BALL SCREW SUPPORT BEARINGS NSKHPS – BSBD SERIES

As one of the world’s leading manufacturers of rolling bearings, linear technology components and steering systems, we can be found on almost every continent – with production facilities, sales offices and technology centres – because our customers appreciate short decision-making channels, prompt deliveries and local service. Asia The Americas Oceania Africa The NSK company NSK commenced operations as the first Japanese manufacturer of rolling bearings back in 1916. Ever since, we have been continuously expanding and improving not only our product portfolio but also our range of services for...

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Ball Screw Support Bearings NSKHPS BSBD Series Modern machine tools require ball screws that can accurately position a work piece or machine component, quickly and efficiently. The BSN / BSF range of bearings are support bearings designed to specifically meet these demanding requirements. The double row configuration, with a 60o contact angle, enables the bearings to support large axial forces in both directions, while providing the accuracy and stiffness required by modern high precision machinery. The bearings are supplied sealed, greased for life and ready for installation. The bearings can...

Types NSKHPS BSBD series is available for both housing mounting (BSN type) and face mounting (BSF type) with through holes for easy mounting. All types are greased for life and equipped with low friction contact lip seals with triple lip structure, achieving high grease retention and dust-proof performance while allowing high speeds. Heavy series A heavy series type is available on some sizes. This type has the same inner ring dimensions, but a larger ball size and outer ring diameter, allowing higher axial loads and stiffness. Fig 1. Comparison of dynamic load rating. Unit: kN Fig 2. Comparison...

Matched Pairs If higher load capacities and/or stiffness are requested, a matched pair (DT) version can be ordered. A “V” is marked on the outer diameter surfaces of the bearings for proper matching and alignment. Matching surfaces are adjusted in order to control preload of each individual bearing. In case of pairs of the BSF series, the number and position of the through holes are different, please refer to the tables on page 12-13 for details. Fixing Bolts * In order to cope with the high loads applied to the ball screw support bearings, especially in those cases with belt driven ball screws...

Series (Ball Screw Support) No symbol: single bearing DT: paired bearing F: Face mounting N: No face mounting (housing) Class 2 running accuracy Special exterior dimensions Outer diameter Seal type Enables bearings to support large axial forces Supports axial load in two directions Contact lip seal (seal runs in inner ring groove) Provides excellent sealing characteristics, with low friction and heat generation Greased for life (under normal operating conditions) Relubrication facilities Enables relubrication of bearing during operation if required Mounting holes (BSF only) Easy mounting of bearing,...

Design of Shaft & Housing It is of utmost importance that shafts and housings are accurately and precisely mated in order to take full advantage of the precision bearings’ capabilities, which include rotational accuracy and low heat generation. When the inner ring or outer ring is mounted onto a shaft or into a housing with some interference, the shape of shaft or housing (out of roundness) is transferred to the bearing raceway surfaces and affects running accuracy. The mating parts should be very accurate BSBD Type * Heavy seri

Static Load and Limiting Axial Load Basic Static Load Ratings Fig. 1 The relation between indentations and Basic Static Load Rating When subjected to an excessive load or a strong shock load, rolling bearings may incur a local permanent deformation of the rolling elements and raceway surface if the elastic limit is exceeded. The elastic deformation increases in area and depth as the load increases, and when the load exceeds a certain limit, the smooth running of the bearing is impeded. In ISO the basic static load rating is defined as that static load which produces the following calculated contact...

BSN Type The BSN Type bearings are double row, angular contact thrust ball bearings, with a 60° contact angle. They are equivalent to two single row bearings in a back-to-back arrangement, with a single outer ring. Bearings are supplied ready to be mounted. They come greased with long life lithium soap grease, with synthetic hydrocarbon base oil as well as mineral oil. Under normal operating conditions, the bearings are greased for life. A relubrication groove located on the outside surface of the outer ring allows the bearings to be relubricated during operation if required. The bearings are...

BSF Type The BSF Type of bearings is equivalent to the BSN range of bearings, with an extended outer ring, with bolt holes for easy direct mounting. Relubrication holes in outside surface and face of the outer ring allow for relubrication during operation if required. The holes are closed off with set screws. An extraction groove on the outer surface of the outer ring aids removal of the bearing. Bearing Numbers Basic Basic Limiting Axial Fixing screws Dynamic Static Axial Inertia Load Load Rigidity Load(3) (kg·cm2) Rating Rating (N/µm) (kN) Size Quantity (kN) (kN) Limiting Tilting Speed Starting...