Parking Lock Spindle Drive Manual Release Mechanism
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Solution Overview
Problem
Existing parking lock arrangements for vehicles lack a robust and maintenance-friendly solution for forced releasing, especially in cases where the actuator fails, making it difficult to manually release the locking mechanism without interfering with normal operation.
Innovation Solution
A parking lock arrangement with a spindle drive and actuator that includes a movable unlocking element, which is initially spaced from the spindle shaft during normal operation but can be manually coupled in a torque-transmitting manner to the spindle shaft for forced releasing, allowing manual rotation to release the lock mechanism when the actuator fails.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the unlocking element is permanently coupled to the spindle shaft, then forced releasing is always possible, but normal operation is interfered with and the structure becomes more complex
Solution Approach 1:
The unlocking element is designed to be movable relative to the spindle shaft, transitioning between a spaced position during normal operation and an engaged position during forced releasing. This dynamic configuration allows the system to adapt its structure based on operational requirements, maintaining simplicity during normal use while enabling forced releasing when needed.
Solution Approach 2:
The unlocking mechanism is separated into distinct components: the unlocking element, the spindle shaft, and the control element. These segments can move independently relative to each other, with the unlocking element able to engage or disengage from the spindle shaft as needed, reducing overall structural complexity while maintaining functionality.
2Reliability
If the unlocking mechanism is always engaged with the spindle shaft, then forced releasing is enabled, but the locking mechanism cannot operate freely
Solution Approach 1:
The unlocking element is designed to be movable relative to the spindle shaft, transitioning between a spaced position during normal operation and an engaged position during forced releasing. This dynamic configuration allows the system to adapt its structure based on operational requirements, maintaining simplicity during normal use while enabling forced releasing when needed.
3Adaptability or versatility
If a manual control element is added for forced releasing, then emergency release capability is improved, but the device complexity increases
Solution Approach 1:
The control element is designed to perform multiple functions: it can selectively engage the unlocking element with the spindle shaft for forced releasing, and also rotate the unlocking element to turn the spindle shaft. This multi-functionality reduces the need for separate components, thereby limiting the increase in device complexity while improving adaptability.
Solution Approach 2:
The control element combines the functions of engagement (connecting/disconnecting the unlocking element from the spindle shaft) and actuation (rotating the unlocking element) into a single integrated component, reducing overall device complexity while providing comprehensive emergency release capability.
Data Source
AI summary
A parking lock arrangement for a drive train of a motor vehicle includes a controllable locking mechanism and an unlocking mechanism. The controllable locking mechanism includes a spindle drive with a spindle shaft rotationally drivable about a spindle axis, an actuator for rotating the spindle shaft and a positioning element movable by rotating the spindle shaft for actuating a blocking element. The blocking element acts at least indirectly on a drive element in a blocking or releasing manner. The unlocking mechanism includes an unlocking element and a manually operable control element. The unlocking element is movable via the control element from a normal position, in which the unlocking element is spaced apart from the spindle shaft, into an engagement position, in which the unlocking element is coupled in torque-transmitting manner to the spindle shaft for forced releasing of the locking mechanism.