| 摘要 |
<p>PURPOSE:To conduct clutch engagement and release with excellent timing by feeding oil pressure to a first oil chamber at a second step after a first step at which oil pressure is discharged, feeding oil pressure to a second oil chamber at least at the first step. CONSTITUTION:In the case of 2nd-3rd speed shift steps, at a first oil chamber 5, oil pressure is discharged at the 2nd speed. At this time, oil pressure is fed to a second oil chamber 11. When shift is made to the 3rd speed, the oil chamber 5 is fed with oil pressure, and a first piston 6 energizes a first friction plate 7, and at that time, a second friction plate 12 is already engaged. In the case of 3rd-2nd down shift operation from this state, the oil pressure of the first oil chamber 5 is discharged, and the interim remaining pressure of the oil chamber 5 is all discharged at the oil chamber 11 by the reaction of the oil pressure, so the first friction plate 7 is smoothly released without receiving the bad effect of centrifugal force.</p> |
