Motor Flange and Output Shaft Layout for Compact Work Tools
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Solution Overview
Problem
Conventional work apparatuses with electric motors have a large constructional footprint, leading to inefficient weight distribution and reduced ergonomics due to the increased space taken by the motor within the housing.
Innovation Solution
A compact work apparatus design where the electric motor's rotor shaft is mounted rotatably via a rotor shaft bearing in the flange, allowing the output shaft to extend into the bearing section, thereby reducing the axial length of the flange/electric motor unit and optimizing space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional electric motors with fixed/loose bearing in motor housing are used, then the electric motor is self-contained and can be simply mounted as a unit, but the electric motor takes up increased construction space in the housing
Solution Approach 1:
The electric motor is divided into separate functional components: the stator remains in the motor housing while the rotor shaft with bearing is separated and mounted in the flange. This segmentation allows the bearing to be positioned optimally in the flange rather than being constrained within the motor housing, reducing the overall construction space required.
Solution Approach 2:
The bearing arrangement is moved from the traditional in-line position within the motor housing to a perpendicular arrangement in the flange. The rotor shaft bearing is arranged in the flange at right angles to the rotor axis, allowing the output shaft to extend axially from the flange. This dimensional repositioning reduces the axial length of the motor unit.
2Volume of stationary object
If conventional electric motors with increased construction space are used, then the motor housing can accommodate all components, but the weight distribution of the entire drive system becomes inefficient
Solution Approach 1:
The bearing and rotor shaft assembly are extracted from the motor housing and mounted separately in the flange. This extraction allows the heavy motor housing to be positioned optimally in the upper region of the device, while the counterbalancing battery pack can be positioned in the lower region, achieving efficient weight distribution and improved ergonomics.
3Length of stationary object
If the output shaft does not extend into the bearing section, then the flange length is maximized, but the overlap length between output shaft and rotor shaft is insufficient
Solution Approach 1:
The bearing is arranged in the flange at right angles to the rotor axis, creating a perpendicular relationship between the bearing arrangement and the rotor shaft. This orthogonal configuration allows the output shaft to extend axially from the flange and overlap with the rotor shaft in the axial direction, achieving sufficient overlap length while keeping the flange compact.
Data Source
AI summary
A work apparatus includes a housing, an electric motor arranged in the housing, the electric motor including a rotor shaft driven rotationally about a rotor axis, an output shaft for driving a tool, the output shaft being connected with a form fit to the rotor shaft on a receptacle of the rotor shaft, and a flange supported on the housing. The rotor shaft is mounted rotatably via a rotor shaft bearing arranged in the flange, the rotor shaft bearing extending along a bearing section in the direction of the rotor axis, and wherein the output shaft extends at least as far as the bearing section of the rotor shaft bearing.