1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS ISO 5294:2012Synchronous belt drives PulleysBS ISO 5294:2012 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 5294:2012.The UK participat
2、ion in its preparation was entrusted to Technical Committee MCE/10, Belts b) pulley dimensions and tolerances;c) quality specification.As far as dimensions are concerned, the pulleys specified in this International Standard are used interchangeably with the belts specified in ISO 5296.2 Normative re
3、ferencesThe following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 254, Belt drives Pulleys Quality, fini
4、sh and balanceISO 1101, Geometrical product specifications (GPS) Geometrical tolerancing Tolerances of form, orientation, location and run-outISO 5296, Synchronous belt drives Belts with pitch codes MXL, XXL, XL, L, H, XH and XXH Metric and inch dimensions3 Tooth dimensions3.1 Involute teeth3.1.1 Th
5、e involute tooth profile results in different dimensions for each pulley diameter. Therefore, to specify the involute tooth dimensions would require a very voluminous table. For this reason, as well as because of the difficulty in specifying the curved side of an involute tooth, dimensions are speci
6、fied for the generating tool rack required to produce the involute tooth.3.1.2 Dimensions and tolerances for the generating tool rack for synchronous pulleys with involute teeth are given in Table 1 and Figure 1. ISO 2012 All rights reserved 1BS ISO 5294:2012ISO 5294:2012(E)Figure 1 Generating tool
7、rack for pulleys with involute teeth3.2 Straight-sided teeth3.2.1 Involute teeth are normally recommended for synchronous belt drives. Since straight-sided teeth are in use, their specifications are also included.3.2.2 Dimensions and tolerances for straight-sided teeth (see Figure 2) are given in Ta
8、ble 2.Figure 2 Straight-sided teeth3.3 Pitch-to-pitch tolerancesTolerances on the amount of deviation of pitch between adjacent teeth, and on the summation of deviations within 90 arc of a pulley, are given in Table 3. This tolerance applies to the distance between the same point on either the right
9、 or left corresponding flanks of adjacent teeth.2 ISO 2012 All rights reservedBS ISO 5294:2012ISO 5294:2012(E)Table1 Dimensions and tolerances for generating tool rack for pulleys with involute teethPitch codeNumberof teeth in pulleyZPbAdegrees0,12hrbgr1r22ammin.mm+0,050in.+0,0020mm+0,050in.+0,0020m
10、m0,03in.0,001mm0,03in.0,001mmin.MXL10Z232,0320,0080,0800,000 3280,640,0250,610,0240,300,0120,230,0090,5080,020Z24200,670,026 5XXLZ103,1750,0110,1250,000 4250,840,0330,960,0380,300,0120,280,0110,5080,020XLZ105,0800,0110,2000,000 4251,400,0551,270,0500,610,0240,610,0240,5080,020LZ109,5250,0120,3750,00
11、0 5202,130,0843,100,1220,860,0340,530,0210,7620,030H14Z1912,7000,0150,5000,000 6202,590,1024,240,1671,470,0581,040,0411,3720,054Z201,420,056XHZ1822,2250,0190,8750,000 7206,880,2717,590,2992,010,0791,930,0762,7940,110XXHZ1831,7500,0251,2500,0012010,290,40511,610,4572,690,1062,820,1113,0480,120 ISO 20
12、12 All rights reserved 3BS ISO 5294:2012ISO 5294:2012(E)Table2 Dimensions and tolerances for pulleys with straight-sided teethPitchcodebwhgdegrees1,5rbmax.rt2ammin.mmin.mmin.mmin.mmin.MXL0,840,050,0330,0020690050,002700020,200,250,0100130005,+000500002,+0,5080,020XXL0960005,+003800002,+0840050,00330
