1、BSI Standards PublicationBS ISO 19347:2015Synchronous belt drives Imperial pitch trapezoidalprofile system Belts andpulleysBS ISO 19347:2015 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 19347:2015.The UK participation in its preparation was entrusted to Tech
2、nicalCommittee MCE/10, Belts b) belt length and width dimensions and tolerances;c) belt length-measurement specifications;d) pulley grooves dimensions and tolerances;e) pulley dimensions and tolerances;f) pulley quality specification.2 Normative referencesThe following documents, in whole or in part
3、, are normatively referenced in this document and are indispensable for its application. 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, finish and bal
4、anceISO 1101, Geometrical product specification (GPS) Geometrical tolerancing Tolerances of form, orientation, location and run-out3 ProfilesSeven profiles for synchronous drives are standardized: MXL, XXL, XL, L, H, XH, XXH.The profiles and the corresponding belt pitches are given in Table 1.1) The
5、se drives have been known under various names in the past, for example: timing belt drives, positive belt drives, gear belt drives. ISO 2015 All rights reserved 1BS ISO 19347:2015ISO 19347:2015(E)Table 1 ProfilesProfilesBelt pitchamm inMXL 2,032 0,080XXL 3,175 0,125XL 5,080 0,200L 9,525 0,375H 12,70
6、0 0,500XH 22,225 0,875XXH 31,750 1,250aCarried to third decimal place because belt pitch is a defined value.4 Belt dimensions and tolerances4.1 Belt tooth dimensionsThe nominal belt tooth dimensions are the same for one-sided and double-sided belts; they are given in Table 2 and are shown in Figures
7、 1, 2, and 3.Two types of double-sided synchronous belts are standardized. Type A (see Figure 2) has symmetrical teeth and Type B (see Figure 3) has staggered teeth.rrrahhstS(see Table 5)Figure 1 Tooth profile, one-sided2 ISO 2015 All rights reservedBS ISO 19347:2015ISO 19347:2015(E)rararrrrhdhthtSS
8、Figure 2 Tooth profile, double-sided (Type A) ISO 2015 All rights reserved 3BS ISO 19347:2015ISO 19347:2015(E)hththdrararrrrSSFigure 3 Tooth profile, double-sided (Type B)Table 2 Nominal tooth dimensionsProfiles 2 degreesS htrrramm in mm in mm in mm inMXL 40 1,14 0,045 0,51 0,02 0,13 0,005 0,13 0,00
9、5XXL 50 1,73 0,068 0,76 0,03 0,2 0,008 0,3 0,012XL 50 2,57 0,101 1,27 0,05 0,38 0,015 0,38 0,015L 40 4,65 0,183 1,91 0,075 0,51 0,020 0,51 0,02H 40 6,12 0,241 2,29 0,09 1,02 0,040 1,02 0,04XH 40 12,57 0,495 6,35 0,25 1,57 0,062 1,19 0,047XXH 40 19,05 0,750 9,53 0,375 2,29 0,090 1,52 0,064.2 Belt pit
10、ch lengths and tolerances4.2.1 Single-sided beltsThe belt pitch length and tolerances are given in Tables 3 and 4.4 ISO 2015 All rights reservedBS ISO 19347:2015ISO 19347:2015(E)Table 3 Pitch lengths and tolerances Profiles XL, L, H, XH, XXHBelt length designationPitch length Tolerance Number of tee
11、th for standard lengthsmm in mm in XL L H XH XXH60708090100152,40177, 80203,20228,60254,006,0007,0008,0009,00010,0000,410,410,410,410,410,0160,0160,0160,0160,0163035404550110120124130140279,40304,80314,33330,20355,6011,00012,00012,37513,00014,0000,460,460,460,460,460,0180,0180,0180,0180,018556065703
12、3 150160170180187381,00406,40431,80457, 20476,2515,00016,00017,00018,00018,7500,460,510,510,510,510,0180,0200,0200,0200,020758085904050190200210220225482,60508,00533,40558,80571,5019,00020,00021,00022,00022,5000,510,510,610,610,610,0200,0200,0240,0240,024951001051105660230240250255260584,20609,60635
13、,006 47,70660,4023,00024,00025,00025,50026,0000,610,610,610,610,610,0240,0240,0240,0240,024115120125130646848270285300322330685,80723,90762,00819,15838,2027,00028,50030,00032,25033,0000,610,610,610,660,660,0240,0240,0240,0260,02672768086546066345360367390420876,30914,40933,45990,601 066,8034,50036,0
