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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. TO PLACE A DOCUMENT ORDER; +1 724-776-4970 FAX: +1 724-776-0790 SAE WEB ADDRESS http:
3、/www.sae.org Copyright 2002 Society of Automotive Engineers, Inc. All rights reserved.Printed in U.S.A. SURFACE VEHICLE 400 Commonwealth Drive, Warrendale, PA 15096-0001 STANDARD J20 REV. JAN2002 Issued194401 Revised2002-01 Superseding J20 NOV2001 Coolant System Hoses ForewordSections 13.3 to 13.4 w
4、ere removed to be in accordance with military requirements. 1.ScopeThis SAE Standard covers reinforced and flexible hoses intended for use in water and ethylene glycol-based engine-coolant system applications. 2.References 2.1Applicable PublicationsThe following publications form a part of the speci
5、fication to the extent specified herein. Unless otherwise indicated, the latest revision of SAE publications shall apply. 2.1.1SAE PUBLICATIONSAvailable from SAE, 400 Commonwealth Drive, Warrendale, PA 150960001. SAE J1231Formed Tube Ends for Hose Connections and Hose Fittings SAE J1508Hose Clamp Sp
6、ecification SAEJ1610Test Method for Evaluating the Sealing Capability of Hose Connections with a PVT Test Facility SAE J1638Compression Set of Hoses or Solid Discs SAEJ1684Test Method for Evaluating the Electrochemical Resistance of Coolant System Hoses and Materials SAE J2370Geometric Dimensions an
7、d Tolerancing for Curved Hose SAE J2387Dimensions and Tolerances for Coolant System Hoses 2.1.2ASTM PUBLICATIONSAvailable from ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 194282959. ASTM D 380Methods of Testing Rubber Hose ASTM D 395Test Methods for Rubber Property Compression Set ASTM D 412T
8、est Method for Rubber Properties in Tension ASTM D 413Test Methods for Rubber Property Adhesion to Flexible Substrate ASTM D 471Test Method for Rubber Property Effect of Liquids ASTM D 573Test Method for Rubber Deterioration in an Air Oven ASTMD1149Test Method for Rubber Deterioration Surface Ozone
9、Cracking in a Chamber (Flat Specimens) ASTM D 2240Test Method for Rubber Property Durometer Hardness SAE J20 Revised JAN2002 -2- 2.1.3ISO PUBLICATIONAvailable from ANSI, 11 West 42nd Street, New York, NY 10036-8002. ISO 9001Quality systemsModel for quality assurance in design, development, productio
10、n, installation and servicing 2.1.4AUTOMOTIVE INDUSTRY PUBLICATIONAvailable from AIAG, 26200 Lasher Road, Suite 200, Southfield, MI 48034-7100. QS 9000Quality System Requirements 2.2Related PublicationsThe following publications are provided for information purposes only and are not a required part
11、of this document. 2.2.1SAE PUBLICATIONSAvailable from SAE, 400 Commonwealth Drive, Warrendale, PA 15096-0001. SAE J20-1Coolant Hose (Supplement to SAE J20 for Government Use Replacing Part of MS51230) SAE J20-2Coolant HoseNormal Service Type Convoluted, Wire Support Hose (Supplement to SAE J20 for G
12、overnment Use Replacing Part of MS51008) 3.Definitions of Hose Types 3.1SAE 20R1Heavy-duty type for service in heavy-duty application. This type is available in two wall thicknesses as indicated in 6.3. 3.2SAE 20R2Flexible heavy-duty wire embedded type for the same service as SAE 20R1. 3.3SAE 20R3He
13、ater hose for normal service. 3.4SAE 20R4Radiator hose for normal service. 3.5SAE 20R5Convoluted wire supported type for normal service. 3.6Hose Special Designators for SAE 20RXYX Refers to the hose type. Y designators may be used for hoses with special features. Multiple Y designators may be used i
14、f needed. 3.6.1HTThis High Temperature designation is for any hose type, SAE 20R1 to SAE 20R5, which is required to operate in an environment above 125 C. (See Section 11.) 3.6.2ECThis Electrochemical designation is for any hose type SAE 20R1 to SAE 20R5 which is required to have electrochemical res
15、istance as defined by SAE J1684. (See Section 12.) 3.6.3LTThis Low Temperature designation is for any hose type SAE 20R1 to SAE 20R5 which is required to operate in an environment down to 55 C. (See Section 13.) 3.7Hose ClassesCompounds based on different synthetic rubber grades are specified and de
16、signated (see 5.2 for test methods): Class Ahigh-temperature resistant Class Bhigh oil resistant Class Cmedium oil resistant Class D-1low oil resistant, improved service Class D-2low oil resistant, standard service Class D-3low oil resistant, high-temperature resistant, premium service Class Elow oi
17、l resistant, fiber elastomer composite SAE J20 Revised JAN2002 -3- Physical characteristics for each hose class are shown in Table 1. 3.8MarkingThe outer cover will be printed with the designation SAE 20RXY (the X being the hose type and Y any special designator(s) such as “LT”), class, size of the
