What is the difference between a crosshead engine and trunk piston engine?

FOR TRUNK PISTON TYPE ENGINES, THE UPPER PART OF THE CON-ROD IS CONNECTED DIRECTLY TO THE PISTON VIA THE GUDGEON BEARING ASSEMBLY. CROSSHEAD ENGINE HAVE A PISTON ROD WHILE TRUNK PISTON ENGINE DONOT. CROSSHEAD ENGINES HAVE A DIAPHRAGM THAT SEPARATES THE CYLINDER SPACE FROM THE CRANKCASE WHILE TRUNK TYPE DONOT HAVE.

Why do engines need a cross head?

A crosshead is a mechanism used as part of the slider-crank linkages of long reciprocating engines and reciprocating compressors to eliminate sideways pressure on the piston. Also, the crosshead enables the connecting rod to freely move outside the cylinder.

Why is it difficult to lubricate a crosshead bearing in a 2 stroke engine?

The crosshead on a slow speed 2 stroke is a difficult bearing to lubricate effectively. The load is continually downward and because the con rod swings about the pin, changing direction each stroke, true hydrodynamic lubrication cannot take place.

What is a trunk engine?

Definition of trunk engine 1 : a steam engine having a piston rod that is a pipe of sufficient diameter to enable one end of the connecting rod to be attached to the crank and the other end to pass within the pipe and be pivoted to the piston. 2 : an engine (as most internal-combustion engines) having a trunk piston.

What is cross head type engine?

Crosshead Type Engine Crosshead engine has a Diaphragm which separate the cylinder spaces from Crankcase. Nature of bearing Assembly at upper part :- In a crosshead type ,the upper part of the connecting rod is a connected to the Crosshead assembly Which consist of crosshead Block,pins and Slippers.

Which diesel engine has trunk type piston?

Trunk piston is a term usually given to the pistons in four stroke medium speed engines. These pistons have composite design which comprises of thin sectioned alloy steel piston crown along with aluminum alloy skirt.

What is telescopic pipe in main engine?

In B&W Engines Telescopic pipe is used for supplying oil to the crosshead which supplies oil to the inlet pipe of piston rod.

What is cross head bearing?

n. a sliding member of a reciprocating engine for keeping the motion of the joint between a piston rod and a connecting rod in a straight line.

What is a piston in marine engine?

Piston is an important part of the combustion chamber of a marine engine which converts the gas force into mechanical power by reciprocating motion. Piston skirt, piston rod and trunk piston are three components of the piston arrangement in marine diesel engines.

What is trunk piston engine?

marine. An internal combustion engine in which the connecting rod is directly connected to the piston by a gudgeon pin (also called piston pin).

What is the difference between a trunk engine and crosshead engine?

The cross head is connected to the piston by a piston rod. In a vertical cylinder crosshead engine there is almost no side load on the piston. The trunk engine is made smaller by a hollow piston rod with the gudgeon in usually at the centre of the piston.

What is the difference between a vertical cylinder engine and crosshead engine?

Both engines used crankshafts and connecting rods. The cross head is connected to the piston by a piston rod. In a vertical cylinder crosshead engine there is almost no side load on the piston. The trunk engine is made smaller by a hollow piston rod with the gudgeon in usually at the centre of the piston.

What are the advantages of a cross head engine?

Using the cross head design of engine allows engines to be built with very long strokes which means the engine can burn a greater quantity of fuel /stroke and develop more power.

What type of piston is used in a cross head engine?

Cross Head & Trunk Piston Engines. There are two basic types of connecting a piston to a crankshaft; Crosshead construction-used by all slow speed two stroke engine manufactures. Trunk piston construction- used in smaller four stroke engines.