Wear Test Procedure on Inertia Dynamometer for Brake Friction Materials PDF Download
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Author: Brake Dynamometer Standards Committee Publisher: ISBN: Category : Languages : en Pages : 0
Book Description
This SAE Recommended Practice (RP) specifies a dynamometer test procedure to characterize wear rates of automotive service brake linings (brake shoes) and disc brake pads. This revision of the wear test procedure includes several changes to: (a) harmonize with other SAE Recommeded Practices (RPs), (b) modernize and expand the test sequences, and (c) address typographical and editorial corrections from previous versions. Some specific updates include the following: Harmonization with SAE J2789 for inertia calculation and with SAE J2986 for wear measurements. Expansion of the wear versus temperature (Method A) includes temperatures below 100 °C for friction materials with ferrous metals and decelerations below 0.3 g. These updates reflect normal customer usage and field measurements using the worldwide harmonized light vehicle test procedure (WLTP) adapted for a brake duty cycle. Extension of the block wear test (Method B) with separate temperatures for front and rear brakes and lower energy levels. Common burnish schedule for all test methods to ensure consistent conditioning in preparation for the actual wear test. The new burnish method harmonizes with the FMVSS 135 burnish, common in other inertia dynamometer tests.
Author: Brake Dynamometer Standards Committee Publisher: ISBN: Category : Languages : en Pages : 0
Book Description
This SAE Recommended Practice (RP) specifies a dynamometer test procedure to characterize wear rates of automotive service brake linings (brake shoes) and disc brake pads. This revision of the wear test procedure includes several changes to: (a) harmonize with other SAE Recommeded Practices (RPs), (b) modernize and expand the test sequences, and (c) address typographical and editorial corrections from previous versions. Some specific updates include the following: Harmonization with SAE J2789 for inertia calculation and with SAE J2986 for wear measurements. Expansion of the wear versus temperature (Method A) includes temperatures below 100 °C for friction materials with ferrous metals and decelerations below 0.3 g. These updates reflect normal customer usage and field measurements using the worldwide harmonized light vehicle test procedure (WLTP) adapted for a brake duty cycle. Extension of the block wear test (Method B) with separate temperatures for front and rear brakes and lower energy levels. Common burnish schedule for all test methods to ensure consistent conditioning in preparation for the actual wear test. The new burnish method harmonizes with the FMVSS 135 burnish, common in other inertia dynamometer tests.
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 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: https://www.chinesestandard.net Publisher: https://www.chinesestandard.net ISBN: Category : Technology & Engineering Languages : en Pages : 38
Book Description
This document specifies the test conditions and preparation, specimen items and procedures, and test reports of the scale inertia dynamometer test method for the brake lining friction materials of road vehicles. This document is applicable to the scale inertia dynamometer test of disc brake linings of passenger cars. On the basis of familiarity with the principle of scale reduction, this document may also be taken as a reference for the brake lining test of other types of vehicles. This document is applicable to raw material screening and inspection, early development of friction materials, quality control of production processes and test of foreign samples.
Author: Brake Dynamometer Standards Committee Publisher: ISBN: Category : Languages : en Pages : 0
Book Description
This SAE Recommended Practice establishes an inertia dynamometer test procedure, using an exemplar caliper disc brake, to characterize the effectiveness of disc brake friction materials for passenger cars and light-duty trucks, up to and including 2700 kg (5954 lb) GVW. SAE J1652 provides a method of characterizing friction material effectiveness on a full disc brake, using test conditions that approximate those for U.S. mandated new vehicle brake tests.
Author: Brake Dynamometer Standards Committee Publisher: ISBN: Category : Languages : en Pages : 0
Book Description
This Recommended Practice is derived from the Federal Motor Vehicle Safety Standard 135 vehicle test protocol as a single-ended inertia-dynamometer test procedure. It measures brake output, friction material effectiveness, and corner performance in a controlled and repeatable environment. The test procedure also includes optional sections for parking brake output performance for rear brakes. It is applicable to brake corners from vehicles covered by the FMVSS 135 when using the appropriate brake hardware and test parameters. This procedure is applicable to all passenger cars and light trucks up to 3500 kg of GVWR.This Recommended Practice is the result of an industry effort to develop an inertia-dynamometer test procedure based upon the FMVSS 135 vehicle test. Results from this test provide a laboratory assessment of the brake corner performance. Data from this Recommended Practice may be combined with other brake system and vehicle characteristics to predict vehicle performance. The conditions defined in this Recommended Practice are drawn from FMVSS 135 vehicle test experience. The deceleration levels are not necessarily based on those needed to meet the requirements of the FMVSS 135. This procedure is intended to properly represent the lining conditioning which occurs during an FMVSS 135 vehicle test.
