JP2007283886A - Mounting structure for shock absorber - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mounting structure for a shock absorber, capable of reducing size and weight, and improving a vibration damping effect. <P>SOLUTION: The mounting structure for the shock absorber comprises a knuckle 14 rotatably supporting a wheel shaft 11, a lower arm 24 supporting a rear mounting portion 55 of the knuckle 14 at a tip end and supported by a rear frame 16 at a base end, and the shock absorber 34 supporting the rear mounting portion 55 of the knuckle 14 at a lower end and supported by an upper vehicle body panel 35 at an upper end. A mounting portion 24a formed at the tip end of the lower arm 24 and a mounting portion 34a formed at a lower end of the shock absorber 23 are supported coaxially in a vehicle body fore-and-aft direction and rotatably by a bolt 26 at the rear mounting portion 55 of the knuckle 14. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a shock absorber mounting structure provided in a vehicle suspension system.

  In general, a vehicle is disposed between the wheel side and the vehicle body side to reduce fluctuations in the road surface reaction force from the wheel, improve occupant comfort, and control the direction of the wheel, thereby stabilizing the steering. A suspension device (suspension device) for improving the performance is provided. Various suspension devices are provided, and one of them is a combination of a shock absorber (shock absorber) and an arm member. In such a suspension device, the upper end of the shock absorber attached to the vehicle body member is supported by the wheel shaft support member that supports the wheel shaft, while the tip of the arm member attached to the vehicle body member is supported by the wheel shaft. By supporting the support member, the shock absorber interposed between the vehicle body side and the wheel shaft support member can freely expand and contract, and the arm member can guide the wheel so that it does not face in any direction. ing.

  Such a conventional shock absorber mounting structure is disclosed in Patent Document 1, for example.

Japanese Patent Laid-Open No. 2005-170377

  However, in the conventional shock absorber mounting structure, as shown in FIG. 7, a shock absorber (buffer) 101 supported by the vehicle body member 105 is supported by a knuckle (wheel wheel) that rotatably supports a wheel shaft 107 including wheels 106. The shaft support member 102 is attached. In this case, since it is necessary to provide the lower end attaching portion 103 for attaching the shock absorber 101 to the knuckle 102, there is a possibility that the knuckle 102 is increased in size and weight. Furthermore, not only the mounting position with the lower arm (arm member) 104 that supports the lower end of the knuckle 102 becomes close, but also the structure of the knuckle 102 itself becomes complicated.

  In order to simplify the structure of the knuckle 102, it is conceivable that the lower end of the shock absorber 201 is attached to the lower end attaching portion 203 as shown in FIG. However, when the lower end mounting portion 203 that protrudes inward in the vehicle width direction from the knuckle (wheel shaft support member) 202 is provided, the shock at the lower end mounting portion 203 from the support point of the lower arm (arm member) 204 in the vehicle body member 205 is provided. The ratio of the distance L1 to the support point of the absorber 201 and the distance L2 from the support point of the lower arm 204 in the vehicle body member 205 to the support point of the lower arm 204 in the knuckle 202, the so-called lever ratio (= L1 / L2) is reduced. End up.

  Thus, when the lever ratio is reduced, when the road surface reaction force F is transmitted to the wheel shaft 207 via the wheels 206, the amount of expansion / contraction of the shock absorber 201 decreases with respect to the vertical movement of the wheel shaft 207. Therefore, the stroke of the shock absorber 201 cannot be obtained sufficiently. As a result, the damping effect of the shock absorber 201 is reduced, and the road surface reaction force F may be transmitted to the vehicle body side such as the vehicle body member 205.

  Accordingly, an object of the present invention is to provide a shock absorber mounting structure capable of reducing the size and weight and improving the vibration damping effect.

The shock absorber mounting structure according to the first invention for solving the above-mentioned problems is
A wheel shaft support member for rotatably supporting the wheel shaft;
An arm member whose front end supports the lower portion of the wheel shaft support member and whose base end is supported by the vehicle body;
A shock absorber whose lower end supports the lower portion of the wheel shaft support member and whose upper end is supported by the vehicle body,
A coaxial member is provided that supports the tip of the arm member and the lower end of the shock absorber in the lower part of the wheel shaft support member coaxially in the longitudinal direction of the vehicle body and rotatably.

