What is mean by pitch line velocity?

What is mean by pitch line velocity?

An important consideration for a gear unit is the pitch line velocity (PLV), which is the product of the gear or pinion pitch diameter and the shaft speed of the gear or pinion.

What is pitch line velocity formula?

However, the term “pitch line” is often used when discussing the equivalent linear velocity of a circular gear – i.e. “pitch line velocity.” Pitch line velocity is a function of the gear’s pitch diameter and its rotational speed: Where: PLV = pitch line velocity (m/s) dp = pitch diameter (m)

What is the pitch of a gear and why is it important?

Point P is very important to the velocity ratio, and it is called the pitch point. Pitch point divides the line between the line of centers and its position decides the velocity ratio of the two teeth. The above expression is the fundamental law of gear-tooth action.

What is pitch point in gear?

The pitch point is the point of tangency of two pitch circles (or of a pitch circle and pitch line) and is on the line of centers.

What is base pitch in gears?

There is one dimension common to both members of a pair of properly mating spur gears – the base pitch (BP). This base pitch is equal to the circular pitch of the gear on the base circle (see Fig. For parallel axis helical gears, both the TBP and NBP must be the same on both mating gears.

Why is pitch circle important in gears?

Pitch circles of mating gears are tangent to each other, and have identical linear velocities. For that reason, pitch circles, rather than base circles, are used in many gear calculations. The operating pitch circles will respond to any variations in center distance of the pair by enlarging or contracting. Pitch Point.

What is pitch point?

Definition of pitch point : the point of contact of the pitch lines of two gears or of a rack and pinion when in mesh.

What is a base pitch?

Base Pitch (BP) equals the arc distance along the circumference of the base circle between two adjacent profiles running in the same direction. A constant Base Pitch (BP) can be delivered by changing the circular pitch and cosine of the pressure angle. Changing the number of teeth can also change the circular pitch.

What is gear pitch?

The pitch of a gear is defined as the distance between two identical points on two adjacent gear teeth. Ideally, it is measured at the pitch line, labeled in Figure 1 as the reference line. This method of determining the size of the gear tooth is based on the unit circle.

What is the pitch circle of a gear?

Pitch circle: The circle, the radius of which is equal to the distance from the center of the gear to the pitch point. This is where the gear’s speed is measured. Pitch diameter: Diameter of the pitch circle. Pitch point: The point of tangency of the pitch circles of a pair of mating gears.

What’s pitch line velocity in gears?

Pitch line velocity is the speed that a gear moves at its pitch line, where it comes into contact with another gear and rolls without slipping. The diameter of the pitch line (or pitch circle) is halfway between the root and tip of tooth of the gear.

What is the pitch of a gear?

The diametral pitch of a gear describes how densely its teeth are set around it. The pitch is the ratio between the number of teeth and the gear’s size, and engineers always express it as a whole number.

What is pitch line velocity?

Pitch line velocity is measured at the pitch line of the gear, which is midway along the length of the gear teeth. For circular gears, the pitch line is more correctly referred to as the pitch circle, which is an imaginary circle that rolls without slipping when aligned with the pitch circle of the mating gear.

What is circular pitch gear?

The circular pitch, or pitch, is the distance between the teeth of a gear. For two gears to interlock, the distance from one tooth along the pitch circle to the next tooth must be the same in both gears. Otherwise, they will not be synchronized when they rotate.