Parking Lock Cam Mechanism for Manual Release Failure Recovery
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Solution Overview
Problem
Existing vehicular parking lock mechanisms fail to reliably release the parking locked state when there are abnormalities in the electrically controlled actuator or transmission path, leading to manual operation inefficiencies and potential vehicle immobilization.
Innovation Solution
A vehicular parking lock mechanism with a cam mechanism that includes a cam protrusion on the parking pole and a cam engaging portion on the lock member, allowing for manual release via a lock releasing member that moves the second parking pole member from a normal to a manually released position, disengaging the meshing portion from the parking gear, even in cases of actuator or transmission path failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the lock member is mechanically reciprocated by a shift lever via a detent plate, then the parking locked state can be released manually, but the parking locked state cannot be released when there is an abnormality in the transmission path from the shift lever to the lock member
Solution Approach 1:
The parking pole is segmented into two members, allowing the lock releasing member to directly operate the second parking pole member independently of the shift lever transmission path, ensuring manual release capability even when the shift lever transmission path is abnormal.
Solution Approach 2:
The cam protrusion and cam engaging portion mechanism is extracted from the lock member and placed on the parking pole members. This allows the lock releasing member to directly disengage the cam mechanism without relying on the shift lever transmission path to the lock member.
2Reliability
If a lock releasing member is provided in the electrically controlled actuator, then manual release is possible when the actuator is abnormal, but the device size and complexity increase
Solution Approach 1:
The parking pole is divided into two members, with the cam protrusion placed on the second parking pole member. The lock releasing member simply moves the second parking pole member to disengage the cam mechanism, avoiding the need to integrate a complex lock releasing mechanism into the actuator itself.
Solution Approach 2:
The cam release mechanism is extracted from the actuator and implemented through the two parking pole members and lock releasing member. This separates the manual release function from the actuator structure, maintaining actuator simplicity while enabling manual release capability.
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 manual release of the parking locked state without increasing the size or complexity of the actuator, maintaining ease of installation and operation, and allowing for smooth switching between locked and released states.
Implementation Method 1
the lock member being configured to move the parking pole closer to the parking gear and inhibit rotation of the parking gear, via a cam mechanism, when the lock member is moved to the locking position
Implementation Method 2
a meshing portion configured to mesh with the parking gear, the parking pole being movable closer to and away from the parking gear, and configured to inhibit rotation of the parking gear when the meshing portion is engaged with the parking gear
Data Source
AI summary
A vehicular parking lock mechanism includes a parking gear, a parking pole, a lock member, and a lock releasing member. The parking pole includes a first parking pole member having a meshing tooth, and a second parking pole member having a cam protrusion. When the lock releasing member is pulled in one direction, and the second parking pole member is moved to a manually released position, the cam protrusion is disengaged from a second roller of the lock member, and the meshing tooth of the first parking pole member comes out of the parking gear, so that the parking lock mechanism is released from the parking locked state.