A Dynamic Vibration Absorber with Stepless Frequency Adjustment

Abstract

The invention discloses a dynamic shock absorber with stepless adjustable frequency, which includes a mass block and a spring. The shape is corresponding to the threaded groove that is interference fit with the surface of the spring; the mass block includes a plurality of mass blocks that can be coaxially fixed to each other as a whole; the mass block and the adjustment sleeve are respectively provided with adjustable A fixed structure that fixes the two to each other. The dynamic vibration absorber designed by the invention realizes the stepless adjustment of the natural frequency and covers all frequency values ​​within a certain range. At the same time, both the increase and decrease of the mass block and the adjustment of the stressed length of the spring are very convenient, which effectively solves the problems of difficulty in on-site debugging and low precision.

Description

technical field [0001] The invention relates to the technical field of automobile dynamic vibration absorbers, in particular to a dynamic vibration absorber with steplessly adjustable frequency. Background technique [0002] The dynamic vibration absorber is a means to effectively control the vibration of the car. Its principle is to convert a certain mode of the original vibration main system into two close modes by adding a vibration subsystem, and the original mode frequency The vibration energy is transferred to the additional vibration subsystem, so as to realize the vibration amplitude control of the main vibration system. Usually the dynamic vibration absorber is composed of an additional mass block and a spring damping unit, and for the vibration absorption in the rotation direction, it is a combination of a rotating inertia block and a torsion spring. [0003] Without considering the damping effect, adjust the mass and stiffness of the dynamic vibration absorber so...

AI Technical Summary

Problems solved by technology

For example, the invention patent application CN201110075488.0 and the utility model CN201720304668.4 use the superimposition of multiple mass blocks and rubber springs to realize stepwise adjustable frequency, but each adjustment changes the mass ratio of the dynamic vibration absorber, which violates the dynamic General Design Principles for Vibration Absorbers

Invention patent application CN201811257162.8 The stiffness can be adjusted by changing the number of rubber blocks or replacing rubber blocks with different hardness. This is also a stepwise adjustable, and the stiffness is affected by the non-uniformity of the rubber stiffness, and the unpredictable error is larger

However, the local stress generated by the compression method of the clamp and the rubber column and the non-uniformity of the rubber material affect the linearity of the stiffness of the rubber column, and the fixing of the clamp depends on the friction of the side wall of the rubber column, which has poor reliability.

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