That’s because the type of length for nominal length (the length to give when specifying a belt) is different for the different types of belts (for example, it is “inner length Li” for classic v-belts – also the only error in the v-belt conversion table linked above). A very important tool to work with belt specs is a v-belt conversion table. The DIN and ISO standards cited above are used in Europe in the US, the standard RMA/MPTA (and in the UK, BS 3790) specifies minimally different but overall compatible profiles with other profile names.
See also the English Wikipedia on mechanical belts and the German Wikipedia on v-belts though both of them lack extensive information on belt specs yet. For an overview about DIN and ISO standards relevant for v-belts and similar devices, see HUG-Technik on important standards for belts.
Used for example in several modern vehicles.įor a short description of the different types, see HUG-Technik on Keilriemen for a more detailed introduction, read on v-belts. ribbed v-belts (German “Rippenriemen”, “Mehrrippenriemen”): in cross-section similar to flat belts, just that the bottom looks like multiple little v-belts running in parallel.round belts (German “Rundriemen): mostly used for conveying and driving tasks in mechanical engineering.There seems to be no widely accepted standardization in this area, they are named by the measures of their rectangular cross-section. flat belts (German “Flachriemen”): used in different applications such as tangential belts, folding and conveyor belts and machine belts.wide-profile v-belts (German “Breitkeilriemen”, “Variatorriemen”): standardized in DIN 7719 / ISO 1604.
high-performance narrow-profile v-belts, open shoulder, toothed (German: “Hochleistungs-Schmalkeilriemen – flankenoffen, formgezahnt”): standardized in Europe in DIN 7753 Part 1 using XP… profile names in different sizes (XPZ, XPA, XPB, XPC).Probably, “SP” stands for German “Schmalprofil” (“narrow profile”).
- narrow-profile v-belts (German “Schmalkeilriemen”): standardized in DIN 7753 Part 1 / ISO 4184 using SP profile names in different sizes (SPZ, SPA, SPB, SPC).
- conventional or classic v-belts (German “klassische Keilriemen”): standardized in DIN 2215 / ISO 4184 using one-letter profile names in different sizes (Z, A, B, C, D, E), in many cases the profile is also named by its width in millimeters (10, 13, 17, 22, 32, 40).
- Basically, there are these groups of v-belt and other belt profiles in use in Europe today: