Roller Chucking Nut Structure for High-Force Tool Clamping
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Solution Overview
Problem
Conventional collet chucks require small thread pitches for high axial force, leading to long screwing distances and high frictional forces, limiting chucking forces and restricting the chucking region to smaller tool diameters.
Innovation Solution
A chucking apparatus with a chucking nut featuring axially rotatable roller bodies that engage with a basic body engagement structure, reducing frictional forces and allowing for higher chucking forces with a shorter screwing distance, enabling the chucking of larger diameter objects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a small thread pitch is used to achieve high axial force, then the required axial force for pressing the collet into the receiving space is achieved with little effort, but the screwing distance becomes relatively long and high frictional forces have to be overcome
Solution Approach 1:
The patent introduces roller bodies as intermediary elements between the chucking nut and the basic body. These rollers convert the sliding friction of a conventional thread into rolling friction, significantly reducing the frictional forces that must be overcome during screwing. This allows for a larger thread pitch and shorter screwing distance while still achieving the required axial force for collet compression.
2Force
If a small thread pitch is used to achieve high axial force, then the required axial force for pressing the collet into the receiving space is achieved with little effort, but high frictional forces have to be overcome over a long screwing distance
Solution Approach 1:
The roller bodies act as intermediary elements that replace the direct sliding contact of a conventional thread with rolling contact. This substitution dramatically reduces frictional losses, as rolling friction is significantly lower than sliding friction. The engagement structures on the rollers interface with both the chucking nut and basic body, enabling force transmission with minimal energy loss.
3Device complexity
If conventional collet chuck design is used, then simple structure is maintained, but lower chucking forces are achieved compared to shrink fit chucks
Solution Approach 1:
The patent incorporates roller bodies as intermediary elements between the chucking nut and basic body, converting sliding friction to rolling friction. This reduction in frictional resistance allows significantly higher axial forces to be applied to the collet during compression, achieving chucking forces comparable to or exceeding those of shrink fit chucks while maintaining a relatively simple mechanical structure.
4Device complexity
If conventional collet chuck design is used, then simple structure is maintained, but the chucking region is restricted to smaller tool diameters
Solution Approach 1:
By introducing roller bodies that reduce frictional forces, the system can generate sufficiently high axial forces to compress collets for larger diameter tools. The reduced friction allows the screwing mechanism to overcome the increased torque requirements associated with larger tool diameters, thereby expanding the chucking region beyond the limitations of conventional collet chucks.
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 enables simple and effective chucking of objects with high forces, reducing the effort required for rotational actuation and allowing for reliable chucking of larger diameter tools by minimizing sliding friction and optimizing the screw thread design.
Implementation Method 1
high frictional forces have to be overcome over a long screwing distance because of the small thread pitch... reducing the effort required for rotational actuation and allowing for reliable chucking of larger diameter tools by minimizing sliding friction
Data Source
AI summary
A chucking apparatus for chucking an object contains a basic body which has a receiving space in which the object can be disposed. A chucking device is provided with a chucking nut which is screwable onto the basic body and by the chucking nut being screwed onto the basic body the object disposed in the receiving space can be chucked non-rotatably. The chucking nut has a plurality of roller bodies having a defined roller engagement structure. The roller bodies are held in an axially rotatable manner on a chucking body of the chucking nut and are arranged distributed in the circumferential direction on the chucking nut. The rollers by their roller engagement structure are in engagement with the basic body engagement structure of the basic body.