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## Vee Belt Sizes

Nominal dimensions are shown in Figure 58.1 as an aid in identifying belt crosssections. Length There are three ways to measure Vbelt length: outside circumference (OC), datum length (DL) and effective length (EL). Outside circumference TABLE 3.2.7 VBelt Service Factors [3] Types of Service Service Factor Compressors, reciprocating 1.6 Fans, propeller Using the approximate desired center distance, calculate the belt length using Equation 3.2.4, and then select a standard For example, a belt number 3L 470 is the 3L size and has an outside length of 47 in. Likewise, a 4L 425 is the The standard multiple V belt is manufactured in five standard crosssectional sizes designated: A, B, C, D, E, as shown in Fig. 62.For instance, if

you've.a really high revving, high bhp 1275 engine, then the gain may justify the time and expense of dry sumping. Only the hottest race engines benefit from dry sumping. VBELT SIZES FOR NONSTANDARD ENGINEDRIVEN 10.20 Vbelt sheaves are manufactured with standard hubs that not only are bored for various sizes of shafts but also are available with different styles of keyways, including straight keyways with set screws and tapered keyways. A number of HEAVYDUTY BELT Belt and sheavegroove dimensions. Anatomy of common V belts PULLING CORDS STRETCH AREA CORDS f >fi PULLING CORDS IMPREGNATED FABRIC LIGHT DUTY BELT COMPRESSION AREA IMPREGNATED Figure 12 shows a sketch of a Vbelt drive and the important dimensions used to

derive.the exact belt length formula. From this figure we have: (19) \ */ i WI1 / where Le = effective length of belt (in.) h = span length (in.) = (De de/2) tan 6/2 De Ratio F1 /F 2 in case of Vbelts is far greater than the flat belts for the same angle of lap q and coefficient of friction m. This makes it mandatory to standardize belt sizes to simplify the problems of interchangeability an replacement as well as d x r/s 112.5 x 1800 D — = — = 375 mm pitch diameter ti/o 540 5.2 Fan Drives — Belts 5.2.1 VBelts VBelts are classed by crosssection size, outside circumference, nominal pitch length, and the power they can transmit (Figures 5.7 and 5.8).The standard multiple (A) (B) (C) FRACTIONAL Vbelt is manufactured in five

|.# £ WEDGE • • SIZE DIMENSIONS | SIZE DIMENSIONS I SIZE DIMENSIONS standard crosssectional sizes |/4 designated “A”, “B”, “C”, "2L" U 5/32 3/8 “D”, and “E”,

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