SAE J2430-1999 Dynamometer Effectiveness Characterization Test for Passenger Car and Light Truck Brake Friction Products.pdf
《SAE J2430-1999 Dynamometer Effectiveness Characterization Test for Passenger Car and Light Truck Brake Friction Products.pdf》由会员分享,可在线阅读,更多相关《SAE J2430-1999 Dynamometer Effectiveness Characterization Test for Passenger Car and Light Truck Brake Friction Products.pdf(22页珍藏版)》请在三一文库上搜索。
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 1999 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 J2430 ISSUED AUG1999 Issued1999-08 Dynamometer Effectiveness Characterization Test for Passenger Car and Light Truck Brake Friction Products 1.Scope 1.1This SAE Recommended Practice establishes an inertia dynamometer test procedure, using exemplar caliper disc or drum brakes, to characterize t
5、he effectiveness of brake friction products for passenger cars and light trucks, up to and including 3500 kg GVW. SAE J2430 provides a method of characterizing friction material effectiveness, using vehicle specific brake hardware and test conditions that approximate those for U.S. mandated new vehi
6、cle brake tests. 1.2RationaleSAE J2430 is an improvement over SAE J661/J866 as a friction material effectiveness characterization test of replacement brake linings. SAE J661 uses a one-inch square sample running against a large drum and is known to have shortcomings for characterizing the vehicle pe
7、rformance of different types of automotive brake linings. 1.2.1SAE J2430 simulates certain sections of FMVSS 135. SAE J2430 is based on the controlled testing of unused friction materials against a new drum or rotor, using a prescribed set of test conditions that approximate those on a vehicle using
8、 the exemplar brakes. The FMVSS 135 vehicle test procedure emphasizes rapid braking from different speeds and includes a brake fade section. 1.2.2Interactive conditioning between brakes occurs during vehicle braking. These interactions can affect work history for both front and rear brakes with a hi
9、gher relative magnitude for rears. Variations in work history are known to cause variations in effectiveness. Also, it is recognized that brake effectiveness values can be influenced by brake and vehicle design, as well as by friction material characteristics. For the previous reasons, material effe
10、ctiveness comparisons using SAE J2430, should be based on testing with the same vehicle relevant brake and test conditions. 1.2.3SAE J2430 is not intended to characterize all aspects of friction material effectiveness, such as light duty performance, environmental sensitivity, or effectiveness drift
11、 after extended service. Also, SAE J2430 is not intended to provide a reliable characterization of lining wear, noise, or drum/rotor compatibility in typical customer service vehicle usage. 1.2.4SAE J2430 uses new, original equipment drums or rotors of prescribed chemistry, microstructure, and dimen
12、sions. Friction materials which require or use a unique mating surface may not be properly characterized by this test procedure. SAE J2430 Issued AUG1999 -2- 1.3Test FeaturesBrake effectiveness is reported as REGRESSED SPECIFIC TORQUE for ramp applications and as AVERAGE SPECIFIC TORQUE for torque a
13、nd pressure controlled applications. 1.4Test ApplicationBrake effectiveness values calculated from SAE J2430 may be used to aid in the selection of replacement friction materials for automotive disc and drum brakes that are similar in design and usage to that of the exemplar brake. 2.References 2.1A
14、pplicable PublicationsThe following publications form a part of this specification to the extent specified herein. Unless otherwise indicated, the latest version of SAE publications shall apply. 2.1.1SAE PUBLICATIONSAvailable from SAE, 400 Commonwealth Drive, Warrendale, PA 15096-0001. SAE J661Brake
15、 Lining Quality Control Test Procedure SAE J866Friction Coefficient Identification System for Brake Lining SAE J2115Brake Performance and Wear Test Code Commercial Vehicle Inertia Dynamometer 2.1.2FMVSS PUBLICATIONSAvailable from the Superintendent of Documents, U.S. Government Printing Office, Wash
16、ington, DC 20402. FMVSS 116 FMVSS 135 2.2Related PublicationThe following publication is provided for information purposes only and is not a required part of this document. 2.2.1SAE PUBLICATIONAvailable from SAE, 400 Commonwealth Drive, Warrendale, PA 15096-0001. SAE J1652Dynamometer Effectiveness C
17、haracterization Test for Passenger Car and Light Truck Caliper Disc Brake Friction Materials 3.Test Preparation 3.1Dynamometer ConfigurationSAE J2430 is to be run on an inertia dynamometer with the following minimum capabilities: 3.1.1Variable speed drive system with speed resolution to 1 rpm and ca
18、librated to 0.5% accuracy at 160 km/h. The drive should have the capability to accelerate the required inertia from 0 to 1500 rpm in 20 s. 3.1.2Incremental inertia discs to simulate specified brake inertia within 2 kg*m2. 3.1.2.1Specified brake inertia values are determined from in-stop torque/dista
19、nce calculations as outlined in Appendix A. 3.1.3Test brake station, fully enclosed in an air duct of sufficient size to accept the brake hardware and meet brake cooling specifications. 3.1.3.1For caliper disc brakes, the brake test fixture is constructed from a vehicle knuckle, caliper, and rotor t
20、hat meet original equipment specifications. An adapter attaches the knuckle to the dynamometer tailstock. SAE J2430 Issued AUG1999 -3- 3.1.3.2For drum brakes, the test brake is constructed from a brake fixture, backing plate, and drum that meet original equipment specifications. A stub axle and adap
21、ter attach the backing plate to the dynamometer tailstock. A wheel or wheel section may be included to increase brake stiffness or assist in meeting the brake cooling rate. 3.1.4A pressure transducer, accurate to within 0.5% of the reading and calibrated over the range from 300 to 14 000 kPa. 3.1.4.
22、1The pressure transducer is mounted just outside the air duct to minimize transducer thermal drift. A short (150 mm) brake line connects the transducer to the brake. (7.1)1 3.1.4.2For disc brakes, a pressure connection is made at the piston centerline on the back of the caliper, or at the caliper bl
23、eed screw to measure output pressure. 3.1.4.3For drum brakes, a pressure connection is made through a T adapter at the wheel cylinder bleed screw. 3.1.5A tailstock section and load cell connected to the test brake. Load cell is calibrated over the required range and measures brake torque with an acc
24、uracy of 0.5% at a torque corresponding to 1.0 g deceleration 3.1.6A closed loop servo system to control brake applications under specified conditions. a. Servo system capabilities include: 1.Linear pressure rise rate, over the specified range from 300 kPa through 95% of maximum pressure for the app
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- SAE J2430-1999 Dynamometer Effectiveness Characterization Test for Passenger Car and Light Truck Brake J2430
链接地址:https://www.31doc.com/p-3678402.html