Threaded Bearing Assembly for Easy Rotor Actuator Maintenance
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Solution Overview
Problem
The maintenance of bearing assemblies in helicopter main rotor actuators is cumbersome and costly due to the need for specialized equipment to access and replace worn-out spherical bearings.
Innovation Solution
A bearing assembly design featuring a housing with an annular outer race and a nut configuration that allows easy removal and installation using standard tools, incorporating complementary screw threads and a pin system to prevent rotation, along with a cord for securing components, ensuring structural integrity and ease of maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If conventional bearing assembly design is used, then structural integrity for high-load applications is achieved, but maintenance requires specialized equipment and is time-consuming
Solution Approach 1:
The bearing assembly is divided into separable components: the outer race with flange, the nut with internal threads, and the bearing itself. This segmentation allows the bearing to be easily removed by detaching the nut and flange, eliminating the need for specialized pressing equipment while maintaining structural integrity during operation.
Solution Approach 2:
The fastening function is extracted from the traditional press-fit bearing design and implemented through a separate nut and flange system. This allows the bearing to be independently removed from the housing by simply unscrewing the nut, significantly simplifying maintenance procedures while preserving the load-bearing capability of the assembly.
2Ease of operation
If conventional bearing assembly design is used, then structural integrity is maintained, but removal of bearing requires hydraulic press or chamfer tool
Solution Approach 1:
The flange is pre-formed on the outer race with a countersink feature, and the nut is pre-threaded with complementary internal threads. This preliminary preparation of mating features allows the bearing assembly to be easily disassembled using only standard screwing actions, eliminating the need for specialized removal tools while maintaining manufacturing simplicity through standard machining operations.
3Ease of repair
If bearing assembly allows easy disassembly, then maintenance becomes simpler, but structural integrity may be compromised
Solution Approach 1:
The flange and nut create a localized clamping force at the outer race, concentrating the fastening action where needed without compromising the overall structural integrity of the bearing assembly. The threaded connection provides sufficient holding strength for high-load applications while allowing easy maintenance when required.
Data Source
AI summary
A bearing assembly includes a housing, an annular outer race located at least partially within the housing, a bearing located at least partially within the outer race, and a nut configured to be secured to a second axial end of the outer race. The outer race has a central axis and comprises a flange at a first axial end, wherein the flange is configured to prevent movement of the outer race relative to the housing in a first axial direction. The nut is configured to prevent movement of the outer race relative to the housing in a second axial direction, the second axial direction being opposite to the first axial direction.