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V-Belt

V-Belt

Your Professional V-Belt Manufacturer in China!

 

 

Our factory is a professional factory producing rubber belts, We are one of the leading manufacturers in the research, design, manufacturing, and distribution of various power transmission belts in China.

 

Why Choose Us

Wide Product Range

Our products cover Auto Transmission belts such as cogged V-belts, Ribbed V-belts, timing belts, Industrial transmission belts such as REL&REP belts, etc.

Broad Market

Our products are exported to dozens of countries/regions in Southeast Asia, the Middle East, Africa, and the United States.

 

Advanced Equipment

Our factory independently manufactures and improves equipment, adheres to technological innovation, and independently develops and introduces advanced equipment.

Professional Service

We have an experienced and professional customer support team to provide flexible service to customers around the world, giving full support from product design to marketing.

Please tell me the model of V-belts that you need; we can give you the quotation ASAP.

 

 

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Definition of V-Belt

 

 

A V-belt is a wedge-shaped belt manufactured out of a rubber compound, reinforced with a tensile cord specifically engineered to transmit power into movement. V-belts can be found in driving mechanisms, such as engines in air compressors, fans, and pumps. They are available in a variety of sizes and materials to meet the needs of particular applications.

 

How Do V-Belts Work
 

Unlike flat belts, which rely solely on friction and can track and slip off pulleys, V-belts have sidewalls that fit into corresponding sheave grooves, providing additional surface area and greater stability. As belts operate, belt tension applies a wedging force perpendicular to their tops, pushing their sidewalls against the sides of the sheave grooves, which multiplies frictional forces that allow the drive to transmit higher loads. Vertical force (Fv) applied perpendicular to belt top creates high sidewall forces (Fn) to transmit higher loads. V-belts are made from rubber or synthetic rubber stocks, so they have the flexibility to bend around the sheaves in drive systems. Fabric materials of various kinds may cover the stock material to provide a layer of protection and reinforcement.

 

Advantages of V-Belts

 

1

Simple and Compact Design: V-belts have a straightforward design and take up little space, allowing them to fit into compact engine compartments.

2

Efficient Power Transmission: The 'V' shape design allows for high friction and a good grip on the pulley, minimizing slip and delivering effective power transmission.

3

Low Maintenance: V-belts require minimal maintenance compared to other types of mechanical linkages. While they do need to be replaced eventually, they can typically run for a long time before this is necessary.

4

Noise and Vibration Damping: V-belts can absorb vibration and reduce noise, leading to quieter operation.

5

Shock Load Protection: If a sudden load is applied, the V-belt can slip in the pulley grooves, preventing a shock load from being transmitted through the system and potentially causing damage.

 

Types of V-Belts

 

Standard V-Belt: The standard v-belt, also known as classical or conventional v-belt, is the earliest forms of V-belt and is widely used in power transmission. Standard v-belts have various dimensions designated as Y, Z, A, B, C, D, and E. When using DIN standards, their designation is denoted by numbers equal to the belt's top width in millimeters. All sizes have an included angle of 40° and a top width to height ratio of 1.6:1.

Wedge V-Belt: Wedge belts are a primarily used for high power transmission with reduced space requirements. They can operate at 1.5 to 2 times the load of classical v-belts with the same top width. Because of the higher power rating, fewer wedge belts are needed to transmit the load. Like classical v-belts, the included angle of wedge belts is also 40°, but they have a different top width to height ratio of 1.2:1. They have better cord construction and placement, providing the highest strength while in motion. Wedge belts are designated as SPZ, SPA, SPB, and SPC.

Narrow V-Belt: Narrow belts are similar to wedge belts. They are also used for transmitting larger loads in a smaller form. The designations used for narrow belts are 3V, 5V, and 8V. The numbers denote the top width of the belt multiplied in terms of 1/8 of an inch. Like other belt sections, its included angle is also 40°. Narrow belt sections are standardized and mostly used in the North American region. They partially conform to the profile of a wedge belt. Section 3V corresponds to SPZ and 5V to SPB. 3V and 5V belts can be used for SPZ and SPB pulleys, respectively.

Double or Hexagonal V-Belt: These are similar to two mirrored v-belts with their top sides as the adjoining side. The tension cord is placed between the two V-shaped sections. Double v-belts are used for drives with one or more reverse bends since the two compression cores allow the belt to be bent from either side. This property makes double v-belts suitable for drives with multiple pulleys that must be driven either clockwise or anti-clockwise. Double v-belt sections are designated as AA, BB, and CC.

