Table of Contents
What is the purpose of the bedplate?
The important functions of bedplate are: To support the static load of stationary engine frame and blocks. To support the dynamic load of the running gear. To support the crankshaft and hold it in perfect alignment.
How is the cylinder firing load transferred to the bedplate?
The forces produced by the gas pressure in the cylinders are transmitted from the top of the cylinder block directly to the bedplate by the tie bolts (tie rods).
Which part of the bedplate supports the main bearing and crankshaft?
Construction of Bedplate: In slow speed engine design, it consists of a deep longitudinal box section with stiffening in the form of members and webs. Transverse members are fitted between each throw of the crankshaft. These support the main bearing saddles and Tie -rod connection.
What is an engine bedplate?
A structure which forms the base of an engine upon which the bearings and frame are mounted. “The bedplate consists of high, welded longitudinal girders and cross girders with cast steel bearing supports.”
What is the component held between main bearings of the bedplate?
In the next article we will take up the component which is held between the main bearings of the bedplate namely the marine diesel engine crankshaft and will talk about its construction, loading and checks. 1. Image of Doxford 58J4 Bedplate 2. Bedplate Sketch – Sanyal, D.K. (1998) Principles & Practice of Marine Diesel Engines.
What is a bed plate on an engine?
Built into the transverse girders are the main bearing pockets for the crankshaft to run in. On the small bore engines, the bedplate can be made from cast iron as a single casting. Larger engines have a fabricated bedplate. This means it is welded together from steel sections, steel castings and plate.
What are the problems with a bedplate?
Problems were encountered with cracking of the transverse girders, which increased as engine powers and crankshaft throws got larger. The modern bedplate is constructed from fabricated longitudinal girders with cast steel transverse sections containing the bearing pockets and tie bolt holes welded into place.
What happens if the bedplate of a ship is too rigid?
If the bedplate was too rigid, then as the hull flexed, the holding down bolts, which secure the engine into the ship would be likely to break, and there would be a danger of the bedplate cracking. Basically the bedplate consists of two longitudinal girders which run the length of the engine.