基准齿轮

cam gear───n.凸轮装置，[机]凸轮传动装置

bottom gear───头挡；头档

datum level───基准面；基准平面；高程基淮

datum plane───n.[测]基准面

back gear───后倒齿轮；慢盘齿轮；[机]背齿轮

datum line───[测]基准线

draw gear───牵引装置；[车辆]车钩

Gearboxes shall be taken as the standard unit. To adjust bottom base by referring to horizontal subdivision section of gear box, box body processing datum plane or support of bottom base;───compressors 齿轮箱为基准机，进行底座调整时以齿轮箱水平剖分面、箱体机加工基准面或 底座支承为基准，同时兼顾压缩机和电动机侧水平仪。