BRAKE RATING TEST CODE COMMERCIAL VEHICLE INERTIA DYNAMOMETER PDF Download
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Author: Truck and Bus Foundation Brake Committee Publisher: ISBN: Category : Languages : en Pages : 0
Book Description
The code provides test procedures and methods of calculating a brake rating from the data obtained. At this time, the procedure has been developed to cover only brakes of the sizes and types generally used on commercial vehicles. Some general correlation may be expected between brake ratings established by this means and those obtained from vehicle tests such as outlined in SAE J880. However, the effects of brake environment as installed in various vehicles are not considered in this laboratory procedure.The code may be used as a supplement to SAE J667, or it may be used independently.Other methods of measuring energy absorption capacity and establishing a brake rating other than those described herein may be equally valid.The user of this SAE Recommended Practice should also take note that the brake rating horsepower (brhp) calculated by conduct of this code is an arbitrary index of performance of the brake (and drum) when tested by this procedure and may be appreciably different from the values obtained by other techniques.
Author: Truck and Bus Foundation Brake Committee Publisher: ISBN: Category : Languages : en Pages : 0
Book Description
The code provides test procedures and methods of calculating a brake rating from the data obtained. At this time, the procedure has been developed to cover only brakes of the sizes and types generally used on commercial vehicles. Some general correlation may be expected between brake ratings established by this means and those obtained from vehicle tests such as outlined in SAE J880. However, the effects of brake environment as installed in various vehicles are not considered in this laboratory procedure.The code may be used as a supplement to SAE J667, or it may be used independently.Other methods of measuring energy absorption capacity and establishing a brake rating other than those described herein may be equally valid.The user of this SAE Recommended Practice should also take note that the brake rating horsepower (brhp) calculated by conduct of this code is an arbitrary index of performance of the brake (and drum) when tested by this procedure and may be appreciably different from the values obtained by other techniques.
Author: Truck and Bus Foundation Brake Committee Publisher: ISBN: Category : Languages : en Pages : 0
Book Description
The code provides test procedures and methods of calculating a brake rating from the data obtained for brakes used in highway commercial vehicles over 4.5 T (10 000 lbs) GVWR air and hydraulic. Some general correlation may be expected between brake ratings established by this means and those obtained from vehicle tests such as outlined in SAE J880. The brake rating power, kW (hp) calculated by conduct of this code is an arbitrary index of performance of the brake and drum when tested by this procedure and may be appreciably different from the values obtained by other techniques.
Author: Truck and Bus Foundation Brake Committee Publisher: ISBN: Category : Languages : en Pages : 0
Book Description
This SAE Standard provides test procedures for air and air-over-hydraulic disc or drum brakes used for on-highway commercial vehicles over 4536 kg (10000 pounds) GVWR. This recommended practice includes the pass/fail criteria of Federal Motor Vehicle Safety Standard No. TP-121D-01. This revision was prompted by the Five-Year Review interval and contains editorial changes intended to make the document cleaner and more user friendly.
Author: Truck and Bus Foundation Brake Committee Publisher: ISBN: Category : Languages : en Pages : 0
Book Description
This SAE Standard provides test procedures for air, air/hydraulic, and hydraulic drum and disc brakes used on highway commercial vehicles over 4536 kg (10,000 lb) GVWR.
Author: Truck and Bus Foundation Brake Committee Publisher: ISBN: Category : Languages : en Pages : 0
Book Description
This Recommended Practice applies to commercial vehicles equipped with air disc brakes and above 4536 kg of Gross Vehicle Weight Rating. Other assessments on the friction material or rotor related to wear, durability, correlation to product life, noise, judder, compliance to specific regulations, etc., are not part of this RP (Recommended Practice). This revision of the SAE J3080 includes typographical corrections and provides the proper internal references to other sections or items in the document. The original rationale from the original release is still applicable.Brake rotor cracks on commercial vehicles can compromise the structural integrity of the foundation brake. These failures can amount to significant maintenance and downtime costs. In order to provide an early assessment of this failure mode, vehicle manufacturers as well as brake suppliers have developed multiple laboratory test procedures. These procedures determine (using different test methods and test approaches) the propensity of a given friction couple (brake rotor and friction material) to develop cracks which can render the brakes out-of-service.It is the objective of this Recommended Practice (RP) to establish a uniform and industry-endorsed laboratory method which reflects the most commonly used inertia dynamometer test procedure. This RP harmonizes the test conditions when applicable, and determines the minimum requirements for the test system used to conduct the test. The two methods included on this RP reflect the two main approaches to rotor crack testing. Method A uses a bedding cycle at 200 °C and 300 °C, and incorporates performance (torque output) versus pressure during the bedding; Method B uses a single bedding cycle at 150 °C. This RP also presents the method and criteria to assess and report rotor cracks. This RP applies when comparing test results to a baseline, a product specification, or a legacy product design.
