Patent GB-1013601-A (GB)
Title: Improvements in or relating to a motor vehicle
IPC: B60K17/10
Filed: 1961-12-08
Abstract: 1,013,601. Controlling vehicles. C. VAN DER LELY N.V. Dec. 8, 1961 [Dec. 9, 1960], No. 44033/61. Heading B7H. [Also in Divisions F1 and F2] A tractor has an hydraulic transmission comprising a swashplate motor/pump unit, the speed of the tractor being controlled either by varying the swashplate angle or by varying the engine speed. The control arrangement comprises a lever 219, Fig. 4, pivotally mounted in a member 221 for movement in a slot 321, the member 221 being carried by a rod 222 rotatably mounted in a bearing 223 so that the lever 219 can move in a slot 320, the rotary movement of rod 222 controlling the swashplate angle. The lever 219 carries a follower 225 which coacts with a pair of cams 230 and 229 when the lever 219 moves in the slot 321, the cam 229 having a greater face angle and therefore operating before the cam 230. The cams 230 and 229 being connected respectively to rods 227 and 228, the latter bearing upon a surface 275 of a bell-crank lever 277, the other arm of which is connected to an axially slidable rod 284 and may make contact with a lever 287 fixed to a rod 288 to which is also fixed a lever 306 which bears against an operating member 307, 308 of a device 309 which controls the engine speed. An operating lever 301 is connected through a cable 298 to a lever 290 fixed to a sleeve 291 freely rotatable upon the rod 288 and which has a spring-loaded arm 293 which bears against the lever 287. Thus the speed controller 309 may be actuated by turning the lever 301 through the cable 298, the lever 290 causing the member 293 to bear against the lever 287 and rotate the rod 288 whereby the lever 306 depresses the actuating member 307. When the lever 301 is returned to its first end position, the apparatus is restored to its former condition by a spring 311. When it is desired to drop the engine speed with the lever 305 in a running position, the lever 219 is moved along the slot 321, first depressing the cam 229 and then the cam 230, thereby causing the rod 284 to press against the lever 287 and rotate the rod 288 with the member 293 compressing the spring 297. An overriding speed control (for use, e.g., with the power take-off) comprises a lever 316 connected by a link 315 to a lever 312 which bears against the operating member 307. The tractor wheels are connected to a brake drum 252, Fig. 5, with which co-operates a band 251 urged to the operative position by a spring 254. The brake may be held in the disengaged position by a lever 262 or, in the normal running condition, by the application of a fluid pressure upon a piston 245 through a duct 242 under the control of a valve 235, Fig. 6 having a fluid supply connection 241 and exhaust 243. When the handle 219 is moved along the slot 321, the initial movement operates the cam 229 connected by a rod 227 to the valve member 240 whereby the fluid connection between the supply 241 and duct 242 is interrupted and the duct 242 is connected to the exhaust 243, whereby the brake is applied through the spring 254. The rod 228 may also be connected to a valve which shortcircuits the pressure fluid to reservoir in the hydraulic pump/motor transmission.