| 摘要 |
1,133,393. Change speed control. EATON AXLES Ltd. 24 Feb., 1966 [3 March, 1965], No. 8295/66. Heading F2D. In a two-speed axle wherein shift of a toothed gear establishing torque-transmitting sleeve (13) is effected on reduction of transmitted torque, the sleeve (13) is axially shifted by a piston 50 which is movable in a cylinder 65, is held in Low gear position by a spring 67 and is acted on for upshift to High gear position, against the spring 67, by pneumatic pressure admitted to the cylinder above the piston, and the rod 51 of the piston is preferably square-sectioned, is encircled closely by the spring 67, and is connected to the sleeve (13) by a bell-crank lever 43 and a lever (21) (Figs. 1, 2, not shown). As shown a rolling, flexible diaphragm-type seal 60, between two cups 53 (59) forming the piston, is clamped between cylinder portions 61, 62. The piston movement is stabilized by nylon rings 71, 72. At least one vent port 70 is provided below the piston. A bumper 80 defines the High gear position of the piston. The piston-rod is guided in a supporting casing 33 by a nylon bush 77 having a flange portion 77b supporting the spring. Ports 59c in the upper piston cup (59) permit air pressure application to the rolling seal to facilitate movement thereof. The piston-rod 51 is connected to the bell-crank lever 43 by a clevis pin 52 of the pistonrod engaging a slot 45a in the bell-crank lever. In an alternative embodiment, Fig. 6 (not shown), the piston comprises a single cup into which the piston-rod is screwed, the pistonseal comprises an O-ring which is flanked by felt rings, and the guide bush 77 is omitted, the slot 45a in the bell-crank lever 43 being replaced by a circular opening. |
