Shock control arrangement in hydraulic control system of automatic power transmission

摘要

In an automatic power transmission having a transmission mechanism including a fluid operated frictional unit to be actuated to make shifts between predetermined forward drive gear ratios or between the neutral and reverse drive gear positions, there is provided a hydraulic transmission control system having incorporated therein a shock control arrangement by means of which a fluid pressure lower than the fluid pressure to be supplied to the frictional unit during shifting between the neutral and reverse drive gear positions is supplied to the frictional unit during shifting between the predetermined forward drive gear ratios.