| 摘要 |
1,095,725. Clutch control. SOC. ANON. ANDRE CITROEN. Feb. 23, 1965 [Feb. 28, 1964], No. 7845/65. Heading F2L. An hydraulic circuit for simultaneous control of the friction main clutch and the engine throttle of a motor vehicle giving rapid initial engagement and gradual final engagement of the hydraulically disengaged clutch, the change point from rapid to gradual movement being determined by the engine throttle position, comprises, between a manually or automatically actuated gear ratio selection and clutch control valve 3 and a clutch disengaging jack 8, a device 1 having valve spools 6, 7 urged leftwards in a bore 48 by a spring 37 and the fluid pressure existing in the jack 8 and rightwards by a spring 27, acting through a lever 28, the tension of which spring 27 is controlled by the angular position of the engine throttle spindle 21 by means of a cam 22 and a lever 25. Movement of the valve 3 to a clutch disengaged position admits fluid pressure through a line 2, ports 43, 44, a chamber 35, and a line 46 to the clutch jack 8, and through a line 20 to a cylinder 15 where it acts to move a piston 16 leftwards against a spring 17 to act on the cam 22 to limit the engine throttle opening to e.g. 2/3 maximum, a sleeve 19 limiting the travel of the piston 16. The line 20 may include a one-way restrictor (Fig. 4, not shown) to prevent rapid throttle closure. Fluid pressure in the chamber 35 moves the spools 6, 7 leftwards to fully open the port 43 to the bore 48. The distance between the lands of the spools 6, 7 is slightly less than the distance between the ports 43, 44. When, for clutch engagement, the line 2 is exhausted by the valve 3 to a reservoir, the fluid from the clutch jack 8 passes rapidly through the port 43 until the jack pressure is overcome by the action of the spring 27 and the spools move rightwards to close the port 43. The remaining pressure is then released more slowly by leakage at a predetermined rate round the spool 7 from the port 44. The spring 17 returns the piston 16 to release the throttle. The tension of the spring 27 is adjustable by a screw adjusted opposing spring 30. |
