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Standard timing pulleys

Standard timing pulleys
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Standard timing pulleys

Product catalog summary
Overview: This document is a comprehensive technical catalog from SIT SpA, detailing their range of timing pulleys. It includes specifications, identification codes, tolerances, manufacturing standards, and protective treatments.
Specifications: The catalog covers various types of timing pulleys, including MXL, XL, L, H, XH, XXH, Super Torque, and TOP DRIVE® HTD, with pitches from 2.032 mm to 31.750 mm. Pulley identification is based on a three-group code indicating the number of teeth, pitch, and belt width. Specific models are identified by codes such as PD 18 XXH 300, with detailed parameters like teeth count and diameter ranges.
Manufacturing Standards: Pulleys are manufactured according to DIN ISO 5294 and DIN 7721 standards. Bore tolerances are typically ISO 7, with H7 tolerance for unspecified cases. Lateral oscillation tolerance is 0.0254 mm per 25.4 mm radius.
Protective Treatment and Balancing: Pulleys are black phosphated for protection. Balancing is done according to UNI 4218, ISO 1940, and VDI 2060 standards, with taper bushings balanced to G 16 degree.
Special and Standard Pulleys: Special pulleys can be custom-made from cast iron or steel, with aluminum as an option for weight reduction, though it may reduce lifespan. Standard pulleys are stocked in various diameters and widths, designed for minimal friction and correct meshing with belt teeth.
Dimensions and Parameters: Detailed dimensions for each pulley model are provided, including outer diameter (R), hub diameter (YH), and other critical measurements (We, U, S, Z). These dimensions ensure compatibility with specific mechanical systems.
Material and Construction: All pulleys are constructed from cast iron, known for its durability and strength. The document specifies whether the pulleys come with flanges, which are essential for certain applications.
Applications: These timing pulleys are designed for use with SER-SIT® conical bushes, indicating their application in systems requiring precise timing and synchronization.
Key Data from Tables: The tables provide a comprehensive list of pulley models with their respective specifications, including the number of teeth, diameter ranges, and compatibility with specific bushings. This information is critical for selecting the appropriate pulley for a given application.
Contact Information: The document includes contact details for SIT SpA, including their address in Milan, Italy, phone numbers, and email for export inquiries.
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Catalog excerpts

Standard timing pulleys-1

SIT SpA Via Watt, 15 - 20143 Milan - ITALY T. +39 02891441 F. +39 0289181327 e-mail: [email protected] - TIMING PULLEYS (008.05) 1 2,032 5,080 9,525 12,700 22,225 31,750 0,080 0,200 0,375 0,500 0,875 1,250 (2/25) (1/5) (3/8) (1/2) (7/8) (1/ 1/2) MXL XL L H XH XXH Super Torque: S 4,5 M S 8 M S 14 M TOP DRIVE® HTD: 3 M 5 M 8 M 14 M 3 4,5 5 8 14 – – – – – – – – – – T2,5 T5 T10 T20 AT5 AT10 2,5 5 10 20 – – – – – – – – TIMING PULLEYS POULIES DENTÉES ZAHNSCHEIBEN POLEAS DENTADAS GENERALITY This catalogue is a synthesis of the whole SIT range of timing pulleys. GÉNÉRALITÉ Ce catalogue est une synthèse de l’entière gamme SIT des poulies dentées. ALLGEMEINES In diesem Katalog ist die ganze Reihe der SIT Zahnscheiben beschrieben. GENERALIDAD Este catálogo es una sintesis de la gama completa de las poleas dentadas SIT. Timing pulleys pitches Les pas des poulies dentées Zahnscheiben teilungen Paso de las poleas dentadas Pulley indentification SIT Timing pulleys are indicated by a conventional code consisting of 3 groups. The first group shows number of teeth. The second group shows the pitch (stated at the beginning of each table). The third group shows the belt width for which the pulley has to be used: • for XL, L, H, XH and XXH pulleys the belt width is in hundred of an inch (100 =1 inch) • for Super Torque, TOP DRIVE® HTD, T2,5, T5 and T10 pulleys the belt width is in mm. In case of timing pulley for assembly with SER-SIT® conical bush, the previous conventional code must be preceded by the letter “B”. Example: Designation des poulies Les poulies dentées de série sont désignées par un code conventionnel, formé de 3 groupes. Le premier indique le nombre de dents. Le deuxième indique le pas (en tête de chaque tableau). La troisième groupe indique la largeur de la courroie pour laquelle la poulie doit être utilisée: • pour les poulies XL, L, H, XH et XXH la largeur de la courroie est indiquée en pouce (100 = 1 pouce); • pour les poulies Super Torque, TOP DRIVE® HTD T2,5, T5, T10, la largeur de la courroie est indiquée en mm. En cas de poulies dentées pour montage avec moyen amovible SER SIT®, le code conventionnel précédent doit être précédu par la lettre “B”. Example: Kennzeichen Das konventionelle Kennzeichen für SIT Zahnscheiben soll wie folgt interpretiert werden. Die erste Zahlengruppe zeigt die Zähneanzahl. Die zweite Buchstaben/Zahlengruppe zeigt die Teilung (am Kopt von jeden Tabelle gezeigt). Die dritte Zahlengruppe zeigt die Breite des Riemens wofür die scheiben geeignet sind, wie folgt: • für XL, L, H, XH und XXH Scheiben die Breite ist in Hunderstel Zoll gezeigt (100=1 Zoll); • für Super Torque, TOP DRIVE® HTD, T2,5, T5, T10 Scheiben, die Breite ist in mm gezeigt. Falls die Scheiben mit SER SIT® Spannbuchsen ansgerüstet sind, das Kennzeichen wird ein “B” am Anfang haben. Beispiel: Identificacion de las poleas Las poleas dentadas SIT están referenciadas mediante un código convencional formado por tres grupos. El primer grupo indica el número de dientes. El segundo indica el paso (tal como se precisa en la cabecera de cada tabla). El tercer grupo indica el ancho de la correa para la cual la polea será utilizada: • para las poleas XL, L, H, XH, XXH el ancho de la correa se indica en centésimas de pulgada (100=1 pulgada); • para la polea Super Torque, TOP DRIVE® HTD, T2,5, T5 T10 el ancho de la correa se indica en milímetros. En caso de poleas dentadas con buje conico SER SIT®, el codigo convencional anteriormente descrito debe ser precedido con la letra “B”. Ejemplo: type type Typ tipos pitch pas Teilung paso mm inches B 28 L 050 pulley n. pitch belt width for teeth (1/2”) Ser-Sit® bush B 28 L 050 poulie dents pas largeur pour moyeu de la amovible courroie Ser-Sit® (1/2”) B 28 L 050 Spann- Zähne Teilung riemenbuchse anzahl breite Ser-Sit® (1/2” Zoll) B 28 L 050 Polea para número paso ancho de buje cónico de la correa Ser-Sit® dientes (1/2”)

