JPH11218181A - Vibration control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure strength against pinching force without increasing the rubber quantity by forming a ring-like recessed part between an inner cylinder and a protruding part connected to an intermediate part of the inner cylinder and protruded downward in a lower body rubber part. SOLUTION: A lower body rubber part 11 has a protruding part 12 extended radially outside with its inside not coming in contact with the lower end of an inner cylinder 2 but coming in contact with an intermediate part of the inner cylinder, and protruded downward from the intermediate part so as to form a ring-like recessed part between this protruding part 12 and the inner cylinder 2. The lower body rubber part 11 extended radially outside from the protruding part 12 has a seat rubber part 15 formed for a bearing seat of a coil spring 14 at the radial outer lower face of a spring seat 9. In such constitution, equal compressive force to conventional technique is ensured to vertical input without changing the rubber quantity, and strong structure against pinching force can be ensured to input in a pinching direction without changing the rubber quantity since the recessed part 13 exists in a radially separated position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-vibration device for receiving an input from a shock absorber in a vehicle suspension and an input from a coil spring disposed on the outer periphery of the shock absorber.

[0002]

2. Description of the Related Art As a conventional vibration isolator of this kind, as shown in FIG. 4, a distal end of a piston rod 1A of a shock absorber 1 is inserted into an inner cylinder 2 and fixed with a nut 3, and An upper sheet 4 is fixed to a piston rod 1A located at a lower end, and a protective material 5 for covering the shock absorber 1 is provided on the upper sheet 4.
At the end of the elastic member 6 having an upper portion, an upper body rubber portion 7 and a lower body rubber portion 8 are provided on the outer periphery of the inner cylinder 2, and a spring seat is sandwiched between the rubber portions 7 and 8 and extends radially outward. 9 are provided. The inner cylinder 2 and the upper and lower body rubber parts 7,
The details of 8 are as shown in FIG. 5, and the lower main body rubber portion 8 is also present on the lower surface on the radial outside of the spring seat 9,
The rubber portion 8A is used for receiving a coil spring. Also, the main body rubber portions 7, 8 of the spring seat 9 are provided.
A trumpet-shaped radial restricting bracket 10 radially inward sandwiched between
Is installed.

[0003]

SUMMARY OF THE INVENTION In a conventional vibration isolator,
When a vertical input and a prying direction input are applied from the tire side, and particularly when a prying direction input is applied, a rubber portion 8B between the inner cylinder 2 of the lower main body rubber portion 8 and the cylindrical radial regulating fitting 10 is provided. If a large amount of rubber is not secured, the torsion force cannot be countered, and the rubber portion 8C near the radially inner side of the spring seat 9 is easily damaged. Increasing the amount of rubber can solve such a problem, but increasing the amount of rubber increases the cost.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a vibration isolator capable of securing the strength of a specific portion of a lower main body rubber portion against a prying force without increasing the amount of rubber.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention receives an input from a shock absorber in a vehicle suspension and an input from a coil spring disposed on the outer periphery of the shock absorber. An inner cylinder to which the piston rod of the shock absorber is fixed, upper and lower main body rubber portions provided so as to surround the inner cylinder, and a spring seat extending radially outward between the rubber portions. In the vibration damping device, the lower body rubber portion has a protruding portion whose inner side does not contact the lower end of the inner cylinder but contacts the intermediate portion of the inner cylinder and extends radially outward and protrudes downward from the middle. A ring-shaped recess is formed between the protrusion and the inner cylinder.

[0006]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

In the embodiment shown in FIG. 1, an input from a shock absorber 1 (see FIG. 4) in a vehicle suspension and a coil spring 14 disposed on the outer periphery of the shock absorber 1 are provided as in the prior art.
From the piston rod 1A of the shock absorber 1
(See FIG. 4), the inner cylinder 2 to which the distal end is fixed, upper and lower main body rubber parts 7, 11 provided so as to surround the inner cylinder 2, and are sandwiched between these main body rubber parts 7, 11. And a spring seat 9 extending radially outward. The lower body rubber portion 11 has a protruding portion 12 whose inner side does not contact the lower end of the inner cylinder 2 but contacts the intermediate portion of the inner cylinder 2 and extends radially outward to protrude downward from the middle. Part 1
A ring-shaped recess 13 is formed between the inner cylinder 2 and the inner cylinder 2. Further, a lower body rubber portion 11 extending radially outward from the projecting portion 12 is provided on a radially outer lower surface of the spring seat 9 with a seat rubber portion 15 for receiving a coil spring 14.
Is formed.

In another embodiment shown in FIG. 2, a radially outer portion of the projecting portion 12 of the spring seat 9 is bent into a U-shape, and the lower rubber of the bent portion 9A applies a large load. When they act, they function as stoppers.

In another embodiment shown in FIG. 3, a convex portion 4A is formed at a position corresponding to the concave portion 13 of the upper sheet 4 so that the protruding portion 12 contacts the outer periphery of the convex portion 4A. is there. With this configuration, the protrusion 1
It is possible to restrict the amount of stroke that is deformed inward of 2, thereby improving the compression force in the vertical direction.

[0010]

As described above, according to the present invention, the lower body rubber portion extends radially outward while contacting the middle portion of the inner cylinder without contacting the inner portion to the lower end of the inner cylinder. And a ring-shaped recess formed between the protrusion and the inner cylinder, so that the same compressive force can be applied to vertical input without changing the amount of rubber. However, for the input in the prying direction, since it is located at a position distant in the radial direction, that is, since there is a concave portion, the structure has a strong prying force without changing the amount of rubber. Further, by providing the concave portion which is a space portion, an increase in distortion of a portion of the lower main body rubber portion close to the spring seat at the time of vertical input is suppressed.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a preferred embodiment of the present invention.

FIG. 2 is a sectional view showing another embodiment.

FIG. 3 is a sectional view showing still another embodiment.

FIG. 4 is a sectional view showing a conventional example.

FIG. 5 is a detailed sectional view of a conventional vibration isolator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shock absorber 1A Piston rod 2 Inner cylinder 7 Upper main part rubber part 9 Spring seat 11 Lower main part rubber part 12 Projection part 13 Recess 14 Coil spring

Claims (1)

[Claims] An inner cylinder to which a piston rod of a shock absorber is fixed upon receiving an input from a shock absorber in a vehicle suspension system and an input from a coil spring disposed on an outer periphery of the shock absorber. In the vibration isolator provided with upper and lower main body rubber portions provided so as to surround the rubber portion and a spring seat extending radially outward between the rubber portions, the lower main body rubber portion has an inner cylinder inside. It has a protruding portion that extends radially outward in contact with the middle portion of the inner cylinder without contacting to the lower end and protrudes downward from the middle, and a ring-shaped recess is formed between the protruding portion and the inner cylinder. A vibration isolator characterized by the above-mentioned.