Multi-Pawl Park Lock Actuation for Selective Gear Wheel Locking
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Solution Overview
Problem
Existing park lock technologies do not effectively address the need for a reliable and efficient mechanism to prevent rotation of multiple gear wheels using a cable-actuated system, particularly in applications requiring precise control and engagement/disengagement mechanisms.
Innovation Solution
A cable actuated multi-pawl park lock system comprising an actuator connected to multiple park lock devices via cables, utilizing a displaceable plate, lock mechanisms with teeth, and slidable connectors, driven by an electric motor to control the engagement and disengagement of gear wheels through threaded shafts and push-pull cables.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a cable actuated system is used to prevent rotation of multiple gear wheels, then the ease of operation and control is improved, but the device complexity increases due to multiple cables and park lock devices
Solution Approach 1:
The actuator is designed to perform multiple functions by controlling multiple park lock devices through a single unit. The actuator housing contains multiple actuators that can independently control different park lock devices, allowing one component to serve multiple purposes and reducing the need for separate control mechanisms for each gear wheel.
Solution Approach 2:
The park lock system is divided into multiple independent park lock devices, each with its own cable connection but controlled through a unified actuator system. This segmentation allows each park lock device to independently engage or disengage specific gear wheels, providing precise control while maintaining system modularity.
2Adaptability or versatility
If multiple park lock devices are used to selectively prevent rotation of different gear wheels, then the adaptability is improved, but the device complexity increases
Solution Approach 1:
The park lock devices are designed with movable components that can dynamically engage or disengage from gear wheels based on actuator position. The slidable connectors and movable park lock teeth allow the system to adapt its configuration, enabling selective prevention of rotation for different gear wheels as needed without requiring a completely different mechanism for each scenario.
Solution Approach 2:
Multiple park lock devices are integrated into a single system controlled by one actuator, allowing the same hardware configuration to provide selective engagement for different gear wheels. This multi-functional design enables the system to adapt to various operational requirements without increasing the number of separate control units.
3Manufacturing precision
If a displaceable plate with push-pull cables is used to engage and disengage park lock teeth, then the precision of engagement is improved, but the manufacturing complexity increases
Solution Approach 1:
The displaceable plate serves as an intermediary component that translates the rotational motion of the actuator into linear displacement, which then actuates the push-pull cables. This intermediary mechanism provides precise control over the engagement and disengagement of park lock teeth by converting rotational actuator movement into controlled linear cable tension, ensuring accurate positioning without requiring complex direct actuation mechanisms.
Solution Approach 2:
The system replaces direct mechanical linkages with a cable-based actuation mechanism. Instead of using rigid mechanical connections between the actuator and park lock devices, flexible cables transmit force, allowing for simpler manufacturing of individual components while maintaining precise engagement through cable tension control.
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 system provides precise control over the rotation of multiple gear wheels, ensuring reliable engagement and disengagement, enhancing the operational efficiency and reliability of the park lock mechanism.
Implementation Method 1
an electric motor arranged to rotate the threaded shaft
Implementation Method 2
the actuator also includes a threaded shaft with an axis and an electric motor arranged to rotate the threaded shaft. The displaceable plate is threaded onto the threaded shaft, the displaceable plate is arranged to displace in a first axial direction when the electric motor rotates the shaft in a first rotational direction
Implementation Method 3
a first cable connecting the actuator to the first park lock device, a second cable connecting the actuator to the second park lock device
Data Source
AI summary
A cable actuated multi-pawl park lock includes an actuator, a first park lock device arranged for engaging a first gear wheel, a first cable connecting the actuator to the first park lock device, a second park lock device arranged for engaging a second gear wheel, and a second cable connecting the actuator to the second park lock device. In some example embodiments, the actuator includes an actuator housing, the first park lock device includes a first park lock housing, the first cable includes a first outer jacket having a first end fixed to the actuator housing and a second end fixed to the first park lock housing, the second park lock device includes a second park lock housing, and the second cable includes a second outer jacket having a first end fixed to the actuator housing and a second end fixed to the second park lock housing.