Integral Rib Sealing Assembly to Prevent Shaft Seal Pinching
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Solution Overview
Problem
Conventional sealing members for shafts are prone to damage during assembly due to floating and pinching, leading to reduced durability and increased warranty claims, resulting in higher costs.
Innovation Solution
A sealing assembly with integrally formed ribs and a seal casing design that includes axially and radially extending sealing lips, retention ribs, and a spring groove to securely engage with the shaft and housing, preventing pinching and enhancing retention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If sealing members are allowed to freely float on the shaft outer surface during assembly, then assembly ease is improved, but sealing member durability deteriorates due to pinching and squeezing damage
Solution Approach 1:
The sealing member is pre-positioned and retained on the shaft using retention ribs that engage with grooves in the shaft surface. This preliminary positioning action prevents the sealing member from freely floating during assembly, thereby preventing pinching and squeezing damage while maintaining ease of assembly through the self-retaining design
2Reliability
If sealing members are retained securely on the shaft, then sealing member durability is improved, but device complexity increases due to additional retention structures
Solution Approach 1:
The retention ribs are integrally formed as part of the sealing member itself, merging the sealing function and retention function into a single component. This eliminates the need for separate retention structures, thereby improving sealing member durability through secure retention while avoiding increased device complexity
Solution Approach 2:
The sealing member retains itself on the shaft through its own integrally formed retention ribs that engage with grooves in the shaft. This self-service mechanism eliminates the need for external retention structures, improving durability without adding complexity to the overall system
Data Source
AI summary
A sealing assembly having a seal casing. A decreased diameter portion extends inboard from at least a portion of a first end portion of the substantially cylindrical portion and an axially extending portion extends inboard from at least a portion of a second end portion of the decreased diameter portion of the casing. One or more first sealing portions having one or more static sealing ribs extend from at least a portion of an outer surface of the substantially cylindrical portion. One or more second sealing portions are integrally connected to at least a portion of the decreased diameter portion, the axially extending portion and/or an inner surface of the substantially cylindrical portion. The one or more second sealing portions have a retaining member sealing surface with one or more sealing member retention ribs extending from at least a portion of an outer surface of the retaining member sealing surface.