Pole-Casing Damper Structure for Brushcutter Vibration Isolation
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Solution Overview
Problem
Existing work equipment, such as brushcutters and hedge trimmers, suffer from significant vibrations due to misalignment between the motor output shaft and the tool rotation shaft, which are transmitted through the support pole to the user, causing discomfort.
Innovation Solution
A damper element is integrated into the casing of the work apparatus, positioned between the casing and the support pole, comprising an annular body made of a yielding material like NBR, with abutment teeth in the casing to enhance vibration damping and absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a damper element is added between the casing and the support pole, then vibration damping is improved, but device complexity increases
Solution Approach 1:
A damper element is introduced as an intermediary component between the casing and the support pole. This damper element absorbs and dissipates vibration energy, preventing direct transmission of vibrations from the motor assembly through the support pole to the user's hand, thereby reducing harmful vibrations while maintaining structural integrity
Solution Approach 2:
The damper element is made of elastomeric material that combines damping properties with structural functionality. This composite approach allows the damper to effectively absorb vibrations across a range of frequencies while maintaining the necessary mechanical strength and flexibility for the application
2Stability of the object's composition
If the casing is rigidly fixed to the support pole, then structural stability is improved, but vibration transmission increases
Solution Approach 1:
The rigid connection between the casing and support pole is segmented by introducing a separate damper element. This segmentation allows the connection to maintain structural stability through the damper's load-bearing capacity while simultaneously providing vibration isolation through the damper's elastomeric properties
Solution Approach 2:
The connection parameters are changed from purely rigid to a combination of rigid and flexible properties. The damper element modifies the mechanical impedance of the connection, allowing it to remain stable under static and dynamic loads while changing the vibration transmission characteristics to reduce harmful frequencies
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 damper element effectively limits and absorbs vibrations transmitted from the motor to the support pole, providing a simple and rational solution that enhances user comfort by reducing oscillations.
Implementation Method 1
a damper element interposed between said casing and said work apparatus and said pole, which is adapted to dampen/absorb the vibrations generated by said work apparatus and that are transmitted by said casing to said pole
Data Source
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AI summary
A work equipment (10) is described comprising a pole (20) for supporting a work apparatus (W), wherein the work apparatus (W) comprises: a. a work tool (55), b. a motor (45) adapted to activate the work tool (55), c. a casing (60) rigidly fixed to one end of the pole (20), and adapted to contain the motor (45), characterized in that the work equipment (10) comprises a damper element (85) interposed between the casing (60) and the pole (20).