14、0036,75039,00042,0000,660,660,660,660,760,0260,0260,0260,0260,0309298104112727884 ISO 2015 All rights reserved 5BS ISO 19347:2015ISO 19347:2015(E)Belt length designationPitch length Tolerance Number of teeth for standard lengthsmm in mm in XL L H XH XXH4504805075105401 143,001 219,201 289,051 295,40
15、1 371,6045,00048,00050,75051,00054,0000,760,760,810,810,810,0300,0300,0320,0320,032120128136144909610210858 5605706006306601 422,401 4 47, 801 524,001 600,201 676,4056,00057,00060,00063,00066,0000,810,810,810,860,860,0320,0320,0320,0340,03416011412012613264727007507708008401 778,001 905,001 955,802
16、032,002 133,6070,00075,00077,00080,00084,0000,860,910,910,910,970,0340,0360,0360,0360,03814015016080889656648509009801 0001 1002 159,002 286,002 489,202 540,002 794,0085,00090,00098,000100,000110,0000,970,971,021,021,070,0380,0380,0400,0400,04217018020022011272801 1201 2001 2501 2601 4002 844,803 04
17、8,003 175,003 200,403 556,00112,000120,000125,000126,000140,0001,121,121,171,171,220,0440,0440,0460,0460,048250280128144160961121 5401 6001 7001 7501 8003 911,604 064,004 318,004 445,004 572,00154,000160,000170,000175,000180,0001,321,321,371,421,420,0520,0520,0540,0560,056340176200128144Table 3 (con
18、tinued)6 ISO 2015 All rights reservedBS ISO 19347:2015ISO 19347:2015(E)Table 4 Pitch lengths and tolerances MXL and XXL belt sectionsBelt length designationPitch length ToleranceNumber of teeth for standard lengthsmm in mm in MXL XXL36,040,044,048,050,056,091,44101,60111,76121,92127,00142,243,6004,0
19、004,4004,8005,0005,6000,410,410,410,410,410,410,0160,0160,0160,0160,0160,01645505560704060,064,070,072,080,088,0152,40162,56177, 80182,88203,20223,526,0006,4007,0007, 2008,0008,8000,410,410,410,410,410,410,0160,0160,0160,0160,0160,01675809010011048566490,0100,0110,0112,0120,0124,0228,60254,00279,402
20、84,48304,80314,969,00010,00011,00011,20012,00012,4000,410,410,460,460,460,460,0160,0160,0180,0180,0180,01812514015572808896130,0140,0150,0160,0180,0200,0220,0330,20355,60381,00406,40457, 20508,00558,8013,00014,00015,00016,00018,00020,00022,0000,460,460,460,510,510,510,610,0180,0180,0180,0200,0200,02
21、00,0241752002252501041121201281441601764.2.2 Double-sided beltsThe nominal belt lengths for the double-sided belts are the same as those listed in Tables 3 and 4 for the single-sided belts. The positive length tolerance is equal to 1,5 times the tolerance of the equivalent single-sided belt. The neg
22、ative tolerance is equal to 2 times the tolerance of the equivalent single-sided belt.4.3 Belt standard widths and heightsThe belt standard widths and tolerances are given in Table 5. The nominal heights for single-sided belts are also given in Table 5, while the nominal heights for double-sided bel
23、ts are given in Table 6. ISO 2015 All rights reserved 7BS ISO 19347:2015ISO 19347:2015(E)Table 5 Widths and heights single-sided beltsProfilesNominal height (see Figure 1) hsStandard widths Tolerances on width for belt pitch lengthsDimensionDesignationup to 838,2 mm (33 in) inclusivefrom 838,2 mm (3
24、3 in) up to 1 676,4 mm (66 in) inclusiveover 1 676,4 mm (66 in)mm in mm in mm in mm in mm inMXL 1,14 0,0453,24,86,40,1250,1900,250012a019025+0,50,8+0,020,03XXL 1,52 0,063,24,86,40,1250,1900,250012a019025+0,50,8+0,020,03XL 2,3 0,096,47,99,50,2500,3100,375025031037a+0,50,8+0,020,03L 3,6 0,1412,719,125
25、,40,50,751050075100+0,80,8+0,030,03+0,81,3+0,030,05H 4,3 0,1719,125,438,10,7511,5075100150+0,80,8+0,030,03+0,81,3+0,030,05+0,81,3+0,030,0550,8 2 200+0,81,3+0,030,05+1, 31,3+0,050,05+1, 31,5+0,050,0676,2 3 300+1, 31,5+0,050,06+1,51,5+0,060,06+1,52+0,060,08XH 11,2 0,4450,876,2101,6234200300400+4,84,8+
