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Long Life Bearings For Engine Accessories

Long Life Bearings For Engine Accessories
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Long Life Bearings For Engine Accessories

Product catalog summary
Introduction
NSK Ltd. has developed next-generation long-life bearings for engine accessories, designed to address premature white structure flaking. These bearings are made with high chrome steel and HAB grease, enhancing their reliability and durability under harsh conditions.

Specifications and Materials
The bearings utilize high chrome steel, which is significantly more durable than conventional materials like SUJ2. SHJ5 steel offers four times the durability, while ES1 steel provides ten times the durability. The bearings are packed with HAB grease, which is more than twice as durable as conventional grease.

Causes and Solutions for White Structure Flaking
White structure flaking is caused by hydrogen intrusion into the bearing steel. NSK has developed preventive measures using HAB grease and high chrome steel to inhibit hydrogen intrusion and diffusion, preventing white etching constituents.

Performance Characteristics
HAB grease, with nanoscale carbon particles, provides electric conductivity and enhances resistance to white structure flaking. It is suitable for environments up to 180°C and contains no harmful substances. High chrome steel ensures excellent dimensional stability and can withstand high temperatures.

Product Variants
NSK offers four types of bearings:
  • Standard specification: SUJ2 with HAB grease for conventional uses.
  • High-temperature specification: SHJ3 with HAB grease for up to 180°C.
  • Long-life specification: SHJ5 with HAB grease for extended life.
  • Ultra long-life specification: ES1 for maximum durability.


Testing and Results
Durability tests show that HAB grease significantly reduces the risk of white structure flaking and seizure. The grease's electric conductivity prevents static electricity buildup, reducing grease decomposition and hydrogen generation.

Conclusion
NSK's long-life bearings offer enhanced durability and reliability, addressing white structure flaking challenges through advanced materials and innovative grease technology.

Material Specifications
High chrome steel improves wear resistance, reduces tribo-chemical reactions, inhibits hydrogen intrusion/diffusion, and stabilizes carbides and base structures.

Test Results
  • Durability Tests: SHJ5 and ES1 materials show longer life and higher durability against seizure compared to SUJ2.
  • White Structure Flaking Durability: SHJ5 and ES1 materials exhibit longer operational lives due to abrasion resistance and stabilized structures.
  • Hydrogen Diffusion: High chrome steel demonstrates strong hydrogen trapping, resulting in slower diffusion and reduced accumulation in stress areas.
  • Seizure Durability: HAB grease with high chrome steel shows improved resistance to seizure.


Key Findings
  • High chrome steel significantly improves wear resistance and durability for engine accessory bearings.
  • The material's ability to inhibit hydrogen diffusion and stabilize carbides enhances performance.
  • SHJ5 and ES1 materials outperform SUJ2 in various tests, indicating their suitability for long-life applications.


Conclusion
High chrome steel in bearings for engine accessories offers improved durability and resistance to issues like white structure flaking and seizure, making it a superior choice for long-life applications.
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Catalog excerpts

