Flexible Spherical Bearing Maintaining Constant Torque
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Solution Overview
Problem
Spherical plain bearings often experience varying torque levels during sliding, rotating, or tilting motions due to changes in contact pressure between the ball and the outer race, which can lead to instability and reduced operational lifespan.
Innovation Solution
A spherical plain bearing assembly featuring a flexible ball with a radial spring design and a complementary outer race, where the ball's geometry allows for resilient expansion to maintain constant pressure and torque, utilizing a slit for radial expansion and anchoring points to prevent axial sliding, and apertures for positional stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional rigid ball is used in the spherical plain bearing, then the structure is simple and manufacturing is easy, but the contact pressure varies during operation causing varying torque levels
Solution Approach 1:
The ball is designed with a flexible structure containing a spring mechanism that allows it to dynamically adjust its radial dimensions during operation. This dynamic adaptation enables the ball to maintain constant contact pressure with the outer race despite variations in loading conditions, thereby ensuring substantially constant torque levels while replacing the static rigid ball structure.
Solution Approach 2:
The flexible ball incorporates a spring mechanism that changes the physical parameters of the ball, specifically its radial dimension. By allowing the radial dimension to vary in response to loading conditions, the ball maintains optimal contact pressure with the outer race, resolving the contradiction between structural simplicity and torque consistency.
2Reliability
If the ball is made flexible with expansion capability, then constant pressure can be maintained, but the manufacturing complexity increases
Solution Approach 1:
The ball is segmented into an outer spherical shell and an inner spring mechanism. This segmentation allows the complex flexible functionality to be achieved by combining simpler components - a rigid spherical outer surface for engagement and a spring mechanism for radial adjustment - making the overall manufacturing more feasible compared to creating a monolithic flexible structure.
Solution Approach 2:
The ball employs a composite structure combining rigid material for the spherical outer surface (which requires high precision and strength) with a spring mechanism (which can be made from elastic materials). This composite approach allows each component to be manufactured using appropriate processes for its specific requirements, then assembled together, reducing overall manufacturing complexity.
3Reliability
If the ball expands radially to maintain constant pressure, then torque remains constant, but the ball may slide axially without proper constraints
Solution Approach 1:
The axial constraint function is merged with the ball structure itself through the integration of the spring mechanism and axial constraint features. The spring mechanism not only enables radial expansion for pressure maintenance but also incorporates axial constraint capabilities, combining multiple functions into a single integrated component that prevents axial sliding while maintaining torque stability.
Solution Approach 2:
The spring mechanism acts as an intermediary between the rigid spherical outer surface and the axial constraint features. It transmits and balances the forces, allowing the ball to expand radially for constant pressure maintenance while the spring's structural design simultaneously provides axial constraint, mediating between the conflicting requirements of radial flexibility and axial stability.
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 solution ensures a substantially constant torque is maintained during operation, enhancing the bearing's stability and longevity by maintaining consistent pressure and preventing axial sliding, as demonstrated through testing under high cycles of rotational and swiveling motion.
Implementation Method 1
the flexible ball is resiliently expandable in a radial direction defining a second diameter which is greater than the first diameter
Implementation Method 2
A spherical plain bearing assembly comprising a flexible ball comprising a radial spring ball
Data Source
AI summary
A spherical plain bearing assembly (300) includes a flexible cylindrical inner member (312A) having a spherical outer surface (315), an annular inner surface (325), a first diameter D1, and a bore extending therethrough. A slit (330) extends axially through the inner member (312A) whereby it resiliently expands in a radial direction defining a second diameter D2 greater than the first diameter D1. The inner member (312A) is positioned within an outer member (314) such that the spherical outer surface (315) of the inner member (312A) slidably and rotatably engages an inner engagement surface (316) of the outer member (314) wherein a substantially constant torque is maintained.