Selectable One-Way Clutch Protector Plate Drag Torque
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Solution Overview
Problem
Conventional selectable one-way clutches experience undesirable engagement due to drag torque from lubricating oil, particularly at low temperatures, leading to unintentional rotation of the selector plate and potential misalignment with the notch plate.
Innovation Solution
Incorporation of a protector plate fixed between the rotary and selector plates, featuring a second aperture matching the strut's dimensions and a slit for oil flow, along with a protrusion to prevent unintentional rotation and ensure smooth operation between engagement and disengagement modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If lubrication oil is applied between the fixed plate and the rotary plate to reduce friction, then friction is reduced and smooth rotation is enabled, but drag torque or shearing force is generated that may undesirably rotate the selector plate when the pocket plate is halted
Solution Approach 1:
A protector plate is introduced as an intermediary component between the rotary plate and the selector plate. This protector plate has a through-hole that allows the strut to pass through, but blocks the transmission of drag torque from the rotary plate to the selector plate. The mediator structure enables the selector plate to be protected from harmful fluid forces while still allowing necessary mechanical interactions through the strut aperture.
2Reliability
If viscosity of the oil is increased to improve lubrication, then friction reduction is enhanced, but drag torque on the selector plate increases leading to accidental engagement at low temperatures
Solution Approach 1:
The protector plate serves as a physical barrier that intercepts and blocks the transmission of oil-induced drag torque to the selector plate. By positioning the protector plate between the rotary plate and selector plate, the system can maintain high oil viscosity for effective lubrication without transmitting the associated harmful drag forces to the selector mechanism.
3Ease of operation
If the selector plate is made more sensitive to enable precise mode switching, then operational control is improved, but the selector plate becomes more susceptible to rotation from drag torque
Solution Approach 1:
The protector plate with its strategically positioned through-hole creates a mechanical shield that prevents unwanted rotation of the selector plate while allowing the strut to freely pass through for intentional mode switching. This mediator structure enables precise operational control without the selector plate being overly sensitive to external drag forces.
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
Prevents unintended engagement by shielding the selector plate from drag torque, ensuring proper operational mode switching and maintaining smooth rotation, while also reducing oil temperature and preventing excessive oil application.
Implementation Method 1
a lubricating oil that is applied between the fixed plate and the rotary plate
Implementation Method 2
a drag torque resulting from rotation of the rotary plate applied thereto through the oil
Data Source
AI summary
A selectable one-way clutch that can prevent unintentional rotation of a selector plate by a drag torque is provided. In the selectable one-way clutch, a selector plate having a first aperture for letting through a strut is interposed between a fixed plate and a rotary plate while being allowed to rotate between an engagement position and a disengagement position. The selectable one-way clutch comprises: a protector plate interposed between the rotary plate and the selector plate; and a second aperture formed on the protector plate to let through the strut when the selector plate is rotated to the engagement position.