Rotation Transmission Device with Segmented Rubber Buffer
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Solution Overview
Problem
Existing rotation transmission devices generate a collision sound when the armature is attracted to the rotor, which is undesirable, especially in silent operation requirements like in automobiles, and the addition of a rubber member between the armature and rotor either stabilizes motion but fails to reduce sound effectively or makes the motion unstable.
Innovation Solution
A rotation transmission device with a buffer system comprising a metal annulus and a rubber annulus, where the rubber annulus has varying axial thicknesses to control the force of compression, ensuring stable attraction of the armature to the rotor while reducing collision sounds by absorbing shock.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a rubber member is added between the armature and rotor to reduce collision sound, then the collision sound is reduced, but the motion of the armature becomes unstable
Solution Approach 1:
The buffer is divided into a metal annulus and a rubber annulus, with the rubber annulus further segmented into multiple protrusions of different heights. This segmentation allows different portions of the rubber annulus to be compressed at different stages, providing both shock absorption and motion stability.
Solution Approach 2:
The rubber annulus has different axial thicknesses at different circumferential locations, with first protrusions and second protrusions of different heights. This local quality variation allows the buffer to provide different levels of cushioning force at different compression stages, resolving the contradiction between sound reduction and motion stability.
2Object-affected harmful factors
If the rubber annulus has uniform axial thickness, then the structure is simple, but the armature cannot be stably attracted to the rotor while reducing collision sound
Solution Approach 1:
The rubber annulus features first protrusions and second protrusions with different axial heights, creating local quality variations. This allows the buffer to provide progressive cushioning - the first protrusions compress initially to reduce collision sound, while the second protrusions provide additional stability as the armature approaches the rotor.
Solution Approach 2:
The rubber annulus is segmented into multiple protrusions rather than being uniform. This segmentation enables the buffer to operate in stages, with different protrusions engaging at different compression levels, achieving both sound reduction and stable attraction.
3Reliability
If a buffer with varying axial thickness is used, then stable attraction and collision sound reduction are achieved, but the manufacturing complexity increases
Solution Approach 1:
The rubber annulus is manufactured with local quality variations through protrusions of different heights. This can be achieved through molding techniques that create the varying thickness profile in a single manufacturing step, balancing the need for reliable stable attraction with manufacturing feasibility.
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
The buffer system effectively reduces collision sounds and stabilizes the attraction of the armature to the rotor, ensuring smooth operation and meeting silent operation requirements.
Implementation Method 1
a buffer provided between the armature and the rotor so as to absorb a shock generated when the armature is attracted to the rotor
Implementation Method 2
the rubber annulus is axially compressed by the metal annulus and the one of the armature and the rotor
Implementation Method 3
an electromagnet configured to attract the armature to the rotor when the electromagnet is energized
Implementation Method 4
a spring member biasing the armature away from the rotor
Data Source
AI summary
A rotation transmission device is provided in which a collision sound by an armature and a rotor is less likely to occur, and further the armature is stably attracted to the rotor. A buffer is provided between the armature and the rotor. The buffer is constituted by a metal annulus axially movably supported by the armature, and a rubber annulus configured such that as the armature approaches the rotor, the rubber annulus is axially compressed by the metal annulus and the armature. The rubber annulus has different axial thicknesses at different circumferential locations thereof such that when the degree of axial compression of the rubber annulus is large, the rubber annulus is axially compressed in its longer circumferential area than when the degree of axial compression of the rubber annulus is small.