Brake Actuator Locking Module for Stable Parking Brake Force
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Solution Overview
Problem
The self-releasing embodiment of electromechanical vehicle brakes leads to a weakening of the braking force during the time window between the release of the blocking lever and the activation of the electric motor, compromising the effectiveness of the parking brake function.
Innovation Solution
A brake actuator with an electric motor and a blocking module that includes a pivotable blocking lever with a blocking tooth, which engages with a gear wheel coupled to the electric motor's output shaft. The blocking actuator is a magnetic actuator with a linearly guided armature and a spring for pre-loading, ensuring the blocking lever remains locked until the electric motor activates, preventing further release of the vehicle brake.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the blocking lever is released to allow electric motor activation, then the braking force can be readjusted, but the braking force may further weaken in the time window between release and activation
Solution Approach 1:
The electric motor is activated in advance before the blocking lever is released. This preliminary activation ensures the motor is ready and the braking force is maintained, eliminating the time window where braking force could weaken between release and activation.
2Ease of operation
If the blocking actuator is switched to release the blocking lever, then the electric motor can be activated, but the blocking actuator must be switched again to re-lock after readjustment
Solution Approach 1:
The blocking lever is designed to automatically re-lock after the electric motor completes its rotation. The system uses the motor's own rotation to drive the blocking lever back into the locked position, eliminating the need for a separate re-locking operation of the blocking actuator.
3Reliability
If the blocking lever is resiliently mounted with spring pre-loading, then the blocking tooth automatically engages with the gear wheel, but the spring force must be overcome during engagement
Solution Approach 1:
The blocking lever is designed with dynamic characteristics that allow it to be resiliently mounted with spring pre-loading. The spring force is automatically overcome during the engagement process through the rotational motion of the electric motor, which provides sufficient force to compress the spring and engage the blocking tooth with the gear wheel.
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 ensures that the vehicle brake cannot be released inadvertently, allowing only the boosting of the braking force to readjust the braking force in a parked vehicle, thereby enhancing the reliability of the parking brake function.
Implementation Method 1
a spring for applying a pre-loading force in the direction of the locking position is integrated in the blocking actuator in such a manner that the tappet is resiliently mounted on the armature
Implementation Method 2
The blocking actuator is a magnetic actuator having a moveable, linearly guided armature
Data Source
AI summary
Specified is a brake actuator (12), in particular for an electromechanical vehicle brake (10), having an electric motor (32) for activating the vehicle brake (10), and a blocking module (36) for selectively rotationally blocking an output shaft (38) of the electric motor (32) so as to configure a parking brake function. The blocking module (36) comprises a blocking lever (40) which is mounted so as to be pivotable between a locking position and a releasing position, and a blocking actuator (42) for pivoting the blocking lever (40), wherein configured on the blocking lever (40) is a blocking tooth (44) which in the locking position of the blocking lever (40) engages with a gear wheel coupled to the output shaft (38) of the electric motor (32). The blocking actuator (42) is a magnetic actuator having a moveable, linearly guided armature (48) which is displaceably connected to a tappet (50) coupled to the blocking lever (40), wherein a spring (52) for applying a pre-loading force in the direction of the locking position is integrated in the blocking actuator (42) in such a manner that the tappet (50) is resiliently mounted on the armature (48).