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1、BRITISH STANDARD BS 6916-5: 1988 ISO 6535:1983 Chain saws Part 5: Methods of evaluating chain brake performance ISO title: Forestry machinery Portable chain saws Chain brake Performance UDC 674.053:621.93:621.932.5:621.936.6:.004.15 Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 13:07:47 GMT
2、+00:00 2006, Uncontrolled Copy, (c) BSI BS 6916-5:1988 This British Standard, having been prepared under the direction of the Agricultural Machinery and Implements Standards Committee, was published under the authority of the Board of BSI and comes into effect on 30 December 1988 BSI 11-1999 The fol
3、lowing BSI references relate to the work on this standard: Committee reference AGE/29 Draft for comment 81/79897 DC ISBN 0 580 16325 3 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Agricultural Machinery and Implements Standards Commit
4、tee (AGE/-) to Technical Committee AGE/29, upon which the following bodies were represented: Arboricultural Association British Agricultural and Garden Machinery Association Ltd. Consumer Policy Committee of BSI Consumers Association Department of Trade and Industry (Consumer Safety Unit, CA Divisio
5、n) Forestry Commission Health and Safety Executive National Farmers Union National Union of Agricultural and Allied Workers Amendments issued since publication Amd. No.Date of issueComments Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 13:07:47 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS
6、6916-5:1988 BSI 11-1999i Contents Page Committees responsibleInside front cover National forewordii 1Scope and field of application1 2Apparatus1 3Preparations1 4Measuring objects1 5Test procedure1 Figure Static test of release force2 Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 13:07:47 GM
7、T+00:00 2006, Uncontrolled Copy, (c) BSI BS 6916-5:1988 ii BSI 11-1999 National foreword This Part of BS 6916 has been prepared under the direction of the Agricultural Machinery and Implements Standards Committee. It is identical with ISO 6535:1985 “Forestry machinery Portable chain saws Chain brake
8、 Performance” prepared by Technical Committee ISO/TC 23, Tractors and machinery for agriculture and forestry, of the International Organization for Standardization (ISO). Other Parts of BS 6916 are as follows: Part 1: Glossary of terms; Part 2: Method for specifying requirements; Part 3: Specificati
9、on for dimensions of front hand guards; Part 4: Specification for strength of front hand guards; Part 6: Method of measurement of airborne noise at the operators position; Part 7: Method of evaluating engine performance including fuel consumption; Part 8: Method of measurement of hand-transmitted vi
10、bration; Part 9: Specification for strength of handles; Part 10: Specification for longitudinal balance; Part 11: Specification for general design, performance, safety and construction requirements for internal combustion engined machines1). Terminology and conventions. The text of the International
11、 Standard has been approved as suitable for publication as a British Standard without deviation. Some terminology and certain conventions are not identical with those used in British Standards; attention is drawn especially to the following. The comma has been used as a decimal marker. In British St
12、andards it is current practice to use a full point on the baseline as the decimal marker. Where the words “International Standard” appear, referring to this standard, they should be read as “Part of BS 6916”. A British Standard does not purport to include all the necessary provisions of a contract.
13、Users of British 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, pages 1 and 2 and a back cover. This
14、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. 1) In preparation. Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 13:07:47 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6916-5:19
15、88 BSI 11-19991 1 Scope and field of application This International Standard specifies methods for measuring the braking time and release force of manually-operated chain brakes on portable hand-held chain saws. 2 Apparatus 2.1 Rotational speed indicator with a rotating speed reading accuracy of 2,5
16、 %. 2.2 Time recording device, including pick-ups, having an accuracy of 5 ms. 2.3 Pick-up device for registering the brake arm activation. 2.4 Pick-up device for registering the chain motion. 2.5 Force gauge having an accuracy of 1 N. 2.6 Pendulum having a mass of 0,7 kg, a length of 0,7 m and a di
17、ameter of 50 mm. 3 Preparations The chain saw shall be adjusted for best cutting performance in accordance with the manufacturers recommendations. During the test, the saw shall be rigidly mounted by the bar pad or the handles.2) Initially, the brake friction surfaces shall be in a dry and unlubrica
18、ted condition. The ambient temperature shall be 20 5 C. 4 Measuring objects Measurements shall be carried out on three different normal production saws of the same model with specified guide bar and chain. The engine shall have been run in before the test in 5.1 is commenced and the carburettor and
19、ignition adjusted according to the instructions of the manufacturer. 5 Test procedure 5.1 Braking time The brake shall be released with a blow from the pendulum. The pendulum shall strike the guard from a drop height of 0,2 m. The throttle shall be kept in a fixed position during the braking. This p
20、osition shall correspond to the manufacturers rated speed for maximum power plus 33 % or full throttle (racing speed), whichever is less. When the chain has stopped after braking, the throttle shall be adjusted to an idling position and the brake reset. The braking time is defined as the interval fr
21、om the instant the pendulum hits the brake to the instant the saw chain ceases to move. No readings shall be excluded. No brake adjustment of any kind shall be made during the test. The measurement shall be carried out according to the following procedure. 5.1.1 Warm up the engine. 5.1.2 First test
22、5.1.2.1 Run the engine for 4 min 45 s at maximum power speed. 5.1.2.2 Run the engine for 15 s at racing speed. 5.1.2.3 Make one brake and record the braking time. 5.1.3 Second test 5.1.3.1 Run the engine idling for 3 min. 5.1.3.2 Run the engine for 1 min 45 s at maximum power speed. 5.1.3.3 Run the
23、engine for 15 s at racing speed. 5.1.3.4 Make one brake and record the braking time. 5.1.3.5 Repeat 5.1.3.1 to 5.1.3.4 three times. 5.1.4 Third test 5.1.4.1 Run the engine at racing speed. 5.1.4.2 Make 15 blind brakes at 10 to 20 second intervals. 5.1.4.3 Make 5 brakes at the same 10 to 20 second in
24、tervals and record the braking time. 5.1.5 Report the average value of 5.1.2, 5.1.3 and 5.1.4.3) 5.1.6 Report the highest value of 5.1.2 and 5.1.3. 5.2 Release force (static test)4) With the engine not running, the force on the brake arm needed to activate the brake shall be measured in the directio
25、n of 45 forward and downward in relation to the guide bar centre line at the centre of the top (horizontal) part of the brake arm. The force shall be applied at a uniform rate (see the Figure). 2) It should be stated in the test report in which way the saw has been mounted. 3) Recommended performanc
26、e: the braking time should not exceed 0,12 s average and 0,15 s maximum. 4) An International Standard specifying a method for measuring the release force with the engine running is foreseen. Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 13:07:47 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS
27、 6916-5:1988 2 BSI 11-1999 Figure Static test of release force Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 13:07:47 GMT+00:00 2006, Uncontrolled Copy, (c) BSI blank Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 13:07:47 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6916-5: 1988 I
28、SO 6535:1983 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter. Revisions Brit
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