The splined gear shaft is an integrated design composed of a "gear section" and a "spline section":
- Gear section: Machined with standard involute tooth profiles (module, pressure angle, and number of teeth customizable), achieving speed reduction, speed increase, or change of motion direction through gear meshing.
- Spline section: Machined with high-precision splines (such as rectangular splines or involute splines), mating with the corresponding splined hub to achieve axial fixation and torque transmission, allowing some axial displacement and angular compensation.
- Manufacturing process: Forged steel blank → CNC precision machining (gear tooth profile, spline tooth profile, shaft journal) → Heat treatment (carburizing and quenching or quenching and tempering to improve surface hardness and wear resistance) → Precision grinding of tooth profile/spline → Quality inspection (tooth profile accuracy, spline fit tolerance).
- Features: Integrated design reduces the number of parts and improves transmission efficiency; gear and spline work collaboratively with high load capacity; module, number of teeth, spline parameters, etc., can be customized according to working conditions.
Product Classification
1. By spline type
- Rectangular spline gear shaft (high precision, large torque transmission)
- Involute spline gear shaft (smooth meshing, low stress concentration)
2. By gear type:
- Straight-tooth splined gear shaft (simple transmission, easy to machine)
- Helical-tooth splined gear shaft (smooth transmission, low noise)
- Herringbone splined gear shaft (high load capacity, suitable for heavy loads)
3. By material:
- Alloy steel splined gear shaft (42CrMo, 35CrMo, etc., high strength)
- Stainless steel splined gear shaft (corrosion resistant, used in special environments)
4. By application:
- Automotive transmission splined gear shaft
- Industrial reducer splined gear shaft
- Construction machinery drive splined gear shaft
Scope of Application
1. Automotive industry: transmission input shaft, output shaft, differential gear shaft.
2. Industrial machinery: reducers, lifting equipment, conveyor machinery, metallurgical equipment (such as shafts arranged in rows in the picture, possibly used for metallurgical rolling mills).
3. Construction machinery: drive axle gear shafts for excavators, cranes, loaders.
4. Energy machinery: wind power gearboxes, petroleum drilling equipment drive shafts.
5. Special scenarios: high-precision machine tool spindles (helical spline gear shafts), high-frequency vibration equipment (requiring high rigidity spline design).
Working Principle
1. Gear transmission: The torque from the motor or prime mover is transmitted to the gear section of the splined gear shaft through gear meshing, driving the shaft to rotate; speed reduction or increase is achieved through the gear tooth ratio.
2. Spline connection: The spline section mates with the corresponding splined hub (such as bearing housing, coupling), transmitting torque from the shaft to the hub while allowing slight axial displacement and angular compensation between the shaft and hub.
3. Collaborative operation: The gear section is responsible for motion and power transmission, the spline section for torque transmission and axial positioning; together they complete complex transmission tasks (such as the shaft in the picture mating with a bearing, where the spline section supports the bearing inner ring and the gear section transmits power).
Splined Gear Shaft Model Parameter Table
Parameters |
Model A (Straight-tooth spline shaft) |
Model B (Helical spline shaft) |
Model C (Heavy-duty spline shaft) |
Pitch circle diameter |
φ100mm-φ300mm |
φ150mm-φ400mm |
φ300mm-φ600mm |
Module (m) |
4-12 |
6-20 |
10-30 |
Pressure angle (α) |
20° (standard value) |
20° |
20° or 25° |
Number of teeth (z) |
20-60 |
30-80 |
40-120 |
Spline type |
Rectangular spline (DIN 6345) |
Involute spline (GB/T 3478) |
Rectangular spline (heavy-duty type) |
Number of spline teeth |
6-24 |
8-32 |
12-48 |
Shaft diameter (d) |
φ30mm-φ150mm |
φ50mm-φ200mm |
φ100mm-φ300mm |
Material |
42CrMo (quenched and tempered) |
20CrMo (carburized and quenched) |
38CrMoAl (Carburizing and Quenching) |
Hardness |
Tooth surface 42-48 HRC, Spline 40-45 HRC |
Tooth surface 58-62 HRC, Spline 50-55 HRC |
Tooth surface 55-60 HRC, Spline 48-52 HRC |
Application Scenarios |
Medium and Light Load Mechanical Transmission |
Medium and Heavy Load Smooth Transmission |
Large Heavy Load Equipment Transmission |
Keywords
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Spline gear shaft
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