JP2005119564A - Torsion beam type suspension - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To heighten the holding rigidity of an H-beam with respect to a transversely directed external force applied to vehicle wheels without sacrificing the ride comfort. <P>SOLUTION: A transverse force absorbing means 10 is mounted on the H-beam 3 constituting the frame of a suspension S' for an automobile. When an external force in the direction of Arrow A is applied to wheels W at cornering, it generates a moment in the direction of Arrow M on bushings 5 and 6. With this moment, a first beam member 14 attached to the bushing 5 through a coupling arm 16 pushes a rotary member 11 counterclockwise as shown by Arrow C. Besides, a second beam member 15 attached to the bushing 6 through the coupling arm 16 pulls the rotary member 11 clockwise in the direction of Arrow D, and the pushing force in the direction of Arrow C and the pulling force in the direction of Arrow D set off each other, which allows suppressing deflection of the H-beam 3. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a torsion beam type suspension installed in, for example, an automobile.

  As a suspension according to the prior art, a torsion beam type suspension is known (for example, see Patent Document 1). This type of torsion beam suspension will be described with reference to FIGS.

In FIG. 3, reference numeral S denotes a torsion beam suspension (hereinafter referred to as a suspension) installed in an automobile. The suspension S extends in the left-right direction between the trailing arms 100, 100 extending in the front-rear direction of the vehicle body (not shown), and between the trailing arms 100, 100, and both ends are connected to the trailing arms 100, 100. The torsion beam 101 is composed of an H-shaped beam 102 and shock absorbers 103 and 103. Further, a left compliance bush 104 and a right compliance bush 105 (hereinafter referred to as bushes 104 and 105) are integrally provided at the front ends of the trailing arms 100 and 100, respectively. These bushes 104 and 105 are fixed to a bracket (not shown) on the vehicle body side. Thus, the trailing arms 100 and 100 of the H-shaped beam 102 are supported so as to be swingable up and down around the bushes 104 and 105. Shock absorbers 103, 103 each having one end fixed to the vehicle body are attached to the rear end portions of the trailing arms 100, 100 in an extendable manner. By this shock absorber 103, the swinging of the trailing arms 100, 100 in the vertical direction is attenuated. Further, wheels (rear wheels) W and W are rotatably attached to rear end portions of the trailing arms 100 and 100 via axles (not shown).
JP 2003-128792 A (paragraph 0002)

  In such a conventional suspension S, when a lateral external force is applied to the wheel W in the direction of arrow A shown in FIG. 4 during cornering or the like, the external force is applied to the bushes 104 and 105 that support the H-shaped beam 102. The moment M due to is added in a concentrated manner. As a result, the suspension S and the wheel W move in the lateral direction as shown by a two-dot chain line in FIG. 4, and the wheel W is toe-out (TOE OUT) by force steer (a phenomenon in which the steering angle is caused by lateral external force). become. As a countermeasure, it is conceivable to set the rigidity of the bushes 104 and 105 high in order to reduce the amount of foresteering of the wheels W. However, in the conventional suspension S, if the rigidity of the bushes 104 and 105 is set high, the compliance cannot be sufficiently taken against the vibration input to the suspension S from the road surface. Therefore, the conventional suspension S has a problem that it is difficult to achieve both riding comfort and steering stability by suppressing the four-steer.

  In order to solve the above problems, an object of the present invention is to provide a torsion beam suspension in which the holding rigidity of an H beam is increased against a lateral external force applied to a wheel without sacrificing riding comfort.

  In order to achieve the above object, according to the first aspect of the present invention, a pair of left and right trailing arms that extend in the front-rear direction of the vehicle body and suspends a wheel at the rear end, and a pair of left and right trailing arms A torsion beam positioned between and extending in the left-right direction and having both ends connected to the trailing arm; a left bush and a right bush disposed at a front end portion of the pair of trailing arms and fixed to a vehicle body side fixing portion; A torsion beam suspension having a rotating member that is positioned between the pair of trailing arms and rotatably attached to the vehicle body, and the rotating member and the left bush are fixed at both ends, respectively. A first beam member fixed to the front end portion of the trailing arm, and a tray on both ends of which the rotating member and the right bush are fixed A torsion beam type suspension is proposed, which includes a second beam member fixed to the front end of the ring arm.

