Switchable One-Way Clutch Selector Bracket Design
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Solution Overview
Problem
Existing one-way clutches lack the ability to selectively switch between locked and free-wheel states in both clockwise and counterclockwise directions, limiting their versatility and efficiency in transmission systems.
Innovation Solution
A switchable one-way clutch assembly featuring a selector bracket assembly with axially extending posts, radially outward tabs, and circumferentially extending bracket springs, along with an actuator pin that disengages to allow free-wheeling in one direction and engages to lock in both directions, utilizing rollers and roller springs to manage torque and dampening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a traditional one-way clutch is used, then it allows free-wheeling in one direction, but it cannot be selectively locked in both clockwise and counterclockwise directions
Solution Approach 1:
The clutch assembly is divided into two independent one-way clutch mechanisms (first and second outer races with respective inner races and rollers), each capable of independent directional control. This segmentation allows the system to achieve bi-directional locking capability while maintaining the simplicity of individual one-way clutch units.
Solution Approach 2:
The selector bracket assembly is designed to be dynamically positionable between different angular orientations (first and second positions), enabling selective engagement of either the first or second one-way clutch mechanism. This dynamic positioning capability allows the system to switch between different locking states based on operational requirements.
2Productivity
If the clutch is locked in both directions, then torque transfer is efficient, but the clutch cannot free-wheel
Solution Approach 1:
The actuator pin is designed to be dynamically positionable between engaged and disengaged states, allowing the system to switch between locked and free-wheeling conditions. When disengaged, the one-way clutch mechanisms allow free-wheeling; when engaged, they provide locked torque transfer, thus achieving both capabilities through dynamic state changes.
Solution Approach 2:
The one-way clutch mechanisms automatically provide free-wheeling capability in their respective directions when not actively locked by the actuator pin. The rollers and roller springs self-adjust to allow free rotation in the free-wheeling direction without requiring additional active control, thus maintaining versatility while enabling efficient torque transfer when needed.
3Stability of the object's composition
If the selector bracket is held in position by springs, then it returns to neutral state, but additional components increase complexity
Solution Approach 1:
The circumferentially extending bracket springs are designed to automatically return the selector bracket to its neutral position after actuation, without requiring additional reset mechanisms or complex control systems. The springs self-regulate the bracket's position based on the actuator's movement, providing stable neutral positioning through the inherent mechanical properties of the spring elements already integrated into the assembly.
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 the clutch to seamlessly transition between locked and free-wheel states in both clockwise and counterclockwise directions, enhancing the clutch's versatility and reducing noise and torque reversal impacts, while maintaining efficient torque transfer.
Implementation Method 1
a plurality of circumferentially extending bracket springs adjacent to the plurality of radially outward extending tabs, wherein the bracket springs are arranged for pushing the selector bracket in a clockwise direction
Implementation Method 2
a first plurality of rollers and a first plurality of roller springs disposed between the first inner race and the first outer race
Implementation Method 3
reducing noise and torque reversal impacts
Data Source
AI summary
A selector bracket assembly for a one way clutch assembly comprising an annular body portion having: first and second radial surfaces; an inner circumferential surface, connecting the first and second radial surfaces; at least one cutout portion; at least one axially extending post adjacent to the at least one cutout portion; and, an outer circumferential surface including a plurality of radially outward extending tabs; and, at least one actuator pin disposed radially outward of the inner circumferential surface and arranged for engagement with the selector bracket assembly to lock a one way clutch. A switchable one way clutch assembly having said selector bracket, or at least two selector brackets for making selectable the following states: free wheel or locked in both the first and second opposing circumferential directions; locked in first and free wheel in second circumferential direction; and, free wheel in first and locked in second circumferential direction.