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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 1995 Society of Automotive Engineers, Inc. All rights reserved.Printed in U.S.A. SURFACE VEHICLE 400 Commonwealth Drive, Warrendale, PA 15096-0001 STANDARD Submitted for recognition as an American National Sta
4、ndard J1604 REV. JAN95 Issued1976-06 Revised1995-01 Superseding J1604 OCT89 (R) RUBBER BOOTS FOR DRUM-TYPE HYDRAULIC BRAKE WHEEL CYLINDERS 1.ScopeThis SAE Standard covers molded rubber boots used as end closures on drum-type wheel brake actuating cylinders to prevent the entrance of dirt and moistur
5、e, which could cause corrosion and otherwise impair wheel brake operation. The document includes performance tests of brake cylinder boots of both plain and insert types under specified conditions and does not include requirements relating to chemical composition, tensile strength, or elongation of
6、the rubber compound. Further, it does not cover the strength of the adhesion of rubber to the insert material where an insert is used. The rubber material used in these boots is classified as suitable for operation in a temperature range of 40 to +120 C 2 C (40 to + 248 F 3.6 F). 2.References 2.1App
7、licable PublicationsThe following publications form a part of this specification to the extent specified herein. The latest issue of SAE publications shall apply. 2.1.1SAE PUBLICATIONAvailable from SAE, 400 Commonwealth Drive, Warrendale, PA 15096-0001. SAE J1601Rubber Cups for Hydraulic Actuating C
8、ylinders 2.1.2ASTM PUBLICATIONSAvailable from ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959. ASTM D 573Standard Test Method for Rubber-Deterioration in an Air Oven. ASTM D 1149Standard Test Method for Rubber DeteriorationSurface Ozone Cracking in a Chamber ASTM D 1415Standard Test Me
9、thod for Rubber PropertyInternational Hardness ASTM D 2240Standard Test Method for Rubber PropertyDurometer Hardness 3.General Requirements 3.1Workmanship and FinishBoots shall be free from blisters, pinholes, cracks, protuberances, embedded foreign material, or other physical defects, which can be
10、detected by thorough inspection, and shall conform to the dimensions specified on the drawings. 3.2MarkingThe identification mark of the manufacturer as recorded by the Rubber Manufacturers Association, and other details, as specified on drawings, shall be molded into each boot. SAE J1604 Revised JA
11、N95 -2- 3.3PackagingBoots shall be packaged to meet requirements specified by the purchaser. 3.4SamplingThe minimum lot on which complete specification tests shall be conducted for quality control testing, or the frequency of any specific type test used to control production, shall be agreed on by t
12、he manufacturer and the purchaser. 4.Test Requirements 4.1Resistance to Fluids at Elevated TemperatureAfter being subjected to the test for resistance to fluids at elevated temperatures, as prescribed in 5.4, a boot shall conform to the following requirements: a.Change in Volume: 10 to +15% b.Change
13、 in Hardness: 10 to +10 points 4.2Heat Stroking TestAfter stroking, as detailed in 5.5, a boot shall be free of flex cracks which extend through the wall thickness, and shall fit tightly around the cylinder and push rod. 4.3Low Temperature Stroking TestDuring stroking, as detailed in 5.6, a boot sha
14、ll not crack or separate from its assembled position on the cylinder or become loose on the push rod. 4.4Tension Set TestAfter being subjected to the tension set test prescribed in 5.7, a boot shall show no more than 75% tension set. 4.5Heat Resistance Test (Static)After the heat resistance test, as
15、 detailed in 5.8, a boot shall conform to the following requirements: a.No cracking shall occur when flexed similarly to service conditions b.Change in Hardness: 5 to +10 points 4.6Ozone Resistance TestAt the end of the 70 h exposure period, as detailed in 5.9, test specimens shall be removed from t
16、he ozone chamber and examined under 2X magnification. Surface of the test specimens shall show no evidence of cracking, rupture, or other deterioration. 5.Test Procedures 5.1Test SpecimensSpecimens prepared for a particular test shall be cut from the same approximate location on different sample boo
17、ts. Hardness test specimens shall be prepared to present a flat molded surface to the indentor. 5.2Test FluidsThe brake fluid used for testing shall be RM 66-04.1 5.3HardnessThe method of determining rubber hardness shall be as described in ASTM D 1415-88. If agreed on by vendor and purchaser, an al
18、ternate procedure, ASTM D 2240-91, may be used. 1.Obtainable from SAE, 400 Commonwealth Drive, Warrendale, PA 15096-0001. SAE J1604 Revised JAN95 -3- 5.4Resistance to Fluids at Elevated Temperature 5.4.1APPARATUSCirculating air oven as specified in Section 5 of ASTM D 573-88. Use a screw top, straig
19、ht sided, round glass jar2, having a capacity of approximately 250 cm3 and inner dimensions of approximately 125 mm in height and 50 mm in diameter, and a tinned steel lid (no insert or organic coating). 5.4.2TEST SPECIMENSA section weighing approximately 3 to 5 g shall be cut from each of two boots
20、. 5.4.3PROCEDUREThe specimens shall be rinsed in isopropyl or ethyl alcohol and wiped dry with a clean, lint-free cloth to remove dirt and packing debris. Specimens shall not be left in the alcohol for more than 30 s. Determine and record the initial hardness of the test specimens. Refer to 5.3. The
21、 volume of each specimen shall be determined in the following manner: Weigh each specimen in air (M1) to the nearest milligram and then weigh the specimen immersed in distilled water3 at room temperature (M2). (A Jolly spring balance, adequately shielded from air currents, may be used for making the
22、se determinations.) Quickly dip each specimen in alcohol and then wipe dry with a clean lint-free cloth. Two specimens shall be completely immersed in 75 cm3 of the test fluid in the glass jar and tightly capped. The jar shall be placed in an oven at 120 C 2 C (248 F 3.6 F) for a period of 70 h 2 h.
