Transfer unit for a motor vehicle

A transfer comprising:

• an input shaft that inputs power from a first power source;
• a motor that functions as a second power source;
• a first output shaft that transmits power to main drive wheels;
• a second output shaft that transmits power to auxiliary drive wheels;
• a first planetary gear device having a first rotational element coupled to the motor, a second rotational element, and a third rotational element;
• a second planetary gear device having a fourth rotational element coupled to the second rotational element, a fifth rotational element, and a sixth rotational element;
• an input switching unit that selectively switches a connection destination of the input shaft;
• the input switching unit that switches a speed-changing state in which a rotation of the first rotational element is output with a speed thereof being changed by the first planetary gear device, and a non-speed-changing state in which a rotation of the first rotational element is output with a speed thereof not being changed by the first planetary gear device;
• and
• a distribution switching unit that switches a distribution state in which power is transmitted to the first output shaft and the second output shaft, and a non-distribution state in which power is transmitted only to the first output shaft between the first output shaft and the second output shaft, wherein
• connection states of the input shaft, the first planetary gear device, the second planetary gear device, the first output shaft, and the second output shaft can be switched to a plurality of modes by the input switching unit, the transmission switching unit, and the distribution switching unit, and
• the plurality of modes includes
• a first mode in which the input shaft is in a state of being directly coupled to the first output shaft and the distribution switching unit is in the non-distribution state,
• a second mode in which the input shaft is in a state of being directly coupled to the first output shaft, the distribution switching unit is in the distribution state, and the three rotational elements in the second planetary gear device can make differential motions in a state of being respectively coupled to the motor, the first output shaft, and the second output shaft, and
• a third mode in which the input shaft is in a state of being coupled to the first rotational element of the first planetary gear device, the distribution switching unit is in the distribution state, the transmission switching unit is in the speed-changing state in which the third rotational elements are fixed to a fixing member, and the three rotational elements are integrally rotatable in the second planetary gear device in a state in which two rotational elements are coupled to each other and any one of the rotational elements is coupled to the first output shaft.