed part.

  Therefore, the front outer liquid chamber of the bush located on the right side in the vehicle body width direction and the rear outer liquid chamber of the bush located on the left side in the vehicle body width direction are connected by the first outer pipe, and the bush located on the right side in the vehicle body width direction is connected. The front inner liquid chamber and the rear inner liquid chamber of the bush located on the left side in the vehicle body width direction are connected by the first inner pipe, and the rear outer liquid chamber of the bush located on the right side in the vehicle body width direction and the left side in the vehicle body width direction The front outer liquid chamber of the bush located is connected by a second outer pipe, and the rear inner liquid chamber of the bush located on the right side in the vehicle body width direction and the front inner liquid chamber of the bush located on the left side in the vehicle body width direction are connected to each other. When the two inner pipes are connected, the most compressed liquid chambers are connected to each other, the second compressed liquid chambers are connected to each other, and the hydraulic pressure can be effectively antagonized when a lateral force is input.

  The invention according to claim 5 is a bush system used in a torsion beam suspension device in which a left and right trailing arm and wheels are attached to a rear end side of the trailing arm and the left and right trailing arms are connected by a torsion beam. The bush system connects the inner cylinder connected to one of the vehicle body and the trailing arm, the outer cylinder attached to the other of the vehicle body and the trailing arm, and the inner cylinder and the outer cylinder. An elastic body, an expandable / contractable front liquid chamber disposed between the inner cylinder and the outer cylinder and having at least a portion of the elastic body as a partition and disposed on the front side of the vehicle body relative to the inner cylinder; It is arrange | positioned between a cylinder and the said outer cylinder, and is arrange | positioned at the vehicle body rear side rather than the said inner cylinder while using at least one part of the said elastic body as a partition. A pair of left and right bushes that connect the front end side of each trailing arm and the vehicle body, and the front liquid chamber and vehicle body of the bush located on one side in the vehicle body width direction. A first pipe connecting the rear liquid chamber of the bush located on the other side in the width direction; and the front liquid chamber of the bush located on the other side in the vehicle body width direction and the one located in the vehicle width direction one side. And a second pipe connecting the rear liquid chamber of the bush.

  Next, the operation of the bush system according to claim 5 will be described.

  The bush system according to claim 5 is used for a torsion beam suspension device. For example, when the inner cylinder is connected to the vehicle body side and the outer cylinder is connected to the trailing arm side, when the vehicle turns left, the trailing end side of the trailing arm is In the left side of the vehicle, the outer cylinder receives force from the left trailing arm, and in the right side of the vehicle, the outer cylinder is pulled backward by the right trailing arm. Receive power.

  For this reason, the rear liquid chamber receives a compressive force in the bush on the left side of the vehicle, and the front liquid chamber receives a compressive force in the bush on the right side of the vehicle. Further, in the bush on the left side of the vehicle, the front liquid chamber receives a force in the expansion direction, and in the bush on the right side of the vehicle, the rear liquid chamber receives a force in the expansion direction.

  Here, the rear liquid chamber of the bush on the left side of the vehicle and the front liquid chamber of the bush on the right side of the vehicle are connected by a pipe (either the first pipe or the second pipe). The front liquid chamber and the rear liquid chamber of the bush on the right side of the vehicle are connected by a pipe (either the first pipe or the second pipe), and the liquid chambers on which the compressive force acts are connected by a pipe. Since the fluid pressure antagonizes and the fluid chambers where the force in the expansion direction acts are connected by piping and the fluid pressure antagonizes, deformation due to lateral force is suppressed, and apparent rigidity has increased. As a result, lateral force steer is suppressed and steering stability is improved.

  Similarly, when the vehicle turns to the right, the liquid chambers acting on the compression force are connected by piping, the hydraulic pressure is antagonized, and the liquid chambers acting on the expansion force are connected by piping. Since the hydraulic pressure antagonizes, the deformation due to the lateral force is suppressed, the displacement of the trailing arm due to the lateral force is suppressed, and the steering stability is improved.

