Advantages compared to conventional systems ® SIT-LOCK Keyless Locking Elements 1 www.jbj.co.uk/couplings.html #DriveLineHarmony ® Advantages of SIT-LOCK on the shaft-hub connection compared with traditional systems Easy assembly and disassembly Both actions take place by locking and unlocking the clamping screws with common tools. The use of a torque wrench is only necessary when a more precise torque is required. Superior holding power The action of the clamping cones creates shaft clamping torque superior to a normal keyed hub. Overload protection ® When the pre-set torque is exceeded SIT-LOCK will slip, preventing the connected elements from being broken. ® Note: SIT-LOCK units are not friction couplings so, excessive slip will cause damage. Easy adjustment ® Combining the SIT-LOCK design of smooth cone action with superior holding power, the hub can be clamped at any position along a shaft, eliminating the need for lock washers, spacers, stop rings, etc. Precision location ® ® With the SIT-LOCK smooth cone action, the SIT-LOCK is ideal for clamping cams, timing devices, and indexing mechanisms accurately and precisely. Temperature -20°C to 150°C. ® Unlimited use possibilities SIT-LOCK units are suitable to connect any type of hub (flywheels, chainwheels, gears, levers, pulleys, eccentrics, coupling, etc). Various solutions in stock ® Available in stock in 10 different types, SIT-LOCK units can be utilized in a varied range of industrial applications. Ordering Code CAL 1 F25 /50 ® CAL: SIT-LOCK keyless locking devices Type Shaft diameter (mm) Outside diameter (hub bore) (mm) NOTE: For external locking devices the d diameter is indicated, not the d diameter w Performances Given values of transmissible torque, axial force, and pressure between shaft and hub are valid for a lubricated installation (friction coefficient μ=0,12). Both hub and shaft, as well as locking unit’s contact surfaces and screws, should be lubricated. Locking unit and screws are supplied already oiled. Always consider tolerances and roughness values per single locking unit. To avoid decrease of locking unit performances, do not use molybdenum disulfide lubricant or other substances that drastically reduce coefficient of friction. Design procedure ® For a correct functioning of SIT-LOCK , the transmissible torque M (stated in this catalogue) must always exceed the maximum torque in operation. So, in T ® selecting the SIT-LOCK dimensions, you must consider the start up torque could be even 4 times larger than the nominal one. The transmissible axial forces (F ) given in the tables are valid for cases where there is no torque. If it is necessary to transmit both a torque and an axial force ax (ex. helical gear), the following formula must be used: 2 2 M ≥ M + Fax•d (Nm) T a 2000 where: M = maximum torque to be transmitted (Nm) a F = axial force in operation (N) ax d = shaft diameter (mm) ( (
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