Rotary Tool Coupling with Oblique Clamping Pins
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Solution Overview
Problem
Existing rotary tool couplings face challenges in absorbing high forces due to thin edge webs and stress concentrations, which can lead to instability and reduced torque transmission.
Innovation Solution
A self-clamping, reversibly releasable coupling design featuring two opposing coupling pins with radially external and internal surfaces, forming a central receiving space for a central pin, with obliquely inclined clamping surfaces for axial pull-out protection and curved stop surfaces to reduce stress concentrations, allowing for high rigidity and torque transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a wound-around coupling pin with flutes is used, then the coupling achieves self-centering and self-clamping properties, but the edge webs become thin and are interrupted by flutes, reducing structural strength
Solution Approach 1:
The coupling pin is divided into two separate pins instead of one continuous pin with flutes. This segmentation eliminates the need for interrupting flutes in a single pin structure, maintaining edge web continuity and strength while still achieving self-centering and self-clamping through the paired pin configuration
Solution Approach 2:
The flute structure is extracted from the coupling pin design. Instead of having flutes interrupt the pin, the invention uses smooth coupling pins with obliquely inclined clamping surfaces that achieve self-clamping without requiring material removal or interruptions, thereby preserving edge web integrity
2Stability of the object's composition
If a centrally arranged coupling pin is used, then the coupling achieves self-centering, but the remaining edge webs become comparatively thin, reducing overall structural rigidity
Solution Approach 1:
The invention transitions from a single central pin arrangement to a dual pin arrangement spaced apart from each other. This dimensional change in the coupling configuration maintains self-centering capability through the paired pin geometry while preserving edge web thickness and structural rigidity by distributing the coupling function across two separate pins
3Strength
If additional fastening elements such as screws are added, then the coupling can securely absorb high forces, but the device complexity increases
Solution Approach 1:
The coupling pins are designed with obliquely inclined clamping surfaces that automatically generate self-clamping force when engaged. This self-service mechanism secures the cutting head without requiring additional fastening elements like screws, maintaining force absorption capability while minimizing device complexity
Data Source
AI summary
A coupling part structured to engage with a complementary coupling part for interchangeably fastening a cutting head to a carrier of a rotary cutting tool. The coupling part includes a pair of coupling pins arranged opposite each other with respect to a central longitudinal axis and spaced apart from each other so as to form a receiving space structured to receive a central pin of the complementary coupling part. Each coupling pin includes a stop surface for transmitting a torque, a radially external outer surface, and a radially internal inner surface. At least one of the outer surface or inner surface is a clamping surface oriented in an obliquely inclined manner with respect to the central longitudinal axis for centering and clamping the coupling part.