Terms Used in gear and planetary gear ratio calculate

About Gear:-

When students have completed the two ratio columns, they can discuss their findings. Is there a relationship between the gear ratio and the tooth ratio? What is that relationship? Allow students time to express their ideas. Ask them to provide reasons for their statements. Help students see how the tooth ratio can be used to find the gear ratio. This relationship between the tooth ratio and the gear ratio is very important. It allows us to find a gear ratio without actually having to build a gear train and turn the gears. We can find the ratio of any two gears if we know the number of teeth on each of the gears. Show students how the gear ratio can be expressed as a fraction.

 Write this equation on the board:

 Gear ratio = rotations of driver gear between rotations of the driven gear.

Gear ratio =  rotations of driver gear between rotations of the driven gear.

                   =  teeth of the driven gear/teeth of driver gear

Terms used in gears:-


 Pitch circle:- It is the imaginary circle that circle by the pure rolling action, would give the same motion as the actual gear.


Pitch circle diameter:- it is the diameter of the circle. The size of the gear is usually specified by the Also called pitch diameter.


Pitch point:- it is a common point of contact between two Pitch Circle.

Pitch surface:- the surface of the Rolling dice which of the messing gear have replaced at the Pitch Circle.

Pressure angle for angle of obliquity:- it is the angle between two common normals to gear teeth at the point of contact and the common tangent at the pitch point. It is usually donated by the standard pressure angle for point 14.5° and 20°..

Addendum:- is the radial distance of a tooth from the circle to the top of the tooth.

Dedendum:- it is the radial distance of a tooth from the physical to the bottom of the tooth.

Addendum circle:- it is the circle drawn to the top of the teeth and is concentric with the Pitch Circle.

Dedendum circle:- it is the circle drawn through the bottom of the teeth. It is also called root circle.

Note- root circle diameter = pitch circle diameter x cosφ . ,  where φ is the pressure angle.

Circular pitch:- it is the distance measured on the circumference of the Pitch Circle from a point of one tooth to the corresponding point on the next tooth. Is usually donated by Pc mathematically,
 circular pitch..,,,,
                                                               Pc = π D / T
                                                                                                  where,
                                                                                                               D = distance of the pitch circle.
                                                                                                               T  = number of teeth on the wheel.

A little consideration will you show that the two gear mesh together correctly. If the two wheels have the same circular pitch.

Note:- if D1 and D2 are the diameter of the two messing gear having the teeth T1 and t2 respectively Then for them mesh correctly.....

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