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. ICS 65.060.80 ISBN 0-626-15097-3 SANS 11512:2003 Edition 1 ISO 11512:1995 Edition 1 SOUTH AFRICAN NATIONAL STANDARD Machinery for forestry Tracked specia
4、l machines Performance criteria for brake systems This national standard is the identical implementation of ISO 11512:1995, and is adopted with the permission of the International Organization for Standardization. Published by Standards South Africa 1 dr lategan road groenkloof private bag x191 pret
5、oria 0001 tel: 012 428 7911 fax: 012 344 1568 international code + 27 12 www.stansa.co.za Standards South Africa 2003 SANS 11512:2003 Edition 1 ISO 11512:1995 Edition 1 Table of changes Change No. Date Scope Abstract Specifies performance test methods and criteria to enable uniform assessment of the
6、 service, secondary and parking brake systems of tracked specially designed forestry maschines. Applies to self-propelled tracked special forestry machines with a maximum design speed of 20 km/h or less. Keywords agricultural machines, braking systems, forestry equipment, tracked vehicles. National
7、foreword This South African standard was approved by National Committee STANSA TC 5120.38, Earth-moving and forestry machinery, in accordance with procedures of Standards South Africa, in compliance with annex 3 of the WTO/TBT agreement. INTERNATIONAL STANDARD ISO 11512 First edition 1995-03-01 Mach
8、inery for forestry - Tracked special machines - Performance criteria for brake Systems Ma Wie/ forestier - Machines specifiques SW chenilles - Criteres de Performance des dispositifs de freinage Reference number ISO 11512: 1995jE) ISO 11512:1995(E) Foreword ISO (the International Organization for St
9、andardization) is a worldwide federation of national Standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Esch member body interested in a subject for which a technical committee has been established has the rig
10、ht to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (1 EC) on all matters of electrotechnical standardization. Draft Intern
11、ational Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard ISO 11512 was prepared by Technical Committee ISOnC 23, Tratto
12、rs and machinety for agriculture and forestry, Subcom- mittee SC 15, Machinery for forestry. 0 ISO 1995 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronie or mechanical, including photocopyrng and microfi
13、lm, without Permission in writing from the publisher. International Organization for Standardization Case Postale 56 l CH-1 211 Geneve 20 l Switzerland Printed in Switzerland ii INTERNATIONAL STANDARD 0 ISO ISO 11512:1995(E) Machinery for forestry - Tracked special machines - Performance criteria fo
14、r brake Systems 1 Scope This International Standard specifies Performance test methods and criteria to enable uniform assessment of the Service, secondary and parking brake Systems of tracked specially designed forestry machines. This International Standard applies to self-propelled tracked special
15、forestry machines defined in ISO 6814 with a maximum design Speed, determined in ac- cordante with ISO 6014, of 20 km/h or less. NOTE 1 Such Systems include the control(s), means of brake actuation, the brake(s) and all Parts connecting the brake to the track. 3.1.1 Service brake System: Primar-y Sy
16、stem used for stopping and holding the machine. 3.12 secondary brake System: System used for stopping the machine in the event of any Single failure in the Service brake System. 3.1.3 parking brake System: System used to hold a stopped machine in a stationary Position. 2 Normative references 3.2 Bra
17、ke System components The following Standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publi- cation, the editions indicated were valid. All Standards are subject to revision, and Parties to agreements based on this
18、 International Standard are encouraged to investigate the possibility of applying the most re- cent editions of the Standards indicated below. Members of IEC and ISO maintain registers of cur- rently valid International Standards. ISO 6014: 1986, Earth-moving machinery - Determi- nation of ground Sp
19、eed. ISO 6814: 1983, Machinery for forestry - Mobile and self-propelled machinery - /den tifica tion vocabulary. 3 Definitions For the purposes of this International Standard, the following definitions apply. 3.1 brake System: All the components which com- bine together to stop and/or hold the machi
20、ne. 3.2.1 control: Component directly activated by the Operator to Cause a forte to be transmitted to the brake(s). 3.2.2 brake actuation System: All of the com- ponents between the control(s) and the brake(s) which connect them functionally. 3.2.3 brake: Components which directly apply a forte to o
21、ppose movement of the machine. NOTE 2 The brakes may, for example, be of friction, electrical or fluid types. 3.3 common component: Component that per- forms a function in two or more brake Systems. 3.4 brake retarding forte: Decelerating or holding forte due to brake System action plus rolling resi
22、st- ante, but excluding engine torque. NOTE 3 In practice, this is the forte measured in the tow-line between a machine with the test brake(s) applied and a pulling machine. ISO 11512:1995(E) z ISO 3.5 machine mass, m: Mass of a machine including - the heaviest combination of manufacturer- approved
23、equipment (i.e. winch, dozer, felling head, grapple, etc.) and components (i.e. cab, protective structures, etc.); - an Operator of 75 kg; - full fuel, lubricating, hydraulic and cooling Systems; 4.1.3 Brake disconnecting devices designed to allow movement of disabled machines shall be located out-
24、side the operatot9 Station unless they tan be re- applied immediately. 4.1.4 A power Source disconnect designed for cold- weather starting which also disables a brake System shall require application of the parking brake Prior to disconnection. - the manufacturers rated payload, in the case of forwa
25、rders. 4.2 Brake controls 3.6 slope capability, a: Maximum slope, between 25” and 45”, which the machine in transport mode as specified in 5.2 tan astend unaided with a ground friction coefficient, ,u, of 1, without exceeding its static tipping angle. NOTE 4 The slope capability may be determined on
