Park Lock Pawl Mechanism With Self-Locking Cone Actuation
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Solution Overview
Problem
Existing parking-lock mechanisms for electric vehicles are mechanically complex and require sophisticated designs to provide a reliable and simple form-fitting locking of the drive shaft to the drive wheel, which complicates the system and hinders fault monitoring.
Innovation Solution
A parking-lock mechanism with a blocking region, a pivotable pawl, and a self-locking actuator that engages and disengages from a blocking wheel, utilizing a decoupling spring device and a freely rotatable blocking-cone lever to simplify the construction and ensure precise control, allowing for easy monitoring of the locking state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional parking-lock mechanism is used, then the drive shaft can be locked, but the mechanical complexity increases
Solution Approach 1:
The patent extracts and eliminates the blocking-cone lever from the force transmission path between the actuator and the pawl. By using a decoupling spring device, the force transmission is directened, removing unnecessary mechanical components and simplifying the overall structure while maintaining reliable locking function.
Solution Approach 2:
The patent segments the force transmission function by introducing a decoupling spring device that separates the actuator shaft from the pawl actuation mechanism. This segmentation allows independent optimization of each component and reduces the need for complex mechanical linkages.
2Measurement precision
If additional latching mechanisms are added to ensure precise control, then the control precision improves, but the device complexity increases
Solution Approach 1:
The patent employs a self-locking actuator that inherently maintains its position without requiring additional latching mechanisms. The actuator's self-locking capability provides precise control through its own internal mechanism, eliminating the need for external latching components and reducing overall system complexity.
3Reliability
If a complex mechanism is used to provide reliable locking, then the locking reliability improves, but the ease of operation deteriorates
Solution Approach 1:
By removing the blocking-cone lever and intermediate transmission elements, the patent creates a more direct and observable force transmission path from the actuator to the pawl. This simplification makes it easier to monitor the locking state and detect faults, as there are fewer components that could fail or malfunction.
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 simpler, more reliable, and fault-tolerant parking-lock mechanism that reduces mechanical complexity, ensures precise control, and enhances fault monitoring by eliminating the need for additional latching mechanisms, while maintaining the drive shaft's rotational capability for driving modes.
Implementation Method 1
The parking-lock mechanism has a pawl spring device, which preloads the parking-lock pawl into the driving position
Implementation Method 2
provision is made of a decoupling spring device with a decoupling spring for transmission of an actuation force from the pawl actuator to the pawl cone
Implementation Method 3
The pawl actuator is in the form of a self-locking actuator, this being understood as meaning that, with the pawl actuator deactivated, the position of the pawl actuator shaft is maintained without energy
Data Source
AI summary
A park lock mechanism for a motor vehicle includes a park lock pawl for selectively forming a form-locking connection to a lock region, the park lock mechanism having a locking mode, in which the park lock pawl is moved into a locking position, and a driving mode, in which the park lock pawl is moved into a driving position. The park lock pawl is pivotable about a pawl axis from the locking position into the driving position. A locking pawl spring device preloads the park lock pawl into the driving position. A locking pawl actuation device has a locking pawl actuator with a locking pawl actuator shaft and has a locking pawl cone, the locking pawl cone being movable along a cone axis by the locking pawl actuator. The cone axis is parallel to the pawl axis. The locking pawl cone is movable along the cone axis between a cone driving position and a cone locking position. The parking lock pawl is forced into the locking position against the preload of the locking pawl spring device by the locking pawl cone in the cone locking position. A locking cone lever is provided for moving the locking pawl cone along the cone axis, the locking cone lever being freely rotatable by the locking pawl actuator shaft.