  Moreover, even if the liquid chambers are connected as described above, when a longitudinal force is applied, the deformation direction is reversed between the front side and the rear side of the inner cylinder, so that no change in rigidity occurs.

  Therefore, if this bush system is applied to a torsion beam suspension device, lateral force steer can be suppressed even in a state where the rigidity in the front-rear direction is softened and the riding performance is improved.

  According to a sixth aspect of the present invention, in the bush system according to the fifth aspect, the front liquid chamber and the rear liquid chamber of the bush disposed on the right side of the vehicle are disposed on the right side of the bush in the vehicle width direction. The front liquid chamber and the rear liquid chamber of the bush arranged on the left side of the vehicle are arranged on the left side of the bush in the vehicle width direction.

  Next, the operation of the bush system according to claim 6 will be described.

  The operation when the bush system according to claim 6 is used in the torsion beam suspension apparatus is the same as that of the torsion beam suspension apparatus according to claim 2.

  That is, by providing the liquid chamber in the portion where the elastic body is compressed most, the hydraulic pressure can be generated most effectively.

  The invention according to claim 7 is the bush system according to claim 5, wherein the front liquid chamber and the rear liquid chamber of the bush arranged on the right side of the vehicle sandwich an axial center portion of the bush. The front-side liquid chamber and the rear-liquid chamber of the bush disposed on the left side of the vehicle are set to have a vehicle front-rear direction dimension smaller than that of the vehicle width direction right-side portion. The vehicle width direction right side portion is set to have a smaller dimension in the vehicle front-rear direction than the vehicle width direction left side portion.

  Next, the operation of the bush system according to claim 7 will be described.

  The operation when the bush system according to claim 7 is used in the torsion beam suspension apparatus is the same as that of the torsion beam suspension apparatus according to claim 3.

  That is, a stopper function for limiting the inclination of the trailing arm can be provided depending on the shape of the liquid chamber. In addition, by setting the shape of the liquid chamber in this way, it can also function as a stopper that restricts the movement of the trailing arm in the front-rear direction.

  The invention according to claim 8 is a bush system used for a torsion beam suspension device in which a left and right trailing arm and wheels are attached to a rear end side of the trailing arm and the left and right trailing arms are connected by a torsion beam. The bush includes an inner cylinder coupled to one of the vehicle body and the trailing arm, an outer cylinder attached to the other of the vehicle body and the trailing arm, and an elastic coupling the inner cylinder and the outer cylinder. A front outer liquid chamber that is arranged between a body, the inner cylinder, and the outer cylinder, has at least a part of the elastic body as a partition wall, and is disposed on the vehicle body front side and the vehicle width direction outer side than the inner cylinder. And at least a part of the elastic body disposed between the inner cylinder and the outer cylinder as a partition wall and on the vehicle front side of the inner cylinder, and An expandable / contractible front inner liquid chamber disposed on both inner sides in the width direction, and the front outer liquid chamber of the bush located on the right side in the vehicle body width direction and the rear outer side of the bush located on the left side in the vehicle body width direction. A liquid chamber is connected by a first outer pipe, and the front inner liquid chamber of the bush located on the right side in the vehicle body width direction and the rear inner liquid chamber of the bush located on the left side in the vehicle width direction are connected to the first outer pipe. The rear outer liquid chamber of the bush located on the right side in the vehicle body width direction and the front outer liquid chamber of the bush located on the left side in the vehicle body width are connected by a second outer pipe. The rear inner liquid chamber of the bush located on the right side in the width direction and the front inner liquid chamber of the bush located on the left side in the vehicle body width direction are connected by a second inner pipe.

  Next, the operation of the bush system according to claim 8 will be described.

  The operation when the bush system according to the eighth aspect is used in the torsion beam suspension apparatus is the same as that of the torsion beam suspension apparatus according to the fourth aspect.

