Hand-Held Power Tool Elastomer Bearings Vibration Decoupling
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Solution Overview
Problem
Hand-held power tools experience significant vibrations and shocks due to the direct transmission of drive motor movements, leading to user discomfort and potential tool damage, which existing technologies have not adequately addressed.
Innovation Solution
A hand-held power tool design featuring a movement-transmitting structural unit for partial decoupling between the drive motor and transmission, combined with elastomer bearings mounted inside the motor housing for vibration damping, allowing for tolerance compensation and reduced vibration transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the drive motor is directly coupled to the transmission, then the structure is simple and easy to manufacture, but vibrations and shocks are directly transmitted leading to user discomfort and potential tool damage
Solution Approach 1:
A movement-transmitting structural unit is introduced between the drive motor and the transmission. This intermediary structure includes elastomer elements that provide vibration decoupling while still transmitting the drive movement, thus resolving the contradiction between structural simplicity and vibration reduction
Solution Approach 2:
The structural unit changes the mechanical coupling parameters between motor and transmission by incorporating elastomer elements with specific material properties (viscoelasticity, damping characteristics) that allow movement transmission while filtering vibrations
2Object-affected harmful factors
If vibration decoupling measures are implemented, then user comfort and tool stability are improved, but the device complexity increases
Solution Approach 1:
The movement-transmitting structural unit combines multiple functions into a single integrated component: it serves as both the mounting structure for the drive motor and the vibration decoupling element, eliminating the need for separate bearing components and reducing overall device complexity
Solution Approach 2:
The structural unit performs multiple functions simultaneously: mechanical support, movement transmission, vibration decoupling, and tolerance compensation, making each component highly versatile and reducing the total number of parts required
3Object-affected harmful factors
If elastomer bearings are molded onto the motor housing, then vibration decoupling between motor and housing is achieved, but manufacturing precision requirements increase
Solution Approach 1:
The solution uses composite construction by molding elastomer material directly onto the motor housing, creating a hybrid structure that combines the rigidity of the housing with the vibration-damping properties of the elastomer, achieving vibration decoupling while maintaining manufacturability
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 reduces vibrations and shocks by decoupling motor vibrations from the transmission, enhancing user comfort and tool stability while simplifying assembly and manufacturing through integrated elastomer bearings.
Implementation Method 1
The elastomer bearing at least partially decouples the vibrations emitted by the motor from the motor housing
Implementation Method 2
at least two elastomer elements are molded onto the inside of the motor housing, which form elastomer bearings for mounting the drive motor in the motor housing
Implementation Method 3
A movement-transmitting structural unit is arranged between the drive motor and the transmission, via which at least a partial decoupling between the drive motor and the transmission is achieved
Implementation Method 4
The decoupling takes place in the axial direction, ie in the direction of the longitudinal axis of the motor, and/or in the radial direction
Data Source
AI summary
A hand-held power tool with a drive motor (10) and a gear mechanism (11) has elastomer elements (20, 21) moulded onto the inner side of the housing (2). At least two elastomer elements form elastomer bearings for bearing the drive motor.