Motor Vehicle Lock Blocking Element and Stop Interaction
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Solution Overview
Problem
Existing motor vehicle door locks with electric motor drives for emergency opening require complex designs and high design efforts due to the need for additional actuators and stops to implement temporary crash redundancy, which increases costs and complexity.
Innovation Solution
A motor vehicle lock design where the blocking element is mounted on the same axis as the safety lever, eliminating the need for additional actuators and simplifying the design by using a stop on the drive interacting with a blocking element, allowing for mechanical and manual opening in emergency situations while ensuring the lock remains secure during normal operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pin with actuator is used to block the output element of the electric motor drive, then temporary crash redundancy is achieved, but design effort and complexity increase
Solution Approach 1:
The blocking function is extracted from the electric motor drive system and transferred to the safety lever system. The pin that previously blocked the motor drive output is now replaced by a blocking element on the safety lever that interacts with a stop on the motor drive, eliminating the need for a separate actuator and reducing overall system complexity while maintaining the temporary crash redundancy function.
Solution Approach 2:
The blocking element is merged with the safety lever assembly, combining the safety function and the blocking function into a single integrated component system. This merging eliminates the need for separate actuators and reduces the number of independent components, thereby reducing design effort while maintaining reliability.
2Reliability
If additional actuators are added for the blocking element, then the blocking function is enhanced, but device complexity and costs increase
Solution Approach 1:
The safety lever system serves dual functions: it provides the safety locking function during normal operation and simultaneously provides the blocking function during emergency situations. The blocking element on the safety lever uses the existing motor drive stop mechanism to achieve blocking without requiring additional actuators, demonstrating self-service functionality that reduces system complexity.
3Reliability
If the stop limits the drive movement to cancel the unlocking position, then the locking mechanism is prevented from opening, but the design complexity increases
Solution Approach 1:
The stop on the motor drive acts as an intermediary element between the motor drive and the blocking element on the safety lever. This intermediary stop mechanism provides a simple mechanical interface that enables the blocking function through interaction with the blocking element, avoiding the need for complex control systems or additional actuators while maintaining locking security.
Data Source
Figure 1A
Figure 1B
Figure 1C
AI summary
The present invention relates to a motor vehicle lock, in particular a motor vehicle door lock, which is equipped with a locking mechanism (1, 2) consisting essentially of a rotary latch (1) and a locking pawl (2). Furthermore, an electric motor drive (4, 5, 6, 7) for the locking mechanism (1, 2) and a locking lever (8) are provided. The electric motor drive (4, 5, 6, 7) acts on the locking mechanism (1, 2) to open it in an opening direction (Ö). The electric motor drive (4, 5, 6, 7) also acts on the locking lever (8) in an unlocking direction (E) that differs from the opening direction (Ö) to assume an unlocked position. Additionally, a stop (7) is provided for the electromechanical drive (4, 5, 6, 7), which, at least when actuated in the opening direction (Ö) to release the unlocked position, limits the movement of the electromechanical drive (4, 5, 6, 7) and thereby prevents the locking mechanism (1, 2) from being opened.According to the invention, the stop (7) is arranged on the electromotor drive (4, 5, 6, 7) and interacts with a blocking element (9).