  That is, the most compressed liquid chambers are connected to each other, and the second compressed liquid chambers are connected to each other, so that the hydraulic pressure can be effectively antagonized when a lateral force is input.

  As described above, according to the torsion beam suspension of the present invention, there is an excellent effect that both riding comfort and steering stability can be achieved.

  Moreover, according to the bush system of this invention, it has the outstanding effect that riding comfort and steering stability can be made compatible.

[First Embodiment]
Hereinafter, a first embodiment of a torsion beam suspension device of the present invention will be described in detail with reference to the drawings.

  As shown in FIG. 1, in the torsion beam suspension device 10 of the present embodiment, trailing arms 12 on both the left and right sides of an automobile are connected by a torsion beam 14 and are connected to the leading end portion (rear side end portion of the vehicle) of the trailing arm 12. A rear wheel 18 is rotatably attached to the provided axle 16.

  The trailing arm 12 is connected to a spring 20 supported by a vehicle body (not shown) and an end of a damper 22.

  A cylindrical holder 24 is provided at the base end portion (front end portion of the vehicle) of the trailing arm 12.

  The above configuration is the same as that of a normal torsion beam suspension apparatus.

A bush 26 described below is inserted into the holder 24.
(Bush structure)
As shown in FIGS. 2 and 3, the bush 26 includes a cylindrical inner cylinder 28, and an outer cylinder 30 that is disposed coaxially with the inner cylinder 28 and has a larger diameter than the inner cylinder 28.

  An elastic body 32 made of rubber is disposed between the inner cylinder 28 and the outer cylinder 30, and the elastic body 32 is vulcanized and bonded to the inner cylinder 28 and the outer cylinder 30.

  The outer cylinder 30 is press-fitted and fixed to the holder 24, and a bolt (not shown in FIG. 1) provided on a bracket 36 shown in FIG. For this reason, the trailing arm 12 can swing up and down around the axis of the bolt 38.

  As shown in FIG. 2, a front liquid chamber in which an incompressible fluid such as ethylene glycol, oil, water, or the like is sealed in the elastic body 32 on the vehicle front side (arrow F direction side) with respect to the inner cylinder 28. 40 is provided, and a rear liquid chamber 42 filled with an incompressible fluid such as ethylene glycol, oil, water or the like is also provided on the vehicle rear side (arrow B direction side) with respect to the inner cylinder 28.

  In the holder 24, the outer cylinder 30, and the elastic body 32, a pipe connection hole 44 that communicates with the front liquid chamber 40 and a pipe connection hole 46 that communicates with the rear liquid chamber 42 are formed.

  As shown in FIG. 4, in the present embodiment, the pipe 48 includes a front liquid chamber 40 of the bush 26 on the right side of the vehicle (arrow R direction side) and a rear liquid chamber 42 of the bush 26 on the left side of the vehicle (arrow L direction side). The rear liquid chamber 42 of the bush 26 on the vehicle right side (arrow R direction side) and the front liquid chamber 40 of the bush 26 on the vehicle left side (arrow L direction side) are connected by a pipe 50.

The pipes 48 and 50 are connected to the pipe connection holes 44 and 46 through joints (not shown), respectively.
(Function)
Next, the operation of the torsion beam suspension device 10 of this embodiment will be described.

  When a vehicle using the torsion beam suspension device 10 of the present embodiment as a rear suspension turns left, a trailing lateral force acts on the rear wheel and the trailing arm 12 tends to tilt, so as shown in FIG. In the bush 26 on the right side of the vehicle, the front liquid chamber 40 receives a force in the compression direction and the rear liquid chamber 42 receives a force in the expansion direction. On the other hand, the bush 26 on the left side of the vehicle receives a force in the front liquid chamber 40 in the expansion direction and the rear liquid chamber 42 in the compression direction.

