SANS 1622-2009 New replacement brake drums for motor vehicles《机动车新备用制动鼓》.pdf
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1、 Collection of SANS standards in electronic format (PDF) 1. Copyright This standard is available to staff members of companies that have subscribed to the complete collection of SANS standards in accordance with a formal copyright agreement. This document may reside on a CENTRAL FILE SERVER or INTRA
2、NET SYSTEM only. Unless specific permission has been granted, this document MAY NOT be sent or given to staff members from other companies or organizations. Doing so would constitute a VIOLATION of SABS copyright rules. 2. Indemnity The South African Bureau of Standards accepts no liability for any
3、damage whatsoever than may result from the use of this material or the information contain therein, irrespective of the cause and quantum thereof. ISBN 978-0-626-22572-8 SANS 1622:2009Edition 1.1Any reference to SABS 1622 is deemedto be a reference to this standard(Government Notice No. 1373 of 8 No
4、vember 2002)SOUTH AFRICAN NATIONAL STANDARD Road vehicle safety standard New replacement brake drums for motor vehicles Published by SABS Standards Division 1 Dr Lategan Road Groenkloof Private Bag X191 Pretoria 0001Tel: +27 12 428 7911 Fax: +27 12 344 1568 www.sabs.co.za SABS SANS 1622:2009 Edition
5、 1.1 Table of changes Change No. Date Scope Amdt 1 2009 Amended to change the designation of SABS standards to SANS standards, with no technical changes. Foreword This South African standard was approved by National Committee SABS SC 22F, Steering committee for construction of motor vehicles Braking
6、, in accordance with procedures of the SABS Standards Division, in compliance with annex 3 of the WTO/TBT agreement. This document was published in March 2009. This document supersedes SABS 1622:1995 (edition 1). Annexes A and B form an integral part of this document. SANS 1622:2009 Edition 1.1 1 Co
7、ntents Page Foreword 1 Scope 3 2 Normative references 3 3 Definitions 3 4 General requirements 5 Annex A (normative) Light vehicle brake drum performance tests 8 Annex B (normative) Heavy vehicle brake drum performance tests 10 SANS 1622:2009 Edition 1.1 2 This page is intentionally left blank SANS
8、1622:2009 Edition 1.1 3 New replacement brake drums for motor vehicles 1 Scope This standard specifies the composition and the performance requirements of new replacement cast-iron brake drums for motor vehicles. 2 Normative references The following standard contains provisions which, through refere
9、nce in this text, constitute provisions of this standard. All standards are subject to revision and, since any reference to a standard is deemed to be a reference to the latest edition of that standard, parties to agreements based on this standard are encouraged to take steps to ensure the use of th
10、e most recent edition of the standard indicated below. Information on currently valid national and international standards may be obtained from the SABS Standards Division. SANS 1034, Grey iron castings. 3 Definitions For the purposes of this standard, the following definitions apply: 3.1 brake lini
11、ng component that comprises the friction material and that makes contact with the brake drum when the brakes are applied 3.2 contact surface (see figure 1) inner surface of the drum, which is contacted by the brake lining 3.3 crazing pattern of small hairline cracks 3.4 dynamometer machine that simu
12、lates the inertia effect when a motor vehicle is being braked 3.5 heat (thermal) spots hard spots that are caused by changes in the structure of the drum material and that result from the temperature gradient within those spots SANS 1622:2009 Edition 1.1 4 3.6 heavy vehicle vehicle of category M2, M
13、3, N2, N3, O3or O43.6.1 M2vehicle vehicle that is used for the carriage of passengers, that comprises more than eight seats in addition to the drivers seat, and that has a maximum mass not exceeding 5 t 3.6.2 M3vehicle vehicle that is used for the carriage of passengers, that comprises more than eig
14、ht seats in addition to the drivers seat, and that has a maximum mass exceeding 5 t 3.6.3 N2vehicle vehicle that is used for the carriage of goods and that has a maximum mass exceeding 3,5 t but not exceeding 12 t 3.6.4 N3vehicle vehicle that is used for the carriage of goods and that has a maximum
15、mass exceeding 12 t 3.6.5 O3vehicle trailer that has a maximum mass exceeding 3,5 t but not exceeding 10 t 3.6.6 O4vehicle trailer that has a maximum mass exceeding 10 t 3.7 light vehicle vehicle of category M1, N1, O1or O23.7.1 M1vehicle vehicle that is used for the carriage of passengers and that
16、comprises not more than eight seats in addition to the drivers seat 3.7.2 N1vehicle vehicle that is used for the carriage of goods and that has a maximum mass not exceeding 3,5 t 3.7.3 O1vehicle single-axle trailer, other than a semi-trailer, that has a maximum mass not exceeding 0,75 t 3.7.4 O2vehi
17、cle trailer, other than a trailer of category O1, that has a maximum mass not exceeding 3,5 t 3.8 reference brake lining brake lining that is selected for the purpose of testing the performance of brake drums, being the original equipment (OE) lining for the drum, which the drum under test is intend
18、ed to replace SANS 1622:2009 Edition 1.1 5 4 General requirements 4.1 Equivalent requirements The requirements of clause 4 may be deemed to have been met if the component complies with alternative requirements that achieve the objectives of the requirements of this standard. 4.2 Metallurgical requir
19、ements 4.2.1 The material of the brake drum shall comply with the requirements for grade 250 cast iron as specified in SANS 1034. The Brinell hardness (HB 10/3000) measured on the flange of the drum shall be in the range 200 to 230. Test specimens that are representative of the applicable cross-sect
20、ional thickness of the casting shall comply with the minimum tensile strength requirements stated in SANS 1034. 4.2.2 A copy of the test certificates submitted by the foundry relevant to the sample submitted for testing shall be supplied with sample brake drums submitted for testing. 4.3 Physical re
21、quirements 4.3.1 Brake drums shall be free from visible hairline cracks, blowholes and other surface imperfections. 4.3.2 The spigot location hole (see figure 1) shall be concentric to within 0,2 mm with the diameter of the contact surface of the drum. 4.3.3 The pitch circle diameter (PCD) of the mo
22、unting stud holes shall be concentric to within 0,3 mm with the diameter of the contact surface of the drum. 4.3.4 The limits of ovality of the contact surface diameter shall not exceed 0,2 mm for a light vehicle drum and 0,3 mm for a heavy vehicle drum. 4.3.5 The inner and outer machined faces (see
23、 figure 1) shall be at 90 7 to the machined inner contact surface. 4.3.6 The contact surface shall be machined to a finish of 1,6 m to 3,2 m. 4.3.7 The portions of the inner and outer faces of the flange that are machined shall have a surface finish of 6,3 m to 12,5 m. 4.3.8 The thickness of the mat
24、erial that forms the drum cylinder wall (see figure 1) should be sufficient to allow for reconditioning cuts. The maximum oversize diameter allowed for this purpose shall be permanently marked or cast into the drum in a conspicuous position in such a manner as to preclude it from being removed when
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