Antivibration device

Patent metadata

Field	Value
Publication number	US-10520058-B2
Application number	US-201715846670-A
Country	US
Kind code	B2
Filing date	Dec 19, 2017
Priority date	Dec 21, 2016
Publication date	Dec 31, 2019
Grant date	Dec 31, 2019

Abstract

A junction with an antivibration base body joined to its outer periphery is equipped with a chamfer portion where a corner connecting a flange portion to the junction is removed, a base portion connected to the chamfer portion in the axial direction, and an end portion connected to the base portion in the axial direction. At the base portion, a first projection plane made by being projected in a first direction orthogonal to the axis is substantially the same in area as a second projection plane made by being projected in a second direction orthogonal to the axis and the first direction. At the end portion, the area of the second projection plane is set to be larger than the area of the first projection plane.

First claim

The invention claimed is:

1. An antivibration device comprising:
a shaft-shape first fixture extending along an axis;
a sleeve-shape second fixture having on at least one side an opening larger than an external shape of the first fixture;
an antivibration base body including a rubber elastic body and joined at least to the first fixture and the opening of the second fixture; and
a restriction member secured to the second fixture for restraining the relative displacement of the first fixture;
wherein the first fixture is equipped with a junction having the antivibration base body joined to an outer periphery;
a flange portion connected to the junction and having the antivibration base body joined; and
a stopper portion including the rubber elastic body covering the flange portion and facing the restriction member;
wherein the junction is equipped with a chamfer portion where a corner connecting the flange portion and the junction is removed;
a base portion connected to the chamfer portion in the axial direction; and
an end portion connected to the base portion in the axial direction, wherein said axis extends through said base and said end portion and wherein outer peripheral surfaces of the end portion connect along the axis; and
wherein at the base portion, a first projection plane made by being projected in a first direction orthogonal to the axis is substantially the same in area as a second projection plane made by being projected in a second direction orthogonal to the axis and the first direction; and
wherein the end portion is set to have the area of the second projection plane being larger than the area of the first projection plane;
the flange portion is equipped with a pair of wall portions covered with the rubber elastic body and protruding in the axial direction on a side opposite to the junction to form the stopper portion;
the pair of wall portions face each other with the axis between the pair of wall portions in the first direction or the second direction;
the pair of wall portions are equipped with extension portions respectively connected to two lateral sides on one side and extending in a direction to come close to each other; and
edge portions of the extension portions are disposed with a gap between the edge portions.

2. The antivibration device according to claim 1 , wherein the pair of wall portions are arranged in the first direction.

3. The antivibration device according to claim 1 ,
wherein the antivibration base body is equipped with a connection portion surrounding a portion which, of the first fixture, extends from the base portion through the chamfer portion to the flange portion; and
a leg portion connected to the connection portion and closing the opening of the second fixture; and
wherein in a section including the axis, an outer peripheral surface of the junction is inclined, at a radially inside position of a boundary between the leg portion and the connection portion, relative to the axis to come close to the axis with distance from the flange portion.

Assignees

• Toyo Tire & Rubber Co
• Toyo Tire Corp

Inventors

• Ikawa Tatsuki

Classifications

• F16F2228/06

  Stiffness · CPC title

• F16F13/101

  characterised by buffering features or stoppers · CPC title

• B60K5/1233

  comprising protective elements, e.g. for protecting against heat, dust · CPC title

• B60K5/1291

  Supports comprising stoppers · CPC title

• F16F13/103 Primary

  characterised by method of assembly, production or treatment · CPC title