| 摘要 |
PURPOSE:To insure the stability of running at above a fixed car speed by giving an oil pressure signal to a shift valve switchcontrolled by a solenoid valve at the fixed car speed and compensating for electrical control by mechanical control. CONSTITUTION:When the number of revolution of output shaft or car speed is above a preset fixed car speed, a governor pressure or a pressure which corresponds to the number of revolution of output shaft, is given as an oil pressure signal from a governor valve 25 to an inhibition valve 500, with the result that the valve 500 operates, and an oil pressure signal is given from the valve 500 to the third shift valve 401. The so-called second oil pressure signal acts so as to maintain the operating condition of the third shift valve 401 resulting from an oil pressure signal sent from the third solenoid valve 402. Consequently, even if the third solenoid valve 402 is switched due to any electrical disturbance or abnormality, or the oil pressure signal does not act on the third shift valve 401, the shift valve 401 maintains the previous conditions, and the speed change cannot be generated. |
