HYDRAULIC CONTROL DEVICE FOR AUTOMATIC TRANSMISSION FOR VEHICLE WITH HIGH ACCURACY REVERSE INHIBITION SYSTEM

摘要

A hydraulic control device having a reverse inhibition system and applicable to an automatic transmission for a vehicle of a type including a friction engaging means for a reverse stage having a reverse exclusive hydraulic pressure chamber adapted to be supplied with a hydraulic pressure only for setting up the reverse stage, the reverse inhibition system having a reverse inhibition valve biased to a reverse inhibition position by a control hydraulic pressure for interrupting supply of hydraulic pressure to the reverse exclusive hydraulic pressure chamber and to a reverse allowance position by a hold hydraulic pressure for allowing the supply of hydraulic pressure to the reverse exclusive hydraulic pressure chamber, wherein the hydraulic pressure supplied to the reverse exclusive hydraulic pressure chamber is used for the hold hydraulic pressure.