  According to a second aspect of the present invention, the rotating member is composed of a rotating shaft fixed to the vehicle body and a cylindrical body that is pivotally supported with respect to the rotating shaft. The first beam member is fixed to the outer peripheral surface of the cylindrical body, and the second beam member is sandwiched between the rotation center of the cylindrical body with respect to the fixed portion of the cylindrical body to which the first beam member is fixed. A torsion beam suspension is proposed, which is fixed to the outer peripheral surface of the cylindrical body at a position opposed to each other.

  According to the configuration of the first aspect, for example, when an external force in the right direction of the vehicle body is input to the wheel and the left and right bushes move to the right direction together with the H-shaped beam, the left bush is fixed to the front end of the trailing arm fixed. The first beam thus pushed pushes the rotating member counterclockwise, whereas the second beam attached to the front end of the trailing arm to which the right bushing is fixed pulls the rotating member clockwise. It becomes like this. Conversely, when an external force in the left direction of the vehicle body is input to the wheel and the left and right bushes move to the left side together with the H-shaped beam, the first beam attached to the front end of the trailing arm to which the left bush is fixed is rotated. While the moving member is pulled clockwise, the second beam attached to the front end portion of the trailing arm to which the right bush is fixed pushes the rotating member counterclockwise. It is possible to suppress the movement of the H-shaped beam in the lateral direction of the vehicle body by canceling the force pushing the pulling member of the first beam and the second beam and the pulling force. That is, according to the configuration of the first aspect, the holding rigidity of the H-beam against the lateral external force applied to the wheel can be increased without sacrificing the riding comfort.

  According to the configuration of the second aspect, for example, when an external force in the right direction of the vehicle body is input to the wheel and the left and right bushes move to the right direction together with the H-shaped beam, the left bush is fixed to the front end of the trailing arm. The attached first beam pushes the cylinder counterclockwise, while the second beam attached to the front end of the trailing arm to which the right bushing is fixed pulls the cylinder clockwise. become. On the other hand, when an external force in the left direction of the vehicle body is input to the wheel and the left and right bushes move to the left side together with the H-shaped beam, the first beam attached to the front end of the trailing arm to which the left bush is fixed is a cylinder. While the body is pulled clockwise, the second beam attached to the front end of the trailing arm to which the right bushing is fixed pushes the cylinder counterclockwise. The cylindrical body is pivotally supported by a rotation shaft, and the outer periphery of the cylindrical body is positioned at a position where the second beam member faces the fixed portion of the cylindrical body to which the first beam member is fixed with the rotation center of the cylindrical body interposed therebetween. Since it is fixed to the surface, the pushing force and the pulling force of the left and right bushing cylinders are effectively canceled out, and the H-shaped beam can be prevented from moving in the lateral direction. That is, according to the configuration of the second aspect, it is possible to further increase the holding rigidity of the H-beam with respect to the lateral external force applied to the wheel without sacrificing the riding comfort.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings as appropriate.
1 and 2 show an example of the present invention. FIG. 1 is a perspective view of a torsion beam suspension according to the present embodiment, and FIG. 2 shows the operation of the torsion beam suspension according to the present embodiment. It is a top view.
As shown in FIG. 1, reference numeral S ′ denotes a torsion beam suspension (hereinafter referred to as a suspension) installed in an automobile. And an H-shaped beam 3 consisting of a torsion beam 2 positioned between the trailing arms 1 and 1 and extending in the left-right direction at both ends and connected to the trailing arms 1 and 1, and a shock absorber 4. Composed.

