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

CDIM (full name: CDI-Machinery) is affiliated with CDI (INTERNATIONAL), INC. and with the background of CME Group (Chongqing Machinery Group). Leveraging the strong manufacturing advantages of China and relying on the country’s mature and well-established industrial supply chain system, CDIM focuses on providing professional custom manufacturing services based on drawings for mechanical equipment and spare parts to global clients. The industries we serve include steel, cement, metallurgy, mining, paper, and other heavy industries.

CDIM integrates high-quality mechanical manufacturing resources across China, combining the scale advantages and professional capabilities of China’s equipment manufacturing sector to deliver efficient, precise, and reliable products to customers. The company has a solid foundation in project management, supply chain integration, quality control, and international trade services, enabling us to provide integrated solutions from technical communication to final delivery.

Currently, our clients are located across Southeast Asia, the Middle East, Africa, and other regions. Over the years, we have continuously supplied overseas industrial enterprises with high-standard products and professional services, establishing stable partnerships and a strong market reputation.

Looking ahead, CDIM will continue to deepen its presence in the industrial manufacturing sector, further enhance its resource integration capabilities and digital service level, and strive to build a professional drawing-based manufacturing platform that connects global customers with Chinese manufacturing.