Combined damping device for vibration reduction and noise reduction of gear shaft system

Abstract

The invention relates to a composite damping device for vibration and noise reduction of gear shafting, which belongs to the technical field of damping devices. The composite damping device acts on each gear shaft through an auxiliary bearing, a clamp and a vibration transmission frame with a flexible structure, vibration, which is generated by some factors in a process of transmission, of a gear pair is transferred to the auxiliary bearing, and the clamp and the vibration transmission frame so as to drive a piston soaked in high-viscosity damping liquid to do shearing motion in the damping liquid, generate a damping force large enough and absorb and dissipate vibration energy, thereby suppressing bending vibration of the shaft. On one hand, internal excitation of the whole gear is reduced, on the other hand, vibration which is transferred to a gearbox body is attenuated. By virtue of the composite damping device disclosed by the invention, the vibration of frequency components due to meshing impact in the gear shafting can be simultaneously reduced, and a vibration frequency band is wide. The composite damping device has the advantages of simple structure, easiness in removal and installation, flexibility of installation position, no worn parts, long service life and the like.

Description

technical field [0001] The invention mainly relates to a vibration reduction and noise reduction combined damping device installed in a gear shaft-to-gear transmission system, which can be used for vibration reduction and noise reduction of gear transmissions in the fields of wind power generators, aviation generators, steam turbines and other fields, and belongs to the technical field of damping devices . [0002] technical background [0003] As a general device for transmitting motion and power in mechanical equipment, gears and gearboxes play an important role in modern large-scale equipment such as metal cutting machine tools, aviation, power systems, transportation machinery, and metallurgical machinery. However, due to its complex structure and harsh working environment, when the gears are engaged in transmission, due to the influence of factors such as changes in external loads, gear processing and installation errors, time-varying gear meshing stiffness, and collisio...

AI Technical Summary

Problems solved by technology

In the above damping measures, the damping ring and the damping plug can effectively suppress the resonance caused by some harmonics in the gear meshing function through the friction between the gear and the gear, but the damping effect of the damping ring and the damping plug can only be limited. Due to the low natural frequency components of gears, broadband vibration reduction cannot be achieved

The viscoelastic damping layer can achieve vibration reduction in a certain frequency band, but the energy dissipation effect of the viscoelastic material has a great relationship with the thickness of the damping layer. Only when the damping layer reaches a certain thickness can the viscoelastic material control the gear vibration better. For some gears with high precision requirements or limited weight, it is not allowed to add too much additional mass

In the active control technology of gears, Zhang Feng from Chongqing University in China worked on "Active Vibration Control and Algorithm Research of Gear Transmission System Based on Piezoelectric Actuators" (Chongqing University Doctoral Dissertation 2013) and many foreign scholars, such as Yuan In "Experimental study on active vibration control of a gearboxsystem" (Journal of Sound and Vibration 282(2005) 713–733) by H.Guan, a piezoelectric actuator is used on a certain gear shaft to control the actuator through different algorithms to achieve alignment. Vibration and noise reduction of gearboxes, but this algorithm is complex, and it is only effective for vibrations at the basic meshing frequency, and it still cannot achieve broadband vibration reduction

Chinese patent CN101133228B discloses a vibration damping device for the output shaft of the gear box of a rock drilling rig. The friction element on the brake is used to achieve the purpose of vibration damping, but it can only be applied to the gear box of a rock drilling rig, and the application range is limited.

The above measures are to reduce vibration on the wheel body and gear shaft, while Chinese patents CN101725482A, CN101363419A, CN101333998A and German patent DE29924608UI have invented a gear box vibration-damping support for vibration isolation. This measure can only isolate gear vibration and noise transmission. to other parts of the unit, but the vibration on the gear shaft has not been effectively damped

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