Bearing Assembly Inner Ring Contact Gap Design
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Solution Overview
Problem
Bearing arrangements for rotating shafts experience deformation under varying loads, leading to increased wear and reduced service life due to the deformation of shafts and bearing components.
Innovation Solution
A bearing arrangement featuring two roller bearings with inner rings that are designed to maintain contact only within a specific contact surface diameter, creating a gap between the guide ribs to prevent deformation and reduce wear, thereby increasing the service life of the bearings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the inner rings of the roller bearings are in direct contact over the full running surface diameter, then the bearing arrangement provides stable support, but the guide ribs press against each other during shaft deformation causing increased wear and reduced service life
Solution Approach 1:
The patent extracts the harmful contact between guide ribs by reducing the contact surface diameter of the inner rings. The inner rings are designed with a contact surface diameter that is smaller than the maximum outer diameter, creating a gap between the guide ribs that prevents them from pressing against each other during shaft deformation, thereby eliminating the wear problem.
Solution Approach 2:
The patent applies local quality by differentiating between the contact surface area and the outer diameter of the inner rings. The contact surface diameter is intentionally made smaller than the maximum outer diameter, creating a localized gap region between the guide ribs while maintaining full contact on the running surfaces for proper bearing function. This localized modification prevents guide rib contact without compromising bearing support.
2Reliability
If the contact surface diameter between inner rings is reduced to create a gap, then wear is reduced and service life is increased, but the bearing arrangement requires precise manufacturing to maintain proper contact geometry
Solution Approach 1:
The patent changes the critical parameter from contact surface diameter equal to maximum outer diameter to contact surface diameter smaller than maximum outer diameter. This parameter change creates a deliberate gap between guide ribs that prevents wear during deformation. The invention specifies that the contact surface diameter should be smaller than the average of the maximum diameters of the running surfaces, providing a clear design criterion that balances wear prevention with manufacturing feasibility.
Data Source
AI summary
A bearing arrangement 100 comprises a first rolling bearing 110 and a second rolling bearing 120. The first rolling bearing 110 includes an inner ring 112, which can be connected to a shaft 102 in a rotationally fixed manner. The inner ring 112 of the first rolling bearing 110 has a running surface 114 for rolling elements 116 of the first rolling bearing 110. The second rolling bearing 120 comprises an inner ring 122, which can also be connected to the shaft 102 in a rotationally fixed manner. The inner ring 122 of the second rolling bearing 120 has a running surface 124 for rolling elements 126 of the second rolling bearing 120.The inner ring 112 of the first rolling bearing 110 and the inner ring 122 of the second rolling bearing 120 are designed such that the inner ring 112 of the first rolling bearing 110 and the inner ring 122 of the second rolling bearing 120 are in contact with each other exclusively within a contact surface diameter 132, which is smaller than the average of a maximum diameter of the running surface 114 of the inner ring 112 of the first rolling bearing 110 and a maximum outer diameter of the inner ring 112 of the first rolling bearing 110, and is smaller than the average of a maximum diameter of the running surface 124 of the inner ring 122 of the second rolling bearing 120 and a maximum outer diameter of the inner ring 122 of the second rolling bearing 120, when the inner ring 112 of the first rolling bearing 110 and the inner ring 122 the second rolling bearing 120 are arranged directly adjacent to each other.