四档变速箱的轴承有25%的时间受载。
On a four-speed box the bearings are under load 25% of the time.
一般情况下只能承受径向负荷，只有内外圈均带档边单列轴承可以承受较小的常定轴向负荷。
Normally these bearings can accommodate radial load only, none but single row bearings with ribs both on inner and outer rings can carry partial lighter axial load.
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