Core Drill Transmission and Handle Layout for Quiet Torque Control
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Solution Overview
Problem
Conventional core drills lack ergonomic design and efficient torque transmission, leading to suboptimal user handling and noise during operation.
Innovation Solution
A power tool with a clamshell housing, a brushless direct current motor, and a multi-speed transmission system that includes a helical gear and pinion arrangement for torque and speed adjustment, along with an auxiliary handle attachment system for improved user control and reduced noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional core drills are used, then basic drilling function is achieved, but ergonomic design is lacking and user handling is suboptimal
Solution Approach 1:
The housing is divided into a motor housing portion and a drive housing portion, creating modular sections that can be independently optimized. The auxiliary handle is separable and can be attached to different mounting points, allowing users to segment the tool configuration based on specific application needs, thereby improving ergonomics without overwhelming complexity.
Solution Approach 2:
The auxiliary handle can be mounted at multiple positions along the rotational axis (first mounting point on drive housing, second mounting point on mounting portion between motor and drive housing). This adds a dimensional aspect to handle positioning, allowing users to optimize grip and control based on their specific needs, improving ease of operation.
2Object-affected harmful factors
If conventional core drills are used, then drilling operation is performed, but noise levels are high during operation
Solution Approach 1:
The transmission system provides multiple speed settings that allow the operator to dynamically adjust the drilling speed based on material hardness and drill bit conditions. By optimizing the rotational speed to match the specific drilling task, the system reduces unnecessary noise generation while maintaining effective drilling performance, addressing the noise issue without requiring a completely redesigned tool.
3Power
If conventional core drills are used, then basic torque transmission is provided, but efficient torque transmission and speed adjustment are lacking
Solution Approach 1:
The transmission system acts as an intermediary between the motor and the drill bit, providing gear mechanisms that can translate motor output into optimized torque and speed combinations. This intermediary system allows efficient torque transmission to the drill bit while enabling speed adjustment, resolving the contradiction between power delivery and operational flexibility.
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 design enhances user ergonomics, reduces noise levels, and provides efficient torque transmission, resulting in improved handling and quieter operation.
Implementation Method 1
a brushless direct current motor
Implementation Method 2
a helical gear and pinion arrangement for torque and speed adjustment
Data Source
Figure 1
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AI summary
A core drill includes a housing, a first handle extending from the housing and defining a gap between the handle and the housing, a motor supported within the housing, and a battery removably coupled to the housing and configured to provide power to the motor. The battery has an output voltage greater than 40 volts. The core drill further includes a spindle configured to rotate about a rotational axis in response to torque received from the motor and a fluid delivery system configured to supply fluid to the spindle. The fluid delivery system includes a valve operable to regulate a flow of fluid to the spindle and an auxiliary handle removably coupleable to the housing at each of a first mounting point and a second mounting point.