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Cylindrical Gear

Cylindrical gear is a type of gear whose teeth are distributed on the surface of a cylinder. Such as spur gear,helcial gear and herringbone gear. It is one of the most widely used gear types in mechanical transmission.

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Description

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Definition

Cylindrical gear is a type of gear whose teeth are distributed on the surface of a cylinder. It has the characteristics of smooth power transmission, high efficiency, and compact structure. It is often used in various mechanical transmission devices, such as automobile transmissions, industrial reducers, etc., and can realize the transmission and transformation of different speeds and torques.

Material

Carbon steel: such as 45 steel, has high strength and hardness, good wear resistance, and can meet the requirements of general mechanical transmission after proper heat treatment. It is often used in some occasions where the requirements for precision and performance are not particularly high, such as ordinary reducers, conveyors, etc.

Alloy steel: such as 20CrMnTi, 40Cr, etc. Alloy steel has higher strength, toughness and wear resistance, can withstand large loads and impacts, and is suitable for high-speed and heavy-load transmission occasions, such as automobile transmissions, aircraft engine transmission systems, etc.

Cylindrical gear details

cylindrical gear 1 3

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Machining processing

cylindrical gear 1 2

Blank manufacturing: According to the material and size requirements of the gear, select the appropriate blank manufacturing method, such as forging, casting or welding. Forged blanks have better internal organization and mechanical properties, and are suitable for gears that bear larger loads; cast blanks are suitable for gears with complex shapes and large batches; welded blanks are generally used for the manufacture of large gears.

Gear blank processing: Turning, grinding and other processing are performed on the blank to obtain the size and shape of the gear blank that meets the precision requirements, including processing the inner hole, outer circle, end face and other reference surfaces of the gear, providing accurate positioning reference for subsequent gear processing.

Tooth processing: This is the key process of cylindrical gear processing. Common methods include milling, hobbing, shaping, shaving, grinding, etc. Milling, hobbing and shaping are commonly used tooth rough processing methods, which can efficiently process gears of various modules and numbers of teeth; milling and shaving are mainly used to improve the tooth profile accuracy and surface quality of gears, and are suitable for medium-precision gear processing; grinding is the main method for high-precision gear processing, which can obtain very high tooth profile accuracy and surface finish, but the processing cost is high, and it is often used in occasions with extremely high transmission accuracy requirements.

Heat treatment: According to the use requirements and performance characteristics of the gear, the processed gear is appropriately heat treated, such as quenching, tempering, carburizing, nitriding, etc., to improve the strength, hardness, wear resistance and fatigue resistance of the gear.

Surface treatment: In order to improve the corrosion resistance, wear resistance and aesthetics of the gears, the gears can be surface treated, such as hard chrome plating, zinc plating, blackening, etc.

Finishing: The gears that have been heat treated and surface treated are finished, such as grinding, honing, etc., to further improve the accuracy and surface quality of the gears and meet the use requirements of the gears.

Assembly and debugging: Assemble the processed gears with other parts to form a complete transmission device, and debug and inspect them to ensure the stability, accuracy and reliability of the gear transmission.

Inspection steps

Tooth profile accuracy detection: Use precision measuring instruments such as gear measuring centers and universal tool microscopes to measure the gear's tooth profile, tooth direction, tooth pitch and other parameters to evaluate whether the gear's tooth profile accuracy meets the design requirements.

Dimensional accuracy detection: Use calipers, micrometers, three-coordinate measuring machines and other measuring tools to measure the outer diameter, inner diameter, tooth width, keyway and other dimensional parameters of the gear to ensure that its dimensional deviation is within the specified tolerance range.

Surface quality inspection: Through visual inspection, roughness measuring instrument and other means, the surface roughness and surface defects of the gear are inspected, such as cracks, sand holes, pores, knife marks, etc., to ensure the good surface quality of the gear and avoid early failure of the gear during use due to surface defects.

Hardness test: Use a hardness tester to test the hardness of different parts of the gear to check whether the hardness of the gear meets the requirements after heat treatment to ensure that the gear has sufficient strength and wear resistance.

Assembly quality inspection: After the gear is assembled, check the assembly accuracy of the gear and the shaft, bearing, housing and other parts, such as whether the gear installation eccentricity, axial movement, meshing clearance, etc. meet the requirements, and check the stability and noise of the gear transmission to ensure that the gear transmission system can operate normally.

Application fields

Industrial transmission: In various industrial equipment, such as fans, water pumps, compressors, etc., cylindrical gears are used to transmit power and change speed to meet the working requirements of different equipment.

Automobile manufacturing: Cylindrical gears are widely used in automobile transmissions, differentials and other components to achieve speed changes and power distribution under different driving conditions.

Aerospace: The transmission system of aircraft engines and the landing gear retraction and extension mechanism of aircraft are inseparable from cylindrical gears. Their high reliability and high precision are the key to ensuring flight safety and performance.