Electric Shaver Dual Spring Drive Unit Vibration Isolation
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Solution Overview
Problem
Existing electric shavers face challenges in achieving efficient transmission of oscillations with large amplitudes and stable frequencies while maintaining a simple structure and easy manufacturing, often resulting in vibrations being felt during use due to mismatched dynamic effects and restricted oscillating amplitudes.
Innovation Solution
A dual spring system is introduced, where the first spring device, made of plastic, connects the drive components for resonance, and the second spring device, made of metal, links the drive unit to the appliance's structural part, providing sufficient stiffness and rigidity for efficient oscillation transmission while allowing for easy mounting and design flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a single spring device is used to connect drive components, then the structure is simple, but vibration transmission cannot be effectively reduced
Solution Approach 1:
The single spring device is segmented into two distinct spring devices: a first spring device connecting the drive components to each other, and a second spring device linking the magnetic linear drive unit to the structural part. This segmentation allows each spring device to be optimized for different functions - the first for drive component suspension and the second for vibration isolation from the housing, thereby reducing vibration transmission while maintaining reasonable structural complexity.
2Ease of manufacture
If plastic spring elements are used, then manufacturing is easier, but sufficient stiffness for efficient oscillation transmission is not achieved
Solution Approach 1:
Different material qualities are applied locally to different spring devices based on their specific functional requirements. The first spring device uses plastic material for ease of manufacture and integration, while the second spring device uses metal material to provide sufficient stiffness for efficient oscillation transmission from the drive unit to the housing. This local differentiation of material properties resolves the contradiction between manufacturing ease and stiffness requirements.
3Object-affected harmful factors
If the drive unit is rigidly connected to the housing, then structural stability is improved, but vibrations are transmitted to the housing
Solution Approach 1:
The second spring device acts as an intermediary element between the magnetic linear drive unit and the structural part of the housing. This intermediary spring device with appropriate damping characteristics isolates the drive unit from the housing, preventing vibration transmission while maintaining the necessary mounting stability. The spring device provides both mechanical support and vibration isolation, resolving the contradiction between stability and vibration transmission.
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 configuration enables stable oscillation with high amplitudes and reduced vibrations, improving the overall performance and user experience by decoupling the spring devices to prevent vibration transmission, thus enhancing the drive unit's efficiency and ergonomic design.
Implementation Method 1
a first spring device for movably connecting the first and second drive components of the drive unit to each other
Implementation Method 2
a second spring device for movably linking said magnetic linear drive unit to a structural part of the electric appliance
Implementation Method 3
drive components reciprocating or oscillating relative to each other in a substantially linear manner, wherein the driving forces may result from magnetic fields
Data Source
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AI summary
The present invention relates to electric appliances for personal care, in particular electric shavers, comprising a magnetic linear drive unit having first and second drive components supported for linear displacement relative to each other by a first spring device and adapted to magnetically interact with each other, and a second spring device for movably linking the drive unit to a structural element of the appliance. The first spring device is made from plastics such as long-chained PPS, whereas the second spring device is made from steel.