26、0,190,19+4,84,8+0,190,19XXH 15,7 0,6250,876,2101,61272345200300400500+4,84,8+0,190,19aDesignations are 012 and 037 although the widths of belts is 0,125 in and 0,375 in.8 ISO 2015 All rights reservedBS ISO 19347:2015ISO 19347:2015(E)Table 6 Double-sided beltsProfilesNominal height (see Figures 2 and
27、 3) hdmm inMXL 1,53 0,060XXL 2,03 0,080XL 3,05 0,120L 4,58 0,180H 5,95 0,234XH 15,49 0,610XXH 22,10 0,8705 Belt designation5.1 Single-sided belts5.1.1 GeneralSynchronous belts are identified by a standard number. The first digits specify the pitch length which for the XL and larger pitch belts conta
28、ined in this standard is the calculated pitch length in inches (the pitch length in millimetres divided by 25,4) times 10 rounded off to the nearest whole integer. For MXL and XXL belts, it is the calculated pitch in inches (the pitch length in millimetres divided by 25,4) times 10 rounded off to th
29、e nearest tenth. The pitch length is followed by the profiles designation. The digits following the profile designation represent the nominal belt width in inches times 100 rounded off to the nearest 3 digits.EXAMPLE An L section synchronous belt of 762 mm (30,000 in) pitch length and 19,1 mm (0,750
30、 in) width is designated:300L075An MXL section synchronous belt of 102 teeth corresponding to a pitch length of 207,26 mm (8,16 in) and 6,35 mm (0,25 in) width is designated:816MXL0255.1.2 Alternate method for MXL and XXL beltsThe belt in accordance with this International Standard may be designated
31、 by the following:a) letter B (for belt);b) number of teeth;c) profile;d) width designation, in millimetres, rounded to the nearest tenth.EXAMPLE An MXL section synchronous belt of 102 teeth and 6,35 mm width is designated: B 102MXL6.4 ISO 2015 All rights reserved 9BS ISO 19347:2015ISO 19347:2015(E)
32、5.2 Double-sided belts5.2.1 Type A symmetricalA belt of Type A, corresponding to Figure 2, shall be designated by the following:a) letter D (for double-sided);b) type designation;c) length designation;d) profile,e) width designation.EXAMPLE A Type A synchronous belt of pitch length 42 in (1 066,8 mm
33、), pitch 0,375 in (9,525 mm) and nominal width 0,5 in (12,7 mm) is designated: DA 420 L 0505.2.2 Type B staggeredThe belt designation for Type B belts corresponding Figure 1 c) is similar to 4.2.1 except that a B replaces the A.EXAMPLE A Type B synchronous belt of pitch length 98 in (2 489,2 mm), pi
34、tch 0,875 in (22,225 mm) and nominal width 2 in (50,8 mm) is designated: DB 980 XH 2005.3 Designation of pitch length of non-standardized lengthsThe length designation for belts in non-standardized lengths that are not contained in Tables 3 and 4 shall be established from the pitch length in millime
35、tres divided by 2,54. This number shall be rounded as follows:a) for belts with profile MXL to the first decimal: for example belt MXL with 102 teeth corresponding to pitch length 207,26 mm: length designation 816.An alternative method for belts with profile MXL or XXL consists of using the letter B
36、 (for belt) followed by the number of teeth, which gives the length designation B 102.b) for belts with profile XL to XXH to the nearest integral number, where 0,5 will be rounded down, for example belt L with 130 teeth corresponding to pitch length 1 238,25 mm: length designation 487.6 Belt pitch l
37、ength measurement6.1 Measuring fixtureThe pitch length of a synchronous belt shall be determined by placing the belt on a measuring fixture composed of the following elements (see Figure 5).6.1.1 Two pulleysTwo pulleys of equal diameter as specified in Table 7, of the proper pitch code, and having s
