Spur gears mainly consist of a gear ring and a wheel body. The gear ring part has uniformly distributed gear slots, forming the working tooth profile (involute tooth profile), which transmits motion and power through the meshing of teeth; the wheel body part has an internal hole for installation (which may have a keyway or spline), bolt holes for connection, and process holes for balancing. The product surface is ground, with a tooth surface roughness Ra ≤ 0.8μm, ensuring smooth operation, low noise, and strong load capacity. Customization based on drawings and samples is supported, providing a one-stop solution from design, processing to inspection.
Classification
1. By tooth profile: involute gears (most common), circular arc gears
2. By accuracy grade: GB/T 10095 (ISO 1328) accuracy grades 5-9
3. By material: alloy structural steel (20CrMnTi, 42CrMo), carbon steel (45#, 50#), cast steel (ZG35Ⅱ)
4. By structure: solid gears, web gears, spoked gears
5. By application: reducer gears, working machine gears (such as rolling mill gears, crane gears)
Scope of application
1. Mechanical manufacturing: reducers, gearboxes, machine tool (lathe, milling machine) transmission systems
2. Metallurgical industry: power transmission for rolling mills, continuous casting machines, conveyor roller paths
3. Mining and lifting: walking mechanisms and hoisting mechanisms of excavators, cranes, and hoists
4. Transportation equipment: vehicle gearboxes, differential gears (customized)
5. Petrochemical and construction machinery: transmission devices for mixers, pumps, and engineering vehicles
6. Others: packaging machinery, printing machinery, food machinery, and other scenarios requiring parallel shaft transmission
Working principle
Spur gear transmission achieves motion and power transmission between parallel shafts through the successive meshing of the tooth profiles of two gears. The specific process:
1. Meshing conditions: the module (m) and pressure angle (α) of the two gears must be equal, and the tooth thickness on the pitch circle equals the slot width.
2. Transmission process: when the driving gear rotates, its tooth profile drives the tooth profile of the driven gear, maintaining continuous and uniform meshing. The transmission ratio (i) equals the ratio of the number of teeth of the two gears (i=Z₂/Z₁), achieving speed increase or reduction.
3. Load transmission: power is transmitted through the gear meshing point (node), and the tooth surface contact stress and root bending stress must be within allowable limits to ensure smooth transmission.
Spur gear model parameter table
Parameters | Common range/example values | Description |
Module (m) | 1-30mm | Standard modules (such as 2, 3, 4, 5, 8, 12, etc.) |
Pressure angle (α) | 20° (standard value) | Pressure angle of involute tooth profile |
Number of teeth (Z) | 12-300 | Selected based on transmission ratio and installation space |
Tooth width (b) | 10-500mm | Usually b ≤ 0.3m × Z (m is the module) |
Pitch circle diameter (d) | d = m × Z | Gear reference diameter |
Addendum circle diameter (da) | da = d + 2m | Addendum circle diameter |
Root circle diameter (df) | df = d - 2.5m | Root circle diameter (considering root fillet to avoid undercut) |
Center distance (a) | a = (d₁ + d₂) / 2 | Sum of the pitch circle radii of the two gears |
Accuracy grade | GB/T 10095 grades 6-7 | Affects transmission smoothness and noise |
Tooth surface hardness | 58-63 HRC (carburized layer) | Carburized layer depth 0.8-1.5mm |
Keywords
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Spur gear
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