Handheld Tool Motor Fixation Using Casting Compound
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Solution Overview
Problem
Existing hand tools face issues with motor fixation, leading to potential mechanical damage and moisture penetration, which compromises their durability and sealing.
Innovation Solution
The motor is arranged in the handle with a play, and the resulting free space is filled with a casting compound, providing shock absorption and sealing, while the entire drive device can be encased for enhanced protection and manufacturing simplicity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the motor is securely fitted into the receptacle, then the motor fixation is strong, but the motor is vulnerable to mechanical damage and moisture penetration
Solution Approach 1:
The patent applies beforehand cushioning by filling the clearance between the motor and receptacle with casting compound before final assembly. This casting compound acts as a cushioning material that absorbs mechanical shocks and prevents moisture penetration, protecting the motor from damage while maintaining secure fixation.
Solution Approach 2:
The patent uses composite materials by combining the motor with casting compound in the receptacle. The casting compound creates a composite structure that integrates the motor into the handle assembly, providing both mechanical strength and environmental protection through the combined properties of the motor and casting material.
2Reliability
If the motor is arranged with clearance in the receptacle, then the motor is protected from mechanical damage, but the motor fixation strength is reduced
Solution Approach 1:
The patent uses casting compound as an intermediary material that fills the clearance between the motor and receptacle. This intermediary material maintains the protective clearance while simultaneously providing fixation strength, resolving the contradiction between protection and secure mounting.
3Reliability
If control electronics are encased in casting compound, then the drive unit is better protected, but the manufacturing process becomes more complex
Solution Approach 1:
The patent merges the protection of multiple components (motor and control electronics) into a single casting operation. By encasing both elements in the same casting compound within the receptacle, the manufacturing process is simplified compared to separately protecting each component, while achieving comprehensive protection for the entire drive unit.
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 solution enhances the hand tool's robustness against mechanical loads, improves sealing, and protects the motor and electronics from environmental damage, making it more durable and reliable.
Implementation Method 1
a free space defined by a clearance between the motor (8) and the receptacle (12) is filled with a casting compound (16)... This allows the invention to achieve shock absorption of the motor against mechanical loads
Implementation Method 2
This allows the invention to achieve shock absorption of the motor against mechanical loads and/or sealing of the motor... allowing moisture to penetrate. This can be prevented by the invention
Data Source
Figure 1
Figure 2
AI summary
It is proposed that in a motor-driven hand tool (1) the motor (8) be arranged in a receptacle (12) of the handle (2) of the hand tool (1) with a clearance, wherein a free space (14) defined by the clearance between the motor (8) and the receptacle (12) is filled with a casting compound (16) (see Fig. 1).