Differential gear

A differential gear having an input side rotary member for receiving an external driving force, first and second output side rotary members for respectively driving a left driving wheel and a right driving wheel and arranged coaxially with a rotational axis of the input side rotary member, and a gear body for supporting the input side rotary member and the output side rotary members in a freely rolling manner, with a rotational force of the input side rotary member being transmitted to the output side rotary members while permitting a difference in speed of rotation between the output side rotary members, said differential gear comprising:

• a first input side gear disposed on said input side rotary member at one end side thereof in an axial direction, said first input side gear jointly rotatable with said input side rotary member;
• a second input side gear disposed on said input side rotary member at another end side thereof in an axial direction, said second input side gear jointly rotatable with said input side rotary member;
• a first output side gear having a different deceleration ratio relative to said first input side gear, said first output side gear jointly rotatable with one of said output side rotary members;
• a second output side gear having a different deceleration ratio relative to said second input side gear, said second output side gear jointly rotatable with the other of said output side rotary members;
• at least one first planetary gear meshing with said first input side gear and said first output side gear;
• at least one second planetary gear meshing with said second input side gear and said second output side gear;
• a first support member for supporting said first planetary gear to be able to rotate on an axis thereof and to revolve around the rotational axis of said input side rotary member;
• a second support member for supporting said second planetary gear to be able to rotate on an own axis thereof and to revolve around the rotational axis of said input side rotary member;
• first rotation controlling means for controlling with an arbitrary controlling force a rotation of said first support member around the rotational axis of said input side rotary member;
• and
• second rotation controlling means for controlling with an arbitrary controlling force the rotation of said second support member around the rotational axis of said input side rotary member;
• and
• wherein said rotation controlling means includes a first plurality of friction plates rotating jointly with one of said first support member and said second support member, a second plurality of friction plates simply supported on said gear body, and pressing means for pressing the first plurality of friction plate and the second plurality of friction plates together arbitrary pressing force, and
• wherein said first planetary gear and a second planetary gear each includes a first gear and a second gear.