| 摘要 |
PURPOSE:To improve a speed change response property in the direction of expanding the effective radius of the half body of a movable pulley by a method wherein a pushing force due to the hydraulic pressure of advancing direction, which is applied to a piston, is made bigger than the same of a retreating direction. CONSTITUTION:The relation of A2-A1>A1 is satisfied between the pressure receiving area A1 of the side of first hydraulic pressure chamber 501 and the same area A2 of the side of second hydraulic pressure chamber 502 in the piston 49 of a driving V-pulley 40 while the relation of B2 -B1>B1 is satisfied between the pressure receiving area B1 of the side of first hydraulic pressure chamber 621 and the same area B2 of the side of second hydraulic pressure chamber 622 in the piston 61 of a following pulley 41. According to this method, the advancing force due to the hydraulic pressure of the half bodies 47, 59 of respective movable pulleys may be made bigger than the retreating force at all times and, accordingly, the speed response property in the direction of expanding the effective radii of the half bodies of respective movable pulleys may be improved even if a force to shorten the effective radii of the half bodies 47, 59 of each movable pulleys due to a centrifugal force acting on the V-belt 42 is being applied. |
