JP2006002803A - Suspension support - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a suspension support unlikely to generate noises even if the structure enables suppressing an increase in spring constant. <P>SOLUTION: The suspension support is composed of an inner cylinder 1 to admit insertion of a piston rod of a shock absorber for coupling it, an outer cylinder 2 to be attached to a vehicle body, and a rubber-like resilient piece 3 interposed between the two cylinders 1 and 2 for coupling them together, wherein the inner cylinder 1 is configured with a bottom wall 7 of an upper metal piece 4 in the shape of an upper opened cup provided with a piston rod inserting hole and a bottom wall 8 of a lower metal piece 5 in the shape of a lower opened cup provided with a piston rod inserting hole, the two walls 7 and 8 being attached fast to each other, while the rubber-like resilient piece 3 is configured with a first tapered cylindrical part 12 in the down-spreading shape provided on the lower metal piece 5, a second tapered cylindrical part 18 in the down-spreading shape provided on the outer cylinder 2, the two being formed through vulcanized molding, a third tapered cylindrical part 10 in the up-spreading shape provided on the upper metal piece 4, and a fourth tapered cylindrical part 16 in the up-spreading shape provided on the outer cylinder 2, the parts being arranged in the non-coupled condition. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention includes an inner cylinder that is inserted and connected through a piston rod of a shock absorber, an outer cylinder that is attached to the vehicle body, a rubber-like elastic body that is interposed between the inner and outer cylinders and connects the inner cylinder and the outer cylinder. The inner cylinder is fixed to the bottom wall of the lower open cup-shaped lower metal fitting provided with the piston rod insertion hole and the bottom wall of the upper open cup-shaped upper metal fitting provided with the piston rod insertion hole. The formed suspension support.

As an example of the suspension support, as disclosed in Patent Document 1, an inner cylinder that is inserted through and connected to a piston rod of a shock absorber of an automobile, an outer cylinder that is attached to the vehicle body side, and an inner and outer cylinder are interposed. The inner cylinder is formed by polymerizing and fixing the bottom wall of the upper open cup-shaped upper metal fitting and the bottom wall of the lower open cup-shaped lower metal fitting. The rubber-like elastic body is vulcanized and formed between a taper tube portion with an upward spread provided on the metal fitting and a taper tube portion with an upper spread provided on the outer tube, and a taper tube portion with a lower spread provided on the lower metal fitting. There has been a suspension support in which a taper cylinder portion which is provided on an outer cylinder and which extends downward is separated so as to be disconnected.
International Publication Number WO 02/32701

  According to the above-described conventional configuration, the downwardly expanding tapered cylindrical portion provided in the lower metal fitting and the downwardly expanding tapered cylindrical portion provided in the outer cylinder are separated so as to be in a disconnected state. When the inner cylinder was pushed up by this input, the flange-like stopper portion on the lower end side of the lower metal fitting easily collided with the stopper portion on the lower end side of the outer cylinder, and noise was likely to occur. Although it is conceivable to vulcanize and mold the rubber-like elastic body between the tapered cylindrical portions extending downward, this increases the amount of the rubber-like elastic body and increases the spring constant.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a suspension support that can suppress an increase in the spring constant and can hardly generate abnormal noise.

A feature of the present invention is that the inner cylinder that is connected by inserting the piston rod of the shock absorber, the outer cylinder that is attached to the vehicle body side, and the rubber-like elastic that is interposed between the inner and outer cylinders and connects the inner cylinder and the outer cylinder The inner cylinder is fixed to the bottom wall of the lower open cup-shaped lower bracket with the piston rod insertion hole and the bottom wall of the upper open cup-shaped upper bracket with the piston rod insertion hole. Suspension support formed as
The rubber-like elastic body was vulcanized and formed over the first taper cylinder part that spreads downward on the lower metal fitting and the second taper cylinder part that spreads downward on the outer cylinder, and provided in the upper metal fitting. The third taper cylinder part spreading upward and the fourth taper cylinder part spreading on the outer cylinder are set in a non-connected state.

  According to this configuration, when the inner cylinder is pushed up by an input from the road surface, the rubber-like elasticity between the first taper cylinder part that spreads below the lower bracket and the second taper cylinder part that spreads below the outer cylinder. Since the body is compressed and a compressive force is generated, it is possible to suppress an increase in the amount of relative displacement in the axial direction between the first tapered tube portion and the second tapered tube portion. As a result, it is possible to avoid a collision between the stopper part on the lower metal part side and the stopper part on the outer cylinder side easily.

