Tensioning systems

TENSIONING SYSTEMS - TABLE OF CONTENTS Function, Principles, Handling 110 Optical Control Displays 111 The Correct Choice of Chain Tensioner 114 Selection Table for Tensioning Systems 115 -116 Graphical Depiction of Installation Examples 117 Mounting Brackets for Spann-Box® Systems 118 -119 Chain Tensioners for Roller Chains as per DIN 8187 121 -133 Mini-Tensioner, Spann-Boy®TS, Spann-Box® size 0, Spann-Box® size 30, Spann-Box® size 1, Automatic Belt Tensioners 134 -139 Spann-Boy®TS, Spann-Box® size 0, Spann-Box® size 1, Spann-Box® size 1 Type SR-L, Spann-Box® size 1 Type SR-S_

TENSIONING SYSTEMS For chains and belts Wide range – extensive inventory Thanks to our variety of different tensioning systems, we are able to quickly and accurately meet practically any requirements. If you require an individual solution, our freeof-charge, non-binding consulting services are sure to help. One more thing: We supply all tensioning systems with a declaration of installation in line with the Machinery Directive EC 2006/42/EC. Smooth chain movement Reduction in wear on chain links and drive sprockets Reduction in working noise Automatic adjustment Compensation for chain and belt...

FUNCTION, PRINCIPLES, HANDLING Our tensioning systems are free-running and resilient. As a result, they do not function as rigid deflectors when stressed. This avoids excessive contact pressure. Our systems aim to keep the overall force on the slack strand – resulting from the weight of the chain and the centrifugal force – under control. The ideal installation position is right behind the drive sprocket in order to keep the length of the slack strand that needs to be tensioned as short as possible. Use at extreme temperatures If you choose the correct material, you can also use our tensioning...

OPTICAL CONTROL DISPLAYS Murtfeldt Spann-Box® systems generally have a coloured scale. This enables you to determine the tensioning state of the chain at a glance. The display is as easy to understand as possible: Green The chain tensioner is working in the “green range”. The tensioning force is providing an ideal, smooth running movement. Yellow The tensioning force is not ideal but is still sufficient. F UNC T ION, PRINCIPLE S, HANDLING | OP T IC AL CONT ROL DISPL AYS Red The chain tensioner needs to be adjusted. The tensioning force on the chain is too low for a smooth and reliable running...

OVERVIEW OF Spann-Box® Types Chain tensioners Spann-Box® size 0 page 124 Spann-Boy® TS with arc segment profile – page 122 Spann-Box® size 30 page 125 Spann-Box® size 1 with arc segment profile – page 126 Spann-Box® size 1 with return profile – page 128 Spann-Box® size 1 with sprocket Type K-L – page 129 Spann-Box® size 2 with arc segment profile– page 130 Spann-Box® size 2 with return profile – page 132 Spann-Boy® TS with sprocket – page 123 Spann-Box® size 1 with semi-circular profile – page 127 Spann-Box® size 1 with sprocket Type K-S – page 129 Spann-Box® size 2 with semi-circular profile...

Belt tensioners Spann-Box® size 1 belt tensioner with tensioning roller at top – page 137 Spann-Boy® TS tensioning roller – page 135 Spann-Box® size 1 with tensioning roller type SR-L – page 138 Spann-Box® size 1 with tensioning roller type SR-S – page 139 Spann-Box® size 0 page 136 SIGNS AND SYMBOLS Features and properties of tensioning systems Plastic housing Two pre-tensioned compression springs, tension distance specification in mm Steel housing (also stainless steel) Three pre-tensioned compression springs, tension distance specification in mm Track profile for all large chains Further adjustment...

THE CORRECT CHOICE OF CHAIN TENSIONER Smooth running is a decisive factor for the long lifetime of a chain. We therefore recommend the use of a chain tensioner with a slide profile. Advantage: Protects the chain links and provides a quieter, safer movement. IMPORTANT CRITERIA WHEN SELECTING THE BEST CHAIN TENSIONER FOR YOUR NEEDS Axis-centre distances of sprockets We are happy to provide detailed advice if you inform us of the required criteria. Our Web site at www.murtfeldt.com contains a design questionnaire that you can use to enter all required data. Chain design Constant/changing running...

Selection table for chain tensioners 1) is possible to use several types of SPANN-BOX ® It alongside each other with duplex or triplex chains. 2) Slide profile or return pulley with U-profile. Simplex chain Unspecified chains with a width of up to 15 mm 2) 06B SPANNBOY® TS with sprocket Explanation of symbols Profiles symbols for selection tables SPANNBOY® TS with arc segment profile Arc segment profile · lide profile shape with optimum S mechanical properties · Simultaneous contact with several rollers · Optimum chain protection Return profile · 180° change of direction · he 180° change of direction...

Duplex chain SPANNBOY® TS with arc segment profile SPANNBOY® TS with sprocket Triplex chain Block profile · uitable for particularly heavy chains and high mass forces S · Slide profile and tension core made from a single piece · No screw connections · Excellent stability · 00 mm slide profile ensures support for many rollers with 3 chains with large chain pitches Semi-circular profile · For 90° deflection · Contact with only very few chain rollers · Recommended where space is at a premium Roller/sprocket · or small changes of direction F · For high chain speeds ( > 1 m/s)

Optimum, extremely efficient chain support/tensioning 180° return profile. This arrangement allows a particularly long chain length to be accommodated. Omega tensioning station – ready-to-install system If the running direction changes, we recommend using two Spann-Box® units near to the drive. Return/tensioning station Popular but non-optimal arrangement, tension distance not used efficiently Selection table for chain tensioners / GR APHIC AL DEPIC T ION OF INSTALL AT ION E X A MPLE S GRAPHICAL DEPICTION OF INSTALLATION EXAMPLES