Patent ID: 8974347
Filing Date: 2015-03-10
Classification: F16H,Y10T

Abstract:
1. A fluid pressure control device for an automatic transmission that transfers power from a motor via a friction engagement element, comprising: a first pump actuated by the power from the motor; a regulator valve that regulates a pressure of a working fluid pumped from the first pump; a linear solenoid valve that (i) receives the regulated working fluid by the regulator valve, (ii) further adjusts a pressure of the received regulated working fluid and (iii) outputs the adjusted working fluid to a fluid pressure chamber of the friction engagement element; a first flow passage connecting an output port of the linear solenoid valve and a switcher; a second flow passage connecting the switcher and the fluid pressure chamber of the friction engagement element; a second pump actuated by supply of electric power and capable of supplying the working fluid to the second flow passage, when connection between the first flow passage and the second flow passage is blocked by the switcher; and a pressure accumulator that accumulates the pressure of the working fluid, wherein the switcher switchably establishes and blocks connection between the first flow passage and the second flow passage, and an input passage to the accumulator is located within the first flow passage.