Support structure and gear mechanism having the same

A gear mechanism:

• a change-direction gear set to change a rotation direction of a driving force at a right angle, the change-direction gear set comprising a first change-direction gear and a second change-direction gear;
• an input shaft rotating coaxially and integrally with the second change-direction gear;
• an output shaft disposed in parallel with the input shaft;
• a power transmission device coupling the input shaft with the output shaft;
• a housing member housing the input shaft, the output shaft and the power transmission device;
• a pair of first bearings aligned in an axial direction, the first bearings rotatably supporting the input shaft with respect to the housing member;
• a pair of second bearings aligned in an axial direction, the second bearings rotatably supporting the output shaft with respect to the housing member;
• and
• a pair of third bearings rotatably supporting the first change-direction gear with respect to the housing member, wherein the power transmission device is disposed between the pair of the first bearings, and
• at least any one pair of the first bearings and the second bearings are disposed in the vicinity of the second change-direction gear.

A gear mechanism comprising:

• a change-direction gear set to change a rotation direction of a driving force at a right angle, the change-direction gear set comprising a first change-direction gear and a second change-direction gear;
• a first gear rotating coaxially and integrally with the second change-direction gear;
• a second gear disposed in parallel with and engaged with the first gear;
• a third gear disposed in parallel with and engaged with the second gear;
• and
• a casing housing the change-direction gear set, the first gear, the second gear and the third gear.