Table of Contents
The Bed Plate Function
Bedplate rigid seating for the crankshaft, which is absolutely essential for satisfactory engine operation. engine Bed plate takes up the static load from the running gear and the other constructional components. It also takes up the dynamic load coming down the piston and connecting rod during operation.
Bed Plate Construction
The Bedplate is the foundation for 2 stroke engine. It must be rigid enough to support the weight of the rest of the engine and maintain the crankshaft, which sits in the bearing housings in the transverse girders, in alignment. At the same time, it must be flexible enough to hog and sag with the foundation plate. The foundation plate is a part of the ship’s structure.
If the bedplate becomes too stiff, so if the hull flexed, it will possibly snap the holding down bolts that lock the engine into the ship and there would be a danger of breaking the bedplate.
The bedplate is essentially composed of two longitudinal girders that run the engine length. Such longitudinal girders link by the transverse girders mounted between each throw of the crankshaft and either side of the collar of the thrust. The key bearing pockets for the crankshaft to run within are built into the transverse girders.
Construction Materiel
The bed-plate is manufactured from cast iron as a single casting on the small-bore engines. Larger engines come with a designed bedplate. It ensures the steel castings and plates weld Together From Steel Parts. The Steel Complies With the Standards of the Classification Society and is low carbon steel with a maximum carbon content of 0.23%. Earlier Made Bedplates had Longitudinal girders and box sections.
The modern bedplate makes with fabricated longitudinal girders. Its cast steel cross-sections contain bearing pockets and ties bolt holes welded in place. After manufacturing, the bedplate is relieved of the stress the bean pockets are line bored and the landing surfaces are machined.
Checking Bed Plates For Cracking
The bedplate should inspect frequently for proof of cracking. This can occur within the welds becoming a member of the transverse girders to the longitudinal, and below the bearing pockets, in which the cracks may be radial or follow the line of the pocket. As properly as faulty production techniques, causes may be uneven loading/ overloading of engine units, unfastened tie bolts, and unfastened protecting down bolts.
