| 摘要 |
PURPOSE:To improve transmission efficiency by regulating oil pressure in a load thrust control oil chamber to a load oil pressure corresponding to torque produced through an engine, and correcting the load oil pressure corresponding to the magnitude of speed change ratio when the speed change ratio is higher than a maximum speed change ratio. CONSTITUTION:An electronic controller 60 regulates oil pressure in a load thrust control oil chamber 17 through a control valve 45 corresponding to torque produced from an engine 1. Since maximum speed change ratio oil pressure is fed through a control valve 43 into a speed change ratio control oil chamber 16 when the engine 1 starts or stalls, apparent speed change ratio exceeds over the maximum speed change ratio upon slippage of a belt 15. In this case, the controller 60 increases load oil pressure through the control valve 45 corresponding to the magnitude of speed change ratio and eliminates slippage of belt quickly. Consequently, transmission efficiency of a continuously variable transmission and durability of V-belt can be improved.
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