Hand-Power Tool High-Speed Drive and Charging Integration
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Solution Overview
Problem
Existing hand-held power tools face challenges in achieving comfortable and mechanically stable charging, efficient energy storage, and effective processing of workpieces with small configurations, particularly due to limitations in rotational speed, energy input placement, and power management.
Innovation Solution
A hand-held power tool design featuring a drive unit with a rotational speed higher than 10,000 min^-1, a gearless connection to the tool spindle, a lithium-based accumulator, and a USB interface for energy input, allowing for efficient charging and data transmission, along with a hose coupling for force transmission and protection, and a compact, lightweight design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the charging energy input is arranged on a side of the housing facing the tool clamping chuck, then charging comfort and mechanical stability are improved, but the device complexity increases
Solution Approach 1:
The charging energy input is merged with the tool clamping chuck assembly by arranging it on the same side of the housing. This integration allows the charging function to be performed in close proximity to the tool interface, improving charging comfort and mechanical stability without requiring separate charging mechanisms.
2Productivity
If the drive unit operates at high rotational speed (>10,000 min⁻¹), then productivity is improved, but the device complexity increases
Solution Approach 1:
The patent replaces traditional mechanical transmission systems with a direct-drive configuration where the drive unit connects directly to the tool spindle without intermediate mechanical components. This substitution enables high rotational speeds (>10,000 min⁻¹) to be achieved while reducing device complexity by eliminating gears, belts, or other transmission mechanisms.
3Weight of moving object
If a lithium-based accumulator is used, then weight is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent changes the energy storage parameter from traditional accumulators to lithium-based accumulators, which have superior energy density and weight characteristics. This parameter change enables significant weight reduction while the associated manufacturing precision requirements are managed through integrated mounting structures and standardized connection interfaces.
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 comfortable and mechanically stable charging, efficient processing of workpieces with high rotational speeds, and low unit costs, while maintaining a small installation space and low weight, facilitating precise and efficient operation.
Implementation Method 1
The drive unit advantageously converts the electrical energy into rotational energy. The drive unit preferably has an electric motor with maximum power between 15 watts and 150 watts
Implementation Method 2
The charging energy input preferably has an electrically conductive contact point for making contact with the hand-held power tool charger. Alternatively or additionally, the charging energy input could accommodate a coil for taking up inductively transmitted energy
Data Source
AI summary
A hand-power tool includes at least one tool spindle and a drive unit configured to drive the at least one tool spindle at a rotational speed greater than 10,000 min−1. The hand-power tool further includes at least one charging energy input and a tool chuck. The at least one charging energy input is arranged on a hand-power tool housing face that faces the tool chuck.