US3874487A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shock absorber
Assignee: Tenneco Automotive Europe BVBA
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Filing: 1973-06-14
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Granted: 1975-04-01
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Expires: 1993-06-14
Abstract
Abstract A compression or base valve for a shock absorber including concentrically oriented pressure and reserve cylinders defining a fluid reservoir therebetween, with the pressure cylinder having a reciprocally disposed piston therein; the compression valve being located at the lower end of the pressure cylinder and adapted to selectively communicate fluid between the pressure cylinder and the fluid reservoir; the valve including a base member extending across the lower end of the pressure cylinder and defining a central opening and a plurality of circumferentially spaced passages arranged concentrically of the central opening, a first valve member mounted above the base member and adapted to selectively close the plurality of fluid passages and a second valve member carried on a relief valve reciprocally disposed below the base member, the second valve member being movable to a first position response to low fluid pressure flowing from the pressure cylinder to the fluid reservoir and being movable to a second position in response to movement of the relief valve when relatively higher pressure fluid is communicated from the pressure cylinder to the fluid reservoir.
Inventors
- 👤 Johan H Keijzer
- 👤 Den Berg Johan V Van
- 👤 Jan M A Wijnhoven
- 👤 Louis J Jossa
- 👤 August G L Moonen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:41
CPC Classifications
F; F16; F16F; F16F9/00; F16F9/32; F16F9/34; F16F9/348; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7771; Y10T137/778
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
302 words
A compression valve for a shock absorber including a pressure cylinder having a reciprocable piston therein and a reserve tube arranged concentrically of the pressure cylinder and defining a fluid reservoir therewith, said valve including a base member disposed adjacent one end of said pressure cylinder, said base member comprising first and second passage means communicating said reservoir with said pressure cylinder, means defining first and second valve seats on said base member, a first annular valve disc adjacent one side of said base member and having a deformable peripheral portion movable toward and away from engagement with said first valve seat to selectively block fluid flow from said pressure cylinder to said reservoir through said first passage means, a second annular valve disc concentrically arranged relative to said first disc and disposed adjacent the opposite side of said base member and movable toward and away from engagement with said second valve seat to selectively block fluid flow from said reservoir to said pressure cylinder, axially movable support means supporting said second valve disc and being movable axially therewith toward and away from said second valve seat, a pair of cooperable spring elements yieldably urging said means supporting said second valve disc toward a position wherein said second valve disc is engaged with said second valve seat, with one of said spring elements being deformable to permit only a peripheral portion of said second valve disc to move away from said second valve seat under the influence of a first magnitude of fluid pressure in said pressure cylinder, and with both of said spring elements being deformable to permit said second valve disc and said means supporting the same to move axially away from said second valve seat under the influence of a second magnitude of fluid pressure in said pressure cylinder.
Claim 2
Dependent Claim
302 words
A compression valve for a shock absorber including a pressure cylinder having a reciprocable piston therein and a reserve tube arranged concentrically of the pressure cylinder and defining a fluid reservoir therewith, said valve including a base member disposed adjacent one end of said pressure cylinder, said base member comprising first and second passage means communicating said reservoir with said pressure cylinder, means defining first and second valve seats on said base member, a first annular valve disc adjacent one side of said base member and having a deformable peripheral portion movable toward and away from engagement with said first valve seat to selectively block fluid flow from said pressure cylinder to said reservoir through said first passage means, a second annular valve disc concentrically arranged relative to said first disc and disposed adjacent the opposite side of said base member and movable toward and away from engagement with said second valve seat to selectively block fluid flow from said reservoir to said pressure cylinder, axially movable support means supporting said second valve disc and being movable axially therewith toward and away from said second valve seat, a pair of cooperable spring elements yieldably urging said means supporting said second valve disc toward a position wherein said second valve disc is engaged with said second valve seat, with one of said spring elements being deformable to permit only a peripheral portion of said second valve disc to move away from said second valve seat under the influence of a first magnitude of fluid pressure in said pressure cylinder, and with both of said spring elements being deformable to permit said second valve disc and said means supporting the same to move axially away from said second valve seat under the influence of a second magnitude of fluid pressure in said pressure cylinder.
Claim 3
Dependent Claim
33 words
A compression valve as set forth in claim 1 wherein said base member is of a generally cup-shaped configuration and comprises a generally circular top section having a downwardly extending annular side section.
Claim 4
Dependent Claim
29 words
A compression valve as set forth in claim 2 wherein said first passage means comprises a plurality of flow ports formed in said top section of said base member.
