US3756357A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shock absorber and valve assembly
Assignee: Tenneco Automotive Europe BVBA
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Filing: 1971-12-30
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Granted: 1973-09-04
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Expires: 1991-12-30
Abstract
Abstract A hydraulic direct-acting telescopic shock absorber having an improved valve mechanism incorporating a plurality of valve disks each having flow control orifices which function to reduce the hydraulic ''''swish'''' noise produced during operation of the shock absorber.
Inventors
- 👤 K Graff
- 👤 J Winjnhoven
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:03
CPC Classifications
F; F16; F16F; F16F9/00; F16F9/32; F16F9/34; F16F9/341; F16F9/348; F16F9/3484; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7847
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
289 words
In combination in a hydraulic shock absorber, a pressure cylinder, a piston reciprocable within said cylinder and separating the interior thereof into first and second chambers, means defining at least one axially extending fluid passage in said piston and communicating said chambers, a valve assembly on said piston for controlling the flow of fluid through said passage, said valve assembly including an annular axially extending valve seat on one axial end of said piston and spaced radially outwardly from said passage, a first valve disc disposed directly adjacent said one end of said piston and having one axial side thereof adapted for engagement with said valve seat, a first fluid flow orifice extending axially through said first valve disc and arranged in general serial communication with said fluid passage in said piston, a spring assembly resiliently biasing said first valve disc axially toward said piston, whereby said one axial side of said first valve disc is engaged with said valve seat to block fluid flow between said valve seat and said first valve disc, a second annular valve disc disposed between and extending generally radially of said first valve disc and said spring assembly, a second fluid flow orifice extending axially through said second valve disc and having at least a portion thereof displaced generally radially from said first flow orifice and communicating with one of said chambers defined by the confronting axial sides of said first valve disc and said spring assembly, said passage and said first and second fluid flow orifices being serially communicable, whereby fluid may pass from one of said chambers axially through said passage and thereafter axially through said first orifice and finally radially through said second orifice into the other of said chambers.
Claim 2
Dependent Claim
289 words
In combination in a hydraulic shock absorber, a pressure cylinder, a piston reciprocable within said cylinder and separating the interior thereof into first and second chambers, means defining at least one axially extending fluid passage in said piston and communicating said chambers, a valve assembly on said piston for controlling the flow of fluid through said passage, said valve assembly including an annular axially extending valve seat on one axial end of said piston and spaced radially outwardly from said passage, a first valve disc disposed directly adjacent said one end of said piston and having one axial side thereof adapted for engagement with said valve seat, a first fluid flow orifice extending axially through said first valve disc and arranged in general serial communication with said fluid passage in said piston, a spring assembly resiliently biasing said first valve disc axially toward said piston, whereby said one axial side of said first valve disc is engaged with said valve seat to block fluid flow between said valve seat and said first valve disc, a second annular valve disc disposed between and extending generally radially of said first valve disc and said spring assembly, a second fluid flow orifice extending axially through said second valve disc and having at least a portion thereof displaced generally radially from said first flow orifice and communicating with one of said chambers defined by the confronting axial sides of said first valve disc and said spring assembly, said passage and said first and second fluid flow orifices being serially communicable, whereby fluid may pass from one of said chambers axially through said passage and thereafter axially through said first orifice and finally radially through said second orifice into the other of said chambers.
Claim 3
Dependent Claim
41 words
The invention as set forth in claim 1 wherein said first orifice means is generally axially aligned with said passage and wherein said second fluid flow orifice provides less flow rEsistance to fluid passing therethrough than said first fluid flow orifice.
Claim 4
Dependent Claim
20 words
The invention as set forth in claim 1 wherein said spring assembly comprises a coil spring mounted on said piston.
Claim 5
Dependent Claim
21 words
The invention as set forth in claim 1 wherein said spring assembly comprises at least one spring disc on said piston.
Claim 6
Dependent Claim
73 words
The invention as set forth in claim 1 which includes a second valve assembly on said piston substantially identical to said first defined valve assembly and serially arranged therewith, whereby fluid flowing from one of said chambers will sequentially flow through said passage, said first and second orifices of the said first defined valve assembly, the first and second orifices of the second valve assembly and thereafter into the other of said chambers.
Claim 7
Dependent Claim
34 words
The invention as set forth in claim 1 which includes a generally flat annular element interposed between said spring element and said second valve disc and defining in part said second fluid flow orifice.
Claim 8
Dependent Claim
34 words
The invention as set forth in claim 1 wherein a portion of said first valve disc is offset axially toward one end of said passage and has said first fluid flow orifice formed therein.
Claim 9
Dependent Claim
22 words
The invention as set forth in claim 1 wherein said valve assembly is operable during a rebound cycle of the shock absorber.
Claim 10
Dependent Claim
86 words
The invention as set forth in claim 1 which includes means defining a second flow passage in said piston communicating with said first mentioned flow passage, a second valve assembly substantially identical to said first defined valve assembly and serially arranged therewith, whereby fluid flowing from one of said chambers will sequentially flow through said passage, said first and second orifices of the said first defined valve assembly, the first and second orifices of the second valve assembly and thereafter into the other of said chambers.
Claim 11
Dependent Claim
29 words
The invention as set forth in claim 9 which includes partition means for separating fluid flow between said first and second passages from the interior of said pressure cylinder.
Claim 12
Dependent Claim
131 words
The invention as set forth in claim 10 wherein said partition means comprises a generally cylindrically shaped enclosure arranged concentrically of said pressure cylinder, said enclosure being mounted on said piston member and comprising a generally axially extending annular section and a radially extending section, said radially extending section having said second fluid passage extending therethrough, means providing a valve seat for said second passage, said second valve assembly including first and second valve discs substantially identical to said first and second valve discs, respectively of said first defined valve assembly and being serially arranged with respect to said first and second valve discs of said first valve assembly, with all of said valve discs being cooperable to reduce the swish noise produced during the rebound cycle of said shock absorber.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-03 | 1977-03-05 | 1977-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-03 | 1981-03-05 | 1981-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-03 | 1985-03-05 | 1985-09-04 | $7700.00 | Window Closed / Lapsed |