The shock absorber mounting structure according to the second invention for solving the above-mentioned problems is as follows.
In the shock absorber mounting structure according to the first invention,
The lower end of the shock absorber is disposed closer to the wheel shaft than the tip of the arm member.

The mounting structure of the shock absorber according to the third invention for solving the above-mentioned problems is as follows.
In the shock absorber mounting structure according to the first or second invention,
The wheel shaft support member has a trifurcated portion at a lower portion thereof,
The distal end of the arm member is disposed in one space portion formed by the three crotch portions, and the lower end of the shock absorber is disposed in the other space portion.

A shock absorber mounting structure according to a fourth invention for solving the above-mentioned problems is as follows.
In the shock absorber mounting structure according to the third invention,
The trifurcation is
Two thin wall portions arranged along the vehicle width direction in the vehicle longitudinal direction,
The thin wall portion is disposed between the thin wall portions, and the thick wall portion is thicker than the thin wall portion.

A shock absorber mounting structure according to a fifth aspect of the present invention for solving the above problem is as follows.
In the shock absorber mounting structure according to the third or fourth invention,
The lower end of the shock absorber is disposed in a space portion on the front side of the vehicle body, which is formed in the trifurcated portion, and the tip end of the arm member is disposed in the space portion on the rear side of the vehicle body.

  According to the shock absorber mounting structure according to the first invention, the wheel shaft support member that rotatably supports the wheel shaft, the front end supports the lower portion of the wheel shaft support member, and the base end is supported by the vehicle body. An arm member having a lower end supporting a lower portion of the wheel shaft support member, an upper end being supported by the vehicle body, a tip of the arm member, and a lower end of the shock absorber. A front end of the arm member and a lower end of the shock absorber are connected to a lower portion of the wheel shaft support member. Since it can support in a location, the structure of the said wheel shaft support member is simplified, and size reduction and weight reduction can be achieved. Moreover, since the up-and-down movement range of the shock absorber can be sufficiently secured, the vibration damping effect can be improved.

  According to the shock absorber mounting structure according to the second invention, in the shock absorber mounting structure according to the first invention, the lower end of the shock absorber is disposed closer to the wheel shaft than the tip of the arm member. The road surface reaction force from the wheel can be efficiently transmitted to the shock absorber via the wheel shaft support member.

  According to a shock absorber mounting structure according to a third aspect of the present invention, in the shock absorber mounting structure according to the first or second aspect of the invention, the wheel shaft support member has a trifurcated portion at a lower portion thereof, By disposing the tip of the arm member in one space portion formed by the crotch portion and disposing the lower end of the shock absorber in the other space portion, the attachment length of the coaxial member can be increased. Since it can do, the support rigidity of the front-end | tip of the said arm member and the lower end of the said buffer can be improved.

  According to the shock absorber mounting structure according to the fourth invention, in the shock absorber mounting structure according to the third invention, the three crotch portions are arranged along the vehicle width direction in the vehicle longitudinal direction. It is possible to improve the attachment property of the coaxial member by forming two thin wall portions and a thick wall portion which is disposed between the thin wall portions and thicker than the thin wall portion. .

  According to the shock absorber mounting structure according to the fifth invention, in the shock absorber mounting structure according to the third or fourth invention, the shock absorber is formed in the space on the front side of the vehicle body, which is formed in the three crotch portion. By disposing the lower end of the device and disposing the tip of the arm member in the space on the rear side of the vehicle body, the mounting position for holding the wheel shaft support member can be lengthened, and the wheel positioning rigidity is improved. Can do.

