Parking Lock Cam Actuation with Limited Angular Range
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Solution Overview
Problem
Existing parking lock arrangements for motor vehicle transmissions require a large angular range for actuation, which can limit the use of space for other transmission functions and complicate the design, especially when the actuator is spatially close to the locking arrangement.
Innovation Solution
A parking lock arrangement utilizing a cam with a limited peripheral actuation area, typically less than 180°, coupled with a pivotally mounted lever that converts small rotations into large translational movements, allowing the actuator to be positioned far from the locking arrangement and enabling efficient use of space for other transmission functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional actuating arrangement with a cam is used to actuate the parking lock, then the parking lock can be reliably engaged and disengaged, but the cam requires a large angular range (typically more than 180°) for actuation, which limits space for other transmission functions and complicates the design
Solution Approach 1:
The cam is segmented into two distinct functional areas: a first peripheral area (extending over less than 180°, typically 60°-120°) that contains the actuating cam section for parking lock engagement/disengagement, and a second peripheral area that provides a neutral zone where the driver does not interact with the cam profile. This segmentation allows the parking lock actuation to be completed within a limited angular range, reducing the overall angular requirement and simplifying the actuating arrangement design while maintaining reliable operation
Solution Approach 2:
The invention introduces a radial dimension to the actuation mechanism by positioning the driver radially offset from the cam rotation axis. The driver is guided radially inward by the actuating cam section during actuation, converting rotational motion into combined radial and tangential motion. This dimensional approach allows effective parking lock actuation within a smaller angular range compared to conventional cam designs that rely solely on tangential motion
2Volume of moving object
If the actuator is positioned close to the locking arrangement, then the actuation mechanism can be compact, but the large angular range required by conventional cams limits the available space for other transmission functions
Solution Approach 1:
By segmenting the cam into distinct functional areas with the actuating section confined to less than 180° of rotation, the invention reduces the angular footprint required for parking lock actuation. This allows the actuator to be positioned closer to the locking arrangement while leaving sufficient angular space in the remaining cam perimeter for other transmission functions such as gear shifting operations
Solution Approach 2:
The invention uses only the minimum necessary angular range (less than 180°) for parking lock actuation by concentrating the actuating cam section in a limited peripheral area. The remaining angular range provides excess space that can be utilized for other transmission functions, effectively allowing the system to perform parking lock actuation with partial use of the cam's rotational 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
This design allows for a compact and efficient parking lock arrangement that can be actuated using a small angular range, effectively bridging large distances between the actuator and the locking mechanism without interfering with other transmission functions, enhancing the overall design and functionality.
Implementation Method 1
a cam (44) which is mounted on the housing (42) and can be driven about an axis of rotation (46) and which has an actuating cam section (47) which extends over a first peripheral area (48) of the cam (44)
Implementation Method 2
a lever (56) which is pivotally mounted on the housing (42) and which is coupled to the locking arrangement (32), the lever (56) being connected to a driver (64)
Data Source
Figure 1
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Figure 5~8
AI summary
Parking lock arrangement (30) for a motor vehicle transmission (16), comprising a locking arrangement (32) that can be actuated between a release position (FP) and a locking position (SP), wherein the locking arrangement (32) is configured to immobilize a motor vehicle in the locking position (SP), and comprising an actuating arrangement (40) for actuating the locking arrangement, characterized in that the actuating arrangement comprises: a housing (42), a cam disk (44) that is mounted and driven about a pivot axis (46) on the housing (42) and that has an actuating cam section (47) extending over a first circumferential region (48) of the cam disk (44) that is greater than 5° and less than 180°, and a lever (56) that is pivotably mounted on the housing (42) and coupled to the locking arrangement (32), wherein the lever (56) is connected to a driver (64) that is connected to the cam disk (44) is coupled, in such a way,that the driver (64) is carried along by the actuating cam section (47) when the cam disk (44) is rotated, such that the lever is pivoted to actuate the locking arrangement (32).