Reverse rotation prevention mechanism and motor with reducer
AssigneeMabuchi Motor Co., Ltd.
InventorsRyoichi Sugita, Toru Imai
Life of this patent
Estimating the term…
Abstract
A reverse rotation prevention mechanism is provided on a torque transmission path between an output shaft and a driving shaft of a motor. The reverse rotation prevention mechanism includes: a first frictional force generation unit configured to inhibit a lock plate provided on the torque transmission path from rotating relative to another member when an external force is exerted on the output shaft; and a second frictional force generation unit configured to generate a braking force that prevents reverse rotation when an external force is exerted on the output shaft by causing a portion of the lock plate to be pressed. The first frictional force generation unit is provided in an area different from the second frictional force generation unit.
Claims12
A reverse rotation prevention mechanism provided on a torque transmission path between an output shaft and a driving shaft of a motor, comprising:
- a first frictional force generation unit that resists rotation of a braking rotational member provided on the torque transmission path relative to a non-rotating fixed member;
- and
- a second frictional force generation unit that generates, when an external force is exerted on the output shaft, a braking force that prevents reverse rotation, wherein
- the second frictional force generation unit generates the braking force as a portion of the braking rotational member is pressed against the second frictional force generation unit as the first frictional force generation unit resists rotation of the braking rotational member.
A reverse rotation prevention mechanism provided on a torque transmission path between an output shaft and a driving shaft of a motor, comprising:
- a worm, to which a rotational force of the driving shaft of the motor is transmitted via the torque transmission path;
- a worm wheel in mesh with the worm, the worm wheel coupled to the output shaft such that the rotational force exerted on the worm wheel is transmitted to the output shaft;
- a first frictional force generation unit that resists rotation of a braking rotational member provided on the torque transmission path relative to a non-rotating fixed member;
- a second frictional force generation unit that generates, when an external force is exerted on the output shaft, a first braking force that prevents reverse rotation;
- a braking and pressing member that moves axially away from the braking rotational member due to a reactive force responsive to a force that presses the braking rotational member against the second frictional force generation unit when an external force is exerted on the output shaft;
- and
- a third frictional force generation unit that generates, when the external force is exerted on the output shaft, a second braking force that prevents reverse rotation, by causing a portion of the braking and pressing member to be pressed, wherein
- the second frictional force generation unit generates the braking force as a portion of the braking rotational member is pressed against the second frictional force generation unit as the first frictional force generation unit resists rotation of the braking rotational member.
A reverse rotation prevention mechanism provided on a torque transmission path between an output shaft and a driving shaft of a motor, comprising:
- an output shaft side rotational member coupled to the output shaft;
- a braking rotational member provided adjacent to the output shaft side rotational member;
- a driving shaft side rotational member engaged with and rotated along with the output shaft side rotational member and the braking rotational member when the motor is driven, the driving shaft side rotational member being coupled toward the driving shaft of the motor;
- and
- a frictional force generation unit which generates, when an external force is exerted on the output shaft, a braking force that prevents reverse rotation, by causing the output shaft side rotational member to move axially away from the braking rotational member and cause a portion of the braking rotational member to be pressed.
Dependencies are inferred from the claim text.