| 摘要 |
PURPOSE:To accurately control the transmitted torque capacity by providing a large oil chamber and a small oil chamber selectively fed with oil pressure and decreasing the growth factor of the pressing force against the oil pressure when the oil pressure is fed to the small chamber only. CONSTITUTION:The oil pressure for a hydraulic servo device 70 to control the transmitted torque capacity of a differential control clutch 60 is fed to a large oil chamber 76 when the necessary transmitted torque capacity of the differential control clutch 60 is large, and to a small oil chamber 78 when that is small. If oil pressure is fed to the large oil chamber 76 when the maximum transmitted torque capacity at the fourth speed stage is obtained, the change width of the servo oil pressure for control is small; if the oil pressure is fed to the small oil chamber 78, the control change width of the servo oil pressure is made large. Thereby, the change quantity of the transmitted torque capacity is decreased, and the control accuracy of the transmitted torque capacity is improved.
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