Long Life Bearings For Engine Accessories-1

Long-Life Bearings for Engine Accessories Our next-generation bearings for engine accessories—highly reliable and durable against premature white structure aking. Worldwide Sales Ofces NSK Ltd.-Headquarters, Tokyo, Japan www.nsk.com Overseas CS Department tel: 03-3779-7680 Asia Business Strategic Division-Headquarters tel: 03-3779-7121 Africa South Africa: NSK South Africa (Pty) Ltd. Johannesburg Asia and Oceania Australia: NSK Australia Pty. Ltd. www.nskaustralia.com.au tel: (03) 9764-8302 Melbourne China: NSK Hong Kong Ltd. Hong Kong tel: 2739-9933 Kunshan NSK Co., Ltd. tel: 0512-5771-5654 Kunshan Guizhou HS NSK Bearings Co., Ltd. tel: 0853-3521505 Anshun NSK (Shanghai) Trading Co., Ltd. tel: 021-6209-9051 Shanghai NSK Representative Ofces www.nsk.com.cn tel: 010-6590-8161 Beijing Shanghai tel: 21-6209-9051 tel: 020-8732-0583 Guangzhou Anshun tel: 0853-3522522 NSK (China) Investment Co., Ltd. tel: 021-6209-9051 Shanghai India: Rane NSK Steering Systems Ltd. tel: 04114-266002, 265313, 265363, 265365 Chennai NSK Representative Ofce tel: 044-2433-4732, 044-2434-3066, 3067 Chennai Indonesia: PT. NSK Bearings Manufacturing Indonesia Jakarta Plant tel: 021-898-0155 PT. NSK Indonesia Jakarta tel: 021-252-3458 Korea: NSK Korea Co., Ltd. www.nsk.co.kr Seoul tel: 02-3287-0300 Changwon Plant tel: 055-287-6001 Malaysia: NSK Bearings (Malaysia) Sdn. Bhd. Kuala Lumpur tel: 03-77223373 NSK Micro Precision (M) Sdn. Bhd. Malaysia Plant tel: 03-961-6288 New Zealand: NSK New Zealand Ltd. www.nsk-rhp.co.nz tel: (09) 276-4992 Auckland Philippines: NSK Representative Ofce Manila tel: 02-759-6246 Singapore: NSK International (Singapore) Pte Ltd. tel: (65) 6273 0357 Singapore NSK Singapore (Pte) Ltd. tel: (65) 6278 1711 Singapore Taiwan: Taiwan NSK Precision Co., Ltd. Taipei tel: 02-2591-0656 Thailand: NSK Bearings (Thailand) Co., Ltd. tel: 02-6412150~58 Bangkok NSK Bearings Manufacturing (Thailand) Co., Ltd. tel: (038) 454010~454016 Chonburi SIAM NSK Steering Systems Co., Ltd. tel: (038) 522-343~350 Chachoengsao Europe NSK Europe Ltd. (European Headquarters) www.eu.nsk.com tel: 01628-509800 Maidenhead, U.K. France: NSK France S.A. tel: 01 30 57 39 39 Paris Germany: NSK Deutschland Gmbh Düsseldorf tel: 02102-481-0 NSK Precision Europe Gmbh Düsseldorf tel: 02102-481-0 NSK Steering Systems Europe Ltd. tel: 0771-79082-277 Stuttgart Neuweg Fertigung Gmbh Munderkingen tel: 07393-540 Italy: NSK Italia S.P.A. Milano tel: 02-995-19-1 Industria Cuscinetti SPA Torino tel: 0119824811 Netherlands: NSK European Distribution Centre B.V. Tilburg tel: 013-4647647 Poland: NSK Europe Ltd. Warsaw Liaison Ofce tel: 022-645-1525, 1526 Warsaw Liaison NSK Iskra S.A. Kielce tel: 041-366-5001 NSK European Technology Center, Poland Ofce Kielce tel: 041-366-5812 Spain: NSK Spain S.A. Barcelona tel: 093-575-4041 Turkey: NSK Bearings Middle East Trading Co., Ltd. tel: 0216-442-7106 Istanbul United Kingdom: NSK Bearings Europe Ltd. tel: 0191-586-6111 Peterlee NSK European Technology Centre tel: 01636-605123 Newark NSK UK Ltd. tel: 01636-605123 Newark NSK Steering Systems Europe Ltd. tel: 024-76-588588 Coventry North and South America NSK Americas, Inc. (American Headquarters) Ann Arbor, Michigan, U.S.A. tel: 734-913-7500 Argentina: NSK Argentina SRL Buenos Aires tel: 11-4762-6556 Brazil: NSK Brasil Ltda. www.br.nsk.com tel: 011-3269-4723 São Paulo Canada: NSK Canada Inc. www.ca.nsk.com Toronto tel: 905-890-0740 Mexico: NSK Rodamientos Mexicana, S.A. de C.V. www.mx.nsk.com tel: 55-301-2741, 55-301-3115, 55-301-4762 Mexico City United States of America: NSK Corporation www.nsk-corp.com Ann Arbor tel: 734-913-7500 Sales Ofces: Ann Arbor, Michigan tel: 734-913-7500 Cerritos tel: 562-926-2975 NSK American Technical Center Ann Arbor tel: 734-913-7500 NSK Precision America, Inc. www.npa.nsk.com Chicago tel: 630-620-8500 NSK Steering Systems America, Inc. www.nastech.nsk.com Bennington, Vermont tel: 802-442-5448 NSK Latin America Inc. www.latinamerica.nsk.com tel: (305) 477-0605 Miami NSK Ltd. has a basic policy not to export any products or technology designated as controlled items by export-related laws. When exporting the products in this brochure, the laws of the exporting country must be observed. Specications are subject to change without notice and without any obligation on the part of the manufacturer. Every care has been taken to ensure the accuracy of the data contained in this brochure, but no liability can be accepted for any loss or damage suffered through errors or omissions. We will gratefully acknowledge any additions or corrections. For more information about NSK products, please contact: Printed on 100% recycled paper. CAT. No.E1256 2004 A-3 Printed in Japan ©NSK Ltd. 2004

 Open the catalog to page 1
Long Life Bearings For Engine Accessories-2

Long-Life Bearings for Engine Accessories How can we solve the problem with white structure aking? Engine accessories for automobiles need ● Positioning and applications of high chrome steel material Long-life bearings White structure aking to be highly durable and reliable. Bearings for engine accessories used under Surface origin-type flaking harsh conditions may generate white structure Sub-surface origin-type flaking Dust-contaminated environments Clean environments White structure origin-type flaking Environments where hydrogen is apt to enter the bearing steel Close-up of white structure...

 Open the catalog to page 2
Long Life Bearings For Engine Accessories-3

Long-Life Bearings for Engine Accessories Mechanism of white structure aking and preventive measures to be taken What are the causes of white structure aking? High surface pressure NSK eliminates the causes of white structure aking. Formation of a new surface at the area of rolling contact Thickness of grease film Prevention of metallic contact by ensuring a solid grease film Newly designed HAB grease and high chrome steel Long-Life Bearings for Engine Accessories Static electricity generated between the pulley and belt discharges between the ball and ring, accelerating the generation of hydrogen,...

 Open the catalog to page 3
Long Life Bearings For Engine Accessories-4

Long-Life Bearings for Engine Accessories HAB grease and high chrome steel ensure long life and resistance to white structure aking. What are the performance characteristics of HAB grease and high chrome steel? Together they ensure unprecedented long life. Four types of bearings for automobile engine accessories Bearing specication Bearing material Current specication Current grease ➀Standard specication ➁High-temperature specication ➂Long-life specication An innovative grease, combined with nanoscale carbon particles, with electric conductivity. HAB grease enables bearing use in environments...

 Open the catalog to page 4

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