| 摘要 |
PURPOSE:To reduce creation of abnormal gear noise at the low speed range of an engine, by a method wherein oil pressure, fed by a hydraulic pump driven by the engine, is converted into a pulse state to apply it to the hydraulic cylinder of a hydraulic clutch. CONSTITUTION:Oil pressure, fed from an oil pan 6 by a hydraulic pump 1 driven by a main engine, is regulated into constant pressure by a pressure regulating valve 2 mounted in an oil pressure feed passage 7. Thereafter, the oil pressure is applied in a pulse state to the hydraulic cylinder 4 of a hydraulic clutch through operation of a servo valve 3 provided in the oil pressure feed passage 7 to control the biasing force of the hydraulic clutch. The servo valve 3 is controlled by means of an electric signal 5, and in which case, the number N of revolutions of an output shaft may be controlled through variation of a frequency (f) and a duty ratio T1/T0 of the electric signal 5. |
