Exceptionally Smooth and Quiet Operation: Due to their spiral tooth design, these zerol bevel gears in gearboxes engage via progressive “rolling contact” involving multiple teeth simultaneously, rather than the abrupt impact characteristic of straight-tooth gears. This results in extremely low operating noise, making them ideally suited for high-speed applications.
High Load Capacity and Strength: The spiral tooth form of zerol bevel gears in gearboxes creates a longer line of contact and a larger contact area, allowing the load to be distributed evenly. Consequently, their load-bearing capacity is approximately 20%–30% higher than that of straight bevel gears of comparable size, enabling them to withstand significant impact torque.
High Efficiency: Precision-machined spiral bevel gears typically achieve transmission efficiencies of 96%–98%, ensuring minimal energy loss.
Generation of Axial Thrust: The presence of the spiral angle generates substantial axial thrust during transmission. Therefore, in engineering designs, corresponding thrust bearings (such as angular contact ball bearings) must be incorporated to accommodate these forces.
Zerol Bevel Gears In Gearboxes
Specification
Module
1.5
Application
Gearboxes
Material
20CrMoH
Heat Treatment
HRC 58-62
Accuracy
GB/T 12368—1990
Function of Spiral Bevel Gears in Gearboxes
This is the most fundamental and core function of a spiral bevel gear. Within a gearbox—particularly in right-angle drives and reducers—it enables the input and output shafts to intersect at a right angle (typically 90°), facilitating efficient power transmission while changing the direction of rotation.
Although a spiral bevel gear does not inherently “alter the gear ratio,” it serves as a critical direction-changing and power-transmitting component within the gearbox. It is often paired with other gear types—such as spur gears or planetary gears—to form multi-stage transmission systems, achieving:
Reduced speed → Increased output torque
Or conversely: Increased speed → Reduced output torque
Compared to straight bevel gears, the progressive meshing of spiral bevel gears (involving simultaneous contact across multiple teeth) delivers:
- Extremely low operating noise
- High dynamic rigidity (superior impact resistance)
- Smooth transitions in speed and torque
Production process
6-Step Production Process
Forging
Turning
Gear Milling
Heat Treatment
ID & OD Grinding
Tooth Grinding
Forging
When gears need high performance that needs to withstand high loads, high stress, impact loads or fatigue loads, forgings are suggested to use. Forging allows metal fibers to be continuously distributed along the gear profile, significantly improving root strength and fatigue life.
Turning
This is the process of cutting and shaping solid materials into precise parts. It uses tools like lathes, mills, and drills to remove excess material. Machining transforms a simple block of metal into a finished, functional component.
Gear Milling
Gear Milling is a gear cutting process that used a rotating from cutter shaped to match the exact space between two gear teeth is plunged into the gear blank. After cutting one tooth space, the blank is indexed to the next position .
Heat Treatment
Gears need to be running with two gears or above two gears, that makes them easy to be worn-out. That’s why most types of gears need to be harden through heat treatment.
ID & OD Grinding
ID grinding, OD grinding, Surface grinding are all belonging to CNC grinding which are the foundational precision abrasive machining processes used to achieve exceptional dimensional accuracy and surface finishes, especially on hardened materials.
Tooth Grinding
Tooth Grinding are the final processes are applied after heat treatment to correct distortion, improve geometry, and achieve the final surface finish necessary for quiet, efficient power transmission.
Inspection
Strict Quality Inspection
Dimension Inspection
Material Testing
Hardness Inspection
Heat Treatment Testing
Roughness Testing
Accuracy Inspection
Meshing Testing
Dimension Inspection
Material Testing
Hardness Inspection
Heat Treatment Testing
Roughness Testing
Accuracy Inspection
Meshing Testing
Packages
Professional Packaging Safe Arrival
Customized cost-effective packages for products protection. We select multi-model solutions, combining air, sea, or land freight for the optimal balance of cost, speed, and reliability.
Inner Package
Out Package
Carton
Wooden Package
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Zero Spiral Bevel Gears
- Material: 20CrMnTiH
- Heat treatment: Carburizing HRC 58-62
- Accuracy: AGMA 10-12
Your Precision
Transmission Partner
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