Mechanical Parking Unlocking Linkage for Power-Off Release
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Solution Overview
Problem
Existing electronic parking mechanisms in new energy vehicles have insufficient structural flexibility and short service life, and require drivers to manually unlock the vehicle when the parking motor is powered off, which is unsafe and uncomfortable.
Innovation Solution
A mechanical unlocking mechanism comprising a parking cam assembly, pawl assembly, and pull rod assembly that allows the parking gear to be fixed or rotated without power, enabling drivers to unlock the vehicle from the cabin, with a torsion spring failure prevention assembly to ensure continued functionality even in case of spring failure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If a parking motor is used for electronic parking, then parking control is automated, but the structure lacks flexibility and service life is short when power is lost
Solution Approach 1:
The parking mechanism is segmented into two independent systems: an electronic parking motor system for automated parking control, and a mechanical unlocking system with pawl and parking cam for manual operation. This segmentation allows each system to function independently, ensuring that automated parking provides convenience while the mechanical system ensures reliability and extended service life when power is lost.
2Ease of operation
If mechanical unlocking is performed under the vehicle when parking motor is powered off, then unlocking is possible, but safety is reduced and comfort is poor
Solution Approach 1:
A mechanical linkage system consisting of a pull rod, connecting rod, and parking cam serves as an intermediary between the driver's pulling action inside the cabin and the pawl assembly. This intermediary mechanism transmits the unlocking force through the vehicle's interior, eliminating the need for the driver to position themselves under the vehicle and thereby removing the safety hazard while maintaining unlocking capability.
3Device complexity
If a simple parking mechanism is used, then structure is simple, but structural flexibility is insufficient
Solution Approach 1:
The parking cam is designed with dynamic geometric features including a first convex part that interacts with the pawl assembly and a second convex part with a connecting part that receives the pull rod. As the parking cam rotates, these dynamic features enable the mechanism to adapt between different operational states (parked and unlocked positions), providing structural flexibility without significantly increasing overall device complexity.
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 mechanism provides a safe and comfortable emergent mechanical unlocking function without the need for drivers to exit the vehicle, ensuring high safety and operational ease while preventing pawl misalignment and maintaining parking functionality.
Implementation Method 1
the paddle spring provides a return force after mechanical unlocking and a continuous power during parking
Data Source
AI summary
A mechanical unlocking mechanism for electronic parking is provided, which comprises a parking cam assembly, a pawl assembly, a pull rod assembly and a parking gear; the parking cam assembly comprises a parking guide shaft and a parking cam, the parking cam is sleeved on the parking guide shaft, at least a first convex part and a second convex part are provided at two sides of the parking cam, and a connecting part is provided on the second convex part; the pull rod assembly is connected with the parking cam via the connecting part, and the pull rod assembly pulls the second convex part to drive the parking cam to rotate; the parking gear can be fixed or rotatable according to the pawl assembly being in a first position where the parking gear parks in or a second position where the parking gear parks out as the parking cam rotates.