Four-Mode Rocker Clutch with Dual Pawl Mode Switching
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Solution Overview
Problem
Known ratcheting clutches lack the desired functionality in providing multiple operational modes efficiently.
Innovation Solution
A four-mode rocker clutch design incorporating a clutch gear, housing, pawls, actuators, and resilient elements that allow for specific modes of operation by controlling the contact and rotation of the clutch gear in different circumferential directions through actuator and resilient element interactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a traditional ratcheting clutch is used, then the structure is simple, but the functionality is limited to basic one-way rotation control
Solution Approach 1:
The clutch is divided into two independent pawl assemblies (first pawl with first actuator, second pawl with second actuator), each capable of independent operation. This segmentation allows the system to achieve four distinct operational modes (first one-way mode, second one-way mode, disconnect mode, locked mode) by selectively engaging or disengaging each pawl, thereby increasing adaptability without requiring a completely new design for each mode.
Solution Approach 2:
The clutch assembly is designed with universal components that can perform multiple functions. The housing contains mounting structures for multiple pawls and actuators, allowing the same basic structure to provide one-way rotation control in different directions, disconnect mode, and locked mode. This multi-functionality approach enables a single clutch assembly to replace what would traditionally require multiple separate devices.
2Adaptability or versatility
If multiple pawls and actuators are added to achieve four-mode operation, then the versatility increases, but the device complexity increases
Solution Approach 1:
Multiple functional elements are merged into a single integrated clutch assembly. The housing combines mounting structures for multiple pawls, actuators, and resilient elements into one unified component. The resilient elements (springs) are integrated into the pawl actuation mechanisms, providing both restoration force and engagement control. This merging reduces the need for separate external components and simplifies the overall system architecture.
Solution Approach 2:
The resilient elements (springs) are configured to automatically restore the pawls to their default positions after actuation. When the actuators pivot the pawls into or out of engagement with the clutch gear, the resilient elements provide the restoring force to return the pawls to their initial state, eliminating the need for additional reset mechanisms or complex control systems.
3Adaptability or versatility
If known ratcheting clutches are used, then the manufacturing is simple, but the desired functionality for multiple operational modes is lacking
Solution Approach 1:
The clutch assembly is segmented into modular sub-assemblies (housing, multiple pawl-actuator-resilient element sets, clutch gear) that can be manufactured independently and then assembled. This modular segmentation allows each component to be optimized for its specific function during manufacturing, while the final assembly provides the complex four-mode functionality. Standardized mounting structures in the housing facilitate straightforward assembly of the modular components.
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 efficient shifting between four distinct modes of operation, including one-way modes, disconnect mode, and locked mode, enhancing the functionality and versatility of the clutch system.
Implementation Method 1
a first resilient element arranged to hold the second pawl out of contact with the clutch gear
Implementation Method 2
the second actuator is arranged to pivot the second pawl into contact with the clutch gear
Data Source
AI summary
A four-mode rocker clutch, including: a clutch gear supported for rotation around an axis of rotation; a housing; a first pawl including a portion disposed within the housing; a first actuator; a second pawl including a portion disposed within the housing; and a first resilient element. For a first one-way mode of the four-mode rocker clutch: the first actuator is arranged to hold the first pawl in contact with the clutch gear; the first pawl is arranged to block rotation of the clutch gear, with respect to the housing, in a first circumferential direction around an axis of rotation; and the first resilient element is arranged to hold the second pawl out of contact with the clutch gear.