william 發問時間: 社會與文化語言 · 9 年前


since greater amounts than this tend to give diminishing

returns in reducing steering effort, as well as exaggerating the

effects of road shocks felt at the steering wheel.

the advantage claimed for negative , as opposed to positive,

steering offset is that tyre drag forces acting about the moment arm created

by the offset promote toe-in, rather than toe-out, of the wheels .

Therefore in the event of the tyre deflation or uneven braking,the wheel turning-in

effect of negative offset tend to counteract any veering off course of the vehicle.

This feature is also relevant to modern diagonal split dual-circuit safety braking

systems, since if either circuit misbehaves one front brake will develop much more

drag force than the other.

Centre point steering is obtained when the swivel axis of the wheel intersects ground level

at the centre of the tyre footprint area, instead of being laterally offset from it

as in conventional practice . True centre point steering implies a vertical swivel axis

that is contained within the centre plane of the wheel, but this has seldom been

found practicable except in the case of some earlier front- wheel-drive cars

with brakes mounted inboard on the final drive unit. Otherwise,

an apparent centre point steering geometry is obtained by resorting to

a fairly generous swivel axis inclination, usually in the region of 10度 or more,

An important advantage of centre point steering is that in the presence of braking forces

and also traction forces in the case of driven front wheels, acting through the centre

of the tyre footprint area, the wheels experience no turning moment or disturbance about

their swivel axes. A disadvantage of centre point steering is,of course, the earlier

mentioned increased scrubbing effect on the tyres, which demands greater steering

effort during parking manoeuvres unless power- assisted steering is used.

1 個解答

  • 9 年前

    由於更多比這往往會給遞減返回在減少轉向的努力,以及誇大其辭路衝擊影響的感覺在方向盤。為負,積極進取,相對於聲稱的優勢轉向偏移量是該輪胎拖力有關創建的時刻臂偏移量的促進腳趾中而不是不是趾外,車輪。因此在輪胎通貨緊縮的發生或不均勻制動,車輪轉向中負偏移的影響往往以抵消任何偏離軌道車輛的轉向。此功能也是有關的現代對角拆分雙回路安全制動系統,因為如果任一電路存在問題一個前制動將開發更多拖動比其他的力量。中心點轉向輪旋轉軸相交地面時,即可獲得輪胎占地面積方面,而不是從它正在橫向偏移的中心按照常規的做法。真正的中心點轉向意味著垂直旋轉軸滾輪的中心平面內包含的但這已經很少發現在切實可行範圍內除在一些較早前全輪驅動車的情況下與刹車裝載最終傳動裝置上的推進。否則為通過訴諸獲得明顯的中心點轉向幾何通常在該地區的 10度或更多,相當慷慨的旋轉軸傾斜中心點轉向的重要優勢是在場的制動部隊和牽引驅動前輪,通過中心行事的情況下的力量也占地面積爾地區的車輪體會沒有車削的時刻或干擾他們的旋轉軸。中心點轉向的一個缺點是,當然是,越早提到增加洗滌效果對輪胎,要求更多的轉向用於在停車演習,除非電源-助力轉向努力。

    • 登入以對解答發表意見