3054E Industrial Engine Caterpillar


Camshaft

Usage:

3054E 304



图 1g01277351

检查凸轮轴轴向间隙

(1) 新凸轮轴的轴向间隙 ... 0.10 至 0.55 mm (0.004 至 0.022 in)

磨损凸轮轴的最大允许轴向间隙 ... 0.60 mm (0.023 in)




图 2g01277354

典型凸轮轴

(2) 螺栓

将螺栓拧紧至下述扭矩。 ... 95 N·m (70 lb ft)

(3) 凸轮轴止推垫圈

止推垫圈的厚度 ... 5.49 至 5.54 mm (0.216 至 0.218 in)
缸体上为止推垫圈预留的凹座的深度 ... 5.54 至 5.64 mm (0.218 至 0.222 in)
止推垫圈在缸体前表面的公差 ... −0.154 至 −0.003 mm (−0.0006 至 −0.0001 in)

(4) 下表给出了凸轮轴轴颈的直径。

表 1
凸轮轴轴颈的直径    
凸轮轴轴颈     标准直径    
1    
50.71 至 50.74 mm (1.9965 至 1.9975 in)    
2    
50.46 至 50.48 mm (1.9865 至 1.9875 in)    
3    
49.95 至 49.98 mm (1.9665 至 1.9675 in)    

凸轮轴轴颈的最大磨损量 ... 0.05 mm (0.0021 in)




图 3g00629702

(5) 凸轮轴凸轮升程

自然吸气式
进气凸轮 ... 7.382 至 7.482 mm (0.2906 至 0.2946 in)
排气凸轮 ... 7.404 至 7.504 mm (0.2914 至 0.2954 in)
涡轮增压式
进气凸轮 ... 7.031 至 7.130 mm (0.2768 至 0.2807 in)
排气凸轮 ... 7.963 至 8.063 mm (0.3135 至 0.3174 in)

(6) 凸轮轴凸尖高度

(7) 基圆

利用以下程序确定凸轮升程:

  1. 测量凸轮轴凸尖高度 (6) 。

  1. 测量基圆 (7) 。

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

新凸轮轴的实际凸轮升程和规定凸轮升程的最大允许间隙 ... 0.05 mm (0.021 in)

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