| 摘要 |
PURPOSE:To correctly control the secondary pressure and reduce vibration noises by providing an orifice and a check valve for reducing pulsations in a circuit guiding the secondary pressure to a pilot oil pressure chamber and a feedback oil pressure chamber. CONSTITUTION:When the solenoid current Is flows from a secondary pressure controller 71, the pilot pressure corresponding to it is generated, the set pressure of a secondary control valve 50 is changed so that the feedback oil pressure equal to the secondary pressure Ps is balanced with the pilot oil pressure and the spring force, and the secondary pressure Ps is linearly changed against the solenoid current Is. Pulsations generated by the rotation of an oil pump 34 are superimposed on the secondary pressure Ps of oil paths 41, 46, 47, an orifice 48 and a check valve 49 cuts off the pulsations, and the effect of the pulsations on a feedback oil pressure chamber 51a and a pilot oil pressure chamber 51b is reduced. |
