This bearing, however, does not allow for the oil to permeate through the bearing material. Permawick is also packed around the rigid sleeve bearing. The rigid sleeve bearing is pressed into the end bells of the motor. The bearing material allows the oil to completely permeate the bearing, providing a film of oil between the shaft and the bearing Lubrication is packed around the bearing using Permawick. This feature allows for realignment of the bearing if, for example, the shaft is inadvertently hit or bumped during installation. The self-aligning sleeve bearing is designed so that it can move when installed in the end bells of the motor. There are two types of sleeve bearings frequently used: self-aligning and rigid. Improper belt tension is a common cause of premature bearing failure. A belt-drive application is an example of a radial load. A fan blade is an example of an axial load. The load can be axial (parallel to the shaft) or radial (perpendicular to the shaft). At that rating and beyond there is typically too much load for the sleeve bearing and bearing and motor life expectancy is shortened. Sleeve bearings are common in HVACR applications up to about 1 horsepower. There are special bearing designs that may occur, but we’re going to talk about the most common designs. In the HVACR industry, motors are typically designed with ball bearings or sleeve bearings. When the motor and equipment manufacturers determine the bearings to be used in the motor, some of the considerations include the application, load, conditions, environment, operating temperatures, direction of load, required life, operating speed, speed controls, noise levels, end play, lubrication, and exposure to moisture and condensation. These include direct drive fans and blowers, belt-drive fans and blowers, pumps, actuators, and gear drives to name a few. There are lots of different applications in HVACR systems that utilize motors.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |