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Product Overview & Standards
DIN Standard Sliding Bearing (commonly referred to as DIN Bearings) are high-reliability bearing products designed and manufactured in accordance with the German DIN standard system. The bearing housing is made of gray cast iron or ductile cast iron, and the bearing liner adopts a split structure with a Babbitt alloy lining on its inner surface. The bearing housing and liner are designed with a dual spherical fit, providing self-aligning functionality, high strength, and excellent heat dissipation. Multiple thrust pad configurations are available (Type Q: non-thrust, Type B: flat thrust, Type K: bidirectional tapered thrust, Type E: unidirectional tapered thrust, Type A: tilting thrust pads). These bearings create sliding contact between the shaft and the supporting structure, relying on a lubrication film to reduce friction and wear.
Applications & Specifications
The steam turbine DIN sliding bearings manufactured by our company strictly adhere to core standards such as DIN 31693 and DIN ISO 13373-4. They are specifically designed for high-speed and heavy-duty steam turbine applications, serving as critical core components that ensure the stable operation of the rotor system. The product features a modular structural design, covering various bearing liner types including cylindrical, elliptical, three-lobe, and 3-5 tilting pad liners. It accommodates rotor diameters ranging from 80 to 355 mm, meeting the diverse needs of steam turbines from small and medium-sized units up to large-scale 1000MW-class turbines.
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Liner Structure & Materials
The bearing liners employ a steel-backed + Babbitt alloy composite structure. Through precision casting processes, a tight bond between the metal layers is achieved, providing both high-strength support and excellent friction-reducing performance. The operating temperature is controlled below 85°C, with a return oil temperature ≤65°C, allowing tolerance to short-term overload impacts.
Key Performance Parameters
Key technical parameters are strictly controlled: the radial clearance is 0.001-0.002 times the shaft diameter, and the width-to-diameter ratio (B/d) is optimized to 0.3-1.0. This ensures the rapid formation and stable maintenance of a wedge-shaped oil film, effectively preventing oil film whirl. The product is suitable for speeds of 3000-6000 r/min, with a maximum linear speed of 120 m/s. Large thrust-type bearings offer a load capacity of up to 960 KN, featuring low friction loss and outstanding vibration damping characteristics.
Manufacturing & Quality Assurance
Our company integrates precision machining and rigorous quality inspection processes into the manufacturing. The surface roughness of the liner bore is controlled below Ra0.8μm. The spherical self-aligning structure can adapt to shaft misalignment, ensuring installation accuracy and operational stability. The lubrication oil path design balances cooling and lubrication efficiency. Combined with a high-quality sealing structure, it effectively prevents oil leakage and extends the service life to over 22,000 hours.
