Bicycle Brake Pad Assembly With Barrier-Coated Spreader Spring
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Solution Overview
Problem
Bicycle disc brake pad assemblies experience noise generation due to direct metal-to-metal contact between the spreader spring and the pin, as well as between the brake pads and the pin, which affects braking performance.
Innovation Solution
A spreader spring with a barrier layer coating on its side walls and apertures to prevent direct contact, combined with a method of assembling the brake pad assembly where the spreader spring, brake pads, and backing plates are fixed together as a one-piece unit, allowing for a single dipping step to apply the barrier layer and reduce noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If the spreader spring and brake pads are made as separate metal components, then the assembly is simple and easy to manufacture, but noise is generated due to direct metal-to-metal contact with the pin
Solution Approach 1:
A barrier layer is introduced as an intermediary material between the metal spreader spring/brake pads and the pin. This barrier layer prevents direct metal-to-metal contact, thereby eliminating noise generation while maintaining the simple metal component structure. The barrier layer acts as a mediator that allows the components to function together without harmful interaction.
Solution Approach 2:
The spreader spring and brake pads are transformed from pure metal components into composite structures by adding a barrier layer coating. This creates a composite material system where the metal provides structural function and the barrier layer provides noise reduction function, resolving the contradiction between simplicity and noise elimination.
2Ease of manufacture
If the barrier layer is applied to each component separately, then the coating coverage is complete, but the assembly process becomes complex and time-consuming
Solution Approach 1:
The barrier layer application process for multiple components (spreader spring, brake pads, backing plates) is merged into a single simultaneous operation. By combining these separate coating operations into one unified process, the assembly becomes easier and faster while still achieving complete coating coverage on all necessary surfaces.
Solution Approach 2:
The barrier layer is applied to all components before final assembly, allowing for a single dipping operation that coats multiple parts simultaneously. This preliminary action ensures complete coverage is achieved before the components are put together, simplifying the overall manufacturing process.
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 barrier layer effectively mitigates noise during braking by preventing metal-to-metal contact, enhancing braking efficiency and ease of assembly by integrating the spreader spring and brake pads into a single unit.
Implementation Method 1
a barrier layer lining at least the first side wall and the second side wall to prevent contact between the first side wall and the pin and the second side wall and the pin, to mitigate noise generated by sliding of the first leaf and second leaf along the pin
Data Source
AI summary
A brake pad assembly for a bicycle includes a first brake pad, a second brake pad, and a spreader spring. The first brake pad has a first backing plate with a first rotor facing surface, and a first friction pad secured to the rotor facing surface. The second brake pad has a second backing plate with a second rotor facing surface, and a second friction pad secured to the second rotor facing surface and facing the first friction pad. The spreader spring has a first leaf that is fixed to the first brake pad and a second leaf that is fixed to the second brake pad. At least a portion of the first leaf is positioned between the first rotor facing surface and the first friction pad, and at least a portion of the second leaf is positioned between the second rotor facing surface and the second friction pad.