JP2010223316A - Mounting member of shock absorber - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a mounting member of a shock absorber with a small mounting dimension to car body side. <P>SOLUTION: The mounting member of the shock absorber is provided with: a cup type bracket fixed and held on a car body side member and opened in the opposite direction of the car body side member; and a bump stopper externally fitted to a rod of the shock absorber constituting a suspension of a vehicle and restricting an operation stroke of the shock absorber by elastic deformation, with the bracket as a guide. The bump stopper comprises a body barrel part, and a tapered tip end portion provided to a car body side end and having an outer surface with an inclination, with its diameter gradually reduced toward the car body side member. The cup type bracket includes an inclined wall part having an inside face abutting on the outer surface with the inclination of the tapered tip end portion, and the tapered tip end portion includes an annular groove formed partitioning the tapered tip end portion into a car body side member side and a shock absorber side. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an attachment member for attaching a shock absorber constituting a vehicle suspension to a vehicle body side member.

  The suspension spring expands and contracts to absorb the impact input to the vehicle. At this time, since the spring tries to continue to vibrate indefinitely, the vibration is usually absorbed or damped by the shock absorber to make it comfortable to ride. As well as improving the handling stability.

  The shock absorber is a mounting member consisting of a bump stopper that elastically limits the operating stroke of the shock absorber by compressive deformation in the axial direction and expansion in the radial direction, and a cup-shaped bracket that functions as a guide for the bump stopper. Attached to the vehicle body side member. Among the components of the mounting member, the bump stopper is one that undergoes compressive deformation in the axial direction and expansion in the radial direction when a force in the compression direction is applied. When the bracket and the bump stopper come into contact with each other due to the expansion of the direction, a support reaction force is applied to the bump stopper, especially when a large force is applied to the bump stopper in the compression direction. The reaction force is increased so as to reliably avoid contact between the outer cylinder of the shock absorber and the vehicle body.

JP 2002-257184 A

  By the way, in the above-described conventionally known technology, the size of the mounting portion on the vehicle body side has to be increased in order to arrange the bracket, and it may be difficult to apply to the vehicle.

  The present invention advantageously solves the above problem, and a tapered tip end portion having a tapered outer surface whose diameter is gradually reduced toward the vehicle body side member, that is, a tapered portion is provided at the vehicle body side end portion of the bump stopper. The cup-type bracket is characterized in that an inclined peripheral wall having an inner surface that abuts against the tapered portion is provided, and the diameter of the portion is reduced.

  Since the bump stopper and the cup-type bracket are tapered on the vehicle body side, the size of the mounting portion of the shock absorber mounting member on the vehicle body side can be reduced.

It is a longitudinal cross-sectional view in one Example of a shock absorber, an insulator, and the attachment member of the shock absorber according to this invention. It is a detailed longitudinal cross-sectional view of the attachment member of the shock absorber shown in FIG. It is a longitudinal cross-sectional view which shows the state which the bump stopper of the attachment member of the shock absorber shown in FIG. 1 contracted completely.

In the following, preferred embodiments of the present invention will be described in detail with reference to the drawings.
In the drawings, the same parts are denoted by the same reference numerals.

  FIG. 1 shows a shock according to the present invention fixedly held between a shock absorber 1 which is a shock absorbing member constituting a strut suspension of a vehicle and a vehicle body side mounting member including an insulator 2 (hereinafter referred to as an insulator 2). It is the figure which showed typically the attachment member 3 of the absorber 1. FIG. The shock absorber 1 includes a cylinder 1a with a built-in oil, and a piston rod 1b that is coaxially fixed integrally to a piston (not shown) that is slidably disposed in the cylinder 1a. The piston rod 1 b passes through the attachment member 3 and the insulator 2 and is fixed with screws at the upper end surface of the insulator 2. Here, the piston rod 1b corresponds to the rod in the claims.

  The mounting member 3 is composed of a bottom wall fixed and held on the insulator 2 by welding or a fastening force by bolts, and a side wall extending continuously and integrally extending from the bottom wall. 4 and a cylinder 1a, and a substantially cylindrical bump stopper 5 made of an elastic material such as rubber or urethane foam.

