| 摘要 |
<p>1,149,986. Change speed control; valves. FORD MOTOR CO. Ltd. 21 Aug., 1967 [12 Oct., 1966], No. 38425/67. Headings F2D and F2V. A governor for providing a fluid pressure signal responsive to the speed of rotation of a shaft 12 and suitable for controlling ratio establishing clutches and brakes in an automatically controlled motor vehicle change speed gear comprises a casing 96 fast with the shaft 12 and having diametrically opposed radial bores 104, 106 respectively containing a primary governor valve 102 and a secondary feedback valve 100. Pressure liquid is continuously fed from an engine driven pump through ducts 92, 120 to a chamber 116 of the governor valve 102. When the valve 102 is urged outwardly by centrifugal force pressure fluid flows from the chamber 116 to a chamber 118 where it acts on differential lands 110, 112 of the governor valve to balance centrifugal force. The governed pressure in the chamber 118 is supplied through ducts 126, 94 to the governed apparatus and to a chamber 144 of the secondary feedback valve 100. At low speeds a spring 132 holds the valve 100 radially inward to block communication between the chamber 144 and a feedback duct 136 which is vented at 142. When the speed of the shaft 12 exceeds a predetermined value the valve 100 moves outwardly under centrifugal force and the governed pressure is fed back from the chamber 144 through duct 136 to the end of the governor valve 102 which is thus additionally loaded to modify its regulating characteristic. An exhaust port 114 exhausts the chamber 118 when the valve 102 moves radially inward. Fig. 3 (not shown) is a graph of speed against governor pressure.</p> |
