| 摘要 |
1,090,506. Change Speed control. FORD MOTOR CO. Ltd. May 6, 1966 [June 9, 1965], No. 20117/66. Heading F2D. The engaging pressure 196 supplied through a manual selector valve 124 to liquid pressure operated friction clutches and brakes 74, 102, 34, 52 of a planetary change-speed gear is varied in response to accelerator pedal position during starting by a valve 118 which blocks the supply of engaging pressure at closed throttle and is by-passed by a governor valve 12 above a predetermined vehicle speed. Gear arrangement.-The planet gear comprises two sun-ring planet trains 30, 32 having a common sun 40. The carrier 36 of the first train and ring gear 44 of the second train are fast with an output shaft 42. For low ratio the ring gear 34 is clutched at 102 to an input shaft 20 and the carrier 48 of the second train is held by a brake 52 to compound both trains. For second ratio the brake 52 is released and the sun gear 40 is held by a brake 84. During 1-2 upshift the brake 52 is released prior to engagement of the brake 84 and the carrier 48 reacts on a one-way brake 66. Direct drive is provided by engaging a clutch 74 in addition to the clutch 102 and thus connecting both the sun 40 and ring 34 of the train 30 to the input shaft. For reverse the sun 40 is clutched at 74 to the input shaft 20 and the carrier 48 is held by the brake 52. Fluid pressure system.-A main pressure regulator valve 116 is fed by an engine-driven pump 28 and supplies pressure liquid to a governor valve 120 at a pressure which varies in accordance with manifold depression 146. Below a predetermined vehicle speed the governor valve 120 directs the pressure liquid to the starting valve 118. The accelerator acts through a lever 194 on the loading spring 190 of the valve 118 so that as the accelerator is depressed the valve 118 closes an exhaust port 186 and progressively connects the servo line 196 to the line 162 from the governor valve. Servo pressure acts between differential lands 180, 182 to oppose the force of the loading spring and in forward ratios also acts on the end of the valve spool 118. Above a predetermined vehicle speed the governor valve 120 is moved left by pressure liquid supplied from an output driven governor 114 to cut put the starting valve 118 and connect the main regulator valve output 148 directly to the servo supply line 196. The manual selector valve 124 selectively connects the line 196 to lines 60, 92, 94, 110 supplying the clutch and brake servos. |