しかしながら、本実施形態のトーションビームサスペンション装置１０では、車両右側のブッシュ２６の前液室４０と車両左側のブッシュ２６の後液室４２とが配管４８で連結され、車両右側のブッシュ２６の後液室４２と車両左側のブッシュ２６の前液室４０とが配管５０で連結されているので、圧縮力の作用する液室同士が配管で連結されて液圧が拮抗し、拡張方向の力の作用する液室同士が配管で連結されて液圧が拮抗することになるので、横力による変形を抑制し、見かけ上剛性が上がったようになるため、結果として横ステアが抑制され、操縦安定性が向上する。

However, in the torsion beam suspension device 10 of the present embodiment, the front liquid chamber 40 of the bush 26 on the right side of the vehicle and the rear liquid chamber 42 of the bush 26 on the left side of the vehicle are connected by the pipe 48, and the rear liquid chamber of the bush 26 on the right side of the vehicle. 42 and the front liquid chamber 40 of the bush 26 on the left side of the vehicle are connected by a pipe 50, so that the liquid chambers to which the compressive force acts are connected by the pipe and the hydraulic pressure is antagonized, and the force in the expansion direction acts. Since the fluid chambers are connected by piping and the fluid pressure is antagonized, deformation due to lateral force is suppressed, and apparent rigidity is increased, resulting in reduced lateral steer and improved steering stability. improves.

  Similarly, when the vehicle turns to the right, the liquid chambers acting on the compression force are connected by piping, the hydraulic pressure antagonizes, and the liquid chambers acting on the expansion force are connected by piping. Since the hydraulic pressure is antagonized, the steering stability is similarly improved.

  When a longitudinal force is applied to the rear wheel, for example, when a backward force is applied, each liquid chamber of the bush 26 receives a force in the direction of deformation as shown in the table below.

即ち、上述したように液室同士を連結していても、前後力が作用した場合には内筒２８の前側と後側とで変形方向が逆となるため、剛性の変化は無い。

In other words, even when the liquid chambers are connected as described above, when a longitudinal force is applied, the deformation direction is reversed between the front side and the rear side of the inner cylinder 28, so that there is no change in rigidity.

  Therefore, according to the torsion beam suspension device 10 of the present embodiment, lateral force steer can be suppressed even in a state where the rigidity in the front-rear direction is softened and the riding comfort performance is improved.

In FIG. 11, the deformation of the elastic body 32 is exaggerated for easy understanding of the operation, and such a large deformation does not actually occur.
[Second Embodiment]
Next, a second embodiment of the torsion beam suspension device of the present invention will be described in detail. In addition, the same code | symbol is attached | subjected to the same structure as 1st Embodiment, and the description is abbreviate | omitted.

  As shown in FIGS. 5 and 6, in the torsion beam suspension device 10 of this embodiment, the liquid chamber shape and position of the bush 26 are different from those of the first embodiment.

  In the present embodiment, in the bush 26 on the right side of the vehicle, the front liquid chamber 40 and the rear liquid chamber 42 are formed at positions displaced outward in the vehicle width direction. The rear liquid chamber 42 is formed at a position displaced outward in the vehicle width direction.

  For example, as shown in FIG. 5, when the trailing arm 12 is tilted when turning left, the axis of the outer cylinder 30 is tilted with respect to the axis of the inner cylinder 28, and the bush 26 disposed on the right side of the vehicle The elastic body 32 is most compressed on the front side and the right side of the inner cylinder 28, and the elastic body 32 is compressed most on the rear side and the left side of the inner cylinder 28 in the bush 26 disposed on the left side of the vehicle.

  When the trailing arm 12 is tilted when turning right, the elastic body 32 is most compressed on the rear side and the right side of the inner cylinder 28 in the bush 26 disposed on the right side of the vehicle, and is disposed on the left side of the vehicle. 26, the elastic body 32 is compressed most on the front side and the left side of the inner cylinder 28.

