Electromagnetic Selectable One-Way Clutch with Integrated Lead Frame
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Solution Overview
Problem
Conventional one-way clutches in automatic transmissions lack independent control over their modes of operation, being either locked or freewheeling based on the direction of drive torque, which limits their functionality in modern transmissions requiring controllable overrunning coupling devices.
Innovation Solution
A selectable one-way clutch assembly with an outer race and inner race featuring ratchet teeth, an active strut pivotably supported by the outer race, and an electromagnetic actuator that can be selectively energized to pivot from an unlocked to a locked position, allowing for controlled engagement with the ratchet teeth during rotation, integrated with a lead frame assembly for improved packaging and reduced wiring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional passive one-way clutch is used, then the structure is simple and reliable, but the device lacks independent control capability and cannot provide selectable operational modes
Solution Approach 1:
The patent combines a passive one-way clutch mechanism with an electromagnetic actuator assembly into a single integrated selectable one-way clutch. The passive clutch provides automatic locking in one direction while the electromagnetic actuator enables controlled locking in the opposite direction, merging automatic and controllable functions into one device.
Solution Approach 2:
The selectable one-way clutch is designed to provide multiple operational modes: automatic freewheeling in both directions, controlled locking in either direction, and selective engagement/disengagement. This multi-functionality allows the single device to replace both passive one-way clutches and traditional multi-plate clutches in automatic transmissions.
2Adaptability or versatility
If a selectable one-way clutch with electromagnetic actuator is implemented, then controllable operational modes are achieved, but the device complexity increases
Solution Approach 1:
The lead frame assembly integrates multiple electrical connections, control circuits, and grounding paths into a single compact structure that attaches to the electromagnetic actuator. This consolidation reduces the number of separate wiring harnesses and connection points, thereby reducing overall device complexity despite the added functionality.
Solution Approach 2:
The electromagnetic actuator assembly is designed to perform multiple functions: actuating the clutch plates for engagement/disengagement, providing electrical connections to the control system, and serving as a mounting structure for the lead frame. This multi-functionality reduces the need for separate components.
3Area of stationary object
If separate wiring and control systems are used for the electromagnetic actuator, then electrical connections are reliable, but packaging efficiency is reduced and wiring complexity increases
Solution Approach 1:
The lead frame assembly merges electrical wiring, connection terminals, and control circuitry into a single integrated structure that attaches directly to the electromagnetic actuator. This eliminates the need for separate wiring harnesses and reduces the space required for electrical connections.
Solution Approach 2:
The lead frame assembly is designed to nest within or attach to the electromagnetic actuator housing, with electrical connections routed through the actuator structure itself. This nested arrangement minimizes the overall packaging volume and reduces external wiring requirements.
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 bidirectional control of torque transmission, allowing the clutch to freewheel in both directions until actuated, providing enhanced operational modes and improved packaging efficiency in automatic transmissions.
Implementation Method 1
at least one electromagnetic actuator selectively energized for effectuating pivoting of the active strut from an unlocked position wherein the active strut is disengaged from the outer ratchet teeth to a locked position for engaging one of the plurality of outer ratchet teeth
Data Source
AI summary
A clutch assembly includes an outer race presenting a plurality of outer ratchet teeth and an inner race presenting a plurality of outer ratchet teeth. A selectable one-way clutch includes at least one active strut pivotably supported by the outer race and at least one electromagnetic actuator. The electromagnetic actuator is selectively energized for effectuating pivoting of the active strut from an unlocked position wherein the active strut is disengaged from the outer ratchet teeth to a locked position for engaging one of the plurality of outer ratchet teeth during rotation of the inner race. The clutch assembly includes a lead frame assembly attached to the outer race and electrically connected to the at least one electromagnetic actuator for controlling selective energization of the at least one electromagnetic actuator.