  Hereinafter, a shock absorber mounting structure according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a front perspective view of a suspension device having a shock absorber mounting structure according to an embodiment of the present invention, and FIG. 2 is a rear perspective view of the suspension device having a shock absorber mounting structure according to an embodiment of the present invention. 3 is a plan view of a suspension device having a shock absorber mounting structure according to an embodiment of the present invention. FIG. 4 is a rear view of the suspension device having a shock absorber mounting structure according to an embodiment of the present invention. 5 is a side view of a suspension device having a shock absorber mounting structure according to an embodiment of the present invention, and FIG. 6 is a cross-sectional view taken along the line AA in FIG.

  1 to 5 is provided on the rear wheel side of a vehicle. As shown in FIGS. 1 to 5, the suspension device 1 is provided with a wheel shaft 11, and a brake disk 13 is connected to the tip of the wheel shaft 11 via a hub unit 12. The hub unit 12 is provided through the center of a knuckle (wheel shaft support member) 14 and is composed of a ball joint, a hub, a bearing, and the like (not shown). That is, the tip of the wheel shaft 11 is fitted to a ball joint, the brake disc 13 is fixed to a hub provided at the tip of the ball joint, and a bearing provided on the radially outer side of the ball joint and the hub is a knuckle 14. It is supported by.

  The knuckle 14 includes a disk-shaped knuckle body 51, and an upper mounting portion 52, a lower mounting portion 53, a front mounting portion 54 and a rear mounting portion (lower portion) 55 formed on the outer peripheral surface of the knuckle body 51. . The upper mounting portion 52 protrudes upward from the upper peripheral portion of the knuckle main body 51, and the lower mounting portion 53 protrudes downward from the lower peripheral portion of the knuckle main body 51. Further, the front mounting portion 54 protrudes while curving from the lower front peripheral portion of the knuckle body 51 toward the inner side in the vehicle width direction, and the rear mounting portion 55 faces downward from the rear peripheral lower portion of the knuckle main body 51 and its tip. Projecting from the knuckle main body 51 so as to be disposed on the inner side in the vehicle width direction.

  A cross member 15 is provided in front of the wheel shaft 11 and a rear frame 16 is provided in the rear. The upper part of the cross member 15 and the upper end of the rear frame 16 are joined by a connecting member 17. Yes. The cross member 15, the rear frame 16, and the connecting member 17 are members constituting a vehicle body (not shown).

  A control arm 18 extending in the vehicle width direction is provided between the cross member 15 and the front mounting portion 54. The base end of the control arm 18 is rotatably supported on the end of the cross member 15 via a bolt 19 extending in the front-rear direction, and the tip is attached to the lower surface of the front mounting portion 54 via the rubber bush 20. It is supported.

  An upper arm 21 extending in the vehicle width direction is provided between the connecting member 17 and the upper mounting portion 52. The base end of the upper arm 21 is divided into two forks. The front end of the upper arm 21 is rotatably supported on the upper portion of the connecting member 17 via a bolt 22a extending in the front-rear direction, and the rear end of the upper arm 21 is connected to the rubber bush 22b. Via the connecting member 17. On the other hand, the tip of the upper arm 21 is supported on the upper surface of the upper mounting portion 52 via the rubber bush 23.

  A lower arm (arm member) 24 extending in the vehicle width direction is provided between the rear frame 16 and the rear mounting portion 55. The base end of the lower arm 24 is rotatably supported by a side end portion of the rear frame 16 via a bolt 25 extending in the front-rear direction, and a bolt (coaxial member) 26 extending in the front-rear direction is provided at the distal end. Via the inner wall of the rear mounting portion 55 so as to be rotatable.

  A stabilizer 27 extending in the vehicle width direction is disposed on the rear surface of the rear frame 16, and this stabilizer 27 is supported by the lower portion of the connecting member 17. A link member 28 is connected to the end portion of the stabilizer 27, and this link member 28 is connected to the rear end portion of the upper arm 18 via a bracket 29.

  The lower mounting portion 53 is provided with a trailing arm 30 extending in the front-rear direction. The trailing end of the trailing arm 30 is supported on the lower surface of the lower mounting portion 53 via a rubber bush 31, and the distal end is supported on a vehicle body (not shown) via a rubber bush 32.

