Floating Joint Structure for Stable Ultrasonic Joining Pressure
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Solution Overview
Problem
Conventional floating joints in ultrasonic vibration joining apparatuses experience contact instability due to fixed gaps between spherical connection regions, leading to fluctuations in pressure applied during ultrasonic vibration operations, resulting in inaccurate jointing and malfunctions.
Innovation Solution
A floating joint design that maintains a constant contact state through an appropriately set elastic force of a pressure adjusting member, eliminating the need for spherical shapes and reducing device complexity by using a one-side spherical contact relationship between a spherical portion and a flat plate-shaped bottom surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If fixed gaps are maintained between spherical connection regions to ensure flexibility, then the floating joint allows relative movement, but contact instability occurs during ultrasonic vibration operation
Solution Approach 1:
The patent employs a spherical connection region that contacts a flat surface, utilizing the curved geometry to maintain continuous contact while allowing rotational movement. The spherical shape ensures that contact is maintained across a range of motion, eliminating the bounce and contact loss issues associated with fixed gaps between spherical regions.
2Ease of operation
If spherical shapes are used for connection regions, then relative movement is enabled, but device complexity increases
Solution Approach 1:
The patent creates an asymmetric connection system where a spherical connection region on one component contacts a flat surface on the other component. This asymmetric design enables rotational freedom while simplifying the overall structure compared to bilateral spherical contacts, reducing manufacturing complexity and assembly difficulty.
3Force
If pressure is applied during ultrasonic vibration operation, then joining is achieved, but pressure fluctuations occur due to contact instability
Solution Approach 1:
The floating joint structure is designed to establish continuous contact between the spherical connection region and flat surface before ultrasonic vibration begins. This preliminary contact configuration ensures that the pressurizing mechanism maintains stable force transmission throughout the joining process, preventing pressure fluctuations that would compromise joining precision.
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 prevents contact instability, ensuring stable pressure application and accurate ultrasonic vibration operations, simplifies device configuration, and reduces device size by eliminating unnecessary components, while maintaining effective power transmission.
Implementation Method 1
maintains a constant contact state through an appropriately set elastic force of a pressure adjusting member
Implementation Method 2
an ultrasonic wave is applied while applying pressure to the electrode wire arranged on the substrate
Data Source
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AI summary
An object of the present disclosure is to provide a floating joint having a structure that does not cause a contact unstable state between first and second connections during use. And the floating joint (10) of the present disclosure includes a driving side coupling portion (20) and a driven side coupling portion (30) serving as first and second connections. A pressure adjusting structure (40) in the floating joint (10) is provided between the bottom surface exposed region (22r) of the spherical portion for contact (22) and the bottom surface facing region (42r) of a fixing ring (42) without a gap, and has elasticity. Therefore, the floating joint (10) relatively firmly maintains the one-side spherical contact relationship, in which the top region of the spherical portion for contact (22) contacts a part of the bottom surface portion (31a) of the frame body (31) by the elastic force of the pressure adjusting structure (40).