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 there
2、from, 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 2008 SAE International All rights reserved. No part of this publication m
3、ay 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.org J2318 REV. JAN2008 SURFACE VEHICLE STANDARD Issued 2002-01 Revised 2008-01 Superseding J2318 JAN2002 Air Brake Actuator Test Performance RequirementsTruck and Bus RATIONALE SAE J2318 provides test performance require
5、ments for SAE J1469, “Air Brake Actuator Test Procedure, Truck-Tractor, Bus, and Trailers”. This revision reflects the revisions made in SAE J1469, namely to include the special needs of an actuator when mounted to a disc brake caliper. In addition, modifications were made to the parking force table
6、 format and service force table format for improved standardization and ease of use. The service force table also included corrections to the data values and added some sizes that are commonly used with disc brakes. Finally, a revision to provide the minimum acceptable vibration performance was adde
7、d and the requirement to meet “out of box” force requirement cycle testing parking springs 200K cycles was rescinded. TABLE OF CONTENTS 1. SCOPE 2 1.1 Purpose. 2 2. REFERENCES 2 2.1 Applicable Publications . 2 2.1.1 SAE Publications. 2 2.1.2 U. S. Government Publications. 3 3. DEFINITIONS . 3 4. LEA
8、K RATEPARKING AND SERVICE CHAMBER 3 5. CHAMBER VOLUMEPARKING AND SERVICE CHAMBER . 3 5.2 Parking Chamber 3 5.3 Service Chamber 3 6. RELEASE AND HOLD-OFF PRESSUREPARKING CHAMBER . 3 7. PRESSURE RESPONSESERVICE CHAMBER. 4 8. FORCE OUTPUT AND STROKEPARKING CHAMBER 4 9. FORCE OUTPUT AND STROKESERVICE CH
9、AMBER 4 10. LOW TEMPERATURE LEAKAGEPARKING AND SERVICE CHAMBER . 7 11. LOW TEMPERATURE MAXIMUM RELEASE AND HOLD-OFF PRESSURE 7 Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE J2318 Revised JAN200
10、8 - 2 - 12. LOW TEMPERATURE FORCE OUTPUTPARKING CHAMBER. 7 13. LOW TEMPERATURE OPERATIONAL TESTSERVICE CHAMBER 7 14. CORROSION RESISTANCE-COMBINATION, PARKING, AND SERVICE ACTUATORS. 7 15. MECHANICAL BACK-OFF RELEASE MECHANISM 8 16. PROOF PRESSURE TESTPARKING AND SERVICE CHAMBER 8 16.2 Parking Chamb
11、er 8 16.3 Service Chamber 8 17. CYCLE TESTPARKING CHAMBER. 8 18. CYCLE TESTSERVICE CHAMBER . 9 19. ELEVATED TEMPERATURE CYCLE TESTPARKING AND SERVICE CHAMBER. 9 19.2 Parking Chamber 9 19.3 Service Chamber 9 20. VIBRATION TEST. 9 20.3 Mounting Nut Torque 9 20.4 Leakage Test 9 20.5 Performance Test 10
12、 20.6 Structural. 10 21. NOTES 10 21.1 Marginal Indicia. 10 1. SCOPE This procedure provides test performance requirements for service, spring applied parking, and double diaphragm combination air brake actuators with respect to durability, function, and environmental performance when tested in acco
13、rdance to SAE J1469. 1.1 Purpose This SAE recommended procedure provides uniform minimum requirements for air brake actuators used in air brake systems for trucks, truck-tractor, bus, and trailers. 2. REFERENCES 2.1 Applicable Publications The following publications form a part of the specification
14、to the extent specified herein. Unless otherwise indicated, the latest issue of SAE publications shall apply. 2.1.1 SAE Publications Available from SAE, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or 724-776-4970 (outside USA), www.sae.org. SAE J1469
15、Air Brake Actuator Test Procedure, Truck-Tractor, Bus and Trailers Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE J2318 Revised JAN2008 - 3 - 2.1.2 U. S. Government Publications Available from t
16、he Superintendent of Documents, U.S. Government Printing Office, Mail Stop: SSOP, Washington, DC 20402-9320, www.access.gpo.gov/nara. FMVSS 121 Air Brake Systems, 49 CFR Parts 571.121 3. DEFINITIONS Refer to SAE J1469, Section 3. 4. LEAK RATEPARKING AND SERVICE CHAMBER For allowable leak rate, refer
17、 to Table 1. 4.1 Ref: SAE J1469 Test Procedure 4. TABLE 1 - LEAK RATE - PARKING AND SERVICE CHAMBERS Chamber Tested Maximum AllowableLeakage Rate (Calculated) Alternate Test ProcedureMaximum Allowable Pressure Change Applicable SAE J1469 Test Procedure Parking Chamber 23 cc/min (1.40 in3/min) 4.1.2
18、10.34 kPa (1.5 psig) 4.1.3 Service Chamber 23 cc/min (1.40 in3/min) 4.2.1 10.34 kPa (1.5 psig) 4.2.3 Caliper Flange/ Pushrod Boot Seal 0.07kPa (0.1 psig) 4.3.2 5. CHAMBER VOLUMEPARKING AND SERVICE CHAMBER 5.1 Ref: J1469 Test Procedure 5. 5.2 Parking Chamber Per FMVSS121 air reservoir sizes are calcu
19、lated from the service chamber volumes, therefore it is not required to provide recommended parking chamber volumes. 5.3 Service Chamber Service chamber volumes should be in compliance with FMVSS 121 section 5.1.2.1 for trucks and buses and section 5.2.2.1 for trailers which references Table V “Brak
20、e Chamber Rated Volumes”. 6. RELEASE AND HOLD-OFF PRESSUREPARKING CHAMBER 6.1 Ref: SAE J1469 Test Procedure 6. 6.2 Hold-off pressure (pressure decreasing) is typically measured at 5 mm (0.20 in) stroke of the parking chamber from the actuator zero stroke position. A maximum target hold-off pressure
