Parking Interlock Manual Release Actuating Device
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Solution Overview
Problem
Existing actuating devices for manual release of parking lock devices in automatic transmissions are prone to undesirable interactions and potential damage due to improper manual actuation, and they may not function without hydraulic pressure or a power supply, posing risks during emergencies or vehicle malfunctions.
Innovation Solution
A decoupled actuating device with a pivotably mounted actuating shaft and an engaging lever that allows manual release of the parking lock without moving with the internal automatic switching operations, featuring an overload spring to prevent damage and ensure safe operation, and a slim design to minimize external influences and contamination risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the actuating device is rigidly connected to the parking lock device, then the manual actuator can reliably release the parking lock, but the actuating device moves with internal automatic switching operations causing contamination risks and potential damage
Solution Approach 1:
The actuating device is divided into two independent parts: the manual actuator positioned outside the transmission housing and the parking lock mechanism inside the housing. The actuating shaft penetrates the housing wall to connect these parts, allowing manual operation without direct rigid connection between external and internal components. This segmentation isolates the internal parking lock from external contamination while maintaining manual release capability.
Solution Approach 2:
The actuating shaft serves as an intermediary element that transmits manual actuation forces from the external manual actuator to the internal parking lock mechanism without creating a rigid direct connection. This intermediary allows force transmission while preventing the manual actuator from moving with internal automatic switching operations, thereby reducing contamination risks.
2Object-affected harmful factors
If the manual actuator is positioned outside the transmission housing, then external influences are reduced, but the actuating device cannot function without hydraulic pressure or power supply during emergencies
Solution Approach 1:
The actuating device replaces hydraulic or electric actuation systems with a purely mechanical manual actuator. The manual actuator can be operated directly by the driver without requiring hydraulic pressure or electrical power supply, enabling emergency manual release of the parking lock even when these systems fail. This mechanical substitution ensures adaptability to power-free emergency situations.
3Object-affected harmful factors
If the engaging lever is designed with a slim profile, then external friction and contamination are minimized, but the connection between the manual actuator and parking lock mechanism is weakened
Solution Approach 1:
The engaging lever is designed with a slim profile along its length to minimize external friction and contamination exposure, but features a enlarged head section with a projection that engages into the parking disk recess. This local quality variation maintains structural strength at the critical engagement point while preserving the slim profile elsewhere to reduce friction.
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 safe and reliable manual release of the parking lock device without hydraulic pressure or power supply, preventing damage to internal components and ensuring the parking lock functions correctly even in emergency situations.
Implementation Method 1
an overload spring which is designed for preventing an overloading of the parking lock mechanism in the event of an excessive manual actuation of the manual actuator
Implementation Method 2
An engaging piece, which includes a projection engaging into the recess of the parking disk, is mounted on the parking disk. The engaging piece is designed as an engaging lever which includes a foot section, with the aid of which the engaging lever is mounted on the shaft inner section of the actuating shaft
Implementation Method 3
a pivotably mounted actuating shaft penetrating a housing wall of the transmission housing
Data Source
AI summary
An actuating device (19) for manually releasing a parking lock device (9) of a transmission (1) includes a manual actuator (18) and a pivotably mounted actuating shaft (20). The actuating shaft (20) includes a shaft outer section (20a), to which the manual actuator (18) is attached, and includes a shaft inner section (20b), on which a parking disk (15) is mounted. The parking disk (15) includes a recess (21), and on which an engaging piece is mounted, which includes a projection (23) engaging into the recess (21). The engaging piece is an engaging lever (22) which includes a foot section (22a) for mounting the engaging lever (22) on the shaft inner section (20b) of the actuating shaft (20), and includes the projection (23) on a head section (22b) positioned opposite a foot section (22a). An associated parking lock device (9), transmission (1), and assembly method are also provided.