Claim 5
Dependent Claim
38 words
A compression valve as set forth in claim 3 wherein said second passage means comprises a central opening formed in said top section of said base member and wherein said flow ports are circumferentially spaced around said opening.
Claim 6
Dependent Claim
40 words
A compression valve as set forth in claim 4 which includes a plurality of circumferentially spaced slots formed in said side section of said base member and adapted to communicate said fluid reservoir with said first and second passage means.
Claim 7
Dependent Claim
27 words
A compression valve as set forth in claim 4 wherein said first valve seat extends circumferentially around the upper side of said base member circumjacent said ports.
Claim 8
Dependent Claim
33 words
A compression valve as set forth in claim 6 wherein said first valve seat comprises radially spaced, concentrically oriented inner and outer valve seat sections arranged radially inwardly and outwardly of said ports.
Claim 9
Dependent Claim
35 words
A compression valve as set forth in claim 4 wherein said second valve seat is disposed on the under side of said top sections of said base member and arranged radially inwardly from said ports.
Claim 10
Dependent Claim
51 words
A compression valve as set forth in claim 4 wherein said first valve disc is operatively secured to the upper side of said top section of said base member and comprises an outer peripheral portion movable toward and away from engagement with said first valve seat for selectively closing said ports.
Claim 11
Dependent Claim
41 words
A compression valve as set forth in claim 1 wherein said means supporting said second valve disc for axial movement toward and away from said second valve seat comprises a sleeve-like valve member axially slidably movable relative to said base member.
Claim 12
Dependent Claim
20 words
A compression valve as set forth in claim 1 wherein one of said spring elements comprises a helical coil spring.
Claim 13
Dependent Claim
32 words
A compression valve as set forth in claim 1 wherein said spring elements comprise first and second helical coil springs arranged concentrically of one another and disposed below said second valve seat.
Claim 14
Dependent Claim
37 words
A compression valve as set forth in claim 4 which includes a valve pin extending axially downwardly from said base member and defining a fluid passage communicating said central opening with the underside of said base member.
Claim 15
Dependent Claim
43 words
A compression valve as set forth in claim 13 which includes a pair of concentrically oriented helical coil springs disposed below the under side of said top section of said base member and supported at the lower ends thereof by said valve pin.
Claim 16
Dependent Claim
22 words
A compression valve as set forth in claim 14 which includes a relief valve member axially slidably supported on said valve pin.
Claim 17
Dependent Claim
56 words
A compression valve as set forth in claim 15 wherein one of said helical springs is operable to resiliently bias said relief valve member toward a position restricting fluid flow through said passage, and wherein the other of said helical springs is operable to urge said second valve disc toward engagement with said second valve seat.
Claim 18
Dependent Claim
40 words
A compression valve as set forth in claim 16 which includes means cooperable with said relief valve member defining a restricted flow orifice for controlling fluid flow between the upper side of said base member and said second valve disc.
Claim 19
Dependent Claim
103 words
A compression valve as set forth in claim 1 wherein said base member is of a generally cup-shaped configuration and comprises a generally circular top section having a downwardly extending annular side section, wherein said first passage means comprises a plurality of flow ports formed in said top section of said base member, wherein said second passage means comprises a central opening formed in said top section of said base member, and which includes a plurality of circumferentially spaced slots formed in said side section of said base member and adapted to communicate said fluid reservoir with said first and second passage means.
Claim 20
Dependent Claim
65 words
A compression valve as set forth in claim 18 wherein said first valve seat extends circumferentially around the upper side of said base member circumjacent said ports and comprises radially spaced, concentrically oriented inner and outer valve seat sections, wherein said second valve seat is disposed on the under side of said top section of said base member and arranged radially inwardly from said ports.
Claim 21
Dependent Claim
170 words
A compression valve as set forth in claim 19 which includes a valve pin extending axially through said central opening and defines in part a fluid pAssage from the upper side of said base member to the under side thereof, which includes a pair of concentrically oriented helical coil springs disposed below the underside of said top section of said base member and supported at the lower ends thereof by said valve pin, which includes a relief valve member axially slidably supported on said valve pin, one of said helical springs being operable to resiliently bias said relief valve member toward a position restricting fluid flow from said passage toward said second valve disc, and the other of said helical springs being operable to urge said second valve through toward engagement with said second valve seat, and which includes an orifice disc cooperable with said relief valve member defining a restricted flow orifice for controlling fluid flow between the upper side of said base member and said second valve disc.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-31 | 1978-09-30 | 1979-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-31 | 1982-09-30 | 1983-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-31 | 1986-09-30 | 1987-04-01 | $7700.00 | Window Closed / Lapsed |