| 摘要 |
1,037,406. Hydrostatic transmissions. S.A. ANDRE CITROEN. March 29, 1963 [June 29, 1962], No. 12528/63. Headings F2C and F2D. A hydrostatic transmission for a vehicle comprises a swash plate pump 1 supplying one or more motors 5, the swash plate 6 being controlled by the liquid delivered by a centrifugally regulated engine-driven pump 9 through a valve 34 and piston-cylinder unit 24. The delivery line 81 of pump 9 is connected directly to the unit 24 through a line 30 and indirectly, through the valve 34, by lines 32, 38, the line 38, and line 30 also if desired, having an adjustable throttle 39 coupled to the swash plate 6. The end of valve 34 is subjected to the pressure from pump 9 through a line 21, balanced by a spring 41 whose loading is varied by a screwed spindle 42 connected to a lever 43 operated by the accelerator pedal 44. A further pistoncylinder unit 53, 54 is connected to the throttle lever 51 and to a valve 69 which, under cold starting conditions may be displaced by a spring 73 compressible by a hand lever 76 to short-circuit the pump and motor liquid supply passages 3, 4 through lines 66, 67. The supply passages also incorporate a forward and reverse selector valve 7. To prevent reverse flow in the passages 3, 4 when coasting an axial valve 84 is associated with a calibrated pressure regulating valve 84, the flow from which is fed by a line 95 to parts of the system requiring cooling or lubricating. The engine ignition timing may be varied by a pistoncylinder unit 64, 65 in a line 21 branching from the pump 9. |
