Luoyang Yujie Industry&Trade Co., Ltd is one of the most experienced manufacturers and suppliers of large gear wheel in China. Please feel free to buy cheap large gear wheel for sale here from our factory. All customized products are with high quality and competitive price.

 

 

 

 

A large gear wheel, also known simply as a large gear or gearwheel, is a mechanical component that plays a crucial role in many machines and mechanisms. Gears are toothed wheels that mesh with one another to transmit motion and power from one rotating shaft to another. Large gear wheels come in various types, including spur gears, helical gears, bevel gears, and worm gears, each with its own specific design and applications. They are essential components in a wide range of mechanical systems, enabling the controlled and efficient transfer of power and motion.

 

 

 

Parameter	Description
Gear Type	Large Helical Gear / Spur Gear / herringbone gear
Application	Mining machinery, gearboxes, crushers, ball mills, and heavy-duty transmission systems
Module	m=8–40, customized according to load requirements
Number of Teeth	20–200 teeth, designed according to transmission ratio
Pressure Angle	20° standard, customized options available
Helix Angle	8°–30° for helical gears
Face Width	100–800 mm, customized based on load capacity
Pitch Diameter	Designed according to module and number of teeth
Outside Diameter	Customized according to equipment requirements
Bore Diameter	Customized according to shaft connection design
Material	42CrMo, 34CrNiMo6, 18CrNiMo7-6 alloy steel
Heat Treatment	Quenching and Tempering / Carburizing / Nitriding
Hardness Requirement	HB280–350 for tempered gears; HRC55–60 for carburized tooth surfaces
Accuracy Grade	ISO Grade 7–9 according to application requirements
Gear Weight	From hundreds of kilograms to several tons
Quantity	Single piece production or small batch orders
Drawing Available	Customer drawings accepted or customized design available based on operating conditions
Delivery Requirement	Material certificate, inspection report, heat treatment report, and export packaging available

 

 

 

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Gear blank processing:

 

Turning or milling the gear blank to process the reference surfaces such as the shaft hole and the end face to ensure coaxiality and verticality, laying the foundation for subsequent tooth processing.

 

Tooth processing:

 

Gear hobbing/gear shaping: Cutting with a hob or gear shaping cutter is suitable for spur and helical gears, with high efficiency and medium accuracy (8-7 levels).

Gear milling: Processing with a forming milling cutter is suitable for single-piece small batch or low-precision gears.

Gear grinding: Grinding high-precision gears (above level 6) eliminates heat treatment deformation and improves tooth surface finish and accuracy.

 

Heat treatment:

 

Carburized steel (such as 20CrMnTi) needs carburizing and quenching to improve the hardness of the tooth surface (HRC58-62); quenched and tempered steel (such as 42CrMo) is quenched and tempered to optimize the comprehensive mechanical properties.

Surface treatment:

Hard chrome plating, nitriding and other processes enhance wear resistance, or shot peening improves fatigue resistance.

 

 

Dimension and geometric tolerance:

 

Use a three-coordinate measuring instrument or CNC machine tool to detect the diameter of the tooth top circle, the diameter of the tooth root circle, the coaxiality of the shaft hole, the end face runout, etc. to ensure that it meets the design requirements.

 

Tooth shape and tooth direction accuracy:

 

Use a gear measuring center or a hob inspection instrument to measure the tooth profile deviation and helix deviation to ensure meshing stability.

 

Hardness detection:

 

The Rockwell hardness tester detects the hardness of the tooth surface, and the ultrasonic thickness gauge assists in confirming the depth of the carburized layer.

 

Non-destructive testing:

 

Magnetic particle or ultrasonic testing is used to check whether there are cracks, slag inclusions and other defects on the tooth surface and inside to ensure safe operation.

 

 

Industrial Machinery: Large gears are common in heavy machinery such as cranes, excavators, and conveyor systems, where they help transfer power and control the motion of heavy loads.

 

Wind Turbines: Large gears are essential components in wind turbines, where they convert the slow rotational speed of the turbine blades into high-speed rotation for electricity generation.

 

Marine Applications: In ships and boats, large gears are used in propulsion systems, steering mechanisms, and winches.

 

Mining Equipment: Mining machinery relies on large gears to power crushers, conveyors, and other equipment used in the extraction and processing of minerals.

 

Steel Mills: Large gears are critical in steel mills to drive rolling mills and other heavy-duty equipment used in metal production.

 

Energy Generation: Gears can be found in power generation equipment such as hydroelectric generators, where they transmit power from the water turbine to the generator.

 

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