V-belt model specifications and length calculation formula - Knowledge - Hangzhou Grand Transmission Tech Co., Ltd. (2024)

Nov 15, 2020

Speaking of triangle belts, I believe that many laymen do not understand what type A, B, and C represent, and what is the difference between them. Let's study the knowledge of triangle belt in detail below.1. The specifications and models of the triangle beltThe specifications of the V-belt are divided by the size of the back width and height (thickness). According to the different back width and height (thickness) dimensions, the national standards stipulate the O, A, B, C, D, There are many models such as E. The pitch width, top width and height of the V-belt of each model are different, so the pulley must be made into various grooves according to the shape of the V-belt; these different grooves are determined O-type pulley, A-type pulley, B-type pulley, C-type pulley, D-type pulley, E-type pulley and other types of pulleys.2. V-belt sizeThe cross-sectional dimensions of the A-type triangle belt are: the top width is 13MM, and the thickness is 8MM.The section size of the B-shaped triangle belt is: the top width is 17MM, and the thickness is 10.5MM.The section size of the C-shaped triangle belt is: the top width is 22MM, and the thickness is 13.5MM.The section size of the D-shaped triangle belt is: the top width is 21.5MM, and the thickness is 19MM.The section size of the E-shaped triangle belt is: the top width is 38MM, and the thickness is 25.5M.3. Calculated length of triangle beltGenerally, the accuracy of calculating the length of the V-belt is not high, and most V-belt transmission equipment has room for belt length adjustment.The calculation principle of the length of the V-belt is that the length of the V-belt is the part attached to the big wheel + the part attached to the small wheel + the suspended length.A more precise calculation formula is:(1) L=π(R+r)+2a+(R-r)^2/a(2) L=π(R+r)+2a+(R-r)^2/4aWhere L is the belt length, R and r are the radii of the two pulleys respectively, and a is the distance between the centers of the two pulleys.

A more precise calculation formula is: (1) L=π(R+r)+2a+(R-r)^2/a (2) L=π(R+r)+2a+(R-r)^2/4a Where L is the belt length, R and r are the radii of the two pulleys respectively, and a is the distance between the centers of the two pulleys.

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.

Start the tape measure at the hole you use and measure to the end of the belt, where it meets the buckle.Belts are measured in inches and you should round to the nearest inch. If you measure 36 inches, you will want to purchase a size 36 belt. Note: This measurement technique is standard for Proper Cloth belts.

First two digits indicate belt top width.67 = 3/8”, 68 = 1/2”, 69 = 21/32” Last two digits indicate length in inches. Example: 6823 Belt has a 1/2” top width and a 23” O.C. Made by joining two or more single V-Belts with a permanent, high strength tie-band.

Belt Effective Length: The effective length of a belt is the length about the effective outside diameter of a sheave at a specified tension. The effective outside diameter of a sheave is measured where the groove top width is a dimension as specified by RMA, ASAE or SAE standards.

V-belts should ride at least flush with the top of the pulley and may ride out up to 0.2”. Check for burrs, nicks, gouges and severe scratches as these will drastically reduce belt life.

V-belt cross sections are categorized based on their top width and depth measurements. Each width/depth combination is labelled using a letter of the alphabet. For example, v-belts with 21/32 in. width and 7/16 in.

Measure the v-belt span length (Figure 2 labeled A) using tape. Calculate the deflection distance (Figure 2 labeled B). The deflection distance is approximately 1/64 inch (0.4 mm) of the span length.

36– 36 inches is the inside circumference of the belt. For A-section v-belts, the outside circumference is found by adding 2 inches to the inside length of the belt. So, the outside circumference of the A36 belt is 38 inches (36+2).

The increment of the force in the belt at any point within the contact angle is physically due to the local friction force, so that dT = fR dϕ = μpR dϕ.

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