Motor with speed reducer

A speed reducer-equipped motor comprising:

• a motor with a rotating shaft;
• a first gear which rotates in response to input of torque from the rotating shaft of the motor;
• an eccentric shaft which connects with the first gear and includes a first support and a second support which are offset from a rotating shaft of the first gear in a radial direction thereof;
• a stationary gear which is arranged outside the eccentric shaft in a radial direction of the eccentric shaft and includes a stationary gear stopper, the stationary gear being stopped from rotating by securement thereof with a housing;
• a transmission gear which is retained by the first support and revolves around the rotating shaft of the first gear in response to rotation of the first gear together with the eccentric shaft;
• an output member which rotates in response to revolution of the transmission gear;
• and
• a lock gear which is retained by the second support, meshes with the stationary gear, and includes a lock gear stopper, the lock gear revolving around the rotating shaft of the first gear and rotating about an axis thereof in response to the rotation of the first gear along with the eccentric shaft, revolution and rotation of the lock gear being stopped by contact of the lock gear stopper with the stationary gear stopper, thereby stopping the output gear from rotating, the lock gear being configured to orient a first mechanical load and a second mechanical load in opposite directions, the first mechanical load being a mechanical load acting on a contact between the lock gear stopper and the stationary gear stopper when the lock gear stopper contacts with the stationary gear stopper, the second mechanical load being a mechanical load acting on meshed portions of teeth of the lock gear and the stationary gear when the lock gear stopper contacts with the stationary gear stopper.