Electronically Commutated Motor Hand Power Tool with Coupling Element
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Solution Overview
Problem
Existing hand power tools lack a compact and efficient design that balances high power output with ergonomic handling and low maintenance, particularly in the transmission of rotary motion to a tool shaft.
Innovation Solution
The use of an electronically commutated electric motor with a robust coupling element and a bearing system that converts rotary motion into a swivel motion, combined with a rechargeable battery and ergonomic handle design, ensures high efficiency, low maintenance, and compact structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional electric motor with rotary bearings is used, then the motor can be simply constructed, but it suffers from wear and lower efficiency
Solution Approach 1:
The patent replaces the conventional mechanical brush-commutated motor system with an electronically commutated motor (ECM) that uses electronic sensors and controllers instead of mechanical contacts. This substitution eliminates wear from brushes and commutators while maintaining motor function, directly resolving the contradiction between reliability and construction complexity.
2Adaptability or versatility
If the motor shaft and output shaft are disposed at an angle, then the structural design becomes more flexible, but the transmission mechanism becomes more complex
Solution Approach 1:
The patent introduces a coupling element as an intermediary component between the motor shaft and output shaft. This coupling element facilitates the transmission of rotary motion while accommodating angular misalignment, allowing flexible shaft arrangement without requiring complex transmission mechanisms like gears or belts.
3Reliability
If a robust coupling element is used to convert rotary motion to swivel motion, then the motion transmission becomes more reliable, but the device size increases
Solution Approach 1:
The patent segments the coupling function into distinct modular components that can be integrated into the existing motor housing. By dividing the coupling mechanism into separate functional elements rather than using a single large robust component, the design achieves reliable motion transmission while minimizing the increase in overall device volume.
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 provides a powerful, efficient, and ergonomic hand power tool with a compact design, capable of high-speed oscillating motions and stable shaft mounting, enhancing user handling and tool performance.
Implementation Method 1
an electronically commutated electric motor (16), which acts upon a motor shaft (18)
Implementation Method 2
at least one coupling/connecting element (22) is provided to convert a rotary motion of the motor shaft into a swivel motion of the output shaft (20)
Implementation Method 3
at least one first bearing (32, 33) and one second bearing (34, 35) are provided to accommodate the motor shaft (18) in a rotatable manner. A third bearing (36, 37) and a fourth bearing (38, 39) are provided to accommodate the output shaft (20) in a rotatable manner
Data Source
AI summary
A hand power tool includes at least one electric-motor drive that is configured to act upon at least one motor shaft, and that is accommodated by a first housing part, the motor shaft and the first housing part defining a first common axis. The electric-motor drive is an electronically commutated electric motor. The hand power tool further includes at least one output shaft configured to drive a tool in an oscillating manner, and at least one second housing part that is configured to accommodate a rechargeable battery, the rechargeable battery and the second housing part defining a second common axis.