Method for calculating fatigue life of belt type CVT steel belt ring under high rotating speed condition

Abstract

The invention relates to a method for calculating the fatigue life of a belt type CVT steel belt ring under a high rotating speed condition. The method comprises the following steps: carrying out belt type CVT transient dynamic analysis; obtaining a load spectrum of the infinitesimal section of the steel belt ring running for one circle by using an equivalent method, and then calculating the fatigue life of the belt ring under the specified condition; respectively considering two types of conditions of rotating speed, torque change and speed ratio change under a fixed speed ratio, and obtaining a theoretical life image of the CVT belt ring by using a life calculation method which is the same as the previous two steps and combining a data interpolation method; the method comprises the following steps: firstly, obtaining probability distribution obeyed by a general working condition speed ratio, an input torque and an input rotating speed by using a statistical method; calculating the life of a belt ring at a constant speed ratio by considering the probability of a CVT theoretical life image and an input condition; and finally, obtaining the actual service life of the belt ring under general working conditions by using the service life of the belt ring with different speed ratios and the probability distribution obeyed by the speed ratios. The method for calculating the fatigue life of the steel belt ring is provided from the theoretical angle, and the fatigue life of the steel belt ring can be accurately estimated.

Description

technical field [0001] The invention relates to the technical research field of a metal belt type CVT under the condition of high rotational speed, in particular to a method for calculating the fatigue life of a metal steel belt ring under the condition of high rotational speed. Background technique [0002] With the continuous development of society, automobiles have become an indispensable means of transportation for people to travel, but with it comes the thorny problem of increasingly serious environmental pollution caused by a large number of automobile exhausts. All countries in the world attach great importance to environmental issues. Electric vehicles use batteries as a power source and are an emission-free means of transportation. As the country continues to strictly control the parameters of vehicle emission indicators, electric vehicles are expected to replace traditional vehicles and become the main means of travel for people in the future. Studies have shown t...

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Problems solved by technology

[0003] However, experiments have shown that the reliability of CVT will be greatly reduced under high speed conditions, and the outermost steel belt ring of the metal steel belt is very easy to break, resulting in CVT failure. The failure time is much earlier than normal damage, and it is very likely that the belt ring due to fatigue failure

However, due to the specific experimental conditions and the special structure of the CVT, it is impossible to obtain the actual load on the belt ring at high speed through the experiment, and the entire ring of the CVT steel belt ring is subjected to load, and the number of loads at the same time numerous

Due to the continuous rotation of the belt ring, the position of the load application point is also constantly changing, which makes it difficult to calculate the fatigue life of the belt ring

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