Selectable One-Way Clutch Shutter Plate Mechanism
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional selectable one-way clutches suffer damage when the notch plate is rotated at high speeds due to repeated contact between the strut and the notch plate, leading to potential damage to the struts and notch plate, especially when the strut is pushed up by a spring and brought into contact with the notch's opening edge.
Innovation Solution
A selectable one-way clutch design featuring a shutter plate that moves radially outward to close the notch when the notch plate exceeds a predetermined speed, preventing the strut from entering the notch and thus reducing contact and potential damage, utilizing a second elastic member to counteract centrifugal forces and control the shutter plate's movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the number of struts is reduced to limit damage on the notch plate, then the damage on the notch plate is limited, but each backlash between the struts is increased and impact caused by engagement is increased
Solution Approach 1:
A shutter plate is introduced as an intermediary component between the strut and the notch plate. The shutter plate selectively blocks the notch opening to prevent harmful repeated contact between the strut and notch plate during overrunning, while allowing torque transmission when needed. This mediator resolves the contradiction by protecting the notch plate without requiring reduction of strut number, thus maintaining engagement precision.
2Power
If the strut is pushed up by a spring to enable engagement, then torque transmission is enabled, but repeated contact between the strut and notch plate during high-speed rotation causes damage
Solution Approach 1:
The shutter plate is designed to dynamically respond to rotational speed changes. During normal operation, the spring pushes the strut into engagement. During high-speed overrunning, centrifugal force moves the shutter plate to block the notch, preventing harmful repeated contact. This dynamic adjustment resolves the contradiction between maintaining torque transmission capability and ensuring component durability under different operating conditions.
Solution Approach 2:
The shutter plate performs preliminary protective action by blocking the notch opening before harmful repeated contact can occur during high-speed overrunning. The centrifugal force automatically activates the shutter plate to prevent the damaging interaction between the spring-pushed strut and the notch plate, thereby protecting components before damage can accumulate.
3Ease of operation
If the notch plate is allowed to rotate freely in the overrunning direction, then smooth operation is achieved, but the strut is repeatedly brought into contact with the opening edge causing damage
Solution Approach 1:
The shutter plate serves as a mediator that selectively controls access to the notch opening. During overrunning, it blocks the opening to prevent harmful repeated contact between the strut and notch plate, while still allowing the notch plate to rotate smoothly. This resolves the contradiction by introducing a protective barrier that eliminates damage while maintaining smooth operational characteristics.
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 damage to components by preventing repeated contact between the strut and the notch plate during high-speed rotation, maintaining effective torque transmission while minimizing wear and impact noise, without the need to reduce the number of struts or increase backlash.
Implementation Method 1
a second elastic member that pushes the shutter plate radially inwardly to open the notch
Implementation Method 2
the shutter plate is adapted to be moved radially outwardly when an elastic force of the second elastic member is overwhelmed by a centrifugal force resulting from a rotation of the second plate
Implementation Method 3
a first elastic member that pushes the leading end of the strut toward the notch to bring the strut into engagement with an engagement wall of the notch
Data Source
AI summary
A selectable one-way clutch that can limit damage on components in an overrunning mode is provided. The selectable one-way clutch comprises a shutter plate arranged in a notch plate. The shutter plate is moved radially outwardly by a centrifugal force resulting from a rotation of the notch plate to prevent an entrance of the leading end of a strut into a notch.