1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationSynchronous belt drives Belts with pitch codes MXL, XXL, XL, L, H, XH and XXH Metric and inch dimensionsBS ISO 5296:2012National forewordThis British Standard is the UK implement
2、ation of ISO 5296:2012. Together with BS ISO 5294, it supersedes BS 4548:1987, which will be withdrawn on publication of BS ISO 5294.The UK participation in its preparation was entrusted to Technical Committee MCE/10, Belts b) length and width dimensions;c) tolerances on these dimensions;d) length-m
3、easurement specifications.This International Standard is applicable to synchronous belt drives with pitch codes MXL, XXL, XL, L, H, XH and XXH, in both metric and inch dimensions.2 Pitch codesThe pitch codes and the corresponding belt pitches are given in Table 1.Table 1 Pitch codesPitch codeBelt pi
4、tchamm inMXL 2,032 0,080XXL 3,175 0,125XL 5,080 0,200L 9,525 0,375H 12,700 0,500XH 22,225 0,875XXH 31,750 1,250aCarried to the third decimal place because belt pitch is a defined value.3 Dimensions and tolerances3.1 Tooth dimensionsThe nominal belt tooth dimensions are the same for one-sided and dou
5、ble-sided belts; they are given in Table 2 and are shown in Figures 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. ISO 2012 All rights reserved 1BS ISO 5296:2012ISO 5296:2012(E)aSee T
6、able 5.Figure 1 Tooth profile, one-sidedFigure 2 Tooth profile, double-sided Type AFigure 3 Tooth profile, double-sided Type B2 ISO 2012 All rights reservedBS ISO 5296:2012ISO 5296:2012(E)Table 2 Nominal tooth dimensionsPitch code 2 degreess htrrramm in mm in mm in mm inMXLXXLXLLHXHXXH40505040404040
7、1,141,732,574,656,1212,5719,050,0450,0680,1010,1830,2410,4950,7500,510,761,271,912,296,359,530,020,030,050,0750,090,250,3750,130,20,380,511,021,572,290,0050,0080,0150,0200,0400,0620,0900,130,30,380,511,021,191,520,0050,0120,0150,020,040,0470,063.2 Belt pitch lengths and tolerances3.2.1 Single-sided
8、beltsThe belt pitch lengths and tolerances are given in Tables 3 and 4.Table 3 Pitch lengths and tolerances XL, L, H, XH, XXH belt sectionsBelt length designationPitch length Tolerance Number of teeth for standard lengthsmm in mm inXL (0,200)L (0,375)H (0,500)XH (0,875)XXH (1,250)60708090100152,4017
9、7,80203,20228,60254,006,0007,0008,0009,00010,0000,410,410,410,410,410,0160,0160,0160,0160,0163035404550110120124130140279,40304,80314,33330,20355,6011,00012,00012,37513,00014,0000,460,460,460,460,460,0180,0180,0180,0180,0185560657033 150160170180187381,00406,40431,80457,20476,2515,00016,00017,00018,
10、00018,7500,460,510,510,510,510,0180,0200,0200,0200,020758085904050190200210220225482,60508,00533,40558,80571,5019,00020,00021,00022,00022,5000,510,510,610,610,610,0200,0200,0240,0240,024951001051105660 ISO 2012 All rights reserved 3BS ISO 5296:2012ISO 5296:2012(E)Belt length designationPitch length
11、Tolerance Number of teeth for standard lengthsmm in mm inXL (0,200)L (0,375)H (0,500)XH (0,875)XXH (1,250)230240250255260584,20609,60635,00647,70660,4023,00024,00025,00025,50026,0000,610,610,610,610,610,0240,0240,0240,0240,024115120125130646848270285300322330685,80723,90762,00819,15838,2027,00028,50
12、030,00032,25033,0000,610,610,610,660,660,0240,0240,0240,0260,02672768086546066345360367390420876,30914,40933,45990,601 066,8034,50036,00036,75039,00042,0000,660,660,660,660,760,0260,0260,0260,0260,03092981041127278844504805075105401 143,001 219,201 289,051 295,401 371,6045,00048,00050,75051,00054,00
13、00,760,760,810,810,810,0300,0300,0320,0320,032120128136144909610210858 5605706006306601 422,401 447,801 524,001 600,201 676,4056,00057,00060,00063,00066,0000,810,810,810,860,860,0320,0320,0320,0340,03416011412012613264727007507708008401 778,001 905,001 955,802 032,002 133,6070,00075,00077,00080,0008
14、4,0000,860,910,910,910,970,0340,0360,0360,0360,0381401501608088965664850900980100011002 159,002 286,002 489,202 540,002 794,0085,00090,00098,000100,000110,0000,970,971,021,021,070,0380,0380,0400,0400,0421701802002201127280Table 3 (continued)4 ISO 2012 All rights reservedBS ISO 5296:2012ISO 5296:2012
15、(E)Belt length designationPitch length Tolerance Number of teeth for standard lengthsmm in mm inXL (0,200)L (0,375)H (0,500)XH (0,875)XXH (1,250)112012001250126014002 844,803 048,003 175,003 200,403 556,00112,000120,000125,000126,000140,0001,121,121,171,171,220,0440,0440,0460,0460,048250280128144160
