Abstract A fluid damped bushing comprises an annular rubber insert radially compressed between a pair of rigid sleeves. The curved outer surface of the insert contains a pair of radially spaced voids which co-operate with the outer sleeve to form enclosed pockets. These pockets are interconnected and are filled with a suitable fluid to provide the bushing with high damping characteristics in the radial direction through the pockets. The generally parallel and planar ends of the insert are voided around the inner sleeve to form suitable recesses. The recesses are separated from the fluid pockets by relatively thin webs which flex rather than undergo compression to provide a very low spring rate in the direction through the fluid. The radial spring rate at right angles to the pockets is considerably higher and may be as much as five times as great as the spring rate through the pockets. The inner sleeve is preferably shaped to give a highly planar surface in the direction of a high spring rate. The bushing can be used, for example, as a vibration isolator between an engine and the frame of a vehicle.
A fluid-damped, resilient bushing comprising a rigid inner sleeve, a rigid outer sleeve disposed around and radially spaced from said inner sleeve and a cured elastomeric insert radially compressed between said inner and outer sleeves said insert including A. axially opposed end portions filling the radial space between said inner and outer sleeves, each radial face of said end portions having an axially inwardly extending recess in a portion of said face adjacent said inner sleeve and B. a body portion between said ends having a pair of diametrically opposed, axially extending, fluid filled cavities in the outer surface thereof, said cavities innerconnected by a restricted fluid passage, wherein the axial length of said fluid filled cavities and the axial inward extent of each of said recesses are such that only a pair of thin flexible webs of elastomeric material separate each cavity from said recesses.
Claim 2
Dependent Claim
146 words
A fluid-damped, resilient bushing comprising a rigid inner sleeve, a rigid outer sleeve disposed around and radially spaced from said inner sleeve and a cured elastomeric insert radially compressed between said inner and outer sleeves said insert including A. axially opposed end portions filling the radial space between said inner and outer sleeves, each radial face of said end portions having an axially inwardly extending recess in a portion of said face adjacent said inner sleeve and B. a body portion between said ends having a pair of diametrically opposed, axially extending, fluid filled cavities in the outer surface thereof, said cavities innerconnected by a restricted fluid passage, wherein the axial length of said fluid filled cavities and the axial inward extent of each of said recesses are such that only a pair of thin flexible webs of elastomeric material separate each cavity from said recesses.
Claim 3
Dependent Claim
35 words
The bushing as described in claim 1 wherein the longitudinal axis of said inner sleeve is parallel to but radially offset from the longitudinal axis of said bushing toward one of said fluid filled cavities.
Claim 4
Dependent Claim
64 words
The bushing as described in claim 1 wherein said inner sleeve is of generally rectangular cross-section and is disposed so as to present an area to the direction along a line through said fluid filled cavities and perpendicular to the longitudinal axis of said bushing which is smaller than the area presented to the direction along a radial line 90* from said first direction.
Claim 5
Dependent Claim
64 words
The bushing as described in claim 2 wherein said inner sleeve is of generally rectangular cross-section and is disposed so as to present an area to the direction along a line through said fluid filled cavities and perpendicular to the longitudinal axis of said bushing which is smaller than the area presented to the direction along a radial line 90* from said first direction.