Design And Analysis On Powertrain’s Rubber Mounts System Of UTV

Having a strong driving force and a continuously variable transmission, off-roadvehicles UTV is applicable to all kinds of complicated road, thus UTV has broad marketprospects, and the development of the car has great economic value. The layout of themounting system and the rubber mount component structural design is directly relatedto engine vibration transfer to the frame, and influence vehicle NVH performance.Because of the good isolation effect, the great damping, the simple manufacture process,low cost, easy maintenance etc., Rubber mount is still the most widely used vehiclesuspension components. At the same time, strong nonlinear static and dynamiccharacteristics of the rubber material, lead the design and simulation of rubber mount toa certain degree of difficulty. Therefore, the layout of the UTV powertrain rubbermounting system and rubber mount components structural design has become one of thekey technologies for the development of UTV off-road vehicles.In this paper, the design of powertrain rubber mounting system and dynamic simulationmethods is analyzed and researched, and the main tasks are as follows:1) Obtained the relevant parameters of the powertrain mounting system, andestablished the torque-axis coordinate system of the powertrain mounting system, tofacilitate the establishment of hanging in the Matlab program set system free vibrationdifferential equations, some assumptions and simplifications of the rubber mountingsystem were made;2) determined the arrangement of the rubber mount and the installation locationsof the rubber mounts according to the relevant decoupling theory, based on theexcitation conditions of the powertrain mounting system, configured the naturalfrequencies distribution interval (5～13.26Hz) of the mounting system, and obtained athe static stiffness value of the three rubber mounts, and designed the rubber mountstructure according to the static stiffness, the decouple degrees of the mounting systemat Z and Ry directions are higher than98%;3) calculated the engine excitations of the full engine speed conditions,established the finite element bench model of the rubber mounting system, analyzed theinfluence of excitation frequencies, excitation amplitude and preload to the dynamicstiffness of the rubber mount using its finite element model, calculated the dynamicstiffness curve of the rubber mount in the actual work, using optimal algorithm to fit a rubber mount dynamic stiffness curve, established the multi-body Maxwell model ofrubber mounts and the rubber mounting system multi-body bench model, and verifiedthe multi-body rubber mounting system model by using the result of finite elementmodel.4) on the basis of the bench model, established a flexible body, the suspensionsystem and tire-road model, thus established the vehicle model of the mounting system,similarly use the calculation results of the vehicle mounting system finite elementmodel to demonstrate the rationality of the vehicle mounting system multi-body model,vibration acceleration transfer rate curves of the three rubber mounts were calculated,and the results suggested that vibration acceleration transfer rates are below0.4, themounting system meet the requirements of vibration isolation.