Category: Theory of Machines.

Interference in Involute Gears

The tooth tip of the pinion will then undercut the tooth on the wheel at the root and damages part…

Length of Arc of Contact

Arc of contact is the path traced by a point on the pitch circle from the beginning to the end…

Length of Path of Contact

Consider a pinion driving wheel as shown in figure. When the pinion rotates in clockwise, the contact between a pair…

Systems of Gear Teeth

The following four systems of gear teeth are commonly used in practice: 1.   14 ½O  Composite system 2.   14 ½O  Full depth…

Advantages of Cycloidal gear teeth

1.  Since the cycloidal teeth have wider flanks, therefore the cycloidal gears are stronger than the involute gears, for the same…

Forms of Teeth

Involute Profile The following examples are involute spur gears. We use the word involute because the contour of gear teeth curves inward.…

Conjugate Profiles

To obtain the expected velocity ratio of two tooth profiles, the normal line of their profiles must pass through the corresponding pitch…

Constant Velocity Ratio

For a constant velocity ratio, the position of P should remain unchanged. In this case, the motion transmission between two gears is…

Gear-Tooth Action

Terms Used in Gears

Fig. 4.2. Spur Gear and Pinion pair Terms used in Gear Addendum: The radial distance between the Pitch Circle and the…

Neither parallel nor intersecting shafts

Helical gears may be used to mesh two shaftsthat are not parallel, although they are still primarily use in parallel…

Gears for connecting parallel shafts

1.      Spur gears: Spur gears are the most common type of gears. They have straight teeth,and are mounted on parallel shafts. Sometimes,…