Electromechanical Brake Detent Locking for Parking Brake Stability
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Solution Overview
Problem
Electromechanical brakes face challenges in preventing unintentional release of the parking braking state due to reverse rotation of the gear, which can occur due to unintended impacts, necessitating a reliable mechanism to maintain the parking brake engaged.
Innovation Solution
An electromechanical brake system featuring a gear with grooves, a detent that pivots between positions to engage or disengage with the grooves, an actuator to pivot the detent, and an elastic member to ensure stable return to the disengaged position, controlled by a motor and controller to manage the braking state effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a locking mechanism is added to prevent unintentional release of parking brake, then reliability is improved, but device complexity increases
Solution Approach 1:
The locking mechanism is segmented into distinct functional components: a detent element with engagement surface, a spring for applying locking force, and a control mechanism for actuating the detent. This segmentation allows each component to perform its specific function reliably while keeping the overall design manageable and maintainable
Solution Approach 2:
The spring-loaded detent mechanism is designed to automatically engage and lock the parking brake position without requiring continuous external control. Once activated, the system self-maintains the locked state through the spring force, providing reliable parking brake stability without adding complex active control systems
2Reliability
If a detent mechanism is used to lock the gear, then reliability is improved, but ease of operation deteriorates
Solution Approach 1:
The manual detent release mechanism is replaced with an actuator-controlled system. The actuator, driven by a motor, automatically positions the detent to engage or disengage from the gear's grooves, eliminating the need for manual manipulation and improving ease of operation while maintaining reliable locking
Solution Approach 2:
The control mechanism incorporates feedback to detect the gear position and automatically actuate the detent at the appropriate moment. This feedback control ensures the locking mechanism engages reliably while the operator simply needs to initiate the parking brake command, significantly improving ease of operation
3Manufacturing precision
If the detent pivots along a consistent path, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The detent and gear groove are designed with asymmetric geometries that naturally guide the detent along a consistent pivoting path. The shaped engagement surfaces and groove profiles create inherent mechanical guidance, achieving manufacturing precision without requiring additional complex guidance mechanisms
Solution Approach 2:
A guide surface or intermediary structural feature is provided between the detent and gear groove to ensure consistent pivoting motion. This intermediary element simplifies the manufacturing requirements by providing a straightforward geometric constraint, avoiding the need for complex multi-component guidance systems
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 reliably prevents unintended release of the parking brake by ensuring the detent engages securely with the gear's grooves, maintaining the braking state and allowing controlled release through consistent pivoting and elastic force management.
Implementation Method 1
an elastic member arranged to press the detent in a direction from the second position toward the first position
Data Source
AI summary
An electromechanical brake may include a gear configured to provide power for braking when rotating in one direction and to provide power for releasing a braking state when rotating in the other direction, and having one or more grooves; a detent housing; a detent pivotably coupled to the detent housing to pivot between a first position and a second position, wherein the detent does not limit the rotation of the gear at the first position and the detent is engaged with the groove to limit the rotation of the gear at the second position; an actuator configured to cause the detent to be pivoted from the first position to the second position; and an elastic member configured to press the detent in a direction from the second position toward the first position.