About Cast Iron Bearing Cap for Reducers and Gearboxes
Cast iron bearing cap for reducers and gearboxes is a cast iron sealing or positioning component used with reducers and gearboxes. It is mostly cap‑shaped or end‑cover structured, wholly made by casting from cast iron, and mounted on the outer side of bearings to axially lock the bearings.
In actual use of cast iron bearing caps, have you ever worried about or encountered problems such as oil and water leakage caused by uneven fitting surfaces, insufficient hardness due to casting porosity, and poor universality of standard parts?
Our Solution
If you have the above worries or problems, you can contact us at Shata Machinery to solve the pain points concerning cast iron bearing caps for reducers and gearboxes.
As a foundry specialized in producing cast iron bearing caps, Shata Machinery offers customized one‑stop production services.
In addition, Shata Machinery has more than 20 years of extensive manufacturing experience, unique casting expertise and professional production processes. We are equipped with a full range of casting technologies, including sand casting, resin sand casting, sodium silicate sand casting, lost foam casting, and others.
In the production of bearing caps, Shata Machinery can minimize casting defects through our proprietary production technologies and ensure better fitting of the cast iron bearing caps with the equipment.
Production Processes of Cast Iron Bearing Cap for Reducers and Gearboxes
Currently, the three mainstream processes for cast iron bearing caps on the market are green sand casting, coated sand casting, and lost foam casting.
Among these three mainstream processes, coated sand casting is generally the most suitable choice for conventionally used cast iron bearing caps with certain requirements for appearance and assembly accuracy.
Green Sand Casting
Advantages: lowest production cost for cast iron bearing cap for reducers and gearboxes; suitable for mass large‑scale production; strong compatibility with conventional specifications.
Disadvantages: rough casting surface, prone to casting defects, and average dimensional accuracy.
Coated Sand Casting
Advantages: small dimensional error and good accuracy of castings, fine and smooth surface; few casting defects; suitable for stable medium‑batch production.
Disadvantages: production cost slightly higher than green sand casting, and weaker comprehensive cost advantage than green sand process in mass production.
Lost Foam Casting
Advantages: highest dimensional accuracy, good surface finish; strong structural adaptability, capable of integrally forming complex and special-shaped bearing caps without parting surfaces.
Disadvantages: its production cost, similar to that of coated sand, is slightly higher than that of green sand casting.
General Parameters of Cast Iron Bearing Cap for Reducers and Gearboxes
| Parameter Item | Details |
|---|---|
| Product Name | Cast Iron Bearing Cap for Reducers and Gearboxes |
| Product Type | Through cover, blank cover, flanged type, embedded type, type with oil nozzle / observation hole; customizable according to drawings |
| Overall Dimensions | Conventional outer diameter: 50mm–1000mm, inner hole: 20mm–280mm, thickness: 10mm–80mm; customizable |
| Product Weight | Single piece: 0.3kg–2000kg; customizable according to size |
| Main Material | Gray cast iron HT200, HT250; ductile iron QT450-10; alloy cast iron; customizable materials |
| Brinell Hardness | HT200: 170~240HB; HT250: 180~250HB; QT450-10: 160~220HB |
| Forming Process | Sand casting, coated sand casting, lost foam casting |
| Machining Process | Face milling, fine boring of inner hole, drilling and tapping, chamfering, deburring, etc. |
| Surface Treatment | Anti‑rust painting, blackening, rust removal and passivation; customizable as required |
| Applicable Temperature | -20℃ ~ 120℃ |
| Tolerance Grade | Conventional machining: IT9~IT12 |
| Applicable Equipment | Industrial reducers, gearboxes, various transmission gearboxes, etc. |
| Main Functions | Axial positioning of bearings, sealing and dust prevention, oil leakage prevention, auxiliary heat dissipation |
FAQ
01.Can you produce standard or non-standard cast iron bearing cap for reducers and gearboxes?
02.How do casting defects such as air holes, shrinkage porosity and sand holes affect usage? How do you control them?
03.Are bearing caps of different standards (GB, DIN, ANSI) interchangeable in dimensions?
04.Why choose Shata Machinery?
Selection Guide for Cast Iron Bearing Cap for Reducers and Gearboxes
1.By Structure Type
Through cover: Motor‑direct connected reducers, gearboxes with extended output shafts, transmission boxes of conveying equipment;
Blank cover: Closed ends of gearboxes, reducers with built-in drive shafts, side sealing positions of boxes;
Flanged type: Large industrial reducers, gearboxes for heavy equipment (heavy‑load, requiring strong fixation);
Type with oil nozzle: Field or heavy equipment needing frequent oil replenishment, such as mining, metallurgy and agricultural machinery;
Embedded type: Small precision reducers, gearboxes for light industrial equipment such as home appliances.
2. By Material
Gray cast iron HT200: Suitable for conventional loads and indoor dry environments, e.g., gearboxes of general industrial reducers, assembly lines, fans, water pumps and ordinary agricultural machinery;
Ductile iron QT450: Suitable for high loads, strong vibration and outdoor working conditions, e.g., gearboxes of construction machinery, mining machinery, hoisting equipment and heavy‑duty agricultural machinery;
Alloy cast iron: Suitable for anti‑corrosion requirements, e.g., transmission boxes of chemical equipment, water treatment equipment, and high‑humidity or salt‑spray coastal environments.
3. By Application Environment
Indoor dry environment: Standard gray cast iron with conventional machining is sufficient;
Outdoor or open‑air environment: Cast iron with blackening or anti‑rust painting;
Humid or corrosive environment: Priority to ductile iron with anti‑corrosion coating or alloy cast iron.
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