In this embodiment, since each liquid chamber is provided in a portion where the elastic body 32 is most compressed, the liquid pressure can be generated most effectively.
[Third Embodiment]
Next, a third embodiment of the torsion beam suspension device of the present invention will be described in detail. In addition, the same code | symbol is attached | subjected to the same structure as 1st Embodiment, and the description is abbreviate | omitted.

  As shown in FIGS. 7 and 8, in the torsion beam suspension apparatus 10 of the present embodiment, the number of liquid chambers of the bush 26 is different from that of the first embodiment.

  As shown in FIG. 7, in the bush 26 of the present embodiment, a front inner liquid chamber 40A is disposed on the front side of the inner cylinder 28 and on the inner side of the vehicle, and the front outer liquid chamber 40B is disposed on the front side of the inner cylinder 28 and on the outer side of the vehicle. Is arranged. Further, a rear inner liquid chamber 42A is disposed on the rear side of the inner cylinder 28 and on the vehicle inner side, and a rear outer liquid chamber 42B is disposed on the rear side of the inner cylinder 28 and on the outer side of the vehicle.

Then, the front outer liquid chamber 40B of the bush 26 positioned on the right side in the vehicle body width direction and the rear outer liquid chamber 42B of the bush 26 positioned on the left side in the vehicle width direction are connected by the first outer pipe 48B, and the right side in the vehicle width direction The front inner liquid chamber 40A of the bush 26 located at the left and the rear inner liquid chamber 42A of the bush 26 located on the left in the vehicle width direction are connected by a first inner pipe 48A, and the bush 26 located on the right in the vehicle width direction is connected. The rear outer liquid chamber 42B and the front outer liquid chamber 40B of the bush 26 located on the left side in the vehicle body width direction are connected by a second outer pipe 50B, and the rear inner liquid chamber 42A located on the right side in the vehicle body width direction The front inner liquid chamber 40A of the bush 26 located on the left side in the vehicle body width direction is connected by a second inner pipe 50A.
(Function)
For example, when the trailing arm 12 is tilted when turning left, the axis of the outer cylinder 30 is tilted with respect to the axis of the inner cylinder 28, and in the bush 26 disposed on the right side of the vehicle, the elastic body 32 is the inner cylinder 28. In the bush 26 arranged on the left side of the vehicle, the elastic body 32 is compressed most on the rear side and the left side of the inner cylinder 28. On the other hand, when the trailing arm 12 is tilted when turning right, in the bush 26 arranged on the right side of the vehicle, the elastic body 32 is most compressed on the rear side and right side of the inner cylinder 28 and is arranged on the left side of the vehicle. 26, the elastic body 32 is compressed most on the front side and the left side of the inner cylinder 28. Further, the portion where the elastic body 32 is compressed second is the opposite side in the radial direction across the inner cylinder 28 with respect to the most compressed part, and the axially opposite side portion of the inner cylinder 28. is there.

Accordingly, the front outer liquid chamber 40B of the bush 26 located on the right side in the vehicle body width direction and the rear outer liquid chamber 42B of the bush 26 located on the left side in the vehicle body width direction are connected by the first outer pipe 48B, so The front inner liquid chamber 40A of the bush 26 located at the left and the rear inner liquid chamber 42A of the bush 26 located on the left in the vehicle width direction are connected by a first inner pipe 48A, and the bush 26 located on the right in the vehicle width direction is connected. The rear outer liquid chamber 42B and the front outer liquid chamber 40B of the bush 26 located on the left side in the vehicle body width direction are connected by the second outer pipe 50B, and the rear inner liquid chamber 42A on the bush 26 located on the right side in the vehicle body width direction. And the front inner liquid chamber 40A of the bush 26 located on the left side in the vehicle body width direction are connected by the second inner pipe 50A, the most compressed liquid chambers are connected, and the second compressed liquid chambers are connected. Sideways In input, effectively hydraulic can be antagonized.
[Fourth Embodiment]
Next, a fourth embodiment of the torsion beam suspension device of the present invention will be described in detail. In addition, the same code | symbol is attached | subjected to the same structure as 1st Embodiment, and the description is abbreviate | omitted.

