Motorcycle Brake Disk Inertia Reduction via Inner Pin Connection
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Solution Overview
Problem
Existing brake disk designs for motorcycles suffer from increased inertia due to heavy outer peripheries, which impairs cornering performance, and temperature variations leading to deposition issues during high-speed racing.
Innovation Solution
A brake disk design featuring an annular sliding disk with inwardly projecting engaging convex portions on the sliding disk and corresponding concave portions on the hub disk, connected by a connection pin, allowing for minimal radial movement to absorb thermal expansion and reduce weight, with a groove portion for temperature management and lightening holes for weight reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a connection plate is disposed on the outer periphery of the hub disk to connect the sliding disk and hub disk, then the connection structure can receive braking load, but the outer periphery of the brake disk becomes heavy and inertia increases
Solution Approach 1:
The connection structure transitions from a two-dimensional plate configuration to a three-dimensional arrangement using connection pins positioned at the inner periphery of the sliding disk, extending in the axial direction. This dimensional change allows the connection to occur closer to the rotation axis, reducing the moment of inertia while maintaining load reception capability through the vertical pin structure.
Solution Approach 2:
Instead of placing the connection structure on the outer periphery of the hub disk as in conventional designs, the invention inverts the approach by positioning the connection pins at the inner periphery of the sliding disk. This inversion moves the connection point closer to the center of rotation, significantly reducing the brake disk's moment of inertia while the pins still effectively transmit braking loads between the sliding disk and hub disk.
2Strength
If the outer periphery of the brake disk is made heavy to improve connection strength, then braking load reception improves, but the motorcycle's cornering performance deteriorates due to increased inertia
Solution Approach 1:
The connection structure transitions from a two-dimensional plate configuration to a three-dimensional arrangement using connection pins positioned at the inner periphery of the sliding disk, extending in the axial direction. This dimensional change allows the connection to occur closer to the rotation axis, reducing the moment of inertia while maintaining load reception capability through the vertical pin structure.
Solution Approach 2:
Instead of placing the connection structure on the outer periphery of the hub disk as in conventional designs, the invention inverts the approach by positioning the connection pins at the inner periphery of the sliding disk. This inversion moves the connection point closer to the center of rotation, significantly reducing the brake disk's moment of inertia while the pins still effectively transmit braking loads between the sliding disk and hub disk.
3Object-affected harmful factors
If one or more groove portions are formed in the sliding surface of the sliding disk to prevent noise and clean the surface, then braking noise is reduced, but the structural integrity and heat dissipation may be affected
Solution Approach 1:
The groove portions are strategically positioned in the sliding surface to create local variations that address noise and cleaning needs without compromising overall structural integrity. The grooves are designed with specific dimensions and spacing to remove brake dust and reduce noise generation while maintaining sufficient material strength for heat dissipation and mechanical load bearing.
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 design enhances high-speed cornering performance by minimizing inertia and preventing deposition through controlled temperature distribution and effective heat dissipation, while maintaining structural integrity and braking efficiency.
Implementation Method 1
allowing for minimal radial movement to absorb thermal expansion
Implementation Method 2
effective heat dissipation
Implementation Method 3
controlled temperature distribution
Data Source
AI summary
The present invention is to provide a brake disk capable of enhancing the turning performance of a motorcycle by reducing the inertia, and preventing deposition on a braking portion by reducing a temperature variation of the braking portion. A brake disk 1 is provided with a sliding disk 10, a hub disk 20, and a connection pin 31 for connecting the disks 10 and 20 to each other at plural positions in the circumferential direction of the brake disk 1. An engaging convex portion 12 projecting inwardly of the sliding disk 10 is formed on the sliding disk 10 at circumferential positions corresponding to the connection pins 31. An engaging concave portion 24 for receiving the engaging convex portion 12 is formed in the outer periphery of the hub disk 20. An insertion hole 12c for the connection pin 31 is formed in the engaging convex portion 12.