Atlas Copco Gears Main Functions
Power Transmission: Transmits the power from the motor to the working components of the air compressor (such as the screw rotor, piston crankshaft), driving the compression mechanism to operate.
Speed Adjustment: Adjusts the rotational speed of the working components (such as lowering or increasing the rotor speed) through different gear combinations, matching the compression requirements.
Torque Conversion: Changes the output torque of the power to ensure appropriate driving force in different working conditions (such as startup, full-load operation).
Synchronous Operation: In double-screw air compressors (such as screw machines), the gears ensure precise meshing and synchronous rotation of the male and female rotors, avoiding interference and collision.
Common Types and Applications
According to the type of air compressor and transmission requirements, they are mainly divided into the following categories:
Cylindrical Gears
The teeth are distributed on the cylindrical surface, including straight teeth, helical teeth, and herringbone teeth, etc.
Application: Main transmission gears of screw-type air compressors (mostly helical gears, with smooth transmission and low noise), crankshaft gears of piston-type air compressors.
Characteristics: Simple structure, high transmission efficiency (up to 98% or more), suitable for parallel-axis transmission.
Conical Gears
The teeth are distributed on the conical surface, used for transmission between intersecting axes (usually 90°).
Application: Transmission systems of some mobile air compressors, used when the power transmission direction needs to be changed.
Characteristics: Can achieve vertical power transmission, but requires high manufacturing accuracy and is more costly.
Synchronous Gears
Designed specifically for double rotors (such as screw, sliding vane), ensuring that the two rotors maintain a fixed speed ratio and clearance.
Application: Air compressors without oil (as they do not rely on oil film lubrication, they need forced synchronization with gears).
Characteristics: Extremely small tooth side clearance, high material strength, requires high-precision processing to ensure meshing accuracy.
Gear Shaft
Integrated design of gears and shafts, suitable for small air compressors or low-load transmission.
Application: Transmission system of micro piston-type air compressors.
Key Parameters and Materials
Core Parameters
Module (the basic parameter of gear size, determining the承载 capacity)；
Number of teeth (affects the transmission ratio， the ratio of tooth count = inverse of rotational speed)；
Gear tooth accuracy (usually 6-8 grades， the higher the accuracy， the lower the noise and longer the lifespan)；
Contact strength and bending strength (resistance to tooth surface wear and fracture).
Common Materials
Medium carbon alloy steel (such as 40Cr， 20CrMnTi)： treated by carburizing and quenching， surface hardness high (HRC58~62)， core toughness good， suitable for main transmission gears；
Cast iron (such as HT300)： low cost， good wear resistance， suitable for low-load auxiliary gears；
Stainless steel： used in humid or corrosive environments to prevent rust and affect transmission.
Common Faults and Maintenance
Typical Faults
Gear surface wear / pitting： caused by insufficient lubricating oil， poor oil quality or excessive impurities， manifested as pits and peeling on the gear surface.
Gear fracture： caused by overload operation， material defect or installation misalignment (such as parallelism deviation of the shaft)， may be accompanied by severe abnormal noise.
Excessive tooth clearance： caused by long-term wear， will cause transmission shock， vibration and increased noise.
Adhesive damage： lubrication failure under high-speed heavy load， high-temperature adhesion of the gear surface causing metal peeling.
Address
Bainishan North Road, Dalingshan City, Dongguan City, Guangdong Province, China
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