Piston/cylinder unit

Details Piston/cylinder unit Piston/cylinder unit

2006-05-23

2006-05-23

Torres, Melanie (Department: 3683)

Brakes

Internal-resistance motion retarder

Valve structure or location

C188S322220

Reexamination Certificate

active

07048100

ABSTRACT:
A piston/cylinder unit has a closed cylinder with a piston axially displaceably guided therein. The piston divides the cylinder interior into first and a second working spaces which are both filled with a fluid. A first nonreturn valve is arranged in the piston having a closing element of which is force-loaded in the closing direction. At least a portion of the first nonreturn valve is exposed to pressure in the first working space. A second nonreturn valve is also arranged in the piston and also has a closing element of which is force-loaded in the closing direction. The surface of the closing element of the first and/or second nonreturn valve acted upon by the pressure of the respective working spaces can be enlarged during the opening stroke of said nonreturn valve.

REFERENCES:
patent: 4099602 (1978-07-01), Kourbetsos
patent: 4856625 (1989-08-01), Oshida
patent: 5450933 (1995-09-01), Schuttler
patent: 5586361 (1996-12-01), Tulle et al.
patent: 5620066 (1997-04-01), Schüttler
patent: 5799759 (1998-09-01), Koch
patent: 6179100 (2001-01-01), Mintgen et al.
patent: 1459 182 (1969-01-01), None
patent: 36 42 442 (1987-08-01), None
patent: 42 39 681 (1994-06-01), None
patent: 44 47 272 (1995-07-01), None

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