Cylindrical vibration-isolation device

Abstract

PROBLEM TO BE SOLVED: To provide a cylindrical vibration damping device of a new structure, capable of preventing a stopper rubber from being bitten between an inner shaft member and a mounting object member, while securing a rubber volume of the stopper rubber, without requiring a shape change of the inner shaft member and an outer cylindrical member. SOLUTION: A projection height H from a stopper 24 of the stopper rubber 34 is made larger than a separation distance D between an outer peripheral edge of an end surface 20 in an axial direction of the inner shaft member 12 and an inner peripheral end of the stopper 24 of the outer cylindrical member 14. Also, an elastic main shaft L in the projecting direction of the stopper rubber 34 is inclined to an peripheral side toward the tip side of the stopper rubber 34 to the axial direction. COPYRIGHT: (C)2013,JPO&INPIT

Description

technical field [0001] The present invention relates to a cylindrical vibration isolator having a structure in which an inner shaft member and an outer cylindrical member are elastically connected by a main body rubber elastic body. Background technique [0002] Conventionally, a cylindrical vibration isolator has been known as a type of vibration isolator that is interposed between members constituting a vibration transmission system and that connects these members in a vibration-isolating manner. This cylindrical vibration isolator has a structure in which an inner shaft member and an outer cylindrical member that is overlaid on the inner shaft member at a predetermined interval are elastically connected to each other by a cylindrical main body rubber elastic body. For example, Japanese Unexamined Patent Publication No. 60-14627 (Patent Document 1) is such a cylindrical vibration isolator. [0003] In addition, in the cylindrical vibration isolator, stopper rubber is some...

AI Technical Summary

Problems solved by technology

[0004] However, in order to satisfy required performances such as spring characteristics and durability, it is desirable to ensure a certain amount of protruding height of the stopper rubber in the axial direction, and when the stopper rubber is pushed toward the vehicle body, the The stopper rubber sometimes elastically deforms in a way that overwhelms the sandwich (between the inner axle member and the vehicle body)

As a result, the tip part of the stopper rubber that is crushed and sandwiched is bitten between the axial end surface of the inner shaft member and the vehicle body, and there is a possibility of poor installation to the vehicle or damage to the spring characteristics in the axial direction and the durability of the main rubber elastic body. adverse effects of sex

[0005] In addition, like the structure shown in Patent Document 1, such a stopper can be avoided by securing a large distance between the inner shaft member and the outer cylinder member to such an extent that the stopper rubber elastically deforms and does not bite into it. However, in this case, if the connection area of ​​the inner shaft member to the vehicle body is to be sufficiently secured, it is difficult to avoid the increase in diameter of the outer cylinder member.

However, the size of the outer cylinder member is often limited by the shape of the mounting structure (fitting hole, etc.) on the vehicle side. In the case where the recent vehicle structure that requires high miniaturization and weight reduction does not allow the diameter of the outer cylinder member to be increased, avoidance is required. Other solutions for stopper rubber bites

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