Segmented Coupling Pin for Rotary Tool Torque and Retention
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Solution Overview
Problem
Conventional modular rotary tools face limitations in the reliability of their torque drive, clamping, and axial pullout safety mechanisms, particularly when drilling on uneven or angled surfaces, due to stress concentration and potential deformation of the retaining and drive structures.
Innovation Solution
A modular rotary tool design featuring a cutting head and support with distinct functional surfaces for torque transmission, clamping, and axial pullout safety, where the coupling pin and receptacle have separate functional levels with optimized surfaces for each function, including a circumferential groove for axial pullout safety and radial clamping, ensuring reliable operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the retaining and drive structure of the shank is used to retain and rotate the cutting head, then the cutting head can be securely held and driven, but the structure is subject to deformation and failure due to stress concentration during drilling on uneven or angled surfaces
Solution Approach 1:
The coupling pin is divided into two distinct parts: a drive portion with torque transmission surfaces for rotational drive, and a retaining portion with clamping surfaces and stop surfaces for axial retention. This segmentation separates the torque transmission function from the retaining function, preventing stress concentration in a single structure and improving overall reliability.
2Power
If the torque surfaces extend outward radially to the outermost periphery of the cutting head, then torque transmission is maximized, but the clamping connection and axial pullout safety are compromised
Solution Approach 1:
The coupling pin is segmented into a drive portion that extends to the outermost periphery for maximum torque transmission, and a retaining portion that is radially offset inward to provide proper clamping connection and axial pullout safety. This spatial segmentation allows both functions to be optimized simultaneously without interference.
Solution Approach 2:
The retaining portion is positioned in a different radial dimension than the drive portion. The drive portion utilizes the full radial extent to the outermost periphery for torque, while the retaining portion is offset radially inward to engage with the pin receptacle, creating a multi-dimensional arrangement that satisfies both torque transmission and retention requirements.
3Device complexity
If the coupling pin and receptacle use a simple clamping connection without separate functional levels, then the device complexity is reduced, but the torque drive and axial pullout safety functions are unreliable
Solution Approach 1:
The coupling structure is segmented into distinct functional levels: the drive portion with torque transmission surfaces for rotational drive, and the retaining portion with clamping surfaces and stop surfaces for axial retention. This segmentation creates separate functional zones that reliably perform their respective functions while maintaining a relatively simple overall structure.
Solution Approach 2:
Different portions of the coupling pin have different functional qualities: the drive portion is optimized for torque transmission with surfaces extending to the outermost periphery, while the retaining portion is optimized for clamping and axial retention with offset radial positioning and stop surfaces. This local differentiation of quality ensures reliable performance of each function without requiring complex overall structure.
Data Source
AI summary
A cutting head is formed for insertion into a support in a modular rotary tool, in particular a drill. The coupling head has a coupling having torque surfaces and clamping surfaces on its outer periphery. The coupling pin is divided into a front pin part and a rear pin part. The front pin part is defined by a circumferential groove. Stop surfaces for an axial pullout safety are formed in the transition area between the two the front pin part and the rear pin part. The torque surfaces and the clamping surfaces are arranged in different pin parts. For example, the clamping surfaces are preferably formed on the front pin part and the torque surfaces are preferably formed in the rear pin part.