JP2007127173A - Bound stopper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make even a bound stopper exert a damping function when fine amplitude of vibration is inputted from a wheel side at the time of running of a vehicle. <P>SOLUTION: The bound stopper 1 axially is arranged on a side lower than a strut mount 2 having: an inner member 3 assembled with a cylinder rod 61 of a shock absorber 6; an outer member 4 assembled with a car body while it is concentric with the inner member 3 and is arranged at an outer periphery; and a rubbery elastomer 5 joined with both members 3 and 4. An axial lower end 11 of the bound stopper 1 is seated on a cylinder body 62 of the shock absorber 6, and an inner periphery 13 slid with the cylinder rod 61 is formed so that an axial upper end 12 is opposed to a flange 32 of the inner member 3 in a certain distant state. A recess 14 can be provided on the inner periphery 13. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a bound stopper used together with a strut mount in the field of vibration isolation technology such as an automobile.

  A strut-type suspension using a shock absorber as a strut is known as a vibration-proof support mechanism for a vehicle body used in a mini passenger car or a normal passenger car. A strut mount and a bounce stopper are attached to (see Patent Document 1).

  Conventionally used strut mounts and bound stoppers are, as shown in the following Patent Document 2, an axial upper portion of a cylinder rod of a shock absorber having a cylinder body whose lower end in the axial direction is fixed to a connecting member on the wheel side An inner member having a flange portion and a cylindrical portion extending axially downward from an outer radial end portion thereof, and an outer member disposed concentrically with the inner member on the outer peripheral side and assembled to the vehicle body A strut mount comprising a cylindrical rubber elastic body joined to the inner member and the outer member, and an axially lower side of the flange portion of the inner member at a predetermined distance from the axial upper end surface of the cylinder body It is composed of a rubber bound stopper that is seated on the end surface and held on the outer peripheral surface of the upper end portion in the axial direction of the cylinder rod.

  In the above configuration, when an axial load is input from the wheel side to the shock absorber as the vehicle travels, the cylinder rod moves up and down with respect to the cylinder body, and the transmission of vibration to the vehicle body is mitigated by the friction force generated at that time In addition, the rubber-like elastic body joined to the inner member is elastically deformed, so that vibration transmission to the vehicle body is reduced. In addition, when a large load is input to the shock absorber, the cylinder body also moves up and down as the cylinder rod moves up and down, and the upper end surface of the cylinder body is axially below the bound stopper that is seated on the inner member. The vibration transmission to the vehicle body is mitigated by elastic deformation of rubber by contacting the side end surface and compressing and deforming the bound stopper. In other words, the bound stopper exhibits a function to attenuate when a predetermined load having a large amplitude enough to be elastically deformed is input, but has a function to attenuate the input of a load having a small amplitude or less. Not done. Therefore, for the generation of fine amplitude, the vibration transmission is alleviated only by the shock absorber, so the damping force until the damping force is generated by the shock absorber is insufficient and the riding comfort characteristics are worsened. There were drawbacks.

JP 2000-177351 A JP 2001-280401 A

  The present invention has been made to eliminate the above-described problems, and the object of the present invention is to exhibit a damping function also for the bound stopper when a small amplitude is input from the wheel side as the vehicle travels. There is to make it. A further object is to increase the damping force when a large amplitude is input.

  In order to achieve the above object, a bound stopper according to claim 1 of the present invention is an inner member that is assembled to a cylinder rod of a shock absorber, an outer member that is concentric with the inner member, and is assembled to a vehicle body. In a bound stopper disposed on the lower side in the axial direction that is the shock absorber side from a strut mount that includes an outer member and a rubber-like elastic body that is joined to both the members, the lower end surface in the axial direction of the shock absorber It is seated on the cylinder body, the axially upper end surface is opposed to the flange portion of the inner member at a distance, and an inner peripheral surface that slides on the cylinder rod is formed. .

  Moreover, the bound stopper which concerns on Claim 2 of this invention is a bound stopper of Claim 1, Comprising: The recessed part is formed in the internal peripheral surface which slides with the said cylinder rod, It is characterized by the above-mentioned. is there.