Banded V-Belt: A banded belt is several v-belts joined together in parallel by a fabric cover or band at the top side. Each V-section can have the dimensions of classical, wedge, or narrow belts. Banded belts are mostly used in high-power applications. They are designated by an H followed by the v-belt section number. Examples of banded v-belts are HA, HB, HSPA, HSPB, H3V, and H5V.

Fractional Horsepower V-Belt: These types of v-belts are used for light-duty applications. Examples of such applications are household appliances and machine shop equipment where the power requirement is about 1 horsepower or less. Common fractional horsepower belt sections are 2L, 3L, 4L, and 5L. The number before the L denotes the top width of the belt multiplied in terms of 1/8 of an inch.

Cogged V-Belt: These belts have cogs or notches at the bottom side, which allows them to be bent at a smaller radius. They are not fully wrapped with fiber cover, unlike the previous types. Cogged belts can take the cross-section dimension of classical, wedge, narrow, banded, and fractional horsepower v-belts. Cogged belts are designated with an X after the v-belt section number, except for wedge belts. Example designations are ZX, AX, 3VX, 5VX, HAX, H3VX, etc. Cogged wedge belts are designated as XPA, XPB, and so on.

Double Cogged V-Belt: This design has the combinations of principles behind a double v-belt and a cogged v-belt. They are used in applications that require high belt flexibility for a small pulley radius. The cogged construction at the top side of the belt allows it to be bent in a serpentine-like path. This is used for driving multiple pulleys. Double cogged v-belts dimensions depend on manufacturer standards.

Agricultural V-Belt: These are wrapped belts designed for more extreme abrasion from dust, sand, grains, and others. Also, they are exposed to rain and sunlight, which can easily degrade ordinary rubber compounds. Because of these, agricultural v-belts are made of more durable polyurethane blends for the elastomer core and Kevlar fibers for the tensile cords. Some manufacturers mix their specifications with classical, narrow, double, and banded section v-belts. When referring to ISO standards, agricultural v-belts are designated as HI, HJ, HK, HL, and HM.

Poly-V Belt: Poly V is the common market term for V-ribbed, multi-groove, or poly-groove belts. Unlike banded v-belts, they do not have the standard section dimensions of classical, wedge, and narrow v-belts. They have a more compact construction than banded v-belts. They have improved flexibility because of their reduced thickness, making them suitable for driving multiple pulleys. Poly V-belts can take a serpentine path with the help of idlers. Poly V-belts are designated as PH, PJ, PK, PL, and PM.

Variable Speed V-Belt: This is a raw edge cogged v-belt with a wider cross-section than classical belts. They are designed to be used with variable speed pulleys. Their section can be made into standard or non-standard sizes. Designations for variable speed belts vary from each manufacturer. They are usually made from chloroprene rubber (Neoprene) or EPDM.

 

Applications of V-Belts
BX-type Auto Belts
Automotive V-belts
AX Type Belt
Cutting V Belt

V-belts are widely used across various industries due to their effective power transmission capabilities, compactness, and ease of maintenance. They're especially common in applications where a certain amount of slippage is beneficial. Here are some key applications for V-belts:
Automotive Industry: In automobiles, V-belts are often used to transmit power from the engine's crankshaft to various peripheral devices, such as the alternator, power steering pump, air conditioning compressor, and the water pump.
Industrial Machinery: V-belts are frequently used in machinery for power transmission. For instance, they might be used in a lathe to drive the spindle, or in other machines to drive conveyors, fans, or other components.
Agricultural Equipment: In agricultural machinery such as tractors and combine harvesters, V-belts are commonly used due to their durability and the ease with which they can be replaced in the field.
HVAC Systems: In Heating, Ventilation, and Air Conditioning systems, V-belts are often used to drive the fans and blowers that circulate air.
Home Appliances: V-belts can also be found in many home appliances like washing machines and vacuum cleaners, where they drive the various moving parts.
Power Tools: Many power tools, including drills, saws, and sanders, use V-belts to transmit power from the motor to the tool bit.
Pumps: Many types of pumps, such as water pumps or fuel pumps in industrial settings, use V-belts for power transmission from the drive motor to the pump.
Textile Industry: V-belts are used in various machines in the textile industry, including looms and spinning machines, to drive different components.
Mining Industry: In mining operations, V-belts are used in a variety of machinery and conveyance systems, where they provide reliable power transmission under challenging conditions.
Woodworking Machinery: In wood processing equipment, such as saws or planers, V-belts are often used due to their ability to handle high loads and resist slippage.
Exercise Equipment: Some pieces of exercise equipment, such as treadmills, use V-belts to transfer power from the motor to the track.
Generators: V-belts are often used in generators to link the engine that produces mechanical power to the alternator that produces electrical power.