13、0020,250,350,0140,300,050,0120,0020,5080,020XL1,320,050,0520,0021650080,006500030,250,410,0160640005,+002500002,+0,5080,020L3,050,100,1200,0042670100,010500040,201,190,0471170013,+00460005,+0,7620,030H4,190,130,1650,0053050130,012000050,201,600,0631600013,+006300005,+1,3720,054XH7,900,150,3110,00671
14、40130,028100050,201,980,0782390013,+009400005,+2,7940,110XXH12,170,180,4790,00710310130,040600050,203,960,1563180013,+012500005,+3,0480,1204 ISO 2012 All rights reservedBS ISO 5294:2012ISO 5294:2012(E)Table 3 Pitch-to-pitch tolerancesOutside diameter doAllowable deviation of pitchBetween any two adj
15、acent teethSummation within a 90 arcmm in. mm in. mm in.do 25,4 do 1 0,03 0,001 0,05 0,00225,4 254,00,01 in. + 0,000 5 in. per inch of outside diameter do 10aFull indicator movement.10 ISO 2012 All rights reservedBS ISO 5294:2012ISO 5294:2012(E)4.3.2 Tolerances on pulley radial circular run-out are
16、given in Table 8.Table 8 Radial circular run-outOutside diameter range doFIMamax.mm in. mm in.do 25,4 do 1 0,05 0,00225,4 203,20,005 in. + 0,000 5 in. per inch of outside diameter do 8aFull indicator movement.4.3.3 Tolerances on pulley parallelism are given in Table 9.Table 9 ParallelismStandard pul
17、ley width designationToleranceMetric dimensions Inch (Imperial) dimensions mm in.3,2 to 38,1 012 to 150 0,03 0,001 250,8 and 76,2 200 and 300 0,04 0,001 6101,6 and 127 400 and 500 0,05 0,002 04.3.4 Tolerances on pulley cylindricity are given in Table 10.Table 10 CylindricityStandard pulley width des
18、ignationToleranceMetric dimensionsInch (Imperial) dimen-sionsmm in.3,2 to 12,7 012 to 050 0,02 0,000 819,1 to 38,1 075 to 150 0,04 0,001 650,8 and 76,2 200 and 300 0,08 0,003 1101,6 and 127 400 and 500 0,12 0,004 75 Quality specificationsThe quality, finish and balance of pulleys shall comply with t
19、he requirements specified in ISO 254. ISO 2012 All rights reserved 11BS ISO 5294:2012ISO 5294:2012(E)6 Pulley designation6.1 Usual pulley designationThe pulley designation consists of the letter P (for pulley), the number of teeth, the pitch code and width designation.EXAMPLE A synchronous pulley of
20、 20 teeth, pitch code H (12,70 mm pitch) and pulley width 100 (25,4 mm) is designated as: P 20 H 1006.2 Alternate method for MXL and XXL pulleysThe pulley designation consists of the letter P (for pulley), the number of teeth, the pitch code and width designation.EXAMPLE A synchronous pulley of 20 t
21、eeth, pitch code XXL (3,175 mm pitch) and pulley width 6,4 (6,4 mm) is designated as: P 20 XXL 6,412 ISO 2012 All rights reservedBS ISO 5294:2012ISO 5294:2012(E)Annex A (normative) A.1 Flange dimensionsThe pulley flange dimensions are given in Table A.1 and Figure A.1.Table A.1 Minimum flange height
22、Pitch codeMinimum flange height hmm in.MXL 0,5 0,02XXL 0,8 0,03XL 1,0 0,04L 1,5 0,06H 2,0 0,08XH 4,8 0,19XXH 6,1 0,24Key1 break sharp corners2 outside diameter, do3 bend diameter, do+0,5 mm min.4 minimum flange height, h5 flange outside diameter, do+2hFigure A.1 Flange dimensions ISO 2012 All rights
23、 reserved 13BS ISO 5294:2012ISO 5294:2012(E)Bibliography1 ISO 5296, Synchronous belt drives Belts with pitch codes MXL, XXL, XL, L, H, XH and XXH Metric and inch dimensions14 ISO 2012 All rights reservedBS ISO 5294:2012BS ISO 5294:2012ISO 5294:2012(E) ISO 2012 All rights reservedICS 21.220.10Price b
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