26、 a prepared slope, or by tractive pulling forte as specified in 5.1, where CY is calculated as follows: F O! = arcsin - mg where F is the pulling forte, in newtons; m is the machine mass (3.5), in kilograms; s is the gravitational constant (R = 9,81 m/s*). 4 General requirements The following requir
27、ements for brake Systems apply to all crawler machines specified in clause 1. 4.1 Required brake Systems 4.1.1 All machines shall be equipped with a) a Service brake System; b) a secondary brake System; and c) a parking brake System. 4.1.2 No brake System shall contain a disconnecting device such as
28、 a clutch or shiftable gearbox which al- lows disabling of the brake(s). This requirement does not apply to devices specified in 4.1.3 and 4.1.4. 4.2.1 General All brake System controls shall be capable of being applied by a person sitting in the operator-+ seat. 4.2.2 Release and reapplication The
29、secondary and parking brake System(s) controI(s) shall be arranged so that they cannot be released from the operators seat once they have been applied unless they tan be reapplied immediately from the operators seat. 4.2.3 Automatic application Secondary and parking brake Systems may be applied auto
30、matically. 4.2.4 Control forces The forte applied to the brake control shall not exceed the levels given in table 1 when the required brake System Performance in table3 is measured. Table 1 - Maximum test forte levels Forte Type of control max. N Finger grasp (flip levers, switches) Hand grasp: - up
31、wards - fore-aft, sidearm pull, downward Foot treadle (ankle control) Foot Pedal 20 400 300 350 (leg control: power-assisted or not) 600 2 0 ISO ISO 11512:1995(E) 4.3 Common components Table 2 - Instrument accuracy levels Brake Systems may use common components; how- ever, failure of any Single comp
32、onent shall not reduce the effectiveness of the machines stopping capability to less than the secondary brake System Performance as defined in 6.1.2. 5 Test conditions 5.1 Test course The test course shall be relatively flat and smooth with a slope no greater than 1 % in the direction of travel, or
33、3 % transversely. The course shall be of sufficient size, materials and conditions to provide the traction required for the towing and pulling tests in clause 6. The moisture content of the soil shall be such that the mass of the test machine tan be sup- ported with only nominal sinkage. 5.2 Test pr
34、eparations The machine mass shall be as specified in 3.5. All Parameters relating to braking Systems (brake ad- justment, brake pressures, etc.) shall be within the machine manufacturers specifications. No manual adjustment(s) shall be made to the brake System(s) during any Single test. Connections
35、for towing or pulling shall be made as low as possible on the drawbar or other appropriate connecting Point(s). Blades, dozers, grapples, felling heads and other equipment shall be carried in the transport or travel Position recommended by the manufacturer. Burnishing (conditioning) of brakes before
36、 testing is permissible. The burnishing procedure shall be indi- cated in the Operators manual for the machine and shall be verified by consultation with the machine manufacturer. Immediately Prior to a test, the machine shall be op- erated until the machine fluids, i.e. engine and trans- mission oi
37、ls, are at normal operating temperature as specified by the manufacturer. 5.3 Instrumentation Instrumentation to measure and record the par- ameters within the accuracy specified in table2 shall be provided. Parameter measured Accuracy 0 / 0 Brake System pressure k2 Machine mass L-2 Brake control ac
38、tuating forte fl Slope L-1 Brake retarding forte kl 5.4 Brake retarding forte A means (normally another machine) to generate the towing or pulling forte required by the performante tests in 6.1 .l, 6.1.2 and 6.2.1 shall be provided. 6 Test and Performance criteria for brake Systems 6.1 Towing test f
39、or Service and secondary brakes The Service and secondary brake performante shall be tested by towing the machine with the trans- mission control in neutral at a Speed of 10 % to 40 % of the maximum level surface Speed deter- mined in accordance with ISO 6014. Apply the brake(s) and measure the brak
40、e retarding and brake control forces. Machines designed with hydrostatic brakes or auto- matic brakes which apply when the transmission control is in neutral may be tested by driving at the same Speed as the towing machine and then applying the brake System(s) being tested by placing the ap- propria
41、te control in the braking Position or neutral. 6.1 .l Service brake Performance criteria Application of the Service brake System with the forte specified in table 1 shall Cause the moving test ma- chine to develop a brake retarding forte as specified in table3 in both the forward and reverse directi
42、ons. Table 3 - Performance criteria for brake Systems I Brake System Brake retarding forte N Service Secondary Parking 9,8m sin cc 4,9m sin oc 9,8m sin a m is the machine mass in kilograms (see 3.5) oc is the slope capability in degrees (see 3.6) 3 ISO 11512:1995(E) 0 ISO 6.1.2 Secondary brake Perfo
43、rmance criteria Since tracked machines have two independent brakes of nominally equal capacity, application of the sec- ondary brake System with the forte specified in table 1 shall Cause at least one track on the moving test machine to develop a brake retarding forte equal to the value specified in
44、 table3, in both the forward and reverse directions. 6.2 Static pull test for parking brake The parking brake Performance shall be tested by pulling on the stationary test machine with the parking brake applied and the transmission control in neutral. Measure the static brake retarding and brake con
45、trol forces. 6.2.1 Parking brake Performance criteria Application of the parking brake System with the forte specified in table 1 shall hold the test machines tracks stopped and develop a static pulling forte as specified in table3 in both the forward and reverse directions. 6.2.2 Criteria for brakes remaining applied After application, the parking brake System shall maintain the parking brake performante specified in table3 regardless of any contraction of the brake Parts or leakage of any kind. This System shall not be de- pendent upon an exhaustible energy Source.
