Eccentric Oscillating Gear Bearing Spacers for Collision Noise Reduction
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Solution Overview
Problem
Eccentric oscillating gear devices with full roller structures in their bearings experience collision sounds due to rolling elements colliding with each other during operation.
Innovation Solution
The introduction of a spacer between some adjacent rolling elements in the eccentric bearing reduces the circumferential gap, thereby minimizing the collision sound by reducing the speed difference between rolling elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a full roller structure is used in the eccentric bearing, then the load-bearing capacity is improved, but rolling elements collide with each other generating collision sound
Solution Approach 1:
A non-rolling-element object (spacer) is introduced as an intermediary between adjacent rolling elements. This spacer prevents direct contact between rolling elements during operation, eliminating the collision sound while allowing the full roller structure to maintain its load-bearing capacity. The spacer acts as a mediator that resolves the harmful interaction between rolling elements without compromising the overall bearing structure.
2Object-generated harmful factors
If spacers are disposed between all adjacent rolling elements, then collision sound is reduced, but the device complexity increases
Solution Approach 1:
Instead of uniformly placing spacers between all adjacent rolling elements, the invention selectively places spacers only in specific locations where collision sounds occur or are most problematic. This local application approach reduces the overall number of spacers needed, thereby minimizing the increase in device complexity while still effectively reducing collision sounds in the critical areas.
3Strength
If the number of rolling elements is increased, then the load distribution is improved, but the circumferential gap increases causing more collision sound
Solution Approach 1:
The invention converts the harmful effect of increased circumferential gap (which causes more collision sound) into a beneficial arrangement. By strategically positioning spacers in relation to the increased number of rolling elements, the design utilizes the larger gap to optimize spacer placement, ensuring that spacers effectively prevent collisions while the increased number of rolling elements continues to provide improved load distribution. The harmful gap becomes an opportunity for optimized spacer positioning.
Data Source
Figure 1
Figure 2A~2B
Figure 3
AI summary
Provided is an eccentric oscillating gear device (10) capable of reducing a collision sound of a rolling element (50) . The eccentric oscillating gear device (10) includes a crankshaft (14) including an eccentric body (12), an oscillating gear (16) oscillated by the eccentric body (12), and an eccentric bearing (20) disposed between the oscillating gear (16) and the eccentric body (12). The eccentric bearing (20) includes a plurality of rolling elements (50). Some rolling elements (50) adjacent in a circumferential direction of the plurality of rolling elements (50) are in contact with each other. A spacer (62) is disposed between some of the other rolling elements (50) adjacent in the circumferential direction of the plurality of rolling elements (50).