16、96112154016001700175018003 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 (continued) ISO 2012 All rights reserved 5BS ISO 5296:2012ISO 5296:2012(E)Table 4 Pitch lengths and tolerances MXL and XXL belt sect
17、ionsBelt length designationPitch length ToleranceNumber of teeth for standard lengthsmm in mm in MXL XXL36,040,044,048,050,056,091,44101,60111,76121,92127,00142,243,6004,0004,4004,8005,0005,6000,410,410,410,410,410,410,0160,0160,0160,0160,0160,01645505560704060,064,070,072,080,088,0152,40162,56177,8
18、0182,88203,20223,526,0006,4007,0007,2008,0008,8000,410,410,410,410,410,410,0160,0160,0160,0160,0160,01675809010011048566490,0100,0110,0112,0120,0124,0228,60254,00279,40284,48304,80314,969,00010,00011,00011,20012,00012,4000,410,410,460,460,460,460,0160,0160,0180,0180,0180,01812514015572808896130,0140
19、,0150,0160,0180,0200,0220,0330,20355,60381,00406,40457,20508,00558,8013,00014,00015,00016,00018,00020,00022,0000,460,460,460,510,510,510,610,0180,0180,0180,0200,0200,0200,0241752002252501041121201281441601763.2.2 Double-sided beltsThe nominal belt lengths for the double-sided belts are the same as t
20、hose listed in Tables 3 and 4 for the single-sided belts. The positive length tolerance is equal to one and a half times the tolerance of the equivalent single-sided belt. The negative tolerance is equal to two times the tolerance of the equivalent single-sided belt.3.3 Widths and heightsThe belt wi
21、dths 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 belts are given in Table 6.6 ISO 2012 All rights reservedBS ISO 5296:2012ISO 5296:2012(E)Table 5 Widths and heights Single-sided beltsPitch codeN
22、ominal heightahsWidth Tolerance on width for belt pitch lengthsDimensionDesignationUp to 838,2 mm (33 in) inclusiveFrom 838,2 mm (33 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 0,0453,24,86,40,120,190,25012019025+0,5 -0,8+0,02 -0,03XXL 1,52 0,06
23、3,24,86,40,120,190,25012019025+0,5 -0,8+0,02 -0,03XL 2,3 0,096,47,99,50,250,310,37025031037+0,5 -0,8+0,02 -0,03L 3,6 0,1412,719,125,40,50,751050075100+0,8 -0,8+0,03 -0,03+0,8 -1,3+0,03 -0,05H 4,3 0,1719,125,438,10,7511,5075100150+0,8 -0,8+0,03 -0,03+0,8 -1,3+0,03 -0,05+0,8 -1,3+0,03-0,0550,8 2 200+0
24、,8 -1,3+0,03 -0,05+1,3 -1,3+0,05 -0,05+1,3 1,5+0,05 -0,0676,2 3 300+1,3 -1,5+0,05 -0,06+1,5 -1,5+0,06 -0,06+1,5 -2+0,06 -0,08XH 11,2 0,4450,876,2101,6234200300400+4,8 -4,8+0,19 -0,19+4,8 -4,8+0,19 -0,19XXH 15,7 0,6250,876,2101,61272345200300400500+4,8 -4,8+0,19 -0,19a See Figure 1. ISO 2012 All righ
25、ts reserved 7BS ISO 5296:2012ISO 5296:2012(E)Table 6 Double-sided beltsPitch codeNominal heightamm in.MXL 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 0,870aSee Figures 2 and 3.4 Belt designation4.1 Single-sided belts4.1.1 GeneralSynchronous belts are identifi
26、ed by a standard number. The first digits specify the pitch length which, for the XL and larger pitch belts contained in this International Standard, is the calculated pitch length in inches (pitch length, in millimetres, divided by 25,4) times 10, rounded off to the nearest whole integer. For MXL a
27、nd XXL belts, it is the calculated pitch, in inches (pitch length, in millimetres, divided by 25,4) times 10, rounded off to the nearest tenth. The pitch length is followed by the belt section (pitch) designation. The digits following the belt section designation represent the nominal belt width, in
28、 inches, times 100, rounded off to the nearest three digits.EXAMPLE 1 An L section synchronous belt of pitch length 762 mm (30,000 in) and width 19,1 mm (0,750 in) is designated as follows:300L075EXAMPLE 2 An MXL section synchronous belt with 102 teeth, corresponding to a pitch length of 207,26 mm (
29、8,16 in) and a width of 6,35 mm (0,25 in), is designated as follows:81,6MXL0254.1.2 Alternative method for MXL and XXL beltsThe belt in accordance with this International Standard may be designated by the following:a) the letter B (for belt);b) the number of teeth; c) the pitch code; d) the width de
