Heavy Duty Forged Shaft with Gear / Gear Shaft for Cement Ball Mill Rotary Kiln
Product Description
Shaft with Gear (also called Gear Shaft / Pinion Shaft) is a high-precision, heavy-duty integral transmission component, widely used in large rotary equipment such as cement ball mills, rotary kilns, mining mills, and industrial reducers. It is an integrated forged part that combines the gear and shaft into one, meshing with the large girth gear to transmit high torque, driving the main cylinder to rotate stably under extreme heavy-load conditions.
Core Functions
· Transmits high driving torque from the gear reducer/motor to the main girth gear
· Drives the ball mill / rotary kiln cylinder for continuous low-speed rotation
· Withstands heavy radial/axial loads, impact, and cyclic fatigue stress
· Ensures precise, smooth meshing with the large gear ring to minimize vibration
· Maintains long-term reliable operation in high-temperature, high-dust industrial environments
Material & Manufacturing Process
Material
· Standard Material: 42CrMo / 35CrMo alloy structural steel (for heavy-duty applications)
· Optional Material: 40Cr, 20CrMnTi, or customized high-strength alloy steel per customer requirements
· Material Features: High strength, excellent toughness, good hardenability, and outstanding fatigue resistance
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Drawing No |
OL 233 239 |
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Scope of supply |
All items in assembly drawing OL 233 239, including shaft OL 233 237, gear OL 331 343. Bearings shall be SKF self-aligning roller bearings, type CARB C 3156.
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Material |
Shaft material 18CrNiMo7, gear material 18CrNiMo7 Hardness after heat treatment: HB180-230
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Case hardening |
Shaft: Case depth 2.1-4.5mm, surface hardness HRC57-61 with carburizing treatment. - Gear: Case depth 1.8-3.8mm, surface hardness HRC57-61 with carburizing treatment.
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Detailed technical requirements and dimensions refer to attached drawings.
Note: Produced per drawing dimensions, production can only start after user confirmation.
Manufacturing Process
1. Integral Forging: One-piece forging to eliminate internal defects, enhance mechanical strength and impact resistance
2. Heat Treatment:
o Quenching and tempering (Q&T) for overall hardness (HB 260–300) and toughness
o High-frequency surface hardening / carburizing hardening on gear teeth (HRC 55–62) for superior wear resistance
o Stress relief annealing to prevent deformation
3. Precision Machining:
o Precision hobbing and grinding of gear teeth (accuracy grade: ISO 1328 6–8)
o High-precision grinding of shaft journals, keyways, and threads
o Strict concentricity and runout control to ensure smooth meshing
4. Quality Inspection:
o UT (Ultrasonic Testing) / MT (Magnetic Particle Testing) for internal and surface defects
o Dimensional inspection, hardness testing, and material certification
Structural Features
· Integral Forged Structure: One-piece design for maximum rigidity and load-bearing capacity
· Large Modulus Gear Teeth: Optimized tooth profile for heavy-load transmission, low noise, and long service life
· Precision Machined Shaft Journals: With keyways, threaded ends, or mounting shoulders for bearing and coupling installation
· High Roundness & Concentricity: Minimizes vibration and ensures stable equipment operation
· Customizable Design: Fully customizable per customer drawings (module, number of teeth, shaft diameter, length, etc.)
Application Scope
· Cement ball mills, rod mills, and raw material mills
· Cement rotary kilns, lime kilns, and metallurgical rotary kilns
· Large industrial reducers and gearboxes
· Mining grinding equipment, dryers, and rotary coolers
· Other heavy-duty rotary drive systems
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