Electromechanical Brake Wear Compensation With Adjustable Piston
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Solution Overview
Problem
Conventional electromechanical brake systems face challenges in maintaining braking performance and stability due to brake pad wear, leading to increased size, weight, and issues like drag and noise, while also requiring complex compensation mechanisms.
Innovation Solution
An electromechanical brake system with a power transmission unit and position adjustment mechanism that uses a spindle, nut, and adjusting screw to compensate for brake pad wear and reduce drag, incorporating a detection unit and electronic control for adaptive operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If brake pads are made thicker to compensate for wear, then braking performance is maintained, but the size and axial length of the brake system increases
Solution Approach 1:
The brake system employs a dynamic position adjustment mechanism where the piston can automatically change its axial position relative to the brake disc. Through the adjusting screw and nut mechanism, the piston position is dynamically adjusted to compensate for brake pad wear, allowing the system to maintain optimal braking performance without increasing the overall axial length of the brake assembly.
2Reliability
If a complex compensation mechanism is added to maintain braking performance, then wear compensation is achieved, but device complexity increases
Solution Approach 1:
The brake system incorporates a self-adjusting mechanism where the piston automatically compensates for brake pad wear through its own structural components. The adjusting screw threaded into the piston body allows the piston to self-adjust its position based on wear conditions, eliminating the need for external complex compensation systems and reducing overall device complexity while maintaining braking performance.
3Device complexity
If the piston position is fixed, then the structure is simple, but braking performance deteriorates due to pad wear
Solution Approach 1:
The piston structure incorporates a threaded adjusting screw that enables dynamic position adjustment. This simple threaded mechanism allows the piston to move axially to compensate for brake pad wear, maintaining braking performance without requiring complex multi-component adjustment systems. The dynamic adjustability is achieved through a straightforward screw-thread engagement between the adjusting screw and piston body.
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 system maintains braking performance, reduces size and weight, and minimizes drag and noise by automatically adjusting the piston position to compensate for brake pad wear and improve vehicle stability.
Implementation Method 1
a nut connected to the spindle and moving forward or backward an inside of the piston by rotation of the spindle in a first direction or a second direction
Implementation Method 2
a second screw thread formed on an inner circumferential surface of the piston and meshing with the first screw thread
Data Source
AI summary
Disclosed is an electromechanical brake and a method of operating the same. In accordance with an aspect of the disclosure the electromechanical brake includes a piston configured to advance and retreat to press a brake pad; a power transmission unit configured to receive a driving force from an actuator to convert a rotational motion into a linear motion, and provide the converted driving force to the piston; and a position adjustment unit configured to adjust a relative position of the piston with respect to the power transmission unit; wherein the power transmission unit includes a spindle rotating by receiving the driving force from the actuator, and a nut connected to the spindle and moving forward or backward an inside of the piston by rotation of the spindle in a first direction or a second direction to advance and retreat the piston, wherein the position adjustment unit includes an adjusting screw provided on an outer side of the nut and rotating together with the nut, a first screw thread formed on an outer circumferential surface of the adjusting screw, a second screw thread formed on an inner circumferential surface of the piston and meshing with the first screw thread, and an adjuster provided between the spindle and the nut and configured to rotate the nut and the adjusting screw in the first direction or the second direction by rotation of the spindle to advance and retreat the relative position of the piston.