18、inside diameter in millimeters, hose manufacturers code marking, and any other identification as agreed upon between user and manufacturer/supplier. It is recommended that this marking shall appear on the outer cover of the hose at intervals not greater than 380mm. 3.8.1SMALL ID OR SHORT HOSEIf ther
19、e is insufficient space on the hose for the required marking due to size or configuration, the marking shall be agreed upon by the customer and the manufacturer/supplier. 4.Dimensional RequirementsGeometric Dimensioning and Tolerancing requirements are outlined in SAE J2370. The following requiremen
20、ts are minimal standards: 4.1Tube and Cover ThicknessMinimum thickness shall be 1.6 mm for the tube and 0.8 mm for the cover. NOTEThis requirement does not apply for hoses without distinctive tube and cover construction. TABLE 1COOLANT SYSTEM HOSE ELASTOMERIC MATERIAL, PHYSICAL PROPERTIES SAE Design
21、ation Typical Elastomer Class A Silicone Class B NBR Class C CR Class D1 EPDM Class D2 EPDM Class D3 EPDM Class E EPDM/Fiber Typical Temperature Range, C 55 to 17540 to 10040 to 10040 to 12540 to 12540 to 15040 to 125 Original Properties Durometer, points Shore A55 to 7555 to 7555 to 7555 to 7555 to
22、 7555 to 7565 to 85 Tensile, min, MPa5.58.57.07.05.07.05.0 Elongation, min, %200250200300150300100 Oven Aging Conditions and Change Limits, Hours/C70/17570/10070/10070/12570/125168/15070/125 Durometer, points Shore A+10+15+20+15+15+15+15 Tensile, max %15152020203520 Elongation, max, %40505050506550
23、Oil Immersion Change Limits ASTM No. 3 Oil or IRM 903 (IRM 903 is being phased in to replace ASTM No. 3) Hours/C70/10070/10070/100 Volume, max, %0 to +455 to +25+80 Tensile, max, %402050 Coolant Immersion (Tube only) Change Limits Hours/at Boiling Point707070707016870 Volume, %0 to +400 to +200 to +
24、205 to +205 to +205 to +205 to +20 Durometer, points Shore A10 to +1010 to +1010 to +1010 to +1010 to +1010 to +1010 to +10 Tensile, max, %30202020202020 Elongation, max, %25404050252525 Compression Set C125100100125125125125 70 h, max, %40507575857585 Cold Flexibility (C)(1) 1.LT designator extends
25、 the low temperature flexibility to 55 C. 40404040404040 SAE J20 Revised JAN2002 -4- 4.2Length Tolerance a.Straight HoseUnless otherwise specified by the customer or manufacturer, Commercial Tolerances will be used. See Table 2. b.Curved HoseThe tolerances on arm lengths, measured from end to inters
26、ection of nearest centerline, shall be as shown in Table 3. 4.3General Layout Tolerances, Curved HoseDimensions locating bend intersections and centerline radii are to establish the theoretical design centerline of the hose. Actual outside contour of hose must be held within a total range of 9.6 mm
27、of all planes with respect to theoretical outside contour of hose. For hose check, hose ends should first be placed in theoretical design position before checking (hose may have to be flexed to correct for any distortion caused by handling or during shipment). SAE arm length tolerances shall apply.
28、Tolerances apply to all arm and body lengths in addition to contour tolerances. Dimensions covering more than one arm or body length are reference only and have no tolerances. The wall thickness within bends of a curved hose may differ from the wall thickness of the straight by no more than 33%. Whe
29、n an alignment mark is required for assembly operations, the basic identifier in Figure 1 is recommended: FIGURE 1ALIGNMENT MARK Location of the alignment mark and/or additional information shall be determined by the customer and the manufacturer. 4.4Enlarged EndsWhen the ID of one end of the hose i
30、s enlarged, normally the ID of the enlarged end should not exceed the ID of the rest of the hose by more than 33%. Enlarged ends should be considered arm lengths for tolerance purposes. The wall thickness normally changes with enlarged ends. TABLE 2LENGTH TOLERANCE Length mm Precision Tolerance mm C
31、ommercial Tolerance mm 03003.2+9.73.2 3001%+3%1% TABLE 3TOLERANCE ON ARM LENGTH Arm Length mm Precision Tolerance mm Commercial Tolerance mm 0300.04.06.4 300.1610.04.87.2 610.1910.06.49.7 910.11220.09.711.2 1220.11830.012.715.9 over 18301%2% SAE J20 Revised JAN2002 -5- 4.5End SquarenessAll points on
32、 the hose end surface must lie within a tolerance zone consisting of two parallel planes perpendicular to the hose axis. The tolerance zone is determined by Table 4. 4.6Finish and Roundness on ConnectionsUsers of coolant hose should take every precaution to obtain connections as smooth and round as
33、practical. (Reference SAE J1231) 4.7ClampsRefer to SAE J1508 for available clamp types. 5.Physical Test Requirements and Procedures 5.1Finished Product 5.1.1ADHESION. When applicable, use test procedure ASTM D 413. The minimum requirement is 1400 N/m between all elastomer or elastomer-coated plies.
