Caterpillar Engine Installation Guide
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. Marine Engine Application and Installation Guide. Driveline Components o General Information o Screw Propeller Drives o Jet Drives o Torsional Vibration o Driveline Couplings Information contained in this publication may be considered ©2004 Caterpillar confidential. Discretion is recommended when distributing. General Information Drivelines can be subdivided into two groups, depending on how the thrust forces driving the hull are created. Screw propeller drivelines have a propeller converting engine power to thrust outside the hull.
The thrust forces are generated on the propeller and transmitted to the hull through the propeller shafting and marine transmission. The following nomograms will serve as a guide for shaft sizes and bearing spacing for commonly used shaft materials consistent with good marine practice. LEGM4728-00 Page 3 of 17. Location of first shaft bearing aft of the marine transmission The location of the first line shaft bearing from the marine transmission flange is extremely important.
To avoid inducing unwanted forces on the marine transmission thrust bearing, the line shaft bearing should be located at least 12, and preferably 20, or more shaft diameters from the marine transmission output flange. Vee Drives In Vee Drives, the propeller shafting is in two sections. The first section of shafting is from the propeller to a Vee drive unit. The Vee drive unit is a bevel-gear box that allows the shafting to change directions. The Vee drive unit accepts full propeller thrust, transmitting the thrust to the hull through its mounting feet. The disadvantage of the Vee drive arrangement is that the engine center of gravity is relatively high and is further aft than conventional in-line drivelines. This reduces stability and adversely affects hull balance.
Z Drive The Z drive is a drive arrangement where the engine is connected to a right angle gear unit. Jet Drives Definition of Jet Drive The boat is propelled by the acceleration of a flow of water picked up from the bottom of the hull through an inlet grill and forced out through a nozzle mounted in the stern of the boat. This water flow is accelerated by the engine driving a pump impeller.
Advantages of Jet Drive There is no need for a reverse gear. Reverse mode of operation can be. accomplished by means of buckets or vanes on the discharge nozzle, which redirect the jet’s discharge stream forward instead of aft. Operation in water too shallow for conventional propeller systems is possible. Sources of Torsional Vibration Many components in the driveline can cause or contribute to torsional vibration: Irregularity in the flow of water to a propeller caused by struts, appendages,. hull clearance Propeller blade-to-blade pitch inaccuracies. The intermeshing of gear teeth in the marine transmission.
Availability of Torsion Characteristics of Equipment Furnished by Caterpillar Upon request, mass elastic systems of items furnished by Caterpillar will be supplied to the customer without charge so that he can calculate the theoretical TVA. Mass elastic data for Caterpillar diesel engines, marine gears, and generators is covered in the Technical Marketing System WEB (TMIWEB) and in Technical Marketing Information (TMI). Driveline Couplings There are two types of driveline couplings: Rigid and soft. Rigid Couplings Rigid shaft couplings may be classified by the method of attaching the shaft to the coupling. Society of Automotive Engineers (SAE) Standards — SAE J755 Use of SAE standard shaft ends and couplings is recommended. They represent the highest standards of rigidity and reliability. LEGM4728-00 Page 12 of 17.
Caterpillar Engine Installation Guide
LEGM4728-00 Page 13 of 17. LEGM4728-00 Page 14 of 17.
Caterpillar Marine Engine Application Installation Guide
Advantages of the Split Coupling Split couplings can use shaft ends that require no additional machining after receipt from the shafting supplier. Good quality shafting is generally received with a ground or ground/polished finish. The shaft can generally be removed from a split coupling without use of heat or a press. Advantages of the Setscrew Coupling The setscrew coupling allows very easy shaft removal and reinstallation.
Mastering chemistry acs study guide. Setscrew couplings can use shaft ends that require no additional machining after receipt from the shafting supplier; good quality shafting is generally received with a ground/polished finish. Axial Softness Couplings that are axially soft will allow the driving or driven shafts to vary in their end- to-end spacing. The sliding spline joints in the middle of an automotive universal joint shaft that allow the effective shaft length to vary, are shaft couplings with axial softness. Angular Softness Angularly soft couplings allow shaft angle to vary.