Hand-Held Tool Housing Recesses for Vibration Damping
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Solution Overview
Problem
Vibrations in hand-held processing tools are amplified due to deformations at the connection points of multiple housing parts, leading to increased compressive stresses and reduced vibration damping.
Innovation Solution
Incorporating recesses in the side edges of housing parts to create spacing between them, optionally filled with a soft component, and using a tongue-and-groove system or reduced torque screw connections to enhance vibration damping and reduce compressive stresses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If housing parts are directly connected at side edges, then structural rigidity is improved, but vibrations are amplified due to deformations and compressive stresses
Solution Approach 1:
The housing is divided into multiple housing parts with recesses created at the side edges. These recesses segment the contact area between housing parts, preventing continuous direct contact and allowing independent movement of each housing part, thereby reducing vibration amplification while maintaining structural integrity
Solution Approach 2:
The recesses are strategically positioned at specific locations where vibrations occur most intensely. By modifying only the local geometry at these critical points rather than the entire housing structure, the patent achieves vibration reduction while preserving overall structural rigidity
2Object-generated harmful factors
If housing parts are spaced apart with recesses, then vibration damping is improved, but structural rigidity is reduced
Solution Approach 1:
The recesses enable the housing parts to move dynamically relative to each other during operation. This dynamic adjustment allows the housing structure to adapt to vibrational forces, absorbing energy through controlled movements rather than rigid resistance, thus maintaining rigidity while improving vibration damping
3Stability of the object's composition
If screw connections are tightened with high torque, then housing parts are firmly secured, but compressive stresses increase and vibrations are amplified
Solution Approach 1:
The recesses act as pre-designed cushioning elements that accommodate slight misalignments and reduce stress concentrations before they can lead to harmful compressive stresses. By providing this cushioning effect in advance through the geometric design, the patent reduces the need for high tightening torques while maintaining housing stability
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
Optimizes the stiffness adjustment of the mass-spring system, reducing vibrations transmitted to the operator and preventing compressive stresses, while also providing improved grip and protection against dust and fluids.
Implementation Method 1
the at least one recess is at least partially filled with a soft component, in particular an elastomer
Implementation Method 2
the degrees of freedom of the two housing parts in relation to each other can be increased, so that a stiffness adjustment of the resulting mass-spring system is optimized to reduce any vibrations
Data Source
AI summary
A hand-held processing tool with a housing that includes at least two housing parts is disclosed. The housing parts each have a side edge which are directly adjacent to one another in the assembled state of the housing. A recess is provided in at least one partial region of the side edges of at least one of the two housing parts such that the side edges of the at least two housing parts are spaced apart from one another in the at least one partial region.