| 摘要 |
918,833. Change speed control. GENERAL MOTORS CORPORATION. Oct. 18, 1961 [Nov. 3, 1960], No. 37383/61. Class 80 (2). In a power unit comprising a gas turbine driving through a stepped ratio automatic change speed gear, gear shift is controlled in accordance with the compressor outlet pressure. A gas turbine 701 has a compressor 702 and drives an output shaft 728 of a vehicle transmission through a reduction gear 721 and a twospeed epicyclic gear 724. The two speeds are obtained by holding the ring gear 729, and by clutching the ring gear to the run shaft 722, by hydraulic motors 732, 736 respectively. Oil, for the operation of the motors, is supplied by a pump 743 through a pressure regulating valve 746, responsive to the compressor outlet pressure, to a shift valve 806 loaded at one end by pressure from an output shaft driven governor and at the other in accordance with compressor outlet pressure. A throttle valve 768 regulates oil pressure from line 744 to line 786, loading the regulator valve 746 and shift valve 806, in accordance with compressor pressure at 766. Under normal conditions this pressure in line 767 acts together with a spring 773 to load the valve 769 and supply proportional pressure to the valves 746 and 806 through line 786, speed changes being made according to output shaft speed against compressor pressure. On kickdown of throttle pedal 796, compressor pressure from line 803 is fed to line 801 and acts on a larger area land 776 of the throttle valve to produce increased pressure in line 786 and enforce downshift by valve 806. |
