Twisted Spline Toothing for Deflection Angle Torque Transmission
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Solution Overview
Problem
Existing drive spindle systems in rolling mills face challenges in transmitting increased torque due to the small diameter of work rolls, leading to energy losses and edge wear, which limits the deflection angle and torque transmission capabilities.
Innovation Solution
A spline design with a modified toothing that allows for a deflection angle between the toothing and a complementary toothing, featuring parabolic reductions in tooth roots and tips, and a curved generatrix, which optimizes torque transmission by reducing edge wear and distributing load evenly over the tooth height.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the diameter of work rolls is increased to transmit higher torque, then torque transmission capability is improved, but energy losses increase and the roll stand must be designed stronger
Solution Approach 1:
The patent applies a twisted toothing design where the tooth flanks are curved along the generatrix, creating a three-dimensional twisted surface. This curvature allows the contact line to be distributed along the tooth height, enabling higher torque transmission without increasing work roll diameter, thus avoiding the energy losses associated with larger rolls
2Adaptability or versatility
If cardanic joints are used between drive spindle and roller, then angular misalignment is accommodated, but torque transmission capability is insufficient
Solution Approach 1:
The twisted toothing with curved tooth flanks and distributed contact line provides both angular adaptability and high torque transmission capability in a single integrated design, eliminating the need for cardanic joints that limit torque transmission
3Adaptability or versatility
If classic toothing is used at a deflection angle, then deflection angle is achieved, but edge wear occurs which limits torque transmission
Solution Approach 1:
The twisted toothing design with curved tooth flanks distributes the contact line along the tooth height, preventing concentration of stresses at the edges. This curvature geometry eliminates edge wear even at deflection angles up to 45 degrees, significantly improving reliability
Solution Approach 2:
The patent transitions from traditional two-dimensional tooth profiles to a three-dimensional twisted toothing where the contact line is distributed along the tooth height. This dimensional change from point/line contact to distributed line contact along the generatrix prevents edge wear and enables high torque transmission at deflection angles
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
The invention relates to a toothing (1), in particular of a drive spindle for driving a roll (13) in rolling mills or continuous casting plants, which comprises several teeth (2) and meshes with a second toothing in the manner of a spline, wherein a flank line (12) of the teeth (2) has a curvature and a deflection angle is formed between the rotational axis of the second toothing and the rotational axis of the toothing, wherein the toothing (1) is designed as having at least one of the following modifications: a tooth root relief of the teeth (2), and/or a tooth tip relief of the teeth (2), and/or a twist of the teeth (2).