Tool Coupling with Planetary Speed-Up and Vibration Isolation
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Solution Overview
Problem
Existing tool coupling devices for producing threads or threaded holes face challenges in achieving high concentricity, rigidity, and minimizing vibration sensitivity, particularly when coupled to a drive system.
Innovation Solution
A tool coupling device with an output shaft decoupled from the housing to prevent vibration transmission, featuring a planetary gear transmission and roller bearings for enhanced rigidity and concentricity, along with a design that includes a one-piece rotating body for the output shaft and drive shaft, and a method for producing threads with synchronized rotary and axial movements to create threads without radial feed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the output shaft is coupled to the housing, then the structure is simpler and easier to manufacture, but housing vibrations are transmitted to the tool reducing machining accuracy
Solution Approach 1:
The output shaft is segmented into two independent mounting sections: one coupled to the drive shaft and another coupled to the housing. This segmentation allows the output shaft to be supported by the drive shaft (isolating it from housing vibrations) while maintaining structural connection to the housing for stability, thereby resolving the contradiction between simplicity and vibration isolation.
Solution Approach 2:
The drive shaft acts as an intermediary element between the housing and the output shaft. By coupling the output shaft to the drive shaft rather than directly to the housing, the system uses the drive shaft as a mediator that prevents vibration transmission from the housing to the tool, improving machining accuracy without requiring complete structural redesign.
2Productivity
If a planetary gear transmission is used to increase tool rotational speed, then thread-producing speed increases, but the transmission adds complexity to the device
Solution Approach 1:
The planetary gear transmission is merged with the existing drive shaft structure, where the sun gear is coupled to the drive shaft and the ring gear is coupled to the housing. This integration allows the transmission function to be incorporated into the existing structural framework rather than adding completely separate components, thereby increasing thread-producing speed while minimizing the increase in device complexity.
3Manufacturing precision
If roller bearings are used to support the output shaft on the drive shaft, then rigidity and concentricity are improved, but manufacturing complexity increases
Solution Approach 1:
The roller bearings are positioned such that they automatically self-align and self-adjust during operation, providing consistent concentricity and rigidity. The bearing arrangement allows the output shaft to be precisely supported without requiring extremely tight manufacturing tolerances on the bearing seats, as the bearings themselves compensate for minor misalignments, thereby improving concentricity while maintaining reasonable manufacturing ease.
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 achieves high rigidity and concentricity, reducing the impact of housing vibrations on the tool, allowing for efficient and accurate thread production with improved machining accuracy and speed.
Implementation Method 1
a planetary gear transmission and roller bearings for enhanced rigidity and concentricity
Implementation Method 2
roller bearings for enhanced rigidity and concentricity
Implementation Method 3
an output shaft decoupled from the housing to prevent vibration transmission
Data Source
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AI summary
The tool coupling device for coupling a tool to a drive, in particular a drive of a machine tool, comprises: a) a drive shaft (90) for coupling to the drive; b) an output shaft (12) for coupling to the tool (2), wherein the output shaft rotates or is rotatable about a central axis (A); c) a transmission unit (16) which is connected between the drive shaft and the output shaft and which, according to a transmission ratio, translates a rotary motion of the drive shaft at a drive speed (ns) into a rotary motion of the output shaft at an output speed (nw) that is greater than the drive speed; and d) a non-rotating housing (100); e) wherein the transmission unit (16) and at least a part (95, 95A, 95B, 95C) of the drive shaft coupled to the transmission unit (16), as well as a part (18, 20, 15) of the output shaft coupled to the transmission unit, are located within are arranged in the housing,f) wherein the drive shaft is rotatably mounted on or in the housing and g) wherein the output shaft is rotatably mounted exclusively on or in the drive shaft and is not rotatably mounted on or in the housing.