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 ther
2、efrom, is the sole responsibility of the user.” SAE reviews each technical report at least every five years at which time it may be revised, reaffirmed, stabilized, or cancelled. SAE invites your written comments and suggestions. Copyright 2015 SAE International All rights reserved. No part of this
3、publication may be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of SAE. TO PLACE A DOCUMENT ORDER: Tel: 877-606-7323 (inside USA and Canada) Tel: +1 724-776-49
4、70 (outside USA) Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.org SAE values your input. To provide feedback on this Technical Report, please visit http:/www.sae.org/technical/standards/J1604_201512 SURFACE VEHICLE STANDARD J1604 DEC2015 Issued 1976-06 Revised 2015-
5、12 Superseding J1604 JAN1995 Rubber Boots for Drum-Type Hydraulic Brake Wheel Cylinders RATIONALE SAE J1604 JAN1995 was revised to refer to SAE J1703 for the reference brake fluid. 1. SCOPE This SAE Standard covers molded rubber boots used as end closures on drum-type wheel brake actuating cylinders
6、 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 comp
7、osition, 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 qC 2
8、 qC (40 to + 248 qF 3.6 qF). 2. REFERENCES 2.1 Applicable Documents The following publications form a part of this specification to the extent specified herein. The latest issue of SAE publications shall apply. 2.1.1 SAE Publication Available from SAE International, 400 Commonwealth Drive, Warrendal
9、e, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or +1 724-776-4970 (outside USA), www.sae.org. SAE J1601 Rubber Cups for Hydraulic Actuating Cylinders SAE INTERNATIONAL J1604 DEC2015 Page 2 of 6 2.1.2 ASTM Publications Available from ASTM International, 100 Barr Harbor Drive, P.O. Box C7
10、00, West Conshohocken, PA 19428-2959, Tel: 610-832-9585, www.astm.org ASTM D 573 Standard Test Method for Rubber-Deterioration in an Air Oven. ASTM D 1149 Standard Test Method for Rubber Deterioration - Surface Ozone Cracking in a Chamber ASTM D 1415 Standard Test Method for Rubber Property - Intern
11、ational Hardness ASTM D 2240 Standard Test Method for Rubber Property - Durometer Hardness 3. GENERAL REQUIREMENTS 3.1 Workmanship and Finish Boots shall be free from blisters, pinholes, cracks, protuberances, embedded foreign material, or other physical defects, which can be detected by thorough in
12、spection, and shall conform to the dimensions specified on the drawings. 3.2 Marking The 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. 3.3 Packaging Boots shall be packaged to
13、meet requirements specified by the purchaser. 3.4 Sampling The 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 the manufacturer and the purchaser. 4. TEST RE
14、QUIREMENTS 4.1 Resistance to Fluids at Elevated Temperature After 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 in Hardness: 10 to +10 points 4.2 Heat
15、Stroking Test After 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. 4.3 Low Temperature Stroking Test During stroking, as detailed in 5.6, a boot shall not crack or separate from its as
16、sembled position on the cylinder or become loose on the push rod. SAE INTERNATIONAL J1604 DEC2015 Page 3 of 6 4.4 Tension Set Test After being subjected to the tension set test prescribed in 5.7, a boot shall show no more than 75% tension set. 4.5 Heat Resistance Test (Static) After the heat resista
17、nce test, as 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 4.6 Ozone Resistance Test At the end of the 70 h exposure period, as detailed in 5.9, test specimens shall b
18、e removed from the 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 5.1 Test Specimens Specimens prepared for a particular test shall be cut from the same approximate location on d
19、ifferent sample boots. Hardness test specimens shall be prepared to present a flat molded surface to the indentor. 5.2 Test Fluids The brake fluid used for testing shall be the SAE compatibility fluid referenced in SAE J1703. 5.3 Hardness The method of determining rubber hardness shall be as describ
20、ed in ASTM D 1415-88. If agreed on by vendor and purchaser, an alternate procedure, ASTM D 2240-91, may be used. 5.4 Resistance to Fluids at Elevated Temperature 5.4.1 Apparatus Circulating air oven as specified in Section 5 of ASTM D 573-88. Use a screw top, straight sided, round glass jar1, having
21、 a capacity of approximately 250 cm3and inner dimensions of approximately 125 mm in height and 50 mm in diameter, and a tinned steel lid (no insert or organic coating). 5.4.2 Test Specimens A section weighing approximately 3 to 5 g shall be cut from each of two boots. 5.4.3 Procedure The specimens s
22、hall 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. 1Suitable effect on rubber test ja
23、rs (SAE part no. RM-51) and tinned lids (SAE part no. RM-52) can be obtained from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001. SAE INTERNATIONAL J1604 DEC2015 Page 4 of 6 The volume of each specimen shall be determined in the following manner: Weigh each specimen in air (M1)
24、 to the nearest milligram and then weigh the specimen immersed in distilled water2at room temperature (M2). (A Jolly spring balance, adequately shielded from air currents, may be used for making these determinations.) Quickly dip each specimen in alcohol and then wipe dry with a clean lint-free clot
