Bicycle Disk Brake Caliper Recursive Cooling System
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Solution Overview
Problem
Existing disc brake systems for bicycles suffer from vapor-lock due to overheated hydraulic fluid, leading to inconsistent braking performance, despite various attempts to mitigate this issue through larger caliper housings, wider brake discs, and separate cooling systems, none of which effectively optimize the cooling of hydraulic fluid.
Innovation Solution
A bicycle disk brake caliper with a cooling system that includes a thermally conducting caliper housing, a piston, hydraulic inlet, cooling member, heat transfer space, and check valves to ensure hydraulic fluid flows only one way through the cooling system, allowing direct cooling of the fluid without the need for separate pumps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the caliper housing is made larger to absorb more heat, then heat absorption capacity is improved, but device complexity and size increase
Solution Approach 1:
The cooling system is divided into separate functional components: cooling channels integrated into the piston, cooling fins on the caliper housing, and a cooling inlet. This segmentation allows efficient heat dissipation without requiring an overall increase in caliper size, as each component performs a specific cooling function.
Solution Approach 2:
The cooling function is merged with the existing piston and caliper housing structures. Cooling channels are integrated directly into the piston body, and cooling fins are incorporated into the caliper housing design, combining structural and thermal management functions without adding separate cooling systems.
2Temperature
If separate cooling systems are added to circulate cooling fluid, then cooling effectiveness is improved, but device complexity increases
Solution Approach 1:
The system uses the hydraulic fluid itself as the cooling medium, eliminating the need for separate cooling fluid circulation systems. The hydraulic fluid cools itself by flowing through cooling channels in the piston and dissipating heat through cooling fins on the caliper housing, providing a self-service cooling solution.
Solution Approach 2:
The hydraulic fluid serves dual functions: actuating the brake mechanism and cooling the system. By using the same fluid for both braking and cooling purposes, the system eliminates the need for separate cooling fluid circuits, reducing overall system complexity while maintaining effective cooling.
3Temperature
If hydraulic fluid is cooled through separate cooling chambers, then cooling performance is improved, but ease of operation deteriorates due to additional components
Solution Approach 1:
The cooling channels are integrated directly into the piston structure, merging the cooling function with the actuating mechanism. This integration eliminates separate cooling chambers and reduces the number of components, thereby improving ease of operation while maintaining effective cooling performance.
4Ease of manufacture
If conventional friction pads are used, then ease of manufacture is improved, but heat dissipation capability worsens
Solution Approach 1:
The friction pads are designed with specific material properties and structural characteristics optimized for heat dissipation. The pads use materials and constructions that facilitate heat transfer to the cooling channels in the piston, providing enhanced heat dissipation capability while maintaining manufacturability through standardized production methods.
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 described cooling system effectively prevents vapor-lock by ensuring hydraulic fluid is cooled as it moves the piston, enhancing braking consistency and performance by maintaining the fluid's temperature, thus improving the overall braking experience.
Implementation Method 1
a heat transfer space in fluid communication with the cooling inlet for engaging hydraulic fluid received through the cooling inlet with the cooling member
Data Source
AI summary
A bicycle brake disk caliper apparatus comprises a caliper housing, a piston operatively coupled to the caliper housing so that the piston moves between a brake release position and a brake activating position, a hydraulic inlet for receiving a hydraulic fluid to move the piston, a piston activating space in fluid communication with the hydraulic inlet so that the hydraulic fluid moves the piston from the brake release position to the brake activating position, a cooling member, a cooling inlet in fluid communication with the hydraulic inlet, a heat transfer space in fluid communication with the cooling inlet, and a cooling outlet in fluid communication with the heat transfer space for communicating hydraulic fluid from the heat transfer space so that at least a portion of hydraulic fluid flows only one way from the hydraulic inlet, through the cooling inlet, and through the heat transfer space.