Slinger Adhesive Removal for Rotary Torque Reduction
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Solution Overview
Problem
Sealing devices with tone wheels or seal lips stuck to slingers face challenges in applying adhesive agents evenly, leading to increased rotary torque due to adhesive layers on treated surfaces, and existing solutions are not suitable for slingers fixed to rotary side members.
Innovation Solution
A sealing device design where an adhesive layer is applied to the entire surface of the slinger, including the contacting surface, and then partially removed using methods like laser treatment, shot peening, or chemical removal, ensuring the adhesive layer is not present on the slidably contacting surface, and optionally using a surface roughening treatment to reduce friction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If an adhesive layer is applied to the entire surface of the slinger including the contacting surface, then the fixing member can be strongly adhered, but the friction resistance and rotary torque increase
Solution Approach 1:
The slinger surface is segmented into two functional zones: a contacting surface free of adhesive layer for low friction, and a non-contacting surface with adhesive layer for strong fixation of the fixing member. This spatial segmentation resolves the contradiction by allowing both strong adhesion and low friction in different areas.
Solution Approach 2:
Different surface qualities are applied to different locations of the slinger: the contacting surface has no adhesive layer (smooth, low friction) while other surfaces have adhesive layers (strong adhesion). This local differentiation allows the system to simultaneously achieve low friction where needed and strong bonding where required.
2Force
If the slidably contacting surface is treated with surface treatment, then the frictional coefficient is reduced, but adhesive layer formation deteriorates the reduction effect of rotary torque
Solution Approach 1:
The adhesive layer is applied to the entire surface first, then selectively removed from the contacting surface. This preliminary application followed by selective removal ensures that the contacting surface remains free of adhesive while other surfaces have adequate adhesion, preventing the adhesive from deteriorating the friction reduction effect.
Solution Approach 2:
The adhesive layer is extracted or removed from the contacting surface after initial application, leaving it free of adhesive while maintaining adhesive layers on other surfaces. This extraction eliminates the harmful effect of adhesive on friction while preserving the beneficial adhesion elsewhere.
3Strength
If adhesive agent is applied all over the sticking surface, then strong adhesion is achieved, but it is difficult to apply to every end depending on shape
Solution Approach 1:
Instead of attempting to apply adhesive only to difficult-to-reach areas (partial action), the adhesive is applied excessively to the entire surface, and then the excess is selectively removed from the contacting surface. This approach simplifies the application process while achieving the desired adhesive distribution.
Solution Approach 2:
The slinger is entirely dipped in the adhesive agent prepared in a vessel, creating a complete adhesive coating that copies the entire surface geometry, ensuring uniform adhesive distribution including hard-to-reach areas without manual application challenges.
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 approach reduces friction resistance and rotary torque, enhancing fuel efficiency and sealing performance by preventing adhesive layer formation on the slidably contacting surface, allowing for effective adhesion of the fixing member and improved sealing without edge formation.
Implementation Method 1
an adhesive layer is formed on its whole surface including a contacting side surface where the seal lip contacts by applying adhesive agent thereon
Implementation Method 2
the adhesive layer is partially removed only in the contacting side surface
Data Source
AI summary
A sealing device which comprises a slinger fixedly fitted to the rotary side member, a core member fixedly fitted to the stationary side member, and an elastic sealing member fixed to the core member and having a seal lip which elastically and slidably contacts the slinger. The slinger comprises a fitting cylindrical portion to be fitted into the rotary side member, a brim portion extending its radial direction at one end of its outside relative to a sealed portion of the fitting cylindrical portion, and a rotary side fixing member fixed to the brim portion. Further, the slinger is made in such a manner that an adhesive layer is formed on its whole surface including a contacting side surface where the seal lip contacts by applying adhesive agent thereon, then the fixing member is integrally fixed thereto, thereafter the adhesive layer is partially removed only in the contacting side surface.