30、signation, in millimetres, rounded to the nearest tenth.EXAMPLE An MXL section synchronous belt with 102 teeth and a 6,35 mm width is designated as follows:B 102MXL6.48 ISO 2012 All rights reservedBS ISO 5296:2012ISO 5296:2012(E)4.2 Double-sided belts4.2.1 Type A SymmetricalA belt of type A, corresp
31、onding to Figure 2, shall be designated by the following:a) the letter D (for double-sided);b) the type designation;c) the length designation;d) the pitch code, e) the width designation.EXAMPLE A type A synchronous belt of pitch length 42 in (1 066,8 mm), pitch 0,375 in (9,525 mm) and nominal width
32、0,5 in (12,7 mm) is designated as follows:DA 420 L 0504.2.2 Type B StaggeredA belt of type B, corresponding to Figure 3, shall be similar to the type A designation in 4.2.1, except that the letter B replaces the letter A.EXAMPLE A type B synchronous belt of pitch length 98 in (2 489,2 mm), pitch 0,8
33、75 in (22,225 mm) and nominal width 2 in (50,8 mm) is designated as follows:DB 980 XH 2004.3 Designation of pitch length of non-standardized lengthsThe length designation for belts in non-standardized lengths, which are not contained in Tables 3 and 4, shall be established from the pitch length, in
34、millimetres, divided by 2,54. This number shall be rounded as follows:a) for belts with pitch code MXL or XXL: to the first decimal place; for example, for belt MXL with 102 teeth corresponding to a pitch length of 207,26 mm, the length designation is 81,6.An alternative method for belts with pitch
35、code MXL or XXL consists of using the letter B (for belt) followed by the number of teeth, which gives the length designation B 102.b) for belts with pitch codes XL to XXH: to the nearest integral number, where 0,5 is rounded down; for example, for belt L with 130 teeth corresponding to a pitch leng
36、th of 1 238,25 mm, the length designation is 487.5 Pitch length measurement5.1 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).5.1.1 Two pulleys, of equal diameter, as specified i
37、n Table 7, corresponding to the proper pitch code and having standard 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 5 (see Figure 4).
38、 One pulley shall be free to rotate on a fixed-position shaft, while the other shall be free to rotate on a movable shaft to permit the centre distance to change. ISO 2012 All rights reserved 9BS ISO 5296:2012ISO 5296:2012(E)Table 7 Belt pitch length measuring pulleysPitch codeNumber of teethPitch c
39、ircumferenceOutside diameteraRadial run-out FIMbAxial run-out FIMbMinimum clearance Cmmm in mm in mm in mm in mm inMXL 20 40,64 1,612,4280,0130,489 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
40、 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 10,000 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
41、,000 5 0,076 0,003 0,64 0,025aPulleys outside the specified diameter tolerance range may be used, if the resulting belt length measurements are corrected for the actual pulley diameters used.bFIM: full indicator movement5.1.2 Means of applying a total measuring force to the movable pulley.5.1.3 Mean
42、s of measuring the centre distance between the two pulleys, with the necessary degree of accuracy to check the permitted tolerances (tolerances for centre distance measurement correspond to half the permitted length tolerances in accordance with Tables 3 and 4).Key1 belt2 pulleyFigure 4 Clearance be
43、tween measuring pulley and belt10 ISO 2012 All rights reservedBS ISO 5296:2012ISO 5296:2012(E)KeyaTotal measuring force.bCentre distance.Figure 5 Pitch length measuring fixture5.2 Total measuring forceThe total measuring force to be applied for the measurement of belts is given in Table 8.Table 8 To
44、tal measuring forceBelt width desig- nationBelt widthMeasuring force for pitch codeMXL XXL XL L H XH XXHmm in N Ibf N Ibf N Ibf N Ibf N Ibf N Ibf N Ibf0120190250310373,24,86,47,99,50,120,190,250,310,3713202734,561422313,25,07,0 3644538101205007512,719,10,50,751051802440 445 10010015020025,438,150,81
45、1,52245 55 6209801 340140220300 2000 450 2 500 56030040050076,2101,61273452 100 470 3 1004 4507001 0003 9005 6007 1008751 2501 600 ISO 2012 All rights reserved 11BS ISO 5296:2012ISO 5296:2012(E)Bibliography1 ISO 5288, Synchronous belt drives Vocabulary12 ISO 2012 All rights reservedBS ISO 5296:2012T
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