Pillow-block bearings are a type of mounted bearing that consists of a bearing embedded in a housing that usually resembles a camelâs hump or a mantelpiece clock. Pillow-block bearings are frequently used for applications involving high rotational speeds, radial loads, and minimal axial (thrust) loads. They are best suited for stationary applications and are commonly used in manufacturing and processing where large-scale equipment is needed, such as in the construction, timber, mining, and publishing industries.
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The housing of pillow-block bearings is almost always metal, such as cast iron, and its base usually has two to four bolt holes to secure the unit to a mounting surface. The housing can be one- or two-piece, depending on the need to access the bearing. The housing frequently has a lubrication fitting for applying lubricant to the bearing. The type of bearing used within the pillow block housing depends on the requirements of the application. To address minor shaft misalignment, a self-aligning bearing is used. Spherical bearings, ball bearings, and journal bearings are also used. Pillow-block bearings are usually shielded or sealed to keep out contaminants.
A number of factors should be considered when selecting pillow-block bearings, including the type of bearing needed for the application and whether the bearing offers sufficient rotational speeds, correction for angular misalignment, and load support. Other considerations are whether the bearing should be shielded, sealed, or open, and how much room is available for mounting the base to a mounting surface. Story of my life video.
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