Feature of needle roller bearing without inner ring

  The main feature of needle roller bearing without inner ring is their low cross-sectional height and high load-bearing capacity. Mainly used for bearing configurations that are compact in structure, cheap in price, and cannot be used as raceway components for needle roller cages. The bearings and bearing housings must be installed in an interference fit manner. If axial positioning functions such as shoulder and stop ring can be omitted, then the bore inside the bearing box can be made extremely simple and economical. The needle roller bearing without inner ring installed at the shaft end have two types: double-sided open type and single-sided closed type. The base end face of the closed stamped outer ring can withstand relatively small axial guiding forces.

  Bearings generally adopt a single row design. Except for the wider specification bearings 1522/1622/2030/2538 and 3038 series, which are equipped with two needle roller cage components. The outer ring of the bearing has lubricating oil holes. According to user needs, all single row needle roller bearing without inner ring with a shaft diameter greater than or equal to 7mm can be equipped with outer rings with lubricating oil holes (code suffix AS1). Oil sealed needle roller bearings without inner rings can be provided with open or closed end oil sealed bearings in situations where oil seals cannot be installed due to space limitations. This type of bearing is equipped with a friction type oil seal made of polyurethane or synthetic rubber, which is filled with lithium based grease with good rust prevention performance. The bearing inner ring also has lubrication holes, which can be supplemented by the outer or inner ring according to the needs of the bearing configuration.

  This type of bearing has no inner ring and is suitable for support structures with limited radial installation dimensions.The journal that matches the bearing is directly used as the rolling surface. As the shaft of the raceway surface, it must be quenched and ground, and only when it is machined to the appropriate size and shape accuracy, can the entire needle roller bearing have a high service life and operating accuracy. Meanwhile, due to the absence of an inner ring, the diameter of the shaft can also be appropriately increased, thereby also increasing rigidity.

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