Gear Reducer Eccentric Transmission for Radial Downsizing
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Solution Overview
Problem
The existing gearmotor design with a gear reducer restricts the rotation of the revolving gear around its own axis, making it difficult to downsize the gear reducer and motor in both radial and axial directions.
Innovation Solution
A gear reducer and gearmotor design featuring an eccentric shaft with a supporting portion offset in the rotation radial direction, a transmitting gear with restricting projections, and an own-axis-rotation restricting member disposed between these projections, allowing the transmitting gear to revolve around the first gear while restricting its own-axis rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the revolving gear is restricted from rotating around its own axis by engaging with the inner peripheral surface of the restricting member, then the gear reducer can function properly, but the radial build of the restricting member cannot be reduced, which hinders downsizing of the gear reducer and gearmotor
Solution Approach 1:
The invention changes the engagement method from radial engagement (inner peripheral surface) to axial engagement (end surface). The restricting projections on the transmitting gear engage with the end surface of the restricting member, allowing the restricting member to be designed as a thin-walled structure without compromising its ability to restrict rotation, thereby enabling radial downsizing.
Solution Approach 2:
The restricting member is segmented into multiple thin-walled sections with restricting projections engaged at specific locations. This segmentation allows the restricting member to maintain its function while reducing overall radial build, as only specific portions need to provide restriction rather than the entire circumference requiring thick walls.
2Reliability
If a member is provided to restrict rotation of the revolving gear, then the gear reducer functions correctly, but the radial dimension increases, preventing downsizing of the gearmotor
Solution Approach 1:
The invention transitions the restriction mechanism from radial dimension to axial dimension. The restricting projections engage with the end surface of the restricting member rather than the inner peripheral surface, allowing the radial dimension to be minimized while maintaining reliable rotation restriction through axial engagement.
Solution Approach 2:
The restricting projections act as intermediaries between the transmitting gear and the restricting member. These projections transfer the restriction function from the inner peripheral surface engagement to the end surface engagement, enabling the restricting member to be designed with minimal radial build while maintaining its function.
Data Source
AI summary
A gear reducer has a helical gear, an eccentric shaft that is joined to the helical gear and has a first supporting portion that is offset in a rotation radial direction with respect to a rotation shaft of the helical gear, and a slider plate that is disposed at a radial direction outer side of the eccentric shaft. Further, the gear reducer has a transmitting gear that is supported at a first supporting portion, and whose rotation around its own axis is restricted due to the transmitting gear being engaged with the slider plate, and that revolves due to the helical gear rotating together with the eccentric shaft, and has an output gear body that rotates due to the transmitting gear revolving. The transmitting gear has a pair of restricting projections that project-out toward the slider plate side, and the slider plate is disposed between the pair of restricting projections.