Motors: expansible chamber type – With motive fluid valve – Both inlet and exhaust controlled by motive fluid pressure...
Patent
1977-12-27
1980-02-05
Cohen, Irwin C.
Motors: expansible chamber type
With motive fluid valve
Both inlet and exhaust controlled by motive fluid pressure...
91370, 13762569, F15B 1314
Patent
active
041866525
ABSTRACT:
A servo valve for a power steering booster comprises a power piston and cylinder assembly including a power piston reciprocatively movable therewithin and a spool assembly including a hollow spool for controlling selective supply and discharge of hydraulic pressures onto and from both sides of the power piston, a pair of reaction pistons slidably fitted within ends of the hollow spool to form a reaction hydraulic chamber therewithin, a reaction spring interposed between the reaction pistons, cover plates closing the ends of the hollow spool, through which a steering input transmission shaft passes, and reaction support pins of bearing rollers made with a high dimensional accuracy held in guide holes formed in the cover plates between the respective reaction pistons and partitions located at ends of a housing slidably accommodating the spool assembly and having ports for the selective supply and discharge of hydraulic pressures, thereby eliminating the high accuracy machining of parts associated with the spool to achieve the precise neutral position of the spool.
REFERENCES:
patent: 2824550 (1958-02-01), Gribler et al.
patent: 2934089 (1960-04-01), Mayers
patent: 2985146 (1961-05-01), Randol
patent: 3352210 (1967-11-01), Lucien
patent: 3444786 (1969-05-01), Forster et al.
Atsugi Motor Parts Co. Ltd.
Cohen Irwin C.
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