Wave Generator Groove Structure for Uniform Adhesive Bonding
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Solution Overview
Problem
In strain wave gearing, the adhesive effect between the wave bearing and wave plug is reduced and becomes uneven due to adhesive being scraped out during press-fitting, leading to decreased joining force and uneven pulling-out force.
Innovation Solution
Forming adhesive-retaining grooves on the surfaces of the wave plug and wave bearing to retain adhesive, which are microgrooves of no greater than micrometer-order width and depth, arranged in specific patterns to minimize adhesive loss and ensure even distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If adhesive is applied to the inner-race inner peripheral surface before press-fitting, then the joining force between wave bearing and wave plug is improved, but the adhesive is scraped out during press-fitting causing uneven adhesive effect
Solution Approach 1:
The inner-race inner peripheral surface is segmented into multiple grooves that divide the adhesive application areas. This segmentation prevents adhesive from being scraped out continuously during press-fitting, allowing adhesive to remain in designated retention zones and achieve uniform distribution across the bonding interface.
Solution Approach 2:
The grooves act as intermediary structures that hold and control the adhesive during the press-fitting process. By providing these intermediate adhesive retention zones, the grooves mediate between the adhesive application and the final bonding, ensuring consistent adhesive effect throughout the joint.
2Force
If press-fitting is performed to secure the wave plug, then the mechanical joining force is improved, but excessive adhesive is scraped out reducing the adhesive effect
Solution Approach 1:
The grooves segment the adhesive layer into discrete retention zones, preventing continuous adhesive loss during press-fitting. The adhesive is confined within groove boundaries, ensuring that mechanical pressing force does not scrape out excessive adhesive while still achieving strong mechanical joining.
Solution Approach 2:
The groove structures create a porous-like retention network that holds adhesive in place during press-fitting. This network structure allows the adhesive to be retained where needed while accommodating the mechanical pressing action, reducing overall adhesive loss.
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 solution increases the joining force and stability of the wave plug and wave bearing, reducing unevenness in the pulling-out force and enhancing the adhesive effect between the components.
Implementation Method 1
adhesive-retaining grooves capable of retaining an adhesive are formed
Implementation Method 2
The wave bearing is forcibly caused to flex into an ellipsoidal shape by the press-fitting of the wave plug
Implementation Method 3
the adhesive effect between the wave bearing and the wave plug is increased
Data Source
AI summary
In a wave generator for a strain wave gearing, a plug outer peripheral surface of a rigid wave plug has a non-circular profile and is fixed to an inner-race inner peripheral surface of a wave bearing by press-fitting and using an adhesive. The plug outer peripheral surface is a groove formation surface in which microgrooves are formed as adhesive-retaining grooves that can retain the adhesive. When the wave plug is press-fitted into the wave bearing, the amount of adhesive that is scraped out from therebetween is reduced and the bonding strength therebetween can be increased while also preventing unevenness of the bonding strength.