Drive Belt Inspection, Replacement

The ASE G1 Certification test contains 55 scored questions, plus 10 unscored ­research questions, that cover a range of skills and knowledge related to maintenance and light repairs in engine systems, automatic transmission/transaxle, manual drivetrain and axles, suspension and steering, brakes, electrical, and heating and air conditioning.

Mileage is a big factor in drive belt wear, but so is general age, regardless of use. Modern drive belts, made of the durable synthetic rubber known as ethylene propylene diene monomer (EPDM), last much longer than older neoprene drive belts, but they do still get old, wear down and lose performance.

Neoprene drive belts should be replaced if there are three cracks in a three-inch section, but EPDM drive belts resist cracking because of their increased elasticity. This is why a visual check for cracks isn’t the best indicator of true drive belt wear. EPDM drive belts can run 100,000 miles or beyond with no visual cracks. A far better indicator of wear on EPDM drive belts is material loss. Serpentine drive belt drives are exposed to grit, rocks, salt and water, and, over time, these contaminants along with slight misalignments result in wear of the rubber rib surface.

A drive belt is like a tire in that over time its tread will wear down, which will reduce its performance. As a drive belt’s ribs start to wear and flatten, a drive belt starts to lose its ability to grip or function properly, causing it to slip, which puts a strain on other components within the engine. As little as 5% rib material loss and surface wear can affect how the drive belt performs, and just 10% drive belt slippage can affect the overall driveability of a vehicle.

In terms of vehicle performance, a persistent check engine light, reduced engine cooling, inconsistent power steering performance or poor A/C system performance are all signs of drive belt slip caused by wear.

This article comes from tirereview edit released

What are the sizes of V belts?

Classical v belt:

Conventional v belt is the most common v belt type and has been around the longest. The Initial classical V design replaced leather belts by taking over their applications in a wide range of industries, such as agriculture, ventilation, and industrial machinery. Classical v belts are capable of covering a load range from fractional(less than 1 HP) to 500 horsepower. They are less efficient than narrow v belt and generally contribute to higher bearing loads. However, classical v belts have high tolerance for poor operating conditions.

The general part number format is the cross section size and the inside length in inches ( e.g. B50 is a B section of 50 inches inside length ).

General cross sectional dimensions that are used in the US are shown below.


Narrow V series:

Narrow belts are optimum for load transfer and force distribution because of their greater depth to width ratio. That’s their advantage over classical V belts. Narrow belts are also suitable for drives with high belt speeds, again, for their powerfully compact size. Narrow belts have the ability to transmit up to three times the horsepower of classical v belt in the same drive space. They can handle drives from 1 to 1000 horsepower.

Part number designation for wedge belts are shown in terms of belt top width followed by nominal outside length in inches. The numerical prefix indicates the belt top width in one eighth of an inch. For example 5V500 part number indicates 5/8” top width with 50.0” outside length.

General cross sectional dimensions that are used in the US are shown below.


Fractional Horsepower Belt:

FHP light duty v belts are used most often as single belt on drives of 1 horsepower or less. Its design is for relatively light loads. The common applications for this v belt type are domestic washing machines, small fans, refrigerators, and garage equipment. Light v belts should never be used on any heavy-duty industrial applications, even if they seem to fit the classical or narrow v belt pulley grooves.

Part number designation for FHP belts are similar to wedge. They are identified with a 2L, 3L, 4L or 5L prefix. The numerical prefix indicates the belt top width in one eighth of an inch followed by nominal outside length in inches. For example 3L300 part number indicates 3/8” top width with 30.0” outside length.

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Industrial Cogged V Belt Identification Chart

All cogged v belts are identified in a similar manner, in either English or metric units. Cogged v belts are identified by:

1. Pitch: Distance in inches or millimeters between two adjacent tooth centers as measured on the cogged v belt pitch line.

2. Pitch Length: Total length (circumference) in inches or millimeters as measured along the pitch line. It is equal to the pitch multiplied by the number of teeth in the cogged v belt.

3. Width: Always shown as the last part of the size designation. Denotes width in inches or millimeters.

This article comes from filtechinc edit released

Timing power transmission belt

Premium rubber timing belt guarantees extreme dimensional stability under static and dynamic tension, coupled with a superior flex fatigue resistance, thanks to the development of its innovative “Dual Core” hybrid cord technology. We reache the highest level of performance incorporating this cord in a new rubber matrix and teeth coated with a special and unique heavy duty fabric.


01 / BODY

An innovative design and blend of HNBR elastomers, uniquely cross-linked to increase teeth rigidity and shear resistance, up to +25% in comparison to GOLD belts. Despite the high levels of rigidity and hardness, this compound guarantees an exceptional resistance to flex fatigue, preventing the appearance of cracks when working with very small pulleys.

02 / CORD

The tensile member is made out of the innovative “Dual Core” hybrid cord technology and it constitutes the load carrying elements inside the New timing belt.

03 / COVER

A hard-wearing polyamide fabric is bonded to the tooth surface, to improve torque carrying capacity and tooth shear resistance. Its special surface impregnation process confers self-lubricating properties, a lower friction and increased drive efficiency.

This article comes from directindustry edit released

V belt selection it’s a veritable cinch

V belts are friction-based torque transmitters that derive their name from the cross section trapezoidal outlook. The belts were designed to help solve the problems misalignment and slippage found in the common flat and round belts. The belts provide one of the best combinations of speed of movement and traction in industrial settings.

The v belts are designed from three core components. One, they have endless steel wires that help to provide enforcement and strength when transmitting torque. The belt also includes a rubber compound that surrounds the wires and takes the characteristic V-shape. The rubber compound also serves as a compression medium to absorb shock. The last component used to make v belts is a protective cover. This layer is made of plastic and helps to enhance the belt’s endurance against high temperatures during movements. Note that even with the protection, it is important to ensure that your motor and operating environment are at the right temperatures to increase the efficiency of the belt.

V belts are classified into five sections that (sections); A, B, C, D, and E. This grouping is based on the cross-sectional size and the power that can be transmitted by the belt. Here is a closer look at these dimensions. Section ‘A’ Type – 0.1 kW to 3 kW, Section ‘B’ Type – 0.5 kW to 6 kW, Section ‘C’ Type – 1 kW to 12 kW, Section ‘D’ Type – 3 kW to 32 kW, Section ‘E’ Type – 5 kW to 50 kW. The above values point at the capacity of a single belt. Therefore, if you want to achieve higher torque rates, you can simply use more belts. Note that if your device is designed to only use one V-belt, you might need to seek expert assistance to make appropriate modifications before additional belts can be used.

This article comes from mrosupply edit released