Power transmission apparatus for vehicle and vehicle-driving electric machinery system using the same

A power transmission apparatus for vehicle for transmitting power outputted from a power supply source to axles of vehicle wheels, said power transmission apparatus for vehicle comprising:

• a motor constituting said power supply source;
• a reduction gear unit for receiving and decelerating the power outputted from said motor;
• and
• a differential gear unit for receiving the torque power from said reduction gear unit and distributing the received torque power to at least two outputs, wherein:
• said reduction gear unit is a gear mechanism mechanically connected to said motor and said differential gear unit,
• said gear mechanism includes a rotary shaft over which a plurality of gears are mounted and which is arranged parallel to at least an output shaft of said motor, and
• said reduction gear unit and said differential gear unit are arranged within an area in oppositely facing relation to an axial end surface of said motor, and
• said plurality of gears are arranged inside an outer diameter of said motor.

A vehicle-driving electric machinery system for transmitting power to axles of vehicle wheels and driving a vehicle, said vehicle-driving electric machinery system comprising:

• a motor driven by a vehicle-loaded electric power supply source serving as a driving source, and generating the torque power;
• and
• a power transmission apparatus for vehicle for transmitting the power outputted from said motor to said axles,
• said power transmission apparatus for vehicle comprising:
• a reduction gear unit for receiving and decelerating the power outputted from said motor;
• and
• a differential gear unit for receiving the power from said reduction gear unit and distributing the received power to at least two outputs, wherein:
• said power transmission apparatus for vehicle is arranged within an area in oppositely facing relation to an axial end surface of said motor,
• said power transmission apparatus for vehicle is disposed in a housing together with said motor to constitute one unit,
• said axles are mechanically connected to ends of output shafts of said differential gear unit,
• said reduction gear unit is a gear mechanism including a rotary shaft over which a plurality of gears are mounted and which is arranged parallel to at least an output shaft of said motor, and
• said reduction gear unit mechanically connects said motor and said differential gear unit to each other.

A vehicle-driving electric machinery system for transmitting power to axles of vehicle wheels and driving a vehicle, said vehicle-driving electric machinery system comprising:

• a motor driven by a vehicle-loaded electric power supply source serving as a driving source, and generating the power;
• and
• a power transmission apparatus for vehicle for transmitting the power outputted from said motor to said axles,
• said power transmission apparatus for vehicle comprising:
• said motor;
• a reduction gear unit including at least two shafts parallel to an axis of said motor and decelerating the torque power outputted from said motor;
• and
• a differential gear unit for distributing the power decelerated by said reduction gear unit to left and right wheels, wherein:
• an output shaft of said motor, and a first shaft and a second shaft of said reduction gear unit each has an axis of rotation,
• when the vehicle runs forward, a tangential force is generated, in a direction perpendicular to a line connecting the output shaft axis and the first reduction gear shaft axis, at a mesh point between a gear mounted over the output shaft of said motor and a gear mounted over the first shaft of said reduction gear unit, and
• the axis of the second shaft of said reduction gear unit is arranged on a side of said line between the output shaft axis and the first reduction gear axis which is in the same direction as the direction of the tangential force.

A power transmission apparatus for vehicle comprising a motor, a reduction gear unit for decelerating power outputted from said motor, and a differential gear unit for distributing the torque power decelerated by said reduction gear unit to left and right wheels, wherein:

• said reduction gear unit is a reduction gear mechanism including a rotary shaft which is rotatably held by a housing, over which a plurality of gears are mounted in parallel and which is arranged parallel to at least an output shaft of said motor,
• said reduction gear unit and said differential gear unit are arranged within an area in oppositely facing relation to an axial end surface of said motor,
• said plurality of gears are arranged inside an outer diameter of said motor, and
• a final gear of said reduction unit is in mesh with internal teeth of an internal ring gear of said differential gear unit.

A power transmission apparatus for vehicle for transmitting power outputted from a power supply source to axles of vehicle wheels, said power transmission apparatus for vehicle comprising:

• a motor constituting said power supply source;
• a reduction gear unit for receiving and decelerating the power outputted from said motor;
• and
• a differential gear unit for receiving the torque power from said reduction gear unit and distributing the received torque power to at least two outputs, wherein:
• said reduction gear unit is a gear mechanism mechanically connected to said motor and said differential gear unit,
• said gear mechanism includes a rotary shaft over which a plurality of gears are mounted and which is arranged parallel to at least an output shaft of said motor, and
• said reduction gear unit and said differential gear unit are arranged within an area in oppositely facing relation to an axial end surface of said motor,
• said plurality of gears are arranged inside an outer diameter of said motor, and
• a final gear of said reduction unit is in mesh with internal teeth of an internal ring gear of said differential gear unit.