  The bump stopper 5 elastically restricts the stroke of the rod 1b by elastically generating contraction deformation along the axial direction and expansion deformation along the radial direction with the bracket 4 as a guide along with the bound of the shock absorber 1. . A plurality of inner peripheral recesses 6a and outer peripheral grooves 6b are provided at intervals on the inner peripheral surface and the outer peripheral surface of the main body body 5b of the bump stopper 5 so as to be arranged alternately along the axial direction. The cross-sectional shape has a bellows shape. A dust cover 5c that covers the cylinder 1a and the like and protects it from dust is integrally formed from the lower end region.

  As shown in FIG. 2, the bump stopper 5 includes the main body barrel 5b described above, a tapered tip portion 5a that is integrally continuous with the insulator side of the main body barrel 5b, and whose diameter is gradually reduced toward the insulator. In addition, the bottom wall side region of the side wall of the bracket 4 has an inclined wall portion that can be brought into close contact with the tapered tip portion 5a when the bound stopper 5 is deformed and has a diameter reduced temporarily toward the insulator side. 4a is formed. With this configuration, the radial dimension of the mounting member 3 on the insulator side is reduced, and application to the vehicle is facilitated. In this embodiment, the surface of the tapered tip portion 5a of the bump stopper 5 corresponds to the “inclined outer surface” according to the present invention.

  As described above, if the tapered tip end portion 5a and the inclined wall portion 4a are provided on the insulator side of the bump stopper 5 and the bracket 4, that is, only the taper is provided, the bound stopper 5 is moved along with the bounce of the shock absorber 2. When deformed, the tapered tip portion 5a is displaced with respect to the bracket 4 while being in contact with the bracket 4 (relative displacement in the in-plane direction at the contact surface), and thus is caused by friction generated between the two contact surfaces. There is also concern about abnormal noise.

For this reason, an annular groove 6c that divides the tapered tip portion 5a into an insulator side 5a1 and a shock absorber side 5a2 is provided on the insulator 2 side of the tapered tip portion 5a, preferably in the axial direction thereof. Further, the axial clearance h ₁ between mutually and the outer peripheral wall of the shock absorber side 5a2 and the inclined wall portion 4a, and the axial width h ₂ above the annular groove 6c. With this configuration, when the bump stopper 5 is deformed from the state shown in FIG. 1 to the state shown in FIG. 3, the shock absorber side 5 a 2 of the tapered tip end portion 5 a starts to completely collapse the annular groove 6 c and the side wall of the bracket 4. Therefore, the outer surface of the tapered tip portion 5a is not displaced with respect to the inclined wall portion 4b of the bracket 4 while being in contact with the inner side wall, and generation of abnormal noise can be avoided.

  Furthermore, the outer surface of each of the insulator side 5a1 and the shock absorber side 5a2 of the tapered tip portion 5a has a circumferential shape in order to make the surface pressure of both contact surfaces uniform when the bump stopper 5 is in contact with the bracket 4. An extending recess 7 is provided. With this configuration, the concave portion 7 approaches a flat surface when the bump stopper 5 is inflated and deformed along the radially outward direction, so that the variation in surface pressure is small when in contact with the bracket 4, resulting in the generation of abnormal noise. Furthermore, it can avoid reliably.

And the rigidity with respect to the axial direction deformation | transformation in the main body trunk | drum 5b is made larger than the rigidity with respect to the axial direction deformation | transformation in the taper front-end | tip part 5a. In this embodiment, by changing the radial width of the outer peripheral groove 6b, the rigidity against the axial deformation is changed by changing the thickness on the radially inner side of the outer peripheral groove 6b or the annular groove 6c of the bump stopper 5. ing. That is, as shown in FIG. 2, the thickness w ₁ radially inward of the outer peripheral groove 6b of the tapered tip portion 5a is smaller than the thickness w ₂ radially inward of the outer peripheral groove 6b of the main body barrel 5b. It is configured.

Deformation along the axial direction due to the bouncing of the shock absorber 1 is likely to occur in a small tapered distal end portion 5a of the wall thickness w ₁ than larger rear barrel 5b thick w _2. Therefore, the tapered tip portion 5a can be deformed first and brought into close contact with the bracket 4, so that the rising speed of the support reaction force by the bracket 4 can be increased, and the contact between the shock absorber 1 and the insulator 2 is ensured. Can be avoided.

