Tooth-Missing Gear Motor Actuator for Bidirectional Damper Motion
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Solution Overview
Problem
Conventional motor actuators for opening/closing devices in refrigerators require motor rotation reversal for bidirectional operation, complicating the control circuit and increasing the device's size due to unnecessary force interactions between rack parts and gear components.
Innovation Solution
A motor actuator design featuring a tooth-missing gear mechanism where a single gear rotation drives a rack member in both directions using distinct rack parts, eliminating the need for motor rotation reversal and reducing the device's size by allowing the rack member to reciprocate only in the direction of the extended rack parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If motor rotation reversal is used for bidirectional operation of the driven member, then the driven member can be operated in both directions, but the control circuit structure becomes complicated
Solution Approach 1:
The rack member is segmented into a first rack part and a second rack part positioned at different locations. The gear is segmented with a tooth-missing gear part that selectively engages with either the first or second rack part. This segmentation allows unidirectional gear rotation to produce bidirectional rack movement, simplifying the control circuit while maintaining bidirectional operation capability.
Solution Approach 2:
The tooth-missing gear part acts as an intermediary mechanism between the motor and the rack member. By selectively engaging with different rack parts, it translates unidirectional gear rotation into bidirectional rack movement, eliminating the need for motor rotation reversal and simplifying the control circuit structure.
2Adaptability or versatility
If motor rotation reversal is used for bidirectional operation, then the driven member can move in both directions, but the device size increases due to unnecessary force interactions
Solution Approach 1:
The rack member is divided into first and second rack parts positioned at different locations along the gear's rotation path. The gear contains a tooth-missing gear part that selectively engages with either the first or second rack part during unidirectional rotation. This segmentation eliminates unnecessary force interactions between rack parts and reduces the device size while maintaining bidirectional operation capability.
Solution Approach 2:
The invention extracts and eliminates the unnecessary force interaction problem by using a tooth-missing gear design. When the gear engages with the first rack part, the second rack part is disengaged, and vice versa. This extraction of the problematic force interaction reduces device size while preserving bidirectional operation.
3Device complexity
If the gear rotates in one direction only, then the control circuit is simplified, but the driven member cannot be operated in both directions
Solution Approach 1:
The invention adds a spatial dimension to the gear-rack interaction by positioning the first and second rack parts at different angular positions around the gear's rotation path. The tooth-missing gear part selectively engages with different rack parts at different rotation angles, enabling bidirectional operation through unidirectional gear rotation and simplifying the control circuit.
Solution Approach 2:
The rack member is segmented into first and second rack parts at different positions, and the gear is segmented with a tooth-missing gear part. This segmentation allows the gear to engage with different rack parts during different phases of its unidirectional rotation, achieving bidirectional operation without requiring bidirectional motor rotation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Simplifies the control circuit and reduces the motor actuator's size by enabling unidirectional gear rotation to achieve bidirectional operation without motor reversal, while minimizing unnecessary force interactions and optimizing the operating space.
Implementation Method 1
the driving force transmission mechanism comprises a gear which is rotationally driven by the motor and a rack member which is linearly driven by the gear
Implementation Method 2
the gear is provided with a tooth-missing gear part in which a teeth part is formed at a predetermined position in a circumferential direction of the gear, and the rack member is provided with a first rack part which causes the rack member to move in one direction when the motor rotates in one direction
Data Source
AI summary
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.