Waveform Brake Disc Structure for Uniform Heat Capacity
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Solution Overview
Problem
Brake discs with waveform portions experience increased temperature irregularity and degraded brake feeling due to their complex shapes, and attempts to enhance heat capacity lead to increased weight.
Innovation Solution
A brake disc with a waveform portion that has a uniform heat capacity distribution in both the circumferential and radial directions, achieved by forming the outer circumferential portion with specific ratios of heat capacity differences and incorporating through-holes to increase surface area for cooling efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If waveform portions are formed on the brake disc outer circumference, then brake pad powder is removed effectively, but temperature irregularity increases and brake feeling degrades
Solution Approach 1:
The patent applies local quality by creating waveform portions only in the outer circumferential portion (sliding area) where brake pad contact occurs, while keeping the inner circumferential portion smooth. This localized waveform structure removes powder effectively at the contact interface without causing temperature irregularity in the non-contact inner region, thus resolving the contradiction between powder removal and temperature uniformity.
2Temperature
If the brake disc heat capacity is increased to improve brake feeling, then heat storage capability improves, but the brake disc weight increases
Solution Approach 1:
The patent applies local quality by concentrating the heat capacity enhancement function in the inner circumferential portion (non-sliding area) while keeping the outer circumferential portion optimized for powder removal. The inner portion is designed with larger heat capacity to absorb thermal energy, while the outer waveform portion maintains lower mass for effective powder clearance, thus improving brake feeling without excessive weight gain.
3Temperature
If the brake disc outer circumferential area is increased to improve heat capacity, then heat storage improves, but the brake disc weight increases
Solution Approach 1:
The patent applies local quality by designing the inner circumferential portion with larger area and heat capacity for thermal energy storage, while the outer circumferential portion maintains optimized area for powder removal functionality. This spatial differentiation allows the system to achieve improved heat capacity through the inner portion without requiring increased overall disc weight, as the outer portion remains compact and functional.
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 solution provides improved brake feeling and cooling efficiency while maintaining equivalent heat capacity and weight, reducing temperature irregularity and enhancing braking performance.
Implementation Method 1
small amounts of powder generated due to wear of brake pads are removed by the waveform portions
Implementation Method 2
substantially uniform heat capacity distribution in a circumferential direction and in a radial direction
Implementation Method 3
cooling efficiency
Data Source
AI summary
A brake disc includes an outer circumferential portion including a waveform portion having recessed portions and projecting portions repeatedly formed over an outer circumference, and for the outer circumferential portion to have substantially uniform heat capacity distribution in a circumferential direction and in a radial direction, the outer circumferential portion is formed such that a ratio of a difference in heat capacities among a plurality of circumferential sections in the outer circumferential portion, which are sectioned at an equal angle in the circumferential direction, relative to a heat capacity of each circumferential section is equal to or less than a first predetermined ratio. A ratio of a difference in heat capacities among radial sections in the outer circumferential portion, which are sectioned to have an equal length in the radial direction, relative to a heat capacity of each radial section is equal to or less than a second predetermined ratio.