Friction Brake Device with Auto-Rotating Pads for Stable Torque
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Solution Overview
Problem
In friction brake devices where a friction member is pressed against both a lateral face and a cylindrical face of a brake rotor, changes in the friction coefficient and pressing force over time lead to unstable braking torque, affecting the device's ability to generate a consistent braking force.
Innovation Solution
A friction brake device design where a rotary friction member rotates around an axis parallel to the brake rotor's axis, supported by a member that presses it perpendicularly against the rotor, ensuring uniform abrasion and maintaining a consistent frictional engagement with the cylindrical face, thereby stabilizing the braking force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a friction member is pressed against a lateral face and cylindrical face of a brake rotor to generate higher braking torque, then braking torque is improved, but the friction coefficient and pressing force change over time causing unstable braking performance
Solution Approach 1:
The friction member is designed to rotate around its own axis (autorotation) while being pressed against the brake rotor. This dynamic rotation allows the friction member to continuously change its contact position on the cylindrical face, preventing localized wear and maintaining consistent friction characteristics over time, thus resolving the contradiction between high braking torque and stable performance
Solution Approach 2:
The invention changes the operational parameters of the friction member by enabling it to rotate around its own axis in addition to revolving around the brake rotor axis. This parameter change from static to dynamic contact allows the friction member to distribute wear uniformly across its outer periphery, maintaining consistent pressing force and friction coefficient throughout operation
2Power
If a friction member is frictionally engaged with a cylindrical face of a brake rotor, then higher braking torque is generated, but the frictionally engaged region changes causing changes in pressing force
Solution Approach 1:
The friction member performs autorotation around its own axis, making the contact region with the cylindrical face continuously change. This dynamic behavior ensures that wear is distributed uniformly across the entire outer periphery of the friction member, preventing localized wear progression that would otherwise cause pressing force variations
Solution Approach 2:
The friction member is designed to automatically rotate upon engagement with the brake rotor, distributing wear before significant abrasion can occur. This preliminary action of uniform wear distribution prevents future changes in pressing force and maintains stable braking characteristics throughout the service life of the friction member
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 configuration reduces variations in friction coefficient and pressing force, allowing for a stable and long-lasting braking performance with a higher braking torque compared to devices that only engage with a lateral face.
Implementation Method 1
a frictional force between the rotary friction member and the lateral face of the brake rotor when the pressing device starts pressing the rotary friction member causes the rotary friction member to auto-rotate
Implementation Method 2
a braking torque is generated also through frictional engagement of a friction member with a cylindrical face on an outer periphery of a brake rotor
Data Source
AI summary
A friction brake device has a brake rotor that rotates around an axis of rotation, brake pads that can rotate around an axis of autorotation parallel to the axis of rotation, support members that support the brake pads respectively, and pressing devices that press the brake pads against the brake rotor respectively. In the friction brake device, when the brake pads are pressed against the brake rotor, the brake pads revolve around the axis of rotation relatively to the brake rotor while being frictionally engaged with lateral faces of the brake rotor respectively. The support members press the brake pads in a direction perpendicular to the axis of rotation, and frictionally engage outer peripheries of the brake pads with a cylindrical face of the brake rotor respectively. The brake pads auto-rotate around the axis of autorotation upon beginning to be pressed, but come to rest when the pressing force increases.