One-Way Clutch Fixation Structure for Selective Engagement
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Solution Overview
Problem
Existing selectable one-way clutches experience engagement delays and imperfect engagement due to end play between spline ridges and grooves, leading to uneven contact and torque transmission issues.
Innovation Solution
A fixation structure for the one-way clutch is introduced, featuring a pocket plate with a strut that projects from a pocket, a selector plate with apertures, and a stationary member with an engagement portion on its back face, which is radially closer to the rotational axis than the strut, preventing rotation and ensuring precise engagement through leverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the one-way clutch is fixed by engaging spline ridges with spline grooves, then the clutch can be selectively engaged depending on torque direction, but end play between the spline ridge and groove causes engagement delay and uneven contact
Solution Approach 1:
The strut is pre-positioned to project from the pocket plate before engagement occurs. This preliminary positioning ensures that when the selector plate rotates, the strut is already in the correct position to engage with the notch plate without delay, eliminating the engagement timing issues caused by end play in the spline connection.
Solution Approach 2:
The strut acts as an intermediary element between the pocket plate and notch plate. It transfers the rotational motion from the selector plate to the notch plate through controlled engagement, ensuring smooth and timely torque transmission while eliminating the direct impact of spline end play on engagement precision.
2Device complexity
If the strut is held in the pocket plate without radial constraint, then the structure is simpler, but the strut may be displaced from the aperture causing engagement delay
Solution Approach 1:
Instead of constraining the strut along its entire length, the invention applies a localized radial constraint only at the critical engagement region. The radial constraint portion is positioned to prevent displacement of the strut from the aperture while allowing the rest of the strut to move freely for engagement purposes, thus minimizing both complexity and engagement delay.
3Stability of the object's composition
If multiple struts are engaged simultaneously, then torque transmission is more balanced, but it is difficult to ensure symmetrical engagement of all struts
Solution Approach 1:
The struts are pre-positioned in their pockets to project outward before engagement occurs. This preliminary action ensures that when the selector plate rotates, all struts are ready to engage with their corresponding notches simultaneously, promoting symmetrical engagement and balanced torque transmission without requiring high manufacturing precision during the engagement process.
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 structure prevents engagement delays and imperfect engagement by ensuring timely and symmetrical strut engagement with notches, enhancing torque transmission reliability and reducing damage to the clutch.
Implementation Method 1
the pocket plate is allowed to be rotated by the principle of leverage utilizing a contact point between the engagement portion and the stationary member as a fulcrum
Data Source
AI summary
A fixation structure for a selectable one-way clutch that can prevent engagement delay and imperfect engagement of the selectable one way clutch is provided. The fixation structure comprises a ridge formed on a back face of the pocket plate to be splined to a casing. The ridge is situated radially inner side of a strut held in a pocket plate.