Optimal Design Method of Tie Rods for Heavy Vehicles

Abstract

The present invention proposes an optimal design method for tie rods of heavy-duty vehicles: step S1: obtain the steering load data of both-side wheels in real time; step S2: calculate and obtain the working range of the steering load of both-side wheels; Based on the extreme working conditions of the actual vehicle, obtain the load working range of all working conditions; step S4: calculate the stress range of the tie rod according to the working range of the full working condition and the mathematical model of the steering system including the tie rod; step S5: according to the The mathematical model of the steering system of the tie rod, confirm the influence range of the pump source pressure and the steering load on the tension and compression range of the tie rod; Step S6: Confirm the critical point where the tie rod alternates tension and pressure; Step S7: Based on the tie rod’s large-scale tension , the actual force range under small-scale compression, select the safety factor of the tie rod; step S8: according to the safety factor of the tie rod and the force range, optimize the design of the tie rod. It can optimize the design of 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 optimization 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 (such as large-tonnage all-terrain cranes, large beam trucks and mining dump trucks and other civil equipment) due to their strong passability, high stability, and large bearing capacity. 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 part of the vehicle steering transmission mechanism, 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 driving of the car, and it ...

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.

Images