  As shown in FIG. 9, the bush 26 of the torsion beam suspension apparatus 10 of the present embodiment is partially different from the first embodiment in the shapes of the front liquid chamber 40 and the rear liquid chamber 42.

  As shown in FIG. 9A, in the bush 26 of this embodiment, the front liquid chamber 40 and the rear liquid chamber 42 are both set to have a narrow dimension in the front-rear direction of the liquid chamber in the inner portion of the vehicle width direction outer side. Has been.

  For this reason, as shown in FIG. 9B, when the trailing arm 12 is inclined more than a certain angle, there is no space in the vehicle front-rear direction of the narrow part of the liquid chamber, and the outer cylinder 30 with respect to the inner cylinder 28 is removed. Tilt can be limited. That is, a stopper function for limiting the inclination of the trailing arm 12 can be provided depending on the shape of the liquid chamber.

  In addition, by setting the shape of the liquid chamber in this way, it can also function as a stopper that restricts the movement of the trailing arm 12 in the front-rear direction.

  In order to confirm the effect of the present invention, the vehicle of the embodiment using the bush to which the present invention is applied, the vehicle of the conventional example 1 using the bush without the liquid chamber, and the front and rear liquid chambers are provided. The vehicle of the prior art example 2 which used the bush which is not connected like this invention was prepared, and the degree of the effect at the time of the longitudinal force and the lateral force acting was investigated.

  ◎, ○, ×, and XX are four-level evaluations. The evaluation indicates that ◎ is the best and XX is the worst.

試験の結果、本発明の適用された実施例では、前後力、及び横力の両方に対して効果があり、乗心地と操縦安定性を両立していることが分る。

As a result of the test, it can be seen that the embodiment to which the present invention is applied is effective for both the longitudinal force and the lateral force, and has both riding comfort and steering stability.

  For example, in the case of Conventional Example 1 without a liquid chamber, if the setting is made to have a hardness opposite to the lateral force, it becomes too hard for the longitudinal force and the riding comfort deteriorates.

  In the case of the conventional example 2 with a liquid chamber and no communication, since the liquid chamber on the compression side resists the lateral force when a lateral force is generated, it becomes hard as a bush and is more effective for the lateral force than without the liquid chamber. . However, with respect to the longitudinal force, the bush as a whole becomes harder than without a liquid chamber, and the riding comfort is further deteriorated.

  On the other hand, in the embodiment, for the longitudinal force, the pressure of the front and rear liquid chambers is balanced and the ride comfort is improved because the front liquid chamber of the bush on one side and the rear liquid chamber on the opposite side are communicated. improves. On the other hand, for the lateral force, since the liquid chambers on the compression side are in communication with each other, the pressure in the liquid chamber is reduced by the volume of the pipe, but it is harder than that without the liquid chamber. Is effective.

It is a perspective view of a torsion beam suspension. It is sectional drawing of a bush. It is a perspective view of a bush. (A) And (B) is a piping diagram of the torsion beam suspension device concerning a 1st embodiment. It is a partial cross section figure of the torsion beam suspension apparatus which shows the deformation | transformation of the bush in 2nd Embodiment. (A) And (B) is a piping diagram of the torsion beam suspension apparatus concerning 2nd Embodiment. It is a partial cross section figure of the torsion beam suspension apparatus which shows the deformation | transformation of the bush in 3rd Embodiment. (A) And (B) is a piping diagram of the torsion beam suspension apparatus concerning 3rd Embodiment. (A) is sectional drawing before the deformation | transformation of the bush in 3rd Embodiment, (B) is sectional drawing after a deformation | transformation. It is a top view which shows the displacement of a torsion beam suspension apparatus. It is a partial cross section figure of the torsion beam suspension apparatus which shows a deformation | transformation of a bush.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Torsion beam suspension 12 Trailing arm 14 Torsion beam 18 Rear wheel 26 Bush 28 Inner cylinder 30 Outer cylinder 32 Elastic body 40 Front liquid chamber 42 Rear liquid chamber 48 Piping 50 Piping

