Dynamically Aligning Radial Insert Ball Bearing
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Solution Overview
Problem
Self-aligning bearings, such as spherical roller bearings, fail to maintain lubrication and provide adequate sealing for dynamic misalignment, especially when misalignment exceeds half a degree, leading to contamination and complex mounting issues.
Innovation Solution
A dynamically aligning, maintenance-free radial insert ball bearing with an inner and outer ring, an enclosure ring with a partial spherical contour, and seals that form a lubricant reservoir, allowing for axial tilting and maintaining sealing through flexible seals and a pre-loaded circular seal spring, enabling dynamic misalignment while protecting the bearing from contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If standard seals are used in self-aligning bearings, then the bearing structure is simple, but the seals fail to maintain lubrication during dynamic misalignment exceeding half a degree
Solution Approach 1:
The seal is divided into multiple independent sealing lips (first sealing lip, second sealing lip, third sealing lip) that can move and deform independently. Each sealing lip contacts a different surface (inner ring, outer ring, enclosure ring), creating multiple sealing zones that work together to maintain lubrication during dynamic misalignment.
Solution Approach 2:
The seal incorporates a resilient material that allows the sealing lips to dynamically adjust their position and contact pressure in response to misalignment movements. The seal can deform elastically to maintain contact with rotating surfaces even when the bearing experiences angular or radial misalignment up to five degrees.
2Adaptability or versatility
If self-aligning bearings permit dynamic misalignment movement, then adaptability to misalignment is improved, but lubrication is not maintained and contamination occurs
Solution Approach 1:
The seal is constructed from resilient material that forms a flexible barrier between the lubricated bearing interior and the external environment. This flexible membrane can deform to accommodate misalignment movements while maintaining its sealing function, preventing contamination from entering the bearing during dynamic operation.
Solution Approach 2:
The single seal structure performs multiple functions simultaneously: it seals against contamination, retains lubrication, and accommodates dynamic misalignment movements. The multi-lip design allows different portions of the seal to interact with different components (inner ring, outer ring, enclosure ring), providing comprehensive protection while allowing the bearing to adapt to various misalignment conditions.
3Adaptability or versatility
If spherical roller bearings are used for self-alignment, then misalignment correction is achieved, but the bearing requires maintenance and is not maintenance-free
Solution Approach 1:
The seal is pre-loaded against the inner ring, outer ring, and enclosure ring surfaces, creating initial contact pressure that ensures immediate sealing effectiveness. This pre-loading arrangement ensures that lubrication is retained and contamination is prevented from the start of operation, enabling maintenance-free operation throughout the bearing's service life even during dynamic misalignment.
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 allows for a wider range of dynamic misalignment, enhances lubrication, and provides longer bearing life by maintaining sealing and protecting the bearing from contamination, even during significant misalignment, surpassing the limitations of standard self-aligning bearings.
Implementation Method 1
a circular seal spring that is pre-loaded radially inwardly biases the at least one sealing lip against the inner ring
Implementation Method 2
The pocket is formed with a flexible seal material and allows radially inward and outward expansion and contraction of the outer seals to maintain contact between the at least one sealing lip and the inner ring during axial tilting
Implementation Method 3
define a lubricant reservoir for the sliding contact of the partial spherical contour in the complementary shaped contour in the inner surface of the enclosure ring
Data Source
AI summary
A dynamically aligning, maintenance-free, radial insert ball bearing is provided, including an inner ring and an outer ring. An outer surface of the outer ring has a partial spherical contour. An enclosure ring is located about the outer ring and has an inner surface with a complementary shaped contour to the partial spherical contour, allowing tilting of the outer ring relative to the enclosure ring via sliding contact. Rolling elements are located between the inner and outer rings. First and second inner seals are located on opposing sides of the rolling elements and extend between the inner and outer rings. Outer seals are located on opposing sides of the rolling elements axially outward of the respective first and second inner seals and extend between the enclosure ring and the inner ring to define a lubricant reservoir for the sliding contact of the partial spherical contour in the complementary shaped contour.