Technical Specifications of Pinion Gear
Module range: M10 – M70 (customizable)
Common modules: M14, M18, M20, M22, M24, M25, M26, M28, M30
Material: 35SiMn, 40CrMo, ZG310-570, ZG45#, alloy steel, forged steel
Heat treatment: Normalizing, quenching and tempering (Q&T), carburizing
Tooth surface hardness: HRC40–55 (after tempering)
Gear accuracy grade: Grade 5-9 (ISO 1328)
Processing weight: ≥ 1 ton
Application: Ball mill, rotary kiln, rotary dryer, other heavy-duty equipment
High-Strength Alloy Steel Drive Pinion Gear Manufacturer
The ball mill pinion (also called ball mill pinion gear or mill pinion) is a key transmission component of the ball mill. It works together with the girth gear to drive the rotation of the mill cylinder. The pinion is driven by the motor and transmits power to the large gear, causing the ball mill to rotate for grinding operations.
The ball mill pinion gear is widely used in cement plants, mining industries, metallurgy, power stations, and chemical plants. As a professional ball mill pinion manufacturer with over 20 years of experience, AGICO produces high-quality ball mill pinions for sale that are durable, efficient, and reliable. Unlike ordinary suppliers, AGICO provides engineering support throughout the equipment lifecycle, ensuring our pinion gear not only “fits the mill” but also optimizes grinding performance.
Because the mill pinion rotates several times for each rotation of the large girth gear, its teeth engage and disengage more frequently, resulting in higher wear rates. This makes the pinion for the ball mill a vulnerable part that requires regular inspection and replacement. AGICO ball mill pinion products are designed with higher hardness (typically 30–50 HB above the girth gear) and better wear resistance to extend service life.
Working Principle of Ball Mill Pinion Gear
The ball mill pinion gear is a cylindrical gear that meshes with the girth gear mounted on the mill shell. When the motor rotates, the pinion turns, driving the girth gear, which in turn rotates the entire ball mill cylinder. This transmission system provides the torque required to grind materials such as cement clinker, ore, and coal.
Typically, the large gear rotates once while the ball mill pinion rotates several times. This means the pinion is subjected to more force and has a higher wear rate than the girth gear. A poor-quality pinion gear can cause premature tooth wear, tooth breakage, severe vibration, or gear misalignment, leading to unplanned downtime and high maintenance costs. AGICO ball mill drive gear products are engineered to avoid these problems through strict material selection, precision machining, and advanced heat treatment.
Ball Mill Pinion Materials
AGICO uses high-performance alloy steels to ensure the strength, wear resistance, and impact resistance of our ball mill pinion gear. The pinion hardness is typically 30-50 HB higher than the girth gear, with the tooth surface reaching HRC40-55. All raw materials are strictly tested before production to ensure chemical composition meets required standards.
- 35SiMn: Good hardenability, high strength, wear resistance, economical
- 40CrMo: High-strength alloy steel, excellent toughness and fatigue resistance
- ZG310-570: High wear resistance, good hardness, and toughness for ball mills above 2.2m
- ZG45#: Suitable for small-scale ball mills, cost-effective
- 42CrMo: Enhanced wear resistance, high hardness, long service life
Advantages of AGICO Ball Mill Pinion Gear
Stronger and Lasts Longer
Made of high-strength alloy steel with strict quality control. Our pinion is harder than the girth gear (30-50 HB higher), so it wears slowly. With good care, it lasts 8–12 years, 30–50% longer than ordinary pinions. Special heat treatment makes the surface hard (resists wear) and the core tough (prevents cracks).
High Precision, Smooth Running
AGICO designs the tooth shape so the pinion meshes smoothly with your girth gear. This means less vibration, less noise, and less stress on the teeth. We also control the gap (backlash) precisely – no jamming, no extra wear.
Two Options: Forged or Cast
- Forged steel: stronger, good for heavy impact, and large mills
- Cast alloy steel: reliable, good for normal use, and for big sizes
AGICO helps you choose the right one for your mill.
Complete Quality Inspection
Every AGICO pinion is fully tested: crack check (magnetic particle), hardness test, and material test. You get a complete test report with every pinion.
Custom Pinion for Worn Girth Gear
If your girth gear is already worn, a standard pinion will not fit well. AGICO can measure your old gear and make a custom pinion to match. This saves you from buying new girth gear too early.
Fast Delivery for Urgent Needs
Pinions wear out faster than girth gears. AGICO keeps semi-finished blanks for common sizes (module M14 to M30). For urgent orders, we can deliver a finished pinion in only 15–20 days.
Manufacturing Process
AGICO follows a strict manufacturing process to ensure every ball mill pinion meets the highest quality standards. Our foundry has a casting capacity of 30 tons for single-piece cement equipment.
- Wood pattern making
- Molding
- Smelting
- Pouring
- Sand cleaning
- Heat treatment
- Rough processing
- Finish processing
- Gear hobbing or shaping
- Non-destructive testing
- Assembly
- Packaging and delivery
Production Equipment
AGICO has a large-scale foundry factory equipped with
- 20+ sets of gear processing equipment (hobbing, shaping, lathes, milling)
- Hobbing machines with diameter ranging from 3m to 10m
- CNC vertical lathes and CNC lathes
- Heat treatment electric furnaces
- Complete testing system (UT, MT, mechanical property, impact testing)
AGICO can produce various specifications of ball mill pinion for sale according to customer drawings. Standard lead time: 30–45 days.
Installation and Maintenance
Installation
Before installation, carefully check all parts, including the bearing pedestal, bearing cover, bearing, pinion, and shaft. Remove burrs on the gear surface and thoroughly clean all components.
Maintenance – To extend service life:
- Maintain good lubrication: Regularly check lubricant levels and quality.
- Check alignment: Monitor meshing clearance between pinion and girth gear.
- Inspect for abnormal wear: Look for pitting, cracking, or uneven wear.
- Monitor temperature and vibration: Sudden changes may indicate problems.
- Replace when necessary: If severe vibration or tooth damage occurs, replace the ball mill pinion promptly.
Applications
Our ball mill pinion is suitable for:
- Cement plants: cement ball mill, raw meal mill, coal mill
- Mining industry: SAG mill, AG mill, rod mill
- Power stations: coal grinding mills
- Steel plants: slag ball mills
- Metallurgical industry: various grinding mills
- Rotary kilns: for cement and lime production
Frequently Asked Questions (FAQ)
Q1: What is a ball mill pinion?
A: A ball mill pinion is a small cylindrical gear that meshes with the girth gear on the ball mill shell. It is driven by the motor and transmits power to rotate the entire ball mill cylinder.
Q2: Why is the ball mill pinion a vulnerable part?
A: The pinion rotates several times for each rotation of the large girth gear, resulting in higher wear rates. AGICO ball mill pinion gear is designed with higher hardness to extend service life.
Q3: What materials are used for AGICO ball mill pinions?
A: AGICO uses 35SiMn, 40CrMo, ZG310-570, ZG45#, forged steel, and more. Tooth surface hardness reaches HRC40-55 after heat treatment.
Q4: Can AGICO produce pinions according to my drawings?
A: Yes. AGICO accepts custom orders based on customer drawings, including special sizes, modules, tooth numbers, and materials. We also offer reverse-engineering for old equipment.
Q5: What is the lead time for a ball mill pinion?
A: Standard lead time is 30–45 days. Contact us for urgent replacement needs.
Q6: What other ball mill spare parts does AGICO supply?
A: AGICO supplies girth gears, liners, diaphragms, end covers, trunnions, bearings, and steel grinding balls.
