Torsional couplings
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TORSIONAL COUPLINGS Quality Products for Mechanical & Fluid Power

an excellence in engineering www.jbj.co.uk/torsionalcouplings.html TORSIONAL COUPLINGS Torsional Couplings solve torsional vibration problems typical of those found in diesel engine applications. The LF family is a rubber-in-compression coupling designed for a wide range of applications such as generators, pumps, compressors, front power take-off, etc. The largest size, the LF400, can transmit up to 5,000 Nm of torque. These are available in a range of shore hardness. Torsional couplings are designed primarily to fit standard installations such as those specified by SAE. jbj Techniques has...

CONTENTS quality products for mechanical & fluid power The details contained within this catalogue are reproduced in accordance with the latest information at going to press LF weights & mass moment of inertia LF torsional flywheel couplings Model 6 & 6B floating shaft couplings LF torsional model 6 & 6B dimensions LF torsional model 6 & 6B LF torsional assembly instructions Pump mounting plates Pump mounting housings LM technical data - natural rubber LM technical data - silicone (50 shore A) LM torsional coupling dimensions (standard types) LM torsional coupling dimensions (special types for...

TORSIONAL COUPLINGS Torsional Couplings Lovejoy Torsional Couplings solve torsional vibration problems typical of those found in diesel engine applications. The torsional coupling dampens torsional vibrations and tunes the system to have critical speeds outside the operating range. Our application engineers can analyze the application with our computer programme and determine the exact coupling needed for almost any application. The LF family is a rubber-in-compression coupling designed for a wide range of applications such as generators, pumps, compressors, front power take-off, etc. The...

TORSIONAL COUPLINGS Characteristics and benefits of LF Torsional Couplings The basic component of the LF Torsional coupling is the unique and highly versatile elastomeric element. This element can be easily mounted in a number of different ways according to the application, and without special design changes or complex hardware modifications. The element, which is available in different materials for optimium performance, is connected to a cylindrical hub with radial screws and then to a flanged hub by axial screws. This unique coupling design is remarkably simple, highly effective, and gives the...

TORSIONAL COUPLINGS LF TORSIONAL COUPLING SYSTEM LF Torsional Coupling System These are the six standard LF Torsional coupling models. The simple, unique design of the LF Torsional coupling permits this wide range of models, from common components, to meet each application requirement. From engine flywheel housing or the long corrosive span of a cooling tower, we have the optimum LF Torsional coupling model available for your application. Model 0 and 0/S The heart of the LF Torsional coupling is the flexible element. This model is easily mounted to the customer’s application designs or...

TORSIONAL COUPLINGS LF TORSIONAL COUPLING SYSTEM Model 4 Similar to Model 3/S, this model consists of a cylindrical hub for shaft mounting and a high performance Hytrel® element which is pilot-mounted to a cast alloy SAE flywheel adaptor plate machined to SAE J620 specifications. Model 4 features a thin coupling profile for tight engine housing/pump application requirements. This is a reliable solution for problems of torsional resonance and performance in hot, oily environments. 6 Floating shafts are available to customer specified assembly length, with special corrosion and heat resistant...

TORSIONAL COUPLINGS LF TORSIONAL FLEXIBLE ELEMENTS LF Torsional Flexible Elements The focus of any coupling is the flexible elements; the working component . This is the part that must effectively absorb the shock loads, misalignment forces, torsional vibrations and the abuse of environmental conditions. It must be reliable, economical and not harmful to the connected equipment. It is virtually impossible for one single element material or coupling configuration to sat isfy all these user requirements. That is why there are different materials used for flexible elements. Optimum and reliable...

TORSIONAL COUPLINGS L-LOC SPLINE SHAFT CLAMPING FEATURE L-Loc Spline Shaft Clamping Feature For years spline shaft profile distortion and fretting were a major problem for hydraulic pump manufacturers. Now Lovejoy offers a simple solution: L-Loc. It is well known that normal manufacturing tolerances between the spline shaft and its mating spline coupling hub create unavoidable play. This play permits minor movements between the components. Compounding this tolerance related movement is misalignment and the hammering forces during power transmission. Eventually spline profile distortion occurs...

TORSIONAL COUPLINGS COUPLING SELECTION Torsional Coupling Selection for Internal Combustion Engine Applications When correctly sized and selected the torsional coupling will effectively dampen vibration and tune critical frequencies out of the operating range of systems driven by diesel, petrol or natural gas reciprocating engines. But to make sure the coupling will do it’s job as intended, the selection should be verified with a torsional analysis of the system. Misapplication of the coupling in an engine application frquently leads to coupling failure or system damage. Therefore contact the...

* HTR = High Temperature Rubber ** Angular and parallel misalignment values are dependent on speed, and for rubber elements, they should be adjusted according to figure two on page 10. Hytrel® elements are only for applications where the driven component is located to the driver for essentially perfect alignment i.e. hydraulic pump flange-mounted to engine flywheel housing. *** The “S-Style” design is not constrained axially and allows hubs to move apart without creating axial force on the connected equipment. Special length S-Style fastener sleeves can further increase the allowable end...