Clamping Ring Hollow Shaft Connection for Balanced High Torque
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Solution Overview
Problem
Existing connections for planetary gear systems fail to provide a balanced, high-torque non-positive connection efficiently on the fast-rotating side, especially when integrating a shaft and a hollow shaft with a ring part, leading to inefficiencies in mass distribution and manufacturing complexity.
Innovation Solution
A connection design featuring a shaft partially inserted into a hollow shaft with a clamping ring that includes a conical chamfer and axial slots, allowing for a non-positive connection by shrinking the ring part onto the hollow shaft using a screw, which is balanced and manufactured with reduced mass moment of inertia, and featuring a radially continuous slot for screw passage and radial bore for balancing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a ring part is used to create a force-fit connection on the driving side of a planetary gear, then connection torque can be achieved, but the connection becomes unbalanced and has high moment of inertia
Solution Approach 1:
The ring part is segmented with axial slots that divide the continuous ring structure into sections. This segmentation reduces the overall mass and moment of inertia of the ring part while maintaining its clamping function. The slots allow the ring to be lighter without compromising the force-fit connection capability.
Solution Approach 2:
The ring part features a chamfered region with locally reduced inner diameter that creates a interference fit zone. This local quality change allows the ring to generate high connection torque through the chamfered interference fit area while the rest of the ring structure remains lighter, thus reducing overall moment of inertia.
2Strength
If the ring part is shrunk onto the hollow shaft to achieve high connection torque, then connection strength increases, but manufacturing complexity increases
Solution Approach 1:
The inner diameter of the ring part is designed with a chamfer that creates a gradual transition in diameter, forming an interference fit zone. This parameter change from constant to variable diameter allows the ring to be shrunk onto the hollow shaft with controlled deformation, achieving high connection strength while simplifying the manufacturing process through a systematic geometric transition.
3Stability of the object's composition
If axial slots are added to the hollow shaft to reduce moment of inertia, then balance improves, but structural complexity increases
Solution Approach 1:
Axial slots are introduced into the hollow shaft structure, dividing it into segmented regions. This segmentation reduces the moment of inertia and improves rotational balance by redistributing mass away from the rotational axis. The slots are strategically positioned to maintain structural integrity while achieving balance objectives.
4Force
If the ring part is designed with a chamfer to enable shrinking, then connection torque increases, but manufacturing precision requirements increase
Solution Approach 1:
The chamfer creates a controlled parameter change in the inner diameter of the ring part, transitioning from a larger diameter at the opening to a smaller diameter at the contact surface. This geometric progression allows for systematic manufacturing with standardized tooling, reducing the need for ultra-precise machining while still achieving the required interference fit for high connection torque.
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 high connection torque with minimal effort while maintaining balance and simplicity in manufacturing, ensuring the connection is effective and efficient on the fast-rotating side of the planetary gear system.
Implementation Method 1
The force-fit connection is effectively achieved by tightening the screw, thereby shrinking the ring part onto the hollow shaft
Implementation Method 2
the chamfer is designed as a conical chamfer, which is formed by rotating a curved section of an ellipse, wherein the chamfer transitions smoothly into the region of the ring part that contacts the hollow shaft
Data Source
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AI summary
Coupling comprising a shaft inserted at least partially into a hollow shaft and a ring slipped onto the hollow shaft, in particular a clamping ring, and a planetary gearset, wherein the ring is axially delimited by a collar formed on the shaft, in particular a radially protruding collar, and/or the ring abuts a collar or the shaft collar, in particular a collar formed on the shaft, in particular a radially protruding collar, the hollow shaft having slits spaced apart from the collar, in particular axial slits, the ring comprising a chamfer, in particular at its annular opening and/or in particular in its axial end region facing the collar, such that the inner diameter of the ring in the axial region covered by the chamfer is greater than the inner diameter in the axial region in which the ring contacts the hollow shaft.