Motor device with support part to support an end of a shaft
Provided is a motor device in which the entire length of a motor can be shortened as much as possible while the positional deviation of a shaft in a thrust direction is prevented and a shaft length sufficient to suppress the inclination of the shaft can be ensured. A motor device provided with a shaft with a rotor fixed on the outer surface thereof, and a thrust pressurization unit that supports an end opposite the output side of the shaft while pressurizing the end in an axial direction may be configured so that the thrust pressurization unit may be provided with a coil spring that pressurizes the end opposite the output side of the shaft in the axial direction and the thrust pressurization unit may be disposed inside the rotor.
1. A motor device comprising:
a motor main body which is provided with a stator and a rotor;
a gear part which is driven by the rotor and through which a driving force is outputted to an outside of the motor device;
a case accommodating the motor main body and the gear part;
a shaft which is fixed with the rotor on an outer peripheral face of the shaft and is formed with a pinion on a portion that is protruded from an output side end face of a stator; and
a support part structured to support an output side end part of the shaft; and
an output side flat plate which is made of metal and is fixed to an output side end face of the stator;
wherein a gear of the gear part is engaged with the pinion for outputting the driving force to the outside;
wherein the support part comprises:
an extended part which is bent so as to protrude in a tongue piece-like shape from the output side flat plate toward the output side end part of the shaft;
a slide part which is made of resin and formed at a tip end of the extended part, and the slide part being slid on the shaft; and
connecting parts which are made of resin and connected with the slide part and the output side flat plate, the connecting parts being separately disposed on opposite sides of the extended part so as to reinforce the extended part by extending over the slide part and the output side flat plate.
2. The motor device according to claim 1 , wherein a base end of the extended part and the connecting parts are provided along an outer peripheral face of the shaft in a circumferential direction.
3. The motor device according to claim 2 , wherein the extended part, the slide part and the connecting parts are integrally formed by insert molding.
4. The motor device according to claim 2 , further comprising a thrust pressurization part structured to pressurize an opposite-to-output side end part of the shaft in an axial direction,
wherein the thrust pressurization part is disposed on an inner side of the rotor.
5. The motor device according to claim 4 , wherein the extended part, the slide part, and the connecting parts are integrally formed by insert molding.
6. The motor device according to claim 4 , wherein
the thrust pressurization part comprises:
a coil spring which is formed in a conical shape and pressurizes the opposite-to-output side end part of the shaft in the axial direction;
a ball which is abutted with the opposite-to-output side end part of the shaft; and
a bearing member which supports the opposite-to-output side end part of the shaft through the ball and is pressurized by the coil spring in the axial direction; and
the bearing member comprises:
an opposite-to-output side slide part which holds the ball; and
a reinforcing part which reinforces the opposite-to-output side slide part and is protruded to an opposite-to-output side; and
the reinforcing part is disposed on an inner side of the coil spring.
7. The motor device according to claim 4 , wherein the thrust pressurization part comprises:
a ball which is abutted with the opposite-to-output side end part of the shaft;
a bearing member which supports the ball at a substantially center position in a plane direction; and
a bearing holding part which holds the bearing member so as to surround an outer peripheral face of the bearing member; and
wherein a center position in the axial direction of an engagement face where the bearing member and the bearing holding part are engaged with each other and a center position of the ball in the axial direction are coincided with each other.
8. The motor device according to claim 4 , wherein gears of the gear part including the gear engaged with the pinion are supported between the output side flat plate and the case so as to be parallel to the shaft.
9. The motor device according to claim 4 , wherein
the stator comprises a stator assembly which is provided with an inner stator core, an outer stator core, and a coil bobbin that is disposed between the inner stator core and the outer stator core and around which a drive coil is wound, and
the output side flat plate is fixed to an output side end face of the outer stator core.