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 theref
2、rom, 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. Copyright 2009 SAE International All rights reserved. No part of this publication ma
3、y 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: 724-776-4970 (outside USA)
4、Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.orgSURFACEVEHICLERECOMMENDEDPRACTICEJ1469 FEB2009 Issued 1988-06Revised 2009-02 Superseding J1469 JUN2006 Air Brake Actuator Test Procedure, Truck-Tractor, Bus, and Trailers RATIONALENew changes addressed requests to incr
5、ease the Salt Spray Requirements, add Vacuum Requirements to Boot Seal Validation, allow longer pressure stabilization times during leak testing, add allowable cooling time between mechanical release test cycles, allow optional 5 Gallon Air Tank reservoir for pressure decay leak testing, standardize
6、 incremental measurements to 5 mm (0.20 in), and add Arctic temperature Leakage and Operational testing to allow the SAE J1450 specification to be suspended or cancelled. 1. SCOPE This SAE Recommended Practice provides procedures and methods for testing service, spring applied parking, and combinati
7、on brake actuators with respect to durability, function, and environmental performance. A minimum of five test units designated A, B, C, D, and E are to be used to perform all tests per 1.1 and 1.2. 1.1 Test Procedures Leak rate-parking and service chambers (Section 4) Chamber volume-parking and ser
8、vice chambers (Section 5) Maximum release and hold-off pressure-parking chamber (Section 6) Minimum Pressure ResponseService Chambers (Section 7) Force output and stroke-parking chamber (Section 8) Force output and stroke-service chamber (Section 9) Low temperature leakage-parking and service chambe
9、rs (Section 10) Low temperature maximum release and hold-off pressure (Section 11) Low temperature force output-parking chamber (Section 12) Low temperature operational test-service chamber (Section 13) Corrosion resistance-parking and service chamber (Section 14) Mechanical back-off release mechani
10、sm (Section 15) Proof pressure test-parking and service chambers (Section 16) Cycle test-parking chamber (Section 17) Cycle test-service chamber (Section 18) Elevated temperature cycle test-parking and service chambers (Section 19) Vibration test (Section 20) Arctic temperature leakage service chamb
11、er (Section 21) Arctic temperature operational test service chamber (Section 22) Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE J1469 Revised FEB2009 Page 2 of 241.2 Test Sequence Chart The test
12、 sequence as charted in the “Test Sequence Chart” shall be mandatory (see Figure 1). 1.3 Purpose This document provides uniform procedures and methods for laboratory testing of brake actuators used in air brake systems. FIGURE 1 - TEST SEQUENCE CHART NO.ABCDEABCDEABCDE4XXXXXXXXXXXXXXX5XXX6XX7XXPark8
13、XXXXXXXXXXService9XXXXXXXXXX10XXX11XX12XX13XX14XXXMechBack-OffRelease(whenapplicable)15XXXX16XXXPark17XXXXXXService18XXXXXX19XXX20XXX21XXX22XXXTESTSFOR COMBINATIONSTESTUNITDESIGNATIONTESTS FORSERVICECHAMBERS ONLYTESTUNITDESIGNATIONTESTS FORPARKING CHAMBER ONLYTESTUNITDESIGNATIONArtic TempLeakageArti
14、cTemp OperationalTestProcedureSectionCorrosionProof PressureElevatedTemp TestVibrationForce Outoutand StrokeCycle TestLeakageRateChamberVolumeMaxReleasethen pneumatically cycle the parking chamber from the fully released to 75% 5% of its rated stroke (75% 5% stroke to zero stroke and back to 75% 5%
15、stroke position) while maintaining 70 C 3 C (158 F 5 F) by applying 0 to 690 kPa 35 to 0 kPa (0 to 100 lbf/in2 5 to 0 lbf/in2) (gage) air pressure at a rate of 6 cycles/min minimum for 22 h. 19.1.3.3 Repeat procedure specified in 19.1.3.2 four times to accumulate a total of 96 h and a minimum of 30
16、000 cycles. 19.1.3.4 After cycling, leak test the parking chamber per 4.1. 19.2 Service Chamber 19.2.1 Conditions 19.2.1.1 Same as those set forth in 19.1.1 except the test units spring chamber is to be caged pneumatically or mechanically during testing (if applicable). 19.2.2 Test Equipment 19.2.2.
