Switchable Clutch Mode Transition via Rotating Cage
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Solution Overview
Problem
Existing clutches lack the ability to seamlessly transition between a one-way mode and a fully locked mode, limiting their versatility in coupling rotating components in motor vehicles.
Innovation Solution
A clutch design featuring an outer race with pawls having first and second arms, a radially disposed cage that rotates to switch between modes, and resilient members to engage the teeth, allowing the clutch to pivot between one-way and fully locked modes by actuating the pawls between different positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a clutch is designed to operate in only one mode (one-way or fully locked), then the design is simple and reliable, but the adaptability to different operating conditions is limited
Solution Approach 1:
The clutch design incorporates a rotatable cage that can dynamically switch between two operational modes: one-way mode and fully locked mode. The cage's rotation changes the engagement state of the pawls with the teeth, allowing the clutch to adapt its locking characteristics based on operational requirements without changing the physical structure
Solution Approach 2:
The clutch mechanism achieves multi-functionality by enabling a single device to perform both one-way coupling and bidirectional locking functions. The pawls are designed with dual capabilities: they can engage with the teeth in a first direction to provide one-way locking, and when actuated by the cage rotation, they can engage in both directions to provide full locking, eliminating the need for separate clutch mechanisms
2Ease of operation
If the cage rotates to switch between modes, then the clutch can transition seamlessly between one-way and fully locked modes, but the mechanism complexity increases
Solution Approach 1:
The cage incorporates resilient members that automatically urge the pawls into engagement with the teeth when the cage rotates to the fully locked position. This self-actuating mechanism eliminates the need for external actuators or complex control systems, as the rotation of the cage itself triggers the mode transition through the pre-positioned resilient members
Solution Approach 2:
The design combines the mode-switching function and the locking function into a single integrated mechanism. The rotation of the cage simultaneously performs both operations: it repositions the pawls for mode selection and triggers their engagement through the resilient members, consolidating multiple functions into one motion
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 and reliable coupling of rotating components in both directions in fully locked mode and unidirectional locking in one-way mode, enhancing the clutch's adaptability in vehicle applications such as automatic transmissions and powertrains.
Implementation Method 1
resilient members each configured to urge an associated one of the second arms into engagement with the teeth when the cage is in a second rotational position to put the clutch in the one-way mode
Implementation Method 2
ramps each configured to urge an associated one of the first arms into engagement with the teeth when the cage is in a first rotational position to put the clutch in the fully locked mode
Data Source
AI summary
A clutch includes an outer race including pawls each having first and second arms and an inner race including teeth engageable with the pawls. A cage is radially disposed between the inner and outer races and is rotatable relative to the pawls to switch the clutch between a one-way mode and a fully locked mode. The cage includes ramps each configured to urge an associated one of the first arms into engagement with the teeth when the cage is in a first rotational position to put the clutch in the fully locked mode and resilient members each configured to urge an associated one of the second arms into engagement with the teeth when the cage is in a second rotational position to put the clutch in the one-way mode.