Author: Truck and Bus Hydraulic Brake Committee Publisher: ISBN: Category : Languages : en Pages : 0
Book Description
This Recommended Practice is derived from the FMVSS 105 vehicle test and applies to two-axle multipurpose passenger vehicles, trucks and buses with a GVWR above 4 540 kg (10 000 lbs) equipped with hydraulic service brakes. There are two main test sequences: Development Test Sequence for generic test conditions when not all information is available or when an assessment of brake output at different inputs are required, and FMVSS Test Sequence when vehicle parameters for brake pressure as a function of brake pedal input force and vehicle-specific loading and brake distribution are available. The test sequences are derived from the Federal Motor Vehicle Safety Standard 105 (and 121 for optional sections) as single-ended inertia-dynamometer test procedures when using the appropriate brake hardware and test parameters. This recommended practice provides Original Equipment Manufacturers (OEMs), brake and component manufacturers, as well as aftermarket suppliers, results related to brake output, friction material effectiveness, and corner performance in a laboratory-controlled test environment.The test sequences include different dynamic conditions (braking speeds, temperature, and braking history as outlined in the FMVSS 105); inertia loads equivalent to the vehicle's LLVW and GVWR; fully operational, partial failure, and failed system conditions. All applicable sections of the FMVSS 105 are included. Optional sections include: parking brake output, water recovery, TP-121D dynamometer retardation, and 32 km/h (20 mph) stops to simulate Federal Motor Carrier Safety (FMCS) requirements.This Recommended Practice does not evaluate or quantify other brake system characteristics such as wear, 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 stopping distance or equivalent deceleration levels of the FMVSS 105 vehicle test can be assessed as part of the project in coordination with the test requestor when using the appropriate vehicle information and vehicle dynamics modeling. Nevertheless, this procedure and its results do not replace the vehicle-level test to demonstrate compliance to FMVSS (105 for hydraulic brake systems or 121 for air-over-hydraulic brake systems), or other mandatory regulations (like ECE R13 or equivalents). Vehicle and braking systems development is fast-paced, and involves a global supplier base. This Recommended Practice provides an inertia-dynamometer test procedure that is repeatable and cost-effective. It evaluates the performance of the brake corner and its components (including friction material) by following the test procedure and sequence as indicated in the Federal Motor Vehicle Safety Standard (FMVSS) 105. Data from this Recommended Practice may be combined with other brake system and vehicle characteristics to predict vehicle performance.Since the first release of the FMVSS 105, there have been numerous inertia-dynamometer test protocols developed and used by the industry with different approaches and levels of detail. The SAE Truck and Bus Hydraulic Brake Committee considers laboratory test procedures useful in supporting harmonization to improve the overall performance and safety of motor vehicle braking systems.
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 defines an Inertia Dynamometer Test procedure that assesses the effectiveness behavior of a friction material with regard to pressure, temperature and speed for motor vehicles fitted with hydraulic brake actuation.The main purpose of SAE J2522 is to compare friction materials under the most equal conditions possible. To account for the cooling behavior of different test stands, the fade sections are temperature-controlled.
Author: Brake Dynamometer Standards Committee
Author: Brake Dynamometer Standards Committee
Author: Truck and Bus Hydraulic Brake Committee
Author: Truck and Bus Foundation Brake Committee
Author: https://www.chinesestandard.net
Author: Brake Dynamometer Standards Committee
Author: Brake Dynamometer Standards Committee
Author: Truck and Bus Hydraulic Brake Committee
Author: R. G. Bayer
Author: Truck and Bus Hydraulic Brake Committee
Author: Brake Dynamometer Standards Committee