Patent ID: 6712725
Filing Date: 2004-03-30
Classification: F16H,Y10T

Abstract:
A hydraulic control apparatus of an automatic transmission having an input shaft with a plurality of drive gears, an output shaft with a plurality of driven gears to form transmission gear trains by meshing with the drive gears, and a plurality of switching mechanisms for switching said transmission gear trains from said input shaft to said output shaft, comprising:an input clutch for engaging and disengaging between an engine and said input shaft; a select actuator for selecting either one of said plurality of switching mechanisms to perform a switching operation; a shift actuator for performing the switching operation of said selected switching mechanism; a select position detection valve for opening and closing an oil passage under an engagement with said select actuator; a shift position detection valve for switching the oil passage under an engagement with said shift actuator, said shift position detection valve supplying an oil pressure for switching into a reverse gear stage to said select actuator when said shift actuator is actuated to a neutral position; and a forcible reverse shift valve for setting said shift actuator at a reverse gear stage by the oil pressure from said select position detection valve when said select actuator is switched to a reverse position, wherein the oil pressure is supplied to said input clutch via said shift position detection valve when the reverse gear stage is set by said shift actuator.