  In addition, since the third taper cylinder part that spreads upward from the upper metal fitting and the fourth taper cylinder part that spreads upward from the outer cylinder are in an unconnected state, there is no gap between the third taper cylinder part and the fourth taper cylinder part. In comparison with a structure in which a rubber-like elastic body is vulcanized, the amount of the rubber-like elastic body is reduced and an increase in the spring constant can be suppressed. When the tire floats from the road surface while the automobile is running, the inner cylinder descends, and the third taper cylinder part of the upper bracket collides with the fourth taper cylinder part of the outer cylinder, and noise is generated. Floating from the road surface is rare, and the adoption of the above configuration of the present invention does not cause a problem that abnormal noise is likely to occur.

  In the present invention, the taper angle of the fourth taper cylinder part of the outer cylinder is set larger than the taper angle of the third taper cylinder part of the upper metal fitting, and the upper end part of the third taper cylinder part is set to the axis of the inner and outer cylinders. The following effect can be obtained when the fourth taper tube portion is overlapped in the direction and a stopper rubber portion for the third taper tube portion is vulcanized on the inner peripheral surface of the fourth taper tube portion.

  Since the upper end portion of the third taper cylinder portion of the upper metal fitting is overlapped with the fourth taper cylinder portion of the outer cylinder in the axial direction of the inner and outer cylinders, for example, the tire floats from the road surface during traveling, and the inner cylinder When is lowered, the taper surface of the third taper tube portion can collide with the taper surface of the fourth taper tube portion. In this case, since the taper angle of the fourth taper tube portion is larger than the taper angle of the third taper tube portion, the third taper tube portion can be stably received by the fourth taper tube portion, and both tapers Compared to the structure with the same taper angle of the cylindrical part, the contact area between the tapered surfaces can be reduced and the noise can be reduced (both tapered surfaces are in contact with each other via the stopper rubber part. Is strictly indirect contact).

  In the present invention, an annular straight hole surrounding the bottom wall of the upper metal fitting and the bottom wall of the lower metal fitting is formed, and the upper end surface of the rubber-like elastic body is positioned below the bottom wall of the lower metal fitting. And spring constant can be made smaller.

  According to the present invention, it is possible to provide a suspension support that can suppress the generation of abnormal noise while having a structure that can suppress an increase in spring constant.

  Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings. In FIG. 1, an inner cylinder 1 that is inserted and connected through a piston rod of a shock absorber of an automobile, an outer cylinder 2 that is attached to the vehicle body side, and an inner and outer cylinders 1 and 2 that are interposed between the inner and outer cylinders 1 and 2. A suspension support comprising a rubber-like elastic body 3 is shown.

  The inner cylinder 1 comprises a lower open cup-shaped lower metal fitting 5 and an upper open cup-shaped upper metal fitting 4. The bottom wall 8 of the lower metal fitting 5 (hereinafter referred to as “first bottom wall 8”) and the bottom wall 7 of the upper metal fitting 4 (hereinafter referred to as “second bottom wall 7”) are each provided with a piston rod insertion hole 6 at the radial center. I have. Then, in a state where the first bottom wall 8 and the second bottom wall 7 are overlapped, the reduced diameter portion 26 of the cylindrical connecting member 25 is inserted into the both piston rod insertion holes 6 from the lower metal fitting 5 side, and the reduced diameter portion 26 is inserted. The tip protruding portion 27 is caulked so that the bottom walls 8 and 7 are superposed and adhered to each other. The entire peripheral wall of the lower metal fitting 5 is configured as a first taper cylinder portion 12 that extends downward, and the entire peripheral wall of the upper metal fitting 4 is configured as a third taper cylinder portion 10 that expands upward.

  The rubber-like elastic body 3 is vulcanized and formed on the lower metal fitting 5 over the first taper cylinder portion 12 that extends downward and the second taper cylinder portion 18 that extends downward on the outer cylinder 2. The provided third taper cylinder portion 10 that is spread upward and the fourth taper cylinder portion 16 that is provided on the outer cylinder 2 are separated from each other in a disconnected state.

  A flange 31 projecting radially outward is connected to the lower end portion of the first tapered tube portion 12 of the lower metal fitting 5, and the flange 31 is moved upward by the lower end portion 18 </ b> C of the second taper tube portion 18 of the outer tube 2. It can be received from. The second taper cylinder portion 18 and the fourth taper cylinder portion 16 of the outer cylinder 2 are smoothly connected to each other, and an attachment flange 15 for the vehicle body is connected to the upper end portion of the fourth taper cylinder portion 16. The mounting flange 15 is formed in a rounded triangular shape in plan view, and a bolt insertion hole 19 is formed in the vicinity of the apex of the triangle. The upper end of a coil spring (not shown) through which the shock absorber is inserted is received and supported by the mounting flange 15. A seat spring rubber 41 for receiving the upper end portion of the coil spring is vulcanized on the lower surface of the mounting flange 15.

