What Is a V-Belt?
A V-belt is a versatile and green pressure capable of moving strength from one shaft to some other. Known for its 3-dimensional form, it’s miles securely wound into the folds of the rod. The precise shape of the V-belts enables them to match tightly and gracefully into the groove of a sheave, imparting extra top complement and balance.
When belt compression occurs, vertical forces perpendicular to the V-belt push its walls into the sheave grooves. As the forces increase, the belt engages harder in the sheave grooves, increasing friction on the belt surface and sheave walls Constantly increasing contact allows more torque to be transmitted, when the energy loss through slippage decreases Impact forces allow the conductor to carry heavy loads. The performance of a V-belt depends on how tightly it fits into the groove of the sheave when subjected to high pressure.
V-belts are made from synthetic vegetable rubber, making them smooth and resistant to bunch bending. Multiple winding ropes are compressed to the shape and size of the V-belt, a process that gives V-belts incredible strength and durability Some V-belt designs combine with bending resistance and provide them operating temperature is reduced by the addition of cogs.
Types of V-Belts
V-belts are available in a variety of styles. This chapter focuses on classifying v-belts according to their cross-sectional dimensions. The most common lines are standard, wedge, narrow, fractional horsepower, striped, serrated, and double. These cross-sections are standardized by organizations, such as ISO, BS, & DIN.
- Standard V-Belt
- Narrow V-Belt
- Wedge V-Belt
- Double or Hexagonal V-Belt
- Banded V-Belt
- Fractional Horsepower V-Belt
- Cogged V-Belt
- Double Cogged V-Belt
- Agricultural V-Belt
- Poly-V Belt
- Variable Speed V-Belt
Now we discussed one by one:
1-Standard V-Belt
Standard v-belts, also known as classical or conventional v-belts, are the earliest V-belts, widely used in power transmission Standard v-belts come in various designs Y, Z, A, B, C, and D, and are designated E. Using DIN standards, the number in millimeters equal to the width of the top of the belt is named Inclusive squares of all sizes are 40°, and the ratio of top width to height is “1.6:1”
2-Narrow V-Belt
Narrow belts are like wedge belts. It is also used to move large loads in small spaces. The designations for narrow belts are 3V, 5V, and 8V.
| Designation | Top Width in mm | Height in mm | Recommended Minimum Pulley Pitch Diameter in mm |
|---|---|---|---|
| 3V | 9.7 (3/8″) | 8 | 63 |
| 5V | 15.8 (5/8″) | 14 | 140 |
| 8V | 25.4 (1″) | 23 | 335 |
3-Wedge V-Belt
Wedge belts are primarily used for reducing unnecessary high-force transmission. They can handle 1.5 to 2 times the weight of conventional V-belts with the same top width. Because of the higher strength, fewer wedge belts are needed to carry the load.
| Designation | Top Width in mm | Height in mm | Recommended Minimum Pulley Pitch Diameter in mm |
|---|---|---|---|
| SPZ | 10 | 8 | 63 |
| SPA | 13 | 10 | 90 |
| SPB | 17 | 14 | 140 |
| SPC | 22 | 18 | 224 |
4-Double or Hexagonal V-Belt
These look like two fiberglass v-belts with the tops forming an adjacent side. The tension rope is placed between two V-shaped blocks. Two v-belts are used for drives with one or more reverse curves because the two compression cores belt on either side of the belt.
| Designation | Top Width in mm | Height in mm | Recommended Minimum Pulley Pitch Diameter in mm |
|---|---|---|---|
| AA | 13 | 10 | 80 |
| BB | 17 | 14 | 125 |
| CC | 22 | 17 | 224 |
5-Banded V-Belt
A striped belt is a series of v-belts that are connected by a fabric overlay on top or parallel to the waistband. Each V-section can have an extension similar to classical, wedge, or narrow belts. Belt belts are most commonly used at high strength. They are designated by an H followed by a v-belt part number. Examples of striped v-belts include HA, HB, HSPA, HSPB, H3V, and H5V.
6-Fractional Horsepower V-Belt
This type of v-belt is used for lightweight applications. Examples of such applications include home appliances and machine shop equipment where power requirements are typically 1 horsepower or less. The most common horsepower sections of the belt are 2L, 3L, 4L, and 5L.
| Designation | Top Width in mm | Height in mm |
|---|---|---|
| 2L | 1/4 | 1/8 |
| 3L | 3/8 | 7/32 |
| 4L | 1/2 | 5/16 |
| 5L | 21/32 | 3/8 |
7-Cogged V-Belt
As described earlier, these belts have teeth or tusks on the lower side, allowing for minimal bending without being fully covered by the cladding, which is unheard of in the previous one. The toothed belt can take cross-sectional shapes with classical, wedge, narrow, striped, and fractional horsepower v-belts. Tooth belts are designated by an X followed by a v-belt part number, except for wedge belts. For examples (5VX, HAX, H3VX, ZX, AX, 3VX,) etc. Cogged wedge belts are referred to as XPA and XPB.
8-Double Cogged V-Belt
This design combines the principles of a double v-belt and a striped v-belt. Used in applications requiring high belt flexibility for small pulley radii. The pointed structure at the top of the belt is curved in its serpentine form. It is connected to several pulleys. The dimensions of the double-cogged V-belt are based on the manufacturer’s standards.
