Composite Drive Pad Bonding for Reliable Electromechanical Actuators
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Solution Overview
Problem
Existing electromechanical actuators face challenges in achieving a reliable and reproducible attachment of drive pads to their base surfaces due to uncertainties in glue layer thickness, variations in glue material properties, and adverse effects from high temperatures, which can lead to micro-cracks and changes in elastic properties.
Innovation Solution
A composite drive pad comprising a metal portion directly joined to a ceramic portion, irreversibly attached to a metal plate using a metal-based bond, providing a stable and controlled joint between the drive pad and the excitation body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If glue is used to attach the drive pad to the electromechanical drive element, then the attachment process is simple, but the reliability and reproducibility of the attachment is poor due to uncertain glue layer thickness and material property variations
Solution Approach 1:
The patent changes the attachment method from chemical bonding (glue) to mechanical bonding (metal-based bond), fundamentally altering the bonding mechanism parameters. This transition eliminates the variability associated with glue layer thickness and material properties, achieving reproducible and reliable attachments while maintaining manufacturing simplicity through standardized metal bonding processes
Solution Approach 2:
The invention introduces a composite structure with a metal portion integrated into the drive pad, combining the advantages of ceramic (wear resistance) and metal (bondability). This composite design enables reliable metal-based bonding to the metal plate while preserving the ceramic portion's contact surface properties, resolving the contradiction between ease of manufacture and attachment reliability
2Ease of manufacture
If glue is used to attach the drive pad, then the manufacturing process is straightforward, but the temperature resistance is poor as glue softens at high temperatures causing changes in elastic properties
Solution Approach 1:
The patent changes the bonding material's thermal properties by replacing organic glue with inorganic metal-based bond. This parameter change in material composition eliminates the temperature sensitivity issue, as metal bonds maintain their mechanical properties at high temperatures, while the manufacturing process remains straightforward through established metal bonding techniques
Solution Approach 2:
The composite drive pad structure separates the thermal bonding function (handled by the metal portion and metal-based bond) from the wear resistance function (handled by the ceramic portion). This allows the bonding interface to be optimized for temperature resistance without compromising the contact surface's friction and wear properties
3Ease of manufacture
If glue is used for attachment, then the initial manufacturing is simple, but micro-cracks form at the edges under high thermal or mechanical stresses
Solution Approach 1:
The patent changes the bonding mechanism from adhesive bonding to metallurgical or mechanical bonding, fundamentally altering how stresses are distributed at the attachment interface. The metal-based bond creates a rigid, crack-resistant connection that prevents edge micro-crack formation under thermal and mechanical stresses, while maintaining manufacturing simplicity through standardized bonding processes
Solution Approach 2:
The integrated metal portion acts as a stress-distributing element that reinforces the drive pad structure. This composite design prevents stress concentration at the attachment edges, eliminating the root cause of micro-crack formation while the metal-based bond provides superior strength and crack resistance compared to glue
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 enables a cost-efficient and reliable attachment, enhancing the mechanical stability and temperature resistance of electromechanical drive elements, while allowing for optimized ceramic and metal properties tailored to specific application requirements.
Implementation Method 1
The electromechanical material in the electromechanical drive element is excited by an electrical signal, which exciting results in a shape change of the electromechanical drive element
Data Source
AI summary
A manufacturing method for an electromechanical drive element comprises providing (S10) of an excitation body comprising at least one volume of electromechanical material. The excitation body has a metal plate integrated as a surface of the excitation body. The excitation body being arranged to cause shape changes of the electromechanical material and the metal plate when the volume(s) of electromechanical material being excited by a voltage signal. A composite drive pad is provided (S20). The composite drive pad comprises a metal portion directly joined to a ceramic portion. After the providing of a composite drive pad, the metal portion of the composite drive pad is irreversibly attached (S30) to the metal plate of the excitation body by use of a metal-based bond. An electromechanical drive element and an electromechanical motor using such an electromechanical drive element are also disclosed.