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正时齿轮的曲轴键槽中心线对于连杆轴颈中心线的偏移量,是影响配气相的主要项目,在制造、修理内燃机时,从工艺装备、合理的工艺过程、正确的操作等方面,都要确保该项误差不得超越允许范围。目前通用的检具是顶针平台,附加一个分度头,操作繁杂,对大批量生产,如工艺稳定,采用抽验尚能满足需要。对于批量不大、工艺不稳以及修理单位,采用上述方法就难于应付,更不能拿它来进行工序鉴定。
The deviation of the centerline of the crankshaft keyway of the timing gear to the centerline of the connecting rod journal is the main item that affects the gas phase. When manufacturing and repairing the internal combustion engine, from the aspects of process equipment, reasonable process, correct operation, etc., Make sure that the error does not exceed the allowable range. At present, the common gage is the thimble platform, an additional indexing head, complicated operation, for mass production, such as process stability, the use of sampling can still meet the needs. For small quantities, process instability and repair units, using the above method is difficult to cope with, but can not take it to the process identification.