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US 8,176,804 B2Granted
Motor actuator and opening/closing device
AssigneeNidec Sankyo Corporation
InventorSeiichiro Noritake
Life of this patent
Estimating the term…
Abstract
In a driving force transmission mechanism in a motor type damper device, when a small AC synchronous motor rotates in one direction and a tooth-missing gear part of a tooth-missing gear engages with the first rack part of a rack member the rack member is moved upward to operate a baffle in an open direction and, when the tooth-missing gear part engages with the second rack part of the rack member, the rack member is moved downward to operate the baffle in a close direction. In this manner, even when the baffle and the rack member are operated in both directions, the tooth-missing gear is required to be rotated in only one direction and the rotation of the small AC synchronous motor is not required to be reversed. Therefore, the structure of a control circuit for the motor type damper device can be simplified.
Claims9
A motor actuator in which a driving force of a motor is transmitted to a driven member through a driving force transmission mechanism to operate the driven member,
- wherein, the driving force transmission mechanism comprises:
- a gear train part having a gear which is rotationally driven by the motor;
- a tooth-missing gear which is rotationally driven by the gear;
- and
- a rack member which is linearly driven by the tooth-missing gear to operate the driven member;
- wherein the tooth-missing gear is provided with a gear part formed with teeth around an entire circumference and structured to engage with the gear, and a tooth-missing gear part, and a teeth part is formed at a predetermined position of the tooth-missing part over only a part of the entire circumference in a circumferential direction of the tooth-missing gear, and a side area in the circumferential direction of the teeth part is formed with a move preventing part for preventing movement of the rack member;
- and
- the rack member is provided with a first rack part, which causes the rack member to move in one direction to a first position when the motor rotates in one direction and the first rack part engages with the teeth part, and a second rack part which causes the rack member to move in the other direction to a second position when the motor rotates in the one direction and the second rack part engages with the teeth part;
- the first rack part and the second rack part are extended in parallel to each other so as to interpose the tooth-missing gear between the first rack part and the second rack part;
- one end portion of the first rack part and one end portion of the second rack part are connected with each other through a connecting part;
- and
- an other end portion of the first rack part and an other end portion of the second rack part are separated from each other so as to form a separated space between the other end portions of the first rack part and the second rack part;
- the gear is disposed on an opposite side to the connecting part with respect to the tooth-missing gear;
- the gear is engaged with the gear part of the tooth-missing gear through the separated space;
- when the rack member is moved to one of the first position and the second position, the teeth part of the tooth-missing gear part is rotated until the teeth part is separated from the first rack part and the second rack part;
- when the rack member is located at at least one of the first position and the second position, movement of the rack member is prevented by the move preventing part of the tooth-missing gear part;
- the move preventing part of the tooth-missing gear part is formed in a preventing plate part whose outer circumferential edge portion is formed in a circular arc shape,
- the first rack part is formed with two engaging parts which are disposed so as to be separated from each other;
- and
- when the rack member is located at least one of the first position and the second position, the two engaging parts of the rack member are engaged with the preventing plate part formed in the circular arc shape to prevent the movement of the rack member.
17 more elements
An opening/closing device comprising:
- a motor actuator in which a driving force of a motor is transmitted to an opening/closing member whose position is changed between an open position and a close position through a driving force transmission mechanism;
- wherein, the driving force transmission mechanism comprises:
- a gear train part having a gear which is rotationally driven by the motor;
- a tooth-missing gear which is rotationally driven by the gear;
- and
- a rack member which is linearly driven by the tooth-missing gear to operate the opening/closing member to the open position and the close position;
- wherein the tooth-missing gear is provide with a gear part formed with teeth around an entire circumference and structured to engage with the gear;
- and a tooth-missing gear part, a teeth part is formed at a predetermined position of the tooth-missing gear part over only a part of the entire circumference in a circumferential direction of the tooth-missing gear, and a side area in the circumferential direction of the teeth part is formed with a move preventing part for preventing movement of the rack member;
- and
- the rack member is provided with a first rack part, which causes the rack member to move in one direction to the open position when the motor rotates in one direction and the first rack part engages with the teeth part, and a second rack part which causes the rack member to move in the other direction to the close position when the motor rotates in the one direction and the second rack part engages with the teeth part;
- the first rack part and the second rack part are extended in parallel to each other so as to interpose the tooth-missing gear between the first rack part and the second rack part;
- and
- one end portion of the first rack part and one end portion of the second rack part are connected with each other through a connecting part;
- and
- when the rack member is moved to one of the open position and the close position, the teeth part of the tooth-missing gear part is rotated until the teeth part is separated from the first rack part and the second rack part;
- and
- when the rack member is located at least at one of the open position and the close position, movement of the rack member is prevented by the move preventing part of the tooth-missing gear part;
- the move preventing part of the tooth-missing gear part is formed in a preventing plate part whose outer circumferential edge portion is formed in a circular arc shape;
- and
- the first rack part is formed with two engaging parts which are disposed so as to be separated from each other;
- and
- when the rack member is located at least one of the open position and the close position, the two engaging parts of the rack member are engaged with the preventing plate part formed in the circular arc shape to prevent the movement of the rack member.
19 more elements
Dependencies are inferred from the claim text.