PAES 301-302.docx

PAES 301:2000 Engineering Materials -- V-belts and Pulleys for Agricultural Machines -- Specifications and Applications 1. V-belt: A flexible machine element used to transmit motion and power between two shafts, with a cross-section shaped roughly like a regular trapezoid. 2. V-pulley: A...

PAES 301:2000 Engineering Materials -- V-belts and Pulleys for Agricultural Machines -- Specifications and Applications 1. V-belt: A flexible machine element used to transmit motion and power between two shafts, with a cross-section shaped roughly like a regular trapezoid. 2. V-pulley: A wheel with one or more grooved rims used to transmit motion and power by means of one or more V-belts. The cross-section of the grooved rim is in the shape of an open-channel outlined by the base and the two slanted sides. 3. V-belt drive: A power transmission device that consists of one or more V-belts mounted on two or more V-pulleys. 4. Pulley diameter: The outside diameter of the pulley. 5. Pulley pitch diameter: The diameter of the pulley that coincides with the belt pitch. 6. Belt pitch: The region in the belt that keeps the same length when the belt is bent perpendicularly to its base. 7. Belt length: The length of the belt at the level of its pitch. 8. Speed ratio: The ratio of the angular velocities of the pulleys, making no allowance for slip and creep. 9. Belt speed: The linear speed of the belt at the level of the pulley pitch diameter. PAES 302:2000 Engineering Materials -- Flat Belts and Pulleys for Agricultural Machines -- Specifications and Applications 1. Flat Belts: A type of belt used in power transmission drives, characterized by a flat surface that transmits power between pulleys. 2. Pulleys: Wheels with a grooved rim around which a flat belt runs to transmit power from one shaft to another. 3. Solid Pulley: A pulley that is constructed in one piece, without a split or joint. 4. Split Pulley: A pulley that is constructed in two pieces, with a split or joint, allowing it to be opened and closed for installation or removal. 5. Crown Pulley: A pulley with a slightly convex or crowned external peripheral face to help keep the belt centered. 6. Level Pulley: A pulley with a flat external peripheral face. 7. Rubber Belting: A type of flat belt made from fabric or cord impregnated and bound together by vulcanized rubber compounds, known for its high tensile strength and resistance to moisture. 8. Power Rating: The amount of power a belt can transmit per millimeter of its width, typically expressed in watts per millimeter. 9. Ply: The number of layers of material in a belt, contributing to its strength and durability. 10. Belt Speed: The linear speed at which the belt travels around the pulleys, usually measured in meters per second. 11. Arc of Contact: The portion of the belt that is in contact with the pulley, measured in degrees. 12. Belt Length: The total length of the belt, including the tangents and connecting arcs around the pulleys. 13. Effective Diameter: The diameter of the pulley that is in effective contact with the belt, used in calculating belt length and other drive parameters. 14. Crossed Belt Drive: A drive configuration where the belt runs across the pulleys in a crisscross pattern. 15. Nylon Cord Belts: A type of flat belt constructed with nylon cords, providing strength and flexibility. 16. Keyways: Grooves cut into the sides of a shaft or hub to accommodate a key, ensuring a secure fit and transmission of torque. 17. Bearing Loads: The forces exerted on the bearings by the rotating pulleys and the belt tension. 18. Belt Cross-Sections: The profile or shape of the belt, which can vary in thickness and width to accommodate different power transmission requirements. 19. Enclosing the Drive: The practice of covering the drive mechanism to prevent accidental contact and to keep foreign materials away from the moving parts. 20. Drive Inspection: The periodic examination of the drive system to check for proper belt tension, the condition of keys and setscrews, and the overall state of the belt. 21. Proper Markings: The presence of necessary information such as size, type, and manufacturer\'s details on the belt and pulley for identification and maintenance purposes.