UEberlagerungslenkgetriebe fuer Gleiskettenfahrzeuge

摘要

1,155,867. Differential steering. ZAHNRADERFABRIK RENK A.G. 5 Sept., 1966 [8 Sept., 1965], No. 39631/66. Heading B7H. In a superposed steering gear for an endless track vehicle with track drive sprockets 5, 51 driven through epicyclic gears 4, 41, a differential steering shaft 8, 81 is connected to a hydrostatic gear 6, an additional steering gear 9, the torque of which is added to that of the hydrostatic gear, being connected to the epicyclic gears 4, 41. The additional steering gear 9 preferably includes variable slipping clutches which may be hydrodynamic, 10, 101, and act on the steering shaft 8, 81 (Fig. 1) or be friction clutches (18), (181) acting on the epicyclic gears 4, 41 (Fig. 2, not shown). The engine 1 drives the variable slipping clutches through spur gearing, the hydrostatic gear 6 and a change speed gearbox 3, which drives the sprockets 5, 51 through the epicyclic gears 4, 41. Movement of a control lever 11 connected to a steering-wheel actuates the hydrostatic gear 6 to rotate the shaft portions 8, 81 differentially and also controls through an hydraulic valve 13, the degree of filling one or other of the two hydrodynamic clutches 10, 101, thereby increasing the torque applied to the steering shaft 8, 81. In Fig. 2, the hydraulic valve 13 controls the alternative engagement of the friction clutches (18), (181).