21、of 483 kPa (70 psi) will in most applications, ensure the brakes will not drag. This requirement may vary depending on a vehicle air brake system, which may allow a higher hold-off pressure or require a lower hold-off pressure. A low hold-off pressure is preferred to ensure brakes do not drag. Copyr
22、ight SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE J2318 Revised JAN2008 - 4 - 7. PRESSURE RESPONSESERVICE CHAMBER 7.1 Ref: J1469 Test Procedure 7. 7.2 Pressure Response (pressure increasing) is typicall
23、y measured at 5 mm (0.20 in) stroke of the service chamber from the actuator zero stroke position. A minimum target Pressure Response of 13.8 kPa (2 psi) will in most applications, ensure the brakes will not drag. This requirement may vary depending on a vehicle air brake system, which may allow low
24、er pressure responses. When comparing against valve crack pressure compatibility, both the brake back pressure and service chamber presssure response must be considered. 8. FORCE OUTPUT AND STROKEPARKING CHAMBER 8.1 Ref: J1469 Test Procedure 8. 8.2 Parking force output requirements for the most comm
25、on standard and long-stroke diaphragm actuated parking chambers are given in Table 2 for reference purposes only. Forces given are nominal 10%. Parking chamber force output is measured for a complete (tandem) actuator after the power spring has been fully caged1for 24 hours. Test procedures other th
26、an SAE J1469 may require the spring be fully caged for 56 days or some other time period. The forces given in Table 2 are only applicable to test procedure SAE J1469. 8.3 There are various levels of parking forces for the same type (size) parking chambers, only the most common forces are given in Ta
27、ble 2. It is therefore incumbent upon OEM vehicle manufacturers to assure each vehicle meets grade holding or draw bar holding requirements, as well as, required stopping distances in accordance to FMVSS 121 for the specified parking chamber. TABLE 2 - PARKING CHAMBER FORCE OUTPUT STROKE(1)(Nominal
28、Forces Given 10%) 9. FORCE OUTPUT AND STROKESERVICE CHAMBER 9.1 Ref: J1469 Test Procedure 9. 9.2 Service chamber force output versus stroke at applied air pressures are given in the following tables: Table 3 Service Chamber Force Output Table 4 Rotochamber Force Output Service at Stroke 1Cage power
29、spring restrained at its most compressed position within the parking chamber. Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE J2318 Revised JAN2008 - 5 - Data given is for the most common type (s
30、ize) clamp band/sealed design service chambers and service side of tandem (combination) spring brake actuators. The forces charted are for double diaphragm actuators, as well as for Rotochambers - service. NOTE: The intent of these tables is to provide industry minimum service application forces for
31、 the purpose of engineering calculations. There may however, be some variations to these values due to manufacturers design differences. TABLE 3 - SERVICE CHAMBER FORCE OUTPUT STROKE(1)bar 1.38 2.76 4.14 5.52 6.59Type/Size (psi) (20) (40) (60) (80) (100)N 801 1588 2455 3269 4110(Lbf) (180) (357) (55
32、2) (735) (924)N 841 1855 2856 3866 4857(Lbf) (189) (417) (642) (869) (1092)N 865 1979 3410 4635 5820(Lbf) (195) (445) (767) (1042) (1309)N 890 2104 3963 5405 6784(Lbf) (200) (473) (891) (1215) (1525)N 1106 2572 4328 5889 7433(Lbf) (249) (578) (973) (1324) (1671)N 1323 3040 4693 6374 8082(Lbf) (298)
33、(684) (1055) (1433) (1817)N 1507 3371 5185 7060 8865(Lbf) (339) (758) (1166) (1587) (1993)N 1690 3701 5677 7746 9648(Lbf) (380) (832) (1276) (1741) (2169)N 2235 4751 7340 9888 12411(Lbf) (503) (1068) (1650) (2223) (2790)N 2709 5814 8830 11863 14808(Lbf) (609) (1307) (1985) (2667) (3329)33% to 90% ra
34、ted stroke Max Tol +10% 5% 5% 5% 5%33% to 67% rated stroke Min Tol -15% -5% -5% -5% -5% 90% rated Stroke Min Tol -30% -20% -15% -15% -15%1. Table 3 - For Reference Purposes only36221820162. Minimum allowable force is a linear progression from the Minimum value at 67% of rated stroke to the Minimum v
35、alue at 90% of rated stroke243091214Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE J2318 Revised JAN2008 - 6 - TABLE 4 - ROTOCHAMBER FORCE OUTPUT - SERVICE STROKE Copyright SAE International Pro
36、vided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE J2318 Revised JAN2008 - 7 - 10. LOW TEMPERATURE LEAKAGEPARKING AND SERVICE CHAMBER For allowable leakage, refer to Table 5. 10.1 Ref: J1469 Test Procedure 10. TABLE 5 - LOW TEMPE
37、RATURE LEAKAGE - PARKING AND SERVICE CHAMBER Chamber Tested Maximum AllowableLeakage Rate (Calculated) Alternate Test ProcedureMaximum Allowable Pressure Change Applicable SAE J1469 Test Procedure Parking Chamber 30 cc/min (1.83 in3/min) 9.1.2 13.79 kPa (2.0 psig) 9.1.3 Service Chamber 30 cc/min (1.
