Brakes – Internal-resistance motion retarder – Thrust member or piston structure
Patent
1997-03-14
1998-09-22
Oberleitner, Robert J.
Brakes
Internal-resistance motion retarder
Thrust member or piston structure
18832215, F16F 900
Patent
active
058101306
ABSTRACT:
A suspension system damper includes a hydraulic rebound cut-off feature without unduly limiting active travel. A spring separates a rebound cut-off piston from the rod guide. The rebound cut-off piston has an oversized center hole. The outer periphery of the rebound cut-off piston is sized for a close slip-fit within the tube with a number of small slots acting as restrictive and tunable flow control features when the system enters a cut-off mode. When the top of the damping piston assembly comes into contact with the rebound cut-off piston, the cut-off mode is entered. Hydraulic flow is cut-off by blocking fluid flow through the center hole. This generates hydraulic loads on the piston rod by virtue of the high pressure generated between the rebound cut-off piston and the rod guide. Fluid is restricted to exiting the rebound cut-off region via the small slots in the outer periphery of the damping piston assembly. As fluid flow is restricted, the extension travel of the damper is slowed and is positively limited by mechanical engagement of the rebound cut-off piston with the rod guide assembly. Upon reaching full extension and transitioning to a compression stroke, the damping piston assembly separates from the rebound cut-off piston permitting substantially free flow through the center hole so that the rebound cut-off feature does not generate loads at the commencement of compression directed travel.
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General Motors Corporation
Oberleitner Robert J.
Schwartz Chris
Sedlar Jeffrey A.
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