Power steering system
AssigneeTRW Fahrwerksysteme GmbH & Co. KG
InventorUlrich Wienecke
Life of this patent
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Abstract
A power steering system comprises a rotary slide valve which has a housing, an input shaft and an output shaft which can be rotated relative to each other to a limited extent. A centering piston is provided which is non-rotatably and axially movably connected with the input shaft and delimits a pressure space in the housing. The rotary slide valve further comprises a centering ring which is non-rotatably connected with the output shaft, and an inlet to the pressure chamber. The pressure chamber has a controlled outlet. There is also proposed a method of operating such a power steering system.
Claims14
A power steering system comprising a rotary slide valve which has a housing, an input shaft and an output shaft which can be rotated relative to each other to a limited extent, a centering piston which is non-rotatably and axially movably connected with said input shaft and delimits a pressure space in said housing, a centering ring which is non-rotatably connected with said output shaft, and an inlet to said pressure chamber, said pressure chamber having a controlled outlet.
A method of operating a power steering system comprising a rotary slide valve which has a housing, an input shaft and an output shaft which can be rotated relative to each other to a limited extent, a centering piston which is non-rotatably and axially movably connected with said input shaft and delimits a pressure space in said housing, a centering ring which is non-rotatably connected with said output shaft, and an inlet to said pressure chamber, said pressure chamber having a controlled outlet,
- said centering piston being urged against said centering ring by a force which substantially results from a difference between a pressure in said pressure space and a return pressure on the side of said centering piston facing said centering balls, said cut-off valve opening said outlet from said pressure space only when said pressure in said pressure space exceeds a first pressure threshold.
Dependencies are inferred from the claim text.