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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: (412) 772-8512 FAX: (412) 776-0243 TO PLACE A DOCU
3、MENT ORDER; (412) 776-4970 FAX: (412) 776-0790 http:www.sae.org Copyright 1993 Society of Automotive Engineers, Inc. All rights reserved.Printed in U.S.A. SURFACE VEHICLE 400 Commonwealth Drive, Warrendale, PA 15096-0001 RECOMMENDED PRACTICE Submitted for recognition as an American National Standard
4、 J229 REAF. SEP93 Issued1971-03 Reaffirmed1993-09 Superseding J229 JUN80 SERVICE BRAKE STRUCTURAL INTEGRITY TEST PROCEDUREPASSENGER CAR ForewordThis reaffirmed document has been changed only to reflect the new SAE Technical Standards Board format. 1.ScopeThis SAE Recommended Practice establishes a m
5、ethod of evaluating the structural integrity of the entire brake system of all passenger cars under extreme braking conditions. 1.1PurposeThe main purpose of this document is to evaluate the structural integrity of a vehicles braking system. However, other areas, such as the steering or suspension s
6、ystem, may also be evaluated during the test, providing that the criteria and procedure detailed in the following sections are not modified in any way. For repeatability, it is recommended that a brake apply device be utilized whenever possible, since it will eliminate the variations in application
7、times and efforts of different operators. 2.References 2.1Applicable PublicationThe following publication forms 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, P
8、A 15096-0001. SAE J843Brake System Road Test CodePassenger Car and Light-Duty Truck 3.Equipment 3.1Brake apply device (optional, but recommended). 3.2Calibrated speedometer and odometer (a fifth wheel may be used as an alternative). 3.3Pedal force transducer (30 Hz minimum response if fuel for spike
9、 stops). 3.4Decelerometer. 3.5Ambient temperature gage. 3.6Recording equipment (pedal force versus time) 30 Hz minimum response. 3.7Tire pressure gage. SAE J229 Reaffirmed SEP93 -2- 3.8Wheel alignment equipment. 3.9Torque wrench. 3.10 Brake lining temperature measuring instrumentation. 4.Test Prepar
10、ation 4.1Calibrate instrumentation as required and note calibration on data sheet. 4.2Install new brake drums and/or rotors and brake assemblies to the manufacturers specifications with special attention to the torque specifications of all brake fasteners. 4.3Adjust brakes per manufacturers specific
11、ations. 4.4Check front and rear alignment, adjust to manufacturers mean specifications, and record. Rear wheel toe is not required on a vehicle with a solid axle. 4.5Vehicle test weight shall be curb weight, plus additional weights of accessories or optional equipment over 5 lb which are offered but
12、 not installed, plus a four-passenger load of 600 lb. On vehicles designed for less than four passengers, use 150 lb per passenger. All test equipment shall be part of this weight. 4.6Install the tires and wheels offered for the vehicle by the manufacturer which produce the largest moment of inertia
13、. Tires must be in good condition. Set tire pressure per manufacturers specifications for vehicle test weight specified in this document. 4.7Install plug type thermocouples in each brake (reference SAE J843). All thermocouples to be located in the approximate center of the most heavily loaded shoe,
14、one per brake. 5.General Notes 5.1All tests shall be conducted on a substantially level (not to exceed a 1% grade), dry, smooth, hard surfaced roadway of Portland cement concrete (or other surface with equivalent coefficient of surface friction) that is free from loose materials. 5.2A spike brake ap
15、plication is accomplished by applying a pedal force of 200 lb (100 lb overshoot permitted) while recording pedal force versus time. Rate of apply shall be 2500 lb/s. To achieve this rate, instantaneous rates can vary from 1000 to 4000 lb/s.1 At least 160 lb of the 200 lb force shall be within this t
