| 摘要 |
PURPOSE:To improve efficiency of an oil pump by providing two regulator valves of different set pressures in a hydraulic circuit for supplying a necessary oil pressure to each of a fluid transmitting device, a hydraulic clutch and pulleys. CONSTITUTION:A hydraulic circuit is provided with a secondary pressure valve 31 and a clutch pressure valve 34, and pressure oil to be discharged from an oil pump 30 is supplied directly from an oil passage 47 to 46 to a primary and a secondary pulley 7, 9 which require the highest pressure oil. For a hydraulic clutch 21 which requires a middle-level pressure oil, an oil pressure is reduced through the valve 31, adjusted through the clutch pressure valve 34, and supplied by an oil passage 37. For a fluid coupling 1 which requires the lowest pressure oil, an oil pressure is reduced through both valves, and supplied from oil passages 54, 58. Thus pressure oil is supplied at a necessary and sufficient pressure, so oil pressure loss in the hydraulic circuit is effectively restricted, and efficiency of an oil pump 30 can be improved.
|