  A shock absorber (buffer) 34 is provided between the upper arm 21 and the lower arm 24 in the front-rear direction. The shock absorber 34 is disposed so as to incline in the vehicle width direction at a predetermined angle. The upper end is supported by the upper body panel 35 constituting the vehicle body, and the lower end is supported by the rear mounting portion 55 via the bolt 26. Supported by the inner wall.

  Next, the mounting structure of the lower arm 24 and the shock absorber 34 in the rear mounting portion 55 will be described in detail with reference to FIG.

  As shown in FIG. 6, the rear mounting portion 55 is provided with a plate-like thin wall portion 55a, a thick wall portion 55b, and a thin wall portion 55c in order from the front. The thin wall portions 55a and 55c are formed to have the same thickness, and the thick wall portion 55b is formed to have a wall thickness greater than that of the thin wall portions 55a and 55c. The wall portions 55a, 55b, and 55c are screwed with a bolt 26 penetrating from behind, and the bolt 26 is screwed with a nut 36 in front of the thin wall portion 55a.

  An inner cylinder 39 is arranged coaxially with the bolt 26 on the radially outer side of the bolt 26 between the thin wall portion 55a and the thick wall portion 55b. It is provided not to. Further, a cylindrical attachment portion 34 a formed at the lower end of the shock absorber 34 is provided on the radially outer side of the inner cylinder 39 via a cylindrical rubber bush 40. The rubber bush 40 and the mounting portion 34a are arranged coaxially with the bolt 26. That is, the bolt 26 and the inner cylinder 39 are integrally formed, and the mounting portion 34 a can be rotated with respect to the bolt 26 and the inner cylinder 39 via the rubber bush 40.

  On the other hand, on the radially outer side of the bolt 26 between the thick wall portion 55b and the thin wall portion 55c, an inner cylinder 37 is disposed coaxially with the bolt 26, and the inner cylinder 39 rotates with respect to the bolt 26. It is provided not to. Further, a cylindrical attachment portion 24 a formed at the tip of the lower arm 24 is provided on the radially outer side of the inner cylinder 37 via a cylindrical rubber bush 38. The rubber bush 38 and the mounting portion 24a are arranged coaxially with the bolt 26. That is, the bolt 26 and the inner cylinder 37 are integrally formed, and the mounting portion 24 a can be rotated with respect to the bolt 26 and the inner cylinder 37 via the rubber bush 38.

  Therefore, according to the shock absorber mounting structure of the present invention, in the rear mounting portion 55 formed at the lower portion of the knuckle 14, the mounting portion 24a of the lower arm 24 and the mounting portion 34a of the shock absorber 34 are connected to the outer side in the radial direction of the bolt 26. Since the mounting portions 24a and 34a can be supported at one place by supporting the same so as to be coaxial with this, the structure of the knuckle 14 is simplified, and the size and weight can be reduced.

  Further, since the mounting portions 24a and 34a are supported using the bolts 26 having the axial center in the front-rear direction, the mounting portions 24a and 34a can be arranged at the same position in the vehicle width direction, so that the lower arm in the rear frame 16 The distance from the support point 24 (bolt 25) to the support point (bolt 26) of the attachment portion 34a in the rear attachment portion 55, and the support point of the attachment portion 24a in the rear attachment portion 55 from the support point of the lower arm 24 in the rear frame 16 The distance to the bolt 26 is the same distance L (see FIG. 4), and the so-called lever ratio is 1. As a result, a sufficient stroke of the shock absorber 34 can be ensured, and the stroke amount of the shock absorber 34 can be substantially matched to the vertical movement of the wheel shaft 11 caused by the road surface reaction force. Improvements can be made. As a result, since the transmission of the road surface reaction force to the vehicle body side can be reduced, the occupant comfort can be improved.

  Further, by disposing the attachment portion 34a closer to the wheel shaft 11 than the attachment portion 24a, that is, disposing it on the knuckle 14 side, the road surface reaction force can be efficiently transmitted to the shock absorber 36 via the knuckle 14. it can. Further, by attaching the attachment portion 24a to the rear side of the vehicle body with respect to the attachment portion 34a, the attachment span in the front-rear direction of the attachment portion 24a and the front attachment portion 54 to which the knuckle 14 and the control arm 18 are attached is lengthened. Therefore, the tire positioning rigidity, that is, the effect of defining the wheel position can be improved.

