Electric Brake Piston Alignment for Uniform Pad Pressure
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Solution Overview
Problem
Existing electric brake apparatuses for vehicles suffer from non-uniform surface pressures applied to brake pads due to product errors, leading to reduced braking force and increased drag torque due to insufficient return force of pistons.
Innovation Solution
A brake apparatus with rotatable screw bars, nut parts, piston parts, elastic springs, and position adjusters that ensure uniform surface pressures by allowing piston parts to return to their original position effectively, using elastic restoring forces and adjustable nut part positions to align piston parts on the same line.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If existing electric brake apparatus uses screw gear mechanism without hydraulic pressure, then braking force is generated, but return force becomes insufficient causing drag torque
Solution Approach 1:
The brake apparatus is divided into independent piston parts (first and second piston parts) that can be adjusted separately, allowing individual compensation for non-uniform surface pressures and improving return force distribution
Solution Approach 2:
The position adjusters enable changing the positional parameters of the piston parts relative to the brake pad, allowing optimization of the return force distribution to eliminate drag torque while maintaining braking force
2Area of stationary object
If existing electric brake apparatus includes multiple pistons, then braking coverage is improved, but surface pressures become non-uniform due to product errors
Solution Approach 1:
The position adjusters make the piston parts dynamically adjustable rather than fixed, enabling real-time compensation for manufacturing variations and ensuring uniform surface pressure distribution across the brake pad contact area
Solution Approach 2:
The adjustable mechanism provides a feedback loop where the position of each piston part can be modified based on observed pressure distribution, allowing correction of non-uniformities caused by product errors
3Force
If piston parts are pressed against brake pad, then braking force is applied, but piston parts do not return to original position causing contact with brake disk
Solution Approach 1:
The elastic springs act as counterbalancing elements that provide a return force opposite to the braking force, ensuring piston parts reliably return to their original position and maintain proper spacing from the brake disk
Solution Approach 2:
The elastic springs are pre-installed on the piston parts to provide cushioning and return force before the piston needs to return, ensuring reliable spacing maintenance and preventing contact with the brake disk
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 solution enhances return forces, reduces drag torque, and ensures uniform surface pressures on brake pads, thereby improving braking efficiency and maintaining perfect spacing between brake disks and pads.
Implementation Method 1
an elastic spring installed on each of the piston parts, and configured to apply an elastic restoring force to cause the piston part to return to an original position
Data Source
AI summary
A brake apparatus for a vehicle may include: a pair of screw bars located in a caliper body; a pair of nut parts configured to cover outsides of the respective screw bars, engaged with the respective screw bars, and selectively moved toward a brake pad or moved to an opposite side of the brake pad; a pair of piston parts moved with the nut parts, and configured to apply pressure to the brake pad when pressed by the nut parts or remove the pressure applied to the brake pad when a pressing of the nut parts is removed; an elastic spring installed on each of the piston parts, and configured to apply an elastic restoring force to cause the piston part to return to an original position; and a spring retainer mounted on each of the piston parts, and brought into contact with the elastic spring.