Bicycle Disc Brake Rotor Axial Offset Cooling
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Solution Overview
Problem
Bicycle disc brake rotors face challenges in managing heat expansion, leading to interference with adjacent components and reduced cooling efficiency, which affects braking performance and durability.
Innovation Solution
A bicycle disc brake rotor design featuring a friction member and a cooling member with a radially outward cooling body, where the cooling member's inner peripheral edge is offset to prevent interference and enhance cooling surface area, utilizing materials with high thermal conductivity and incorporating air intakes for improved airflow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the cooling member is designed with a large cooling surface area to improve cooling efficiency, then cooling efficiency is improved, but the cooling member expands more due to heat and interferes with adjacent components
Solution Approach 1:
The second inner peripheral edge is offset from the radially outer part in the axial direction, creating a dimensional separation that allows the cooling member to expand axially without interfering with adjacent components in the radial direction. This axial offset provides expansion space while maintaining the beneficial large cooling surface area.
Solution Approach 2:
The patent changes the geometric parameters of the cooling member by offsetting the second inner peripheral edge axially from the radially outer part. This parameter modification allows the cooling member to accommodate thermal expansion while maintaining effective cooling surface area, resolving the contradiction between cooling efficiency and interference prevention.
2Temperature
If the cooling member is made larger to increase cooling surface area, then cooling efficiency is improved, but the structural strength may be reduced
Solution Approach 1:
A curved part is provided between the radially outer part and the second inner peripheral edge of the cooling member. This curved geometry optimizes structural strength by distributing stress more effectively, while still maintaining the required cooling surface area. The curved design prevents stress concentration that would occur with sharp corners in a larger cooling member structure.
3Object-affected harmful factors
If the axial distance between the first attachment surface and the second inner peripheral edge is reduced to control expansion, then interference is prevented, but the strength of the friction member and radially outer part may be reduced
Solution Approach 1:
The curved part is strategically positioned to provide structural reinforcement in the region where the axial distance is minimized. This curvature creates a load-bearing arch effect that compensates for the reduced material thickness, maintaining strength while enabling the small axial distance needed to control thermal expansion and prevent interference.
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 design effectively controls heat expansion, prevents interference, and enhances cooling efficiency, thereby improving braking performance and durability while maintaining strength and wear resistance.
Implementation Method 1
The cooling member includes a cooling body with high thermal conductivity materials to effectively conduct and dissipate heat from the friction member, managing thermal expansion and improving cooling efficiency
Implementation Method 2
When the cooling member expands due to heat, the offset configuration of the second inner peripheral edge prevents interference with adjacent components by providing clearance in the axial direction
Implementation Method 3
The design incorporates air intakes and cooling surfaces that utilize convective airflow to enhance heat dissipation from the friction member, improving overall cooling efficiency and managing thermal expansion
Data Source
AI summary
A bicycle disc brake rotor comprises a friction member and a cooling member. The friction member includes at least one friction surface and a first inner peripheral edge. The cooling member includes a cooling body. The cooling body includes at least one cooling surface and a second inner peripheral edge. The second inner peripheral edge is provided radially inward of the first inner peripheral edge with respect to a rotational center axis of the bicycle disc brake rotor. The radially outer part is provided radially outward of the cooling body. The second inner peripheral edge is offset from the radially outer part in an axial direction parallel to the rotational center axis of the bicycle disc brake rotor.