SAE J2310-1999 Rectangular Cross Section Polymeric Sealing Rings (Metric).pdf
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1、SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising therefr
2、om, is the sole responsibility of the user.” SAE reviews each technical report at least every five years at which time it may be reaffirmed, revised, or cancelled. SAE invites your written comments and suggestions. QUESTIONS REGARDING THIS DOCUMENT: (724) 772-8512 FAX: (724) 776-0243 TO PLACE A DOCU
3、MENT ORDER: (724) 776-4970 FAX: (724) 776-0790 SAE WEB ADDRESS http:/www.sae.org Copyright 1999 Society of Automotive Engineers, Inc. All rights reserved.Printed in U.S.A. SURFACE VEHICLE 400 Commonwealth Drive, Warrendale, PA 15096-0001 RECOMMENDED PRACTICE Submitted for recognition as an American
4、National Standard J2310 ISSUED JAN1999 Issued1999-01 Rectangular Cross Section Polymeric Sealing Rings (Metric) 1.Scope The purpose of this SAE Recommended Practice is to establish guidelines for the automatic transmission and hydraulic systems Engineer to design rectangular cross section seals for
5、rotating and static grooved shaft applications. Also included are material property comparisons of polymeric materials suitable for these applications. Material covered in this document is not intended to include aluminum applications. 2.References 2.1Applicable Publications The following publicatio
6、ns form a part of this specification to the extent specified herein. Unless otherwise indicated, the latest issue of SAE publications shall apply. 2.1.1SAE PUBLICATION Available from SAE, 400 Commonwealth Drive, Warrendale, PA 15096-0001. SAE J1236 Cast Iron Sealing Rings (Metric) SAE Technical Pape
7、r 980734 Improving Automatic Transmission Quality with High Performance Polyimide Rotary Seal Rings 2.1.2ASTM PUBLICATIONS Available from ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959. ASTM D 648 Test Method for Deflection Temperature of Plastics Under Flexural Load ASTM D 695 Test M
8、ethod for Compressive Properties of Rigid Plastics ASTM D 696 Test Method for Coefficient of Linear Thermal Expansion of Plastics ASTM D 792 Test Method for Specific Gravity (Relative Density) and Density of Plastics by Displacement ASTM D 1708 Test Method for Tensile Properties of Plastics by Use o
9、f Microtensile Specimens ASTM E 228 Test Method for Linear Thermal Expansion of Solid Materials with a Vitreous Silica Delatometer 3.Materials Polymeric sealing rings are made from various materials as described in the following paragraphs. These base polymer materials may be compounded with a varie
10、ty of filler types to achieve specific performance properties such as increased resistance to wear, fluids, and temperature. Other desirable properties include reduced abrasion of mating components, reduced friction, increased strength, and resistance to damage. Examples of fillers include: glass, g
11、raphite, brass, and various polymers. Factors to be considered when choosing a material include: application temperature, fluid type, contaminant exposure, configuration (solid or split), and assembly issues. It is suggested that a seal material supplier be consulted during the selection process. SA
12、E J2310 Issued JAN1999 -2- 3.1P.T.F.E. (Polytetrafluoroethylene) These materials are normally sintered from powders which have been compacted/molded to specific sizes under extreme pressure. The materials are sintered to promote specific mechanical properties, crystallinity, and shape memory. The si
13、ntered materials are then cut into rings of specific dimensions, and can be split or left as a solid ring depending on assembly and functional requirements. Solid rings must be stretched to install over the shaft diameter. If stretched, then a subsequent sizing operation may be required depending on
14、 the recovery rate of the material. 3.2Polyimide These materials are typically compression molded into the desired size and shape. Polyimide rings have a higher modulus than P.T.F.E. and also provide higher strength and tolerance to deformation under pressure. Due to the high modulus of Polyimide, t
15、hese rings must be split to install over the shaft diameter. 3.3P.E.E.K. (Polyetheretherketone) These materials are typically injection molded into the desired size and shape, or they are extruded and then finished by machining. P.E.E.K. properties are similar to Polyimide. P.E.E.K. rings will also
16、require a split configuration due to its high modulus and relative rigidity. 3.4Comparison of Materials Physical Properties (Table 1) Physical properties listed are typical approximate values for reference only. Actual physical properties will vary significantly depending on types and amounts of fil
17、ler materials. (Contact material supplier for details related to a specific material formulation). 4.Application Design Data The four configurations shown in Figures 1 to 4, are the most common. Other joint configurations are in use to solve specific applications issues. FIGURE 1 SOLID RING TABLE 1
18、COMPARISON OF MATERIALS PHYSICAL PROPERTIES ASTM Test #UnitsP.T.F.E.PolymideP.E.E.K Max. Use Temp. (No Load)NAC288260250 Heat Deflect Temp. (455 kPa)D 648C121NANA Heat Deflect Temp. (1.82 MPa)D 648C56360167 Coef. of Linear Expans (D 696)E 22810E-5/K7.52.75.52.27.4 Ultimate ElongationD 1708%2503502.5
19、5.51.33.5 Specific GravityD 792NA2.12.31.421.561.441.48 Compressive StrengthD 695MPa1224220150 Coefficient of FrictionNANA0.050.130.08 0.120.110.16 SAE J2310 Issued JAN1999 -3- FIGURE 2 SPLIT RING STRAIGHT CUT FIGURE 3 SPLIT RING STEP JOINT FIGURE 4 SPLIT RING SCARF CUT SAE J2310 Issued JAN1999 -4-
20、4.1Axial Width (W) (The widths shown in Table 2 are considered “common” sizes). The axial widths for polymeric sealing rings are dependent on the expected application pressure, and are calculated using the physical properties of the finished seal materials. Consult the seal ring manufacturer for spe
21、cific applications. The values listed in Table 2 indicate a 0.08 mm minimum axial clearance between seal and groove width. This amount of clearance is intended for solid, straight cut, and step joint configurations. Scarf cut seals will require a greater amount of side clearance to prevent interfere
22、nce caused by “ramping” at joint location. 4.2Radial Wall Thickness (T) It is recommended that sealing ring radial wall thickness not exceed the axial width shown in Table 2. Radial wall thickness (T) typically should be 90% of the axial width for proper function, ease of assembly, and to minimize t
23、he required groove depth. (See 4.8.) 4.3End Clearance or Compressed Gap (G) (Refer to Figure 5) This dimension is measured with seal ring installed inside a minimum diameter bore or ring gauge at room temperature. Consult a ring manufacturer for the upper limit since this dimension can affect cost a
24、nd performance. The lower limit is calculated based on thermal expansion of the seal and bore. 4.3.1P.T.F.E. SEALS Minimum gap should be zero at room temperature for all joint types. 4.3.2POLYIMIDE AND P.E.E.K. SEALS The minimum gap should approach zero at maximum operating temperature to minimize l
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