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陈光祖:概念车是掌控汽车自主研发的纲

——摘自搜狐网(http://auto.sohu.com)
  (搜狐汽车评论 陈光祖/文)

  热闹非凡的上海国际车展已落下帷幕,我们冷静的回味,这次车展上有一个重大特点,那就是和过去车展不同的地方,出现有一批本土化的概念车,引起了人们广泛关注。这说明,中国一些汽车企业已经意识到,实现汽车产业自主研发,不仅从半路出家的搞研发和设计,而要注重从产品设计的源头上,创立有自己主意的产品研发和品牌能力,这是十分可贵的。

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Cam Shaft
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The camshaft is driven by the crankshaft by one of three methods:

  • Gear drive
  • Sprockets and timing chain
  • Sprockets and timing belt



Camshaft parts. Courtesy of Ford Motor Corporation.
  • Check the camshaft for:
    • a plugged oil feed,
    • the correct cam lift or
    • any broken or severely worn areas.
  • Check each lobe and journal for:
    • scoring,
    • scuffing,
    • fractured surface,
    • pitting,
    • and signs of abnormal wear.



Steel camshaft and roller followers in good condition.



Badly burned and worn camshaft bearing bores.

Normal lobe wear is a pattern slightly off center with a wider wear pattern at the nose than at the heel. The off-center wear is a result of the slight taper of the lobe used in conjunction with the convex shape of the lifter to rotate the lifter.




Normal wear patterns are slightly off center on the lobe. Reprinted with the permission of Ford Motor Company.
  • If the wear pattern extends to the edges of the lobe, the lifter will not rotate.
  • If there is any scoring or galling, the camshaft will have to be replaced or reconditioned.

Premature lobe and lifter wear is generally caused by metal-to-metal contact between the cam lobe and lifter bottom due to inadequate lubrication. The nose will be worn from the cam lobes, and the lifter bottoms will be worn to a concave shape or may be worn completely away.

This type of failure usually begins within the first few minutes of operation. It is the result of insufficient lubrication.


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