Spherical Plain Bearing Boot Seal with Sliding Ring
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Solution Overview
Problem
Spherical plain bearings with traditional boot seals suffer from plastic deformation due to repeated stretching, compromising the seal's effectiveness and reducing the bearing's lifespan.
Innovation Solution
A spherical plain bearing assembly featuring a rotatable boot seal with sliding rings that eliminate frictional forces, preventing excessive stretching of the seal material by using annular grooves and sliding rings to maintain the seal's integrity during rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the boot seal edges are fixedly retained in grooves on the ball and outer race, then the boot seal provides effective sealing, but the boot seal material undergoes plastic deformation due to repeated stretching
Solution Approach 1:
The boot seal is divided into two functional segments: a fixed retention portion in the groove that maintains sealing position, and a sliding portion that moves with the ball rotation. This segmentation allows the seal to maintain its sealing function while avoiding continuous stretching of the entire seal material.
Solution Approach 2:
A sliding ring is introduced as an intermediary component between the boot seal and the ball. The sliding ring rotates with the ball while the boot seal remains relatively stationary, mediating the rotational movement and eliminating direct stretching of the seal material.
2Reliability
If the boot seal is stretched across the rotating interface, then the boot seal seals the sliding interface, but the boot seal material experiences repeated stretching and plastic deformation
Solution Approach 1:
The boot seal system transitions from a static stretched configuration to a dynamic system where the sliding ring rotates with the ball. This dynamic arrangement allows the seal to adapt to rotation without undergoing repeated elastic-plastic deformation cycles, extending its service life.
Solution Approach 2:
The sliding ring automatically rotates with the ball during normal operation, providing continuous sealing without requiring the boot seal material to stretch and recover repeatedly. The system self-adjusts to the rotational motion through the sliding mechanism.
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 effectively inhibits the ingress of contaminants and extends the bearing's lifespan by reducing material stress and maintaining the seal's effectiveness over time.
Implementation Method 1
A spherical plain bearing assembly featuring a rotatable boot seal with sliding rings that eliminate frictional forces
Data Source
Figure 1~2
Figure 3~5
Figure 6
AI summary
A spherical plain bearing assembly comprises a ball (14) and an outer race (12) slidably and rotatably engaged with each other, a ring (50, 150) slidably located in one of the ball (14) and the outer race (12), and a seal (30) extending between the ring and the other of the ball and the outer race. The ball (14) has a first groove (40) located in an outer surface thereof, and the outer race (12) has an outer surface having a second groove (42) located therein, the first and second grooves being concentrically arranged. The ring (50, 150) is slidably located in either the first (40) or second (42) groove. The seal (30) has first and second edges, the first edge being captured in the ring (50, 150) and the second edge being captured in the first (40) or second (42) groove.