Controllable vibration damper for motor vehicles
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United States of America Patent
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May 19, 2020
Grant Date -
Oct 27, 2016
app pub date -
Dec 17, 2014
filing date -
Dec 17, 2013
priority date (Note) -
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status (Latency Note)
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Abstract
A controllable vibration damper may include a cylinder tube with hydraulic fluid, a piston movable axially within the cylinder tube along an axis and that divides the cylinder tube into two working spaces, a piston rod parallel to the cylinder tube axis and connected at one end to the piston, fluid passages from one working space into another working space, a first valve subassembly on a first fluid passage for damping piston movement in a first direction, and a second valve subassembly on a second fluid passage for damping piston movement in a second direction. Each valve subassembly may include a valve disk seated on a valve seat in a closed position and spaced apart from the valve seat in an open position, as well as a pilot chamber containing an adjustable pressure that pushes the valve disk into the closed position. One of the pilot chambers may be delimited by a base, a cylindrical side wall fixed relative to the base and arranged coaxially with the cylinder tube axis, and a dimensionally stable cover that is held radially within the cylindrical side wall and can be moved parallel to the cylinder tube axis.
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