V BELTS & PULLEYS HAVE SEVERAL USES
- To increase or reduce speed
- To increase or reduce torque
- To transfer power from one shaft to another
V BELT TYPES PREFIX DEFINED
Understanding the prefix of any v belt part number is important. The prefix offers dimensional standards, and somewhat defines the purpose of the v belt. This knowledge allows you to understand which v belts can be substituted, and which cannot.
2L, 3L, 4L, and 5L prefix – The “L” stands for light duty, and is designed for use with fractional horsepower motors. Meaning less than 1 HP. “L” style v belts are often designated as light duty industrial, or lawn & garden.
A, B, C, D, E, And AX, BX, CX, and DX size v belts are more industrial. They’re sometimes referred to as “Conventional” v belts. The “X” is a standard specification for inside perforations also known as notched or cogged v belts. Although “Conventional” v belts can be substituted for “L” style v belts which appear to be the same, “L” style v belts should never be used as replacements for “Conventional” v belts.
My experience with “X” designation v belts is that they last longer than those without it. 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 v belts due to the notched under-bottom.
3V, 5V, 8V, AVX, BVX, CVX, DVX – IMPORTANT: Don’t Confuse “V” In The Part Number Prefix! I run this warning because common sense would lead you to believe a 3V belt is a comparable substitute for a 3L, or that an AVX v belt is a suitable substitute for an AX v belt. Common sense would be wrong. The “V” designation in the prefix is a difference in the profile of the v belt. Never substitute or mix these v belts. They do not fit properly into pulleys designed for 3L and AX v belts. They do not make full contact against the bottom and walls, and therefore will fail to perform.
This article comes from micrometl edit released