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Engineered for absolute reliability in heavy industrial environments, our DIN Standard Sliding Bearings (commonly referred to as DIN Bearings) are meticulously designed and manufactured in strict accordance with the German DIN standard system. The heavy-duty bearing housing is cast from premium gray cast iron or high-strength ductile cast iron, providing exceptional structural rigidity that absorbs intense mechanical stress. Inside, the bearing liner utilizes a precision-machined split structure, featuring a meticulously bonded Babbitt alloy lining on its inner surface. This creates a visually distinct, smooth metallic contact area optimized for fluid film generation.
To accommodate varying mechanical demands, the housing and liner incorporate a dual spherical fit. This self-aligning functionality compensates for minor shaft deflections while delivering high structural strength and rapid heat dissipation. Depending on your operational requirements, multiple thrust pad configurations are available, including Type Q (non-thrust), Type B (flat thrust), Type K (bidirectional tapered thrust), Type E (unidirectional tapered thrust), and Type A (tilting thrust pads). By establishing a stable sliding contact between the rotating shaft and the supporting structure, these bearings rely on a continuously replenished lubrication film to drastically reduce friction and mechanical wear over prolonged operational cycles.
The steam turbine DIN sliding bearings manufactured by our facility strictly adhere to core engineering standards, specifically DIN 31693 and DIN ISO 13373-4. They are specifically configured for high-speed and heavy-duty steam turbine applications, serving as the critical core components that ensure the unwavering stable operation of the entire rotor system. These bearings are trusted across demanding sectors, perfectly complementing mainstream turbine brands such as Siemens and GE. Their deployment spans across power generation plants, petrochemical refineries, and heavy marine propulsion systems where continuous operation is mandatory.
The product features a highly adaptable modular structural design, covering a comprehensive range of bearing liner types to suit distinct hydrodynamic requirements. It accommodates rotor diameters ranging from 80 to 355 mm, meeting the diverse structural needs of steam turbines from small and medium-sized utility units all the way up to massive, large-scale 1000MW-class turbines.
Cylindrical Liners: Engineered for standard load distribution and straightforward hydrodynamic lubrication.
Elliptical Liners: Delivers enhanced stability against oil whirl in high-velocity rotational environments.
Three-Lobe Liners: Provides superior centering capabilities for demanding, high-vibration rotor dynamics.
3-5 Tilting Pad Liners: Offers maximum dynamic stability, adapting instantly to fluctuating operational loads and thermal shifts.
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The bearing liners employ a highly resilient steel-backed + Babbitt alloy composite structure. Through advanced precision casting processes, a microscopically tight bond between the dissimilar metal layers is achieved. This metallurgical synergy provides both the high-strength support required for massive rotors and the excellent friction-reducing performance characteristic of premium Babbitt surfaces.
To manage the intense heat generated at extreme rotational velocities, the design integrates a forced oil circulation system with strategically placed cooling channels. This ensures that the operating temperature is strictly controlled below 85°C, with a return oil temperature maintained at ≤65°C. This exceptional thermal stability allows the bearing to comfortably tolerate short-term overload impacts without compromising the integrity of the hydrodynamic oil film.
Addressing modern environmental and operational demands, we offer RoHS-compliant lead-free Babbitt alloy configurations. For exceptionally harsh environments where boundary lubrication might occur during start-up or coast-down phases, optional self-lubricating anti-friction coatings, such as PTFE or specialized graphite composites, can be applied to the liner surface to further minimize mechanical wear and extend operational longevity.
Precision engineering dictates the performance of our DIN sliding bearings. Key technical parameters are strictly controlled during the machining phase to guarantee optimal fluid dynamics. The radial clearance is meticulously calibrated to 0.001-0.002 times the shaft diameter, while the width-to-diameter ratio (B/d) is optimized to a precise 0.3-1.0 range. This specific geometric relationship ensures the rapid formation and stable maintenance of a pressurized wedge-shaped oil film, effectively preventing destructive oil film whirl even under fluctuating loads.
These bearings exhibit extraordinary vibration damping characteristics, expertly managing complex combined radial and axial loads. This capability is vital for preventing rotor thermal deformation and eliminating the risk of seal collisions, thereby safeguarding long-term operational security.
| Technical Parameter | Specification Value |
|---|---|
| Radial Clearance | 0.001-0.002 times the shaft diameter |
| Width-to-Diameter Ratio (B/d) | 0.3-1.0 |
| Operational Speed Range | 3000-6000 r/min |
| Maximum Linear Speed | 120 m/s |
| Max Load Capacity (Large Thrust Type) | Up to 960 KN |
Our facility integrates sophisticated precision machining with rigorous, multi-stage quality inspection processes. The tactile smoothness of the bearing is a direct result of strict surface finishing protocols, where the surface roughness of the liner bore is controlled well below Ra0.8μm. The spherical self-aligning structure is dynamically tested to ensure it can perfectly adapt to shaft misalignment, guaranteeing straightforward installation accuracy and long-term operational stability.
To validate structural integrity, we employ comprehensive Non-Destructive Testing (NDT), including Ultrasonic Testing (UT) to detect sub-surface anomalies in the Babbitt bonding, alongside dynamic load alignment tests. Backed by ISO international quality system certifications, every bearing is verified for excellence before dispatch. The internal lubrication oil path design perfectly balances cooling and lubrication efficiency. Combined with a meticulously engineered sealing structure, it effectively prevents oil leakage, dramatically extending the continuous service life to over 22,000 hours.
Recognizing the critical nature of power plant and industrial facility uptime, we provide comprehensive lifecycle support extending far beyond standard manufacturing. For aging steam turbine units requiring modernization, our engineering team conducts precise reverse engineering and dimensional mapping. This allows us to deliver exact OEM replacements, custom non-standard sizes, and bespoke solutions tailored to unique or highly specialized operating conditions.
Furthermore, our bearing assemblies feature a quick-swap housing design specifically engineered to minimize labor during critical maintenance windows. We offer rapid-response spare parts supply and dedicated support aligned with your facility's scheduled overhaul cycles, ensuring that critical rotating equipment is brought back online safely and efficiently.
