Camshaft
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图 1 | g01277351 |
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)
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图 2 | g01277354 |
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。
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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)
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图 3 | g00629702 |
(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:
- 测量凸轮轴凸尖高度 (6) 。
- 测量基圆 (7) 。
- 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)
Caterpillar Information System:
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