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Home / Product Range / Industrial Gears / 45# Steel Helical Gears / Mn3 15° Z30 40Cr Precision Helical Gear, for High-Speed Fans and Elevator Traction Machines
  • Mn3 15° Z30 40Cr Precision Helical Gear, for High-Speed Fans and Elevator Traction Machines
  • Mn3 15° Z30 40Cr Precision Helical Gear, for High-Speed Fans and Elevator Traction Machines
45# Steel Helical Gears

Mn3 15° Z30 40Cr Precision Helical Gear, for High-Speed Fans and Elevator Traction Machines

The Mn3 β15° Z30 helical gear is designed for parallel-shaft high-speed, heavy-load, low-noise conditions. The 15° helix angle combined with quenched and tempered 40Cr material surpasses a spur gear of the same size in both load capacity and running smoothness.

Item Specification
Normal module 3
Number of teeth 30
Helix angle 15°
Normal pressure angle 20°
Material 40Cr, quenched and tempered
Pitch circle diameter 93.17mm
Transmission ratio 1:1~6:1
Pitch line velocity ≤40m/s
Transmission efficiency 97%~99%
Machining Gear hobbing, gear grinding; carburizing and quenching available

Key Product Advantages Key Selling Points Applications and Scenarios Contact Us

1. Progressive meshing, heavy load with low noise: The 15° helix angle makes the teeth engage and disengage gradually. Compared with the instant impact of a spur gear, the helical gear has a larger contact ratio, significantly higher load capacity, and much lower running noise.
2. Suited to high pitch line velocity: Allows pitch line velocities up to 40m/s with efficiency of 97%~99%. It fits high-speed equipment very well and runs extremely smoothly.
3. High strength, fatigue-resistant: Made of 40Cr, quenched and tempered, giving a perfect balance of tooth-surface hardness and core toughness. Combined with gear grinding (carburizing and quenching optional), it significantly improves pitting and bending fatigue resistance and is up to long heavy-load operation.
4. Controllable axial force: The axial force produced by the 15° helix angle is moderate, and can be handled easily by pairing it with angular contact ball bearings or tapered roller bearings at assembly, a perfect compromise between performance and structural cost.

An upgrade that "trades a small structural cost for high load capacity and quiet running": In heavy-load, high-speed equipment where spur gears cannot be used, it replaces more complex gears with larger helix angles and lowers purchasing cost.
Long life, less downtime: Precision hobbing/grinding ensures very low tooth-surface roughness and very slow wear, making it suitable as a core transmission part in high-end reducers and fans.

Heavy-duty and high-speed transmission: Heavy-duty reducers, industrial gearboxes, and elevator traction machines.
Fluid machinery: Gearboxes of large fans, air compressors, and high-pressure pumps.
Heavy industrial equipment: Power distribution boxes of mining and construction machinery (note: pair with angular contact bearings).

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About Rentai
Transmission Equipment

Shanghai Rentai Transmission Equipment Co., Ltd. is a manufacturer specializing in R&D, production and export of mechanical transmission components. Our main products include taper lock pulleys, taper lock bushes, timing pulleys, V-belts and timing belts. We also provide OEM & ODM custom service for non-standard transmission parts. Our factory covers over 8000 square meters, with more than 100 employees including 22 technical staff. We integrate casting, machining and finishing, equipped with CNC machines and testing instruments, with an annual casting output of 2000 tons. Supported by complete quality management system and international standards, our products are exported to Southeast Asia, Middle East, Europe and America, delivering reliable transmission solutions for global industrial clients.

  • 10+

    Industry Experience

  • 100+

    Production staff

  • 2000+Ton

    Annual Production

  • 8000+㎡

    Factory Area

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