Clamping Ring Coupling for High-Torque Hollow Shaft Balance
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Solution Overview
Problem
Conventional couplings for planetary transmissions face challenges in achieving high coupling torque with minimal mass and balanced rotational symmetry, particularly on the rapidly rotating input side, while maintaining well-defined contact conditions and uncomplicated production processes.
Innovation Solution
A coupling design featuring a shaft partially inserted into a hollow shaft with a clamping ring that includes a radially projecting collar, axial slots in the hollow shaft, and a chamfered ring part, where a screw part exerts pressure on a flattened region of the hollow shaft, providing a balanced, nonpositive coupling with high torque and defined contact points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a conventional coupling design is used for the input side of a planetary transmission, then the coupling torque can be achieved, but the mass is high and rotational balance is difficult to achieve
Solution Approach 1:
The coupling is divided into separate components: a ring part with threaded bore, a screw part for tightening, and a hollow shaft with slots. This segmentation allows each component to be optimized independently for mass and balance while achieving the required coupling torque through their coordinated interaction.
Solution Approach 2:
The ring part undergoes parameter change through tightening the screw part, which induces shrinking of the ring part onto the hollow shaft. This transformation from a loose fit to a shrunk-fit connection enables high coupling torque with minimal mass, as the ring part deforms to create a strong interference fit.
2Ease of manufacture
If the ring part is made with uniform radial width for simple production, then manufacturing is uncomplicated, but rotational balance may be compromised
Solution Approach 1:
The ring part is designed with asymmetric features: a chamfer on the inner side at the axial end region and slots in the hollow shaft positioned at specific circumferential locations. These asymmetric elements create intentional imbalance in mass distribution that can be used for balancing the rotating assembly, while the overall radial width remains uniform for simple production.
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 a balanced, high-torque coupling with minimal mass and well-defined contact conditions, allowing for uncomplicated production and effective shrink-fitting of the hollow shaft onto the inserted shaft, while maintaining rotational symmetry and elasticity.
Implementation Method 1
The screw part (2), in particular a set screw and/or threaded pin, is screwed into a radially uninterrupted threaded bore of the ring part (1) and exerts pressure on the hollow shaft (40). The hollow shaft (40) is able to be shrunk onto the shaft (30) inserted into it.
Implementation Method 2
The hollow shaft (40) has slots (40a), in particular axial slots, which are set apart from the collar (41). The hollow shaft (40) is more elastic in the slotted region than in the other region.
Data Source
AI summary
A coupling includes a shaft at least partially inserted into a hollow shaft and a ring part, in particular of a clamping ring, slipped onto the hollow shaft. The ring part is axially restricted by a collar provided on the shaft, in particular a radially projecting collar, and/or the ring part is resting against a collar, or the collar, of the shaft, in particular against a collar provided on the shaft, in particular a radially projecting collar. The hollow shaft has slots, in particular axial slots, which are set apart from the collar. The ring part has a chamfer, in particular on its inner side and/or at its ring opening and/or in particular in its axial end region facing the collar, so that the inner diameter of the ring part in the axial region covered by the chamfer is greater than the inner diameter in the particular axial region in which the ring part is in contact with the hollow shaft. The ring part has a radially uninterrupted threaded bore into which a screw part, in particular a set screw and/or a threaded pin, is screwed, which exerts pressure on the hollow shaft.