US4960188A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Single-tube vibration damper of variable damping force
Assignee: ZF Friedrichshafen AG
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Filing: 1989-09-11
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Granted: 1990-10-02
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Expires: 2009-09-11
Abstract
Abstract The invention provides a single-tube vibration damper of variable damping force which consists of simple and easily produced components and permits problem-free assembly. This is achieved in that the cylinder comprises an open cylinder end provided with the cylinder diameter and is arranged therewith on the side remote from the piston rod exit in the container. The inflow passages for a damping device externally fitted on the container are formed by an annular space present between cylinder and container and divided by means of seal.
Inventors
- 👤 Felix Wossner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:38
CPC Classifications
F; F16; F16F; F16F9/00; F16F9/32; F16F9/36; F16F9/06; F16F9/061; F16F9/3207; F16F9/3235
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
243 words
A single-tube vibration damper of variable damping force comprising: a cylinder (1) containing damping fluid, and having a first end and a second end (23), the second end (23) forming an opening having the diameter of the cylinder (1), a damping piston (3) slideably arranged in the cylinder (1) and separating the cylinder (1) into two working chambers (7, 8) each of which contains said damping fluid, a piston rod (2) connected to the damping piston (3), the piston rod (2) exiting the cylinder (1) at the first end thereof, means forming a gas chamber (11) which contains a gas filling under pressure, a separator piston (9) slideably arranged in the cylinder (1), the separator piston (9) being sealed to the cylinder (1),and separating the gas chamber (11) from the working chambers (7, 8) containing said damping fluid, a container (6) at least partially surrounding the cylinder (1) and forming an annular space (12) between the container (6) and the cylinder (1), controllable damping means (18) having damping fluid flow passages (15, 17) connecting the two working chambers (7, 8) through wall openings (14, 16) of the cylinder (1), said passages (15, 17) being formed by the annular space (12) between the container (6) and the cylinder (1) and a sealing (13) dividing the annular space (12) into two areas (15, 17) each of which is connected through at least one of the wall openings to one of the working chambers (7, 8).
Claim 2
Dependent Claim
243 words
A single-tube vibration damper of variable damping force comprising: a cylinder (1) containing damping fluid, and having a first end and a second end (23), the second end (23) forming an opening having the diameter of the cylinder (1), a damping piston (3) slideably arranged in the cylinder (1) and separating the cylinder (1) into two working chambers (7, 8) each of which contains said damping fluid, a piston rod (2) connected to the damping piston (3), the piston rod (2) exiting the cylinder (1) at the first end thereof, means forming a gas chamber (11) which contains a gas filling under pressure, a separator piston (9) slideably arranged in the cylinder (1), the separator piston (9) being sealed to the cylinder (1),and separating the gas chamber (11) from the working chambers (7, 8) containing said damping fluid, a container (6) at least partially surrounding the cylinder (1) and forming an annular space (12) between the container (6) and the cylinder (1), controllable damping means (18) having damping fluid flow passages (15, 17) connecting the two working chambers (7, 8) through wall openings (14, 16) of the cylinder (1), said passages (15, 17) being formed by the annular space (12) between the container (6) and the cylinder (1) and a sealing (13) dividing the annular space (12) into two areas (15, 17) each of which is connected through at least one of the wall openings to one of the working chambers (7, 8).
Claim 3
Dependent Claim
40 words
A vibration damper according to claim 1, wherein the cylinder (1) comprises in the region of the second end (23) a sealing element (19, 21, 22) which is arranged in sealing manner on an inner surface of the container (16).
Claim 4
Dependent Claim
32 words
A vibration damper according to claim 2, wherein the sealing element (19, 21, 22) is formed by a sealing ring (21) and is arranged in a groove (25) of the cylinder (1).
Claim 5
Dependent Claim
37 words
A vibration damper according to claim 3, wherein the container (6) comprises in the region of the sealing ring (21) a step adapted to the end of the cylinder (1) and provided with a joint face (24).
Claim 6
Dependent Claim
42 words
A vibration damper according to claim 1, wherein with the container (6) there is connected a connection plate (26) in which said damper means (18) is arranged with two separately actuatable damping valves (27, 28) acting in the traction and compression directions.
References Cited (Backward Citations)
US725456A
Cited
US2036623A
Cited
GB806307A
Cited
GB1242804A
Cited
US4162062A
Cited
JPS5830541A
Cited
GB2164723A
Cited
DE3434877A1
Cited
FR2596124A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-10-01 | 1994-04-02 | 1994-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-10-01 | 1998-04-02 | 1998-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-10-01 | 2002-04-02 | 2002-10-02 | $7700.00 | Window Closed / Lapsed |