16、olerance. See Figure 1 for a typical spike brake curve. Maintain pedal force until car has stopped. 1.Although tolerances of 1000 to 4000 lb/s may appear too broad, actual test curves, both manual and machine applied, show that instantaneous slopes do vary considerably. Furthermore, 40 lb of the 200
17、 lb pedal force has been exempted from this rate in order to accommodate the typical dip in the curve, as well as miscellaneous short duration spikes. Thus, it is intended that the basic slope of the curve should be 2500 lb/s for 160 lb of the 200 lb force. However, slight deviations in the curve mu
18、st be tolerated in order to achieve this rate. SAE J229 Reaffirmed SEP93 -3- FIGURE 1TYPICAL SPIKE BRAKE APPLICATION 5.3In any series of spike brake applications, the initial brake temperature for the first stop shall be 200 F. Initial brake temperature is defined as 0.2 mile before stop (average te
19、mperature of brakes on hottest axle), brakes off. If brakes require warming, use burnishing procedure (6.3.1). 5.4Spike brake applications are to be made in normal driving gear. On cars with manual transmission, disengage the clutch. 5.5Driving speed between spike brake applications is to be at the
20、subsequent test speed. Acceleration to all test speeds is to be moderate. 5.6Vehicle function stops (6.2.2, 6.4.2, etc.) may be made as soon as convenient after spike brake applications and need not be made at any specific initial brake temperature. 5.7During all phases of this procedure, note and r
21、ecord any unusual braking or handling characteristics of the vehicle. 6.Procedure 6.1Preburnish CheckIn order to allow for a general check of instrumentation, brakes, and vehicle function, the following stops are to be run, noting pedal force for each stop: a.Number of Stops10 b.Speed30 to 0 mph c.D
22、eceleration10 fpsps d.Interval1 mile e.Cooling Speed40 mph, normal driving gear SAE J229 Reaffirmed SEP93 -4- 6.2Preburnish Spike Brake Application 6.2.1Make one spike brake application from 20 mph and immediately drive 0.5 mile and make one spike brake application from 40 mph. 6.2.2Check brakes and
23、 vehicle function by making a stop from 30 mph at 10 fpsps. Note pedal force. 6.3Burnish 6.3.1Make 200 burnishing stops from 40 mph at 12 fpsps in normal driving gear. Stop interval shall be as required to achieve 250 F “initial brake temperature“ or a maximum of 1.0 mile. NOTEThe 1.0 mile maximum m
24、ust be observed even though the initial temperature exceeds 250 F. Cooling speed shall be 40 mph with moderate acceleration to cooling speed. 6.3.2Adjust brakes after burnishing per manufacturers specifications. 6.4Post Burnish Spike Brake Applications 6.4.1Make one spike brake application at each o
25、f the following speeds at 1.0 mile intervals: 10, 20, and 40 mph. 6.4.2Check brakes and vehicle function by making a stop from 30 mph at 10 fpsps. Note pedal force. 6.4.3Make two consecutive spike brake applications in reverse from 10 mph (estimated). 6.4.4Check brakes and vehicle function by making
26、 a stop from 30 mph at 10 fpsps. Note pedal force. 6.4.5Make two spike brake applications from 10 mph at 0.25 mile intervals. 6.4.6Check brakes and vehicle function by making a stop from 30 mph at 10 fpsps. Note pedal force. 6.4.7Make three spike brake applications from 40 mph at 1.0 mile intervals.
27、 6.4.8Check brakes and vehicle function by making a stop from 30 mph at 10 fpsps. Note pedal force. 6.5Inspection 6.5.1Check and record front end alignment and rear wheel toe. (Rear wheel toe is not required on vehicles with solid rear axle.) 6.5.2Inspect all components of the brake system. PREPARED
28、 BY THE SAE BRAKE STANDARDS COMMITTEE 7ROAD TEST PROCEDURES SAE J229 Reaffirmed SEP93 RationaleNot applicable. Relationship of SAE Standard to ISO StandardNot applicable. ApplicationThis SAE Recommended Practice establishes a method of evaluating the structural integrity of the entire brake system of all passenger cars under extreme braking conditions. Reference Section SAE J843Brake System Road Test CodePassenger Car and Light-Duty Truck Developed by the SAE Brake Standards Committee 7Road Test Procedures