The circular arc bevel gear adopts a conical structure design, with teeth distributed in a helical line, enabling transmission between two intersecting axes (usually 90°). Core features include:
- Materials: Commonly used 20CrMnTi carburized steel (carburizing and quenching treatment), 42CrMo alloy steel, stainless steel, or bronze (for special conditions), ensuring high wear resistance and impact resistance.
- Manufacturing process: Forged blank → CNC machining → Heat treatment (carburizing/quenching) → Gear grinding finishing (surface roughness Ra0.6), accuracy up to grade 6 (GB/T 10095).
- Structure: Includes hub, gear ring, and bore, some with keyways or bolt holes for easy installation.
- Performance: High speed and low noise (noise reduced by 10-15dB), strong load capacity, transmission efficiency over 98%, suitable for heavy load and high-speed conditions.
Classification
1. Product category: Mechanical transmission components > Gears > Bevel gears > Spiral bevel gears.
2. Subcategories:
- By module: small module (≤5mm), large module (>10mm);
- By accuracy: high-precision gears (accuracy grade 6 and above), ordinary precision gears;
Scope of application
Heavy industry machinery: mining crushers (such as cone crushers, rotary crushers), cement plant ball mills, mining excavator transmission systems.
Construction machinery: ship propellers, oil drilling rigs, water well drilling rigs, industrial cranes.
Vehicle components: automotive differentials, locomotive transmission devices, tractor rear axle gears.
General equipment: reducers, gearboxes, industrial robot joint transmissions.
Working principle
When two intersecting shafts need to transmit power, the circular arc bevel gear achieves motion transmission through the progressive meshing of helical teeth:
- Meshing process: The helical teeth of the pinion (driving gear) gradually contact the tooth surface of the large gear (driven gear) along the helical line, forming a dynamic process of point contact → line contact → point contact, reducing impact.
- Motion transmission: When the driving gear rotates, it drives the driven gear through sliding friction of the helical teeth, changing the direction of motion (e.g., vertical turning).
- Advantages: The helical tooth design makes transmission smoother, suitable for high-speed and heavy-load scenarios; however, special lubrication (such as oil-based cutting oil) is required to reduce wear.
Circular arc bevel gear model parameter table
Parameters |
Model example 1 |
Model example 2 |
Description |
Module (m) |
8mm |
12mm |
Selected based on torque; large module is suitable for heavy load. |
Pressure angle (α) |
20° |
25° |
Common values affecting tooth profile strength. |
Number of teeth (z) |
Pinion: 20 teeth. |
Large gear: 60 teeth. |
Speed ratio = number of teeth on large gear / number of teeth on pinion. |
Diameter (D) |
Pinion: φ200mm. |
Large gear: φ600mm. |
Calculated based on module and number of teeth. |
Material |
20CrMnTi carburized steel. |
42CrMo alloy steel. |
Carburized layer depth 0.8-1.5mm. |
Heat treatment |
Carburizing and quenching. |
Tempering treatment. |
Hardness HRC58-62 (tooth surface). |
Accuracy grade. |
Grade 6 (GB/T 10095). |
Grade 7. |
Surface roughness Ra0.6-1.6μm. |
Applicable conditions. |
Crusher transmission. |
Cement mill gears. |
Temperature -20℃~200℃, speed ≤3000rpm. |
By application: crusher gears, cement mill gears, vehicle differential gears, industrial equipment gears.
Keywords
Previous: Spline gear shaft
Next： Spur gear
Arc bevel gear
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