This is a bevel gear with a helical angle of spiral teeth. The straight bevel gear is both the simplest to produce and the most widely applied in the bevel gear family. ![]() This is a gear in which the teeth have tapered conical elements that have the same direction as the pitch cone base line (generatrix). ![]() The double helical form balances the inherent thrust forces. A Helical Rack can be regarded as a portion of a helical gear with infinite radius.Ī gear with both left-hand and right-hand helical teeth. This is a linear shaped gear that meshes with a helical gear. Helical gears can bear more load than spur gears, and work more quietly. This is a cylindrical shaped gear with helicoid teeth. Internal gears are often used in planetary gear systems. This is a cylindrical shaped gear, but with the teeth inside the circular ring. Gear rackis a portion of a spur gear with an infinite radius. This is a linear shaped gear which can mesh with a spur gear with any number of teeth. It is the most commonly used gear with a wide range of applications and is the easiest to manufacture. This is a cylindrical shaped gear, in which the teeth are parallel to the axis. Particularly for bevel gears, it is assumed that the efficiency will decrease if improperly mounted from off-position on the cone-top. Nonparallel and nonintersecting gears, such as screw gears or worm gears, rotate with relative slippage and by power transmission, which tends to produce friction and makes the efficiency lower when compared to other types of gears.Įfficiency of gears is the value obtained when the gears are installed and working accurately. Since meshing of paired parallel axis gears or intersecting axis gears involves simple rolling movements, they produce relatively minimal slippage and their efficiency is high. These figures do not include bearing and lubricant losses. Table 1.1 Types of Gears and Their CategoriesĪlso, included in table 1.1 is the theoretical efficiency range of various gear types. Table 1.1 lists the gear types by axes orientation. Worm gearand hypoid gears belong to the third category. Gears are classified into 3 categories parallel axes gears, intersecting axes gears, and nonparallel and nonintersecting axes gears.īevel gearsare intersecting axes gears. The most common way to classify gears is by category type and by the orientation of axes. ![]() This section introduces those technical words along with commonly used gears and their features. Gears are identified by many types and there are many specific technical words to describe their definition.
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