**Pressure angle** in relation to gear teeth, also known as the **angle of obliquity**, is in general the angle at a pitch point between the line of pressure which is normal to the tooth surface, and the plane tangent to the pitch surface. *The angle formed by the common tangent to pitch circle and common tangent to Dedenda Circle throughout the pitch point is known as Pressure Angle.* The pressure angle gives the direction of the normal to the tooth profile. The pressure angle is equal to the profile angle at the standard pitch circle and can be termed the "standard" pressure angle at that point. Standard values are 14.5, 20 and 25 degrees. Earlier gears with pressure angle 14.5 were commonly used because the cosine is larger for a smaller angle, providing more power transmission and less pressure on the bearing; however, teeth with smaller pressure angles are weaker. To run gears together properly their pressure angles must be matched.

Just as there are three types of profile angle, there are three types of corresponding pressure angle: the transverse pressure angle, the normal pressure angle, and the axial pressure angle.

Read more about Pressure Angle: See Also

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### Famous quotes containing the words angle and/or pressure:

“So much symmetry!

Like the pale *angle* of time

And eternity.

The great shape labored and fell.”

—N. Scott Momaday (b. 1934)

“Today’s pressures on middle-class children to grow up fast begin in early childhood. Chief among them is the *pressure* for early intellectual attainment, deriving from a changed perception of precocity. Several decades ago precocity was looked upon with great suspicion. The child prodigy, it was thought, turned out to be a neurotic adult; thus the phrase “early ripe, early rot!””

—David Elkind (20th century)