rque wrenchProtective coverBush Circlip GMDEND fIs B4CV-7-C Bevel-helical gear reducers B4

Flender/Flender Gear Units/Bevel-helical gear reducers B4

the meshing between helical gears, more teeth are in contact, re- sulting in less load or more gradual load on the teeth. However, during meshing of helical gears compared with spur gears, there is more sliding and less rolling as the teeth make con- tact. Lubricants which minimize metal-to-metal contact and premature gear failure are re- quired. The sliding action of the contacting teeth generates thrust load along each gear shaft, requiring thrust bearings to maintain shaft alignment and to absorb the load on the shaft. Helical gears may be in the following configurations: single helical, double helical, her- ringbone, and internal. Double helical gears are set of helical gears, with tooth angles op- posed to each other and space between the opposing gears. This configuration allows the thrust generated by the angular contact of the teeth of one gear to be offset by the thrust mo- tion generated from the partner gear. Herringbone gears have tooth configuration similar to that of double helical gears with opposing helical teeth combined into -shaped teeth, usually meeting at 3-degree angle (fig. -. Internal gears Internal gears are cylindrical in form, but have either spur or helical teeth cut from the inte- rior of the gear. Internal gears are frequently found in split train drive arrangements. split drive arrangement divides the torque from single input, generally shaft with gear, into two or more paths through to the output. Epicyclic gear drives are space saving type of split train gear drive arrangement (fig. -. An epicyclic gear drive has smaller gears traveling around the internal circumference of an internal gear. Gears That Operate on Nonparallel, Intersecting Shafts Bevel gears are the principal type of gears that operate on nonparallel, intersecting shafts. Bevel gears have teeth cut on conical surface, and are constructed so that the input and out- put shaft centerlines intersect. The two major types of bevel gears are str