Dynamic vibration absorber with stepless adjustable frequency

Abstract

The invention discloses a dynamic vibration absorber with stepless adjustable frequency. The dynamic vibration absorber with stepless adjustable frequency comprises a mass block and a spring. The dynamic vibration absorber with stepless adjustable frequency is characterized in that two ends of the spring are respectively connected with adjusting sleeves, and threaded grooves corresponding to the shape of the spring and in interference fit with the surface of the spring are formed in the adjusting sleeves; the mass block comprises a plurality of mass partitioning blocks which can be coaxially fixed into a whole; and the mass partitioning blocks and the adjusting sleeves are respectively provided with a fixed structure capable of fixing the mass partitioning blocks and the adjusting sleeves.The designed dynamic vibration absorber realizes the stepless adjustment of natural frequency and covers all frequency values within a certain range. Meanwhile, whether the mass block is increased ordecreased or the spring stressed length is adjusted conveniently, and the problems of difficulty in on-site debugging and low precision are effectively solved.

Description

technical field [0001] The invention relates to the technical field of automotive dynamic vibration absorbers, in particular to a dynamic vibration absorber with a stepless frequency adjustable. Background technique [0002] The dynamic vibration absorber is an effective means of controlling the vibration of the vehicle. Its principle is to convert a certain mode of the original vibration main system into two close modes by adding a vibration subsystem. 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 the vibration absorption in the rotation direction is a combination of a rotational inertia block and a torsion spring. [0003] Without considering the damping effect, adjust the quality and stiffness of the dynamic vibration absorber so that its natural frequency...

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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