Abstract: A differential (10) for use with dual wheel assemblies (12) includes pinion gears (34) commonly engaged with opposing pairs of bevel gears (36, 38) but at different drive ratios in order to effect differential drive between the dual wheel assemblies, as well as between the wheels in each assembly, so that all four wheels are positively driven independently.

Abstract: An improved non-slip differential (10) includes a case (12) with a rotatable control shaft (52) and sliding control bushings (80) supporting a pair of offset bevel gears (50) which are coupled via U-joints (62) to output shafts (48). A pinion gear (64b) is set at an obtuse angle between the bevel gears (50) such that neither bevel gear and corresponding output shaft (48) can be driven to the exclusion of the other. Another pinion gear (64a) set at an acute angle relative to the bevel gears (50) is preferably included for additional load distribution between the bevel gears. A second embodiment (80) incorporates non-toothed bevels (82) and pinions (84a and 84b) in frictional engagement.

Abstract: An improved non-slip differential (10) includes a case (12) with a rotatable control shaft (52) supporting a pair of offset bevel gears (50) which are coupled via U-joints (62) to output shafts (48). A pinion gear (64b) is set at an obtuse angle between the bevel gears (50) such that neither bevel gear and corresponding output shaft (48) can be driven to the exclusion of the other. Another pinion gear (64a) set at an acute angle relative to the bevel gears (50) is preferably included for additional load distribution between the bevel gears. A second embodiment (80) incorporates non-toothed bevels (82) and pinions (84a and 84b) in frictional engagement.

Abstract: A hydraulic-controlled differential (10) includes a case (12) defining a central chamber with intermeshed control gear (52-58) different ones of which are drivingly-connected via shaft and gear arrangements (60-66, 88, 90, 94, 98 and 102) through side chambers to opposite output shafts (86). The central and opposite side chambers of the case (12) are interconnected for fluid communication via control valves (113) for controlling flow of hydraulic fluid between the chambers to effect hydraulic modulation during differential drive for more controllability. A second embodiment (150) for lighter-duty applications incorporates two control gears (152, 154).