Brakes – Internal-resistance motion retarder – Valve structure or location
Reexamination Certificate
2001-09-10
2003-11-25
Graham, Matthew C. (Department: 3613)
Brakes
Internal-resistance motion retarder
Valve structure or location
Reexamination Certificate
active
06651788
ABSTRACT:
FIELD OF THE INVENTION
The invention relates to a bottom valve, defined in the preamble of claim
1
, for a motor-vehicle double-tube shock absorber.
BACKGROUND OF THE INVENTION
As regards such a bottom valve, the quantity of oil displaced by the piston dipping into the oil generates the pressure-damping force. In general this feature is implemented using variably prestressed valves, disks or packs of disks in cooperation with boreholes and/or similar aperture's cross-sections.
SUMMARY OF THE INVENTION
The objective of the invention is to create a bottom valve also suitable for higher damping forces and exhibiting the feature that the damping characteristic line can be adjusted between the shock absorber's compression speed of 0 m/s and the opening point OP of the main damping valve.
This goal is attained by a bottom valve includes a main damping valve for the main-force control borehole and a bypass control-borehole which determines the damping behavior before the main damping valve is opened. A prestressed bypass valve acting as a pressure relief valve cooperates with this bypass borehole. By appropriately positioning this bypass valve and/or selecting the prestressing spring for it, it is possible to attain a desired damping characteristic line until the main damping valve is opened. Advantageously the bypass valve shall be set at a fixed prestressing force at its adjustment height relative to the control borehole using an adjustment bolt accessible outside the shock absorber.
REFERENCES:
patent: 4709791 (1987-12-01), Houghton
patent: 4880086 (1989-11-01), Knecht et al.
patent: 5301776 (1994-04-01), Beck
patent: 5542509 (1996-08-01), Bell
patent: 3807322 (1989-07-01), None
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patent: 4108026 (1992-09-01), None
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patent: 19706683 (1998-07-01), None
patent: 19542293 (1998-08-01), None
patent: 19722216 (1999-08-01), None
patent: 19724328 (2000-08-01), None
patent: 0542282 (1993-05-01), None
patent: 0561404 (1993-09-01), None
Graham Matthew C.
Lowe Hauptman & Gilman & Berner LLP
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