《BS-ISO-11512-1995.pdf》由会员分享，可在线阅读，更多相关《BS-ISO-11512-1995.pdf（12页珍藏版）》请在三一文库上搜索。
1、BRITISH STANDARD BS ISO 11512:1995 Implementation of ISO 11512:1995 Machinery for forestry Tracked special machines Performance criteria for brake systems ICS 65.060.80 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 03:24:07 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 11512:1995 This B
2、ritish Standard, having been prepared under the direction of the Engineering Sector Board, was published under the authority of the Standards Board and comes into effect on 15 July 1996 BSI 02-2000 The following BSI references relate to the work on this standard: Committee reference AGE/29 Draft for
3、 comment 93/705954 DC ISBN 0 580 25969 2 Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee AGE/29, Forestry machinery, upon which the following bodies were represented: Agricultural Engineers Association Arboricultural Asso
4、ciation Consumers Association Department of Trade and Industry (Consumer safety unit, CA Division) Forestry Commission Health and Safety Executive Hire Association Europe Institution of Agricultural Engineers Incorporated National Farmers Union Co-opted members Amendments issued since publication Am
5、d. No.DateComments Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 03:24:07 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 11512:1995 BSI 02-2000i Contents Page Committees responsibleInside front cover National forewordii Forewordiii Text of ISO 115121 Licensed Copy: sheffieldun sheffieldu
6、n, na, Mon Nov 27 03:24:07 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 11512:1995 ii BSI 02-2000 National foreword This British Standard reproduces verbatim ISO 11512:1995 and implements it as the UK national standard. This British Standard is published under the direction of the Engineering S
7、ector Board whose Technical Committee AGE/29 has the responsibility to: aid enquirers to understand the text; present to the responsible international committee any enquiries on interpretation, or proposals for change, and keep UK interests informed; monitor related international and European develo
8、pments and promulgate them in the UK. NOTEInternational and European Standards, as well as overseas standards, are available from Customer Services, BSI, 389 Chiswick High Road, London W4 4AL. A British Standard does not purport to include all the necessary provisions of a contract. Users of British
9、 Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, the ISO title page, pages ii to iv, pages 1 to 3 and
10、a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 03:24:07 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Licensed Cop
11、y: sheffieldun sheffieldun, na, Mon Nov 27 03:24:07 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 11512:1995 ii BSI 02-2000 Contents Page Forewordiii 1Scope1 2Normative references1 3Definitions1 4General requirements2 4.1Required brake systems2 4.2Brake controls2 4.2.1General2 4.2.2Release and r
12、eapplication2 4.2.3Automatic application2 4.2.4Control forces2 4.3Common components2 5Test conditions2 5.1Test course2 5.2Test preparations2 5.3Instrumentation2 5.4Brake retarding force3 6Test and performance criteria for brake systems3 6.1Towing test for service and secondary brakes3 6.1.1Service b
13、rake performance criteria3 6.1.2Secondary brake performance criteria3 6.2Static pull test for parking brake3 6.2.1Parking brake performance criteria3 6.2.2Criteria for brakes remaining applied3 Table 1 Maximum test force levels2 Table 2 Instrument accuracy levels2 Table 3 Performance criteria for br
14、ake systems3 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 03:24:07 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 11512:1995 BSI 02-2000iii Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The w
15、ork of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-govern
16、mental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for vot
17、ing. 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 ISO/TC 23, Tractors and machinery for agriculture and forestry, Subcommittee SC 15, Machinery for forestry. Licen
18、sed Copy: sheffieldun sheffieldun, na, Mon Nov 27 03:24:07 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iv blank Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 03:24:07 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 11512:1995 BSI 02-20001 1 Scope This International Standard specifies perfo
19、rmance 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 forestry machines defined in ISO 6814 with a maximum design speed,
20、determined in accordance with ISO 6014, of 20 km/h or less. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All standards are
21、subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO 6014:1986
22、, Earth-moving machinery Determination of ground speed. ISO 6814:1983, Machinery for forestry Mobile and self-propelled machinery Identification vocabulary. 3 Definitions For the purposes of this International Standard, the following definitions apply. 3.1 brake system All the components which combi
23、ne together to stop and/or hold the machine. NOTE 1Such 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 primary system used for stopping and holding the machine 3.1.2 secondary brake system system used
24、 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 3.2 Brake system components 3.2.1 control component directly activated by the operator to cause a force to be transmitted
25、 to the brake(s) 3.2.2 brake actuation system all of the components between the control(s) and the brake(s) which connect them functionally 3.2.3 brake components which directly apply a force to oppose movement of the machine NOTE 2The brakes may, for example, be of friction, electrical or fluid typ
26、es. 3.3 common component component that performs a function in two or more brake systems 3.4 brake retarding force decelerating or holding force due to brake system action plus rolling resistance, but excluding engine torque NOTE 3In practice, this is the force measured in the tow-line between a mac
