Brake Piston Elastic Zoning to Prevent Twisting Under Braking
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Solution Overview
Problem
In hydraulic brake systems, particularly in floating caliper disc brakes, the piston pressing the brake pad can become twisted due to caliper housing deformation and disc rotation, leading to unstable braking as it contacts the cylinder wall, causing damage and improper pad pressing.
Innovation Solution
A brake piston design featuring a body portion with distinct radial sections, each with different coefficients of elasticity and potentially different materials, to prevent twisting by managing deformation differently across the piston's radial direction, including a third body portion between the first and second body portions for enhanced stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single-material piston body is used, then the structure is simple and easy to manufacture, but the piston becomes twisted during braking due to uniform deformation
Solution Approach 1:
The piston body is divided into multiple sections (first body portion and second body portion) with different coefficients of elasticity. This segmentation allows each section to deform differently during braking, preventing the piston from twisting while maintaining manufacturing feasibility through modular construction.
Solution Approach 2:
Different sections of the piston body are assigned different material properties (different coefficients of elasticity) to create local quality variations. The first body portion has a higher coefficient of elasticity than the second body portion, enabling controlled differential deformation that prevents twisting during braking operation.
2Reliability
If the piston is prevented from twisting, then braking stability is improved, but the piston structure becomes more complex
Solution Approach 1:
The piston is segmented into functional zones with different elastic properties, allowing the structure to achieve anti-twisting functionality through material distribution rather than complex geometric features. This maintains relative structural simplicity while improving braking stability.
Solution Approach 2:
The piston employs composite construction with multiple materials or material regions having different coefficients of elasticity. This composite approach enables the piston to resist twisting forces through material property differentiation rather than complex structural design, balancing reliability and simplicity.
3Ease of manufacture
If uniform material properties are used throughout the piston, then manufacturing is easier, but deformation is uneven causing piston contact with cylinder wall
Solution Approach 1:
The piston incorporates local quality variations through different material properties in different sections. The first body portion and second body portion have different coefficients of elasticity, which controls the deformation pattern to remain uniform and prevent contact with the cylinder wall during braking.
Solution Approach 2:
By segmenting the piston into distinct material zones, the design achieves controlled deformation characteristics. Each segment deforms according to its material properties, resulting in overall uniform deformation behavior that prevents cylinder wall contact while maintaining manufacturing practicality.
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 effectively prevents piston twisting during braking, ensuring stable pad pressing and reducing the risk of cylinder damage by distributing deformation uniformly across the piston's sections, thereby maintaining consistent braking performance.
Implementation Method 1
a second body portion provided at an inner side of the body portion in a radial direction of the disc and having a coefficient of elasticity that is different from a coefficient of elasticity of the first body portion
Data Source
AI summary
According to an aspect of the disclosure, there is provided a brake piston provided in a brake system of a vehicle and pressing a brake pad to a disc by braking hydraulic pressure, the brake piston including: a body portion installed in a cylinder provided in a caliper housing, being in a shape of a pillar, and configured to be movable forward and backward, wherein the body portion includes: a first body portion provided at an outer side of the body portion in a radial direction of the disc; and a second body portion provided at an inner side of the body portion in the radial direction of the disc and having a coefficient of elasticity that is different from a coefficient of elasticity of the first body portion.