Bearings and Lubricants

Radial Bearings

Magneto or Counterbored Bearings - These bearings are widely used in small motors. Except for the removal of one shoulder of the outer ring, they are identical to deep-groove bearings. The separable feature permits separate mounting of inner and outer rings. Radial and thrust capacities range from slightly less to about 30% more than deep-groove bearings.

Airframe or Aircraft-control Bearings - These Bearings transmit heavy radial loads under intermittent oscillation. These bearings are made in a number of different types and styles to meet special needs, but the majority are full-complement cageless bearings.

Self-aligning Bearings - These bearings come in internal and external types. Internal bearings have an outer-ring ball groove ground to a spherical surface. This surface makes these bearings insensitive to misalignment, but increases raceway contact stresses, which cuts load capacity.

Externally self-aligning bearings have a spherical surface on the outside of the outer ring, which matches a concave spherical housing. External bearings have better load capacity than internal, but demand greater radial space.

Double-row Bearings, deep-groove bearings embody the same principle of design as do single-row bearings. However, grooves for the two rows of balls may be positioned so that the load lines through the balls converge outwardly or inwardly. Inwardly converging bearings deflect more under moment loading, but can stand more misalignment. Some bearings, particularly the inwardly converging type, have filling notches so extra balls can be added to increase load capacity. These filling notches limit the thrust capacity in one direction.

Double-row bearings can be used where high radial and thrust rigidity is needed and space is limited. They are about 60 to 80% wider than comparable single-row deep-groove bearings and have about 50% more radial capacity.

Radial Bearings