| 摘要 |
PURPOSE:To obtain a small-sized V-belt type speed change gear by discharging one of feedback oil pressures fed back to the first regulator valve at the time of up-shift or down-shift for levelling up the first line pressure. CONSTITUTION:The first regulator valve 61 feeds its output oil pressure back to lands 621 and 622. When the feedback pressure is received only by the land 621, the case is called the first stage, and when the same is received by both lands 621 and 622, the case is called the second stage. At the time of up-shift or down-shift, a reduction ratio control valve 72 governs the oil pressure in one feedback oil passage 32. The pressure in the oil passage 32 is discharged through a drain port 714 at the time of up-shift, and through a drain port 710 at the time of down-shift, and the feedback oil pressure given to the land 622 is discharged. Consequently, the first line pressure is levelled up to the first stage pressure. |