Claims (8)

A torsion beam suspension device in which front end sides of left and right trailing arms are connected to a vehicle body via a bush, a wheel is attached to a rear end side of the trailing arm, and the left and right trailing arms are connected by a torsion beam,
The bush includes an inner cylinder coupled to one of the vehicle body and the trailing arm, an outer cylinder attached to the other of the vehicle body and the trailing arm, and an elastic body coupling the inner cylinder and the outer cylinder. A front-side liquid chamber that is disposed between the inner cylinder and the outer cylinder and that has at least a part of the elastic body as a partition and is disposed on the front side of the vehicle body with respect to the inner cylinder; the inner cylinder; A rear liquid chamber capable of expansion and contraction disposed between the outer cylinder and at least a part of the elastic body as a partition wall and disposed on the rear side of the vehicle body from the inner cylinder;
Connecting the front liquid chamber of the bush located on one side in the vehicle body width direction and the rear liquid chamber of the bush located on the other side in the vehicle width direction by a first pipe;
A torsion beam suspension device characterized in that the front liquid chamber of the bush located on the other side in the vehicle body width direction and the rear liquid chamber of the bush located on the one side in the vehicle width direction are connected by a second pipe. . The front liquid chamber and the rear liquid chamber of the bush arranged on the right side of the vehicle are arranged on the right side of the bush in the vehicle width direction,
The torsion beam suspension device according to claim 1, wherein the front liquid chamber and the rear liquid chamber of the bush arranged on the left side of the vehicle are arranged on the left side of the bush in the vehicle width direction. The front liquid chamber and the rear liquid chamber of the bush arranged on the right side of the vehicle have a vehicle front-back dimension that is larger in the vehicle width direction left side portion than the vehicle width direction right side portion across the axial center portion of the bush. Set small,
The front liquid chamber and the rear liquid chamber of the bush arranged on the left side of the vehicle have a vehicle width direction right side portion with a vehicle longitudinal direction dimension larger than the vehicle width direction left side portion with the axial center portion of the bush interposed therebetween. The torsion beam suspension device according to claim 1, wherein the torsion beam suspension device is set small. A torsion beam suspension device in which front end sides of left and right trailing arms are connected to a vehicle body via a bush, a wheel is attached to a rear end side of the trailing arm, and the left and right trailing arms are connected by a torsion beam,
The bush includes an inner cylinder coupled to one of the vehicle body and the trailing arm, an outer cylinder attached to the other of the vehicle body and the trailing arm, and an elastic body coupling the inner cylinder and the outer cylinder. The front outer liquid chamber capable of expanding and contracting disposed between the inner cylinder and the outer cylinder and having at least a part of the elastic body as a partition wall and disposed on the vehicle body front side and the vehicle width direction outer side than the inner cylinder, A front inner liquid chamber that is disposed between an inner cylinder and the outer cylinder and that has at least a portion of the elastic body as a partition wall and is disposed on the vehicle body front side and the vehicle width direction inner side than the inner cylinder; ,
Connecting the front outer liquid chamber of the bush located on the right side in the vehicle body width direction and the rear outer liquid chamber of the bush located on the left side in the vehicle body width direction by a first outer pipe;
The front inner liquid chamber of the bush located on the right side in the vehicle body width direction and the rear inner liquid chamber of the bush located on the left side in the vehicle body width direction are connected by a first inner pipe,
The rear outer liquid chamber of the bush located on the right side in the vehicle body width direction and the front outer liquid chamber of the bush located on the left side in the vehicle body width direction are connected by a second outer pipe,
The rear inner liquid chamber of the bush located on the right side in the vehicle body width direction and the front inner liquid chamber of the bush located on the left side in the vehicle body width direction are connected by a second inner pipe.
