Parking Lock Actuation for Emergency Release Without Actuator Damage
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing motor vehicle transmission systems lack a reliable mechanism to prevent rolling away without using the parking brake, especially when hydraulic pressure drops, and emergency deactivation of the parking lock should not affect the control actuator's position.
Innovation Solution
A parking lock system with a pivotable locking pawl and two actuating elements, where the second actuating element, via a spring element, transfers the first actuating element between engaged and disengaged positions to activate or deactivate the lock, allowing emergency release without affecting the control actuator's position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the parking lock is deactivated via the control actuator, then the locking pawl is released, but the control actuator remains in its current position which may cause damage in emergency situations
Solution Approach 1:
The actuating mechanism is segmented into two independent actuating elements: a first actuating element coupled to the locking pawl and a second actuating element coupled to the control actuator. This segmentation allows the first element to be moved by the emergency release device without affecting the position of the control actuator, thus preventing damage while enabling emergency release.
Solution Approach 2:
A coupling point is introduced as an intermediary between the first actuating element and the second actuating element. This coupling point allows the emergency release device to move the first actuating element independently without directly affecting the control actuator, serving as a mediator that protects the control actuator from damage during emergency operations.
2Ease of operation
If two separate spring elements are used to move the first actuating element relative to the second, then emergency release is enabled, but the device complexity increases
Solution Approach 1:
The patent merges the functions of two separate spring elements into a single spring element that performs both actions: moving the first actuating element relative to the second during normal operation, and enabling emergency release when the second actuating element is in its actuating position. This reduces component count and simplifies the overall device structure.
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
Enables reliable activation and deactivation of the parking lock with low manufacturing effort, preventing damage to the control actuator and ensuring compact design.
Implementation Method 1
a spring element, by which the first actuating element is movable between the engaged position and the disengaged position
Data Source
AI summary
A parking lock system for motor vehicle transmissions has a locking pawl pivotable between an interlock position and a release position, and a first actuating element movable between a disengaged position and an engaged position, where movement of the first actuating element induces pivoting of the locking pawl. The system includes a second actuating element movable between an actuating position and an element release position, the second actuating element contacting and moving the first actuating element from the engaged position into the disengaged position when moving from the actuating position into the element release position. The system includes a spring element that moves the first actuating element into the engaged position when the second actuating element moves into the actuating position, and allows the first actuating element to move relative to the second actuating element into the disengaged position when the second actuating element is in the actuating position.