INA RA40 Flanschlager-Gehäuseeinheiten

As a housed bearing unit, this product combines a housing with a ready-to-mount bearing insert. The specification table sets out the technical particulars on record. Single seal, sheet metal housing, insert bearing in standard bearing steel: the simplest complete version of this design. In this version too the bearing position is complete as an assembly: the insert bearing already sits in the housing, the unit is bolted on and the shaft is locked by the fastening provided.

The difference lies in the housing body. A formed sheet steel part is lighter than a cast housing, builds lower and permits thinner walls; in return it is more compliant and damps vibration less. Two consequences follow for the designer. First, the stiffness of the bearing position shifts into the adjacent construction: an uneven, thin or inclined mounting face acts more directly on the position of the insert than it would with a cast body, and a backing plate or a stiffened zone at the bolting point is, in case of doubt, the simpler solution compared with a larger size.

Second, the design is laid out for moderate load and for operation without appreciable shock loading — on fans, light drives, attachments and lightly loaded conveying equipment. The insert bearing sits with its spherical outer surface in the housing and aligns itself to the shaft during mounting; its rings and rolling elements are made of standard bearing steel.

The single seal closes the rolling chamber in one stage and covers dry to moderately dusty surroundings; for continuous water or abrasive dust, a multi-stage seal is preferable. Corrosion protection of the sheet metal body has to be assured through coating or through the environment.