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THE DESIGN OF THE FRONT SUSPENSION AND STEERING SYSTEM OF THE

MINIATURE MOTORCAR TO CARRY PERSONS AND GOODS WITH 4 SEATS


ABSTRACT


In this graduation design, I am responsible for automobile's steering

system and the front suspension system design of the miniature

motorcar to carry persons and goods with 4 seats mainly..In weeks ,I

work hard to get the more useful information to do my work better.

With the helping of Mr Li and other teachers ,and observation on

vehicle in laboratory .I got a conclusion : the front independent

McPherson suspension is the best form for this automotive .
All focus on elastic part .Because elastic is the most important part

in them .And I have got some important data for my design work . If I

can¡¯t get those data ,I could not do my work in the following days .I

get many data ,but for front independent McPherson suspension the main

thing is about spring , such as spring rate ,middle diameter ,spring

wire diameter and so on .spring rate is the most important data for my

independent suspension ,it do many influence about suspension.
In the last I discussion shock absorber and anti-roll-bar a little,and

involve the basic of them and the important usefully in modern car¡¯s

suspension.
Because the motortcar we design is a kind of small output volume,

seeing that the gradual improvement of the road surface quality of our

country and effort of acting on the steering wheel are not very large,

so I choose the manual steering system.
Compared with others steering gear, though the negative efficiency of

the rack and pinion steering gear is high, but it have of simple

structure, compactness, shell adopt aluminum alloy or magnesium alloy

die casting, the weight of the rack and pinion steering system is much

smaller than others, transmission efficiency is up to more than 90%,

so in this design I choose the rack and pinion steering system.
Because the front overhang of the car is very short and the engine

occupied comparatively very big space, what is more, the minimum

transmission angle of the Ackerman steering has a very close relation

with installation distance of the steering gear, so I choose fit the

Ackerman steering in the back of the car conceding all those factor

above.

KEY WORDS : independent suspension,MacPherson£¬the manual steering

system, the rack and pinion steering gear























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