17、1 Same as specified in 19.1.2. 19.2.3 Test Procedure 19.2.3.1 Connect the service chamber air port to the pneumatic circuit. 19.2.3.2 Soak test unit for 2 h at 70 C 3 C (158 F 5 F), then pneumatically cycle the service chamber from the fully released to the 75% 5% of its rated stroke position (75% 5
18、% stroke to zero stroke and back to 75% 5% stroke position) while maintaining 70 C 3 C (158 F 5 F) by applying 0 to 690 kPa 35 to 0 kPa (0 to 100 lbf/in2 5 to 0 lbf/in2) (gage) air pressure at a rate of six cycles/min minimum. Copyright SAE International Provided by IHS under license with SAENot for
19、 ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE J1469 Revised FEB2009 Page 20 of 2419.2.3.3 Repeat procedure specified in 19.2.3.2 four times to accumulate a total of 96 h and minimum of 30 000 cycles. 19.2.3.4 After cycling, leak test the service chamber per 4.2. 20.
20、 VIBRATION TEST NOTE: This procedure provides uniform test methods for evaluating “Service” and “Combination” air brake actuators for resistance to vibration fatigue damage. 20.1 Conditions 20.1.1 27 C 11 C (80 F 20 F) ambient temperature. 20.1.2 Pneumatically or mechanically cage the test units spr
21、ing chamber (if applicable). 20.1.3 The brake actuator may be tested with its “pushrod” and “service chamber return spring” removed from the assembly. 20.1.4 If the unit is tested with the “pushrod” and “service chamber return spring” installed, pushrod “tie-down” fixturing shall be employed (see Fi
22、gures 6 and 7). 20.2 Test Equipment 20.2.1 WarningAdequate shielding and/or isolation of the test unit shall be provided during vibration testing to protect operators and all personnel and property in the area of testing. 20.2.2 Vibration equipment capable of providing a sinusoidal acceleration inpu
23、t. 20.2.3 Calibrated equipment capable of monitoring the following parameters: 20.2.3.1 Input acceleration (Peak Gs) 20.2.3.2 Vibration test frequency (Hz) FIGURE 6 - MOUNTING Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted with
24、out license from IHS-,-,-SAE J1469 Revised FEB2009 Page 21 of 24FIGURE 7 - MOUNTING 20.2.3.3 Output acceleration (Gs) or “transmissibility” (ratio of the output acceleration at the test unit versus input acceleration at the axle section or base fixturing). 20.2.3.4 Number of total vibration cycles a
25、ccumulated during testing. 20.2.4 Test fixturing shall consist of the actual chamber mounting bracketry on which the brake actuator is to be employed, or if fabricated fixturing is to be used, the fixturing shall simulate the following characteristics of the actual mounting bracketry: 20.2.4.1 Mount
26、ing surface shape and area. 20.2.4.2 Actuator mounting angularity and positioning 20.2.4.3 “Output acceleration” and “Primary Resonant Frequency” shall simulate that generated with actual vehicle mounting bracketry. 20.3 Test Procedure 20.3.1 Mount the test actuator on the vibration test fixturing u
27、sing the manufacturers recommended mounting hardware and mounting torques (see Figures 6 and 7). Measure and record mounting nut torque prior to testing. 20.3.2 Mount the “drive accelerometer” vertically on the axle beam or base fixturing as shown in Figures 6 and 7. The “monitor accelerometer” is t
28、o be mounted on the top of the test brake actuator as far as possible from the mounting surface. The monitor accelerometer axial centerline is to be perpendicular to the brake actuators axial centerline.20.3.3 Run a sweep test, at 10% maximum of the specified test acceleration, from 20 Hz up through
29、 “primary resonant frequency” (maximum G output or maximum transmissibility) to determine the primary resonant frequency. 20.3.4 The following test parameters shall be specified by the vehicle or actuator manufacturer: 20.3.4.1 Peak “G” input level 20.3.4.2 Test Frequency a. Primary resonant b. Swee
30、p through a frequency range c. Other Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE J1469 Revised FEB2009 Page 22 of 2420.3.4.3 Total required vibration cycles. NOTE: If mounting bracketry/fixtu
31、ring failure occurs prior to completion of the required test cycles with no evidence of brake actuator damage, the fixturing may be replaced and brake actuator testing continued per 20.3.1 to 20.3.4. 20.3.5 Maintain log of the following test parameters: 20.3.5.1 Test frequency (Hz) 20.3.5.2 Input ac
32、celeration (Peak Gs) 20.3.5.3 Output acceleration and/or “transmissibility” 20.3.5.4 Total test cycles accumulated 20.3.6 At test conclusion, cage the units power spring (if applicable) per the actuator manufacturers instructions. Expel air from parking chamber and record the following results: 20.3
33、.6.1 Mounting nut torque 20.3.6.2 Leak test per Section 4. 20.3.6.3 Performance test per Section 8, if applicable. 20.3.7 Disassemble per the actuator manufacturers recommended procedures and inspect all parts and record any abnormal damage or degradation. 21. ARTIC TEMPERATURE LEAKAGE TESTSERVICE C
34、HAMBER 21.1 Leakage, Arctic Temperature Service Chamber 21.1.1 Conditions 21.1.1.1 54 C 1.1 C (65 F 2 F). 21.1.2 Test Procedure 21.1.2.1 Connect the service chamber to a 20 485 cm3 820 cm3(1250 in3 50 in3) air tank. U.S. 5 Gallon Tank acceptable as alternative. Pressurize the air tank to 860 to 900
35、kPa (125 to 130 lbf/in2) (gage). Do not pressurize the parking chamber. 21.1.2.2 Cage the parking chamber mechanically or pneumatically with 860 to 900 kPa (125 to 130 lbf/in2) (gage) to maintain the power spring in the fully caged position (if applicable). 21.1.2.3 Limit stroke of unit to 75% 5% of
36、 rated stroke.21.1.2.4 Soak test unit and pressurized air tank at 54 C 1 C (65 F 2 F) for 16 h minimum. 21.1.2.5 After the low temperature soak is completed, pressurize the service chamber to 860 to 900 kPa (125 to 130 lbf/in2) (gage) with air from the 20485 cm3 820 cm3(1250 in3 50 in3) air tank. U.
