Handheld Drilling Device Direct Motor Mounting
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Solution Overview
Problem
Existing handheld drilling tools in aeronautics lack precision and performance, particularly in controlling the rotation and linear movement of cutting tools, with existing systems requiring reducers and separate control electronics, which increase encumbrance and reduce control over cutting tool rotation at low speeds.
Innovation Solution
A handheld machining device with an electric motor directly mounted on the tool holder, a ball screw system, and integrated power and control electronics, eliminating the need for reducers and separate control systems, allowing precise control of both rotation and linear movement with high-performance brushless motors and angular encoders.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a pneumatic motor with reducer is used to rotate the cutting tool at low speeds, then the rotation speed can be controlled, but the device complexity increases and control precision is reduced
Solution Approach 1:
The patent removes the reducer component from the system by using a pneumatic motor capable of direct low-speed operation. The motor is directly coupled to the cutting tool without intermediate transmission mechanisms, extracting the problematic reducer while maintaining the required low-speed rotation control through the motor's inherent characteristics
Solution Approach 2:
The patent replaces the mechanical reducer system with a pneumatic motor that inherently provides the required speed control. Instead of using mechanical gear reduction, the system uses pneumatic actuation to directly drive the cutting tool at the required low speeds, substituting a mechanical transmission system with a pneumatic drive system
2Ease of operation
If separate control electronics and flexible cables are used, then control functionality is provided, but the encumbrance increases and integration is reduced
Solution Approach 1:
The patent integrates the control electronics directly into the handheld device housing, merging previously separate control components with the main device structure. The flexible cable connecting external controls is eliminated as the electronics are now built-in, reducing encumbrance while maintaining full control functionality through integrated circuit board mounting and internal wiring
Solution Approach 2:
The integrated control electronics serve multiple functions within a single compact unit: controlling the pneumatic motor, monitoring position via encoder, managing the linear actuator, and providing user interface processing. This multi-functional integration eliminates the need for separate control boxes and flexible cables, reducing overall device encumbrance
3Manufacturing precision
If a ball screw system with separate motors is used, then linear movement control is achieved, but the device complexity and encumbrance increase
Solution Approach 1:
The patent integrates the second motor that drives the ball screw system directly into the first mounting structure, merging previously separate motor and linear actuator components into a unified assembly. The motor is positioned and coupled such that it directly drives the ball screw without requiring separate mounting structures or complex transmission linkages, reducing device complexity while maintaining precise linear movement control
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
The solution enables micron-level cutting precision and improved performance by integrating motors and encoders within the device, reducing encumbrance and enhancing control over the cutting tool, allowing for efficient and precise drilling operations.
Implementation Method 1
a linear actuator enabling the first mounting to be spaced apart from second mounting and the first mounting to be brought toward said second mounting
Implementation Method 2
the device has an angular encoder targeting the rotation of the screw of the ball screw system, as well as power and control electronics for controlling said first motor and said second motor
Data Source
AI summary
A handheld machining device (1), particularly for drilling, having a mechanism includes: a first mounting (20), on which a tool holder (2), and a motor (3, 4) arranged to rotate the tool holder (2), are mounted; a second mounting (30); and an element (40) for translatably guiding, between the first mounting (20) and the second mounting (30), a linear actuator (5) enabling the first mounting (20) to be spaced apart from the second mounting (30), and the first mounting (20) to be brought toward the second mounting (30). The motor (3, 4) is electric, and the rotor (4) of the first motor (3, 4) is directly mounted onto the tool holder (2) and is rigidly connected thereto.