Selectable One-Way Clutch Axial Actuator Design
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Solution Overview
Problem
Existing selectable one-way clutches require large actuators due to their radial dimensions, leading to increased size and complexity, particularly in applications like power transmission units in automobiles.
Innovation Solution
A selectable one-way clutch design where the actuator is offset along the rotational center axis, allowing it to operate along a tangential line of the selector member's circumference, reducing the required stroke and outer dimensions by positioning the actuator radially inward, and incorporating a connecting arm with a tab and arm configuration to minimize interference and friction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the actuator is disposed on the radially outer side of the slide member to avoid interference, then the actuator can operate without collision, but the radial dimension between the rotational center and the protrusion must be enlarged, requiring a longer actuator stroke
Solution Approach 1:
The actuator is repositioned from a radial arrangement to an axial arrangement, utilizing the axial dimension of the selector member rather than the radial dimension. This dimensional transition allows the actuator to be disposed on the axial side instead of the radial outer side, reducing the required stroke length while maintaining interference avoidance.
Solution Approach 2:
Instead of placing the actuator on the radially outer side as in conventional designs, the invention inverts this arrangement by positioning the actuator on the axial side of the selector member. This inversion fundamentally changes the spatial relationship between the actuator and the rotating components, enabling compact design with reduced stroke.
2Ease of operation
If a large stroke actuator is used to rotate the slide member between engagement and disengagement positions, then the rotational angle requirement is met, but the actuator size and overall clutch dimensions increase
Solution Approach 1:
The actuator operates in the axial dimension rather than the radial dimension, allowing it to achieve the necessary rotational angle of the selector member with a significantly reduced stroke. This dimensional change enables compact actuator sizing while maintaining full operational capability.
3Volume of moving object
If the actuator is positioned radially inward to reduce dimensions, then the overall clutch size is reduced, but the actuator may interfere with the selector member during rotation
Solution Approach 1:
By positioning the actuator on the axial side of the selector member rather than in the radial direction, the invention eliminates potential interference zones while maintaining compact overall dimensions. The axial positioning allows the actuator to operate in a dimension where it does not conflict with the rotational path of the selector member.
Data Source
AI summary
A selectable one-way clutch is provided. The selectable one-way clutch comprises a selector member rotated at a predetermined angle between an engagement position and a disengagement position, and an actuator that reciprocates linearly along a tangential line of the selector member to rotate the selector member to the engagement position and to the disengagement position. The actuator comprises an actuation member that is offset from the selector member in a direction along a rotational center axis of the selector member to actuate along the tangential line of the circumference of the selector member. The selectable one-way clutch further comprises an arm connecting the actuation member and the selector member to rotate the selector member by a linear motion of the actuation member.