 

Construction of V-Belt
 

A V-belt is a composite of different types of rubber, synthetic rubber, and polymers that are combined with reinforcements. In its usual application, a V-belt is subjected to combined tensile and compressive stresses. The top side of a V-belt is subjected to a tensile force directed longitudinally, while the bottom side is compressed due to the compression against the grooves and bending as a belt segment passes the pulley. The surface of the belt needs different types of materials with a high coefficient of friction and increased wear resistance.

V-Belt Fabric Cover

The fabric cover of V-belts makes contact with the surface of the sheave. It is made of a material capable of withstanding high abrasion and is resistant to contaminants. It protects the elastomer and tension cord from the harmful effects of chemicals, corrosion, and high temperatures. Often referred to as wrapped V-belts, coverings give V-belts a uniform look, feel, and smoothness. The proper covering suppresses noise from the belt when it is in operation. The abrasion resistance of V-belts increases their durability since contact with the sheave normally occurs at exceptionally high speeds.
Aside from the obvious benefits of texture and appearance, wrappings or coverings increase friction with the surface of the sheave to prevent slippage. When torque spikes happen, V-belts are forced to make an immediate response. Raw V-belts buckle and break under such conditions, while wrapped or covered V-belts will slip before sending power back to the gearbox or drive as a safety precaution.

V-Belt Tension Cord or Member

Tension cords are embedded into the rubber compound of a V-belt, creating a composite structure, and are power-transmitting components. They are positioned at the pitch diameter of the belt cross-section to increase tensile strength. Tension cords are made of polyester, steel, or aramid fibers. In some V-belt constructions, the tension cord is bonded into the core by an adhesion rubber. To increase the strength of tension cords, they are made of continuous material, like wire, without joints. The design provides essential reinforcement, tensile strength, and durability to withstand the transmission of torque.
V-belts are designed to transfer rigidity, which is at high levels across the width of a V-belt and requires tensile cords to transfer the load equally. The flexibility of the tension cord is necessary to reduce heat and stress from bending. All of these factors are accomplished by the parallel arrangement of the tension cord.
The tensile cord is held in place by adhesion gum that forms a bond between it and the rubber stock elastomer core. The bonding of the two elements forces the different components to perform as a single unit.

V-Belt Elastomer Core

The elastomer core holds the components together and gives a V-belt its trapezium cross-section. It is made from a variety of materials with shock resistance, high flexural strength, and temperature stability. Common elastomers used are neoprene, EPDM, and polyurethane. In some designs, the elastomer core is divided into two sections separated by the tension cord placed between a top cushion of rubber above and compression rubber below. The two sections are made from different types of rubber because of the stresses they experience.

Wrapped and Raw Edge V-Belts

In terms of structure, v-belts can be categorized as wrapped belts and raw edge belts. Wrapped v-belts are considered standard v-belts with all sides wrapped in a fabric cover. Wrapped v-belts have a higher resistance against external elements and quieter operation. However, the downside is a lower coefficient of friction resulting in power loss. Wrapped v-belts are used on applications that require some amount of slippage without damaging the belt.
In contrast with wrapped v-belts, raw edge v-belts do not have covers at their flanks. This means the elastomer core is exposed and in contact with the surface of the pulley. The elastomer core has a higher coefficient of friction than the fabric-covered ones, allowing for better grip. The elastomer core of raw edge v-belts has higher wear resistance than the core found on wrapped v-belts. Raw edge v-belts are further divided into three types:
Raw Edge Plain (REP): With raw edge plain, the top surface is covered with one or more layers of a fabric cover with covering at the bottom side present or not, depending on the design.
Raw Edge Laminated (REL): Raw edge laminated types of v-belts are similar to REP but have additional layers of laminate fabric at the elastomer core. The addition of the laminated fabrics helps reduce noise.
Raw Edge Cogged (REC): Raw edge cogged, also known as raw edge notched V-belts, have cogs or notches at the bottom side of the belt. Cogs improve the flexibility of the belt, allowing use for pulleys with small diameters. The increased surface area at the bottom creates better heat dissipation, making them suitable for high-temperature applications.

