Actuator unit

1. An actuator unit that shifts a door lock device between a locked position and an unlocked position, the actuator unit comprising:

an output shaft that rotates around an axis;

an actuator that rotates the output shaft between a first angular position and a second angular position with driving force;

a drive gear that rotates due to the driving force of the actuator; and

a transmission mechanism that transmits rotation of the drive gear to the output shaft;

wherein the transmission mechanism allows, when the output shaft is placed in any one of the first angular position and the second angular position, rotation of the output shaft from the one of the first and second angular positions to the other of the first and second angular positions without causing rotation of the drive gear,

wherein the transmission mechanism allows, when the drive gear is rotated to rotate the output shaft from any one of the first angular position and the second angular position to the other of the first and second angular positions, rotation of the drive gear to be transmitted to the output shaft, and, upon the output shaft being placed in the other of the first and second angular positions, the driving force on the output shaft to be released, and rotation of the drive gear to be stopped,

wherein the transmission mechanism includes a first transmission mechanism and a second transmission mechanism,

wherein the first transmission mechanism includes:

a first stopper member that protrudes from a first side of the drive gear;

a first lever that extends from the output shaft to face a first side of the drive gear, includes an arc-shaped first stopper face centering around the axis of the output shaft, places the first stopper face in a first movement range in which the first stopper member moves due to rotation of the drive gear when the output shaft is placed in the first angular position, and places the first stopper face outside the first movement range when the output shaft is placed in the second angular position; and

a first engaging member that is arranged on the first side of the drive gear, and engages with the first lever to rotate the output shaft to the second angular position when the output shaft is placed in the first angular position and the drive gear rotates in a direction to distance the first stopper member from the first stopper face, and

wherein the second transmission mechanism includes:

a second stopper member that protrudes from a second side of the drive gear;

a second lever that extends from the output shaft to face the second side of the drive gear, includes an arc-shaped second stopper face centering around the axis of the output shaft, places the second stopper face in a second movement range in which the second stopper member moves due to rotation of the drive gear when the output shaft is placed in the second angular position, and places the second stopper face outside the second movement range when the output shaft is placed in the first angular position; and

a second engaging member that is arranged on the second side of the drive gear, and engages with the second lever to rotate the output shaft to the first angular position when the output shaft is placed in the second angular position and the drive gear rotates in a direction to distance the second stopper member from the second stopper face.

2. An actuator unit for shifting a door lock device between a locked position and an unlocked position, comprising:

an output shaft rotatable around an axis;

an actuator for rotating the output shaft between a first angular position and a second angular position with driving force;

a drive gear rotatable due to the driving force of the actuator; and

a transmission mechanism for transmitting rotation of the drive gear to the output shaft;

wherein the transmission mechanism is configured to allow, when the output shaft is placed in any one of the first angular position and the second angular position, rotation of the output shaft from the one of the first and second angular positions to the other of the first and second angular positions without causing rotation of the drive gear,

wherein the transmission mechanism is configured to allow, when the drive gear is rotated to rotate the output shaft from any one of the first angular position and the second angular position to the other of the first and second angular positions, rotation of the drive gear to be transmitted to the output shaft, and, upon the output shaft being placed in the other of the first and second angular positions, the driving force on the output shaft to be released, and rotation of the drive gear to be stopped,

wherein the transmission mechanism includes a first transmission mechanism located between the output shaft and a first side of the drive gear, and is configured to rotate the output shaft from the first angular position to the second angular position when the drive gear rotates, and

wherein the first transmission mechanism includes:

a first stopper member that protrudes from the first side of the drive gear;

a first lever that extends from the output shaft to face the first side of the drive gear, is configured to place a first stopper face in a first movement range in which the first stopper member moves due to rotation of the drive gear when the output shaft is placed in the first angular position, and is configured to place the first stopper face outside the first movement range when the output shaft is placed in the second angular position; and

a first engaging member that is arranged on the first side of the drive gear, and that is configured to engage with the first lever to rotate the output shaft to the second angular position when the output shaft is placed in the first angular angle position and the drive gear rotates in a direction to distance the first stopper member from the first stopper face.

3. The actuator unit according to claim 2 , wherein the transmission mechanism further includes a second transmission mechanism located between the output shaft and a second side of the drive gear, and is configured to rotate the output shaft from the second angular position to the first angular position when the drive gear rotates.

4. The actuator unit according to claim 3 , wherein the second transmission mechanism includes:

a second stopper member that protrudes from the second side of the drive gear;

a second lever that extends from the output shaft to face the second side of the drive gear, is configured to place a second stopper face in a second movement range in which the second stopper member moves due to rotation of the drive gear when the output shaft is placed in the second angular position, and is configured to place the second stopper face outside the second movement range when the output shaft is placed in the first angular position; and

a second engaging member that is arranged on the second side of the drive gear, and that is configured to engage with the second lever to rotate the output shaft to the first angular position when the output shaft is placed in the second angular position and the drive gear rotates in a direction to distance the second stopper member from the second stopper face.

5. The actuator unit according to claim 2 , wherein the actuator is an electric motor fixed with a worm gear on a drive shaft, and

wherein the drive gear is a worm wheel that engages with the worm gear.

6. An actuator unit for shifting a door lock device between a locked position and an unlocked position, comprising:

an output shaft rotatable around an axis;

an actuator for rotating the output shaft between a first angular position and a second angular position with driving force;

a drive gear rotatable due to the driving force of the actuator; and

a transmission mechanism for transmitting rotation of the drive gear to the output shaft;

wherein the transmission mechanism is configured to allow, when the output shaft is placed in any one of the first angular position and the second angular position, rotation of the output shaft from the one of the first and second angular positions to the other of the first and second angular positions without causing rotation of the drive gear,

wherein the transmission mechanism is configured to allow, when the drive gear is rotated to rotate the output shaft from any one of the first angular position and the second angular position to the other of the first and second angular positions, rotation of the drive gear to be transmitted to the output shaft, and, upon the output shaft being placed in the other of the first and second angular positions, the driving force on the output shaft to be released, and rotation of the drive gear to be stopped,

wherein the transmission mechanism includes a second transmission mechanism located between the output shaft and a second side of the drive gear, and is configured to rotate the output shaft from the second angular position to the first angular position when the drive gear rotates, and

wherein the second transmission mechanism includes:

a second stopper member that protrudes from the second side of the drive gear;

a second lever that extends from the output shaft to face the second side of the drive gear, is configured to place a second stopper face in a second movement range in which the second stopper member moves due to rotation of the drive gear when the output shaft is placed in the second angular position, and is configured to place the second stopper face outside the second movement range when the output shaft is placed in the first angular position; and

a second engaging member that is arranged on the second side of the drive gear, and that is configured to engage with the second lever to rotate the output shaft to the first angular position when the output shaft is placed in the second angular position and the drive gear rotates in a direction to distance the second stopper member from the second stopper face.

7. The actuator unit according to claim 6 , wherein the transmission mechanism further includes a first transmission mechanism located between the output shaft and a first side of the drive gear, and is configured to rotate the output shaft from the first angular position to the second angular position when the drive gear rotates.

8. The actuator unit according to claim 6 , wherein the actuator is an electric motor fixed with a worm gear on a drive shaft, and

wherein the drive gear is a worm wheel that engages with the worm gear.