Differential Seal Lip Geometry for Axle Looseness Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional sealing devices for differential mechanisms fail to prevent the distal end of the side lip from floating away from the deflector when the contact width is increased, leading to potential foreign matter entry into the housing due to excessive looseness of the axle.
Innovation Solution
The sealing device features an annular side lip with a distal end portion and middle portion that are both conical cylindrical in shape, where the distal end portion is bent towards the inner periphery from the middle portion, and the dimensions and physical properties of the elastic body are set to maintain contact pressure with the deflector, ensuring the distal end does not float away even with increased contact width.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the contact width of the side lip is increased to accommodate larger axle looseness, then the sealing device can handle greater axle displacement, but the distal end of the side lip floats away from the deflector, compromising sealing performance
Solution Approach 1:
The side lip is divided into multiple functional segments: a root portion for structural support, a middle portion with conical shape for initial contact, and a distal end portion with different conical shape for maintained contact pressure. This segmentation allows each portion to perform its specific function while collectively accommodating axle looseness without losing contact at the distal end.
Solution Approach 2:
Different portions of the side lip are given different geometric properties - the middle portion has a conical shape with a larger opening angle while the distal end portion has a conical shape with a smaller opening angle. This local differentiation in geometric quality enables the side lip to adapt to varying contact conditions along its length, maintaining effective contact at the distal end even when overall contact width increases.
2Adaptability or versatility
If the side lip is made more flexible to follow axle displacement, then the sealing device adapts to axle movement, but the distal end loses contact pressure with the deflector
Solution Approach 1:
The side lip is designed as a dynamic structure that can elastically deform to accommodate axle displacement while maintaining contact. The conical geometry and material selection allow the side lip to dynamically adjust its shape and contact pressure distribution, ensuring continuous contact with the deflector even during axle movement.
Solution Approach 2:
The side lip incorporates conical curvature in its geometry, with the middle and distal end portions forming conical surfaces with different opening angles. This curved geometry allows the side lip to smoothly follow axle displacement while maintaining optimal contact pressure distribution, preventing floating away at the distal end.
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
This configuration effectively prevents the distal end of the side lip from floating away from the deflector, maintaining sealing performance even with larger looseness of the axle, thereby preventing foreign matter from entering the differential mechanism.
Implementation Method 1
an annular elastic body part formed from an elastic body... The distal end portion of the side lip is bent to an inner periphery side from the middle portion... dimensions and physical properties of the elastic body are set to maintain contact pressure with the deflector
Data Source
AI summary
A sealing device includes an annular reinforcing ring and an elastic body part, and the elastic body part has an annular seal lip, an annular dust lip, and an annular side lip. The side lip extends toward the outer side on an outer periphery side of the dust lip, and includes a distal end portion, a middle portion, and a root portion. The root portion is an annular portion, the middle portion is a portion that is outside of the root portion, and an annular portion that increases in diameter toward an outward side, and the distal end portion is a portion that is outside the middle portion, and an annular portion that increases in diameter toward an outward side. The distal end portion is bent to an inner periphery side from the middle portion.