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EM-EW SERIES CYLINDRICAL ROLLER BEARINGS

EM-EW SERIES CYLINDRICAL ROLLER BEARINGS
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EM-EW SERIES CYLINDRICAL ROLLER BEARINGS - 1

MOTION & CONTROL™ CYLINDRICAL ROLLER BEARINGS

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EM-EW SERIES CYLINDRICAL ROLLER BEARINGS - 2

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. 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 various industrial sectors. In this context,...

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EM-EW SERIES CYLINDRICAL ROLLER BEARINGS - 3

Partnership based on trust – and trust based on quality Total Quality by NSK: The synergies of our global network of NSK Technology Centres. Just one example of how we meet our requirements for high quality. NSK is one of the leading companies with a long tradition in patent applications for machine parts. In our worldwide research centres, we not only concentrate on the development of new technologies, but also on the continual improvement of quality based on the integrated technology platform of tribology, material technology, analysis and mechatronics. More about NSK at www.nskeurope.com...

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Cylindrical Roller Bearings 4

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EM-EW SERIES CYLINDRICAL ROLLER BEARINGS - 5

NSK cylindrical roller bearings can be used in all applications requiring a high radial load as well as easy assembly. Both bearing rings can, if necessary, be fitted tightly. Cylindrical roller bearings have a high radial load capacity and are suitable for high speeds. The modified design of the rolling contacts helps to avoid harmful edge stresses. Cylindrical roller bearings are produced in a number of designs depending on the various demands on the bearings during use. The NU-type bearings have two fixed ribs on the outer ring and an inner ring without a rib. Construction type N has two...

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EM-EW SERIES CYLINDRICAL ROLLER BEARINGS - 6

EM + EW Series – Design Concept of our latest developed Standard Bearing EM Series You can now take advantage of NSK’s latest developed cylindrical roller bearing, the EM Series, which combines the strengths and technologies of previous cage designs into a one-piece brass roller-guided cage. NSK has achieved a design involving even newer concepts, while maintaining excellence in function and service life. Our EM Series can meet your high load-carrying capacity needs for the new era. The latest developed Standard Bearing Greater accuracy of the roller guidance achieved through special pocket...

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EM-EW SERIES CYLINDRICAL ROLLER BEARINGS - 7

EW Series NSK has developed a higher load-carrying capacity pressed cage with low noise and superior change strength. Our EW series is a standard cylindrical roller bearing that facilitates interchangeability across the globe, while offering better performance for every application. The latest developed Standard Bearing Roller guide face › Higher limiting speed › Maximum rigidity › Low noise Cylindrical Roller Bearings E Series 7

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EM-EW SERIES CYLINDRICAL ROLLER BEARINGS - 8

Internal Design Guide Maximum rigidity and low noise One-piece cage providing greater accuracy Roller-guided cage achieves lower temperature running and quieter operation Outer ring Rollers Cage High strength and wear resistant cage Well-balanced one-piece design Inner ring Rivets High load rating Greater number of larger rollers M Series M Series 8 EM Series EM Series

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EM-EW SERIES CYLINDRICAL ROLLER BEARINGS - 9

Outer ring High load rating Greater number of larger rollers Rollers Cage Higher limiting speed Inner ring Maximum rigidity and low noise Optimum and well-balanced design W Series W Series EW Series EW Series Cylindrical Roller Bearings E Series 9

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EM-EW SERIES CYLINDRICAL ROLLER BEARINGS - 10

EM Series – Results of FEM Analysis Tests confirm that the stress levels of EM series cages are 50% lower than M Series. EM Series M Series Maximum stress: 110 MPa Maximum stress: 210 MPa Cage strength test results EM-1 EM Series 1 EM-2 EM Series 2 M-1 M Series 1 M-2 M Series 2 30° Oil level x10 6 Number of oscillations until breakage Number of oscillations until rivets loosen No breakage and test discontinued x107 x10 8 Test conditions Test bearing: Oscillation angle: Radial load: Lubrication method: The tests confirm the EM series cages performance and strength. 10 NU308 30º 7,4 kN Oil bath

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EM-EW SERIES CYLINDRICAL ROLLER BEARINGS - 11

Schallpegel dB (A) 80 M stegvernieteter Messingmassivkäg des Wettbewerbs 70 EM 60 80 1 200 Noise measurement test results 80 M 1 500 1 80 0 Drehzahl (min–1) Microphone position and measuring load 70 EM 60 60 0 stegvernieteter Messingmassivkäg des Wettbewerbs 10 Noise level dB (A) 11 200 200 1 500 1 500 Speed (min–1) 1 800 1 800 Measuring load: 392 N Measuring conditions Bearing number: NU308 Method: JIS B1 548 Radial load: 392 N Speed: 1 200 to 1 800 min–1 Drehzahl (min–1) The EM series exhibited noise levels 5 dB lower than two-piece cage designs. Higher Load Rating Comparison of dynamic...

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EM-EW SERIES CYLINDRICAL ROLLER BEARINGS - 12

EW Series – Results of FEM Analysis Tests confirm that the stress levels of NSK’s EW series cages are 40% lower than that of cages in conventional W Series. W Series EW Series Cage strength test results EW-1 EW Series 1 EW-2 EW Series 2 EW-3 EW Series 3 EW-4 EW Series 4 EW-5 EW Series 5 EW-6 EW Series 6 EW-7 EW Series 7 EW-8 EW Series 8 1 Oil level W Series 1 2 30° W Series 2 W Series 3 W Series 4 3 4 EW-1 5 EW-1 EW-2 6 EW-2 EW-3 7 EW-3 EW-4 8 EW-4 EW-5 EW-5 W-1 EW-6 EW-6 W-2 EW-7 EW-7W-3 EW-8 EW-8W-4 W-5 1 1 12 W-6 2 2 W-7 3 Number of oscillations W Series 5 W Series 6 until breakages No...

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EM-EW SERIES CYLINDRICAL ROLLER BEARINGS - 13

80 Noise measurements test results 80 EW Microphone position and measuring load EW EW W Wettbewerber 10 Noise level, dB 1800 70 1800 0 Mircophone diaphragm 45° Schallpegel, dB Wettbewerber 70 Measuring load: 392 N EW Measuring load: 392 N Wettbewerber 60 60 1 200 1 500 1500 Speed (min–1) 1200 1 800 1800 Drehzahl, rpm Measuring conditions Bearing number: NU308 Method: JIS B1548 Radial load: 392 N Speed: 1 200–1 800 min–1 The EW Series is 3 to 7 dB quieter than W series. Higher Limiting Speed Higher Load Rating Comparison of limiting speed Comparison of dynamic load rating Cr 18 000 Limiting...

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