Eccentric Roller Bearing Track for Axial Force Transfer
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Solution Overview
Problem
Conventional roller bearing designs for wobble gearing are suboptimal in transferring axial forces due to variable force application on shoulder portions depending on rotational position, leading to reduced bearing lifespan.
Innovation Solution
The roller bearing features track elements with a track base and shoulders having circular circumferential lines where all center points are different, making the circumferential lines eccentric to each other, allowing for improved force absorption and transfer, particularly through the use of friction-welded pins and case-hardened steel construction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional concentric track elements are used, then the bearing structure is simple and easy to manufacture, but the axial force transfer is suboptimal and bearing lifespan is reduced
Solution Approach 1:
The patent applies asymmetry by designing the track element with eccentric circumferential lines where the center points of the track base and shoulder circumferential lines are offset from each other. This asymmetric geometry ensures that the shoulder portion is optimally positioned to absorb axial forces regardless of the rotational position, resolving the contradiction between simple concentric design and reliable force transfer.
2Reliability
If the track element uses concentric circumferential lines, then manufacturing is easier, but force application on shoulders is variable and unreliable
Solution Approach 1:
The eccentric positioning of circumferential lines creates an asymmetric track element where the shoulder is offset from the track base center. This ensures consistent force application on the shoulder portion during axial load transfer, improving reliability while the offset distance can be optimized for manufacturability.
3Force
If conventional ball bearing design is used, then the installation space is compact, but the axial force transfer capability is insufficient
Solution Approach 1:
The patent applies local quality by enhancing specific regions of the track element - particularly the shoulder portion - to optimize axial force absorption. The eccentric geometry concentrates the force transfer capability in the shoulder region while maintaining overall compact dimensions, resolving the contradiction between force transfer capability and installation space.
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
This design significantly extends the lifespan of the roller bearing while maintaining comparable installation space and load conditions, resulting in a quantum leap in roller bearing performance.
Implementation Method 1
case-hardened steel construction with friction-welded pins
Implementation Method 2
case-hardened steel construction
Data Source
AI summary
A roller bearing for at least one set of roller bodies, which are disposed in an annular manner, the roller bearing having at least one track element with a track, on which the roller bodies are provided for rolling. The track comprises a track base having a circular circumferential line. The track element comprises, on each axial side of the track base, a shoulder or a rim for the roller bodies, each shoulder or rim having a circular circumferential line. The track element is formed such that, as viewed perpendicular to the planes defined by the circumferential lines, all center points of the three circumferential lines are different from each other.