 

How to Identify a V-Belt

 

 

If the branding on the v-belt is still intact, the easiest way to identify it is to simply read the part number. Unfortunately, after hours of use, the brand is often worn off and not legible. In this case, it becomes necessary to take note of the dimensions of the belt. You then need to find the measurements for your V-belt. The following steps will allow you to do so:

Step 1: Determine Belt Cross Section
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. depth are labelled a "B" belt. Specially designed Browning V-Belt Rules are also available with a gauge to help you select the correct belt type.

Step 2: Identify Belt Construction
V-belts are available in either wrapped or raw edge styles. A conventional wrapped v-belt will have an envelope of rubberized fabric covering the belt. A raw edge cogged v-belt will have exposed rubber sidewalls and moulded cogs on the bottom that resemble teeth. The following characteristics may also be present, depending on the construction type:
● Rubberized Fabric Cover – Cover envelopes the entire belt and protects the belt core.
● Top Fabric – Provides heat and oil resistance.
● Load Carrying Section – Cords (also known as tensile members) give the ability to transmit power and ensure uniform load distribution.
● Compression Section – Elastomer resists compression fatigue and dissipates internal heat build-up, providing firm lateral pressure against the sheave/pulley sidewall and distributing the load to the cords.
● Precision Molded Cogs – Provide additional flexibility, allowing for the use of smaller pulley diameters, and aiding in heat dissipation.

Step 3: Measure V-belt length
The most difficult part of identifying a v-belt is measuring the length. There is no precise method that is practical to perform in the field for v-belt measurement. Precise measurement requires a measuring fixture with pulleys of prescribed dimension and the ability to apply a specific tension to the belt according to ARPM (Association for Rubber Product Manufacturers) standards for the given belt section. Additionally, there are several terms used in the industry to describe length (e.g. inside length, outside length, pitch length, effective length) making it very confusing.
Some belt providers instruct end users to utilize tapes to measure outside length. While this method can approximate belt length, it can still be off by inches. If the drive has ample installation and take-up range, using a tape can yield a belt that will fit the drive in many cases, however, there is no guarantee it is the optimum length designed for the drive.

Step 4: Label the Drive
Finally, to avoid the issue of identifying the v-belt each time it needs to be replaced, a good maintenance practice is to properly label the drive with the correct belt part number. Use an adhesive sticker or any type of permanent signage where you can easily read the belt part number, making it easy to obtain belts in the future. Recording the date when the belts were installed can also enhance your maintenance program with increased uptime by knowing when to replace belts before they fail.

 

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Ultimate FAQ Guide to V-Belt

 

Q: What is a V-Belt?

A: A V-belt is a flexible and efficient power transmission device capable of transferring power from one shaft to another. It is known for its trapezoidal shape that wedges securely into the sheaves of a shaft. The unique shape of V-belts helps them fit tightly and snugly into the grooves of a sheave, giving them additional surface contact and increased stability. When there is belt tension, vertical forces perpendicular to the top of a V-belt push its walls against the grooves of the sheave. As the forces increase, the belt wedges tightly into the sheave grooves, which increases the friction between the surfaces of the belt and the sheave walls. The ever-growing connection allows for a higher torque to be transmitted, while the increased friction minimizes the loss of power through slippage. The multiple frictional forces allow a drive to transmit higher loads. The performance of a V-belt is determined by how tightly it fits into the groove of the sheave when placed under higher tension.

Q: What is V-Belt Geometry Terminology?

A: The cross-section of a V-belt is generally defined as a trapezium with parallel top and bottom sides. The dimensions of this trapezium can define the type of V-belt. These dimensions are necessary for matching the belt with the appropriate pulley. V-belts are also defined by other geometries, such as the location of the pitch line and the inside and outside lengths. Understanding these dimensions is necessary when selecting a V-belt to ensure the right size and dimensions are used to fit an application.
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 experiences both tensile and compressive stresses. The outer side is subjected to tension, while the inner side is under compression. The line where the stress is zero is known as the pitch line or pitch zone.
Top to Pitch: This is the length between the top side and the pitch zone.
Pitch Width: This is the width of the trapezium measured at the pitch.
Height: This is the distance between the top and bottom sides of the trapezium.
Relative Height: Relative height is a non-dimensional characteristic that is defined as the ratio of the height to pitch width.
Outside Length: This is the circumference of the belt measured along the top side.
Inside Length: This is the length of the belt measured along the bottom side.
Pitch Length: This is the length of the belt along the pitch line.
Included Angle: This is the angle made by the flanks when extended. The included angle of most v-belt sections is 40°.

