OIL SEALS & O-RINGS
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Koyo Oil Seals: Features Koyo O-Rings: Features Koyo Functional Products: Features FEM (Finite Element Method) Analysis
1. Oil Seals Engineering Section
Dimensional Tables
2. O-Rings Engineering Section
Dimensional Tables
3. Ap Appl plic icat atio ion n Examp Example les s of Oil Seals and O-Rings
4. References Engineering Data
5. Request Fo Forms for Oil Seal Design and Production
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Koyo Oil Seals: Features Koyo O-Rings: Features Koyo Functional Products: Features FEM (Finite Element Method) Analysis
1. Oil Seals Engineering Section
Dimensional Tables
2. O-Rings Engineering Section
Dimensional Tables
3. Ap Appl plic icat atio ion n Examp Example les s of Oil Seals and O-Rings
4. References Engineering Data
5. Request Fo Forms for Oil Seal Design and Production
Preface
This catalog lists Koyo oil seals and O-rings, including all items of the dimension series specified in ISO, JIS and JASO (Japanese Automobile Standards Organization) standards. This catalog is also based on knowledge gained from our supply record, experience, expertise, technologies, and research developments that JTEKT and KOYO SEALING TECHNO have acquired in cooperation with customers since its foundation in 1964. A specialty of this new catalog is the comprehensive information, it offers regarding the selection and handling of oil seals and O-rings. Energy-saving, efforts to protect global environment are in great demand, and we make efforts to continue further research and development in response to these. We look forward to receiving your further loyal patronage of Koyo products.
If you have any questions or requests in selecting oil seals, please fill out the Request Forms for Oil Seal Design and Production provided at the end of this catalog and send them by fax to your nearest JTEKT operation.
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The contents of this catalog are subject to change without prior notice. Every possible effort has been made to ensure that the data listed in this catalog is correct. However, we can not assume responsibility for any errors or omissions. Reproduction of this catalog without written consent is strictly prohibited.
Contents ■ Koyo Oil Seals: Features ...................................................................................................
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■ Koyo O-Rings: Features .....................................................................................................
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■ Koyo Functional Products: Features .........................................................................
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■ FEM (Finite Element Method) Analysis ....................................................................
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1. Oil Seals 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9
Nomenclature and functions of seal components ...................... Seal numbering system ............................................................. Seal types .................................................................................. Selection of seal ......................................................................... Shaft and housing design .......................................................... Seal characteristics .................................................................... Handling of seal ......................................................................... Causes of seal failures and countermeasures ........................... Seal dimensional tables (Contents) ...........................................
8 10 11 15 18 22 26 30 35
2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8
Classification of O-ring and backup ring .................................... 88 Numbering systems of O-ring and backup ring .......................... 89 Selection of O-ring ..................................................................... 90 O-ring technical principles ......................................................... 94 Fitting groove design for O-ring .................................................. 96 Handling of O-ring ...................................................................... 98 Typical O-ring failures, causes and countermeasures ............... 99 O-ring dimensional tables (Contents) ........................................ 101
2. O-Rings
3. Application Examples of Oil Seals and O-Rings 3.1 3.2 3.3 3.4 3.5 3.6
Automobile ................................................................................. 138 Motorcycle .................................................................................. 141 Rolling mill roll necks ................................................................. 142 Rolling stock axles ..................................................................... 143 Geared motor ............................................................................. 144 Hydraulic motor .......................................................................... 144
4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8
Rubber-material varieties and properties ................................... 146 SI units and conversion factors .................................................. 148 Shaft tolerance ........................................................................... 152 Housing bore tolerance .............................................................. 154 ˚C -˚F temperature conversion table .......................................... 156 Steel hardness conversion table ................................................ 157 Viscosity conversion table .......................................................... 158 Shaft surface speed – Quick reference diagram – ..................... 159
4. References
5. Request Forms for Oil Seal Design and Production
........... 160
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Features
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Koyo Oil Seals: Features
1. Lightweight, compact, and energy-saving Koyo oil seals offer high sealing performance, while being compact with reduced seal width. They help reduction of machine weight, size, and resource consumption
2. High sealing performance by optimum lip design Koyo oil seals employ a linear-contact lip, which provides proper radial lip load. The lip design ensures excellent sealing performance, low torque, proper flexibility and high allowability for eccentricity.
3. Low heat generation and long service life by highly self-lubricating rubber materials Based on extensive research and experimentation, JTEKT has succeeded in developing seal rubber materials with high self-lubrication performance. These rubber materials show limited chemical changes such as hardening, softening and/or aging. These materials, having excellent durability, can offer long service life with less heat generated even under high-peripheral speed.
4. High sealing performance and long service life by hydrodynamic ribs (Perfect Seal, Helix Seal, Super Helix Seal) The sealing lip has special spiral threads (hydrodynamic ribs) in one or two directions, which drastically improved sealing performance and service life.
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Various oil seals
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Large-size oil seals
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Koyo O-Rings: Features
1. High sealing performance and reliability High sealing performance against water, oil, air, various gases and chemicals.
2. Available in a full lineup of designs and sizes 3. Easy handling
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Various O-rings
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Features
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Koyo Functional Products: Features
JTEKT produces various functional products based on advanced sealing technologies and sophisticated manufacturing expertise acquired through extensive research and development. Koyo functional products are very helpful in improving
machine performance, reducing weight, size, noise and vibration. Consult JTEKT if there is no product in this catalog that exactly matches your requirements--JTEKT can custom-design products.
1. Functional products for automobiles and forklift trucks • Center bearing units • Bearings molded with vibration isolating rubber • Spark-plug tube gaskets • Plastic gear shafts • Pulley units
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Various functional products
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Bonded piston seals for automatic transmissions