  A bound stopper according to a third aspect of the present invention is the bound stopper according to the first or second aspect, wherein the shaft provided on the inward member when the cylinder body moves up and down in the axial direction. A convex portion pressed against a cylindrical portion extending in the direction is formed on the outer peripheral surface.

  The present invention has the following effects.

  In other words, the bound stopper according to the first aspect of the present invention having the above-described configuration has the axially lower end surface seated on the cylinder body of the shock absorber and the inner peripheral surface that slides with the cylinder rod is formed. When a small amplitude is input from the wheel side as the vehicle travels and the cylinder rod of the shock absorber moves up and down, the inner peripheral surface of the bound stopper slides with the cylinder rod, and a damping force is generated by the friction force. be able to. Therefore, when a small amplitude is input, the damping force until the damping force is generated by the shock absorber can be secured by the bounce stopper, so that the vehicle will behave unstablely by rolling and pitching on a small continuous uneven road. The situation can be avoided.

  Furthermore, since the bound stopper according to claim 2 has a recess formed in the inner peripheral surface that slides with the cylinder rod, a lubricant filling portion can be provided in the recess, and the cylinder rod and the inner peripheral surface slide. The frictional force can be adjusted, and the damping force can be generated even for smaller micro vibrations.

  In addition, the bounce stopper according to claim 3 has a convex portion formed on the outer peripheral surface thereof that is pressed against the cylindrical portion extending in the axial direction provided on the inner member, so that a large amplitude is input. When the cylinder main body moves up and down in the axial direction along with the vertical movement of the cylinder rod, the bound stopper seated on the cylinder main body also moves up and down, and the convex portion formed on the outer peripheral surface is provided on the inner member. It is pressed against a cylindrical portion extending in the direction and compresses the bound stopper in the radial direction, thereby improving the frictional force caused by sliding between the cylinder rod and the inner peripheral surface and generating high damping. Therefore, when a large amplitude is input, the upper end surface in the axial direction of the bound stopper comes into contact with the flange portion of the inner member and a damping force is generated due to compression deformation. In addition, friction caused by sliding between the cylinder rod and the inner peripheral surface is generated. Since high damping force is generated by force, it is possible to suppress the behavior of rolling of the vehicle body and improve steering stability.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, exemplary embodiments of the invention will be described with reference to the drawings.

  FIG. 1 is a cross-sectional view of an essential part of a first embodiment of a bound stopper to which the present invention is applied. The strut mount 2 is composed of an inner member 3, an outer member 4, and a rubber-like elastic body 5.

  The inner member 3 constituting the strut mount 2 includes an inner first cylindrical portion 31 that extends in the axial direction, and an inner flange portion that extends in the outer radial direction from the lower axial end portion of the inner first cylindrical portion 31. 32 and an inner second cylindrical portion 33 that extends downward in the axial direction from the outer diameter end portion of the inner flange portion 32, and is integrally formed of a press-formed steel plate. The inner first cylindrical portion 31 has a step above the center, and the cylinder rod 61 of the shock absorber 6 is inserted from the lower side in the axial direction into the inner small-diameter cylindrical portion 31A above the step. It is assembled.

  The outer member 4 is a press-formed steel plate, and is disposed concentrically and outwardly with the inner member 3. The outer cylindrical portion 41 having a step at the center, and the upper axial end of the outer cylindrical portion 41. And an outer flange portion 42 extending in the outer diameter direction from the portion. The outer flange portion 42 is assembled to a vehicle body (not shown) with a bolt inserted into a drilled bolt hole.

  The rubber-like elastic body 5 has a cylindrical shape made of a compound made of natural rubber or synthetic rubber, and the inner peripheral side surface 51 and the axial lower end surface 52 are vulcanized and bonded to the inner member 3, and the outer peripheral side surface 53 is vulcanized and bonded to the outer member 4.

  The bound stopper 1 is made of a rubber-like elastic body and is integrally formed. The lower end surface 11 in the axial direction has a step, and the lower end surface 11A on the inner diameter side is formed on the upper end surface 62A of the cylinder body 62 of the shock absorber 6. The outer end 11B is seated on the flange 63A of the sleeve 63 attached to the cylinder body 62. Also. The axial upper end surface 12 faces the lower end surface 32A of the flange portion 32 of the inner member 3 at a predetermined distance.