27、hine with the test brake(s) applied and a pulling machine. 3.5 machine mass, m mass of a machine including the heaviest combination of manufacturer-approved equipment (i.e. winch, dozer, felling head, grapple, etc.) and components (i.e. cab, protective structures, etc.); an operator of 75 kg; full f
28、uel, lubricating, hydraulic and cooling systems; the manufacturers rated payload, in the case of forwarders. 3.6 slope capability, maximum slope, between 25 and 45, which the machine in transport mode as specified in 5.2 can ascend unaided with a ground friction coefficient, , of 1, without exceedin
29、g its static tipping angle NOTE 4The slope capability may be determined on a prepared slope, or by tractive pulling force as specified in 5.1, where is calculated as follows: where Fis the pulling force, in newtons; mis the machine mass (3.5), in kilograms; gis the gravitational constant (g = 9,81 m
30、/s2). arcsin F mg - -= Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 03:24:07 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 11512:1995 2 BSI 02-2000 4 General requirements The following requirements for brake systems apply to all crawler machines specified in clause 1. 4.1 Required brak
31、e 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 a clutch or shiftable gearbox which allows disabling of the brake(s). This requirement does no
32、t apply to devices specified in 4.1.3 and 4.1.4. 4.1.3 Brake disconnecting devices designed to allow movement of disabled machines shall be located outside the operators station unless they can be reapplied immediately. 4.1.4 A power source disconnect designed for cold-weather starting which also di
33、sables a brake system shall require application of the parking brake prior to disconnection. 4.2 Brake controls 4.2.1 General All brake system controls shall be capable of being applied by a person sitting in the operators seat. 4.2.2 Release and reapplication The secondary and parking brake system(
34、s) control(s) shall be arranged so that they cannot be released from the operators seat once they have been applied unless they can be reapplied immediately from the operators seat. 4.2.3 Automatic application Secondary and parking brake systems may be applied automatically. 4.2.4 Control forces The
35、 force applied to the brake control shall not exceed the levels given in Table 1 when the required brake system performance in Table 3 is measured. Table 1 Maximum test force levels 4.3 Common components Brake systems may use common components; however, failure of any single component shall not redu
36、ce 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 3 % transversely. Th
37、e 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 can be supported with only nominal sinkage. 5.2 Test preparations The machine
38、 mass shall be as specified in 3.5. All parameters relating to braking systems (brake adjustment, 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 for towing or pulling sh
39、all 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 testing is permissible.
40、 The burnishing procedure shall be indicated 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 operated until the machine fluids, i.e. engine and transmission oils, are at normal operating te
41、mperature as specified by the manufacturer. 5.3 Instrumentation Instrumentation to measure and record the parameters within the accuracy specified in Table 2 shall be provided. Table 2 Instrument accuracy levels Type of control Force max. N Finger grasp (flip levers, switches) Hand grasp: upwards fo
42、re-aft, sidearm pull, downward Foot treadle (ankle control) Foot pedal (leg control: power-assisted or not) 20 400 300 350 600 Parameter measured Accuracy % Brake system pressure Machine mass Brake control actuating force Slope Brake retarding force 2 2 1 1 1 Licensed Copy: sheffieldun sheffieldun,
43、na, Mon Nov 27 03:24:07 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 11512:1995 BSI 02-20003 5.4 Brake retarding force A means (normally another machine) to generate the towing or pulling force required by the performance tests in 6.1.1, 6.1.2 and 6.2.1 shall be provided. 6 Test and performance
44、 criteria for brake systems 6.1 Towing test for service and secondary brakes The service and secondary brake performance shall be tested by towing the machine with the transmission control in neutral at a speed of 10 % to 40 % of the maximum level surface speed determined in accordance with ISO 6014
45、. Apply the brake(s) and measure the brake retarding and brake control forces. Machines designed with hydrostatic brakes or automatic 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)
46、being tested by placing the appropriate control in the braking position or neutral. 6.1.1 Service brake performance criteria Application of the service brake system with the force specified in Table 1 shall cause the moving test machine to develop a brake retarding force as specified in Table 3 in b
47、oth the forward and reverse directions. Table 3 Performance criteria for brake systems 6.1.2 Secondary brake performance criteria Since tracked machines have two independent brakes of nominally equal capacity, application of the secondary brake system with the force specified in Table 1 shall cause
48、at least one track on the moving test machine to develop a brake retarding force equal to the value specified in Table 3, 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 th
49、e parking brake applied and the transmission control in neutral. Measure the static brake retarding and brake control forces. 6.2.1 Parking brake performance criteria Application of the parking brake system with the force specified in Table 1 shall hold the test machines tracks stopped and develop a static pulling force as specified in Table 3 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 brak