1、BRITISH STANDARD BS ISO 11512:1995 Implementation of ISO11512:1995 Machinery for forestry Trackedspecial machines Performance criteria for brake systems ICS 65.060.80BSISO11512:1995 This BritishStandard, having been prepared under the directionof the Engineering SectorBoard, was published underthe a
2、uthority of the Standards Board and comesintoeffect on 15July1996 BSI 02-2000 The following BSI references relate to the work on this standard: Committee reference AGE/29 Draft for comment93/705954DC ISBN 0 580 25969 2 Committees responsible for this BritishStandard The preparation of this BritishSt
3、andard was entrusted to Technical Committee AGE/29, Forestry machinery, upon which the following bodies were represented: Agricultural Engineers Association Arboricultural Association Consumers Association Department of Trade and Industry (Consumer safety unit, CA Division) Forestry Commission Healt
4、h and Safety Executive Hire Association Europe Institution of Agricultural Engineers Incorporated National Farmers Union Co-opted members Amendments issued since publication Amd. No. Date CommentsBSISO11512:1995 BSI 02-2000 i Contents Page Committees responsible Inside front cover National foreword
5、ii Foreword iii Text of ISO11512 1BSISO11512:1995 ii BSI 02-2000 National foreword This BritishStandard reproduces verbatim ISO11512:1995 and implements it as the UK national standard. This BritishStandard is published under the direction of the Engineering Sector Board whose Technical Committee AGE
6、/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 developments and promulgate them in the UK. NOT
7、EInternational and European Standards, as well as overseas standards, are available from Customer Services, BSI,389 Chiswick High Road, London W44AL. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correc
8、t 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, pagesi andii, theISO title page, pagesii toiv, pages1 to3 and a back cover. This standard has been updated (see
9、copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.BSISO11512:1995 ii BSI 02-2000 Contents Page Foreword iii 1 Scope 1 2 Normative references 1 3 Definitions 1 4 General requirements 2 4.1 Required brake systems 2 4.2 Bra
10、ke controls 2 4.2.1 General 2 4.2.2 Release and reapplication 2 4.2.3 Automatic application 2 4.2.4 Control forces 2 4.3 Common components 2 5 Test conditions 2 5.1 Test course 2 5.2 Test preparations 2 5.3 Instrumentation 2 5.4 Brake retarding force 3 6 Test and performance criteria for brake syste
11、ms 3 6.1 Towing test for service and secondary brakes 3 6.1.1 Service brake performance criteria 3 6.1.2 Secondary brake performance criteria 3 6.2 Static pull test for parking brake 3 6.2.1 Parking brake performance criteria 3 6.2.2 Criteria for brakes remaining applied 3 Table 1 Maximum test force
12、 levels 2 Table 2 Instrument accuracy levels 2 Table 3 Performance criteria for brake systems 3BSISO11512:1995 BSI 02-2000 iii Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing Internati
13、onal 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-governmental, in liaison with IS
14、O, 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 voting. Publication as an Int
15、ernational Standard requires approval by at least75% of the member bodies casting a vote. International Standard ISO11512 was prepared by Technical Committee ISO/TC23, Tractors and machinery for agriculture and forestry, Subcommittee SC15, Machinery for forestry.iv blankBSISO11512:1995 BSI 02-2000 1
16、 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 forestry machin
17、es defined in ISO6814 with a maximum design speed, determined in accordance with ISO6014, of20km/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 e
18、ditions indicated were valid. All standards are 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 curren
19、tly valid International Standards. ISO6014:1986, Earth-moving machinery Determination of ground speed. ISO6814:1983, Machinery for forestry Mobile and self-propelled machinery Identification vocabulary. 3 Definitions For the purposes of this International Standard, the following definitions apply. 3
20、.1 brake system All the components which combine 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 ma
21、chine 3.1.2 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 3.2 Brake system components 3.2.1 control component directly activated by t
22、he operator to cause a force to be transmitted 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 ex
23、ample, be of friction, electrical or fluid types. 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 th
24、e force measured in the tow-line between a machine 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 stru
25、ctures, etc.); an operator of75kg; full fuel, lubricating, hydraulic and cooling systems; the manufacturers rated payload, in the case of forwarders. 3.6 slope capability, maximum slope, between25 and45 , which the machine in transport mode as specified in5.2 can ascend unaided with a ground frictio
26、n coefficient, , of1, without exceeding its static tipping angle NOTE 4The slope capability may be determined on a prepared slope, or by tractive pulling force as specified in5.1, where is calculated as follows: where F is the pulling force, in newtons; m is the machine mass(3.5), in kilograms; g is
27、 the gravitational constant (g =9,81m/s 2 ). arcsin F mg - =BSISO11512:1995 2 BSI 02-2000 4 General requirements The following requirements for brake systems apply to all crawler machines specified in clause1. 4.1 Required brake systems 4.1.1 All machines shall be equipped with a) a service brake sy
28、stem; 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 not apply to devices specified in4.1.3 and4.1.4. 4.1.3 Brake disconnecting
29、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 disables a brake system shall require application of the parking brake prior
30、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(s) control(s) shall be arranged so that they cannot be released from the op
31、erators 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 force applied to the brake control shall not exceed the levels given in Ta
32、ble 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 reduce the effectiveness of the machines stopping capability to less than the s
33、econdary brake system performance as defined in6.1.2. 5 Test conditions 5.1 Test course The test course shall be relatively flat and smooth with a slope no greater than1% in the direction of travel, or3% transversely. The course shall be of sufficient size, materials and conditions to provide the tr
34、action required for the towing and pulling tests in clause6. 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 mass shall be as specified in3.5. All parameters relating to braking systems (br
35、ake 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 shall be made as low as possible on the drawbar or other appropriate connecting poin
36、t(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. The burnishing procedure shall be indicated in the operators manual for the machi
37、ne 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 temperature as specified by the manufacturer. 5.3 Instrumentation Instrumentation to
38、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 fore-aft, sidearm pull, downward Foot treadle (ankle control) Foot pedal (leg control
39、: 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 1BSISO11512:1995 BSI 02-2000 3 5.4 Brake retarding force A means (normally another machine) to generate the towing or pulling
40、 force required by the performance tests in6.1.1, 6.1.2 and6.2.1 shall be provided. 6 Test and performance 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 ne
41、utral at a speed of10% to40% of the maximum level surface speed determined in accordance with ISO6014. 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 ma
42、y be tested by driving at the same speed as the towing machine and then applying the brake system(s) 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
43、1 shall cause the moving test machine to develop a brake retarding force as specified in Table 3 in both 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
44、 capacity, application of the secondary brake system with the force specified in Table 1 shall cause 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
45、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 control forces. 6.2.1 Parking brake performance criteria Application of the parking brake
46、 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 pa
47、rking brake performance specified in Table 3 regardless of any contraction of the brake parts or leakage of any kind. This system shall not be dependent upon an exhaustible energy source. Brake system Brake retarding force N Service Secondary Parking 9,8m sin 4,9m sin 9,8m sin (dynamic) (dynamic) (s
48、tatic) m is the machine mass in kilograms (see3.5) is the slope capability in degrees (see3.6)BS ISO 11512:1995 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStandards. It presents the UK view on standard
49、s in Europe and at the international level. It is incorporated by Royal Charter. Revisions BritishStandards are updated by amendment or revision. Users of BritishStandards should make sure that they possess the latest amendments or editions. It is the constant aim of BSI to improve the quality of our products and services. We would be grateful if anyone finding an inaccuracy or ambiguity while using this BritishStandard would inform the Secretary of the technical committee responsible, the identity
