| 摘要 |
PURPOSE:To obtain the small size and the low cost fuel for a speed-change gear by almost equalizing the pressure-receiving area of the servo of a drive sheave with that of a driven sheave and generating the first line pressure and the second line pressure lower than the first for controlling. CONSTITUTION:The pressure-receiving area of a hydraulic servo D of a drive sheave is almost equalized with that of a hydraulic servo C of a driven sheave. A hydraulic control device is composed of an oil-pressure generating source 50, an oil-pressure regulation unit 60 to output a line pressure, a reduction ratio control unit 70, a shift sequence valve 78, a line-pressure control mechanism 80, and a manual valve 90. The oil-pressure regulation unit 60 is composed of the first regulator valve 61 to generate the first line pressure and the second regulator valve 65 to generate the second line pressure lower than the first line pressure. When the reduction ratio control unit 70 supplies oil pressure to the hydraulic servo D, the shift sequence valve 78 supplies the second line pressure to the hydraulic servo C. |