9-Agricultural V-Belt
These are clamped belts designed to accommodate dust, sand, grain, and so on. Additionally, rain and sunlight can damage rubber easily. For these reasons, agricultural V-belts are manufactured with high-strength polyurethane blends for the elastomer core and Kevlar fibers for the tensile cord Some manufacturers mix their specifications with classic, narrow, double-striped section v-belts. In terms of ISO standards, agricultural V-belts are called HI, HJ, HK, HL, and HM.
10-Poly-V Belt
Poly V is the market term for V-ribbed, multi-groove, or poly-groove belts. Unlike belted v-belts, they don’t have a fixed block size like the classic, wedge, and narrow v-belts. Their construction is smaller than pointy v-belts. Their reduced weight has improved maneuverability, making them suitable for more trailers. Polly V-belts allow ordinary people to move in a serpentine manner. The multiple V-belts are designated as PH, PJ, PK, PL, and PM.
11-Variable Speed V-Belt
This is a raw-edged v-belt with a wider cross-section than classical belts. Designed for use with variable speed pulleys. They can be cut into standard or random sizes. Variable speed belts are labeled differently from manufacturer to manufacturer. They are usually made of chloroprene rubber (Neoprene) or EPDM.
Uses And Overview Of V-Belt & Drives
Belt drives transmit power between two or more rotating shafts, usually on parallel axes of rotation. The belts form loops on pulleys which are attached to the driver and follower shafts. The pulleys are placed far apart from each other to create tension in the belt. Due to friction, the belt catches the pulley working.
The rotation of the drive pulley increases the tension on one side of the belt, creating a rigid side. This rigid wing exerts a tangential force on the follower pulley. Torque is then applied to the control rod. On the opposite side of the tight side is the loose side, where he feels the belt is less tight.
Several types of belt drives are in use today. The first was a flat waistcoat made of leather or cloth. Flat belts work well with low-power applications such as agricultural equipment, mining, and logging. However, when heavy acceleration is applied, they slide towards the back of the tube and climb out of the tube.
The flaws and imperfections of the original flat belt have been reduced and eliminated by modern technology. Numerous improvements and improvements in the design have enabled higher speeds, resulting in lower blade loads. Modern flat belts are thinner, more efficient, and able to prevent loss of energy. They are made from extruded polyamide, polyester, or aramid fabrics, materials that greatly increase their longevity and performance.
Another early belt drive was a rope fabricate of cotton or hemp rope, running on two pulleys with V-shaped grooves. The use of cables solved the problem of climbing out of pulleys, so that belt drives could be operated remotely, circular belts made of elastomeric materials such as rubber, nylon, and urethane were developed.
The most critical advances in belt substances had been the improvement of durable elastomeric materials which include natural rubber, artificial rubber, and numerous polymers, which gave belts the energy and endurance to withstand compression and strain the constant density of the belt was caused by the edge. V-belts, ribbed belts, multi-groove belts, and timing belts were developed to solve problems with previous belt drives.
V-Belt Geometry Terminology
A flat section of the V-belt is usually defined with parallel upper and lower sections. The shape of this plane can determine the type of V-belt. These dimensions are necessary to align the belt with the correct pulley.
V-belts are also defined by other geometries, such as the location of the pitch and the inner and outer lengths. Understanding these concepts is important when choosing a V-belt to ensure that the correct size and quantity are used to fit a job.
- Top Width: This is the larger side of the trapezium, parallel with the shorter side.
- Pitch Line or Pitch Zone: When bent, an unloaded v-belt stories each tensile and compressive stress. The outer facet is subjected to anxiety, while the internal side is underneath compression. The line wherein the strain is zero is referred to as the pitch line or pitch quarter.
- Relative Height: Relative top is a non-dimensional characteristic that is described as the ratio of the height to pitch width.
- Pitch Length: This is the length of the belt alongside the pitch line.
- Included Angle: This is the attitude made through the flanks whilst extended. The covered attitude of maximum v-belt sections is 40°.
- Top to Pitch: This is the length between the top aspect and the pitch quarter.
- Pitch Width: This is the width of the trapezium measured at the pitch.
- Height: This is the space among the pinnacle and backside facets of the trapezium.
- Inside Length: This is the length of the belt measured alongside the bottom side.
- Outside Length: This is the circumference of the belt measured along the top aspect.
V-Belt Construction
V-belts are a combination of various types of rubber, synthetic rubber and polymer with reinforcements. In normal use, the V-belt is subjected to a combination of tensile and compressive stresses. The upper part of the V-belt is subjected to longitudinal tensile force, while the lower part is compressed due to compression and bending against the grooves as the belt part moves over the pulley The surface of the belt requires various materials with high coefficient a friction as well as increased damage resistance.
Conclusion
A V-belt is a flexible device used to transfer energy between cords or corrugated folds. They are characterized by a trapezoidal cross-section.
V-belts are used because they can be secured in the groove of the pulley. This breaks up a lot of surface friction, reducing drag and power loss.
V-belts can be classified as clamped belts or raw edge belts. The wrapped v-belts are completely covered by foldable covers, while the raw base belts have bare sides.
V-belts can also be classified according to cross-section. The most common lines are standard, wedge, narrow, fractional horsepower, striped, serrated, and double.
We hope that we have cleared all yours questions about V-Belt. If you have any queries about the “V-Belt“ you can contact directly in my contact us page. Thanks for reading.
