| 摘要 |
PURPOSE:To simplify the structure of a control valve by partitioning the inside of the cylinder by a piston fitted therein into a pressure receiving chamber and a pair of output pressure chambers, allowing these output pressure chambers to communicate to each other through a throttle device, and sliding a main valve according to the pressure difference between the two chambers. CONSTITUTION:A control valve 100 for aid steering of a four-wheel steering device is equipped with a piston 100, which operates upon the output pressure of the front wheel side power steering device, and a throttle control valve 112 which controls the communication throttling amount between a pair of output pressure chambers 111L, 111R whose volumes vary with displacement of the mentioned piston 110. A main valve 113 operates upon receiving as pilot pressure the oil pressure which is generated in these output pressure chambers 111L, 111R. The piston 110 displaces in compliance with the pilot pressure to be introduced to a left and a right pressure receiving chamber 122L, 122R so as to generate in the chambers 111L, 111R volume changes which are contrary to each other. |
