Shiftable Rolling Mill Transmission for Low-Vibration Torque Transfer
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Solution Overview
Problem
Conventional spur gear-pinion drives in rolling mill technology experience vibration excitation issues, particularly at high speeds, leading to productivity and quality losses due to mass inertia and dynamic behavior problems, which are exacerbated by the use of ratio-increasing or ratio-reducing stages with a gear ratio of one.
Innovation Solution
A shiftable transmission with two stages, featuring a first clutch that connects the input and first output shafts rigidly without gearing for direct torque transmission, and a second clutch that engages spur gears for ratio adjustment, eliminating toothings and inertial masses to improve dynamic behavior and reduce vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional spur gear-pinion drives with ratio-increasing or ratio-reducing stages are used, then torque transmission is achieved, but vibration excitation and mass inertia increase, adversely affecting dynamic behavior and product quality
Solution Approach 1:
The patent removes the ratio-increasing or ratio-reducing gear stage from the transmission system. By eliminating this intermediate gear stage, the source of vibration excitation and mass inertia is extracted from the system, allowing direct connection between the drive shaft and work rolls, thereby improving dynamic behavior and reducing vibrations while maintaining torque transmission capability
Solution Approach 2:
The transmission system is segmented into two independent pinion stages, each directly connected to its respective work roll. This segmentation eliminates the need for a single intermediate gear stage, allowing each pinion to be optimally sized and positioned to minimize vibrations while maintaining independent control over each roll's rotation
2Device complexity
If gear ratio of one is used in shifting stages, then simplicity is achieved, but vibration excitation is exacerbated at high speeds
Solution Approach 1:
The patent implements a shiftable transmission system with two independent pinion stages that can be dynamically switched between different gear ratios. This allows the system to adapt its gear ratio based on operating conditions, enabling high-speed operation with reduced vibrations while maintaining the ability to use simpler gear ratio configurations when appropriate
3Power
If larger mass inertia of transmission gears is used, then torque transmission capability is improved, but dynamic behavior and speed control optimization are adversely influenced
Solution Approach 1:
The patent extracts the intermediate gear stage that contributes excessive mass inertia from the transmission system. By removing this heavy gear component and replacing it with direct pinion connections to the work rolls, the system achieves adequate torque transmission capability with significantly reduced mass inertia, thereby improving speed control optimization and dynamic response
Data Source
AI summary
The invention relates to a shiftable transmission (1) having at least two shifting levels, preferably for use in rolling mill technology, said shiftable transmission comprising: a rotatably mounted input shaft (20), to which an input torque an be applied; a rotatably mounted first output shaft (30) and a rotatably mounted second output shaft (40), which are arranged parallel and are connected to each other by means of an output transmission stage in such a way that aid output shafts rotate oppositely, preferably at the same rotational speed, when an input torque is applied to the input shaft (20) at any shifting level of the shiftable transmission (1); a first coupling (50), which is designed to selectively connect an disconnect the input shaft (20) and the first output shaft (30), a first shifting level of the shiftable transmission (1) being realized in the coupled state, in which first shifting level the input shaft (20) and the first output shaft (30) are connected to each other in such a way that the input torque is transferred from the input shaft (20) to the first output shaft (30) without step-up or step-down, preferably without redirection and without a spur gear stage.