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【正文】 置以及它們之間的間隙具有重要作用?？ōh(huán)和小齒輪相配合，總是成對(duì)出現(xiàn)的。不能用其他的組件來(lái)替代。正確的配合很重要，可以提供足夠的動(dòng)力。 5 DRIVE AXLE ASSEMBLIES After studying this chapter, you will be able to: ■ Explain the construction of different types of drive axle assemblies. ■ List the parts of various drive axles. ■ Compare the differences between a rear wheel and front wheel drive axle assembly. ■ Describe the operating principles of drive axle assemblies. Drive axle assemblies have several important functions. They must hold the wheels on, keep them upright, allow them to be turned (in front, on fourwheel drive and frontwheel drive vehicles) and propel the wheels forward or backward. They must drive the wheels in such a manner that one can turn faster than the other, yet both must receive torque. Drive axle assemblies must absorb the driving force of the wheels, and transmit it to the frame through springs, control rods, etc. The axle assembly provides an anchorage for springs, supports the weight of the vehicle and forms the foundation upon which the wheel brakes are mounted. Obviously, the axle assemblies must be well constructed, using quality materials. HOUSING The axle housing is usually made of stamped steel parts welded together. Or, the center section of the housing may be made of cast steel. Two basic types have been used: the BANJO type housing (in wide use) and the SPLIT housing (little used) consisting of two or more pieces. AXLES Two steel axles are placed inside the housing. Their inner ends almost touch。 and, in some cases, they do touch. The outer ends protrude out of the housing and form a base upon which the wheels, hubs, etc. are attached. The inner ends are splined and are supported by the differential assembly. The outer ends are supported in roller or hall bearings. ATTACHING WHEEL HUBS Two methods are employed to securc the wheelhubs to the axle. One emthod employs a taper on the axle end。 tile other forms the axle end into a flange upon which the wheel is bolted. TYPES OF AXLES Live axles (axles that turn with the wheels) are of three basic types: fullfloating, threequarterfloating and semifloating. Most cars utilize the semi floating axle. Most 6 trucks have fullfloating axles. If tile axle breaks, tile wheel will not e off. Tile three types . DRIVING THE AXLES The real39。 wheels of a vehicle must turn at different speeds when rounding the slightest corner (outside wheel must roll farther). Therefore, it is necessary to employ a unit called a DIFFEREN FIAL to drive the axles so both axles receive power, yet they are free to turn at different speeds. THE DIFFERENTIAL A splined axle side gear is placed on tile innersplined end of each axle. 1he axle side gear is sup ported by the differential case. The side gear is free to turn ill the case. The differential case may be turned. It will revolve about the axle side gears. The differential pinion shaft will turn with the case, bur tile axle side gears will not be driven. By bolting a large ring gear to the differential case. and connecting it to a ring gear pinion gear and shaft, it will be possible to turn the case. The
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