3126B Engine for Caterpillar Built Machines Caterpillar


Camshaft

Usage:

120H 124



图 1g01115468

(1) 新止推垫圈的厚度 ... 4.70 ± 0.03 mm (0.185 ± 0.001 in)

新曲轴的轴向间隙 ... 0.13 ± 0.08 mm (0.005 ± 0.003 in)

磨损凸轮轴的最大允许轴向间隙 ... 0.46 mm (0.018 in)

(2) 凸轮轴轴颈的直径 ... 65.126 ± 0.013 mm (2.5640 ± 0.0005 in)

(3) 进气凸轮

(4) 排气凸轮

(5) 凸轮轴台肩与齿轮台肩间的距离

总距离 ... 4.83 ± 0.05 mm (0.190 ± 0.002 in)




图 2g00939444

(6) 凸轮轴凸轮升程

规定的凸轮轴凸轮升程 (6)

排气凸轮 ... 7.707 mm (0.3034 in)
进气凸轮 ... 7.970 mm (0.3138 in)

利用以下程序确定凸轮升程:

  1. 测量凸轮轴凸轮高度 (7) 。

  1. 测量基圆 (8) 。

  1. 将步骤 2 中得到的基圆数值从步骤 1 中得到的凸轮高度中减去。 二者之差就是实际凸轮轴凸轮升程 (6) 。

新凸轮的实际凸轮高度和规定凸轮高度的最大可允许差值 ... ± 0.10 mm (0.004 in)

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