23、 At the end of the heating period, remove the specimens from the oven and allow to cool in the jar at 23 C 5 C (73.4F 9 F) for 60 to 90 min. At the end of the cooling period, remove the specimens from the jar and rinse in isopropyl or ethyl alcohol and wipe dry with a clean, lint-free cloth. Specime
24、ns shall not remain in the alcohol for more than 30 s. After removal from the alcohol and drying, place each specimen in a separate, tared, stoppered weighing bottle and weigh (M3). Remove each specimen from its weighing bottle and weigh it immersed in distilled water3 (M4) to determine water displa
25、cement after hot fluid immersion. The final volume and hardness of each specimen shall be determined within 60 min after rinsing alcohol. 5.4.4CALCULATION AND REPORT 5.4.4.1Volume change shall be reported as a percentage of the original volume. The calculation shall be made as shown in Equation 1: (
26、Eq. 1) where: M1 = Initial mass in air M2 = Initial mass in water M3 = Mass in air after immersion in test fluid M4 = Mass in water after immersion in test fluid 2.Suitable effect on rubber test jars (SAE part no. RM-51) and tinned lids (SAE part no. RM-52) can be obtained from SAE, 400 Commonwealth
27、 Drive, Warrendale, PA 15096-0001. 3.A trace of a suitable wetting agent not large enough to significantly affect the specific weight of the water should be added to the distilled water to eliminate small air bubbles trapped on the rubber surface during the weighing process. % change in volume M3M4(
28、)M1M2() M1M2 - -= SAE J1604 Revised JAN95 -4- 5.4.4.2Change in hardness shall be determined and recorded. 5.4.4.3Examine the specimens for disintegration as evidenced by blisters or sloughing. 5.5Heat Stroking Test 5.5.1APPARATUSCirculating air oven as specified in Section 5 of ASTM D 573. Stroking
29、fixtures as shown in Figure 1 of SAE J1601 or equivalent. 5.5.2TEST SPECIMENSTwo boots shall be used as test specimens. 5.5.3PROCEDUREInstall two sample wheel cylinder boots on the cylinder for which they are designed, or equivalent. Then mount the cylinder into the actuator assembly, operating at 1
30、000 strokes/h with a stroke length of 3.8 mm 1.7 mm (0.15 in 0.07 in). Then place the cylinder assembly in the oven and actuate for 22 h 1 h at 120 C 2 C (248 F 3.6 F). After the actuation of the assembly, it shall be removed from the oven, allowed to cool to room temperature, and the boots examined
31、 for flex cracks and general appearance. 5.6Low Temperature Stroking Test 5.6.1APPARATUSThe cold chamber, in which the test specimens are exposed to the low temperature, shall be of sufficient size to contain the apparatus assembled with test specimens and so arranged as to permit the operator to ch
32、eck and operate it without removal from the chamber. It shall be capable of maintaining a uniform atmosphere of cold dry air within the specified temperature range of 40 to 43 C (40 to 45.4 F). Stroking fixture shall be as shown in Figure 4 of SAE J1601 or equivalent. 5.6.2TEST SPECIMENSTwo boots sh
33、all be used as test specimens. 5.6.3PROCEDUREInstall the sample wheel cylinder boots on the cylinder, for which they are designed, or equivalent. Place the test boots and test apparatus in a cold chamber and expose to a temperature of 40 to 43 C (40 to 45.4 F) for 70 h 2 h. Then stroke the boots wit
34、h the stroking apparatus for six strokes, 30 s apart, without removal from the cold chamber. 5.7Tension Set Test 5.7.1APPARATUSCircular stretching mandrel having a diameter which will expand by 15% one or the other of the sealing ends attached to the wheel cylinder or to the actuating rod. The mandr
35、el diameter is calculated as 115% of the molded diameter of the chosen boot end. The molded diameter shall be calculated from the average of two measurements made at right angles to each other. The mandrel shall be provided with a smooth lead-in chamfer to prevent cutting of the rubber and shall its
