Clamping Device Coupling Module for Hand-Held Power Tools
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Solution Overview
Problem
Clamping devices for tool disks on hand-held power tools often experience spontaneous release and loosening during operation, leading to instability and safety concerns.
Innovation Solution
A clamping device with a screw mounted in a coupling module that pairs positively with the drive spindle for conjoint rotation, featuring a hexagonal profile and an angular contact ball bearing for increased clamping force and security, along with a spring plate and elastomer ring for enhanced stability and thermal compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a screw is used to clamp the tool disk on the drive spindle, then the clamping force can be adjusted, but the clamping device may spontaneously release and loosen during operation
Solution Approach 1:
The clamping device is divided into functionally independent segments: the screw for axial clamping force, the coupling module with internal contour for rotational coupling, and the flange for mounting. This segmentation allows each component to specialize in its function while collectively preventing spontaneous release through multiple engagement points.
Solution Approach 2:
The coupling module acts as an intermediary element between the screw and the drive spindle. It receives the rotational motion from the drive spindle through its internal contour pairing and transmits it to the screw, preventing the screw from loosening while maintaining the axial clamping force.
2Reliability
If a flange is used to mount the tool disk, then the tool disk can be securely mounted, but the flange may rotate independently of the drive spindle
Solution Approach 1:
The flange features an asymmetric external contour with a hexagonal profile that pairs with a corresponding internal hexagonal contour in the coupling module. This asymmetric pairing prevents independent rotation of the flange relative to the drive spindle while maintaining secure mounting through the axial clamping function.
3Reliability
If additional assembly tools are used to secure the clamping device, then the clamping device can be firmly secured, but the handling and assembly process becomes more complex
Solution Approach 1:
The coupling module integrates multiple functions into a single component: it provides the internal contour for rotational coupling with the drive spindle, serves as the mounting interface for the screw, and acts as the flange structure. This merging eliminates the need for separate assembly tools while maintaining firm securing through the integrated design.
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 provides secure axial clamping of the tool disk, preventing unintentional release and maintaining stability during tool operation, while simplifying handling and eliminating the need for additional assembly tools.
Implementation Method 1
The screw is mounted in the coupling module by means of a rolling bearing. An increased clamping force of the clamping device is obtained by virtue of the fact that head friction of the clamping element can be reduced with the aid of the rolling bearing.
Implementation Method 2
the clamping device obtains increased insensitivity to settling since the spring plate is in nonpositive engagement with the tool disk, which compensates thermal expansion
Data Source
AI summary
A clamping device (10) for the axial (AR) clamping of a tool disk (300) on a flange (30) associated with a drive spindle (20) of a hand-held power tool (100), wherein the clamping device (100) has a screw (2), which is to be screwed into an internal thread (22) of the drive spindle (20) to securely clamp the tool disk (300), wherein the screw (2) is mounted in a coupling module (1) of the clamping device (10), wherein the coupling module (1) has an internal contour (16) which is paired or can be paired positively with the drive spindle (20) for conjoint rotation in the circumferential direction (U).