Damping Elements in Hammer Drill Sleeve Mounting
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Solution Overview
Problem
Existing motor-driven power tools with rotary hammer mode experience operational discomfort due to axial forces transmitted from the hammer mechanism to the drill sleeve and subsequently to the user, leading to vibration and reduced efficiency.
Innovation Solution
The drill sleeve is axially supported by flexible, elastically deformable damping elements on both sides, which absorb periodic axial forces and provide prestress in opposite directions, ensuring a play-free mounting and reduced vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the drill sleeve is rigidly mounted in the machine housing, then structural stability is maintained, but axial forces from the hammer mechanism cause vibration and operational discomfort
Solution Approach 1:
A damping element is introduced as an intermediary component between the drill sleeve and the machine housing. This damping element absorbs and dissipates the periodic axial forces generated by the hammer mechanism, preventing direct transmission of vibrations to the user while maintaining the structural connection between components.
Solution Approach 2:
The mounting system transitions from a rigid connection to a flexible connection by changing the mechanical properties of the interface. The damping element provides elastic deformation that allows the drill sleeve to move slightly in response to axial forces, converting harmful vibrational energy into elastic potential energy and heat.
2Ease of operation
If damping elements are added to reduce axial forces, then vibration is reduced, but device complexity increases
Solution Approach 1:
The damping element is implemented as a flexible component that can be integrated into the existing mounting structure. This flexible element provides vibration damping while maintaining a relatively simple overall structure, avoiding the need for complex active control systems or multiple separate components.
3Manufacturing precision
If the drill sleeve is held without axial play, then positioning precision is improved, but the ability to absorb axial forces is reduced
Solution Approach 1:
The damping element changes the mechanical parameters of the mounting interface by providing controlled elasticity. This allows the drill sleeve to maintain precise positioning while the elastic material absorbs axial forces through deformation, preventing force transmission to the user.
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
This solution enhances operational smoothness and efficiency by minimizing vibrations and compensating for production tolerances, resulting in higher single impact energy values and reduced power loss across all operating modes.
Implementation Method 1
flexible, elastically deformable damping element
Implementation Method 2
the drill sleeve vibrates to a much lesser extent than is the case with known hammer drills
Implementation Method 3
the damping elements exert a prestress directed in opposite directions on the drill sleeve, so that it is held without axial play in relation to the machine housing
Data Source
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AI summary
The device has an output strand (6) comprising a boring sleeve (10) and a forge. The boring sleeve is radially supported in a rotatable manner around a longitudinal axis in relation to a machine housing (33). The boring sleeve is axially supported via a roller bearing arrangement for receiving of axial forces that are induced at a tool. The boring sleeve is held in the machine housing at both axial sides by axial acting soft and elastic deformable damping elements (34, 36), which are designed in a circular disk type. The damping elements are made of plastic material/polyurethane foam.