  In addition, cylindrical mounting portions 1A and 1B are formed at the front end portions of the trailing arms 1 and 1, with the swinging shafts of the trailing arms 1 and 1 as axes. A left compliance bush 5 and a right compliance bush 6 (hereinafter referred to as bushes 5 and 6) are press-fitted and fitted to the mounting portions 1A and 1B, respectively. The bushes 5 and 6 are fixed to a bracket (not shown) as a vehicle body side fixing portion disposed on the vehicle body side by bolts. As a result, the trailing arms 1 and 1 of the H-shaped beam 3 are supported by the vehicle body so as to swing up and down around the bushes 5 and 6. Shock absorbers 4, 4 having one end fixed to the vehicle body are attached to the rear end portions of the trailing arms 1, 1 to be extendable. The shock absorbers 4 and 4 can attenuate the swing of the trailing arms 1 and 1 in the vertical direction. Further, wheels (rear wheels) W and W are rotatably attached to the rear ends of the trailing arms 1 and 1 via axles (not shown).

  Further, a lateral force absorbing means 10 is mounted on the H-shaped beam 3 of the suspension S ′. The lateral force absorbing means 10 includes a rotating shaft 11A, a rotating member 11 as a cylindrical body, beam mounting members 12, 13, a first beam member 14, a second beam member 15, and connecting arms 16, 16. Yes. The rotating shaft 11A is fixed so as to hang from the lower part of the floor (under the floor) of the vehicle body at the approximate center of the bracket for fixing the bush, and a columnar rotating member 11 is rotated on the rotating shaft 11A. It is pivotally supported.

  The beam attachment members 12 and 13 are rectangular parallelepiped brackets. Brackets 5A and 6A are welded to the outer peripheral surfaces of the mounting portions 1A and 1B of the bushes 5 and 6, and ball brackets 16A and 16A provided at one ends of the connecting arms 16 and 16 are attached to the brackets 5A and 6A. It is pivotally connected. Further, ball joints 16B and 16B are provided at the other ends of the connecting arms 16 and 16, respectively. These ball joints 16B and 16B are rotatably connected to the beam mounting members 12 and 13. The connecting arms 16 and 16 transmit the amount of movement of the mounting portions 1A and 1B to the beam mounting members 12 and 13 with respect to the lateral movement of the mounting portions 1A and 1B of the bushes 5 and 6. The first beam member 14 is a rod-shaped member made of a metal material such as high-tensile steel. One end of the first beam member 14 is a fixed portion 14A that is fixed to the outer peripheral surface of the rotating member 11 via a universal joint (not shown) such as a ball joint. The other end of the first beam member 14 is fixed to the beam mounting member 12 by means such as welding. The second beam member 15 is a rod-shaped member made of a metal material such as high-strength steel, and similarly to the first beam member 14, one end of the second beam member 15 is freely attached to the outer peripheral surface of the rotating member 11 such as a ball joint. The fixing portion 15A is fixed via a joint (not shown). The other end of the second beam member 15 is fixed to the beam mounting member 13 by means such as welding.

  Here, the fixing portion 15A of the second beam member 15 is opposed to the fixing portion 14A, to which one end of the first beam member 14 is fixed, across the rotating shaft 11A that is the rotation center of the rotating member 11. Is arranged. In addition, the fixing portion 14A of the first beam member 14 and the fixing portion 15A of the second beam member 15 are arranged on the front and rear sides with a straight line connecting the beam attachment members 12 and 13 interposed therebetween.

  Next, the operation of the lateral force absorbing means 10 of the suspension S ′ according to the embodiment of the present invention having the above configuration will be described with reference to FIG.

  First, when an external force in the direction indicated by the arrow A is applied to the wheels W, W during cornering, a moment in the direction indicated by the arrow M is generated in the attachment portions 1A, 1B of the bushes 5, 6 due to the external force. Then, by this moment M, the first beam member 14 attached to the attachment portion 1A of the bush 5 pushes the rotating member 11 counterclockwise in the direction of arrow C. In contrast, the second beam member 15 attached to the attachment portion 1B of the bush 6 pulls the rotating member 11 clockwise in the direction of arrow D. The pushing force in the direction indicated by the arrow C and the pulling force in the direction indicated by the arrow D cancel each other, and the movement of the H-shaped beam 3 in the direction indicated by the arrow A as described in the prior art can be suppressed (see FIG. (See the two-dot chain line in 4).

