Bearing Seal Protrusion Prevents Lip Interference
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Solution Overview
Problem
The existing bearing sealing devices face challenges in maintaining dimensional accuracy and yield rate during production, leading to interference between seal lips when stacked, which affects assembly and seal functionality due to deep bending processing and dispersion in fitting strength values.
Innovation Solution
A bearing sealing device with a core member and elastic seal lip member, featuring a protrusion portion that abuts adjacent devices to prevent contact and deformation, maintaining fitting accuracy and flexibility in design, while reducing the need for deep bending processing and enhancing the forming region of the axial lip.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the inner flange portion is formed with deep bending processing to create a curve portion that folds back, then the seal lip does not contact adjacent sealing devices when stacked, but the dimensional accuracy of the cylindrical portion deteriorates and the yield rate decreases
Solution Approach 1:
The invention divides the core member into functionally independent parts: the cylindrical portion for fitting to the outer ring and the inner flange portion with curve portion for preventing seal lip contact. This segmentation allows each part to be optimized independently - the cylindrical portion maintains high dimensional accuracy for precise fitting, while the curve portion provides the necessary spacing function without compromising the other.
Solution Approach 2:
The invention applies different structural characteristics to different regions of the core member. The cylindrical portion is designed with high precision dimensional tolerances for accurate fitting to the outer ring, while the inner flange portion incorporates deep bending to form a curve portion that creates adequate spacing. This local differentiation resolves the contradiction by ensuring each region has the quality needed for its specific function.
2Reliability
If the inner flange portion is formed with deep bending processing, then the seal lip spacing is improved, but the production complexity and difficulty increase
Solution Approach 1:
By segmenting the core member into distinct functional portions, the invention allows the curve portion to be designed specifically for the spacing function while keeping the cylindrical portion simple for manufacturing. This segmentation enables the deep bending to be concentrated in a localized region rather than affecting the entire component, thereby reducing overall production complexity.
Solution Approach 2:
The curve portion is designed in advance with predetermined geometry that ensures adequate spacing between stacked sealing devices. This preliminary design of the inner flange portion's bent structure allows manufacturers to plan the deep bending process upfront, optimizing tooling and production workflows, thereby reducing actual production difficulty and improving yield rate.
3Reliability
If the curve portion is formed to largely overlap the cylindrical portion in diametrical direction, then the seal lip is located in the space portion without contact, but the fitting accuracy of the cylindrical portion to the outer ring deteriorates
Solution Approach 1:
The invention segments the core member's functions spatially: the cylindrical portion handles the fitting function with high precision requirements, while the inner flange portion with its curve portion handles the spacing function. This segmentation allows the curve portion to overlap the cylindrical portion in the diametrical direction without compromising fitting accuracy, as each portion independently performs its designated function.
Solution Approach 2:
The invention employs asymmetric design where the inner flange portion extends and bends to form a curve portion that creates an asymmetric structure. This asymmetric configuration allows the curve portion to overlap the cylindrical portion diametrically while maintaining the cylindrical portion's dimensional accuracy for precise fitting to the outer ring, as the asymmetry is localized to the flange region rather than the cylindrical fitting region.
4Reliability
If the inner flange portion is formed with deep bending to create space, then the seal lip non-contact condition is achieved, but the dispersion of fitting strength values increases
Solution Approach 1:
By segmenting the core member into the cylindrical portion and the inner flange portion with curve portion, the invention isolates the deep bending process to a specific region. This segmentation ensures that the fitting interface between the cylindrical portion and outer ring is not affected by the bending-induced dimensional variations, thereby reducing dispersion of fitting strength values while still achieving the seal lip spacing function.
Solution Approach 2:
The invention applies local quality by concentrating the deep bending processing in the inner flange portion's curve region, while maintaining high dimensional quality in the cylindrical portion's fitting region. This localized approach ensures that the bending operations do not propagate dimensional variations to the critical fitting interface, thereby reducing dispersion of fitting strength values while achieving adequate seal lip spacing.
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
Prevents mutual interference between seal lips during stacking, maintains fitting accuracy, and improves the yield rate by allowing for easier formation of the axial lip, ensuring strong fitting force and reduced assembly issues.
Implementation Method 1
an elastic member (a seal lip member) fixed to the core member and having a plurality of seal lips elastically contacting a flange face including a hub wheel and a rising face of the hub flange
Data Source
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AI summary
A bearing sealing device including a core member and a seal lip member which is made of elastic material, the core member having a cylindrical portion fitted to an inner diametrical portion of an outer ring of a bearing device, an outer flange portion which extends into an outer diametrical direction from one end of the cylindrical portion on an opposite side to a bearing space side, and an inner flange portion which extends into an inner diametrical direction from another end of the cylindrical portion on a bearing space side, the seal lip member having an axial lip fixed to the core member and projecting into the opposite side to the bearing space side from the inner flange portion. The bearing sealing device is characterized in that the inner flange portion of the core member extends so as to bend into an inner diametrical side through a curve portion from the other end of the cylindrical portion, the curve portion is provided with a protrusion portion made of elastic material and extending into the bearing space side, the protrusion portion functions in such a manner that, when a plurality of bearing sealing devices are concentrically stacked in an axial direction, the protrusion portion abuts on an adjacent bearing sealing device and the bearing sealing device and the adjacent bearing sealing device do not contact each other at a region other than an abutting region of the adjacent bearing sealing device.