Brake Pad Hard Particles and Disk Convex Portions Friction
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Solution Overview
Problem
Brake devices with hard members on both the pad and disk exhibit poor frictional force while attempting to maintain abrasion resistance, as they either suffer from low frictional force or excessive wear.
Innovation Solution
A brake device design featuring a first friction member with elastically supported convex portions that continuously contact corresponding convex portions on a second friction member, allowing for enhanced abrasion resistance and increased frictional force by adjusting contact points and surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If hard members are disposed on both the pad and the disk to improve abrasion resistance, then abrasion resistance is improved, but frictional force becomes insufficient
Solution Approach 1:
The invention applies different surface characteristics to different regions of the friction members. The pad has hard particles embedded in its friction surface for abrasion resistance, while the disk has convex portions with specific curvature radii (0.5-5mm) that create adhesion friction. This local differentiation allows each surface to contribute its optimal property: the pad provides durability through hard particles, while the disk's convex portions generate sufficient frictional force through adhesion mechanisms.
Solution Approach 2:
The invention combines different material properties on the friction surfaces. The pad uses a composite structure with hard particles (such as ceramic or metal particles) embedded in a friction material matrix. The disk uses a composite surface structure combining convex portions with specific geometry and material properties. This composite approach allows the system to achieve both high abrasion resistance from the hard particles and sufficient frictional force from the adhesion friction at the convex portion contacts.
2Force
If soft resin-based pad and harder cast-iron rotor are used to generate frictional force by adhesion friction, then frictional force is generated, but brake performance is poor
Solution Approach 1:
The invention changes the geometric parameters of the friction surfaces, specifically introducing convex portions with controlled curvature radii (0.5-5mm) on the disk surface. This geometric modification transforms the friction mechanism from simple adhesion friction to a combination of adhesion friction at contact points and mechanical interlocking. The parameter optimization of convex portion dimensions ensures sufficient frictional force while maintaining reliable brake performance through consistent contact characteristics.
3Force
If low-steel pad made of hard steel fiber and softer cast-iron rotor are used to generate frictional force by abrasive friction, then frictional force is generated, but the rotor is greatly abraded
Solution Approach 1:
The invention applies hard particles locally on the pad surface rather than making the entire pad hard. This localized application of hard particles (such as ceramic or metal particles embedded in the friction material) provides abrasion resistance at the contact points while the bulk pad material remains softer and more compliant. This local quality approach reduces overall rotor abrasion while maintaining sufficient frictional force generation.
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 achieves a larger frictional force without compromising abrasion resistance by ensuring continuous contact and efficient energy conversion through elastic support and optimized convex surface interactions.
Implementation Method 1
The first friction surface includes first convex portions that are elastically supported in a direction perpendicular to the second friction surface
Implementation Method 2
a brake device, which is formed of the combination of a non-steel pad made of a soft resin-based ingredient and a harder cast-iron rotor and generates a frictional force by adhesion friction
Data Source
AI summary
A brake device includes a pad 100a having a friction surface 101 and a disk 200a having a friction surface 201 sliding on the friction surface 101. The friction surface 101 includes hard particles 102 that are elastically supported in a y direction perpendicular to the friction surface 201. The friction surface 201 includes a plurality of convex portions 202 that is disposed in a direction where the friction surface 201 slides on the friction surface 101. When the friction surface 201 slides on the friction surface 101, the hard particles 102 continuously come into contact with the convex portions 202, respectively, while being displaced in the y direction perpendicular to the friction surface 201. Accordingly, the brake device can improve abrasion resistance as compared to a brake device that mainly performs abrasive friction. When the hard particle 102 comes into contact with the next convex portion 202 after coming into contact with one convex portion 202, the hard particle 102 comes into contact with the convex portion 202 at a position lower than the apex of the convex portion 202. Accordingly, the hard particles 102 continuously come into contact with the convex portions 202 so as to follow the convex portions 202, respectively. Therefore, it may be possible to obtain a larger frictional force.