Motor vehicle steering wheel is impossible to design 1:1change direction compare, do not make even F1 racing car even; The steering wheel of F1 can control each to hit 90 degrees (the limit) , but the wheel turns to extent is short of 90 degrees; Can accomplish change direction than 1:1block Ding Che only; Discussing kind of design to be able to make car head much more acute first, come true very hard on rigid structure however, if the wheel turned,each can imagine condition of occurrence what of 90 degrees of meetings, two front-wheel drive began to come athwart, and transverse space is insufficient also (the friend that the imagination is less than a scene can see next pictures) !
This graph can show an issue very well actually, the car nowadays has all sorts of changing direction to help strength, the circle that so steering wheel can turn fast slant little, but also can control each to make circuit the least normally half above, steering wheel can turn circuit half, in the graph before can the wheel also turn circuit half? If did not come of the car change OK applying to universal annulus can realize roll several rounds probably, but the wheel that uses at present is impracticable, it wants to turn the circle is met give the seat of engine took up (analogy) , do not say to turn encircled, calculate front-wheel drive to want to turn 90 degrees are not done, from inside the graph we can see, the wheel turned at most 30 degrees do not arrive, and this had hit steering wheel the limit (by the smallest turn radius is knowable, right now steering wheel has hit the limit) ! 
If the description of above paragraphs still cannot arise to feel, so see this picture again, this is a car turn to a part, can see with naked eye from this piece of graph change direction annulus be to do not have method to accomplish rotational circuit above, the simplest say drive axis is in blocking it; So if want change direction than accomplishing 1:1, must assure steering wheel above all so turn to angle small, civil car wheel turns to angle most a few degrees 30, so steering wheel also is to be able to control each to hit 30 degrees or so closely, this ability accomplishs so called 1:1, pursue as follows even if turn to compared specification; So called change direction than be 1:1, it is steering wheel roll how many degrees, the wheel turns how much is spent, only those who block Ding Che change direction than can be being accomplished 1, because of it self-prossessed lighter, the racing bicycle that connect F1 is not done, at present of F1 racing bicycle change direction comparing is debugged temporarily according to actual circuit, but normally in 8:1, 9:1, 10:1Between, separate much curvedder circuit (look like Monaco? ) meeting attune teachs 6:1! 
Block Ding Che change direction than can be being accomplished one, because the weight of its oneself is very light,be, so even if is 1:1change direction than, did not aid what we also make force to move; And because its are self-prossessed very light, so road surface is passed on hair to dish the force that go up we also bear so that live, and if be done on our civil car for of 1 change direction than, even if support helps strength we can move easily direction, but the road surface when hefting 1.5 tons car on average to turn returns those who return steering wheel to pass on force big unusual; This passes on force to meet desperately loot direction, be over too speed is faster, this passes on force bigger, civil nowadays car changes direction than be in 10:1, even above, a lot of friends still are disrelished grab direction, hatchet man, if change direction to become bloodcurdling 1:1 than the design, so when turning pass on force to be able to make you direct steering wheel get off one's hands, after all family expenses car is not calorie of Ding Che, such passing on strength is not us can susceptive; Another is nodded even if compare accomplished 1:1, thinking you want light putt to use defense line only dish, car head can change substantially to, such condition drives daily to you do not have any advantage; Want to experience 1:1change direction to block Ding Che than can going, leave a few times to be able to understand why our family expenses car changes direction to become 1:1 than cannot be being installed! 
