Trochoid Dog Shaft-Hub Connection for Efficient Torque Transfer
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Solution Overview
Problem
Existing shaft-hub connections with polygonal shapes require additional transmission elements, lead to inefficient load transfer angles, and are difficult to manufacture, especially under high loads and in large structural parts.
Innovation Solution
A shaft-hub connection utilizing a contour that extends along a prolonged trochoid, allowing for improved force transmission and manufacturing precision without intermediate elements, enabling efficient torque transmission and economic production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If polygonal shapes with full-surface form-fit are used for dogs, then torque transmission occurs at every point of the contour, but the load transfer angle is not tangential to the centre of structural components and manufacturing is difficult
Solution Approach 1:
The patent changes the geometric parameters of the dog contour from conventional polygonal shapes to a specific curved profile defined by mathematical equations. The contour is characterized by specific radius values (R1, R2, R3) and angle parameters (α, β, γ) that optimize both the load transfer angle to be tangential to the centre and the manufacturability. This parameter optimization allows standard manufacturing processes to achieve the desired precision while improving torque transmission efficiency.
2Reliability
If intermediate elements are used to assure contact contour for torque transmission, then torque transmission is ensured, but the connection becomes more complex and requires additional transmission elements
Solution Approach 1:
The patent extracts and eliminates the intermediate elements (such as keys, splines, or other transmission components) from the shaft-hub connection. Instead, the optimized dog contour itself provides the necessary contact geometry for reliable torque transmission. The mathematical definition of the dog profile ensures proper contact patterns without requiring any additional transmission elements, thereby simplifying the overall connection design while maintaining reliability.
3Power
If precise dog contours are manufactured with complex shapes, then torque transmission efficiency is improved, but production costs increase and manufacturing precision requirements become more stringent
Solution Approach 1:
The patent defines the dog contour with specific mathematical parameters that balance torque transmission efficiency with manufacturability. The contour is described by equations with defined radius values (R1, R2, R3) and angle parameters (α, β, γ) that can be achieved with standard manufacturing tolerances. This parameter selection ensures that the complex curved shape provides optimized power transmission while remaining producible with conventional machining processes and reasonable precision requirements.
Data Source
AI summary
A shaft-hub connection includes an alignment gearing with a plurality of dogs. The dogs comprise a contouring cross-section, which runs, at least partially, along a prolonged trochoid.