Vibration control bush

Patent metadata

Field	Value
Publication number	US-10865845-B2
Application number	US-201716330472-A
Country	US
Kind code	B2
Filing date	Oct 10, 2017
Priority date	Oct 31, 2016
Publication date	Dec 15, 2020
Grant date	Dec 15, 2020

Abstract

Provided is a vibration control bush configured to improve durability of a rubber elastic body. The vibration control bush includes: a shaft member that includes a spherical convex portion; a tubular member that is arranged on a radially outer side of the shaft member; and a rubber elastic body that joins the tubular member and the shaft member. The rubber elastic body is joined to a first portion and a second portion of the tubular member. The first portion is positioned on the radially outer side of the convex portion, and the diameter of the inner circumferential face gradually decreases axially outward from the center. The second portion is positioned on the axially outer side with respect to the first portion, and the diameter of the inner circumferential face gradually increases axially outward.

First claim

The invention claimed is:

1. A vibration control bush, comprising:
a shaft member that includes a shaft portion and a spherical convex portion projecting radially outward from a center of the shaft portion in an axial direction;
a tubular member arranged on a radially outer side of the shaft member; and
a rubber elastic body that joins an inner peripheral surface of the tubular member and an outer peripheral surface of the shaft member, the rubber elastic body having an end surface in the axial direction on which a recessed portion is formed, the recessed portion being recessed axially inward,
wherein the tubular member includes:
a first portion positioned on a radially outer side of the convex portion, the first portion having an inner peripheral surface whose diameter gradually decreases axially in each direction outward from a center; and
a pair of second portions positioned on axially outer sides with respect to the first portion, each second portion of the pair of second portions having an inner peripheral surface whose diameter gradually increases axially outward from the center,

wherein the rubber elastic body is joined to the first portion and each of the second portions, and
wherein on a cross-sectional plane including an axis line of the shaft portion, for each of said second portions: an angle between a line defined by an inner peripheral surface the second portion and the axis line is 45° or less, wherein the line defined by the inner peripheral surface of the second portion is a) a line extending along a linear inner peripheral surface of the second portion or b) a line passing through i) an axially outer most position at which the rubber portion contacts the inner peripheral surface of the second portion and ii) an axially inner boundary of the second portion.

2. The vibration control bush according to claim 1 ,
wherein the recessed portion has a bottom portion in the axial direction on a radially inner side of each of the second portions.

3. The vibration control bush according to claim 1 ,
wherein each of the second portions is disposed on a radially outer side of at least a part of the shaft portion.

4. The vibration control bush according to claim 1 , wherein the inner peripheral surface of the second portion is linear along a substantial portion of its length.

5. The vibration control bush according to claim 1 , wherein the inner peripheral surface of the second portion has a curved shape.

6. The vibration control bush according to claim 1 , wherein the angle between a line defined by an inner peripheral surface the second portion and the axis line is 45° or less, wherein the line defined by the inner peripheral surface of the second portion is a line passing through i) the axially outer most position at which the rubber elastic body contacts the inner peripheral surface of the second portion and ii) the axially inner boundary of the second portion.

7. The vibration control bush according to claim 4 , wherein the angle between a line defined by an inner peripheral surface the second portion and the axis line is 45° or less, wherein the line defined by the inner peripheral surface of the second portion is a line passing through i) the axially outer most position at which the rubber elastic body contacts the inner peripheral surface of the second portion and ii) the axially inner boundary of the second portion.

8. The vibration control bush according to claim 5 , wherein the angle between a line defined by an inner peripheral surface the second portion and the axis line is 45° or less, wherein the line defined by the inner peripheral surface of the second portion is a line passing through i) the axially outer most position at which the rubber elastic body contacts the inner peripheral surface of the second portion and ii) the axially inner boundary of the second portion.

Assignees

• Toyo Tire Corp

Inventors

• Niwa Satoshi

Classifications

• F16F1/393 Primary

  with spherical or conical sleeves · CPC title

• F16F1/387

  comprising means for modifying the rigidity in particular directions {(spherical or conical sleeves F16F1/393)} · CPC title

• F16F1/38 Primary

  with a sleeve of elastic material between a rigid outer sleeve and a rigid inner sleeve or pin {, i.e. bushing-type (hydraulically-damped bushes F16F13/14; suppression of vibrations in rotating systems by making use of elastomeric spring members between rotating elements, driveline torque being transmitted therebetween F16F15/126, by making use of a dynamic damping mass attached to a rotating element by means of elastomeric springs F16F15/14; pivots per se F16C11/00; elastic or yielding bearings or bearing supports F16C27/00; parts of sliding-contact bearings, e.g. bushes F16C33/04)} · CPC title

• F16F1/3732

  having an annular or the like shape, e.g. grommet-type resilient mountings · CPC title

• F16F15/08

  with rubber springs {(grommet- or bushing-type resilient mountings F16F1/3732, F16F1/38); with springs made of rubber and metal (arrangement of internal-combustion or jet-propulsion units B60K5/12; mounting of propulsion plants on vessels B63H21/30; mounting of vehicle drivers' cabs B62D33/0604)} · CPC title