# Quick Answer: How V Belts Are Specified?

## Which type of belt has highest accuracy?

urethane timing beltsTopics of discussion: Reinforced urethane timing belts work well in high-accuracy linear motion and conveying applications because they stretch very little, do not creep or slip, and are much stiffer than neoprene, which means less tooth deflection..

## Is standard for V belt?

This International Standard defines terms relating to V-belt drives, V-belts, hexagonal belts, joined V-belts and the corresponding V-grooved pulleys, V-ribbed belt drives, V-ribbed belts and V-ribbed pulleys, as well as the corresponding symbols.

## How do you read a Gates V-belt number?

First two digits indicate belt top width. 67= 3/8″, 68= 1/2″, 69= 21/32″ Last two digits indicate length in inches. Example: PoweRated V-Belt 6823 has a 1/2″ top width and a 23″ O.C.

## What does the letter C stand for in a C80 50 V-belt?

C – The C stands for a “C” section v-belt. This is considered a “Classic” v-belt style that has a top width of 7/8 (0.875) inches and a thickness of 17/32 (0.531) inches. 80– 80 inches is the inside circumference of the belt. … So, the outside circumference of the C80 belt is 84 inches (80+4).

## What is pitch length of v belt?

The pitch length is obtained by adding the pitch circumference of one sheave to twice the center distance between two equal diameter sheaves at a specified tension. [More recently changed to datum length.] The belt pitch length is normally the length at the belt pitch line.

## How are V-belts designated sized?

Use a cloth measuring tape (not a steel one) and wrap it around the outside of the belt. You also use a thin string to take this measurement and place it on a steel tape to get the correct length. Next, for “A” Belts (1/2” width) subtract two-inches from the outside measurement to select the correct V-belt.

## Are notched V-belts better?

A notched belt has grooves or notches that run perpendicular to the belt’s length, which reduces the bending resistance of the belt. Notched belts can use the same pulleys as cross-section standard V-belts. They run cooler, last longer, and are about 2% more efficient than standard V-belts.

## What angle are V-belts?

40° angleAll v-belts have a 40° angle between the faces, except the V series (aka “Harvester” or “Wedge” belts), which have a 30° angle between the faces. You will notice that the inside edge of the belt is wider than the base of the V in a v-belt pulley – the belt touches the pulley only on the sides.

## How do you read V-belt length?

How to Read a V-Belt SizeRead the outside surface of the belt for the prefix 4L or 3L.Read the three-digit number after the prefix to identify the belt’s length. For example, if the belt reads 4L460, you know the belt is 12.5mm wide, with a 46-inch outside circumference.

## What is the difference between ab belt and a BX belt?

Meaning a “BX” belts last longer than a “B” Belt. Especially in cases where one or more of the pulleys are small in diameter. Smaller diameter pulleys offer less stress on “X” style belts due to the notched under-bottom. … The “V” designation in the prefix is a difference in the profile of the belt.

## What do V belt numbers mean?

The number following it is the outside length of the belt in tenths of inches. The inside length of the belt is typically 2″ less for a 4L belt, and 1-1/2” less for a 3L belt. … “Classic” v-belt numbers start with a letter identifying the cross section, “A” through “E” – see V-Belt Dimensions below.

## How many types of V-belts are there?

threeThere are three common V belt types: Classical V-belt (classified by their dimensions from A to E), Narrow V series (classified by their dimensions 3V, 5V, and 8V), and light duty Fractional Horsepower belt (classified by their dimensions 2L, 3L, 4L, 5L).

## Where are V-belts used?

V-Belts and Wedge Belts are commonly used in industrial applications and also in auto repairs.

## Why do V-belts have teeth?

They require tension to maintain the right amount of friction. Flat belts are the purest form of friction drive while V-belts have a friction multiplying effect because of wedging action on the pulley. Positive drive or synchronous belts rely on the engagement of teeth on the belt with grooves on the pulley.

## What is V-belt drive?

The V-belt drive technology is based on the belt tracking in a mating groove in the belt pulley. The more power that is transmitted, the more belts and grooves in a row. The flat belt technology is based on the high friction of the belt against the crowned belt pulleys, and the transmission only contains one belt.

## What is the difference between a 4L belt and an a belt?

The 4L series belt is a light duty belt, a A series belt will last longer.

## How do you identify V-belts?

V-belt cross sections can be identified by their top width and depth dimensions. For example, a v-belt with a top width of 21/32” and a depth of 7/16” is a “B” belt. You can also use our Browning Belt Rule that includes a gauge to help easily identify belt type.

## When should I replace my V belt?

A belt should easily last three or four years, if adjusted to the proper tension. It’s a good idea to have all of the belts replaced routinely every 30,000 to 40,000 miles when you have the engine tuned up.

## What are the two types of drive belts?

There are two types of accessory belts, V-type and serpentine. Which one you have depends on your specific vehicle. Since the mid-1990s, most cars and trucks use serpentine belts, though you may find a few stragglers into the early 2000s. The accessory belt(s) are what connect the accessories to the crankshaft.

## What are V-belts made of?

V-belts, with a trapezoidal or V shape, made of rubber, neoprene, and urethane synthetic materials, replaced flat belts. Now, the increased overall surface material of modern belts adheres to pulley grooves through friction force, to reduce the tension required to transmit torque.