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1、INTERNATIONAL STANDARD IS0 5296-2 First edition N b) length and width dimensions; c) tolerances on these dimensions; d) length measuring specifications. This part of IS0 5296 applies to synchronous belt drives having a pitch equal to 2,032 mm or 3,175 mm designated by the symbols MXL and XXL. As far
2、 as the dimensions are concerned, belts with pitch code MXL are interchangeable with those of pitch code MXL in IS0 5296-l. 2 Normative reference The following standard contains provisions which, through reference in this text, constitute provisions of this part of IS0 5296. At the time of publicati
3、on, the edition indicated was valid. All standards are subject to revision, and parties to agreements based on this part of IS0 5296 are encouraged to investigate the possibility of applying the most recent edition of the standard indicated below. Members of IEC and IS0 main- tain registers of curre
4、ntly valid International Standards. IS0 5296-l : 1989, Synchronous belt drives - Belts - Part 1: Pitch codes MXL, XL, L, H, XH and XXH - Metric and inch dimensions 3 Pitch codes The pitch code and corresponding belt pitch are given in table 1. Table 1 - Pitch codes I I Belt pitch*) Pitch code mm I I
5、 MXL I 2,032 I I *I Carried to the third decimal place because belt pitch is a defined value. I 4 Dimensions and tolerances 4.1 Tooth dimensions The nominal belt tooth dimensions (see figure 1) are given in table 2. i I 1 5 rr 5 l . Figure 1 - Tooth profile 1) Synchronous belt drives have been known
6、 by various titles in the past: for example, timing belt drives, positive belt drives, gear belt drives. 1 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/27/2007 04:44:35 MDTNo reproduc
7、tion or networking permitted without license from IHS -,-,- IS0 5296-Z : 1969 (El Table 2 - Nominal tooth dimensions 5 Belt designation Pitch code dezees S MXL 40 1,14 XXL 50 1,73 Dimensions in millimetres ht r ra 0,51 0,13 0,13 0,76 02 0,3 4.2 Lengths The belt pitch lengths and tolerances are given
8、 in table 3. Table 3 - Pitch lengths and tolerances Dimensions in millimetres Number of teeth MXL XXL 45 - 50 - 55 - 60 - 40 70 - 75 48 80 - - 56 90 100 4 110 - 72 125 80 Pitch length 91,44 101,6 111.76 121,92 127 142,24 152,4 162,s 177,8 182,88 203,2 223,52 228,6 254 Tolerance f 0,41 - 279,4 140 88
9、 284.48 - 96 304,8 155 - 314,96 f 0,46 - 104 330,2 175 112 355,6 120 381 200 128 4W4 225 144 467,2 f 0.51 250 160 508 - 176 558 zk 0,61 4.3 Widths and heights The belt widths and tolerances, and the nominal heights, are given in table 4. Table 4 - Widths and heights Dimensions in millimetres Pitch c
10、ode Nominal heights (See figure 1) Widths Tolerance for belt ha Dimension Designation width MXL 1,14 3,2 32 4.8 4.8 +0,5 XXL 132 6,4 64 -0,8 The belt designation consists of the letter B (for belt), the number of teeth, the pitch code and the width designation in millimetres. EXAMPLE A synchronous b
11、elt of 100 teeth, pitch code MXL (2,032 mm pitch) and belt width 4,8 mm is designated: B 100 MXL 4.8 NOTE - The designation of this belt according to IS0 5296-l is 80.0 MXL 019. 6 Pitch length measurement 6.1 Measurement The Ditch lenath shall be determined in accordance with IS0 !&Z-l : 1989, claus
12、e 5. 6.2 Measuring pulleys The dimensions and tolerances of the pulleys for use in measuring belt lengths are given in table 5. The appropriate minimum clearance, C, is shown in figure 2 and table 5. Figure 2 - Clearance between measuring pulley and belt 2 Copyright International Organization for St
13、andardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/27/2007 04:44:35 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 5296-2 : 1989 (El Table 5 - Belt pitch length measuring pulleys Dimensions in millimet
14、res Outside Minimum Pitch code Number Pitch diameter Radial run-out Axial run-out clearance of teeth circumference f 0,013 TIR” TIRI Cm MXL 20 wu 12,428 0,25 15,662 0,013 0,025 XXL 16 50.8 0,3 1) Total indicator readinq (maximum) 6.3 Total measuring force The total forces to be applied for measuring
15、 belt pitch lengths are given in table 6. Table 6 - Total measuring force Belt width designation 3.2 4.8 6.4 Belt width mm 3.2 4.8 6,4 Force for pitch code MXL XXL N 13 14 20 22 27 31 3 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Tech
16、nical Standards 1/9972545001 Not for Resale, 04/27/2007 04:44:35 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 5246-2 : 1989 (El Annex A (informative) Bibliography IS0 6288 : 1982, Synchronous belt drives - Vocabulary. Copyright International Organization for Standard
17、ization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/27/2007 04:44:35 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 6296-2 : 1989 (E) UDC 621.66.052.44 Descriptors : synchronous transmission, belt drives, bel
18、ts, power transmission belts, synchronous belts, dimensions, dimensional measurements, designation. Price based on 4 pages Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/27/2007 04:44:35 MDTNo reproduction or networking permitted without license from IHS -,-,-