Cylindrical Roller Bearings EW Series

Transcription

1 Cylindrical Roller Bearings EW Series

2 The NSK brand, recognised around the world From home appliances, automobiles, and capital equipment to the aerospace industry NSK bearings are used in an extensive range of applications. NSK established its globalscale enterprise on technology that has met the exact requirements of global industry. We have also established R&D systems and support services to meet the diverse needs of our customers in every continent. As a brand recognised around the world NSK continues to lead industry with its technical prowess. NSK is on the move, across the globe HEADQUARTERS America (North and South) Ann Arbor Asia Shanghai Singapore Europe Maidenhead Japan Tokyo TECHNICAL OFFICES America (North and South) Ann Arbor Asia Kunshan Europe Newark Kielce Japan Fujisawa Maebashi PLANTS America (North) Ann Arbor Clarinda Franklin Liberty Bennington America (South) Suzano Asia Kunshan Anshun Dongguan Zhangjiagang Suzhou Changshu Chennai Jakarta Changwon Balakong Chonburi Chachoengsao Europe Peterlee Newark Kielce Munderkingen Torino Japan Fujisawa Hanyu Otsu Konan Takasaki Haruna Maebashi Tanakura Ukiha SALES OFFICES Africa Johannesburg America (North) Ann Arbor Indianapolis Chicago San Jose Los Angeles Bennington Miami Atlanta Montreal Toronto Vancouver America (South) Buenos Aires Sao Paulo Belo Horizonte Joinville Porto Alegre Recife Mexico City Asia Beijing Shanghai Guangzhou Anshun Chengdu Hong Kong Taipei Taichung Tainan Seoul Chennai Jakarta Manila Bangkok Kuala Lumpur Prai Johor Bahru Kota Kinabalu Singapore Europe Maidenhead Newark Coventry Paris Dusseldorf Stuttgart Leipzig Milano Barcelona Warsaw Istanbul Japan Tokyo Osaka Nagoya Oceania Melbourne Sydney Brisbane Adelaide Perth Auckland 27 other offices 2

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4 EW Series Design concept of our newly developed standard bearing - the EW series A newly developed standard bearing Roller guide face Internal design comparison of the W series and EW series W Series EW Series (Newly developed type) Outer ring Rollers High load rating Greater number of larger rollers Cage Inner ring Higher limiting speed Maximum rigidity and low noise Optimum and well-balanced design 4

5 NEW CONCEPT NSK has been supplying a standard cage for smaller-sized, single row cylindrical roller bearings as indicated here: Standard bearings: W type (Pressed steel cage with flaps) High load-carrying E type: ET type (Polyamide resign cage) In the 21st century, you can now take advantage of NSK s newly developed cylindrical roller bearing, the EW series, which combines the strengths and technologies of previous cages into a one-piece steel cage. NSK has achieved a new design involving even newer concepts, while maintaining excellence in function and service life. Our EW series can meet your high load-carrying capacity needs for the new era. EW Series Bearing Interchange Guide W EW 5

6 Results of FEM analysis EW Series Conventional W Series Tests confirm that the stress levels of NSK s EW series cages are 40% lower than that of cages in conventional W Series. Cage strength test results EW Competitor Number of oscillations until breakage No breakage and test discontinued EW-1 EW-2 EW-3 EW-4 EW-5 EW-6 EW-7 EW x10 6 x10 7 x10 8 Test conditions Test bearing: NU308 Oscillating angle: 30 Radial load: 7,4 kn Lubrication method: oil bath Oil level NSK s EW series showed greater cage strength performance than that of our major competitors. 6

7 RESULTS Noise measurements test results Noise level, db Measuring conditions Bearing number: NU308 Method: JIS B1548 Radial load: 392 N Speed: min 1 Microphone position and measuring load Microphone diaphragm Speed (min 1 ) Measuring load: 392 N EW Competitor The EW series is 3 to 7 db quieter than that of our major competitors. Higher Limiting Speed Higher Load Rating Limiting speed, db Limiting speed, db Comparison of limiting speed Comparison of dynamic load rating C r Grease Lubrication Bearing number Oil Lubrication Bearing number Bearing number EW W EW W Basic dynamic load rating, N The limiting speed of the EW series is 10-25% higher than that of conventional W series. The load rating of the EW seires is 10-60% higher than that of conventional W series. 7

8 EW Series Bearing Table NU NJ NUP EW series , of NU, NJ, NUP Boundary Dimensions (mm) Basic Load Ratings Limiting Speeds (min 1 ) d D B r r 1 (N) (kgf) F w (min) (min) C r C or C r C or Grease Oil

9 BEARING TABLE Bearing Numbers NU NJ NUP Abutment and Fillet Dimensions (mm) d a d b d c d d D a r a r b (min) (min) (max) (min) (min) (max) (max) (max) Permissible Axial Movement (mm) NU205EW NJ NUP NU305EW NJ NUP NU206EW NJ NUP NU306EW NJ NUP NU207EW NJ NUP NU307EW NJ NUP NU208EW NJ NUP NU308EW NJ NUP NU209EW NJ NUP NU309EW NJ NUP NU210EW NJ NUP NU310EW NJ NUP NU211EW NJ NUP NU311EW NJ NUP NU212EW NJ NUP NU213EW NJ NUP

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