Hand-Held Power Tool Locking Element for Radial Force Support
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Solution Overview
Problem
Existing hand-held power tools face challenges in effectively supporting radial clamping forces and reducing mechanical and thermal stresses on housing components, particularly in plastic housings, while maintaining a space-saving and lightweight design.
Innovation Solution
A locking element, preferably a clamping ring made of metallic material, is integrated into the hand-held power tool device to provide radial clamping forces and axial securing capabilities, which can be fastened using screws or press-fitted into the housing unit, and is designed to work in conjunction with a pivot bearing unit for enhanced reinforcement and stress reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a locking element is used to support radial clamping forces, then the bearing forces are supported effectively, but the mechanical and thermal stresses on housing parts increase
Solution Approach 1:
The locking element acts as an intermediary component between the bearing and the housing. It receives and supports the bearing forces directly, preventing these forces from being transmitted to the plastic housing parts. This mediator approach allows the housing to remain lightweight while still handling the mechanical and thermal stresses through the metallic locking element.
Solution Approach 2:
The solution combines different materials strategically: the locking element is made of metallic material to handle high mechanical and thermal stresses, while the housing can be made of lighter plastic material. This composite material approach allows each component to be optimized for its specific function - the metal locking element for stress resistance and the plastic housing for weight reduction.
2Stress or pressure
If housing parts are made robust to support bearing forces, then the mechanical and thermal stresses are reduced, but the device becomes heavier and larger
Solution Approach 1:
The locking element serves as a mediator that takes over the stress-bearing function from the housing. This allows the housing to be designed with minimal weight while the locking element, being metallic and optimized for this specific function, handles all the mechanical and thermal stresses without requiring the housing to be robust.
3Reliability
If the locking element is affixed without play in the radial direction, then the bearing forces are supported without play, but the manufacturing precision requirements increase
Solution Approach 1:
The solution changes the radial play parameter from a larger value to less than 0.1 mm, and preferably to less than 0.05 mm. This parameter optimization allows the locking element to support bearing forces effectively without excessive play, while keeping the manufacturing precision requirements within achievable limits for mass production.
Data Source
AI summary
The invention is based on a hand-held power tool device equipped with a locking device. The locking device is provided for locking an output device and has at least one locking element for supporting at least one radial clamping force. According to a proposed embodiment, the locking element is provided to fasten and/or axially secure at least one component.