Author: Truck and Bus Hydraulic Brake Committee Publisher: ISBN: Category : Languages : en Pages : 0
Book Description
This Recommended Practice is derived from OEM and tier-1 laboratory tests and applies to two-axle multipurpose passenger vehicles, or trucks with a GVWR above 4536 kg (10 000 pounds) equipped with hydraulic disc or drum service brakes. Before conducting testing for a specific brake sizes or under specific test conditions, review, agree upon, and document with the test requestor any deviations from the test procedure. Also, the applicable criteria for the final test results and wear rates deemed as significantly different require definition, assessment, and proper documentation; especially as this will determine whether or not Method B testing is needed.This Recommended Practice does not evaluate or quantify other brake system characteristics such as performance, noise, judder, ABS performance, or braking under extreme temperatures or speeds. Minimum performance requirements are not part of this recommended practice. Consistency and margin of pass/fail of the minimum requirements related to wear rates and wear behavior can be assessed as part of the project in coordination with the test requestor.NOTE: This Recommended Practice uses the unit conversion and rounding techniques from the NIST Special Publication 811. This to ensure the use of standard conversion factors and to determine the appropriate number of significant digits to ensure the Rounding Error (RE) of the converted unit is smaller than or similar to the RE of the original English or Imperial unit. SAE J3006 has been reaffirmed to comply with the SAE Five-Year Review policy.
Author: Brake Dynamometer Standards Committee Publisher: ISBN: Category : Languages : en Pages : 0
Book Description
This SAE Recommended Practice specifies a dynamometer test procedure to be used for the measurement of automotive service brake linings and disc brake pads wear. Special motor vehicles and motorcycles are excluded from the application. Trailers with nominal Gross Combination Weight Rating exceeding 40 tons are also excluded from this Recommended Practice.
Author: Truck and Bus Hydraulic Brake Committee Publisher: ISBN: Category : Languages : en Pages : 0
Book Description
This Recommended Practice is derived from OEM and tier-1 laboratory tests and applies to two-axle multipurpose passenger vehicles, or trucks with a GVWR above 4536 kg (10 000 pounds) equipped with hydraulic disc or drum service brakes. Before conducting testing for a specific brake sizes or under specific test conditions, review, agree upon, and document with the test requestor any deviations from the test procedure. Also, the applicable criteria for the final test results and wear rates deemed as significantly different require definition, assessment, and proper documentation; especially as this will determine whether or not Method B testing is needed.This Recommended Practice does not evaluate or quantify other brake system characteristics such as performance, noise, judder, ABS performance, or braking under extreme temperatures or speeds. Minimum performance requirements are not part of this recommended practice. Consistency and margin of pass/fail of the minimum requirements related to wear rates and wear behavior can be assessed as part of the project in coordination with the test requestor.NOTE: This Recommended Practice uses the unit conversion and rounding techniques from the NIST Special Publication 811. This to ensure the use of standard conversion factors and to determine the appropriate number of significant digits to ensure the Rounding Error (RE) of the converted unit is smaller than or similar to the RE of the original English or Imperial unit. Certain vehicle applications (like flat-bed recovery vehicles) have driving patterns which are considered light-duty with (a) friction material temperatures remaining under 232.0 °C (450 °F) 2.03 to 2.54 mm (0.08 to 0.1 inch) below the braking surface for at least 90% of the time, and (b) brake applications which require 2690 kPa (390 lbf/in2) or less of hydraulic pressure. This Recommended Practice provides two inertia-dynamometer test procedures, which are repeatable and cost-effective to assess, screen, benchmark, troubleshoot, or fingerprint a given foundation brake regarding low-duty brake wear. The first procedure (or Method A) is a wear versus temperature test from 93.0 to 427.0 °C (200 to 800 °F) to determine if there are potential wear rate issues under low temperature conditions and a low-duty driving cycle. If deemed required after the initial wear versus temperature test (Method A), or upon direct customer request, the second procedure (or Method B) provides an extensive wear test at a constant temperature of 79.0 °C (175 °F) to determine the wear rates and behavior of the friction couple. Data from this Recommended Practice may be combined with other brake system and vehicle characteristics for a comprehensive product characterization program.Since other wear test procedures cover a different (higher) range of operating temperatures, kinetic energies, and levels, the accelerated wear rate behavior of certain friction materials under low-duty regimes is not properly determined or estimated using test conditions which can affect the transfer layer behavior. The wear test method implemented in this Recommended Practice was derived from prior field testing and correlation investigation. Hence, careful attention was given to not alter the sequence and test conditions which have demonstrated correspondence to the vehicle behavior.The SAE Truck and Bus Hydraulic Brake Committee considers laboratory test procedures useful in supporting harmonization to improve the overall performance, durability, and safety of motor vehicle braking systems using relevant and cost-effective protocols.
Author: Truck and Bus Foundation Brake Committee
Author: Truck and Bus Foundation Brake Committee
Author: Truck and Bus Foundation Brake Committee
Author: Society of Automotive Engineers. Truck and Bus Brake Committee
Author: Truck and Bus Foundation Brake Committee
Author: Truck and Bus Foundation Brake Committee
Author: Society of Automotive Engineers. Brake Committee
Author: Truck and Bus Foundation Brake Committee
Author: Truck and Bus Hydraulic Brake Committee
Author: Brake Dynamometer Standards Committee
Author: Truck and Bus Hydraulic Brake Committee