A torsion beam suspension device. A bushing system used in a torsion beam suspension device in which left and right trailing arms and wheels are attached to the rear end side of the trailing arm and the left and right trailing arms are connected by a torsion beam,
The bush system includes an inner cylinder coupled to one of the vehicle body and the trailing arm, an outer cylinder attached to the other of the vehicle body and the trailing arm, and an elastic body coupling the inner cylinder and the outer cylinder. An expandable / contractable front liquid chamber disposed between the inner cylinder and the outer cylinder and having at least a part of the elastic body as a partition wall and disposed in front of the vehicle body with respect to the inner cylinder; and the inner cylinder; Each of the trailing arms includes a rear liquid chamber which is disposed between the outer cylinder and at least a part of the elastic body as a partition wall and which is disposed on the rear side of the vehicle body with respect to the inner cylinder. A pair of left and right bushes connecting the front end side of the vehicle body and the vehicle body;
A first pipe that connects the front liquid chamber of the bush located on one side in the vehicle body width direction and the rear liquid chamber of the bush located on the other side in the vehicle width direction;
A second pipe connecting the front liquid chamber of the bush located on the other side in the vehicle body width direction and the rear liquid chamber of the bush located on the one side in the vehicle width direction;
Bush system characterized by having. The front liquid chamber and the rear liquid chamber of the bush arranged on the right side of the vehicle are arranged on the right side of the bush in the vehicle width direction,
The bush system according to claim 5, wherein the front liquid chamber and the rear liquid chamber of the bush arranged on the left side of the vehicle are arranged on the left side of the bush in the vehicle width direction. The front liquid chamber and the rear liquid chamber of the bush arranged on the right side of the vehicle have a vehicle front-back dimension that is larger in the vehicle width direction left side portion than the vehicle width direction right side portion across the axial center portion of the bush. Set small,
The front liquid chamber and the rear liquid chamber of the bush arranged on the left side of the vehicle have a vehicle width direction right side portion with a vehicle longitudinal direction dimension larger than the vehicle width direction left side portion with the axial center portion of the bush interposed therebetween. The bush system according to claim 5, wherein the bush system is set to be small. A bushing system used in a torsion beam suspension device in which left and right trailing arms and wheels are attached to the rear end side of the trailing arm and the left and right trailing arms are connected by a torsion beam,
The bush includes an inner cylinder coupled to one of the vehicle body and the trailing arm, an outer cylinder attached to the other of the vehicle body and the trailing arm, and an elastic body coupling the inner cylinder and the outer cylinder. The front outer liquid chamber capable of expanding and contracting disposed between the inner cylinder and the outer cylinder and having at least a part of the elastic body as a partition wall and disposed on the vehicle body front side and the vehicle width direction outer side than the inner cylinder, A front inner liquid chamber that is disposed between an inner cylinder and the outer cylinder and that has at least a portion of the elastic body as a partition wall and is disposed on the vehicle body front side and the vehicle width direction inner side than the inner cylinder; ,
Connecting the front outer liquid chamber of the bush located on the right side in the vehicle body width direction and the rear outer liquid chamber of the bush located on the left side in the vehicle body width direction by a first outer pipe;
The front inner liquid chamber of the bush located on the right side in the vehicle body width direction and the rear inner liquid chamber of the bush located on the left side in the vehicle body width direction are connected by a first inner pipe,
The rear outer liquid chamber of the bush located on the right side in the vehicle body width direction and the front outer liquid chamber of the bush located on the left side in the vehicle body width direction are connected by a second outer pipe,
The rear inner liquid chamber of the bush located on the right side in the vehicle body width direction and the front inner liquid chamber of the bush located on the left side in the vehicle body width direction are connected by a second inner pipe.
Bush system characterized by that.

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