To provide a vehicle driving unit incorporated with a compact speed reduction mechanism providing a high speed reduction ratio.
The vehicle driving unit 20 is provided with a motor 21 carrying out rotary driving of a motor side rotation member 30, the speed reduction mechanism 31 reducing rotation of the motor side rotation member 30 and transmitting it to a wheel side rotation member 38, and a differential gear mechanism 41 distributing rotation of the wheel side rotation member 38 to left and right drive shafts 15a, 15b. The speed reduction mechanism 31 is provided with a speed reduction gear rotary shaft 32 having eccentric parts 32a, 32b, curved plates 33, 34 used as revolving members rotatably held by the eccentric parts 32a, 32b, a plurality of outer pins 35 used as outer circumferential engagement members held in fixed positions on a casing, and engaging with outer circumference parts of the curved plates 33, 34, and a motion converting mechanism transmitting rotating motions of the curved plates 33, 34 to the wheel side rotation member 38.
COPYRIGHT: (C)2007,JPO&INPIT
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Morishita Hachiro
Hiroyuki Yoshida