后顷角是指从车身的侧面望去，大王销或主销（转向时，车轮围绕其进行转向运动的转向轴）与地面垂直线的夹角。
n. caster
misc. caster angle
前大王销后倾角会影响直线的稳定性，以及在不同跑道下的行路表现。
The caster angle of the front hubs effects the straight line stability of the car and the way it reacts to different track conditions.
PD C切削齿尺寸、后倾角和布齿密度是影响PD C钻头性能的重要设计参数。
PDC cutter size, back rake and density are very important design parameters affecting the performance of PDC bit.
进而通过主销横向、纵向偏移距以及主销内倾角和主销后倾角，计算出内倾拖距和后倾拖距。
Then through these two offsets, as well as kingpin inclination and caster, kingpin offset and caster trail can be calculated.
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