Radiating Shaft Coupling Structure for Angular Offset Noise Reduction
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Solution Overview
Problem
Worm reducers with tilted worm shafts experience angular offset during torque transmission, leading to a loss of radial load balance and generation of abnormal noise in connected electric motors due to the cushioning member's inability to effectively cancel out radial loads.
Innovation Solution
A shaft coupling design featuring a first coupling member with protrusions and a second coupling member with corresponding protrusions, along with a cushioning member having radiating portions, which maintains a minimum clearance angle to distribute radial loads effectively and reduce strain on the electric motor, thereby minimizing noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If torque is transmitted in an angular offset state to accommodate tilted worm shaft configuration, then the worm reducer can reduce backlash through tilted worm shaft mechanism, but abnormal noise is generated from the connected electric motor due to unbalanced radial load on the cushioning member
Solution Approach 1:
The cushioning member is designed with asymmetric load distribution features where the radial load is intentionally distributed unevenly across its surface. The load-bearing surface area and stress concentration points are strategically positioned to counterbalance the unbalanced radial load caused by angular offset, transforming the symmetric cushioning structure into an asymmetric load management system that eliminates abnormal noise while maintaining adaptability to tilted shaft configurations
2Stability of the object's composition
If a cushioning member is provided between the output shaft and worm shaft to smooth out displacement, then shaft misalignment is compensated, but the radial load balance is lost in angular offset state causing abnormal noise
Solution Approach 1:
The cushioning member incorporates localized structural variations with different regions having distinct mechanical properties. Certain areas are designed with enhanced load-bearing capacity while others provide flexibility, creating zones of differential stiffness and damping. This local quality differentiation allows the cushioning member to selectively absorb and distribute radial loads in a way that maintains overall balance even during angular offset operation, preventing abnormal noise generation
Data Source
AI summary
A shaft coupling includes a first coupling member, a second coupling member, and a cushioning member. The first coupling member includes first protrusions. The second coupling member includes second protrusions. The cushioning member includes a plurality of radiating portions. When the first coupling member and the second coupling member are arranged coaxially and the first coupling member and the second coupling member are in an unloaded state, predetermined paired facing surfaces have a minimum clearance angle present on a radially outer side with respect to a center of the radiating portion in a radiating direction. The predetermined paired facing surfaces are at least one of first paired facing surfaces and second paired facing surfaces.