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我们公司售出的潍坊-12型拖拉机中,除使用不当者外,在磨合期后的半年时间内,变速箱第三轴轴承损坏约占整车故障的1/2。故障现象表现为:轻者变速箱内有异响;重者第三轴左侧305轴承损坏,加载掉档;更重者,两侧轴承都损坏,轴承安装孔磨损,轴承走外圆。检查发现,故障多由305轴承安装孔过大所引起。那么,安装孔为什么会大呢?我们分析认为:
Weifang -12 tractors sold in our company, in addition to improper use, after the break-in period of six months, the third gearbox bearing damage accounted for about a vehicle fault 1/2. Fault phenomenon manifested as: the light transmission has abnormal sound; severe third shaft left 305 bearing damage, load off the file; heavier, both sides of the bearing are damaged, the bearing mounting hole wear, the bearing away from the outer circle. Inspection found that failure caused by the bearing hole 305 is too large. So, why the installation hole is big? Our analysis: