In a left-right wheel drive device (10) that accommodates, in a casing (4), two electric motors (1, 2) spaced apart from each other and a planetary gear mechanism (3) arranged so as to be offset on a first side in an axial direction, a pair of motor shafts (11), a pair of counter shafts (12), and two output shafts (13, 14) are arranged in parallel. The first output shaft (13) is arranged on the first side from the planetary gear mechanism (3) and is fixed with a carrier (3C) at an end portion of a second side thereof. The second output shaft (14) is longer than the first output shaft (13) and is fixed with the second sun gear (3S2) at an end portion on the first side thereof. The second output shaft (14) is rotatably supported by roller bearings (35, 36) at the end portion on the second side and a position on the second side from a driven gear meshing with the second counter gear.

In a left-right wheel drive device (10) that accommodates, in a casing (4), two electric motors (1, 2) spaced apart from each other and a planetary gear mechanism (3) arranged so as to be offset on a first side in an axial direction, a pair of motor shafts (11), a pair of counter shafts (12), and two output shafts (13, 14) are arranged in parallel. The first output shaft (13) is arranged on the first side from the planetary gear mechanism (3) and is fixed with a carrier (3C) at an end portion of a second side thereof. The second output shaft (14) is longer than the first output shaft (13) and is fixed with the second sun gear (3S2) at an end portion on the first side thereof. The second output shaft (14) is rotatably supported by roller bearings (35, 36) at the end portion on the second side and a position on the second side from a driven gear meshing with the second counter gear.

Mechanical interconnection of multiple rotatable devices that includes: a gear train, at least three rotatable devices, one or more first stages, and one or more second stages, a first element, i.e. a geared element or a planet carrier, of one of the second stages forming a torque resisting means being blocked or impeded in a controllable way. The third rotatable device interacting with a second element, i.e. a gearwheel, or a planet carrier, of one of the second stages.