Parking Brake Emergency Actuator With Passive Acceleration Compensation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing parking brake systems in vehicles are prone to undesired triggering due to acceleration peaks during extreme conditions, leading to unintended application of the parking brake and subsequent noise issues, especially during off-road travel.
Innovation Solution
A parking brake assembly with a spring accumulator featuring a pawl and a mass element connected to the lift magnet, where the mass element counteracts undesired accelerations by executing a rotary movement, ensuring the inertial forces align to compensate for the armature's movement, preventing the spring accumulator from being triggered inadvertently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a lift magnet is used for emergency actuation of the parking brake, then the parking brake can be reliably applied in case of loss of function of the primary actuator, but the lift magnet may be undesirably triggered by acceleration peaks during vehicle operation
Solution Approach 1:
A mass element is integrated into the spring accumulator mechanism to generate counteracting inertial forces during acceleration. This mass element creates a compensating force that offsets the harmful acceleration peaks, preventing false triggering of the lift magnet while maintaining emergency braking reliability
Solution Approach 2:
The spring accumulator is pre-loaded with a spring force that creates a preliminary counteracting force against acceleration-induced movements. This pre-tensioned spring provides immediate resistance to acceleration peaks before they can trigger the lift magnet undesirably
2Device complexity
If the spring accumulator is designed with a simple pawl mechanism, then the device complexity is reduced, but the system becomes vulnerable to undesired triggering by vibrations and impacts
Solution Approach 1:
The mass element is integrated directly into the existing pawl mechanism, adding inertial compensation without requiring a completely new structural design. This maintains relative simplicity while significantly improving protection against false triggering
Solution Approach 2:
The mass element is combined with the pawl structure, merging two functions (mechanical engagement and inertial compensation) into a single integrated component. This reduces overall device complexity while achieving both goals simultaneously
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
This solution effectively prevents the undesired triggering of the lift magnet, maintaining the parking brake in a locked state during extreme accelerations, thus reducing noise and ensuring the vehicle remains stationary as intended, even under high G-forces.
Implementation Method 1
a mass element connected to the pawl and rotatable about a second pivot point... wherein the spring accumulator can be triggered via the pawl with a first rotary movement, wherein a compensation rotary movement occurs in a second rotary movement via the mass element with an inert mass
Data Source
AI summary
Parking brake assembly for a transmission in a vehicle with an electric actuation of the parking brake via a mechanism and with an emergency actuator with a lift magnet on a spring accumulator for application of the parking brake. The spring accumulator has a pawl rotatable about a pivot point connected to the lift magnet and a mass element connected to the pawl and rotatable about a second pivot point.