Product Overview
A flange plate gear is a composite transmission component integrating a gear disk with a flange structure. The flange provides a convenient mounting and positioning interface, enabling direct bolted connection to mating components without additional adapter sleeves or couplings. The flange plate gear integrates transmission, positioning, and connection functions in one piece, significantly simplifying assembly procedures while improving system coaxiality and connection rigidity. Widely used at reducer output ends, motor connection ends, hydraulic pump interfaces, and other applications requiring high installation accuracy and connection reliability.
Yubao Transmission Technology produces flange plate gears using forged blanks + CNC turning + gear hobbing/grinding processes. Flange register-to-gear bore coaxiality ≤0.02mm, flange face roughness Ra≤0.8μm (sealing surface), and bolt hole positional tolerance ≤0.05mm. Flange outer diameter, register diameter, bolt circle (PCD), and bolt specifications are all customizable per customer requirements. Common flange connection dimensions conform to ISO and DIN standards, with custom specifications available upon request.
Technical Parameters
Gear Parameters
| Parameter |
Symbol |
Unit |
Value/Range |
Tolerance |
Notes |
| Outer Diameter (Tip) |
da |
mm |
50–400 |
h11 |
Tip circle diameter |
| Module |
m |
mm |
0.5–5.0 |
— |
Straight or helical |
| Number of Teeth |
z |
— |
Customized |
— |
Determined by transmission ratio |
| Pressure Angle |
α |
° |
15°–30° |
— |
Typically 20° |
| Face Width |
b |
mm |
5–150 |
±0.05 |
Working face width |
| Accuracy Grade |
— |
DIN/ISO |
Grade 5 |
— |
Achievable: DIN Grade 5 |
| Face Runout |
— |
mm |
0.02 |
≤ |
Relative to bore datum |
| Radial Runout |
— |
mm |
0.02 |
≤ |
Tip relative to bore |
Flange Structure Parameters
| Parameter |
Symbol |
Unit |
Value/Range |
Tolerance |
Notes |
| Flange Outer Diameter |
Df |
mm |
Customized |
±0.05 |
Mounting datum outer diameter |
| Flange Thickness |
tf |
mm |
Customized |
±0.05 |
Flange face thickness |
| Journal Diameter |
d |
mm |
Customized |
±0.02 |
Mating shaft diameter |
| Register Diameter |
Ds |
mm |
Customized |
h6/js6 |
Positioning register |
| Bolt Circle (PCD) |
D1 |
mm |
Customized |
±0.05 |
PCD |
| Number of Bolt Holes |
n |
— |
Customized |
— |
Common: 4, 6, 8 holes |
| Bolt Specification |
— |
— |
Customized |
— |
E.g., M8×1.25, M10×1.5 |
| Flange Face Roughness |
Ra |
μm |
0.8 |
≤ |
Sealing surface requirement |
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 |
— |
— |
Tempering/Carburizing/Nitriding |
— |
Determined by application |
Machining Capabilities
| Process |
Equipment |
Range |
Accuracy Achieved |
| Blank Forming |
Forging/Round Bar Cutting |
φ50–400mm |
Proper fiber flow direction |
| CNC Turning |
HEADMAN/DOOSAN CNC Lathe |
Flange + Gear integrated machining |
Register h6 grade |
| Gear Hobbing/Grinding |
Ningjiang/Qinchuan Equipment |
Module 0.5–8mm |
DIN Grades 5–6 |
| Drilling/Tapping |
Machining Center/Drill-Tap Center |
Flange bolt holes |
Positional tolerance ≤0.05mm |
| Heat Treatment |
Carburizing/Tempering |
Case depth 0.5–1.5mm |
HRC 58–62 |
| Inspection |
CMM/Axis Tester |
Full dimensional inspection |
100% verification |
Flange Types
Raised Face (RF)
- Features: Flange face slightly raised above bolt circle, raised sealing surface
- Applications: General pressure applications with non-metallic gaskets
- Standards: DIN 2501, ISO 7005
Male-Female (MFM)
- Features: Flange faces with male-female register fit, high positioning accuracy
- Applications: High pressure or precision alignment requirements
- Advantage: Self-centering, shear resistant
Register-Positioned Flange
- Features: With precision register (h6/js6 fit)
- Applications: High-precision transmission connections, e.g., reducer output flanges
- Advantage: Register automatic centering, excellent coaxiality
Product Features
- Integrated Design: Gear and flange manufactured as one piece, no connection clearance, high rigidity
- Easy Installation: Direct bolted flange connection, eliminates couplings, high assembly efficiency
- Precise Positioning: Register fit h6/js6, installation coaxiality ≤0.02mm
- Reliable Sealing: Flange face roughness Ra≤0.8μm, reliable sealing with gasket
- Reliable Strength: Forged blank + full-tooth hardening, high flange strength, fatigue resistant
Typical Applications
| Application Sector |
Specific Use |
Flange Characteristics |
| Reducers |
Output flange gear |
Register positioning, direct load connection |
| Hydraulic Systems |
Hydraulic pump drive gear |
Flange connection to motor or engine |
| Construction Machinery |
Slewing drive gear |
Large flange, multiple bolts (8–12 holes) |
| Wind Energy |
Yaw/pitch drive gear |
Large diameter flange, high strength |
| Automation Equipment |
Servo transmission flange gear |
Small precision flange, 4–6 holes |