  Further, by providing the annular groove 6c closer to the insulator than the center in the axial direction of the tapered tip end portion 5a, it is possible to secure particularly good low rigidity even when the input load is small, and to realize a comfortable riding comfort. Further, since the time required for the shock absorber 1 to take a stroke is shorter than the time required for the tapered tip portion 5a and the bracket inclined wall portion 4a to contact each other (that is, the time during which abnormal noise can occur), the occurrence of abnormal noise is reduced. Can be avoided more reliably. Further, when the bump stopper 5 is deformed along the axial direction as the shock absorber 1 bounces, the end of the bump stopper 5 and the bracket 4 can be brought into close contact with each other at an early stage. Is done. As a result, it is possible to avoid the bump stopper 5 from being deformed outward in the radial direction so as to inhibit the deformation in the axial direction, which is the main function, and to avoid the deterioration of the efficiency in generating the axial reaction force.

  Thus, according to the shock absorber mounting member according to the present invention, the size of the insulator side can be reduced.

DESCRIPTION OF SYMBOLS 1 Shock absorber 1a Cylinder 1b Piston rod 2 Insulator 3 Collision prevention part 4 Bracket 4a Inclined wall part 5 Bump stopper 5a Tapered tip part 5a1 Tapered tip part insulator side 5a2 Tapered tip part shock absorber side 5b Body 5a Dust cover Groove 6b Peripheral groove 6c Annular groove 7 Recessed part h1 Axial clearance between the outer wall of the shock absorber side on the shock absorber side and the inclined wall part h ₂ Axial width of the annular groove w ₁ Thickness inside the annular groove at the tapered tip part the inside of the wall thickness of the outer peripheral groove of w ₂ body

Claims (3)

A cup-type bracket that is fixedly held on the body-side member and that opens in the direction opposite to the body-side member, and is placed on the rod of the shock absorber that constitutes the suspension of the vehicle, and the shock absorber operates using the cup-type bracket as a guide With a bump stopper that limits the stroke by elastic deformation,
The bump stopper is composed of a main body trunk portion, and a tapered tip portion having a sloped outer surface gradually reduced in diameter toward the vehicle body side member provided at the vehicle body side end portion,
The cup-shaped bracket is provided with an inclined wall portion having an inner surface capable of contacting the inclined outer surface of the tapered tip portion,
An annular groove is formed in the tapered tip portion to divide the tapered tip portion into a vehicle body side member side and a shock absorber side,
An axial gap greater than the axial width of the annular groove between the outer surface on the shock absorber side at the tapered tip portion and the inner surface of the cup-shaped bracket with which the outer surface abuts after deformation of the shock absorber Provided,
After the bump stopper is deformed, the rigidity with respect to the axial deformation of the tapered tip portion is made smaller than the rigidity with respect to the axial deformation of the body portion of the bump stopper, and the tapered outer surface of the tapered tip portion is inclined. A shock absorber mounting member comprising an outer surface for maintaining a uniform surface pressure over the entire inner surface of the cup bracket. A cup-type bracket that is fixedly held on the vehicle body side member and that opens in a direction opposite to the vehicle body side member and includes a hollow portion;
A rod of a shock absorber constituting a suspension of the vehicle, extending in the vehicle vertical direction and connected to the vehicle body side member via the hollow portion;
A shock absorber cylinder slidably connected to the rod on the lower side in the vehicle vertical direction with respect to the cup-shaped bracket;
A bump stopper that is an elastic body that extends from the inside of the hollow portion of the fixing portion to the vehicle body side member of the cup-shaped bracket toward the cylinder, and through which the rod passes,
The bump stopper includes a main body trunk portion, and a tapered tip portion having an inclined outer surface extending from the main body trunk portion toward the vehicle body side member and gradually decreasing in diameter toward the vehicle body side member. Consisting of
The cup-shaped bracket is provided with an inclined wall portion having an inner surface capable of contacting the inclined outer surface of the tapered tip portion,
The tapered distal end portion includes an annular groove between a connecting portion with the main body trunk portion and a connecting portion with the vehicle body side member,
A gap is provided between the range of the main body barrel side with respect to the annular groove of the tapered tip portion and the inner side surface of the cup side bracket, and the length of the gap in the extending direction of the rod is: It is equal to or larger than the length of the annular groove in the extending direction of the rod,
Rigidity of the tapered tip portion in the extending direction of the rod is smaller than the rigidity of the main body barrel,
The shock absorber mounting member, wherein the inclined outer surface of the tapered tip portion includes a concave portion that is concave with respect to the cup-type bracket.   3. The shock absorber mounting member according to claim 1, wherein the annular groove is provided closer to a vehicle body side mounting member than a central portion of the tapered tip portion in the extending direction of the rod.

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