Self Aligning Bearing Seal Assembly Pivot Misalignment
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Solution Overview
Problem
Conventional self aligning bearing and seal assemblies are limited to angular misalignment of less than 3 degrees, leading to premature failure and reduced lifespan due to misalignment issues, and require precise installation and alignment, which is not always feasible.
Innovation Solution
A self aligning bearing and seal assembly with a pivot assembly that allows up to 20 degrees of angular misalignment, featuring a bearing housing with a pivot unit, shaft sleeve, and seals that maintain alignment and lubrication, eliminating the need for precise installation tools and accommodating various seal and bearing types, lubrication fluids, and orientations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional self aligning bearings are used with fixed seal OD in stationary housing, then bearing can accommodate slight angular movement, but seal ID and seal OD misalignment occurs reducing overall life
Solution Approach 1:
The seal ID is made movable relative to the shaft through a dynamic adjustment mechanism that allows the seal ID to shift position automatically in response to angular misalignment, maintaining continuous contact with the rotating shaft while the seal OD remains fixed in the housing. This dynamic adjustment enables the seal to accommodate angular misalignment without compromising seal integrity.
Solution Approach 2:
An intermediary adjustment mechanism is introduced between the seal ID and the shaft, consisting of an adjustable mounting structure that mediates the relationship between the fixed seal OD and the rotating shaft. This intermediary allows for automatic alignment compensation while maintaining proper sealing contact.
2Use of energy by moving object
If lip type seals are used to maintain lubricating fluid, then lubrication is provided, but uneven contact occurs on seal sides reducing seal integrity
Solution Approach 1:
The seal mounting structure incorporates dynamic adjustment capabilities that allow the seal to automatically equalize contact pressure on both sides of the shaft. The adjustable mechanism responds to misalignment conditions by shifting the seal position, ensuring uniform contact distribution and preventing premature seal failure while maintaining lubrication containment.
Solution Approach 2:
The seal assembly is designed with self-aligning and self-adjusting features that automatically compensate for misalignment without external intervention. The seal mounting structure includes automatic adjustment mechanisms that equalize contact pressure distribution, allowing the seal to maintain integrity and perform its lubrication containment function reliably.
3Reliability
If mechanical type seals are used with rotating sealing element fixed to shaft, then sealing is provided, but premature failure occurs due to misalignment
Solution Approach 1:
The mechanical seal ID mounting is made dynamically adjustable rather than fixed, allowing the seal ID to automatically compensate for angular misalignment between the shaft and housing. This dynamic adjustment maintains proper sealing face alignment and contact, preventing premature seal failure and extending seal operational life.
Solution Approach 2:
The seal mounting structure incorporates adjustable parameters that allow automatic adaptation to misalignment conditions. By changing the positional parameters of the seal ID relative to the shaft through the adjustment mechanism, the seal maintains optimal alignment and contact pressure, extending its service life while maintaining reliable sealing.
4Reliability
If precise alignment and installation are required for bearing and seal assemblies, then seal integrity is maintained, but installation complexity and difficulty increase
Solution Approach 1:
The seal assembly incorporates self-aligning and self-adjusting features that automatically compensate for installation misalignment. The adjustable mounting structure for the seal ID enables automatic alignment compensation during operation, eliminating the need for precise pre-alignment during installation and significantly reducing installation complexity while maintaining seal integrity.
Solution Approach 2:
An intermediary adjustment mechanism is introduced between the seal components and the housing/shaft assembly, serving as a mediator that absorbs installation alignment errors. This adjustment mechanism allows for easy installation without precision alignment tools while maintaining proper seal contact and integrity during operation.
Data Source
AI summary
A self aligning bearing and seal assembly including a bearing housing operable to mount to a surface, a bearing unit seated within the bearing housing and having an outer race, an inner race, and at least one ball intermediate the outer and inner race. The self aligning bearing and seal assembly also includes a pivot assembly having a shaft sleeve operable for receiving and maintaining a rotatable shaft and being disposed in the bearing housing and in operational contact with the inner race of the bearing unit. The pivot assembly allows for a degree of angular misalignment between the surface and the shaft greater than three degrees.