Disc Brake Guide Pin Mounting With Anti-Rotation Interference Fit
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Solution Overview
Problem
Heavy vehicle disc brakes experience guide bolt loosening due to rotational torque, which previous solutions have inadequately addressed by focusing on symptoms rather than the root cause of sleeve rotation-induced bolt loosening.
Innovation Solution
A guide pin mounting system with a polygonal cross-sectional profile for the guide pin and a mismatched receiving portion in the brake carrier, forming an interference fit to inhibit rotation and slippage, thereby reducing the risk of bolt loosening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a smooth outer guide sleeve is used for the guide pin, then the brake caliper can slide smoothly along the guide pin, but the guide sleeve rotates under rotational torque causing the guide bolt to loosen
Solution Approach 1:
The guide pin mounting portion is given an asymmetric polygonal cross-sectional profile instead of a symmetric circular profile. This asymmetric shape creates interference engagement with the receiving portion that prevents rotation while still allowing the brake caliper to slide smoothly along the guide pin during normal operation.
Solution Approach 2:
The patent transitions from a circular (curved) cross-sectional profile to a polygonal (flat-faced) cross-sectional profile for the mounting portion. This geometric change enables the formation of mating edge regions that create interference engagement, preventing the rotational movement that causes bolt loosening while maintaining sliding functionality.
2Reliability
If lock patches are used to prevent guide bolt loosening, then the bolt retention is improved, but the solution only addresses the symptom rather than the root cause of rotation
Solution Approach 1:
The patent removes the auxiliary lock patch component from the mounting structure and instead integrates the anti-rotation function directly into the guide pin mounting portion through its polygonal cross-sectional profile. This eliminates the need for separate locking components while maintaining bolt retention reliability.
Solution Approach 2:
The polygonal mounting portion structure is self-containing and self-sufficient, providing both the sliding guide function and the anti-rotation locking function through its own geometric features without requiring external locking components or additional assembly steps.
3Reliability
If a polygonal cross-sectional profile is used for the mounting portion, then rotation and slippage are inhibited through interference fit, but the manufacturing precision requirements increase
Solution Approach 1:
The polygonal interference engagement is localized to specific mating edge regions of the mounting portion and receiving portion, rather than requiring precision across the entire circumference. This localized approach concentrates the precision requirements at specific contact points, making manufacturing more feasible while maintaining effective anti-rotation capability.
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
The interference fit effectively counteracts rotational torque, preventing guide pin slippage and bolt loosening, enhancing the stability and reliability of the disc brake system.
Implementation Method 1
The interference fit is able to substantially inhibit rotation and slippage of the guide pin within the brake carrier. The mounting is thereby able to counter rotational torque acting on the guide pin
Implementation Method 2
at least one mating region of the mounting portion abuts the receiving portion, forming an interference fit between the guide pin and the brake carrier
Data Source
AI summary
A mounting for a guide pin of a disc brake and method of mounting. A mounting portion of a guide pin may have a first polygonal cross-sectional profile. A receiving portion of a brake carrier may receive the mounting portion and may have cross-sectional profile that is different than the first polygonal cross-sectional profile.