Dual-Eccentric Orbital Drilling Without Belt Offset Errors
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Solution Overview
Problem
Existing orbital drilling devices face issues with imprecise radial offset adjustment, require manual operation, and are not autonomous, leading to increased completion time and inaccuracies due to belt distension and the need for machine tool integration.
Innovation Solution
An orbital drilling device with a motor-driven system that includes two eccentrics and a control mechanism for continuous adjustment of the angular offset between them, allowing precise control of the cutting tool's trajectory without the need for external machine tools, using a direct drive mechanism and toothed rings to ensure accurate and efficient drilling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If manual adjustment of radial offset is used, then device complexity is reduced, but manufacturing precision deteriorates
Solution Approach 1:
The patent replaces manual mechanical adjustment with an automated motor-driven system. A first motor rotates the first eccentric body, and a second motor rotates the second eccentric body, enabling precise control of the cutting tool's orbital trajectory without manual intervention. This substitution of manual operation with automated mechanical systems resolves the contradiction by achieving high precision while maintaining reasonable device complexity.
2Device complexity
If belt drive mechanism is used for eccentric rotation, then device complexity is reduced, but reliability deteriorates due to belt distension
Solution Approach 1:
The patent replaces the belt drive mechanism with a direct motor-driven system. The first motor directly rotates the first eccentric body, and the second motor directly rotates the second eccentric body, eliminating the belt transmission chain. This direct drive approach removes the source of distortion and slippage associated with belts, thereby improving reliability and maintaining consistent offset adjustment accuracy throughout operation.
3Manufacturing precision
If machine tool integration is required, then manufacturing precision is improved, but productivity deteriorates due to increased setup time
Solution Approach 1:
The patent designs the orbital drilling device as a self-contained, autonomous unit that integrates all necessary functions (motor drives, eccentric mechanisms, cutting tool mounting) into a single portable device. This eliminates the need for integration with external machine tools, allowing the device to be quickly positioned and operated on various workpieces without lengthy setup procedures, thereby improving productivity while maintaining drilling precision.
4Productivity
If autonomous operation is implemented, then productivity is improved, but device complexity increases
Solution Approach 1:
The patent implements autonomous operation through a self-contained control system where two motors automatically control the rotation of the two eccentric bodies. The system requires no external machine tool integration or complex external control mechanisms - the device manages its own operation through integrated motor controls that regulate the orbital motion of the cutting tool, achieving productivity gains without excessive 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
Enables precise and rapid production of diverse drilling shapes and dimensions with reduced device size and elimination of belt-related inaccuracies, allowing for autonomous operation and improved manufacturing quality.
Implementation Method 1
a first eccentric 13, internal, comprising a hollow cylindrical body receiving said motor 11... a second eccentric 14, external, comprising a hollow cylindrical body receiving the first eccentric 13... the first eccentric 13 being configured to be mounted movable relative to the motor 11... the second eccentric 14 being mounted movable for rotation relative to the second eccentric 14
Data Source
Figure 1
Figure 2a~2c
Figure 3
AI summary
Orbital drilling device (1) comprising, on one frame (10): - a motor (11) which rotates, on itself, a cutting tool (12), - a first inner eccentric (13) which receives said motor (11) and is rotatably mounted, - a second outer eccentric (14) which receives the first eccentric (13) and is rotatably mounted, - a reference body (15) which is rigidly connected to the frame (10) and receives the second eccentric (14), which is rotatably mounted, - a first means (130) for driving the first eccentric (13), - a second means (140) for driving the second eccentric (14) at the same time as the first eccentric (13) is rotated, - control means configured to reproduce any trajectory (T) of the cutting tool (12) in said area (Z12) by continuously monitoring the angular offset (ϴ14- ϴ13) between the first eccentric (13) and the second eccentric (14).