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Basic Gear Terminology Face Width is the length of the teeth in the axial direction. Outside Diameter (O.D.) is the diameter of a circle around the outer surface, or tops of the gear teeth. Pitch Diameter (P.D.) is the diameter of the pitch circle. Pitch Circle.
What is spur gear terminology?
A spur gear is one of the simplest and most common types of cylindrical gears. Spur gears have straight teeth that run parallel to the shaft. These gears are easy to manufacture and can be used in a variety of applications
What is a gear pitch?
The diametral pitch of a gear is the number of teeth in the gear for each inch of pitch diameter. Therefore, the diametral pitch determines the size of the gear tooth. ... The pressure angle, as defined in this catalog, refers to the angle when the gears are mounted on their standard center distances.
Face of tooth:
It is defined as the surface of the tooth above the pitch circle is known as face.
Flank of tooth:
The surface of the tooth below the pitch circle is known as flank.
Top land:
The top most surface of the tooth is known as the top land of the tooth.
Face width:
Width of the tooth is known as face width.
Pitch Circle:
It is an imaginary circle which is in pure rolling action. The motion of the gear is describe by the pitch circle motion.
Pitch Circle diameter:
The diameter of the pitch circle from the center of the gear is known as pitch circle diameter. The gear diameter is described by its pitch circle diameter.
Pitch point:
When the two gears are in contact, the common point of both of pitch circle of meshing gears is known as pitch point.
Pressure angle or angle of obliquity:
Pressure angle is the angle between common normal to the pitch circle to the common tangent to the pitch point.
Addendum:
Distance between the pitch circle to the top of the tooth in radial direction is known as addendum.
Dedendum:
Distance between the pitch circle to the bottom of the tooth in radial direction, is known as dedendum of the gear.
Addendum circle:
The circle passes from the top of the tooth is known as addendum circle. This circle is concentric with pitch circle.
Dedendum circle:
The circle passes from the bottom of the tooth is known as dedendum circle. This circle is also concentric with pitch circle and addendum circle.
Circular pitch:
The distance between a point of a tooth to the same point of the adjacent tooth, measured along circumference of the pitch circle is known as circular pitch. It is plays measure role in gear meshing. Two gears will mesh together correctly if and only they have same circular pitch.
Diametrical pitch:
The ratio of the number of teeth to the diameter of pitch circle in millimeter is known as diametrical pitch.
Module:
The ratio of the pitch circle diameter in millimeters to the total number of teeth is known as module. It is reciprocal of the diametrical pitch.
Clearance:
When two gears are in meshing condition, the radial distance from top of a tooth of one gear to the bottom of the tooth of another gear is known as clearance. The circle passes from the top of the tooth in meshing condition is known as clearance angle.
Total depth:
The sum of the addendum and dedendum of a gear is known as total depth. It is the distance between addendum circle to the dedendum circle measure along radial direction.
Working depth: