Transverse Plane
Transverse plane refers to the plane that is vertical to the axis of gear.
Normal Plane
Generally, normal plane refers to the plane containing one point M in the tooth trace and also vertical to the tooth trace (See figure 5-4). This kind of plane is called normal plane. For most of the gears, the standard references are stipulated on normal plane.
Axial Plane
Any plane containing gear axis can be called axial plane. Axial plane plays an important role in the usage of helical gear and worm.
Transverse Plane of Tooth
Transverse plan of tooth refers to the plan that is vertical to the generatrix of reference surface of the gear (see figure 5-5).
Tooth Profile
Tooth profile refers to a transversal cut by a fixed surface intersecting with tooth trace. See Figure 5-4, Figure 5-6 and Figure 5-7.
Normal Profile
Normal profile refers to the transversal cut by the normal plane. Normal profile is one of the basic terms used in geometry relating to helical-spur gear, cylindrical worm gear and cylindrical worm.
Transverse Profile
Transverse profile refers to the transversal cut by transverse plane (see Figure 5-6). Transverse profile is a basic geometric terms used in cylindrical gear. The transverse tooth profile of straight-tooth cylindrical gear is overlapped with its normal profile.
Axial Profile
Axial profile refers to the transversal cut by axial plane. Axial profile is a basic term used in worm and worm gear.
Tooth Trace
Tooth trace is the intersection line between flank and reference surface (see Figure 5-8). Tooth surface can be straight line, curved line or spiral line.
Tip/Tooth Tip
The intersection line between the tooth flank and the surface of tooth tip is called tooth tip. Tooth tip can be straight line, curved line or spiral line.
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