A downsized complex planetary gear unit achieving a large speed reducing ratio. A first, second, and third gear arranged coaxially while rotating relatively. A first, second, third, and fourth planetary gear are formed integrally. The planetary gears are supported by a carrier in a rotatable manner. The first planetary gear is meshed with the first gear, the second planetary gear is meshed with the second gear, the third planetary gear is meshed with the second gear, and the fourth planetary gear is meshed with the third gear. A gear ratio between the first planetary gear and the first gear is different from a gear ratio between the second planetary gear and the second gear, and a gear ratio between the third planetary gear and the second gear is different from a gear ratio between the fourth planetary gear and the third gear.

Provided is a drive source control device (67) for controlling two drive sources (2L, 2R) of a vehicle. The vehicle including the two drive sources (2L, 2R), left and right drive wheels (61L, 61R), and a power transmission device (3) disposed among the two drive sources (2L, 2R) and the drive wheels (61L, 61R). The device (3) distributes powers from the two drive sources (2L, 2R) to the wheels (61L, 61R) to drive the wheels (61L, 61R). The drive source control device (67) includes: an angular acceleration calculation (71) to calculate angular accelerations of the drive wheels (61L, 61R) and/or angular accelerations of the drive sources (2L, 2R); and a torque correction (68) to, using the angular accelerations calculated by the angular acceleration calculation (71), correct command values for respective outputs of the drive sources (2L, 2R).

Provided is a drive source control device (67) for controlling two drive sources (2L, 2R) of a vehicle. The vehicle including the two drive sources (2L, 2R), left and right drive wheels (61L, 61R), and a power transmission device (3) disposed among the two drive sources (2L, 2R) and the drive wheels (61L, 61R). The device (3) distributes powers from the two drive sources (2L, 2R) to the wheels (61L, 61R) to drive the wheels (61L, 61R). The drive source control device (67) includes: an angular acceleration calculation (71) to calculate angular accelerations of the drive wheels (61L, 61R) and/or angular accelerations of the drive sources (2L, 2R); and a torque correction (68) to, using the angular accelerations calculated by the angular acceleration calculation (71), correct command values for respective outputs of the drive sources (2L, 2R).

A differential locking mechanism is disclosed including a differential and a locking mechanism; a rotating shaft is rotatably and symmetrically provided on a shell; a gear A is fixedly provided at one end of the rotating shaft facing outside the shell; a sleeve is fixedly provided at the other end of the shell; a cylindrical gear is rotatably provided on one side of the sleeve close to a half-axle gear; one end of the cylindrical gear having teeth is meshed with the gear A, the other end is fixedly connected with a locking piece B; the locking piece B is rotatably connected to the sleeve; a locking piece C is provided opposite to the locking piece B, completing locking with the locking piece B; a connecting member D is sleeved on the sleeve and rotates together; a shifting fork is movably connected to the locking piece C.

A differential apparatus, an air purifying apparatus and an air purifier, and the differential apparatus comprises: a motor, the motor being provided with a motor shaft; an internal output shaft, the internal output shaft being connected to the motor shaft of the motor and coaxially rotating at the same speed as the motor shaft; an external output shaft, the external output shaft being connected to the internal output shaft by means of a transmission member such that the rotation speed of the internal output shaft is different from the rotation speed of the external output shaft, and the external output shaft is provided with a central hole and the external output shaft is fitted over the internal output shaft.

A differential apparatus, an air purifying apparatus and an air purifier, and the differential apparatus comprises: a motor, the motor being provided with a motor shaft; an internal output shaft, the internal output shaft being connected to the motor shaft of the motor and coaxially rotating at the same speed as the motor shaft; an external output shaft, the external output shaft being connected to the internal output shaft by means of a transmission member such that the rotation speed of the internal output shaft is different from the rotation speed of the external output shaft, and the external output shaft is provided with a central hole and the external output shaft is fitted over the internal output shaft.

A vehicle drive system configured to achieve a required driving force of braking force without changing an orientation of a vehicle in the event of slippage of a wheel. The vehicle drive system comprises: a torque generating device; a differential mechanism that allows a relative rotation between a right wheel and a left wheel; a differential restricting device that restricts a differential rotation between the right wheel and the left wheel; and a steering mechanism that controls a turning angle of pairs of the wheels. A first controller controls the relative rotation between the right wheel and the left wheel to be smaller than a predetermined value and second controller further controls a turning angle of the wheels controlled by the steering mechanism.

A collinear relationship is satisfied in which rotation speeds of first to third rotation elements and rotation speeds of fourth to sixth rotation elements are arranged respectively in this sequence on a single straight line in a collinear diagram. The first and fourth rotation elements are connected with first and second power sources respectively. The second and fifth rotation elements are connected with first and second driven units respectively. The second and sixth rotation elements are connected with each other by a first connecting mechanism in a way that rotating directions thereof are the same, and rotation speed of the former is greater than that of the later. The third and fifth rotation elements are connected with each other by a second connecting mechanism in a way that rotating directions thereof are the same, and rotation speed of the former is greater than that of the later.

A collinear relationship is satisfied in which rotation speeds of first to third rotation elements and rotation speeds of fourth to sixth rotation elements are arranged respectively in this sequence on a single straight line in a collinear diagram. The first and fourth rotation elements are connected with first and second power sources respectively. The second and fifth rotation elements are connected with first and second driven units respectively. The second and sixth rotation elements are connected with each other by a first connecting mechanism in a way that rotating directions thereof are the same, and rotation speed of the former is greater than that of the later. The third and fifth rotation elements are connected with each other by a second connecting mechanism in a way that rotating directions thereof are the same, and rotation speed of the former is greater than that of the later.

A power transmission device include: a differential having three rotational elements; and a connection switching device that selectively switches a connection relationship among an input shaft, a first output shaft, a second output shaft, and the three rotational elements. Further, the connection switching device selectively fixes any one rotational element to a fixing member, the second power source is coupled to rotational elements other than the rotational element fixed to the fixing member, the differential can be switched between modes including a first mode where any one rotational element among the three rotational elements is coupled to the input shaft, one of the remaining rotational elements is fixed to the fixing member, and the other is coupled to the first output shaft, and a second mode where the three rotational elements are respectively coupled to the second power source, the first output shaft, and the second output shaft.