Q: Why do V-belts break?

A: Misalignment, poor tensioning, and sheaves (pulleys) that are worn out are often major contributors. Design Flaws: Coming in at number two, with roughly 1/5 of all V-Belt early endings to it's credit, is design flaws.

Q: What is the recommended storage for spare V-belts?

A: Keep them clean and free of dust or any debris. Store them first in a proper box where you won't have to crimp them. Store them in a cool and dry room at constant temperature. Store them in a place with humidity between 50% to 80% (to avoid possible formation of fungus or mildew)

Q: Can V-belts be repaired?

A: While minor repairs may be possible, it's often more practical to replace a damaged V-belt for optimal performance.

Q: How do you identify V-belt wear?

A: Check for cracks, fraying, or uneven wear on the V-belt surface to identify signs of wear.

Q: What is the role of belt tensioners in V-belt systems?

A: Belt tensioners maintain proper tension in the V-belt system, ensuring optimal performance and reducing wear.

Q: Can V-belts be used for variable speed applications?

A: V-belts are generally better suited for constant speed applications. Variable speed requires specific designs or additional components. This is a raw edge cogged v-belt with a wider cross-section than classical belts. They are designed to be used with variable speed pulleys. Their section can be made into standard or non-standard sizes.

Q: Do V-belts require lubrication?

A: For multiple drive, use as many V Belts required for better service life and low maintenance cost. For best results one should use matching set belts. The whole set should be replaced if one belt fails. Belts should not be lubricated.

Q: What is the maintenance of V-belts?

A: Arguably the most important part of v-belt maintenance is ensuring that the belt's tension is optimum. A belt that is too loose is likely to slip, causing excessive wear on both the belt and pulley. Loose belts also cause a large amount of energy loss, which consequently leads to a reduction in productivity.

Q: How do you diagnose V-belt noise?

A: LOOK FOR A DRY OR CRACKED BELT
Over time, noise can often originate from a belt that has started to dry out due to age, the friction of being constantly in motion and heat from the engine itself. As this process continues, the belt is no longer able to maintain the tension required to properly grip the pulleys that it links together, and it starts to slip — producing the noise. If your belt is showing any cracks, that's a strong indication that it's dried to the point where it's at risk of snapping, which means it's time to replace it.
CHECK TO MAKE SURE COOLANT ISN'T LEAKING
Another common cause of V-belt noise is exposure to coolant. If you recently added antifreeze to your radiator and spilled some on your belt, it can quickly cause a squealing sound. The same is true if any part of your cooling system is leaking, as the engine fan can blow small amounts of coolant back onto the belt itself. Unfortunately, it's not easy to clean antifreeze from a rubber belt once it's sunk in, although some belt dressing products claim to quiet down the sound. You may be looking at a replacement to get the noise to go away.
TIGHTEN THE IDLER PULLEY
A loose belt that's slipping will squeal. If your belt looks to be in good shape and isn't dried out, then it's a good idea to check the tension on the idler pulley to make sure it's strong enough to take all the slack out of the belt as it spins. You can purchase a specific serpentine belt tool to tighten your idler pulley. It's a simple job you can do with the belt still attached to the engine.
A loud belt might be an annoyance, but a snapped belt could leave you stranded. Don't ignore what your engine is trying to tell you, and make sure to investigate why your belt is making noise as soon as you can.

Q: Can V-belts be used in high-torque applications?

A: V-belts can handle moderate torque but may not be suitable for extremely high-torque applications. V- belts are better suited for high-speed applications while timing belts are better for high torque.

Q: How do you calculate V-belt horsepower?

A: The horsepower transmitted by a V-belt can be calculated using the belt speed, tension, and pulley diameter.

Q: How do you prevent V-belt slipping?

A: Proper tensioning, alignment, and regular maintenance help prevent V-belt slipping.

Q: What is the difference between a V-belt and a serpentine belt?

A: V-belts have a trapezoidal cross-section and are used for individual components, while serpentine belts are wider, flat, and used for multiple accessories in modern vehicles.

Q: Are V-belts adjustable?

A: Yes, V-belts are adjustable to accommodate variations in pulley distance and ensure proper tension.

We're well-known as one of the leading v-belt manufacturers and suppliers in China. If you're going to buy or wholesale cheap v-belt, welcome to get free sample from our factory. All our products are with high quality and competitive price.

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