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ISO 19347-2015 pdf free download
ISO 19347-2015 pdf free download.Synchronous belt drives Imperial pitch trapezoidal profile system
Belts and pulleys
Transmissions synchrones par courroies — Système de profil trapezoidal pour pus imperial — Courroies et poulies.
5 Belt designation
5.1 SIngle-sided belts
Synchronous belts are identified by a standard number. The first digits specify the pitch length which for the XL and larger pitch belts contained 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 the 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 in) width is designated:
An 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:
5.1.2 Alternate method for MXL and XXI belts
The belt in accordance with this International Standard may be designated by the following:
a) letter B (for belt);
b) number of teeth;
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:
5.2 Double-sided belts
5.2.1 Type A — symmetrical
A belt of Type A, corresponding to Fi.gurel, shall be designated by the following:
a) letter D (for double-sided);
b) type designation;
c) length designation;
e) 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 0,5 in (12,7 mm) is designated:
5.2.2 Type B — staggered
The bek designation for Type 13 belts corresponding Figure l c) is similar to 42J. except that a B replaces the A.
EXAMPLE A Type B synchronous belt of pitch length 98 in (2 489,2 mm), pitch 0,875 In (22,225 mm) and nominal width 2 in (50,8 mm) is designated:
DB 980 XH 200
5.3 Designation of pitch length of non-standardized lengths
The 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 millimetres 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 (for belt) followed by the number of teeth, which gives the length designation B 102.
b) for belts with profile XL to XXII 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.ISO 19347-2015 pdf free download.
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