Structural Design

• The outermost cover layer is made of rubber canvas or nylon canvas, featuring excellent wear resistance and flexibility. It protects the internal structure from external wear and contamination while enhancing the overall strength of the belt.
• The tension layer is composed of elastic rubber material. It bears tensile force during the belt’s operation, with good elasticity and fatigue resistance, which can reduce the belt’s deformation during repeated bending.
• The strength layer is the core load-bearing component of the V-belt, usually made of high-strength materials such as polyester cords, steel wires, or aramid fibers. These materials have extremely high tensile strength, enabling efficient power transmission and ensuring transmission efficiency.
• The innermost compression layer uses rubber material with high hardness. It bears compressive force when the belt contacts the pulley, and has good compression resistance and elastic recovery ability, ensuring tight fit between the belt and the pulley.

Working Principle

Types of V-Belts

• Classic V-belts: The most widely used type, classified into models Y, Z, A, B, C, D, E, etc., from smallest to largest cross-sectional size. They are suitable for medium and low-power transmission.
• Narrow V-belts: With a larger ratio of cross-sectional height to width, their load-bearing capacity is more than 30% higher than that of classic V-belts. They are suitable for high-power and high-speed transmission scenarios.
• Wide V-belts: Featuring a larger cross-sectional width, they can transmit greater power and are often used in heavy machinery transmission.
• Linked V-belts: Composed of multiple classic V-belts or narrow V-belts connected by a connecting layer, they bear force evenly during operation and avoid slipping or falling off of a single belt. They are suitable for high-power transmission systems.
• Toothed V-belts: Equipped with a toothed structure on the inner side, they can reduce bending stress and improve transmission efficiency, making them suitable for high-speed transmission.

Application Scenarios

• Industrial field: In the transmission systems of various machine tools, blowers, water pumps, and other equipment, V-belts are used to connect motors and working mechanisms, realizing power transmission and speed adjustment.
• Agricultural machinery: Equipment such as tractors, harvesters, and threshers relies on V-belt transmission to achieve coordinated operation of different components. Their wear resistance and ability to adapt to harsh environments meet the needs of agricultural production.
• Transportation field: Auxiliary systems of automobile engines (such as generators, water pumps, and air-conditioning compressors) are driven by the engine crankshaft through V-belts, ensuring the normal operation of various auxiliary equipment.
• Household appliances: Washing machines, air-conditioning outdoor units, and other household appliances also use V-belts to transmit power between motors and working components. Their stable operation and low noise characteristics improve the user experience of home appliances.

Installation and Maintenance

Installation Requirements

• Before installation, check whether the pulley groove is in good condition (free of wear, deformation, or debris) and ensure the pulley axes are parallel—otherwise, it may cause uneven wear of the belt.
• The tension of the belt should be moderate: excessive tension will increase bearing load and cause overheating of motors and equipment; insufficient tension will lead to slipping, reduce transmission efficiency, and even damage the belt.
• When installing, first fit the belt onto the small pulley, then gradually fit it onto the large pulley. Avoid forced prying to prevent belt damage.

Routine Maintenance

• Regularly check the wear of the belt: if cracks, aging, delamination, or other phenomena are found, replace the belt in a timely manner.
• Keep the belt and pulley clean to avoid oil contamination—oil will reduce the friction coefficient and cause slipping.
• Regularly check the tension and adjust it as needed.
• For systems with multiple belts, replace all belts at the same time to ensure even force bearing.

Selection of V-Belts

• Choose the appropriate belt type and model based on parameters such as transmission power, speed, and transmission ratio.
• Determine the belt length according to the pulley diameter and center distance.
• Consider factors such as the working environment temperature, humidity, and whether there is oil contamination, and select the belt of corresponding material.