AUTOMATIC SPEED CHANGE GEAR FOR CAR

摘要

PURPOSE:To accomplish favorable speed change operation by detecting a rotating speed change rate from rotating elements to control the feed of oil pressure to frictional engagement elements in such a manner that the change rate can follow the predetermined setpoint. CONSTITUTION:An automatic speed change gear 1 is provided with a rotating speed detector for detecting the rotating speed of a reverse sun gear 11 to be input to a computer and with a setpoint setting device, to which a rotating speed change rate is input not to cause excessive shock or slip at the time of speed change operation, which is adapted to input the rate as the setpoint to the computer, wherein the feed of oil pressure to frictional engagement elements is controlled in such a manner that the rotating speed change rate of the reverse sun gear follows the above setpoint. Thus, an excessive shock or excessive slip of the frictional engagement elements at the time of speed change operation can be prevented effectively to accomplish favorable speed change operation.