  The inner peripheral surface 13 is a buckling in which an axially upper inner peripheral surface 13A that does not slide on the cylinder rod 61 and an axial lower inner peripheral surface 13B that slides on the cylinder rod 61 are provided in a substantially axial central portion. It is divided and formed by a step 13C. The axial lower inner peripheral surface 13B slides with the cylinder rod 61 to generate a frictional force, and is formed with a recess 14 including a lubricant filling portion.

  The outer peripheral surface 15 has a stepped portion 15A with which the tip end portion 33A of the second cylindrical portion 33 of the inner member 3 contacts when the cylinder body 62 moves up and down at the time of large amplitude input. A convex portion 16 is formed at a position substantially the same as the axial position on the small-diameter outer peripheral surface 15 </ b> B where the lower axial inner peripheral surface 13 </ b> B sliding with the cylinder rod 61 is provided.

  In the above configuration, when a small amplitude is input from the wheel side as the vehicle travels, the cylinder rod 61 of the shock absorber 6 moves up and down in the axial direction, and the lower side in the axial direction in which the recess 14 of the bound stopper 1 is formed. It becomes possible to generate a damping force by sliding with the inner peripheral surface 13B and the friction force thereof.

  When a large amplitude is input, the cylinder rod 61 moves up and down in the axial direction and the cylinder main body 62 on which the bound stopper 1 is seated also moves up and down, so that the convex portion formed on the outer peripheral surface 15 of the bound stopper 1 16 is pressed against the inner second cylindrical portion 33 provided in the inner member 3 and extending in the axial direction to compress the bound stopper 1 in the radial direction. Therefore, it is possible to improve the frictional force caused by sliding between the cylinder rod 61 and the axially lower inner peripheral surface 13B in which the recess 14 is formed.

  FIG. 2 shows a second embodiment of the present invention. The shape of the inner second cylindrical portion 33 of the inner member 3 is different from that of the first embodiment. That is, the distal end portion 33A of the inner second cylindrical portion 33 is refracted in the outer diameter direction, thereby reducing the burden on the stepped portion 15A of the outer peripheral surface 15 of the bound stopper 1 with which the distal end portion 33A abuts. It becomes.

  In the present embodiment, the inner peripheral surface that slides with the cylinder rod has been described in one place. However, two or more places may be provided in order to improve the frictional force. The positions of the inner peripheral surface that slides and the inner peripheral surface that does not slide may be reversed.

Sectional drawing of the principal part of the bound stopper which concerns on 1st embodiment of this invention. Sectional drawing of the principal part of the bound stopper which concerns on 2nd embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bound stopper 11, 11A, 11B, 12 End surface 13, 13A, 13B, 15, 15B Circumferential surface 14 Concave part 16 Convex part 2 Strut mount 3 Inner member 31, 33, 41 Cylindrical part 32, 42, 63A Flange part 4 Out Directional member 5 Rubber elastic body 6 Shock absorber 61 Cylinder rod 62 Cylinder body 63 Sleeve

Claims (3)

A strut comprising an inner member assembled to the cylinder rod of the shock absorber, an outer member concentric with the inner member and disposed on the outer peripheral side and assembled to the vehicle body, and a rubber-like elastic body joined to both the members. In the bound stopper disposed on the lower side in the axial direction which is the shock absorber side from the mount,
The lower end surface in the axial direction is seated on the cylinder body of the shock absorber, the upper end surface in the axial direction is opposed to the flange portion of the inner member at a distance, and an inner peripheral surface that slides with the cylinder rod is formed. Bound stopper characterized by In the bound stopper according to claim 1,
A bound stopper, wherein a concave portion is formed on an inner peripheral surface that slides with the cylinder rod. In the bound stopper according to claim 1 or 2,
A bouncing stopper, wherein a convex portion is formed on an outer peripheral surface to be pressed against a cylindrical portion extending in the axial direction provided on the inner member when the cylinder body moves up and down in the axial direction.

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