Modular Motor Assembly with Combination Key for Zero Backlash
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Solution Overview
Problem
Conventional motor assembly structures require professional skills for connection, making it difficult for general users to achieve modularization and resulting in assembly length and accuracy issues.
Innovation Solution
A modular motor assembly structure with a standard interface size and specially designed combination keys that include a shaft hole and key groove, allowing for easy connection and adjustment of mounting tolerances, providing elastic cushioning and rigid transmission of rotating power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a straight-through module is used to connect the motor assembly structure, then the overall length is shortened and rigidity transmission is improved, but professional skill is required for assembly and it becomes difficult for general users to achieve modularization
Solution Approach 1:
The connection interface is segmented into a shaft hole in the motor assembly structure and a receiving slot in the driving shaft, with a combination key as a separate component. This segmentation allows each part to be independently manufactured with standard dimensions, enabling general users to assemble the connection without requiring professional skills while maintaining the shortened overall length benefit.
Solution Approach 2:
The combination key serves multiple functions: it fills the gap between the shaft hole and receiving slot, provides tolerance adjustment through its elastic deformation capability, and enables rigid power transmission. This universal component allows the same standardized interface to work across different motor assembly structures and application devices, achieving ease of operation.
2Manufacturing precision
If a straight-through module is used to connect the motor assembly structure, then rigidity transmission and response speed are improved, but assembly tolerance adjustment and specific installation process are required
Solution Approach 1:
The combination key is designed with elastic deformation capability that allows it to automatically adjust to tolerance variations during assembly. When inserted, the elastic material deforms to fill gaps and accommodate dimensional variations, eliminating the need for pre-adjustment or complex installation procedures while maintaining rigid power transmission.
Solution Approach 2:
The combination key utilizes elastic deformation as a parameter change mechanism. By selecting appropriate elastic materials and designing the key geometry, the system can accommodate a range of tolerance values without requiring precise assembly, thus reducing assembly process complexity while maintaining manufacturing precision.
3Adaptability or versatility
If standard interface size is used in the motor assembly structure, then a wide range of users can directly connect with application devices and modularization is achieved, but common mounting components such as couplings and motor flanges must be omitted
Solution Approach 1:
The shaft hole, receiving slot, and combination key work together as an integrated standardized interface system. This merged design replaces traditional separate mounting components like couplings and flanges, achieving structure simplification while maintaining adaptability through the standardized dimensions that can connect with various application devices.
4Reliability
If the combination key has continuously increasing thickness from front end to rear end, then elastic cushioning and tolerance adjustment are achieved, but the geometric profile becomes more complex
Solution Approach 1:
The combination key features non-uniform thickness distribution with continuously increasing thickness from front end to rear end. This local quality variation provides elastic cushioning capability at the front end while maintaining structural integrity at the rear end, achieving reliability without requiring complex overall geometry.
Data Source
AI summary
A modular motor assembly structure is disclosed and configured to couple with a drive shaft of an application device. The drive shaft includes a receiving slot. The modular motor assembly includes a main body and a combination key. The main body includes a shaft hole and a key groove. The shaft hole includes an opening and a central axis. The key groove is disposed on a side wall around the shaft hole and parallel to a central axis of the shaft hole. The combination key has a front end and a rear end. When one end of the drive shaft is inserted into the shaft hole along the central axis of the shaft hole, the combination key is at least partially accommodated in the receiving slot, and the front end faces the key groove. The combination key has a continuously increasing thickness from the front end to the rear end.