38、83 in3/min) 9.2.2 13.79 kPa (2.0 psig) 9.2.3 Caliper Flange Pushrod Boot Seal 0.07 KPa (0.1 psig) 11. LOW TEMPERATURE MAXIMUM RELEASE AND HOLD-OFF PRESSURE 11.1 Ref: SAE J1469 test procedure 11. 11.2 Same as Section 6. 12. LOW TEMPERATURE FORCE OUTPUTPARKING CHAMBER 12.1 Ref: SAE J1469 Test Procedur
39、e 12. 12.2 Same as Section 8. 13. LOW TEMPERATURE OPERATIONAL TESTSERVICE CHAMBER 13.1 Ref: SAE J1469 Test Procedure 13.1. 13.2 The service chamber diaphragm shall return to within 6.4 mm (0.25 in) of zero stroke within 60 s without assistance. 13.3 Upon disassembly there shall be no visual damage o
40、r cracking to the diaphragm. 13.4 Ref SAE J1469 Test Procedure 13.2. 13.5 Same as Section 7. 14. CORROSION RESISTANCE-COMBINATION, PARKING, AND SERVICE ACTUATORS 14.1 Ref: SAE J1469 Test Procedure 14. 14.2 After units have been air dried, they shall meet the following minimum requirements: 14.2.1 Ou
41、tput Force for Parking Chamber of a Combination Actuator Same as Section 8. Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE J2318 Revised JAN2008 - 8 - 14.2.2 Release Pressure for a Parking Chamb
42、er of a Combination Actuator Same as Section 6. 14.2.3 LeakageParking Chamber Same as Section 10. 14.2.4 LeakageService Chamber Same as Section 10. 14.2.5 Mechanical Back-Off Release Mechanism for Spring Brake Actuators with Integral Release Mechanisms Same as 15.2. 15. MECHANICAL BACK-OFF RELEASE M
43、ECHANISM 15.1 Ref: SAE J1469 Test Procedure 15. 15.2 The running torque shall not be greater than 67.8 Nm (50 lb-ft) to manually cage (compress) the power spring for all 5 applications. 15.3 No evidence of galling of the threads on any internal or external threaded parts is permitted. 16. PROOF PRES
44、SURE TESTPARKING AND SERVICE CHAMBER 16.1 Ref: SAE J1469 Test Procedure 16. 16.2 Parking Chamber 16.2.1 Leakage Same as Section 10. 16.2.2 Unit shall have no structural failure. 16.3 Service Chamber 16.3.1 Leakage Same as Section 10. 16.3.2 Unit shall have no structural failure. 17. CYCLE TESTPARKIN
45、G CHAMBER 17.1 Ref: SAE J1469 Test Procedure 17. 17.2 Test unit must complete a minimum of 200 000 cycles. 17.2.1 Leakage Same as Section 10. Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE J2318
46、 Revised JAN2008 - 9 - 17.2.2 Force Output For reference and reporting only. 17.2.3 Maximum Release and Hold-Off Pressure Same as Section 6. 17.2.4 There shall be no component failure. 18. CYCLE TESTSERVICE CHAMBER 18.1 Ref: SAE J1469 Test Procedure 18. 18.2 Test unit must complete a minimum of 1 00
47、0 000 cycles. 18.2.1 Leakage Same as Section 10. 18.2.2 There shall be no component failures. 19. ELEVATED TEMPERATURE CYCLE TESTPARKING AND SERVICE CHAMBER 19.1 Ref: SAE J1469 Test Procedure 19. 19.2 Parking Chamber 19.2.1 Leakage Same as Section 10. 19.3 Service Chamber 19.3.1 Leakage Same as Sect
48、ion 10. 19.4 There shall be no component failures. 20. VIBRATION TEST 20.1 Ref: SAE J1469 Test Procedure 20. 20.2 Unless otherwise specified by the equipment manufacturer, after applying a minimum of 8.5G input acceleration at resonant frequency, the resonant frequency should not change by more than 10% during a 1 million cycle test. 20.3 Mounting Nut Torque 20.3.1 Mounting nut torque to be measured by tightening the nut. The recorded torque shall be within the l
