Rotation Transmission Device Anti-Rotation Control Retainer
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Solution Overview
Problem
The existing rotation transmission device is prone to rollers moving to a neutral position under disturbances, such as vibrations, which prevents torque transmission between the inner and outer rings, and the device is heavy due to the axial length of the outer ring.
Innovation Solution
Incorporating an anti-rotation mechanism between the outer ring and the control retainer, which prevents relative rotation when the electromagnetic clutch is de-energized, and using a motion converter mechanism to ensure the rollers remain engaged, along with weight-reducing features in the control retainer design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the outer ring and control retainer are designed without anti-rotation means, then the device structure is simpler and easier to manufacture, but the rollers may move to the neutral position under disturbances such as vibrations, causing loss of torque transmission capability
Solution Approach 1:
The anti-rotation means (protrusions and recesses) are pre-configured on the outer ring and control retainer to prevent relative rotation before disturbances occur. This preliminary protective measure ensures that under vibrations or external disturbances, the rollers remain engaged with the cam surfaces and cannot move to the neutral position, thus maintaining torque transmission capability.
Solution Approach 2:
The anti-rotation protrusions and recesses are designed to engage in advance during normal operation, establishing a predetermined rotational relationship between the outer ring and control retainer. This preliminary positioning action ensures that when disturbances occur, the rollers are already constrained and cannot shift to the neutral position, preventing loss of engagement.
2Stability of the object's composition
If the control retainer and rotary retainer are entirely received in the outer ring, then the device structure is more compact, but the outer ring becomes axially long and heavyweight
Solution Approach 1:
The control retainer is segmented into a flange portion and a body portion. The flange portion extends axially outward from the outer ring, allowing part of the control retainer structure to be positioned outside the outer ring boundaries. This segmentation reduces the axial length and weight of the outer ring while maintaining the functional integrity of the control retainer.
3Weight of moving object
If the flange of the control retainer is extended axially outward from the outer ring, then the weight and axial length of the outer ring are reduced, but the anti-rotation means requires additional engagement surfaces
Solution Approach 1:
The anti-rotation protrusions are integrated directly into the flange portion of the control retainer, and the corresponding recesses are formed on the outer ring surface. This merging of the anti-rotation feature with the flange structure eliminates the need for separate anti-rotation components, reducing overall complexity while achieving both weight reduction and rotational constraint functions.
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 solution enhances the reliability of torque transmission by preventing rollers from moving to a neutral position under disturbances and reduces the weight and axial length of the outer ring, improving the overall efficiency and durability of the rotation transmission device.
Implementation Method 1
an electromagnet axially facing the rotor and configured to attract the armature against the rotor, thereby axially moving the control retainer toward the rotor, upon energization of the electromagnet
Implementation Method 2
elastic members each mounted in one of the pockets and biasing the opposed pair of rollers in the one of the pockets away from each other to a stand-by position
Data Source
Figure 1
Figure 2(a)~2(b)
Figure 3~4
AI summary
A rotation transmission device includes a two-way clutch (10) which is selectively engaged and disengaged by an electromagnetic clutch (50). The two-way clutch (10) includes a retainer (16) including a control retainer member (16A) and a rotary retainer member (16B). The control retainer member (16A) and the rotary retainer member (16B) have flanges (24 and 28) and bars(25 and 29) formed on the outer peripheral portions of the respective flanges and arranged so as to circumferentially alternate with each other with pockets (31) defined between adjacent bars (25 and 29). A pair of rollers (15) are received in each pocket (31). When the control retainer member (16A) and the rotary retainer member (16B) are rotated relative to each other, the rollers (15) are adapted to be pushed by the bars (25 and 29) to the disengaged position. An anti-rotation means (60) is provided on opposed surfaces of an outer ring (11) and the control retainer member (16A). The anti-rotation means (60) is adapted to prevent the control retainer member (16A) from rotating relative to the outer ring (11) while the rollers (15) are in engagement, thereby preventing the rollers (15) from moving to the neutral position. This improves reliability of the rotation transmission device.