Optimal design method for heavy vehicle tie rod

Abstract

The invention provides an optimization design method for a heavy vehicle tie rod. The method comprises the steps of S1, obtaining the double-side wheel steering load data in real time; S2, calculating to obtain a double-side wheel steering load working interval; S3, adjusting the steering load to enable the steering load to tend to the limit working condition of the real vehicle driving, and obtaining a full-working-condition load working interval; S4, according to the all-working-condition load working interval and the steering system mathematical model containing the tie rod, solving the tie rod stress interval reversely; S5, according to the steering system mathematical model containing the tie rod, confirming the range of influence of a pump source pressure and the steering load on the tension and compression range of the tie rod; S6, confirming the critical point of tension-compression alternation of the tie rod; S7, selecting the safety coefficient of the tie rod based on the actual stress interval of large-range tension and small-range compression of the tie rod; and S8, carrying out optimization design on the tie rod according to the safety coefficient and the stress interval of the tie rod, so that the optimization design can be carried out on the tie rod more accurately.

Description

technical field [0001] The invention relates to the fields of vehicle engineering and automobile steering devices, in particular to an optimal design method of a tie rod of a heavy vehicle. Background technique [0002] Heavy-duty multi-axle vehicles have been widely used in infrastructure construction due to their strong passability, high stability, and large carrying capacity (such as large-tonnage all-terrain cranes, large-scale beam transport vehicles, and mining dump trucks and other civilian equipment) and military heavy industry. The complex and changeable road environment puts forward higher requirements for the steering performance of heavy-duty multi-axle vehicles. As a part of the steering transmission mechanism of the vehicle, the tie rod is directly related to the steering situation of the vehicle, and plays a role in transmitting motion and power in the steering mechanism. important role. The tie rod is one of the important security parts to ensure the safe d...

AI Technical Summary

Problems solved by technology

The existing force checking design method of tie rods for heavy-duty multi-axle vehicles does not consider the influence of parameters of the hydraulic system in the electro-hydraulic steering system, such as pump source pressure, on the mechanical properties of tie rods, and uses the equal tensile and compressive strength design check method , because the tie rod is a slender member, under the same tension and compression strength standard, it is difficult to meet the stability strength requirement of the compression rod by the optimal design method that can meet the tensile stress strength requirement

Therefore, the optimal design method of checking the tensile and compressive strength of the tie rods will make the design process cumbersome, the safety margin will be too large, and the optimal design considering the steering conditions will not be realized, and the optimal design level of the tie rods will not be high.

[0007] 2) For multi-axle vehicles, the customized design of the tie rods of each axle cannot be effectively carried out

However, due to the different steering modes of each axle of a multi-axle vehicle, the steering load of each axle is also different, which will make the tie rods of each axle have unique mechanical characteristics, and the actual required strength standards of each tie rod will be different.

Therefore, the above-mentioned design method cannot effectively carry out customized design for each axle tie rod of a multi-axle vehicle

[0008] 3) The existing method of obtaining foundation load data sources has limited improvement in the optimization effect of tie rod optimization design

The base load data source obtained based on the steering load calculation method can improve the effect of the optimal design of the tie rod, but the existing steering load calculation method is mainly combined with the road surface grade information, and does not take into account the actual electro-hydraulic power steering system. The dynamic characteristics of the steering load cannot obtain data close to the real steering load, it is only estimated data, and the accuracy is not high

Therefore, in the optimal design of the tie rods, the mechanical properties of the tie rods cannot be accurately analyzed through the basic load data, which makes the optimization effect of the subsequent optimal design of the tie rods limited.

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