Switchable Linear Actuator for One-Way Clutch Torque Control
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Solution Overview
Problem
Current one-way clutch designs in transmissions lack efficient control mechanisms for switching between operating modes, leading to parasitic losses and complexity in traditional hydraulic systems, and there is a need for a more precise and low-loss mechanism for controlling the direction of torque transfer.
Innovation Solution
A switchable linear actuator device with magnetic sources creating net translational forces, using a stator structure with electromagnetic sources and a translator structure with a cam and permanent magnet to pivot a locking member between coupling and uncoupling positions, allowing for electronically-switched magnetic fields and magnetic latching for mode control in radial coupling assemblies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional hydraulic systems are used for control mechanisms, then switching between operating modes is achieved, but parasitic losses and system complexity increase
Solution Approach 1:
The patent replaces traditional hydraulic control systems with an electromechanical control mechanism. A linear actuator with a cam mechanism electronically controls the locking member's position, substituting hydraulic fluid pressure systems with electrical motors and mechanical cam surfaces. This eliminates hydraulic parasitic losses while maintaining mode switching capability between engaged and disengaged states
Solution Approach 2:
The patent extracts and eliminates the hydraulic control system from the transmission assembly, removing the source of parasitic losses. The control mechanism is simplified to an electromechanical linear actuator that directly positions the locking member without requiring hydraulic pumps, valves, or fluid pressure management systems
2Ease of operation
If traditional hydraulic systems are used for control mechanisms, then switching between operating modes is achieved, but system complexity increases
Solution Approach 1:
The patent replaces complex hydraulic control systems with a simplified electromechanical linear actuator. The actuator uses a motor-driven cam mechanism to directly position the locking member, eliminating the need for hydraulic pumps, reservoirs, valves, and fluid management infrastructure. This substitution dramatically reduces system complexity while maintaining full control functionality
Solution Approach 2:
The linear actuator serves multiple functions: it positions the locking member between engaged and disengaged states, provides controlled movement through cam surfaces, and enables mode switching without requiring separate hydraulic control circuits. This multi-functional design consolidates what would traditionally require multiple hydraulic components into a single integrated electromechanical unit
3Measurement precision
If continuous coil energization is used for magnetic latching, then precise control of torque transfer direction is achieved, but energy consumption increases
Solution Approach 1:
The patent employs periodic coil energization to achieve magnetic latching. The coil is energized only during the transition phase to shift the locking member between engaged and disengaged states. Once positioned, the magnetic field is deactivated, and the locking member maintains its position through mechanical retention by the cam surfaces. This periodic action provides precise control while minimizing continuous energy consumption
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
This solution enables near-zero parasitic losses and precise control of torque transfer direction, reducing complexity and energy consumption by using magnetic latching to maintain positions without continuous coil energization, enhancing the efficiency and functionality of one-way clutch systems.
Implementation Method 1
A plurality of magnetic sources are provided to create corresponding magnetic fields to create a net translational force
Implementation Method 2
A stator structure includes at least one electromagnetic source to create an electronically-switched magnetic field
Implementation Method 3
The net translational force comprises a first translational force caused by energization of the at least one electromagnetic source and a magnetic latching force based upon linear position of the permanent magnet source along the axis
Data Source
AI summary
Overrunning, non-friction coupling and control assemblies, a switchable linear actuator device and a reciprocating electromechanical apparatus for use in the assemblies are provided. The device and apparatus control the operating mode of at least one non-friction coupling assembly. The device and apparatus have a plurality of magnetic sources which produce corresponding magnetic fields to create a net translational force. The net translational force comprises a first translational force caused by energization of at least one electromagnetic source and a magnetic latching force based upon linear position of a permanent magnet source along an axis. One or more cams are utilized to control whether a locking member either couples or uncouples its corresponding coupling assembly.