  Further, the mounting portion 34a is disposed between the thin wall portion 55a and the thick wall portion 55b, while the mounting portion 24a is disposed between the thick wall portion 55b and the thin wall portion 55c, whereby one bolt 26 is disposed. Since attachment can be performed, attachment property can be improved. Moreover, since the attachment length (axial length) of the bolt 26 can be increased, the support rigidity of the attachment portions 24a and 34a can be improved.

  In addition, since the thin wall portions 55a and 55c are formed thinner than the thick wall portion 55b, the thin wall portions 55a and 55c are easily deformed when the bolt 26 is fastened, and the axial force of the bolt 26 is changed to the inner cylinder 37, It becomes easy to transmit to 39, and the clamping force of the inner cylinders 37 and 39 can be improved.

  Applicable to shock absorber mounting structure to save space.

It is a front perspective view of a suspension device provided with a shock absorber mounting structure according to an embodiment of the present invention. 1 is a rear perspective view of a suspension device having a shock absorber mounting structure according to an embodiment of the present invention. It is a top view of the suspension apparatus provided with the attachment structure of the buffer which concerns on one Example of this invention. It is a rear view of the suspension apparatus provided with the mounting structure of the shock absorber based on one Example of this invention. It is a side view of a suspension device provided with a shock absorber mounting structure according to an embodiment of the present invention. It is AA arrow sectional drawing of FIG. It is a rear view which shows the attachment structure of the conventional shock absorber. It is a rear view which shows the attachment structure of the other conventional shock absorber.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Suspension apparatus 11 Wheel shaft 12 Hub unit 13 Brake disk 14 Knuckle 15 Cross member 16 Rear frame 17 Connecting member 18 Control arm 19, 22a, 25, 26 Bolt 20, 22b, 23, 31, 32, 38, 40 Rubber bush 21 Upper arm 24 Lower arm 24a, 34a Mounting portion 27 Stabilizer 28 Link member 29 Bracket 30 Trailing arm 34 Shock absorber 35 Upper body panel 36 Nut 37, 39 Inner cylinder 51 Knuckle body 52 Upper mounting portion 53 Lower mounting portion 54 Front mounting portion 55 Rear Mounting part 55a, 55c Thin wall part 55c Thick wall part

Claims (5)

A wheel shaft support member for rotatably supporting the wheel shaft;
An arm member whose front end supports the lower portion of the wheel shaft support member and whose base end is supported by the vehicle body;
A shock absorber whose lower end supports the lower portion of the wheel shaft support member and whose upper end is supported by the vehicle body,
A shock absorber comprising: a coaxial member that supports a tip end of the arm member and a lower end of the shock absorber in a lower portion of the wheel shaft support member coaxially in the vehicle longitudinal direction and rotatably. Mounting structure. The shock absorber mounting structure according to claim 1,
The shock absorber mounting structure, wherein a lower end of the shock absorber is disposed closer to the wheel shaft than a tip of the arm member. The shock absorber mounting structure according to claim 1 or 2,
The wheel shaft support member has a trifurcated portion at a lower portion thereof,
The shock absorber mounting structure is characterized in that the tip of the arm member is disposed in one space portion formed by the three crotch portions, and the lower end of the shock absorber is disposed in the other space portion. The shock absorber mounting structure according to claim 3,
The trifurcation is
Two thin wall portions arranged along the vehicle width direction in the vehicle longitudinal direction,
The shock absorber mounting structure is characterized in that the shock absorber is disposed between the thin wall portions and a thick wall portion having a wall thickness larger than that of the thin wall portion. The shock absorber mounting structure according to claim 3 or 4,
The shock absorber is characterized in that a lower end of the shock absorber is disposed in a space portion on the front side of the vehicle body, which is formed in the three crotch portion, and a tip end of the arm member is disposed in a space portion on the rear side of the vehicle body. Mounting structure.

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