Hand Tool Vibration Damping via Segmented Housing
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Solution Overview
Problem
Existing hand tools with rotary-oscillation spindles face challenges in reducing user vibration exposure while maintaining precision and accuracy, as vibration-damping designs often increase weight and compromise guidance accuracy due to the lack of a rigid connection between housing parts.
Innovation Solution
A hand tool design utilizing a deformable, plate-shaped damping element that forms peripheral and axial sections upon assembly, allowing for effective vibration decoupling between the outer and inner housings, thereby reducing felt vibrations and maintaining precise guidance with minimal structural complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If vibration-damping elements are used to decouple the outer and inner housings, then user vibration exposure is reduced, but the guiding accuracy and precision are compromised due to lack of rigid connection
Solution Approach 1:
The housing is divided into outer and inner housings that are vibrationally decoupled through damping elements, allowing independent optimization of vibration isolation and guidance functions
Solution Approach 2:
Different regions of the housing connection have different properties: damping elements provide vibration isolation in non-critical areas while rigid connections maintain precision in guidance-critical areas
2Object-affected harmful factors
If vibration-damping designs are implemented with separate outer and inner housings, then user vibration exposure is reduced, but the weight of the hand tool increases
Solution Approach 1:
Flexible damping elements in the form of thin plates or rings are used to achieve vibration decoupling without adding significant weight, replacing heavier traditional damping structures
Solution Approach 2:
Damping elements are made from composite materials that provide effective vibration damping with minimal weight, optimizing the weight-to-damping-performance ratio
3Manufacturing precision
If a rigid connection between outer and inner housings is used, then guiding accuracy is maintained, but user vibration exposure increases
Solution Approach 1:
The housing connection is segmented into multiple zones with different coupling characteristics, allowing simultaneous achievement of rigid guidance paths and vibration isolation
Solution Approach 2:
Damping elements serve as intermediary components between the outer and inner housings, mediating the transmission of forces while filtering out harmful vibrations
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 user vibration exposure while ensuring precise guidance and accuracy, achieved through the use of a deformable damping element that absorbs and transmits forces between housing parts, enhancing the operational ergonomics and service life of the hand tool.
Implementation Method 1
The outer housing and the inner housing are coupled to each other via at least one deformable damping element which is plate-shaped in an unassembled state
Implementation Method 2
the at least one damping element forms a circumferential section and an axial section in an assembled state
Data Source
Figure 1
Figure 2
Figure 3a~4
AI summary
The invention relates to a hand tool (10), in particular a hand tool (10) having a tool spindle (22) that is drivable in a rotational oscillatory manner, having an outer housing (12), which has at least one grip region (20), having an inner housing (14), which is arranged at least partially in the outer housing (12) and is coupled thereto in a vibrationally damped manner, and having a drive unit (38) with a drive shaft (42) that is drivable in rotation, wherein the drive unit (38) is accommodated in the inner housing (14), wherein the drive shaft (42) defines a drive axis (44) of the hand tool, wherein the outer housing (12) and the inner housing (14) are coupled together via at least one deformable damping element (68) which is formed in a plate-like manner in an uninstalled state, wherein the at least one damping element (68) forms a circumferential portion (72) and an axial portion (74) in a fitted state, wherein the circumferential portion (72) is configured essentially to transmit radial forces between the outer housing (12) and the inner housing (14) in the fitted state, and wherein the axial portion (74) is configured essentially to transmit axial forces between the outer housing (12) and the inner housing (14) in the fitted state.