Collet Chuck Assembly for Precise Centering and Torque Transfer
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Solution Overview
Problem
Conventional collet chucks face challenges in achieving optimal precision and concentricity due to loose insertion and separate tightening of the receiving sleeve and screw cap, leading to suboptimal centering and torque resistance, especially in high-speed applications.
Innovation Solution
A collet chuck design where the receiving sleeve and screw cap are permanently connected and able to rotate relative to each other, utilizing rolling elements for direct engagement without an interposed disc, ensuring compulsory centering and high torque transmission, and featuring a compact design with adjustable length and damping capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the receiving sleeve is loosely inserted into the chuck body and the screw cap is tightened separately, then the assembly is simple to manufacture, but the centering precision and concentricity deteriorate
Solution Approach 1:
The patent merges the receiving sleeve and screw cap into a single integrated component. The screw cap is formed as one piece with the receiving sleeve, eliminating the need for separate assembly operations. This integration ensures that the centering projection is automatically positioned correctly relative to the screw cap thread, guaranteeing optimal centering and concentricity while maintaining manufacturing simplicity through a single-component design.
2Manufacturing precision
If the receiving sleeve and screw cap are permanently connected, then the centering precision improves, but the device complexity increases
Solution Approach 1:
The receiving sleeve and screw cap are merged into a single integrated component manufactured as one piece. This integration eliminates the need for separate centering operations and ensures automatic alignment through the built-in centering projection. The single-component design actually reduces device complexity by eliminating the interface and assembly steps between two separate parts.
3Strength
If rolling elements are used for direct engagement between receiving sleeve and screw cap, then the torque resistance improves, but the device complexity increases
Solution Approach 1:
Rolling elements are introduced as intermediary components between the receiving sleeve and screw cap to enable direct engagement. These rolling elements transmit torque efficiently while allowing the integrated component to rotate smoothly during tightening. The rolling elements are embedded within the integrated structure, adding minimal complexity while significantly improving torque transmission capability.
4Force
If the receiving sleeve is compressed more by pressing into the chuck, then the chucking force increases, but the requirement for external presses increases
Solution Approach 1:
The patent employs a conical geometry for the receiving sleeve that transforms the rotational tightening motion of the screw cap into axial compression force. As the integrated component rotates during tightening, the conical surface converts tangential force into increasing axial pressure on the tool shaft. This dynamic force conversion eliminates the need for external presses while achieving high chucking forces through the screwing action alone.
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 design enhances precision, concentricity, and torque resistance, allowing for secure chucking of tools with different shaft diameters without the need for external presses, while maintaining ease of operation and assembly precision.
Implementation Method 1
the receiving sleeve and the screw cap are permanently connected and are able to rotate relative to one another, wherein the receiving sleeve and the screw cap are supported against one another in rotary fashion by means of rolling elements
Implementation Method 2
The receiving sleeve is inserted, together with the tool, into the chuck of the tool holder and is then pressed into the chuck, usually with the aid of a screw cap. The screw cap is moved axially by means of a rotary motion. Due to its conical shape, the receiving sleeve is compressed more, the further it is pressed into the chuck. This elastic deformation in turn constricts the receiving bore
Data Source
AI summary
The invention relates to a collet chuck (1) for clamping a preferably cylindrical tool shank with a chuck body (2) of a collet (3) and an union nut (4), which are matched in such a way that the collet (3) can be driven into the chuck body (2) by tightening the union nut (4) such that it secures the tool shank in the collet chuck (1) ready for operation, wherein the collet (3) and the union nut (4) are permanently connected to one another and at the same time connected in a rotatable manner relative to one another.