Eccentric Asymmetrical Coupling for Lathe Boring Tool Torque
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Solution Overview
Problem
Existing rotating cutting tools face challenges in transmitting high torques while minimizing weakening of the receiving part, leading to instability and reduced tool life.
Innovation Solution
A modular cutting tool design featuring eccentric, asymmetrical coupling elements with prismatic configurations that allow for automatic centering and robust torque transmission, reducing stress on the receiving part and enabling efficient coolant and screw placement, along with a supporting element to stabilize the tool against vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a robust driver web is used for torque transmission, then torque transmission capability is improved, but the receiving part is weakened excessively
Solution Approach 1:
The driver connection is segmented into multiple coupling pairs (at least two) arranged eccentrically around the center axis, distributing the torque transmission load across multiple locations rather than concentrating it in a single driver web, thereby reducing stress on the receiving part while maintaining torque transmission capability
Solution Approach 2:
The coupling elements are designed with asymmetrical cross-sectional areas that are oriented perpendicularly to the center axis and do not have symmetry with regard to an axis of rotation or a plane, with the cross-sectional area widening with increasing radial distance from the center axis, optimizing both torque transmission and stress distribution
2Stability of the object's composition
If the driver connection is moved to the center axis, then alignment is improved, but the receiving part is weakened excessively
Solution Approach 1:
The coupling elements are positioned eccentrically (offset from the center axis) and designed with asymmetrical cross-sections that widen radially outward, providing automatic centering functionality while distributing loads away from the center region, thus maintaining alignment without excessive weakening of the receiving part
Solution Approach 2:
The coupling elements act as intermediaries between the center axis region and the outer regions, providing both alignment functionality and load distribution, with their asymmetrical geometry enabling automatic centering while their eccentric positioning protects the center region of the receiving part
Data Source
AI summary
A boring tool has a receiving part implemented as a borer body and a front part implemented as a borer head, which extend along a central axis and can be removably fastened to one another via driver connection. The driver connection has at least two coupling pairs which are separate from one another and are disposed eccentrically relative to the central axis. Each coupling pair is formed by interlocking coupling elements, namely a receiving pocket and a driver pin. The coupling elements have an asymmetrical cross-sectional area and widen with increasing distance to the central axis. Through this design, a reliable transmission of high torques is achieved with lower strains of the borer body in the area of the driver connection. Simultaneously, an automatic centering of the two tool parts to one another is performed.