Inner Wheel Drive Sealing Structure for Shorter Axial Packaging
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Solution Overview
Problem
Existing sealing structures for inner wheel drive systems require a significant axial length to accommodate the relative displacement between the rotating shaft and housing, which limits their applicability in narrow spaces.
Innovation Solution
A sealing structure with a dustproof member arranged on an axial outer side of the radial clearance, where the dustproof member has a first end fixed to the first component and a second end extending radially to cover the clearance, reducing the axial size required for mounting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the dust cover and oil seal are both arranged at the same-diameter positions (in the radial clearance), then the sealing function is achieved, but the axial length of the inner wheel drive system becomes longer
Solution Approach 1:
The dust cover is repositioned from the radial clearance to the axial outer side of the sealing member, changing its spatial arrangement from a radial configuration to an axial configuration. This dimensional repositioning allows the dust cover to overlap with the second component in the axial direction while covering the radial clearance, thereby reducing the axial length requirement without compromising sealing effectiveness
2Length of moving object
If the dust cover is arranged at the axial outer side to reduce axial length, then the axial size is reduced, but the fitting stability between the dust cover and rotating shaft may be compromised
Solution Approach 1:
By moving the dust cover to the axial outer side and having it overlap with the second component in the axial direction, the design maintains fitting stability through a different spatial configuration. The dust cover's second end partially overlaps with the second component axially, providing sufficient contact area for stable fitting while reducing the overall axial size of the assembly
3Reliability
If the dust cover and sealing lip are spaced apart to accommodate axial displacement, then the sealing reliability is maintained, but the axial length requirement increases
Solution Approach 1:
The dust cover is positioned at the axial outer side of the sealing member, creating a spatial separation that accommodates axial displacement between the rotating shaft and housing. This axial positioning allows the dust cover to maintain adequate spacing from the sealing lip while not increasing the overall axial length, as the dust cover overlaps with the second component in the axial direction
Data Source
AI summary
A sealing structure, an inner wheel drive system and a method for assembling a dustproof member in a sealing structure. The sealing structure is used for sealing a radial clearance between a first component and a second component, and comprises a sealing member and a dustproof member, wherein the sealing member is sealed in the radial clearance, the dustproof member is located on an axial outer side of the sealing member, a first end of the dustproof member is fixed on the first component, an opposite second end extends in a radial direction so as to cover the radial clearance, and the second end and the second component are spaced apart and partially overlap with each other in an axial direction. Since the dustproof member is not arranged in the radial clearance, the axial size of the radial clearance is reduced, and axial sizes of the first component and the second component are also accordingly reduced. The sealing structure is especially suitable for the inner wheel drive system, is helpful for reducing the axial size of the inner wheel drive system, and improves the applicability of the inner wheel drive system.