Pinion Shaft
Product Description
A pinion shaft is a high-precision transmission component that meshes with a girth gear (large ring gear) to drive heavy rotary machinery such as rotary kilns, ball mills, rod mills, dryers, and rotary coolers.It is mounted between the drive motor, gear reducer, and the main equipment, transmitting torque to drive the cylinder to rotate smoothly and continuously under heavy load.
Key Functions
Transmits driving torque from the gearbox to the girth gear
Ensures stable, low-speed rotation of the kiln or mill
Withstands heavy radial and axial loads, shock, and fatigue
Maintains precise meshing with the large gear ring
Supports stable operation under high dust and high-temperature conditions
Material & Heat Treatment
Materials:30CrNiMo8, Hardness requirement: HB260-300 Gear quenching and tempering + gear grinding, Grade 6 precision. Produced according to the customer's drawing dimensions and the drawing confirmed by the user.
Heat treatment:
Quenching and tempering (Q&T)
High-frequency surface hardening
Tempering to improve toughness
Hardness: HB220–280, HRC45–55 on tooth surface
Design & Structural Features
Integral forged shaft with precision-machined pinion gear
High accuracy gear grinding (Grade 6–8 accuracy)
High concentricity, low runout, smooth meshing
Equipped with keyways, threaded ends, or mounting shoulders
Designed for long service life under continuous heavy-duty working conditions
Suitable for forward and reverse operation
Application Scope
Rotary kilns (cement, lime, metallurgy)
Ball mills & cement mills
Dryers, coolers, agglomerators
Other large rotary drive systems
Related Products
Mill Shell
Mill shell is the main cylindrical body of a ball mill, rod mill or cement mill. It is a large, heavy-duty welded or cast steel cylinder that holds grinding media (steel balls, rods) and materials during the grinding process. Mill Shell (φ4×13.5m) The manufacturing and acceptance standards of the product shall be implemented in accordance with the drawing requirements signed and confirmed by the user. Scope of Supply: 1. Flange - 2 pcs (Material: ZG270-500)2. Shell - 1 pc
Roller Shaft for Cement Plant | S42CrMo Forged Roller Shaft
Custom integral forged roller shaft made of S42CrMo, with surface hardness HRC 58-62. Complete with oil retaining rings and full quality inspection reports for cement mill applications.
φ6.4x90m Rotary kiln tyre shell section
The tyre shell section is a specially reinforced cylinder section mounted at the supporting position of a φ6.4×90m large-scale rotary kiln.It is welded between the main kiln shell and the rotary kiln tyre (riding ring), used to transfer the full weight of the kiln body, lining and materials to the supporting rollers. 1. According to the drawings provided by the customer, the shell shall be fabricated in two halves and shipped in split sections. During transportation, no
Heavy Duty Large Girth Gear for Rotary Kiln and Ball Mill
A girth gear (also called ring gear ) is a large-diameter, heavy-duty gear assembly mounted on the shell of rotary kilns, ball mills, dryers, and other rotary equipment. It meshes with the pinion shaft to transmit driving torque and drive the cylinder to rotate smoothly under heavy load. Functions · Transmit high torque from the pinion shaft · Drive the rotary kiln or ball mill to rotate continuously · Support stable operation under heavy impact and fatigue load · Ensure low
