Integrated Locking and Bearing Mechanism for Compact Screwdrivers
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Solution Overview
Problem
Hand-held machine tools, such as screwdrivers, face challenges in compact design and cost reduction due to the separate components of locking and rotational bearing devices, which increase component parts, assembly complexity, and space requirements.
Innovation Solution
The integration of the locking device and rotational bearing device into a single component, with a clamping ring providing a bearing surface for direct support and a rolling contact bearing element to reduce friction and enhance support, allows for a more compact and cost-effective design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the locking device and rotational bearing device are formed as separate components, then each component can be optimized independently, but the overall device complexity and number of parts increases
Solution Approach 1:
The locking device and rotational bearing device are merged into a single integrated component. The locking device includes a locking element and a bearing element that rotationally supports the power take-off unit, eliminating the need for a separate rotational bearing device and reducing overall part count
2Ease of repair
If the locking device and rotational bearing device are formed as separate components, then assembly and disassembly can be done independently, but assembly expenditure and time increase
Solution Approach 1:
By integrating the locking and bearing functions into one component, the number of assembly steps is reduced. The single integrated component requires fewer mounting operations and eliminates the need to separately position and secure a separate bearing device, thereby reducing assembly time and expenditure
3Adaptability or versatility
If separate locking and bearing devices are used, then functional independence is maintained, but space requirements and overall length increase
Solution Approach 1:
The locking element and bearing element are combined in a single integrated component where the bearing element is positioned to rotationally support the power take-off unit while the locking element provides the locking function. This integration eliminates the need for separate axial spacing between independent components, thereby reducing the overall length of the device
Solution Approach 2:
The bearing element is positioned within the locking device structure such that it nestles into the available space, allowing the locking and bearing functions to occupy overlapping or adjacent spatial zones rather than requiring separate axial spaces, thus compacting the overall device length
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 reduces the overall length of the hand-held machine tool, minimizes component parts and assembly costs, and provides reliable and efficient power transmission with reduced friction, while maintaining structural simplicity and robustness.
Implementation Method 1
a rolling contact bearing element to reduce friction and enhance support
Implementation Method 2
to reduce friction and enhance support
Data Source
AI summary
A hand-held machine tool device, in particular, for a screwdriver (12a-h), having a locking device (14a-h) for locking a power take-off unit (16a-h), and having a rotational bearing device (18a-h) of the power take-off unit (16a-h). It is provided that at least part of the locking device (14a-h) and the rotational bearing device (18a-h) be formed in one piece.