Quick Tool Clamping Assembly With Secured Torque Transmission
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Solution Overview
Problem
Existing quick-action clamping devices for portable machine tools face challenges in providing a reliable and compact torque transmission mechanism that securely fastens and releases tool units without the need for tools, while ensuring operator safety and maintaining structural simplicity.
Innovation Solution
The proposed quick-action clamping device incorporates a fastening unit with a torque transmission element that is non-rotatably secured to the output shaft using a positive or non-positive connection, featuring a fastening element such as a bolt or rivet, and includes a clamping unit with pivotable clamping elements and a safety unit to prevent unintended movement, ensuring secure attachment and easy operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a torque transmission element is integrated into the output shaft, then the structure is simpler, but the torque transmission reliability is reduced
Solution Approach 1:
The device is divided into separate functional components: the output shaft and the torque transmission element are designed as separate parts that can be independently manufactured and assembled. This segmentation allows each component to be optimized for its specific function while maintaining overall system reliability.
Solution Approach 2:
The torque transmission element is extracted from the integrated output shaft design and made into a separate, removable component. This extraction enables the torque transmission element to be independently secured to the output shaft through fastening units, thereby improving torque transmission reliability while maintaining structural simplicity through modular design.
2Reliability
If a fastening unit is added to secure the torque transmission element, then the torque transmission reliability is improved, but the device complexity increases
Solution Approach 1:
The fastening unit is merged with the torque transmission element as an integrated assembly. The fastening elements are positioned to directly engage with corresponding features on the output shaft, creating a unified fastening-torque transmission subsystem that reduces the number of separate components and simplifies the overall device structure.
Solution Approach 2:
The fastening unit is designed to automatically secure the torque transmission element to the output shaft through self-aligning features and engagement mechanisms. This self-service design eliminates the need for additional adjustment or complex fastening procedures, thereby improving reliability without significantly increasing device complexity.
3Reliability
If the torque transmission element is designed separately from the output shaft, then the torque transmission reliability is improved, but the manufacturing cost increases
Solution Approach 1:
The torque transmission element is designed as a universal component that can be applied to various output shaft configurations. The standardized fastening unit and torque transmission element combination can be used across different device variants, enabling economies of scale in manufacturing and reducing overall production costs despite the increased component count.
Data Source
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Figure 3a~3b
AI summary
The invention relates to a quick tensioning device for a portable machine tool, in particular for an angle grinding machine, comprising at least one output shaft (14) which can be rotated in particular, comprising at least one clamping unit (16) that is at least partly arranged in the output shaft (14) and has at least one clamping element (24, 26), which is movably mounted at least about and/or along a movement axis (20, 22) of the clamping unit (16), for fixing an insert tool unit (18) to the output shaft (14) without tools, and comprising at least one torque transmission unit (28) for transmitting a torque to the insert tool unit (18) when the insert tool unit (18) is arranged on the output shaft (14), said torque transmission unit having at least one torque transmission element (30, 32) which is formed separately from the output shaft (14) in particular. The quick tensioning device comprises at least one securing unit (34) at least for securing the torque transmission element (30, 32) to the output shaft (14) in a rotationally fixed manner in particular.