A four-wheel driving apparatus for a vehicle may include a planetary gear set including a sun gear, a carrier, and a ring gear, and provided so that the sun gear is coupled to a transmission output shaft; a counter shaft provided in parallel to the transmission output shaft; a sleeve included in the counter shaft, receiving operating force of a shift fork to slide along a longitudinal direction of the counter shaft, and provided to be selectively coupled to any one of the sun gear and the carrier of the planetary gear set according to a sliding position; a center differential connected to a front differential through a front output shaft and connected to a rear differential through a rear output shaft; and a transfer gear device disposed to connect between the counter shaft and any one of the front output shaft and the rear output shaft.

A cycloidal differential includes a driven body, first and second cycloidal drives, and a coupling plate. The first cycloidal drive is disposed on a first side of the driven body and has a first input member rotationally fixed to the driven body and a first output member configured to connect with a first half shaft. The second cycloidal drive is disposed on a second side of the driven body and has a second input member rotationally fixed to the driven body and a second output member configured to connect with a second half shaft. The coupling plate is supported for rotation within the driven body and is connected to each of the first and second cycloidal drives.

A cycloidal differential includes a driven body, first and second cycloidal drives, and a coupling plate. The first cycloidal drive is disposed on a first side of the driven body and has a first input member rotationally fixed to the driven body and a first output member configured to connect with a first half shaft. The second cycloidal drive is disposed on a second side of the driven body and has a second input member rotationally fixed to the driven body and a second output member configured to connect with a second half shaft. The coupling plate is supported for rotation within the driven body and is connected to each of the first and second cycloidal drives.

A cycloidal differential includes a driven body and a coupling ring supported for rotation within the driven body. The coupling ring defines a first eccentric race and a second eccentric race on opposing sides of the coupling ring. The cycloidal differential further includes first and second cycloidal drives. The first cycloidal drive includes a first roller disk received in the first eccentric race and a first output member operably coupled to the first roller disk and configured to couple with a half shaft. The second cycloidal drive includes a second roller disk received in the second eccentric race and a second output member operably coupled to the second roller disk and configured to couple with another half shaft.

A cycloidal differential includes a driven body and a coupling ring supported for rotation within the driven body. The coupling ring defines a first eccentric race and a second eccentric race on opposing sides of the coupling ring. The cycloidal differential further includes first and second cycloidal drives. The first cycloidal drive includes a first roller disk received in the first eccentric race and a first output member operably coupled to the first roller disk and configured to couple with a half shaft. The second cycloidal drive includes a second roller disk received in the second eccentric race and a second output member operably coupled to the second roller disk and configured to couple with another half shaft.

A differential apparatus includes a differential device, and a differential restricting portion configured to restrict a differential operation of the differential device. The differential device includes a differential case which is rotatably disposed, a differential gear which is rotatable while being supported by the differential case and revolves by rotation of the differential case, and a pair of output gears which are meshed with the differential gear and are rotatable relative to each other. The output gears include a gear member provided with a gear portion, and an output member including an output portion configured to output a driving force inputted to the output gears. A cam portion is provided between the gear member and the output member. The differential restricting portion is provided between the differential case and the output member.

Technologies relating to two channel transmissions are disclosed. A two channel transmission may comprise a differential or epicyclic gear train disposed inside a case, with input/output shafts extending out of case. A speed variator may link inputs and outputs of the differential or epicyclic gear train. The speed variator may comprise, inter alia, a continuously variable transmission (CVT) and a speed range gear. The CVT may link to an input/output shaft outside the case, and the speed range gear may link to an input/output shaft or carrier gear inside the case. In high-stability embodiments, the speed variator may be replaced by a belt or a set of gears.

A cycloidal differential includes a driven body and a first cycloidal drive having a first input member rotationally fixed to the body and a first output member configured to connect with a first half shaft. The differential further includes a second cycloidal drive having a second input member rotationally fixed to the body and a second output member configured to connect with a second half shaft. An eccentric shaft, of the differential, extends through the driven body and is connected between the first and second cycloidal drives.

A cycloidal differential includes a driven body and a first cycloidal drive having a first input member rotationally fixed to the body and a first output member configured to connect with a first half shaft. The differential further includes a second cycloidal drive having a second input member rotationally fixed to the body and a second output member configured to connect with a second half shaft. An eccentric shaft, of the differential, extends through the driven body and is connected between the first and second cycloidal drives.

A cycloidal differential includes a driven body and a coupling ring supported for rotation within the driven body. The coupling ring defines a first eccentric race and a second eccentric race on opposing sides of the coupling ring. The cycloidal differential further includes first and second cycloidal drives. The first cycloidal drive includes a first roller disk received in the first eccentric race and a first output member operably coupled to the first roller disk and configured to couple with a half shaft. The second cycloidal drive includes a second roller disk received in the second eccentric race and a second output member operably coupled to the second roller disk and configured to couple with another half shaft.