Integrated 'bolt-on' ready bearings are sealed and self-lubricating
15 February 2011
NSK’s RHP range of Self-Lube housed bearing units are ready assembled to bolt into place, and come complete with facilities for sealing and relubricating. Self-Lube bearings conform to ISO standards, and are available in different materials and configurations. Cast Iron pillow block and flange types are used for normal and medium duty applications, while zinc plated press steel units are available for lighter duty operations.
NSK has also introduced the Silver-Lube range of corrosion resistant bearings and housings. Together with the RHP Life- Lube range, Silver Lube bearings can also benefit from the sealed-for-life lubrication provided by NSK’s 'Molded-Oil' technology. Ideal for operation in wet or inaccessible applications, Molded Oil is a solid lubricant. This means that operating environments are kept free of grease – very important in food applications. In addition, there is no need for refilling of lubricant, as Molded Oil provides a continuous supply of lubricating oil.
Essentially Self-Lube housed bearing units consist of an insert, normally a 6200 series deep groove ball bearing with cast iron (pillow block, flange or take-up unit) or pressed steel housings. The bearing insert can carry a combination of radial and axial loads in the same way as a standard ball bearing. It has an extended inner ring with integral shaft locking device and a spherical outer ring that matches the spherical bore in the housing to overcome initial housing misalignments up to 0.030 radians.
A number of insert types are available for use in light and heavy applications and high and low temperature operating conditions. Heavy-duty types are used widely in equipment such as pumps and fans. Designed with a wide inner ring they facilitate a wide range of locking methods.
The simplest of these, set screw locking, is suitable for most applications excepting those where vibration is a problem. Where vibration does occur an eccentric locking collar mechanism is supplied. Alternatively, in applications where positive concentric lock is required, or when heavy vibration or shock loads are present, a taper lock system is preferred.
With all these locking arrangements, standard shafting can be used – there is no need for a precision interference fit.
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