| 摘要 |
PURPOSE:To reduce impact upon speed change by coupling an accumulator common to two friction elements to the downstream of an orifice. CONSTITUTION:Upon switching of a shift valve 3 from the condition shown on the lower half section of drawing to that shown on upper half section, the line pressure PL is fed through an orifice 8 in common circuit 4 to first friction element 1 as the fastening pressure Pc from the circuit 5 while fed as the releasing pressure PR from the circuit 6 into the release chamber 7a of a servo 7 thus to release the second friction element 2. Here, the accumulator 9 is shared by both elements 1, 2. During this up-shift speed change, the accumulator 9 will set new shelves alpha2, beta2 synchronized prior to the shelf alpha1 due to the servo stroke to the first and second friction element transmission torques. Consequently, speed change impact can be reduced. |
