a vibration isolator

Abstract

The invention belongs to the technical field of automobiles and discloses a vibration isolator. The vibration isolator includes a bottom plate; a friction component, which is arranged on the bottom plate; a casing, the bottom of the casing is slidably arranged in the friction component and can be pressed against the friction component; a first reset member, which is arranged inside the casing, and the second The two ends of a reset member are respectively abutted against the inner wall and the bottom plate of the casing; the second reset member is arranged in the first reset member and arranged in parallel with it, and the two ends of the second reset member selectively abut respectively On the inner wall and bottom plate of the casing. When the vibration isolator is under high-frequency and small load, the first reset member provides the stiffness required for vibration reduction, and the small friction force between the friction component and the casing provides damping. At this time, the stiffness and damping are small, which is beneficial to high-frequency Vibration reduction; when encountering impact or heavy load conditions, the two-stage reset parts work at the same time to improve the rigidity of the system, and the cover can be pressed against the friction components to increase frictional damping and meet the requirements of large stiffness and large damping at low frequencies Isolation Shock Requirements.

Description

technical field [0001] The invention relates to the technical field of automobiles, in particular to a vibration isolator. Background technique [0002] At present, the vehicle powertrain mounts are mainly rubber mounts, which are mainly used for high-frequency vibration isolation. According to the characteristics of the rubber structure itself, at the beginning of the design, the stiffness and damping of the rubber material can only be designed with a large value or a small value at the same time. The dynamic stiffness and damping lag angle of the existing rubber isolator vary linearly with the frequency, and the change is very small, which makes it difficult for the dynamic stiffness and damping characteristics of the rubber mount to meet the requirements of broadband isolation and noise reduction under various engine operating conditions. requirements. [0003] In order to prevent the powertrain from generating a large displacement when the car is braking, turning or dr...

AI Technical Summary

Problems solved by technology

If you choose a mount with smaller stiffness and damping, the smaller the stiffness, the higher the ratio of the excitation frequency to the natural frequency, and the smaller the damping, it is good for vibration isolation and can reduce high-frequency vibration noise. Damping is not conducive to preventing shocks and cannot effectively suppress low-frequency large-amplitude vibrations

[0004] The existing adjustable stiffness suspension structure has only one spring, and the stiffness can be adjusted during the initial installation. Once the installation is completed, the stiffness cannot be changed according to the actual operating conditions, and the stiffness must be adjusted manually. Currently, the damping cannot be adjusted.

Therefore, the rubber mount cannot simultaneously meet the requirements of the powertrain for high stiffness and large damping at low frequencies and low stiffness and small damping at high frequencies.

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