1 TORSIONAL COUPLINGS INTRODUCTION System Torsional Vibratory Load 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 largest size, the LF400, can transmit up to 5,000 Nm of torque. These are available in a range of shore hardness. The LF is one of the most versatile couplings available, it can be adapted to many configurations such as shaft-to-shaft, engine flywheel mounts, or floating shaft. It not only provides torsional protection but also absorbs shock loads and can tolerate misalignment. For direct-mounted, diesel-driven hydraulic pumps, the LF coupling in Hytrel® and a LK coupling are available. These are very stiff couplings designed to shift critical speeds well above the operating range. When the inertia of the driven (hydraulic pump or pumps) is small compared to that of the driver (the diesel engine), a stiff coupling such as the LF Hytrel® or LK is required. Hydraulic pump drives are a fast-growing segment of the market, particularly in smaller diesel engine drives. Applications include crawler tractors, manlifts, compactors, skid steer loaders, excavators and forklift trucks. Both the LF Hytrel® and the LK have many thousands of hours of successful service in a wide variety of applications around the world. Torsional couplings are designed primarily to fit standard installations such as those specified by SAE. jbj Techniques has design and application engineers with many years of experience to custom design a torsional coupling to fit special applications. We can solve torsional vibration problems. Also if necessary, our engineers can analyze coupling failures. For assistance please contact: jbj Techniques Limited technical office, telephone: 01737 767493 or email: info@jbj.co.uk LF Torsional Coupling System Overview The LF Torsional coupling system consists of six basic models or configurations. Each model is designed to satisfy user requirements in a particular area of application and is available in a wide range of torque sizes; 10 - 5000 Nm. Flexible elements of various materials and durometer hardness may be substituted for each other in each size without complicated and uneconomical changes in coupling hardware or design. No other coupling design has achieved this versatility and economy from common components. The LF Torsional coupling system has readily available solutions for user requirements of misalignment, installation environmental conditions; corrosives, temperature, etc., torsional vibration dampening, noise reduction, reliability, reaction force reduction and more. LF Torsional couplings recognize the three essential requirements that a coupling must fulfill: 1) Reliable transmission of power. 2) Quick and economical installation. 3) Protection of the coupled equipment from dangerous torsional vibrations, reaction forces and misalignment. Application engineering and experienced customer service support this line of LF Torsional couplings. Our application engineers routinely administer computer analysis of potential torsional problems in drive systems. The considerable advantages of the LF Torsional coupling, as well as the service offered by our application engineers has led to wide use of this coupling. The L-Loc spline-clamping hub described in more detail in this catalog virtually eliminates spline shaft wear and “fretting”. The LF Torsional coupling is one of the leading couplings in the field of hydrostatic drives in rugged off-road construction equipment. #DriveLineHarmony www.jbj.co.uk/torsional-couplings.html
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