| 摘要 |
<p>1,036,393. Valves. FORD MOTOR CO. Ltd. Feb. 5, 1965 [March 23, 1964], No. 5036/65. Heading F2V. [Also in Division G3] In a motor vehicle automatic transmission, a regulator valve 20 produces a high pressure signal by the action of the signal on a differential area of a valve member 26 opposing the action of a spring 40 and a low pressure signal when a device 68 responsive to the speed of a shaft causes a fluid pressure to oppose the spring. The device 68 comprises a centrifugal governor driven by toothed gearing from the output shaft 10 of a transmission and displaces a valve 44 to the right with increasing speed until ports 46 in the valve connect a bore 54 in the valve 26 with an exhaust port 48 in the valve housing. Pressure from an inlet pipe 34 acting on the right-hand end of the valve 26 is thus relieved so that the spring 40 displaces the valve 26 to the right to restrict communication between a regulated pressure outlet 32 and an exhaust port 38 and to increase communication with the inlet 34, the pressure increase in the outlet 32 causing the first gear shift. Further increase in speed causes the valve 44 to engage a shoulder 58 on the valve 26 so that the latter is directly actuated by the governor and causes a further increase in pressure initiating a second gear shift. The regulated pressure acting on the difference in area between lands 28 and 30 opposes opening movement of the valve 26. A gear 14 co-operates with a pawl on a parking brake.</p> |
