Rotary Tool Coupling with Segmented Clamping and Torque Sections
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Solution Overview
Problem
Existing rotary tool coupling connections are complex and expensive to manufacture due to the need for precise oblique surfaces for clamping and torque transmission, which complicates the production process.
Innovation Solution
A rotary tool design featuring coupling elements with parallel clamping and torque sections, and a stop element with radial surfaces that form an axial positive fit, allowing for simple manufacturing and secure attachment without additional fasteners, using diagonally opposite fastening flanges and a stop element with a circular cross-section for axial pullout safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If oblique surfaces are used for clamping and torque transmission, then effective positive-fit connection and axial tightening are achieved, but manufacturing complexity and cost increase
Solution Approach 1:
The coupling connection is divided into separate functional sections: clamping sections for radial clamping force transmission, torque sections for torque transmission, and stop sections for axial positioning. This segmentation allows each section to be optimized independently, with stop sections using simple parallel surfaces instead of complex oblique surfaces, thereby reducing manufacturing complexity while maintaining axial pullout safety
Solution Approach 2:
The axial tightening function is extracted from the clamping and torque sections and assigned to dedicated stop sections. This extraction allows the clamping and torque sections to use simple parallel surfaces, eliminating the need for complex oblique surfaces in these sections while axial pullout safety is maintained by the stop sections
2Reliability
If dovetail joints are used for axial tightening, then effective positive-fit connection is achieved, but device complexity increases
Solution Approach 1:
The coupling connection is segmented into distinct clamping sections, torque sections, and stop sections. The stop sections provide axial positioning and tightening through simple parallel surfaces, eliminating the need for complex dovetail joints while maintaining axial pullout safety. Each section has a dedicated function, reducing overall device complexity
Solution Approach 2:
The axial tightening function is extracted from the clamping and torque sections and assigned to dedicated stop sections. This allows the clamping and torque sections to use simple parallel surfaces instead of complex dovetail joints, reducing device complexity while axial pullout safety is maintained by the stop sections
3Force
If precise oblique surfaces are used for clamping sections, then effective clamping force transmission is achieved, but manufacturing precision requirements increase
Solution Approach 1:
The coupling connection is segmented into clamping sections with parallel surfaces for radial clamping force transmission, torque sections for torque transmission, and stop sections for axial positioning. The parallel surfaces in clamping sections are easier to manufacture with high precision than oblique surfaces, reducing manufacturing precision requirements while maintaining effective clamping force transmission
Solution Approach 2:
The surface geometry parameter is changed from oblique to parallel for the clamping sections. This parameter change simplifies manufacturing while maintaining the ability to transmit clamping forces effectively, as the parallel surfaces provide sufficient contact area and force transmission capability
4Reliability
If additional fastening means are used, then secure attachment is achieved, but device complexity increases
Solution Approach 1:
Multiple functions (clamping, torque transmission, and axial positioning) are merged into a single coupling connection between the coupling pin and pin receptacle. The stop sections provide axial positioning and tightening, eliminating the need for additional fastening means such as screws, thereby reducing device complexity while maintaining attachment security
Solution Approach 2:
The coupling connection is designed with multi-functionality: clamping sections transmit radial clamping forces, torque sections transmit torque, and stop sections provide axial positioning and tightening. This multi-functionality eliminates the need for additional specialized fastening means, reducing device complexity while ensuring secure attachment
Data Source
AI summary
The rotary tool comprises a support and a cutting head which can be inserted into a pin receptacle of the support via a coupling pin. The support and the cutting head have mutually corresponding surface sections for transferring a radial clamping force and have mutually corresponding torque sections for transferring torque. For an axial pull-out stop device, effective stop surfaces are formed on the pin receptacle and on the coupling pin in the axial direction, wherein, to do this, a stop element is formed, the radial extension of which is smaller than or equal to a radial extension (r2) of the surface sections of the coupling pin and wherein the stop surfaces and the surface section are offset relative to each other in the circumferential direction.