Product Overview
A helical gear plate is a disk-shaped gear component with teeth arranged at a helix angle to the axis, offering advantages of large contact ratio, smooth transmission, low noise, and high load capacity compared to spur gear plates. The contact line gradually extends from the tooth end across the full face width during helical meshing, with multiple teeth in contact simultaneously for uniform load distribution. Particularly suited for medium-high speed applications with strict noise and vibration requirements, such as precision reducers, servo drive systems, EV reduction gearboxes, and quiet industrial equipment.
Yubao Transmission Technology uses CNC gear hobbing machines to produce helical gear plates with helix angles from 0–35°, normal module range 0.5–5.0mm. After worm wheel grinding, accuracy reaches DIN Grades 4–6 with tooth surface roughness Ra≤0.4μm. Precise control of axial pitch deviation (Fβ) and tooth alignment error ensures uniform contact pattern distribution across the tooth face, reducing transmission noise by 3–5dB compared to spur gear plates. Left-hand/right-hand helix configurations are available per transmission system layout requirements, with mating helical gear design services provided.
Technical Parameters
Gear Parameters
| Parameter |
Symbol |
Unit |
Value/Range |
Tolerance |
Notes |
| Outer Diameter (Tip) |
da |
mm |
50–500 |
h11 |
Tip circle diameter |
| Normal Module |
mn |
mm |
0.5–5.0 |
— |
Standard module series |
| Number of Teeth |
z |
— |
Customized |
— |
Determined by transmission ratio |
| Normal Pressure Angle |
αn |
° |
15°–30° |
— |
Typically 20° |
| Pitch Diameter |
d |
mm |
Customized |
— |
d = mn×z/cosβ |
| Helix Angle |
β |
° |
0–35° |
±0.5° |
Typically 8°–25° |
| Hand of Helix |
— |
— |
Left/Right |
— |
Must match mating gear |
| Face Width |
b |
mm |
5–200 |
±0.05 |
Must satisfy b×sinβ>mn |
| Accuracy Grade |
— |
DIN/ISO |
Grade 5 |
— |
Grinding achieves DIN 4–6 |
| Axial Pitch Deviation |
Fβ |
μm |
Per DIN standard |
± |
Key control parameter |
| Face Runout |
— |
mm |
0.02 |
≤ |
Relative to bore datum |
| Radial Runout |
— |
mm |
0.02 |
≤ |
Tip relative to bore |
Materials & Heat Treatment
| Parameter |
Symbol |
Unit |
Value/Range |
Tolerance |
Notes |
| Tooth Hardness |
HRC |
— |
58–62 |
— |
After carburizing |
| Core Hardness |
HRC |
— |
30–45 |
— |
Toughness assurance |
| Material Grade |
— |
— |
Customized |
— |
Common: 42CrMo, 20CrMnTi, 16MnCr5 |
| Heat Treatment |
— |
— |
Carburizing/Nitriding |
— |
Determined by application |
| Tooth Surface Roughness |
Ra |
μm |
0.4–0.8 |
≤ |
After grinding |
Machining Capabilities
| Process |
Equipment |
Range |
Accuracy Achieved |
| Helical Hobbing |
Ningjiang YK3610V/Chongqing SKS3112 |
Helix 0–35°, module 0.5–8mm |
DIN Grades 6–7 |
| Helical Grinding |
Qinchuan YKZ7230 Worm Wheel Grinder |
Helix 0–35°, module 0.5–3mm |
DIN Grades 4–6 |
| Heat Treatment |
Carburizing/Nitriding |
Case depth 0.5–1.5mm |
Surface HRC 58–62 |
| Gear Inspection |
Gleason 300GMS Gear Tester |
Profile/Alignment/Axial Pitch |
100% inspection |
| Geometric Inspection |
HEXAGON CMM/Mahr Roundness Tester |
Runout/Coaxiality |
0.1μm level |
Helix Angle Selection Guide
| Application |
Recommended Helix Angle |
Characteristics |
| General Reducers |
8°–15° |
Improved smoothness, controllable axial force |
| Precision Servo Transmission |
15°–25° |
Low noise, high contact ratio |
| Quiet Environment Applications |
20°–30° |
Lowest noise, bearings must handle higher axial load |
| High-Speed Transmission |
10°–20° |
Balance of smoothness and axial force |
Important Note: Helical gear transmission produces axial force Fa = Ft×tanβ. Bearing selection must account for axial load capacity. Angular contact ball bearings or tapered roller bearings are recommended.
Comparison: Spur vs. Helical Gear Plate
| Parameter |
Spur Gear Plate |
Helical Gear Plate |
| Transmission Smoothness |
Moderate |
Excellent |
| Noise Level |
Medium |
Low (3–5dB reduction) |
| Contact Ratio |
1–2 |
2–5 |
| Axial Force |
None |
Present |
| Load Capacity |
Moderate |
High |
| Machining Cost |
Lower |
Higher |
| Applicable Speed |
Medium-Low |
Medium-High |
Product Features
- Ultra-Smooth Transmission: Contact ratio of 2–5 with multiple simultaneous tooth engagements, minimal impact
- Low Noise Operation: 3–5dB noise reduction vs. equivalent accuracy spur gears, meeting quiet requirements
- High Load Capacity: Long contact lines reduce unit loading, strong anti-pitting capability
- High-Precision Manufacturing: Grinding accuracy DIN 4–6 with strict axial pitch deviation control
- Reversible Rotation: Left-hand/right-hand helix customizable for different transmission layouts
Typical Applications
| Application Sector |
Specific Use |
Typical Parameters |
| Precision Reducers |
Planetary reducer internal ring/sun gear |
Module 1–3mm, helix 15°–20°, DIN 5 |
| Electric Vehicles |
E-drive main reducer gears |
Module 1.5–3mm, helix 20°–25° |
| Industrial Automation |
Servo motor配套 gear plates |
Module 0.5–2mm, helix 15°, DIN 4–5 |
| Quiet Equipment |
Medical/office equipment transmission |
Module 0.5–1.5mm, large helix for low noise |
| Machine Tools |
High-precision spindle transmission |
Module 1.5–3mm, helix 12°–18°, DIN 4 |
