Multi-Screw Electromechanical Brake Layout for Higher Clamp Force
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Solution Overview
Problem
Existing electromechanical brake systems face challenges in efficiently applying and releasing brake forces due to limitations in torque transmission and force distribution across multiple screw-nut mechanisms.
Innovation Solution
The proposed electromechanical brake system incorporates a pair of screw-nut mechanisms connected by a drive gear, which is rotated by an actuator assembly. This configuration allows simultaneous rotation and linear movement of the screw-nut mechanisms, enabling efficient application and release of brake forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a single screw-nut mechanism is used in existing electromechanical brake systems, then the structure is simpler, but the clamp force and torque transmission efficiency are insufficient
Solution Approach 1:
The brake system is divided into multiple independent screw-nut mechanisms (first and second screw-nut mechanisms) that work in parallel. Each mechanism has its own rotatable body, translatable body, and gear assembly, allowing the system to generate higher clamp forces through combined action while maintaining modular simplicity in each individual mechanism's design.
2Force
If multiple screw-nut mechanisms are used to increase clamp force, then the brake performance is improved, but the stress on individual components increases and durability decreases
Solution Approach 1:
The total braking force requirement is segmented across multiple screw-nut mechanisms. Each mechanism handles a portion of the total load, distributing the stress and preventing any single component from experiencing excessive stress that would compromise durability.
3Force
If multiple screw-nut mechanisms are used to achieve higher clamp forces, then brake performance is improved, but the axial space required for the system increases
Solution Approach 1:
The drive gears of the multiple screw-nut mechanisms are arranged in a radial configuration around a central actuator, rather than stacking them axially. This radial arrangement in the horizontal plane allows multiple mechanisms to operate simultaneously while minimizing the axial space requirement, effectively transitioning from vertical stacking to horizontal distribution.
4Device complexity
If a single actuator drives multiple screw-nut mechanisms, then the device complexity is reduced, but the torque transmission efficiency and force distribution become challenging
Solution Approach 1:
A drive gear acts as an intermediary between the single actuator and the multiple screw-nut mechanisms. The actuator rotates the drive gear, which then meshes with and transmits torque to the drive gears of individual screw-nut mechanisms, enabling efficient and balanced force distribution across all mechanisms while maintaining a simple single-actuator configuration.
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 achieves higher clamp forces and reduced stress on individual components, leading to improved brake performance and extended durability, while also minimizing the axial space required for the brake system.
Implementation Method 1
each screw-nut mechanism comprising a rotatable body configured to be rotatable and a translatable body operably coupled with the rotatable body, the translatable body configured to be axially translatable relative to the rotatable body to move a brake pad assembly according to rotation of the rotatable body
Implementation Method 2
the rotatable body of the first screw-nut mechanism is provided with the first gear and the rotatable body of the second screw-nut mechanism is provided with the second gear; a drive gear rotatably engaged between the first gear of the rotatable body of the first screw-nut mechanism and the second gear of the rotatable body of the second screw-nut mechanism
Data Source
AI summary
An electromechanical brake system may comprise: a pair of screw-nut mechanisms comprising first and second screw-nut mechanisms, each screw-nut mechanism comprising a rotatable body configured to be rotatable and a translatable body operably coupled with the rotatable body, the translatable body configured to be axially translatable relative to the rotatable body to move a brake pad assembly according to rotation of the rotatable body, wherein the rotatable body of the first screw-nut mechanism is provided with the first gear and the rotatable body of the second screw-nut mechanism is provided with the second gear; an actuator assembly configured to provide a torque; and a drive gear rotatably engaged between the first gear of the rotatable body of the first screw-nut mechanism and the second gear of the rotatable body of the second screw-nut mechanism and operably connected to the actuator assembly to be rotated by the torque of the actuator.