  10 C of upper ends of the 3rd taper cylinder part 10 are made to overlap with the 4th taper cylinder part 16 in the axial direction of the inner and outer cylinders 1 and 2, and the stopper rubber with respect to the 3rd taper cylinder part 10 on the inner peripheral surface of the 4th taper cylinder part 16 The part 20 is formed by vulcanization, and the third taper cylinder part 10 can be received from below by the fourth taper cylinder part 16 via the stopper rubber part 20. The taper angle of the fourth taper cylinder part 16 is set larger than the taper angle of the third taper cylinder part 10. Thereby, when the 3rd taper cylinder part 10 is received by the 4th taper cylinder part 16, the contact area of both taper surfaces can be made small. Since both tapered surfaces are in contact with each other through the stopper rubber portion 20, strictly speaking, both tapered surfaces are in indirect contact with each other. The taper angle of the first taper cylinder part 12 and the taper angle of the second taper cylinder part 18 are the same.

  A rubber member 40 connected to the stopper rubber portion 20 is vulcanized on the upper surface of the mounting flange 15. The rubber-like elastic body 3, the stopper rubber portion 20, the rubber member 40, and the seat spring rubber 41 are integrally vulcanized and molded by the same rubber compound in the vulcanization molding process.

  The rubber-like elastic body 3 between the lower end portion 18C of the second tapered cylinder portion 18 of the outer cylinder 2 and the flange 31 on the lower end side of the lower metal fitting 5 is swept toward the radially inner side of the lower metal fitting 5. An annular straight hole 32 is formed. Further, an upper opening 3 is formed around the second bottom wall 7 of the upper metal fitting 4 and the first bottom wall 8 of the lower metal fitting 5, and the upper end surface 3 C of the rubber-like elastic body 3 is connected to the lower metal fitting 5. It is located below the first bottom wall 8. The inner peripheral wall of the straight hole S is parallel to the axial direction. The cross-sectional shapes of the first taper cylinder part to the fourth taper cylinder part 12, 18, 10, 16 are circular rings that are concentric with each other.

Suspension support longitudinal section

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Inner cylinder, 2 ... Outer cylinder, 3 ... Rubber-like elastic body, 3C ... Upper end surface of rubber-like elastic body, 4 ... Upper metal fitting, 5 ... Lower metal fitting, 7 ... Bottom of upper metal fitting Wall: 8 ... Bottom wall of the lower bracket, 10 ... Third taper cylinder portion that is widened on the upper bracket, 12 ... First taper tube portion that is broadly spread on the lower bracket, 15 ... Mounting flange , 16... The fourth taper cylinder portion that is widened on the outer cylinder, 18. The second taper cylinder portion that is spread on the outer cylinder, 20... The stopper rubber portion, S.

Claims (3)

An inner cylinder that is connected by inserting a piston rod of a shock absorber, an outer cylinder that is attached to the vehicle body side, and a rubber-like elastic body that is interposed between the inner and outer cylinders and connects the inner cylinder and the outer cylinder, The inner cylinder is formed by fixing the bottom wall of the lower open cup-shaped lower fitting provided with the piston rod insertion hole and the bottom wall of the upper open cup-shaped upper fitting provided with the piston rod insertion hole. Suspension support,
The rubber-like elastic body was vulcanized and formed over the first taper cylinder part that spreads downward on the lower metal fitting and the second taper cylinder part that spreads downward on the outer cylinder, and provided in the upper metal fitting. A suspension support in which the third taper cylinder portion that spreads upward and the fourth taper cylinder portion that spreads on the outer cylinder are set in a non-connected state.   The taper angle of the fourth taper cylinder part of the outer cylinder is set to be larger than the taper angle of the third taper cylinder part of the upper metal fitting, and the upper end part of the third taper cylinder part is set in the axial direction of the inner and outer cylinders. The suspension support according to claim 1, wherein a stopper rubber portion for the third taper cylinder portion is vulcanized and formed on an inner peripheral surface of the fourth taper cylinder portion so as to overlap with the 4 taper tube portion.   3. An annular straight hole surrounding the bottom wall of the upper metal fitting and the bottom wall of the lower metal fitting is formed, and the upper end surface of the rubber-like elastic body is positioned below the bottom wall of the lower metal fitting. Suspension support.

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