| 摘要 |
PURPOSE:To prevent generation of large difference in time lag that a clutch meets after speed change between the time of heavy load and the time of light load by controlling the rise of hydraulic pressure to be added to a hydraulic clutch sharply in the middle accompanying the shift of a shifter within the range that the clutch meets. CONSTITUTION:A hydraulic controller of hydraulic clutch is equipped with a pressure regulating valve 10, which controls the hydraulic pressure acting on a hydraulic clutch 11, and a hydraulic clutch control means 5a, which controls the pressure regulating valve 10 accompanying the shift of a shifter 1 and changes the rise line of the hydraulic clutch to be applied to the hydraulic clutch 11 from 'gentle', at first, to 'sharp', from the middle, within the range that the clutch meets. By this constitution, if the shifter 1 is shifted, the hydraulic clutch control means 5a controls the pressure regulating valve 10, which strengthens the oil pressure to be applied to the hydraulic clutch 11 suddenly in the middle, though it is low at first, within the range that the clutch meets, whereby when a tractor is drawing light load, the clutch 11 meets on the first slow hydraulic rise line, and at the time of heavy load it meets at the place where the hydraulic line becomes sharp. |
