Ventilated Brake Disc Rotor Joints for Thermal Buckling
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Solution Overview
Problem
Conventional ventilated type brake disc rotors experience reduced rigidity and thermal buckling due to the inverted triangular shape of their second joints, leading to judder issues.
Innovation Solution
The design incorporates annular sliding plates connected by joints arranged in a circumferential direction, with second joints featuring a pentagonal cross-section and varying widths to increase cross-sectional area and eigenfrequency, and additional third joints to enhance rigidity and ventilation efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the second joints are formed with an inverted triangle shape, then the brake disc rotor can be manufactured with simplified joint geometry, but the rigidity of the brake disc rotor decreases and thermal buckling occurs
Solution Approach 1:
The patent changes the geometric parameters of the second joints by increasing their circumferential width at the outer peripheral side while maintaining the inverted triangle shape. This parameter modification increases the cross-sectional area of the joints, thereby enhancing rigidity and suppressing thermal buckling while preserving the simplified manufacturing approach
Solution Approach 2:
The patent introduces asymmetric geometry to the second joints by making the circumferential width vary along the radial direction, with the outer peripheral side having a larger width than the inner peripheral side. This asymmetric design optimizes the distribution of structural strength where it is most needed (at the outer periphery) while maintaining manufacturing simplicity
2Device complexity
If the second joints are formed with an inverted triangle shape, then the joint structure can be simplified, but thermal buckling and judder occur
Solution Approach 1:
The patent modifies the dimensional parameters of the second joints by increasing the circumferential width at the outer peripheral side. This parameter change enhances thermal stability and prevents buckling while keeping the overall joint structure relatively simple and easy to manufacture
3Strength
If the circumferential width of second joints is increased at the outer peripheral side, then rigidity and eigenfrequency increase, but the cross-sectional area of joints increases
Solution Approach 1:
The patent applies local quality by concentrating the increased circumferential width of the second joints specifically at the outer peripheral side where rigidity is most critical, while maintaining smaller dimensions at the inner peripheral side. This localized enhancement improves overall rigidity and eigenfrequency with minimal increase in total mass
Data Source
AI summary
A ventilated type brake disc rotor includes: a pair of sliding plates shaped annular and disposed opposite to each other in an axle direction; and joints formed to connect between the sliding plates and arranged along lines extending in a circumferential direction of the sliding plates. The joints include first joints arranged along a first line and second joints arranged along a second line located in an outer side with respect to the first line in a radial direction of the sliding plates. Each of the second joints includes a first width part and a second width part formed in an inner side with respect to the first width part in the radial direction. The second width part is less in circumferential width than the first width part, and is shaped to decrease in circumferential width as going inwardly in the radial direction.