Drive Spindle Toothing Twist for Deflection Angle Torque
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Solution Overview
Problem
Existing spline toothings in drive spindles for rolling mills face challenges in transmitting increased torque at an angle, leading to edge loading and reduced torque transmission, which limits the ability to increase working roll diameters and efficiency.
Innovation Solution
The teeth are modified with a twist in the form of a profile angle deviation over the tooth width, combined with relief of the tooth root and tip, to reduce edge loading and enhance torque transmission, allowing for a greater deflection angle and increased torque capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If classical toothings are used in drive spindles, then the structure is simple and easy to manufacture, but edge loading occurs which causes very high wear and prevents transmission of desired high torque
Solution Approach 1:
The patent applies different profile modifications to different regions of the tooth: the working portion maintains the classical involute profile for proper meshing, while the root and tip regions are relieved to eliminate edge loading. This local differentiation allows the tooth to simultaneously achieve proper engagement and reduced stress concentration at critical regions.
Solution Approach 2:
The patent modifies the tooth profile parameters by applying relief at the root and tip, changing the geometric parameters from the standard involute profile. This parameter change eliminates the edge loading condition while maintaining the fundamental meshing characteristics of the classical toothing.
2Force
If the deflection angle between drive spindle and roll is increased, then greater torque transmission is desired, but the carrying section of the flank becomes smaller reducing torque transmission capability
Solution Approach 1:
The patent applies relief modifications specifically at the root and tip regions of the tooth, leaving the carrying section (flank) intact. This local quality approach preserves the strength of the flank while eliminating edge loading at the root and tip, enabling greater deflection angles without compromising torque transmission capability.
3Force
If working roll diameters are increased to transmit greater torque, then torque transmission improves, but working roll diameters need to be increased which leads to energy losses and requires more robust rolling mill stand
Solution Approach 1:
The patent changes the tooth profile parameters by applying relief at the root and tip, which eliminates edge loading and enables the existing working rolls to transmit greater torque. This parameter modification allows increased torque transmission without increasing roll diameter, thereby avoiding the associated energy losses and structural requirements.
Data Source
AI summary
A toothing, in particular of a drive spindle for driving a roll in rolling mills or continuous casting plants, which has several teeth and meshes with a second toothing in the manner of a spline, wherein a flank line of the teeth has a curvature, and a deflection angle is formed between the rotational axis of the second toothing and the rotational axis of the drive spindle toothing, and wherein the teeth of drive spindle toothing have a twist in form of profile angle deviation over the tooth width in the flank direction.