US3642268A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High-damping resilient bushing
Assignee: Aerojet Rocketdyne Holdings Inc
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Filing: 1970-06-12
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Granted: 1972-02-15
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Expires: 1990-06-12
Abstract
Abstract A resilient bushing is composed of inner and outer rigid concentric sleeves and a molded elastomeric insert radially compressed therebetween, said insert containing a pair of recesses that cooperate with the outer sleeve to form fluidcontaining reservoirs or pockets. The reservoirs contain a fluid such as silicone oil and are in fluid communication with one another through a suitable tube or orifice. When the bushing is deflected in a radial direction through the pockets, the fluid provides high damping in that radial direction for increased vibration isolation. Various types of orifices or tubes can be used to vary the damping properties of the bushing.
Inventors
- 👤 Gary L Hipsher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:44
CPC Classifications
F; F16; F16F; F16F13/00; F16F13/04; F16F13/06; F16F13/08; F16F13/14; F16F1/00; F16F1/36; F16F1/38; F16F1/387
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
86 words
A resilient bushing including a tubular rigid inner sleeve, a tubular rigid outer sleeve disposed around and radially spaced from said inner sleeve, and a cured annular elastomeric insert radially compressed between the two sleeves said insert having a plurality of separate recesses that form pockets that are separated from one another, a fluid filling at least two of said pockets and means providing restricted fluid communication between the fluid filled pockets whereupon the bushing exhibits high damping in the radial direction through the fluid-filled pockets.
Claim 2
Dependent Claim
86 words
A resilient bushing including a tubular rigid inner sleeve, a tubular rigid outer sleeve disposed around and radially spaced from said inner sleeve, and a cured annular elastomeric insert radially compressed between the two sleeves said insert having a plurality of separate recesses that form pockets that are separated from one another, a fluid filling at least two of said pockets and means providing restricted fluid communication between the fluid filled pockets whereupon the bushing exhibits high damping in the radial direction through the fluid-filled pockets.
Claim 3
Dependent Claim
33 words
The bushing according to claim 1 wherein said fluid-filled pockets are defined by the inner wall of the outer rigid sleeve and by recesses formed in the outer surface of the elastomeric insert.
Claim 4
Dependent Claim
15 words
The bushing according to claim 2 wherein the insert is bonded to the outer sleeve.
Claim 5
Dependent Claim
21 words
The bushing according to claim 1 wherein the bushing contains two fluid filled pockets that are diametrically opposed to one another.
Claim 6
Dependent Claim
14 words
The bushing according to claim 4 wherein said two pockets are of equal dimensions.
Claim 7
Dependent Claim
40 words
The bushing according to claim 4 wherein each pocket has an axial length of between about one-third and two-thirds the length of the bushing and has an angular width of between about 60* and about 120* around the periphery thereof.
Claim 8
Dependent Claim
30 words
The bushing according to claim 1 wherein said damping fluid is selected from the group consisting of silicone oil, polyglycols alone or admixed with water, and low molecular weight polymers.
Claim 9
Dependent Claim
18 words
The bushing according to claim 1 wherein the fluid passageway between pockets contains a fluid flow restriction means.
Claim 10
Dependent Claim
14 words
The bushing according to claim 8 wherein said resitriction means comprises a flapper valve.
Claim 11
Dependent Claim
22 words
The bushing according to claim 4 wherein the outer surface of the insert is provided with voids in the low damping direction.
Claim 12
Dependent Claim
16 words
The bushing according to claim 10 wherein these voids extend the entire length of the bushing.
Claim 13
Dependent Claim
21 words
The bushing according to claim 10 wherein these voids are pockets formed by the outer sleeve and recesses in the insert.
Claim 14
Dependent Claim
81 words
A resilient bushing comprising inner and outer radially spaced rigid sleeves, and a cured annular elastomeric insert radially compressed between the sleeves, said insert having a pair of diametrically opposed recesses in its outer surface, which recesses cooperate with the outer sleeve to form fluid-containing pockets, fluid in said pockets and means for permitting the restricted flow passage of fluid from one pocket to the other pocket, resulting in a high coefficient of damping in the radial direction through the pockets.
Claim 15
Dependent Claim
81 words
A resilient bushing comprising inner and outer radially spaced rigid sleeves, and a cured annular elastomeric insert radially compressed between the sleeves, said insert having a pair of diametrically opposed recesses in its outer surface, which recesses cooperate with the outer sleeve to form fluid-containing pockets, fluid in said pockets and means for permitting the restricted flow passage of fluid from one pocket to the other pocket, resulting in a high coefficient of damping in the radial direction through the pockets.
Claim 16
Dependent Claim
22 words
The bushing according to claIm 13 wherein the insert contains voids in its outer surface radially disposed 90* from the fluid-filled pockets.
Claim 17
Dependent Claim
19 words
The bushing according to claim 13 wherein the recesses are molded in to the outer surfaces of the insert.
Claim 18
Dependent Claim
22 words
The bushing according to claim 13 wherein the means for permitting restricted flow of fluid comprises an orifice interconnecting the two pockets.
References Cited (Backward Citations)
US3055687A
Cited
US3147964A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-02-14 | 1975-08-16 | 1976-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-14 | 1979-08-16 | 1980-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-14 | 1983-08-16 | 1984-02-15 | $7700.00 | Window Closed / Lapsed |