Resilient Motor Mount Bumper for Power Toothbrush Vibration Isolation
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Solution Overview
Problem
Existing power toothbrush designs face issues with vibration and shock isolation, cogging, and high costs due to complex multi-part frames, which affect durability and user experience.
Innovation Solution
A resilient motor mount with a bottom bumper and mount arms that absorb vibrations and axial shocks, combined with a multi-function charging coil bobbin that provides axial shock protection and vibration isolation, reduces the need for expensive and complex frame designs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a resonant drive system with floating rotor is used, then vibration and shock are reduced, but cogging occurs causing undesired at-rest positions
Solution Approach 1:
The resilient motor mount is positioned beforehand to cushion and absorb the forces that cause cogging. The resilient material provides a compliant interface between the motor and frame, preventing the rotor from slipping between permanent magnet positions by dampening the forces that would otherwise cause cogging.
Solution Approach 2:
The resilient motor mount acts as an intermediary element between the motor and the frame. This intermediate component isolates the motor from direct rigid mounting, allowing it to absorb vibrations and shocks while preventing the transmission of forces that cause cogging, thus mediating between the conflicting requirements of vibration reduction and cogging prevention.
2Adaptability or versatility
If multiple injection-molded frame parts are used, then functional requirements are met, but device complexity and cost increase
Solution Approach 1:
The resilient motor mount combines multiple functions into a single component: it serves as both a mounting structure for the motor and a vibration/shock absorption element. The mount arms provide structural support while the resilient bumper provides cushioning, merging what would traditionally be separate frame components and sealing elements into one integrated part.
Solution Approach 2:
The resilient motor mount performs multiple functions simultaneously: it mounts the motor to the frame, absorbs vibrations, cushions axial shocks, and provides sealing surfaces. This multi-functional design eliminates the need for separate components for each function, reducing overall device complexity while meeting all functional requirements.
3Reliability
If separate sealing components are added, then water ingress is prevented, but manufacturing complexity increases
Solution Approach 1:
The resilient motor mount combines sealing functionality with the motor mounting structure. The resilient material inherently provides sealing surfaces where the mount contacts the frame and housing, eliminating the need for separate sealing components while maintaining effective water ingress prevention.
Solution Approach 2:
The resilient motor mount serves as a multi-functional component that simultaneously provides mechanical mounting, vibration absorption, shock cushioning, and sealing. By integrating sealing into the mount structure itself, the design simplifies manufacturing while maintaining reliable protection against water ingress.
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 effectively mitigates vibrations and shocks, prevents cogging, and lowers production costs by using modular, cost-effective parts that enhance the durability of the toothbrush.
Implementation Method 1
The resilient motor mount is arranged to absorb vibrations generated by the motor
Implementation Method 2
a resilient motor mount disposed adjacent to the motor
Implementation Method 3
The resilient motor mount is arranged to absorb axial mechanical shock along a longitudinal axis of the toothbrush
Implementation Method 4
one or more mount arms extending away from the bumper periphery in a direction along the central axis, wherein each mount arm includes a compression surface disposed to be in compressive contact with a motor casing
Implementation Method 5
a bottom bumper having a central axis and a periphery, an axial stop surface disposed at one end of the bottom bumper
Data Source
Figure 1
Figure 2~3A
Figure 3B~3C
AI summary
A resilient motor mount (70) for a power toothbrush (10) configured to limit the axial and rotational displacement of a shaft (60) of a motor (50). The displacement limits are designed to protect the toothbrush(10)from physical damage and to prevent rotational slipped poles, i.e. "cogging" errors, between the permanent magnets and poles of the resonating toothbrush motor(50).