Girth Gear

A girth gear is a large, circular gear fixed to the outer circumference of rotary equipment such as ball mills, rotary kilns, and dryers. It serves as the main driving component that transmits rotational motion from the pinion gear to the equipment's shell. Girth gears are critical to the operation of heavy-duty industrial machinery and are typically designed to handle significant loads and stress.

Materials Used for Girth Gears

Cast Steel: Commonly used due to its high strength, toughness, and machinability.

Forged Steel: Provides superior mechanical properties and resistance to stress and fatigue.

Ductile Iron: Offers good wear resistance and cost-effectiveness for moderate-duty applications.

Alloy Steel: Enhanced mechanical properties and resistance to heat and wear for demanding applications.

Manufacturing Process for Girth Gears

Casting or Forging:

The gear blank is created through casting or forging, depending on the size and application.

Machining:

The blank is precision-machined to create the teeth and ensure dimensional accuracy.

Heat Treatment:

Processes like normalizing, tempering, or induction hardening improve mechanical properties.

Inspection:

Non-destructive testing (NDT) methods like ultrasonic or magnetic particle inspection ensure the absence of defects.

Assembly:

Segments are aligned and bolted together to form a complete girth gear.

Design Considerations for Girth Gears

Tooth Geometry:

Designed to minimize wear, noise, and vibration during operation.

Load Capacity: Calculated to handle the maximum torque and load conditions.

Material Selection: Must balance strength, wear resistance, and cost.

Alignment: Precision alignment with the pinion gear ensures smooth operation and prevents premature wear.

Thermal Expansion: Considered in the design to account for temperature changes during operation.

Girth Gear Application Range

Our productions mainly used in fields of mining, metallurgy, cement, sugar plant, petrochemical industry, construction, and recycling facilities, aggregate.
Which is including non-standard machinery components, custom castings, forged parts, gears, shafts, ball mill spares, rotary kiln etc.

Advantage of Gear 

1.Great load-bearing capacity,and extended durability. 

2.High precision,large diameter and significant module. . 

3.Steady transmission,Minimal impact

4. forging or casting according to the customer’s requirements

5.Ultrasonic inspection will be conducted to ensure that the materials are free from pores, holes, and cracks.

Specification as below