37、S. 5 Gallon Tank acceptable as alternative. If the 860 to 900 kPa (125 to 130 lbf/in2) (gage) air pressure cannot be maintained, it is permissible to apply room temperature make-up air21.1.2.6 Stabilize the service chamber and air tank air pressure for 5 min minimum. 21.1.2.7 Establish air pressure
38、at 860 kPa 7 kPa (125 lbf/in2 1 lbf/in2) (gage). Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE J1469 Revised FEB2009 Page 23 of 2421.1.2.8 Measure leakage rate with a flow meter. Record all res
39、ults. 21.1.3 Alternate Test Procedure 21.1.3.1 Connect the service chamber to a 20 485 cm3 820 cm3(1250 in3 50 in3) air tank. U.S. 5 Gallon Tank acceptable as alternative 21.1.3.2 Connect a pressure gage (or equivalent device) to measure pressure change. 21.1.3.3 Pressurize the air tank to 860 to 90
40、0 kPa (125 to 130 lbf/in2) (gage). Perform procedures specified in 21.2.2.2 to 21.2.2.7. 21.1.3.4 Record the pressure change after 10 min 0.1 min. 22. ARTIC TEMPERATURE OPERATIONAL TESTSERVICE CHAMBER 22.1.1 Conditions 22.1.1.1 54 C 1.1 C (65 F 2 F). 22.1.2 Test Procedure 22.1.2.1 Establish zero str
41、oke position of the pushrod relative to a reference surface. Mark the pushrod for stroke measurement required in 13.1.2.9.22.1.2.2 Limit the pushrod stroke to 75% 5% of rated stroke.NOTE: The test fixturing must guide pushrod, when actuated, to maintain perpendicularity to the chamber mounting surfa
42、ce within 1 degree.22.1.2.3 Connect the service chamber to a 20 485 cm3 820 cm3(1250 in3 50 in3) air tank with a three-way air shut-off valve attached between the air port and air tank to enable cycling of the service chamber. U.S. 5 Gallon Tank acceptable as alternative. 22.1.2.4 With the shut-off
43、valve closed, pressurize the air tank to 860 to 900 kPa (125 to 130 lbf/in2) (gage) air pressure.22.1.2.5 Soak the test unit and air tank at 54 C 1 C (65 F 2 F) per 21.1.1 for 16 h minimum as follows:NOTE: Combination ActuatorParking chamber applied (extend power spring) to allow pushrod to stroke p
44、er 22.1.2.2. NOTE: Service brake actuator (service chamber) zero pushrod stroke. 22.1.2.6 After the soak period, pneumatically cage the combination actuator parking chamber power spring. (Room temperature air permissible, do not use air from air tank per 22.1.2.3)22.1.2.7 Open shut-off valve between
45、 air tank and air port and pressurize the service chamber to 620 kPa 35 kPa (90 lbf/in2 5 lbf/in2) (gage).22.1.2.8 Pneumatically cycle the service chamber, from zero to the pushrod stroke limit (75% 5% rated stroke) and back to zero stroke three times. It is permissible to use room temperature make-
46、up air to the air tank to maintain 620 kPa 35 kPa (90 lbf/in2 5 lbf/in2) (gage).22.1.2.9 On the third release stroke, measure and record the time required for the pushrod to retract to within 0 to 6.4 mm (0.25 in) of its original position after the air pressure is released to 0 kPa (0 lbf/in2) (gage
47、).Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE J1469 Revised FEB2009 Page 24 of 2423. NOTES 23.1 Marginal Indicia A change bar (I) located in the left margin is for the convenience of the user
48、 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 TRUCK AND BUS BRAKE ACTUATOR SUBCOMMITTEEOF THE SAE TR
