Transmission Actuation Assembly Using One-Way Clutches for Park Lock
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Vehicle transmissions face spatial constraints and performance demands, necessitating a reduction in components while maintaining multi-speed shifting and park lock functionality, and improving space and energy efficiency of actuators.
Innovation Solution
An actuation assembly with a first and second cam device idly coupled to a support shaft, driven by opposing one-way clutches through an idler gear, allowing a single actuator to perform gear shifting and park lock functions, reducing component count and complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate actuators are used for clutch shifting and park lock functionality, then each function can be independently actuated, but the number of components increases and space efficiency decreases
Solution Approach 1:
A single actuator is designed to perform multiple functions by sequentially actuating different cam devices. The actuator can rotate the first cam device for clutch shifting operations and the second cam device for park lock operations, thereby eliminating the need for separate actuators while maintaining independent actuation capability for each function.
Solution Approach 2:
The system uses a dynamically configurable cam mechanism where the relationship between the actuator and cam devices can be changed through one-way clutches. This allows the same actuator to dynamically switch between controlling different cam devices based on operational requirements, enabling one actuator to replace multiple fixed-function actuators.
2Reliability
If multiple cam devices are actuated by separate actuators, then each cam device can be optimized for its specific function, but the overall transmission size increases
Solution Approach 1:
Multiple cam devices that were previously actuated by separate actuators are merged into a single actuation system. The first cam device for clutch shifting and the second cam device for park lock are both driven by one actuator through a shared transmission path involving the idler gear and one-way clutches, reducing the overall transmission volume while maintaining function-specific optimization.
Solution Approach 2:
The cam devices are arranged in a nested or compact configuration where the second cam device can be positioned within or adjacent to the first cam device's operational space. This nesting approach allows both cam devices to share the same actuator and spatial envelope, reducing the overall transmission size while maintaining independent actuation 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
The actuation assembly achieves compact, less complex, and energy-efficient transmission operation by utilizing one actuator to drive two cam devices in opposing directions, enhancing transmission functionality.
Implementation Method 1
a first one-way clutch coupled to the first cam device and an idler gear that is rotationally coupled to an actuator; and a second one-way clutch coupled to the second cam device and the idler gear that is rotationally coupled to the actuator; wherein the first and second one-way clutches drive the first and second cam devices in opposing rotational directions
Data Source
AI summary
A system and method for an actuation assembly for a transmission. The actuation assembly, in one example, includes a first cam device that is idly coupled to a support shaft and a second cam device idly coupled to the support shaft. The actuation assembly further includes a first one-way clutch which is coupled to the first cam device and an idler gear that is rotationally coupled to an actuator and a second one-way clutch that is coupled to the second cam device and the idler gear that is rotationally coupled to the actuator.