Cabin-Operated Mechanical Parking Unlocking With Pull-Cord Actuation
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Solution Overview
Problem
Existing electronic parking mechanisms in new energy vehicles lack structural flexibility, have short service life, and require drivers to manually unlock the mechanical mechanism under the vehicle when the parking motor is powered off, posing safety and comfort concerns.
Innovation Solution
A gearbox with a mechanical unlocking mechanism incorporating a parking cam assembly, pawl assembly, pull cord assembly, and actuating assembly, allowing for flexible rotation and axial translation to enable manual unlocking from the vehicle cabin without power, and a torsion spring failure prevention assembly to maintain functionality in case of spring failure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the mechanical unlocking mechanism is located under the vehicle and requires manual operation, then the structure is simple, but the safety and comfort are poor
Solution Approach 1:
The patent introduces a pull cord as an intermediary element that transmits the unlocking force from the driver's operation inside the cabin to the parking mechanism. The pull cord assembly includes a pull cord, guide holes, and connection points that enable force transmission through the vehicle body without requiring direct access to the mechanical components under the vehicle.
Solution Approach 2:
The patent relocates the unlocking operation from the vertical dimension (under the vehicle) to the horizontal dimension (inside the cabin through the pull cord). The actuating assembly with its guide holes and pull cord routing creates a new operational pathway that changes the spatial dimension of the unlocking action.
2Device complexity
If the parking cam is fixed, then the structure is simple, but the service life is short due to insufficient structural flexibility
Solution Approach 1:
The patent transforms the fixed parking cam into a dynamic component that can rotate around the parking guide shaft. The parking cam assembly includes a rotating mechanism with guide holes that allow the cam to move angularly, providing structural flexibility and adapting to operational variations, thereby extending service life.
Solution Approach 2:
The patent separates the parking cam into independent functional elements: the parking cam body, the parking guide shaft, and the rotating mechanism. This segmentation allows each component to perform its specific function while accommodating movement and wear independently, improving overall durability.
3Ease of operation
If the parking mechanism uses only electronic control, then the operation is convenient, but the reliability is insufficient when power is off
Solution Approach 1:
The patent creates a universal parking mechanism that functions in both electronic and mechanical modes. The actuating assembly serves dual purposes: it can be actuated electronically through the control system or manually through the pull cord mechanism. This multi-functionality ensures reliability regardless of power availability.
Solution Approach 2:
The mechanical pull cord system provides self-service capability for unlocking when electronic systems fail. The mechanism uses the vehicle's existing structural elements (guide holes, pull cord routing) to create an autonomous mechanical unlocking pathway that does not depend on external power sources.
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 provides a safe and comfortable mechanical unlocking process without the need to exit the vehicle, ensuring high safety and operational ease while preventing pawl misalignment due to torsion spring failure.
Implementation Method 1
the pull cord assembly is configured to drive the parking guide shaft to translate in an axial direction
Implementation Method 2
a torsion spring failure prevention assembly to maintain functionality in case of spring failure
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
A mechanical unlocking mechanism for electronic parking is provided, which comprises a parking cam assembly, a pawl assembly, a parking gear (17), a pull cord assembly (5) and an actuating assembly. The parking cam assembly comprises a parking guide shaft (11) and a parking cam (13). The parking cam (13) is sleeved on the parking guide shaft (11). The outer side of the parking cam (13) is provided with an arc protrusion along a circumferential direction, so that with the rotation of the parking cam (13), the pawl assembly is in a first position where the parking gear (17) parks in and a second position where the parking gear (17) parks out. One end of the pull cord assembly (5) is connected with the actuating assembly, and the other end of the pull cord assembly (5) is connected with the parking guide shaft (11). The actuating assembly drives, via the pull cord assembly (5), the parking guide shaft (11) to translate, thereby driving the pawl (16) to move from the first position to the second position. The mechanical unlocking mechanism according to the present disclosure provides an emergent mechanical unlocking function when the parking motor is powered off, and the driver can perform manual mechanical unlocking in the cab without getting off the vehicle, so it has high safety and good operation comfort.