Eccentric Bearing Spacer Layout for Quieter Oscillating Gears
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Solution Overview
Problem
Eccentric oscillating gear devices with full roller structures generate collision sounds due to adjacent rolling elements colliding with each other during operation.
Innovation Solution
Incorporating spacers between some adjacent rolling elements in the eccentric bearing to reduce the circumferential gap and facilitate contact between others, thereby reducing the speed difference and collision sound.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a full roller structure is used in the eccentric bearing, then the rolling element filling rate is increased, but adjacent rolling elements collide with each other generating collision sound
Solution Approach 1:
A circumferential gap is introduced as an intermediary space between adjacent rolling elements in the eccentric bearing. This gap prevents direct contact and collision between rolling elements during operation, thereby eliminating collision sound while preserving the full roller structure's high filling rate advantage. The gap acts as a mediator that allows rolling elements to move independently without interfering with each other.
2Object-generated harmful factors
If spacers are disposed between all rolling elements to prevent collision, then collision sound is reduced, but the rolling element filling rate decreases
Solution Approach 1:
Instead of uniformly spacing all rolling elements with spacers throughout the eccentric bearing, the invention selectively applies spacing only where necessary to prevent collision sound. The circumferential gap is introduced locally between specific adjacent rolling elements that would otherwise collide, rather than imposing a uniform spacing pattern on all rolling elements. This localized approach maintains high filling rate while effectively reducing collision sound.
3Object-generated harmful factors
If the circumferential gap between rolling elements is increased to prevent collision, then collision sound is reduced, but the structural stability and strength of the gear device decreases
Solution Approach 1:
The invention introduces a circumferential gap that is sufficient to prevent collision sound but not excessively large to compromise structural stability. The gap size is optimized to be just enough to eliminate harmful collisions between rolling elements while maintaining adequate structural integrity and load-bearing capacity of the eccentric bearing assembly.
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
The implementation of spacers between rolling elements in the eccentric bearing reduces collision sounds and enhances the strength and stability of the gear device while maintaining a high rolling element filling rate.
Implementation Method 1
a crankshaft including an eccentric body; an oscillating gear oscillated by the eccentric body
Implementation Method 2
the eccentric bearing includes a plurality of rolling elements
Data Source
AI summary
An eccentric oscillating gear device includes: a crankshaft including an eccentric body; an oscillating gear oscillated by the eccentric body; and an eccentric bearing disposed between the oscillating gear and the eccentric body, in which the eccentric bearing includes a plurality of rolling elements, some rolling elements adjacent in a circumferential direction of the plurality of rolling elements are in contact with each other, and a spacer is disposed between some of the other rolling elements adjacent in the circumferential direction of the plurality of rolling elements.