25、h. Two specimens shall be completely immersed in 75 cm3of the test fluid in the glass jar and tightly capped. The jar shall be placed in an oven at 120 qC 2 qC (248 qF 3.6 qF) for a period of 70 h r 2 h. At the end of the heating period, remove the specimens from the oven and allow to cool in the ja
26、r at 23 qC 5 qC (73.4 qF 9 qF) 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. Specimens shall not remain in the alcohol for more than 30 s. After removal from the alcohol and dr
27、ying, 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 displacement after hot fluid immersion. The final volume and hardness of each specimen shall be det
28、ermined within 60 min after rinsing alcohol. 5.4.4 Calculation And Report 5.4.4.1 Volume change shall be reported as a percentage of the original volume. The calculation shall be made as shown in Equation 1: (Eq. 1) where: M1 = Initial mass in air M2 = Initial mass in water M3 = Mass in air after im
29、mersion in test fluid M4 = Mass in water after immersion in test fluid 5.4.4.2 Change in hardness shall be determined and recorded. 5.4.4.3 Examine the specimens for disintegration as evidenced by blisters or sloughing. 5.5 Heat Stroking Test 5.5.1 Apparatus Circulating air oven as specified in Sect
30、ion 5 of ASTM D 573. Stroking fixtures as shown in Figure 1 of SAE J1601 or equivalent. 5.5.2 Test Specimens Two boots shall be used as test specimens. 2A trace of a suitable wetting agent not large enough to significantly affect the specific weight of the water should be added to the distilled wate
31、r to eliminate small air bubbles trapped on the rubber surface during the weighing process. % change in volumeM3M4 M1M2 M1M2-=SAE INTERNATIONAL J1604 DEC2015 Page 5 of 6 5.5.3 Procedure Install two sample wheel cylinder boots on the cylinder for which they are designed, or equivalent. Then mount the
32、 cylinder into the actuator assembly, operating at 1000 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 qC 2 qC (248 qF 3.6 qF). After the actuation of the assembly, it shall be removed from the oven, all
33、owed to cool to room temperature, and the boots examined for flex cracks and general appearance. 5.6 Low Temperature Stroking Test 5.6.1 Apparatus The cold chamber, in which the test specimens are exposed to the low temperature, shall be of sufficient size to contain the apparatus assembled with tes
34、t specimens and so arranged as to permit the operator to check 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 qC (40 to 45.4 qF). Stroking fixture shall be as shown in Figure
35、4 of SAE J1601 or equivalent. 5.6.2 Test Specimens Two boots shall be used as test specimens. 5.6.3 Procedure Install 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
36、40 to 43 qC (40 to 45.4 qF) for 70 h 2 h. Then stroke the boots with the stroking apparatus for six strokes, 30 s apart, without removal from the cold chamber. 5.7 Tension Set Test 5.7.1 Apparatus Circular stretching mandrel having a diameter which will expand by 15% one or the other of the sealing
37、ends attached to the wheel cylinder or to the actuating rod. The mandrel 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
38、 smooth lead-in chamfer to prevent cutting of the rubber and shall itself have a polished machine finish (0.40 Pm 16 Pin AA maximum). Circulating air oven as specified in Section 5 of ASTM D 573. 5.7.2 Procedure a. Measure to the nearest 0.02 mm (0.001 in) the inside diameters of the ends of three s
39、pecimen boots and record. Assemble on stretching mandrels. Place assemblies in the oven and age for 70 r 2 h at 120 qC r 2 qC (248 qF r 3.6 qF). 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.
40、b. Calculate the tension set as a percentage of the original stretch deflection using Equation 2: (Eq. 2) Tension setD2D1D3D1-100u=SAE INTERNATIONAL J1604 DEC2015 Page 6 of 6 where: D1 = Unaged inside diameter of the boot D2 = Aged inside diameter of the boot D3 = Diameter of the stretching mandrel
41、5.7.3 No less than three specimens shall be tested. 5.8 Heat Resistance Test - Static 5.8.1 Apparatus Circulating air oven as specified in Section 5 of ASTM D 573. 5.8.2 Procedure Select two sample boots for the heat resistance test. Determine the initial hardness of the boots as detailed in 5.3. Su
42、spend the test specimens in the oven for 22 h 1 h at 120 qC 2 qC (248 qF 3.6 qF). Remove them from oven, allow to cool at room temperature for 16 to 96 h, then check for hardness and flexibility. 5.9 Ozone Resistance Test 5.9.1 Apparatus The apparatus shall consist of an ozone chamber as described i
43、n 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 volume r5). Stretching mandrel. 5.9.2 Test Specimens Test specimens shall be two boots. 5.9.3 Procedure Assemble the boots on the stretching mandrels (which wil
44、l 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 mandrels to an ozone concentration of 50 mPa 5 mPa by volume at 40 qC 2 qC (104qF 3.6 qF) for 70 h 2 h. 6. NOTES 6.1 Marginal Indicia A change bar (l) loca
45、ted in the left margin is for the convenience of the user in locating areas where technical revisions, not editorial changes, have been made to the previous issue of this document. An (R) symbol to the left of the document title indicates a complete revision of the document, including technical revisions. Change bars and (R) are not used in original publications, nor in documents that contain editorial changes only. PREPARED BY THE SAE HYDRAULIC BRAKE COMPONENTS STANDARDS COMMITTEE
