Spindle-Locking Device Viscoelastic Ring Rattle Reduction
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Solution Overview
Problem
Handheld machine tools with spindle-locking devices exhibit non-uniform response behavior and a tendency to rattle due to high moment of inertia, leading to noise generation, especially when using heavy tool inserts.
Innovation Solution
Incorporating a viscoelastic ring as a positioning element between the spindle cylinder and clamping surface, which reduces the influence of manufacturing tolerances, gravity, and magnetism, allowing for improved response behavior and reduced rattling without affecting the tool's efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a spindle-locking device is used to prevent rotation of the drive spindle, then the chuck can be opened and closed using one hand and ratchet operation is enabled, but the device exhibits non-uniform response behavior with torsion angles varying between 6° and more than 360°
Solution Approach 1:
The positioning element is pre-installed on the clamping surface at a specific position before the spindle-locking operation. This preliminary positioning ensures that when the spindle cylinder moves toward the blocking element, it is guided to engage at the correct location, eliminating the variability in torsion angles and ensuring uniform response behavior while maintaining one-hand operation capability.
2Productivity
If the drive spindle has a great moment of inertia to enable heavy tool inserts, then processing capability is improved, but the spindle-locking device displays a rattling tendency and may enter intermittent spindle-lock operation
Solution Approach 1:
The positioning element acts as an intermediary between the spindle cylinder and the blocking element. It guides the spindle cylinder to engage precisely with the blocking element at the correct position, preventing misalignment and the resulting rattling and intermittent locking operations. This allows the system to handle heavy tool inserts with high moment of inertia without generating harmful rattling noises.
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 viscoelastic ring enhances the spindle-locking device's response behavior and minimizes rattling, providing a robust and cost-effective solution that maintains the tool's overall efficiency.
Implementation Method 1
Incorporating a viscoelastic ring as a positioning element between the spindle cylinder and clamping surface, which reduces the influence of manufacturing tolerances, gravity, and magnetism
Data Source
AI summary
In a handheld machine tool having a tool housing, in which a drive motor is situated for driving a drive element equipped with at least one clamping surface, to which a spindle-locking device equipped with a blocking element and at least one spindle cylinder is assigned, the at least one spindle cylinder being able to be clamped in a spindle-lock operation of the spindle-locking device between the at least one clamping surface and the blocking element to prevent the drive element from rotating relative to the tool housing, wherein a positioning element associated with the spindle locking device is situated at least in sections on the at least one clamping surface, the positioning element being situated at least partially in the region between the at least one spindle cylinder and the at least one clamping surface.