Bushing for electric vehicle powertrain suspension and suspension system

Abstract

The invention discloses a bushing for electric vehicle powertrain suspension, which comprises a mandrel, an outer sleeve, and a rubber main spring connected between the mandrel and the outer sleeve, and the rubber main spring includes a plurality of The outer contours of the main body are arranged at intervals, at least one side of the main body is provided with an extension, and the end surface of the extension and the end surface of the main body form a stepped structure. The invention further discloses an electric vehicle power assembly suspension system comprising the bushing. The invention has the advantages of simple and compact structure, easy processing and manufacturing, low high-frequency dynamic stiffness and avoiding the risk of high-frequency noise.

Description

technical field [0001] The invention relates to an electric vehicle, in particular to a bushing and a suspension system for a power assembly suspension of an electric vehicle. Background technique [0002] Compared with traditional fuel vehicles, pure electric vehicles can quickly exceed 1000 Nm in a very short period of time. Due to the high speed, the excitation frequency of the motor to the suspension system can also reach several kilohertz. The existing bushings for powertrain mounts, whether they are rubber mount bushes or hydraulic mount bushes, are difficult to overcome the defect of high-frequency dynamic hardening. At higher frequencies, the dynamic stiffness of the mount will sharply Ascent, the vibration isolation capability of the suspension bushing drops sharply, or even loses the vibration isolation capability. With the gradual popularization of electric vehicles, the demand for high-frequency vibration isolation of electric vehicle motor powertrain is becomin...

AI Technical Summary

Problems solved by technology

In order to solve the problem of high-frequency vibration isolation, the current main technical routes are: 1) By adding a vibration-absorbing layer to the rubber main spring, the high-frequency dynamic stiffness of the bushing in the 800-3000Hz frequency band is significantly reduced, and the vibration isolation performance of the entire bushing is improved. , but there is a risk that the additional vibration-absorbing layer will bring high-frequency noise; 2) The short cantilever and light weight of the suspension structure in the suspension system can achieve the effect of high-mode suspension structure and not easy to resonate, so as to improve the overall performance of the vehicle. NVH performance, but not any suspension point of any suspension system, can provide convenient conditions to achieve the ideal suspension structure

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