MB Split Spherical Roller Bearing with Brass Cage is a separable bearing designed specifically for heavy-duty and complex working conditions. Through structural innovation and material optimization, it has demonstrated significant technological advantages in fields such as mining machinery, steel mills, and cement rotary kilns. Starting from its structural characteristics, we will deeply analyze its core value:
1、 Split structure: simplifying installation and maintenance
Modular design: The bearing consists of an outer ring, an inner ring, a roller group, and a copper cage. The outer ring can be divided into two halves along the axial direction (similar to a "clamshell" structure), and can be replaced without disassembling the equipment.
Efficiency improvement: Compared to integral bearings, installation time is reduced by 60% -80% (for example, for bearings with a diameter of 800mm, integral bearings require 12 hours, while split bearings only require 2.5 hours).
Application scenario: In equipment such as paper drying cylinders and cement grinding rollers, it can avoid production interruptions caused by downtime and reduce single maintenance costs by more than 50%.
2、 Copper cage: high load-bearing and impact resistance
Material characteristics: The retaining frame is forged from brass (H62) or bronze (ZCuSn10P1), with a tensile strength of ≥ 350MPa and a hardness of HB120-160. Its impact resistance is twice that of steel retaining frames.
Heat dissipation optimization: The thermal conductivity of copper (116W/m · K) is three times that of steel, which can quickly dissipate the heat generated by roller friction and reduce the working temperature of bearings by 15% -20%.
Case verification: After adopting a copper cage in a certain mine crusher, the bearing operated continuously for 12000 hours under a 200kN impact load without the cage breaking, and the service life was extended by three times compared to a steel cage.
3、 Self centering ability: compensates for shaft deviation
Geometric design: The spherical raceway is matched with drum shaped rollers to automatically compensate for axis deviation caused by shaft bending, installation errors, or thermal expansion (maximum centering angle ± 1.5 °).
Data support: Under the condition of shaft offset of 0.5mm, the contact stress of the bearing only increases by 8% (the integral bearing increases by 30%), and the fatigue life reduction rate is less than 15%.
Analogous explanation: Similar to the "universal wheel" structure, it can adapt to the dynamic deflection of the shaft and avoid early failure caused by edge stress concentration.
4、 Heavy load and high-speed compatibility
Load distribution: Double row symmetrical roller structure, rated dynamic load increased by 40% -60% (such as 232 series bearings, C value is 5 times higher than deep groove ball bearings), can withstand radial loads and bidirectional axial loads.
Speed breakthrough: By optimizing the roller profile (logarithmic busbar) and the clearance between the cage pocket holes (0.1-0.3mm), compatibility between low-speed heavy load (50rpm/500kN) and medium speed light load (1500rpm/100kN) working conditions is achieved.
Application example: In the walking mechanism of a port crane, the bearings simultaneously bear the lifting load (800kN) and walking impact (acceleration 3m/s ²), with a lifespan of up to 80000 hours.
5、 Long term sealing and lubrication performance
Three lip seal: The outer ring is equipped with double-layer rubber sealing rings (contact type+labyrinth type) on the dividing surface, with a dustproof and waterproof rating of IP66, which can block particles with a diameter of ≥ 0.3mm.
Lubrication optimization: Built in lithium based composite grease (drip point ≥ 220 ℃), combined with a split structure to achieve non disassembly lubrication replenishment, the lubrication cycle is extended to 2 years (integral bearings require six months of maintenance).
Data comparison: In the vertical grinding system of cement plants, the consumption of lubricating grease for split copper bearings is reduced by 70% compared to ordinary bearings, and maintenance hours are reduced by 85%.
6、 Balancing Economy and Reliability
Full life cost: Although the unit price is 20% -30% higher than that of integral bearings, the comprehensive cost is reduced by 40% -50% due to shortened downtime and extended lifespan (MTBF ≥ 50000 hours).
Redundancy design: Adopting a "roller redundancy layout" (with 10% more rollers than the standard design), it can maintain operation even if individual rollers fail, avoiding catastrophic downtime.
Industry certification: Verified by ISO 281:2017 life calculation, the theoretical life can reach 120000 hours (L10 benchmark) under P=0.9C (90% rated load) condition.
Summary: MB split copper cage self-aligning roller bearings have overcome the pain points of "difficult installation, short service life, and expensive maintenance" in heavy-duty equipment through three core technological breakthroughs: split structure, copper cage, and self-aligning design. Its "high reliability, low downtime, and long lifespan" characteristics are particularly suitable for repairing large rotating machinery with limited space and harsh working conditions, and are key components for improving overall equipment efficiency (OEE).