36、elf have a polished machine finish (0.40m 16 in AA maximum). Circulating air oven as specified in Section 5 of ASTM D 573. 5.7.2PROCEDURE a.Measure to the nearest 0.02 mm (0.001 in) the inside diameters of the ends of three specimen boots and record. Assemble on stretching mandrels. Place assemblies
37、 in the oven and age for 70 2 h at 120 C 2 C (248 F 3.6 F). Remove the assemblies and cool at room temperature for 1 h. Remove the boots. Allow to recover between 1/2 and 1 h. Again measure the diameter and record. b.Calculate the tension set as a percentage of the original stretch deflection using
38、Equation 2: SAE J1604 Revised JAN95 -5- (Eq. 2) where: D1 = Unaged inside diameter of the boot D2 = Aged inside diameter of the boot D3 = Diameter of the stretching mandrel 5.7.3No less than three specimens shall be tested. 5.8Heat Resistance TestStatic 5.8.1APPARATUSCirculating air oven as specifie
39、d in Section 5 of ASTM D 573. 5.8.2PROCEDURESelect two sample boots for the heat resistance test. Determine the initial hardness of the boots as detailed in 5.3. Suspend the test specimens in the oven for 22 h 1 h at 120 C 2 C (248 F 3.6 F). Remove them from oven, allow to cool at room temperature f
40、or 16 to 96 h, then check for hardness and flexibility. 5.9Ozone Resistance Test 5.9.1APPARATUSThe apparatus shall consist of an ozone chamber as described in ASTM D 1149-91, and shall be capable of maintaining an ozone concentration of 50 mPa 5 mPa (50 parts of ozone/100 million parts of air by vol
41、ume 5). Stretching mandrel . 5.9.2TEST SPECIMENSTest specimens shall be two boots. 5.9.3PROCEDUREAssemble the boots on the stretching mandrels (which will provide 15 + 0, 3% stretch in the boot bead section) and allow to rest for 22 1 h at room temperature, then subject the boots installed on the ma
42、ndrels to an ozone concentration of 50 mPa 5 mPa by volume at 40 C 2 C (104 F 3.6 F) for 70 h 2 h. 6.Notes 6.1Marginal IndiciaThe change bar (l) located in the left margin is for the convenience of the user in locating areas where technical revisions have been made to the previous issue of the repor
43、t. An (R) symbol to the left of the document title indicates a complete revision of the report. PREPARED BY THE SAE HYDRAULIC BRAKE ACTUATING ELASTOMERIC STANDARDS COMMITTEE Tension set D2D1 D3D1 - -100= SAE J1604 Revised JAN95 RationaleSAE J1604 OCT89 was revised to include the most recent referenc
44、e documents and referee materials available at the time of publication and to comply with SAEs five-year review policy. Relationship of SAE Standard to ISO StandardNot applicable. ApplicationThis SAE Standard covers molded rubber boots used as end closures on drum-type wheel brake actuating cylinder
45、s to prevent the entrance of dirt and moisture, which could cause corrosion and otherwise impair wheel brake operation. The document includes performance tests of brake cylinder boots of both plain and insert types under specified conditions and does not include requirements relating to chemical com
46、position, tensile strength, or elongation of the rubber compound. Further, it does not cover the strength of the adhesion of rubber to the insert material where an insert is used. The rubber material used in these boots is classified as suitable for operation in a temperature range of 40 to +120 C 2
47、 C (40 to + 248 F 3.6 F). Reference Section SAE J1601Rubber Cups for Hydraulic Actuating Cylinders ASTM D 573Standard Test Method for Rubber-Deterioration in an Air Oven ASTM D 1149Standard Test Method for Rubber DeteriorationSurface Ozone Cracking in a Chamber ASTM D 1415Standard Test Method for Rubber PropertyInternational Hardness ASTM D 2240Standard Test Method for Rubber PropertyDurometer Hardness Developed by the SAE Hydraulic Brake Actuating Elastomeric Standards Committee