34、5.1.2COLD FLEXIBILITY. The following procedure shall be used: For hose 25.4 mm ID and smaller, specimen shall consist of a complete hose of length sufficient to perform bend test described as follows: the hose shall be placed in a cold box for 5 h at the temperature specified in Table 1. The hose sh
35、all then be flexed in the cold chamber through 180 degrees from the centerline to a diameter of ten times the maximum outside diameter of the hose within 4 s. The hose shall not fracture and shall not show any cracks or breaks in the tube or cover. For hose larger than 25.4 mm ID, specimens are to b
36、e 25.4 mm long sections of the complete hose. The specimen and test fixture shall be placed in a cold box for 5 h at the temperature specified in Table 1. The specimen is then compressed to 50% of its original inside diameter between parallel plates within 4 s. The specimen shall not crack or break.
37、 The testing fixture shall be in the cold box during the entire test. NOTE For LT hose, refer to Section 13 for specific cold flexibility requirements. 5.1.3OZONE TEST AND REQUIREMENTS. The following test and requirements apply: When applicable, use test procedure ASTM D 1149. For hose 25.4 mm ID an
38、d smaller, a specimen of hose of sufficient length shall be bent around a mandrel with an outside diameter equal to eight times the specified OD of the sample. The two ends shall be tied at their crossing with enameled copper or aluminum wire. After mounting, the specimen shall be allowed to rest in
39、 an ozone-free atmosphere for 24 h at standard laboratory test temperature. The mounted specimen shall be placed in a test chamber containing ozone at a partial pressure of 50 mPa 5 mPa at a temperature of 40C 1 C. After 100 h of exposure, the specimen shall be removed and allowed to cool to standar
40、d laboratory test temperature and then be inspected visually under 7X magnification. The sample must not show any cracks except for the area immediately adjacent to the wire, which shall be ignored. TABLE 4END SQUARENESS Hose IDPrecision ToleranceCommercial Tolerance 25.4 mm and larger10% of ID15% o
41、f ID smaller than 25.4 mm2.54 mm3.75 mm SAE J20 Revised JAN2002 -6- For hose larger than 25.4 mm ID, prepare a specimen by cutting a strip of the whole hose 12.7 mm x 100mm and tie specimen (cover out) around a 12.7 mm diameter mandrel. Condition in the same manner as specified previously for the wh
42、ole hose and apply the same conditions and requirements. This test applies to the cover only and cracks in the exposed tube or cut edges of the cover shall be ignored. 5.1.4KINK TEST. This test applies to SAE 20R3 hose only. (Not recommended for formed hoses.) 5.1.4.1Test Procedure. Condition specim
43、en length of hose at standard laboratory test temperature for at least 2h. Measure the minimum OD at the approximate center of the specimen length. When a sufficient length of hose is available, it is permissible and suggested that a length in excess of the specimen length be used in an effort to mi
44、nimize the handling variable and overbending. Insert one end of the hose into one hole of the specified test fixture, carefully bend the hose (in direction of natural curvature) and insert the other hose end into the second test fixture hole. Do not overbend or bend hose with sharp motion to prevent
45、 excessive kinking or collapse. Within 30 s, measure the minimum diameter at the point of greatest collapse. 5.1.4.2Test Fixture. Shall consist of 25.4 mm thick flat plate drilled with holes not to exceed the hose OD by more than 1.6 mm and separated by the specified center distances. 5.1.4.3Test Re
46、quirements. See Table 5. 5.1.5VACUUM COLLAPSE TEST. When practical, the entire hose shall be tested as specified in Tables 6A and 6B. The minimum outside diameter shall decrease by no more than 20% during application of vacuum for 15 s and not to exceed 30 s. 5.1.6BURST. This test shall be performed
47、 on a straight length of hose in accordance with ASTM D 380 to meet the requirement in Tables 6A and 6B. For curved 20R3 and 20R4 hose, the same reference applies, except that the test shall be performed on the individual curved hose with one end free and unrestrained and the rate of application of
48、pressure shall be not less than 2.0 MPa nor more than 7.0 MPa/min. The aged burst requirement (11.2.2) will apply to all HT hoses. 5.1.7PRESSURE VIBRATION AND TEMPERATURE OR PRESSURE AND TEMPERATURE TEST. This test shall be used when agreed upon between customer and manufacturer/supplier, using SAE
49、J1610 as the referenced test method. If required, test limits can be modified if agreed upon by the customer and manufacturer/supplier. TABLE 5KINK TEST REQUIREMENTS FOR SAE 20R3 HOSE Nominal Hose ID mm Specimen Length mm Center Distance mm Collapse of Hose Allowed, % 15 and larger24 x ID10 x ID25 smaller than 1524 x ID 8 x ID25 SAE J20 Revised JAN2002 -7- TABLE 6ABURST AND VACUUM VALUES (20R1 AND 20R2) Nomi