38、tandard tooth space dimensions. These pulleys shall be made to the tolerances shown in Table 7 and have the proper clearance, Cm, between the pulley tooth space and the theoretical belt tooth width as specified in Table 7 (see Figure 4). One pulley shall be free to rotate on a fixed-position shaft,
39、while the other shall be free to rotate on a movable shaft to permit the centre distance to change.10 ISO 2015 All rights reservedBS ISO 19347:2015ISO 19347:2015(E)C12mKey1 belt2 pulleyFigure 4 Clearance between measuring pulley and belt21Key1 centre distance2 total measuring forceFigure 5 Pitch len
40、gth measuring fixture ISO 2015 All rights reserved 11BS ISO 19347:2015ISO 19347:2015(E)Table 7 Belt pitch length measuring pulleysProfilesNumber of teethPitch circumferenceOutside diameteraRadial run-out FIMbAxial run-out FIMbMinimum clearance Cmmm in mm in mm in mm in mm inMXL 20 40,64 1,612,4280,0
41、130,489 30,000 50,013 0,000 5 0,025 0,001 0,25 0,010XXL 16 50,8 215,6620,0130,616 60,000 50,013 0,000 5 0,025 0,001 0,3 0,012XL 10 50,8 215,6620,0130,616 60,000 50,013 0,000 5 0,025 0,001 0,3 0,012L 16 152,4 647,7480,0131,879 90,000 50,013 0,000 5 0,025 0,001 0,33 0,013H 20 254 1079,4790,0133,129 10
42、,000 50,013 0,000 5 0,025 0,001 0,38 0,015XH 24 533,4 21166,9920,0256,574 50,0010,013 0,000 5 0,051 0,002 0,53 0,021XXH 24 762 30239,5040,0259,429 30,0010,013 0,000 5 0,076 0,003 0,64 0,025aPulleys outside of the specified diameter tolerance range may be used, if the resulting belt length measuremen
43、ts are corrected for the actual pulley diameters used.bFIM: full indicator movement.6.1.2 Means of applying a total measuring force to the movable pulley.6.1.3 Means of measuring the centre distance between the two pulleys, with the necessary degree of accuracy to check the permitted tolerances (tol
44、erances for centre distance measurement correspond to half the permitted length tolerances in accordance with Tables 3 and 4).6.2 Total measuring forceThe total measuring force to be applied for the measurement of belts is given in Table 8. Consult with belt manufacture for measuring force to be use
45、d with belts of non-standard width.12 ISO 2015 All rights reservedBS ISO 19347:2015ISO 19347:2015(E)Table 8 Total measuring forceBelt width designationBelt widthMeasuring force for profileMXL XXL XL L H XH XXHmm in N Ibf N Ibf N Ibf N Ibf N Ibf N Ibf N Ibf012 019 025 031 0373,2 4,8 6,4 7,9 9,50,125
46、0,190 0,250 0,310 0,37513 20 27 3 4,5 6 14 22 31 3,2 5,0 7,0 36 44 538 10 12050 07512,7 19,10,5 0,75105 18024 40445100100 150 20025,4 38,1 50,81 1,5 2245 55 620 980 1 340140 220 3002 0004502 500560300 400 50076,2 101,6 1273 4 52 100 470 3 100 4 450 700 1 000 3 900 5 600 7 100875 1 250 1 6007 Pulley
47、groove dimensions7.1 Involute grooves7.1.1 The involute groove profile results in different dimensions for each pulley diameter. Therefore, to specify the involute groove dimensions would require a very voluminous table. For this reason, as well as because of the difficulty in specifying the curved
48、side of an involute groove, dimensions are specified for the generating tool rack required to produce the involute groove.7.1.2 Dimensions and tolerances for the generating tool rack for synchronous pulleys with involute grooves are given in Table 9 and Figure 6.PbhraAAbrr12gFigure 6 Generating tool rack for pulleys with involute grooves ISO 2015 All rights reserved 13BS ISO 19347:2015ISO 19347:2015(E)Table 9 Dimensions and tolerances for generating tool rack for pulleys with involute groovesProfilesNumber of grooves in pulley ZPbA degrees 0,12hrbgr1r22amm i
