Abstract:
A driving apparatus (2) for speed changing and steering of a vehicle consists of a first driving unit (21) for speed changing in advancing and reversing and a second driving unit (22) for steering, which are arranged in a longitudinal row and are attached to a vehicle chassis (12). Each of the first driving unit (21) and the second driving unit (22) has a common structure, which comprises a housing and an HST and left and right differential output shafts contained in the housing. A left first differential output shaft (40L) and a left second differential output shaft (44L) are connected with each other so as to be rotated in the same direction, and a right first differential output shaft (40R) and a right second differential output shaft (44R) are connected with each other so as to be rotated in opposite directions. Both first and second HSTs of the first driving unit (21) and a second driving unit (22) receives power from engine (11) through a common single belt (30). A movable swash plate (57) of a hydraulic pump (51) of the first HST is connected to a speed change pedal (15) and a movable swash plate (76) of a hydraulic pump (71) of the second HST is connected to a steering wheel (14).
Abstract:
The invention relates to a drive for a vehicle with running gears rolling on a base, especially caterpillar tracks (8a, 8b). The drive is provided via a motor (1), a gearbox (3) driven thereby and summarizing gear (6) to drive the vehicle. A summarizing gear (6) is allocated to the right and left running gear (8a, 8b) respectively. A rotation speed in the summarizing gear (6) is superimposed by a supplementary drive (4) on the drive speed transmitted to the running gear (8a, 8b) by the gearbox (3). There is both equal same-direction speed superimposition and equal opposite-direction speed superimposition dependant on the turning radius. The supplementary drives (4) each have a hydrostatic drive with a pump (4a) which can be steplessly adjusted through zero to reverse the direction of rotation, via which a hydraulic motor (4d) is actuated. This arrangement facilitates both the adjustment of the travelling speed to make better use of the engine power for the work involved and steering via the running gear (8a, 8b). Since only a small proportion of the power need be applied via the supplementary drives (4), better efficiency is achieved.
Abstract:
A superimposed steering gear (3) for tracklaying vehicles superimposes the steering power required to steer the vehicle in curves on the vehicle drive system by means of summarizing differentials, and comprises a summarized hydrostatic-mechanical power branch in a summarizing gear (31). In order to minimize power losses due to inefficiency of the hydrostatic branch and to permit continuous steering in all radial regions, the summarizing gear (31) can be changed in at least two steps corresponding to two radial regions. The rotational speed of the components of the gear is adapted to each gear change point, thereby ensuring continuous transition.
Abstract:
Continuously driven vehicle steering differentials have heretofore been too complex and have undesirably incorporated a second cross shaft for counter-rotating a pair of oppositely located planetary elements. The planetary steering differential (10) overcomes these deficiencies by including first, second and third interconnected planetary mechanisms (12, 14, 16) for rotating a pair of output members (48, 52) in the same direction and at the same speed in response to rotation solely of a first input member (57) and holding a second input member (63) stationary, and for rotating the output members (48, 52) in opposite directions at the same speed in response to rotation solely of the second input member (63) and holding the first input member (57) stationary. The first input member (57) is driven by a transmission (58), and the second output member (63) is driven by a reversible steering motor (66).
Abstract:
A compact steering system with a differential mechanism, suitable for a track-laying vehicle on which the engine is mounted sideways, is provided. The steering system for track-laying vehicles having an input shaft (11) connected to an output shaft (3a) of a transmission and output shafts (20a, 20b) for transmitting power respectively to driving wheels (6a, 6b) of right and left caterpillar bands in order to enable the track-laying vehicle to turn by changing speed of one of the output shafts (20a, 20b) by a hydraulic motor (40) is characterized in that the input shaft (11) is inserted through a hollow shaft (25) on which each sun gear (13, 18, 26) of first, second and third planetary gear mechanisms (37, 38, 39) is fixedly installed, and an end of the input shaft (11) is connected to a planetary carrier (12) of the first planetary gear mechanism (37), and a ring gear (19) of the second planetary gear mechanism (38) is connected to the hydraulic motor (40), and a planetary carrier (16a) of the second planetary gear mechanism (38) is connected to a ring gear (15) of the first planetary gear mechanism (37) and one output shaft (20b), and a ring gear (30) of the third planetary gear mechanism (39) is fixed on a case (35), and a planetary carrier (28) of the third planetary gear mechanism (39) is connected to the other output shaft (20a).
Abstract:
A hydraulic and mechanical composite transmission (40), wherein a mechanical speed change mechanism (30) having a differential part (7) comprising a group of planetary gears and a hydraulic continuously variable transmission mechanism (21) are provided between a speed change input part receiving a power from a prime mover and speed change output parts (27, 28), the rotation of the speed change input part is input to a pump shaft (25a) of the hydraulic continuously variable transmission mechanism (21) and the first differential input part (25b) of the differential part, a second differential input part to which the rotation of the motor shaft (26) of the hydraulic continuously variable transmission mechanism (21) is input is provided further on the differential part (7) so that the rotation of the group of planetary gears produced by a difference in rotation between two differential input parts at the differential part (7) can be transmitted to the speed change output part (27), the speed change input part being formed at one end of the pump shaft (25a), the first differential input part (25b) being formed at the other end, and a shaft as the first differential input part (25b) being extended and connected to a PTO shaft (42).
Abstract:
Hydraulic drive for a skid steer loader wherein the power plant (12) drives a continuously variable output pump (13) whose output is coupled by control valves (17) to hydraulic drive motors with speed control achieved by adjusting the pump output (13) and steering achieved by setting of the control valves (17).
Abstract:
A tracked ATV includes a frame, a track coupled to the frame, and a power source supported by the frame and drivingly coupled to the track. The tracked ATV further includes a steering and drive assembly, which has a first hydraulic pump coupled to the tracks for large radius turns. The steering and drive assembly also has a second hydraulic pump coupled to the tracks for small radius turns.