  On the other hand, when the trailing arms 1 and 1 swing in the vertical direction with the same phase, the mounting portions 1A and 1B of the bushes 5 and 6 rotate around the shafts of the bushes 5 and 6, and the bushes 5 and 6 The relative distance between the fixing points of the mounting portions 1A and 1B and the beam mounting members 12 and 13 and the rotation shaft 11A expands and contracts, but the rotation of the mounting portions 1A and 1B accompanying this expansion and contraction is in the same direction. The swing of the trailing arms 1 and 1 is not restricted by the lateral force absorbing means 10. Also, when the trailing arms 1 and 1 move in the front-rear direction with respect to the vehicle body, the fixing points between the mounting portions 1A and 1B of the bushes 5 and 6 and the beam mounting members 12 and 13 and the rotation shaft 11A However, the swinging of the trailing arms 1 and 1 is not restricted by the lateral force absorbing means 10 because the mounting portions 1A and 1B are rotated in the same direction along with the expansion and contraction.

  Therefore, according to the present embodiment, the holding force of the H-shaped beam 3 with respect to the vehicle body can be kept high by the lateral force absorbing means 10, and the tendency to toe out during cornering can be suppressed. Thereby, the bending of the bushes 5 and 6 can be set small, and both the steering stability due to the suppression of the force steer can be improved without sacrificing the riding comfort.

  Further, the fixing portion 14A of the first beam member 14 with respect to the rotating member 11 and the fixing portion 15A of the second beam member 15 with respect to the rotating member 11 are arranged at positions facing each other across the rotating shaft 11A. Since the rotating member 11 is pivotally supported by the rotating shaft 11A, the force pushing the rotating member 11 of the bushes 5 and 6 and the pulling force are effectively canceled and the H-shaped beam 3 tries to move in the lateral direction. Can be suppressed. That is, it is possible to further increase the holding rigidity of the H-shaped beam 3 against a lateral external force applied to the wheel without sacrificing the riding comfort.

It is a perspective view which shows the torsion beam type suspension which concerns on embodiment. It is a top view which shows the torsion beam type suspension in FIG. It is a perspective view which shows the torsion beam type suspension by a prior art. FIG. 4 is a plan view showing the torsion beam type suspension in FIG. 3.

Explanation of symbols

1 Trailing Arm 2 Torsion Beam 3 H Beam 5 Left Compliance Bush (Left Bush)
6 Right compliance bush (right bush)
DESCRIPTION OF SYMBOLS 10 Lateral force absorption means 11 Rotating member 14 1st beam member 14A, 15A Fixing part 15 2nd beam member S 'Torsion beam type suspension W Wheel

Claims (2)

A pair of left and right trailing arms that extend in the front-rear direction of the vehicle body and suspends a wheel on the rear end side, and are positioned between the pair of trailing arms and extend in the left-right direction, and both ends are connected to the trailing arm. In the torsion beam suspension comprising a torsion beam and a left bush and a right bush arranged at the front end portions of the pair of trailing arms and fixed to the vehicle body side fixing portion,
A rotating member positioned between the pair of trailing arms and rotatably attached to the vehicle body; and a front end portion of a trailing arm to which both ends of the rotating member and the left bush are fixed, respectively. A torsion beam comprising: a first beam member fixed to a front end; and a second beam member having both ends fixed to the front end portion of a trailing arm to which the rotating member and the right bushing are fixed, respectively. Suspension.   The rotating member includes a rotating shaft fixed to the vehicle body, and a cylindrical body pivotally supported with respect to the rotating shaft, and the first beam member is an outer peripheral surface of the cylindrical body. The second beam member is fixed to the outer peripheral surface of the cylindrical body at a position facing the fixed portion of the cylindrical body, to which the first beam member is fixed, across the rotation center of the cylindrical body. The torsion beam type suspension according to claim 1.

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