Magnetic Core Drill Spindle Layout for Low-Height Access
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Solution Overview
Problem
Magnetic core drilling machines are typically large and cumbersome, making them difficult to use in confined spaces such as I-beams, as they require a significant height and length to operate effectively.
Innovation Solution
The spindle axis is aligned parallel to the rotor shaft axis, allowing for axial adjustment of the tool spindle relative to the drive motor and magnetic base, enabling a compact design by eliminating the need for bevel gearing and utilizing an electrically commutated drive motor, along with a three-stage gear transmission and safety clutch, to achieve a slim and lightweight drill.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the tool spindle is arranged at a right angle to the rotor shaft axis with bevel gearing, then power transmission is achieved, but the drill height becomes too large for use in confined spaces
Solution Approach 1:
Instead of arranging the tool spindle perpendicular to the rotor shaft axis (conventional design), the patent inverts the arrangement by aligning the tool spindle axis parallel to the rotor shaft axis. This fundamental reconfiguration eliminates the need for bevel gearing and dramatically reduces the drill height, enabling use in confined spaces while maintaining effective power transmission through alternative gearing arrangements.
Solution Approach 2:
The patent transitions from a perpendicular spatial arrangement (one dimension) to a parallel arrangement (another dimension). By changing the dimensional relationship between the rotor shaft axis and tool spindle axis from orthogonal to collinear, the design achieves compact height while preserving the power transmission function through repositioned gear stages.
2Length of stationary object
If a compact design with parallel axes is used, then drill height is reduced, but power transmission complexity increases
Solution Approach 1:
The power transmission system is divided into three distinct gear stages arranged in sequence along the parallel axes. Each stage handles a portion of the power transmission task, with gears positioned at different locations along the rotor shaft and tool spindle. This segmentation allows the complex power transmission requirement to be met through multiple simpler, modular gear engagements rather than a single complex mechanism.
3Power
If universal motor is used, then sufficient power is achieved, but motor length increases the overall drill size
Solution Approach 1:
The patent changes the fundamental parameter of motor type from universal motor to electrically commutated motor (EC motor). This parameter change enables achieving the required power output with a significantly shorter motor length, as EC motors have a more compact structure. The parallel axis arrangement and three-stage gearing compensate for any torque characteristics, maintaining effective power transmission to the tool spindle.
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
This configuration results in a very compact drill that can be used in tight spaces, with a reduced weight and maintenance effort, while ensuring efficient power transmission and preventing overloading, allowing for precise drilling in limited conditions.
Implementation Method 1
a magnetic base (3) for detachably fastening the drill (1) to a workpiece surface
Data Source
Figure 1
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Figure 3
AI summary
A drilling machine, in particular a magnetic core drilling machine, has a magnetic base (3) for detachably attaching the drilling machine to a surface, a drive motor (5) housed in a casing (4) which has a rotor shaft (16) with a rotor shaft longitudinal axis (17) which is connected via a gearbox (7) to a tool spindle (8) having a spindle longitudinal axis (14) and a tool holder (12) connected to the tool spindle (8) for receiving a drilling tool, wherein the spindle longitudinal axis (14) is oriented substantially parallel to the rotor shaft longitudinal axis (17) and the tool spindle (8) is axially adjustable along the spindle longitudinal axis (14) relative to the drive motor (5) and the magnetic base (3).