Integrated Rotor and Output Shaft Layout for Compact Work Tools
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Solution Overview
Problem
Conventional electric motors in working devices occupy more space, leading to inefficient weight distribution and discomfort during operation, particularly affecting the shift of the drive system and battery weight.
Innovation Solution
A compact design is achieved by integrating the electric motor with a rotor shaft bearing and output shaft within a flange, reducing the axial length of the motor unit and optimizing weight distribution, where the rotor shaft bearing is designed as a floating bearing with a clearance fit and O-ring for reduced friction and corrosion, and the stator is supported on the housing via a vibration-damped flange.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional electric motor with fixed-floating bearing is used, then the motor is self-supporting and easy to assemble, but the axial length increases and weight distribution becomes inefficient
Solution Approach 1:
The patent combines the motor housing and flange into a single integrated component. The flange is formed as an integral part of the motor housing, eliminating the need for separate mounting brackets or additional fastening components. This merging reduces the overall axial length while maintaining the self-supporting structure and assembly ease of conventional motors.
Solution Approach 2:
The patent repositions the bearing support function from a separate axial extension to a radial integration within the motor housing. The rotor shaft bearing is mounted directly on the motor housing in a radial direction, allowing the output shaft to extend axially without requiring additional axial length for bearing support structures.
2Stability of the object's composition
If the motor housing is made larger to accommodate conventional bearing arrangements, then the motor is self-supporting, but the device weight distribution shifts away from optimal operator comfort
Solution Approach 1:
The integration of the flange into the motor housing consolidates the support structure, concentrating the weight in the motor housing rather than distributing it to separate mounting components. This centralization of mass improves weight distribution and balances the device for better operator comfort while maintaining structural stability.
3Volume of moving object
If the axial length of the motor unit is reduced, then the housing becomes more compact, but the distance between battery and tool increases
Solution Approach 1:
The patent transitions from axial bearing support to radial bearing support, allowing the output shaft to extend axially from the motor housing without requiring additional axial space for bearing structures. This dimensional change enables compact housing while maintaining optimal battery-to-tool distance through improved spatial arrangement.
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 design results in a more compact and ergonomic device with improved weight distribution, reducing the distance between the battery and the tool, enhancing operator comfort and reducing the overall size of the housing.
Implementation Method 1
The rotor shaft bearing is preferably designed as a cantilever bearing. This results in a compact electric motor design. It is preferably provided that the rotor shaft bearing comprises a first bearing and a second bearing.
Implementation Method 2
The O-ring preferably sits in a groove formed in the rotor shaft. Once the rotor shaft is inserted into the rotor shaft bearing, the O-ring contacts the inner bearing races. Thus, the O-ring forms a frictional drive between the rotor shaft and the inner bearing races. Relative movement between the rotor shaft and the inner bearing races is prevented.
Implementation Method 3
The vibration damping elements are arranged between the motor housing and the housing. The vibration damping elements decouple the motor housing and the housing with respect to the transmission of vibrations.
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
The invention relates to a working device comprising a housing (2), an electric motor (3) arranged in the housing (2), wherein the electric motor (3) comprises a rotor shaft (4) driven to rotate about a rotor axis (5), an output shaft (10) for driving a tool, wherein the output shaft (10) is positively connected to the rotor shaft (4) at a receptacle (6) of the rotor shaft (4), and a flange (8) supported on the housing (2). The rotor shaft (4) is rotatably mounted via a rotor shaft bearing (9) arranged in the flange (8), wherein the rotor shaft bearing (9) extends in the direction of the rotor axis (5) along a bearing section (18), and wherein the output shaft (10) extends at least into the bearing section (18) of the rotor shaft bearing (9).