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Standard timing pulleys-2

2 SIT SpA Via Watt, 15 - 20143 Milan - ITALY T. +39 02891441 F. +39 0289181327 e-mail: [email protected] - TIMING PULLEYS (008.05) up to 254 over 254 jusq’à 254 au-desseus 254 bis 254 über 254 hasta 254 otras 254 0,1270 0,0127 each 25,4 mm diameter 0,1270 0,0127 par fraction de 25,4 mm 0,1270 0,01270 für je 25,4 mm Durchmesser 0,1270 0,01270 por cada 25,4 mm Pulley bore tolerances On request a tolerance ISO 7 is normally suggested, normally pulleys are bored with H7 tolerance, of not otherwise specified. Tolérance d’alésage des poulies La valeur de tolérance conseillée correspond à ISO qualité...

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Standard timing pulleys-3

SIT SpA Via Watt, 15 - 20143 Milan - ITALY T. +39 02891441 F. +39 0289181327 e-mail: [email protected] - TIMING PULLEYS (008.05) 3 Protective treatment Pulleys are black phosphated. Balancing UNI 4218 – ISO 1940 – VDI 2060 The pulleys for taper bushings (PBD – STB – HDB) are statistically balanced within G 16 degree. The pulleys with full hub are not balanced, as they do not have a finished bore. Protection traitement Les poulies sont phosphatées noir. Equilibrage UNI 4218 – ISO 1940 – VDI 2060 Dégré d’equilibrage selon G16 pour les poulies por moyeu amovible (PBD – STB – HDB). Les poulies prévues...

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Standard timing pulleys-9

SIT SpA Via Watt, 15 - 20143 Milan - ITALY T. +39 02891441 F. +39 0289181327 e-mail: [email protected] - TIMING PULLEYS (008.05) 9 THERMOSETTING RESIN TIMING PULLEYS, TYPE «PP» POULIES DENTEES EN MATERIE PLASTIQUE THERMODURCISSABLE, TYPE «PP» KUNSTHARZ-ZAHNSCHEIBEN TYP «PP» POLEAS DENTADAS EN RESINA TERMOENDURENTE,TIPO «PP» Characteristics • The toothed side is drop-moulded from thermosetting resins of high dimensional stability and reinforced with high resistance textile fibres. • The hub is metallic, to give grater strenght and better resistance for the keyway and thread. As regards the «XL»...

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