Concentric Pressing for Drive Unit Modular Units
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Solution Overview
Problem
Conventional adhesive and shrink fitting processes for securing components in electric motors are inefficient, leading to high processing costs, safety concerns, and flexibility issues, as they require toxic substances, high temperatures, and can result in incomplete bonding or deformation errors.
Innovation Solution
A concentric pressing process secures modular units within a drive unit device by deforming a basic modular unit using a hydraulic press, eliminating the need for adhesives and shrink fitting, allowing for precise deformation and increased safety, flexibility, and processing speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If adhesive process is used to secure stator in housing, then bonding is achieved, but processing costs increase and safety concerns arise due to toxic substances
Solution Approach 1:
The patent extracts and eliminates the adhesive substance from the bonding process. Instead of using chemical adhesives that require curing agents and produce toxic emissions, the invention employs a purely mechanical pressing process where the housing is pressed onto the stator with controlled force to create a secure mechanical bond without any chemical substances.
Solution Approach 2:
The patent replaces the chemical bonding mechanism (adhesive process) with a mechanical bonding mechanism (pressing process). The chemical system involving adhesives and curing agents is substituted with a mechanical system using controlled pressing force applied through a pressing device, eliminating the need for harmful chemical substances while maintaining bonding reliability.
2Reliability
If shrink fitting process is used to secure stator in housing, then mechanical bonding is achieved, but high temperatures cause color changes and reduce flexibility
Solution Approach 1:
The patent extracts and eliminates the thermal energy input from the bonding process. Instead of heating the housing to high temperatures to achieve expansion and subsequent shrink fitting, the invention uses ambient temperature pressing with controlled mechanical force, removing the harmful thermal effect that causes color changes and material property alterations.
Solution Approach 2:
The patent replaces the thermal bonding mechanism (shrink fitting using heat expansion) with a mechanical bonding mechanism (cold pressing). The thermal system involving heating and phase expansion is substituted with a mechanical system using direct pressing force, avoiding high temperatures entirely while achieving secure mechanical bonding.
3Reliability
If adhesive or shrink fitting process is used, then components are secured, but processing time increases due to curing or cooling requirements
Solution Approach 1:
The patent extracts and eliminates the time-consuming curing and cooling phases from the bonding process. By removing the chemical adhesive step (which requires curing time) and the thermal shrink fitting step (which requires cooling time), the invention achieves bonding through immediate mechanical pressing that completes without waiting for chemical or thermal processes.
Solution Approach 2:
The patent enables continuous production by eliminating the waiting periods inherent in adhesive curing and shrink fitting cooling. The pressing operation can be performed continuously without interruption for chemical reactions or thermal equilibration, maintaining constant productive action throughout the bonding process.
4Reliability
If conventional adhesive and shrink fitting methods are used, then components are bonded, but processing costs and device complexity increase
Solution Approach 1:
The patent extracts and eliminates the complex auxiliary systems required for adhesive and shrink fitting processes. This includes removing adhesive application systems, curing agent delivery systems, heating elements, temperature control systems, and cooling mechanisms, retaining only the essential pressing function.
Solution Approach 2:
The pressing device is designed to perform multiple functions: applying bonding force, controlling pressure distribution, and ensuring proper alignment. This multi-functional approach replaces the multiple specialized systems (adhesive applicators, heating devices, cooling systems) with a single versatile pressing mechanism, reducing overall device complexity.
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 method reduces processing costs, enhances safety by avoiding toxic substances and high temperatures, and increases flexibility and accuracy in securing components, while allowing for faster production and easier verification of secure connections.
Implementation Method 1
A concentric pressing process secures modular units within a drive unit device by deforming a basic modular unit using a hydraulic press
Data Source
AI summary
The invention relates to a method for producing a drive unit device, in particular a fan device, which has at least one first modular unit (12) and at least one second modular unit (16), which concentrically accommodates at least a portion of the first modular unit (12), with the first and second modular units (12, 16) being intended to contribute mechanically to a change in torque, and the first modular unit (12) being secured in the second modular unit (16) in at least one method step (100, 110). To increase safety and reduce process costs, it is proposed that the first modular unit (12) be secured in the second modular unit (16) by means of at least one concentric pressing process step.