Simrit_Catalog_2007_Special_Sealing_Products

Bellows | Multiple Convolution BellowsMultiple Convolution BellowsMultiple Convolution BellowsApplicationThere are many application cases for bellows, for example, the functional sealing ofball joints, connection of two tube ends, push rods (e.g. in hydraulic and pneumaticapplications), axle bearings.MaterialMaterial CR NBRFig. 1Multiple Convolution BellowsHardness 42/50 Shore A approx. 45 Shore AOther materials on enquiry (after clarification of the material-job specification and the type).Product descriptionBellows are protective elements comprisinga moving section and two connectionpieces for fastening. They protect axiallymoving rods and parts of machinesagainst soiling, water spray, dust or theeffects of the weather. Depending ontheir design, they can accommodatemovements perpendicular to the axis ora combination of movements (e.g. gearlevers).Bellows are able to follow axial movementswithin their limits L min (compressedlength) and L max (extended length).Special loads (non-axial movements,pressure loads etc.) affect the maximumworking stroke and the flexibility→ Technical Manual.Product advantagesDepending on the application, bellowsand connecting areas can have verydifferent geometrical shapes and dimensions.More than 500 different bellowsgeometries are available to the userquickly and cost-effectively.Operating conditionsMaterial CR NBRTemperature –40 … +100 °C –30 … +100 °CDynamic loading very good sufficientMineral oil and greaseresistancesufficientThe values listed in the table are recommended values.→ Technical Manual.Fitting & installationThe moving section of the bellows mustnot come into contact with any sharpedges. It is imperative that continuouschaffing against moving parts of themachine is avoided.Bellows are not able to absorb majorexcess pressure or vacuum, as otherwiseexcessive deformation would occur.To prevent a pressure build-up insidebellows on axial movements, a sufficientventilation must be provided.Torsional loading of the bellows shouldbe avoided.For further information on installation:→ Technical Manual.Fig. 2Manufactured lengthL max.L min.goodConnection Ø1Connection Ø2Drawing with dimensions multipleconvolution bellows24© Freudenberg Simrit GmbH & Co. KG | Special Sealing Products Catalog 2007