Dental Hand Piece Decoupling Element Vibration Damping
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Solution Overview
Problem
Existing dental hand pieces, particularly contra-angle hand pieces, face challenges in reducing vibrations and noise emissions due to the amplification of rotating components, with existing solutions being complex and inefficient in design.
Innovation Solution
A dental hand piece design featuring a housing with a decoupling element that provides a springy or damping connection between the housing and the coupling element, preventing rigid coupling and reducing axial bracing, which is simple, cost-effective, and user-friendly, while effectively damping vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a rigid coupling is used between the housing and coupling element, then the connection is stable and reliable, but vibrations and noise emissions are intensified
Solution Approach 1:
A decoupling element is introduced as an intermediary component between the housing and coupling element. This decoupling element provides axial bracing while allowing radial vibrations to be damped, thus mediating between the need for stable connection and the need to reduce vibrations and noise.
2Object-generated harmful factors
If a floating mounting with elastic elements is used, then vibrations are reduced, but the design becomes highly complex
Solution Approach 1:
The complex floating mounting design with multiple elastic elements is replaced by a simplified solution where only essential axial bracing is maintained through the decoupling element, while radial vibration damping is achieved through a simpler construction.
Solution Approach 2:
The coupling system is segmented into distinct functional zones: the decoupling element handles axial bracing while allowing radial vibration damping to occur independently, separating the functions of axial support and radial vibration isolation.
3Device complexity
If elastic elements are provided only on the ends of the grip sleeve, then the design is simpler, but definite axial fixing is not achieved
Solution Approach 1:
The decoupling element is designed with specific material and structural parameters that enable it to provide definite axial fixing through controlled elasticity, while maintaining simplicity in overall design. The parameter optimization allows axial force transmission while permitting radial vibration damping.
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 design effectively reduces vibrations and noise emissions by ensuring the lowest eigenfrequencies of the housing are below audible oscillation frequencies, preventing resonance and improving oscillatory characteristics, and allows for easy maintenance and replacement of components.
Implementation Method 1
Between the first housing end and the coupling element there is arranged a decoupling element, which is strictly springy or springy and damping in the axial direction
Implementation Method 2
the lowest eigenfrequencies of the housing are below the audibly perceivable oscillation frequencies generated in the instrument, so that an increase in the amplitude due to the resonance is avoided
Data Source
AI summary
Dental hand piece, comprising a housing and a drive train with a coupling element for a drive, wherein the housing radially surrounds the drive train and wherein the housing has a first and a second housing end, and wherein the housing is held on the drive train on the first and on the second housing end. Between the first housing end and the coupling element is arranged a decoupling element, which is strictly springy or springy and damping in the axial direction, whereas the second housing end is braced rigidly against the drive train and the housing is braced with respect to the coupling element in the axial direction by means of the decoupling element.