Dynamic vibration absorber with adjustable damping

Abstract

The invention discloses a dynamic vibration absorber with adjustable damping. The dynamic vibration absorber comprises a box, a box cover, a piston and a piston rod; a liquid medium is injected to a cylinder, one end, away from the piston, of the piston rod penetrates the central hole of the box cover to be fixedly connected with a mass block, the rod end and the non-rod end of the piston are respectively and fixedly provided with an upper coil spring and a lower coil spring which are connected with inner walls of two ends of the cylinder, an upper damping connection plate and a lower dampingconnection plate which are in sliding fit with the inner wall of the box are respectively and coaxially arranged between the rod end of the piston and the upper coil spring as well as the non-rod endand the lower coil spring, the upper damping connection plate, the lower damping connection plate and the piston are evenly provided with a plurality of damping holes along the same diameter circumferentially, and the upper damping connection plate, the lower damping connection plate and the piston can rotate relatively around the axis. By the arrangement, large damping can be prevented, good vibration absorption effect is achieved, damping and natural frequency are adjustable, and the dynamic vibration absorber is simple and compact in structure and convenient to disassemble.

Description

technical field [0001] The invention relates to a shock absorber, in particular to a dynamic shock absorber with adjustable damping. Background technique [0002] Vibration will generate noise, and harmful vibration will cause premature damage to products and structures, reduce service life, and even endanger people's health and safety. At present, the NVH performance of passenger cars has attracted more and more attention, and the dynamic dynamic Frame, drive shaft, transmission shaft and exhaust pipe, etc. [0003] The dynamic vibration absorber belongs to the single-degree-of-freedom vibration-absorbing system. It is a device that uses the resonance system to absorb the vibration energy of the object to reduce the vibration of the object. After the dynamic vibration absorber is added, the main system generates two resonances near its natural frequency. peak, the vibration-absorbing frequency band is very narrow, and when the external frequency changes, its vibration-red...

AI Technical Summary

Problems solved by technology

[0004] At present, the common vibration absorber is composed of rubber and mass block. The rubber can provide a certain structural damping, but the damping is still relatively small. For the same vibration absorber structure, the damping ratio is fixed, so it cannot be well satisfied. different needs of people

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