Cast iron reducer housing / gearbox casting

Structure and Functional Breakdown

Material: Gray cast iron casting (commonly HT250/HT200, corresponding to Russian standard СЧ25/20 ГОСТ 1412). Cast iron has good vibration damping and sufficient rigidity, making it very suitable for gear transmission housings.

Functions of Each Part

• Internal Cavity: Contains gears, shafts, and bearings; holds gear lubricating oil.

• High-Precision Bored Holes: Input and output shaft bearing mounting seats, ensuring coaxiality.

• Side Threaded Holes: Oil filling holes, oil drain holes, and oil level observation holes.

• End Face Flange Threaded Holes: Used to fasten the housing cover for sealing.

• External Wall Reinforcing Ribs + Mounting Lugs: Improve the housing's vibration resistance and fix the entire assembly to the equipment frame.

• External Surface Gray Paint: Outdoor rust prevention and protection; the internal cavity is not painted to prevent paint residue from contaminating oil.

II. Application Scenarios

Mainly used in gear reduction mechanisms of engineering machinery, mining equipment, hoists, agricultural machinery, and heavy-duty transmission equipment. It is a core pressure-bearing housing casting in the transmission system.

III. Key Quality Control Points in Production:

Stress relief aging is mandatory after casting to prevent deformation during subsequent machining;

Strict control over the dimensional accuracy and geometric tolerances of bearing holes;

Leakage testing of the housing is conducted to prevent oil leaks;

Thorough cleaning of the internal cavity removes sand to prevent metal shavings from abrading the gears.