Hydraulic tensioners for standard bolts The choice of tensioner depends on the class and diameter of the bolt, the desired residual tightening force and the space available. The hydraulic tensioner is powered by a hydraulic fluid – oil or water. It exerts a great traction force on the bolt and functions at pressures that can
Hydraulic tension tightening For reliable, uniform and fast industrial tightening Bolted assemblies are without a doubt the most widely used mechanical connecting systems. We know that amongst the different causes of failure (overloading, design flaw, manufacturing defect, etc.), the most frequent one is poor assembly. It is therefore essential to have perfect control over the
Transmission capacity The table gives the required minimum hub diameter (Dhub) for various materials when the SH bushing is completely covered by the hub (fig 1). fig 1 Designation example Bushing with slotted outer components for 20 mm shaft = SHT 20. Width of hub smaller than bushing If the width of the hub is smaller than
Shafts and hubs Roundness The roundness of the shaft should be within tolerance IT7-IT8. For example, the portion of shaft supporting the SH-bushing should be round and straight within this specified tolerances. The same tolerances are also valid for the hub. Surface roughness The surface roughness of the shaft should be max 3,2 Ra. Hollow
Flexible couplings with oil injection mounting SKF oil injection method applied to flexible shaft couplings By combining the principle of SKF oil injection method on flexible shaft couplings, a high torque interference fit for plain, cylindrical shafts is obtained. Since there is no need for machining any keyways, splines or tapered shafts, smaller shaft diameters
Gear couplings Gear couplings are torsionally rigid and are supplied to two designs – completely flexible and flexible/rigid. A completely flexible coupling comprises two hubs with an external gear and two outer sleeves with an internal gear. It’s a universal coupling for all sorts of applications and accommodates all possible misalignments (angular, offset and combined)
Disc couplings KD disc couplings provide reliable transmission of mechanical power from driving to driven machine where low maintenance, non-lubricated couplings are required. KD disc couplings are specifically designed to accommodate general purpose drive system applications such as centrifugal pumps, generators, cooling towers, machine tools, printing, and pulp and paper machines. The coupling transmit torque
Cold Tight systems Long cool-down periods are not needed. The SKF Cold Tight systems offer considerable benefits. The SKF CT reduces downtime by several days each time a steam turbine is opened and closed. Long cool-down periods are not needed. The system also helps in planning the outage more efficiently. Increased safety The Cold Tight
Hydraulic rings and propeller nuts The time saving technology from SKF Traditionally, ship propellers are mounted on a tapered shaft end with a nut and key. The torque is transmitted through friction of the mating surfaces and the key performs a stand-by function if the friction is insufficient. On mounting, the propeller is driven up
Supergrip bolts Cut down on downtime! The same advanced design of OK Couplings has been applied to the coupling bolt. The Supergrip bolts represent a ‘quantum leap’ in improved technology for connecting rotating flange couplings. They are on the job – on land and at sea – delivering performance that supports the claim that they