Stabilizer Bar Coating Surface Treatment for Rubber Bush Adhesion
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Solution Overview
Problem
Conventional methods for bonding rubber bushes to stabilizer bars often result in adhesive surface peeling, leading to reduced adhesive strength and potential rust due to uneven coating film thickness and exposure of metal surfaces, especially when using primers or abrasive techniques.
Innovation Solution
A method involving the application of adhesive only to the rubber member, with the bar member heated to cure the adhesive, and a surface treatment that reduces the contact angle of the coating film to improve adhesion and prevent peeling, while maintaining a uniform coating thickness to prevent rust.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the adhesive surface is roughened with an abrasive member or laser beam to improve adhesion, then adhesive strength is improved, but coating film thickness becomes uneven and metal surface is exposed causing rust
Solution Approach 1:
The invention changes the surface energy parameters of the coating film by controlling its composition and properties. The coating film is designed to have a specific surface energy range (20-40 mN/m) that enables adequate adhesive bonding without requiring mechanical roughening, thus preventing coating film damage and metal surface exposure while maintaining rust prevention reliability.
Solution Approach 2:
The coating film itself acts as an intermediary that provides both corrosion protection and adequate adhesion. By optimizing the coating film's surface energy and composition, it serves as a mediating layer between the metal substrate and adhesive, eliminating the need for aggressive surface treatment that would compromise the coating's integrity.
2Strength
If a primer is applied between the stabilizer bar and rubber bush to increase adhesive strength, then adhesive strength is improved, but adhesive surface peeling still occurs depending on coating film and primer conditions
Solution Approach 1:
The invention extracts and eliminates the primer layer from the bonding system. By optimizing the coating film's surface energy and composition, the system achieves adequate adhesion without the intermediate primer layer, thereby removing the source of peeling problems that occur at the coating-primer or primer-adhesive interfaces.
Solution Approach 2:
The invention uses a composite coating system where the coating film is specifically formulated with controlled surface energy properties. This composite approach combines corrosion protection with optimized adhesion characteristics, replacing the multi-layer primer-coating system with a single optimized coating layer that prevents peeling.
3Reliability
If the contact angle of the coating film is made large to improve water resistance, then water resistance is improved, but adhesive strength decreases making peeling more likely
Solution Approach 1:
The invention optimizes the contact angle parameter to a specific range (65°-110°) that balances water resistance and adhesive strength. By controlling the coating film's surface energy and composition, this parameter optimization enables the coating to provide adequate hydrophobicity for water resistance while maintaining sufficient surface energy for strong adhesive bonding.
Solution Approach 2:
The invention applies different surface energy characteristics to different functional requirements of the coating film. The coating is formulated to exhibit hydrophobic properties (higher contact angle) for water resistance while maintaining adequate surface energy for adhesion, achieving local optimization of both water resistance and bonding strength within the same coating layer.
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 method ensures a strong, durable bond between the rubber bush and stabilizer bar, preventing peeling and rust, and provides excellent water resistance with a contact angle exceeding 65°, enhancing the vehicle spring's performance and longevity.
Implementation Method 1
after heating the region including the attachment part of the bar member by, for example, high-frequency induction heating, the adhesive is cured by the heat of the bar member
Data Source
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AI summary
A stabilizer (10) disposed on a suspension mechanism part of a vehicle comprises a stabilizer bar (20) and a rubber bush (60). The stabilizer bar (20) includes a bar body (40) made of a steel material, and a coating film (41) coating the bar body (40). The coating film (41) is formed on the surface of the bar body (40) by using a resin having a water contact angle of more than 65 degrees. By performing surface treatment for reducing the contact angle of the coating film (41) present on an attachment part (20a), the contact angle of the attachment part (20a) is changed to 65 degrees or less. A pre-cured liquid adhesive agent (70) is applied to an inner surface (adhesion surface) (64, 65) of the rubber bush (60). After a region including the attachment part (20a) of the stabilizer bar (20) is heated by high-frequency induction heating or the like, the rubber bush (60) is overlaid on the attachment part (20a). Subsequently, the adhesive agent (70) is cured in a state where the rubber bush (60) is pressed.