HYDRAULIC CONTROL APPARATUS FOR AUTOMATIC TRANSMISSION

摘要

To alleviate a shift shock of an automatic transmission provided with a tw in clutch. An automatic transmission is provided with gear trains equal in number to the number of speed ratios between a primary shaft SP and a counter shaft SC, and a first hydraulic clutch CL1 and second hydraulic clut ch CL2 interrupt and connect the transmission of rotation between a crankshaft SI and the transmission. A changeover valve is provided to connect the pressure of a working fluid to any one of the first and second clutches CL1, CL2. A pair of orifice control valves are disposed between the changeover valve and the first clutch CL1 and between the changeover valve and the second clutch CL2, respectively. A pair of accumulators are disposed between the changeover valve and the first clutch CL1 and between the changeover valve and the second clutch CL2, respectively.