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. Gears have many terminologies, parameters and principles. One of the…
Conjugate Profiles
To obtain the expected velocity ratio of two tooth profiles, the normal line of their profiles must pass through the corresponding pitch point, which is decided by the velocity ratio. The two profiles…
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 equivalent to the motion transmission between two imagined slip-less cylinders…
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 top of the teeth. Dedendum: The radial distance between the bottom of 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 shaft applications. A special application in which helical gears are…
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, many spur gears are used at once to create very…
Classification of Toothed Wheels
According to the Position of Axis of Shaft (a) Parallel (b) Intersecting (c) Non-intersecting and non-parallel According to the peripheral velocity of the gears (a) Low velocity, less than 3…
Advantages and Disadvantages of Gear Drive
The following are the advantages and disadvantages of the gear drive as compared to belt, rope and chain drives: Advantages: 1. It transmits exact velocity ratio. 2. It may be used to…
Gear Drive
Introduction The slip and creep in the belt or rope drives is a common phenomenon, in the transmission of motion or power between two shafts. The effect of slip is…
