| 摘要 |
1,072,097. Motor vehicle transmission gearing. INTERNATIONAL HARVESTER CO. Sept. 10, 1964 [Sept. 23, 1963], No. 37029/64. Heading B7H. [Also in Division F2] Each driving wheel 17 of a combine harvester is driven through separate transmission means comprising a mechanical change-speed gear 19 which includes variable-ratio gear trains mounted on an array of shafts disposed partly within the figure of rotation defined by the wheel and is driven by an individual hydraulic motor 22 supplied from an enginedriven pump. A single control lever acts through linkage 21 to effect simultaneous ratio selection in the change-speed gears 19. The hydraulic motors 22 are connected by reversible flow and return lines (23, 24 and 25, 26, in Fig. 7, not shown), to a manual control valve (27) providing for differential control of motor speed and direction to assist in steering the vehicle. The valve is supplied from a pump (29) driven from the engine (18), and fluid returns to the pump through an eductor (31) supplying make-up fluid from a reservoir. Conduits (39) discharge leakage from the motors 22 to the reservoir. Gauges (35, 37) indicate the reservoir temperature and pump output pressure. Each change-speed gear 19 includes a gear (79 in Fig. 3, not shown), which is mounted on the shaft of the wheel 17 and is driven through gears (78, 73) and a shaft (75) provided with a twin disc brake (153) from a gear (70) on a spindle (69). The output shaft (48) of the hydraulic motor 22 drives a shaft (50) carrying a pinion (56) meshing with a gear (57) carrying a gear cluster (62) slidable from a neutral position to engage a pinion (62a) with the gear (67) in first gear, or to engage with splines (65a) on a pinion (65) meshing with the gear (70) in second gear. In third gear a pinion (53) on the shaft (50) is engaged with the pinion (65). Selector forks (55, 66) on sliding shafts (93, 106, in Fig. 4, not shown), positioned by detents (99, 111) and prevented from moving simultaneously by interlock detents (116, 117) are separately controlled by first moving the control lever (152, in Fig. 8, not shown) laterally into engagement with a recess in one of bellcranks 145, 145a before pivoting the lever to actuate one set of parallel elements 143, 140, 122 and 143a, 140a, 122a in the linkage 21.
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