贾新光车事评论：想起了纺织工业的压锭
——摘自搜狐网(http://auto.sohu.com)
整理过去的资料，发现了一些过去不大经意的文章，现在读来却似乎又蕴含一些新的启示，摘抄下来，供网友们参考，本想加一些什么话，却总觉得是蛇足，因为这些材料已经把问题说得一清二楚，于是我不再加自己的话，但是要指出以下的文字都是摘抄的，所以都指出了出处。
2001年08月24日国研网发表的国务院发展研究中心技经部研究员张承惠一篇文章指出：1994年3月，中国政府颁布了《90年代国家产业政策纲要》。从《纲要》出台后的实际情况看，产业政策并未对经济结构产生明显影响。其原因主要是重点支持的行业范围较大(占GDP的比重超过50%)，政府能够提供的支持能力却明显不足。同时政府缺乏推行产业政策的有效手段，各个部门和环节之间的协调相当困难。
针对这一问题，1998年中国政府选择了纺织、煤炭、建材、钢铁、汽车和石化6个结构性矛盾比较突出的工业行业，作为产业结构调整的工作重点。结构调整工作首先从纺织行业取得突破。鉴于生产能力过剩是该行业长期亏损的主要原因，中央政府制定了纺织行业压锭计划，要求在3年内压缩1000万纱锭，占原有生产能力的1／4。2000年，又要求纺织行业淘汰30万落后的毛纺锭。由于中央政府强有力的监控和鼓励政策具体到位，更由于纺织品市场长期不景气，企业无法继续维持，因而此项政策执行较好，压缩任务得以完成，整个纺织行业率先完成脱困任务。煤炭行业则兼并破产了一批资不抵债、扭亏无望的企业，关闭了一批资源枯竭的矿山，压缩产量2亿多吨，减少了亏损源。至2000年末，石油化工行业清理整顿小炼油厂的任务已基本完成，全国共取缔了6000座土炼油场点，列入名单的188户小炼油厂已关闭11...
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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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