Threaded Bearing Assembly for Easier Spherical Bearing Replacement
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Solution Overview
Problem
The maintenance of bearing assemblies in helicopter main rotor actuators is cumbersome due to the need for specialized equipment to access and replace worn-out spherical bearings, making the process time-consuming and costly.
Innovation Solution
A bearing assembly design featuring a static housing with an outer race and nut secured by complementary screw threads, a pin to prevent rotation, and a cord for securing components, allowing for easy disassembly and reassembly using standard tools.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If conventional bearing assemblies are used with press-fit outer races, then structural integrity for high-load applications is maintained, but maintenance requires specialized equipment and is time-consuming
Solution Approach 1:
The bearing assembly is segmented into distinct components: the outer race with integrated screw threads, the bearing, and the housing. This segmentation allows the outer race to be independently removed by unscrewing, enabling bearing replacement without specialized press equipment while maintaining the structural integrity of each component.
Solution Approach 2:
The screw threads act as an intermediary mechanism between the outer race and the housing. Instead of requiring direct press-fit force to remove the outer race, the threaded interface provides a mechanical mediator that converts rotational motion into linear displacement, allowing easy removal with standard tools while maintaining secure attachment during operation.
2Reliability
If bearing assemblies require hydraulic presses for disassembly, then secure attachment is achieved, but maintenance time and costs increase
Solution Approach 1:
The attachment mechanism transitions from a static press-fit relationship to a dynamic threaded connection. The screw threads allow the outer race to be securely attached during operation through rotational tightening, then easily detached through rotational loosening, providing both reliability during use and rapid maintenance access.
Solution Approach 2:
The screw threads are pre-formed into the outer race during manufacturing, creating a ready-to-use attachment mechanism before the bearing assembly is installed. This preliminary preparation eliminates the need for specialized equipment during maintenance, as the threaded interface is already prepared for quick assembly and disassembly with standard tools.
3Manufacturing precision
If specialized equipment is used for bearing replacement, then proper installation is ensured, but maintenance costs increase
Solution Approach 1:
The screw thread interface provides a universal attachment mechanism that works with standard hand tools available in most maintenance environments. This multi-functional approach replaces the need for specialized hydraulic press equipment, reducing maintenance costs while maintaining installation precision through the self-aligning nature of threaded connections.
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
Facilitates easier access and replacement of spherical bearings, reducing maintenance time and costs while maintaining structural integrity for high-load applications.
Implementation Method 1
a cord (52) to wrap around the housing (32) and secure the outer race (28) and bearing (26) in place
Implementation Method 2
a pin (54) to prevent rotation of the outer race (28)
Implementation Method 3
an outer race (28) having a hollow interior shaped to complement an outer surface (31) of the spherical bearing (26) with at least a portion of an outer surface (30) of the outer race configured to abut against an inner surface (34) of the housing (32), wherein the housing has an annular slot shaped to receive a flange of the outer race, the outer race having complementary screw threads
Data Source
Figure 1
Figure 2
Figure 3~5
AI summary
There is provided a bearing assembly comprising 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.