車輛工程驅(qū)動橋設(shè)計翻譯-閱讀頁
2025-06-05 15:54本頁面
【正文】 ential, uses cone clutches under coil spring pressure. A crosssectional view is pictured in 9 Drive Axle Assembiles The Oldsmobile AntiSpin differential, uses the pressure of the coil springs to force the clutch cones into tight engagement with the case. This action tends to lock the axles to the case. In order for differential action to occur, the cones must be forced to slip. If one wheel slips, the other will still receive some driving force via the cone. The PositiveTraction differential in functions in a similar manner. Another positraction differential is illustrated i. Construction is similar to that in Figs1619 and 1620 except disc clutches are employed instead of cone clutch. HYPOID GEARING To facilitate lowering the propeller shaft tunnel in the floor of the car, and to allow lowering the body of the car, many ring gear pinion gears enter and drive the ring gear somewhat below the centerline of the axles. This gearing setup, using a modified spiral bevel gear, is referred to as HYPOID gearing. A special hypoid lubricant is necessary to prevent premature wear due to the sliding, wiping action that takes place between the ring and pinion gear teeth. Study the construction used in the pinion shaft assembly. Take note of the two tapered roller bearings used to support the shaft. This type of bearing withstands both radial (forces working at right angles to the shaft) and longitudinal (lengthwise) thrust. SPIRAL BEVEL GEARING Another type of ring and pinion gearing uses the spiral bevel gear. This type of pinion gear meshes with the ring gear at the axle centerline. The spiral tooth shape allows an overlapping tooth contact that makes for quiet operation, as well as added strength. Before one tooth rolls out of contact with another, a new tooth contact is made. This distributes the torque load over several teeth. The cross section, shows the path of the churning lubricant (see arrows). Notice how it is thrown up and forward where it drops down and flows back, lubricating the ring gear and pinion gear, pinion bearings, etc. SPUR BEVEL More antiquated, as far as differential gearing is concerned, is the spur bevel. Auto Mechanics Fundamentals RING AND PINION The tooth contact position, as well as clearance and back lash (distance one gear will move back and forth Without moving the other gear), is of critical importance. Ring and pinions are always matched, and must be installed as a pair. NEVER REPLACE ONE 10 WITHOUT THE OTHER. illustrates tooth clearance, backlash, as well as other gear tooth nomenclature. Correct and incorrect ring and pinion tooth contact patterns are shown in Fig. 1628. The correct contact pattern is very important for strength, wear, and quiet operation. These patterns are brought out by coating the teeth (after cleaning) with Prussian blue or white lead pound. The gears are revolved in both directions, and contact pattern bees visible. The drive side is side that contacts when the pinion is driving the ring. The coast pattern is when the ring is driving the pinion.
畢業(yè)設(shè)計相關(guān)推薦
鄂ICP備17016276號-1