What are crosshead bearings?
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 crosshead bearing and where it is used?
In mechanical engineering, a crosshead is a mechanical joint 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.
What is crosshead type piston?
Crosshead Piston: Comprises of Piston crown, Piston skirt and piston rod(used in large two stroke engine) which is connected to crosshead functioning to transfer the side thrust to the engine structure.
Why is it called a crosshead engine?
It is very important in a large two stroke slow speed engine to transfer the power generated in the combustion chamber to the crankshaft without transmitting transverse forces to the piston and large thrust directly to the crankshaft. Hence an arrangement is provided to compensate this which is known as Crosshead.
What is crosshead made of?
Crosshead: The crosshead bracket is made up of steel casting in which the pin is shrink-fitted to form complete crosshead unit. Crosshead pin- The crosshead pin is made of high strength nitride steel with excellent surface finish which helps in lubrication of crosshead bearing.
What is the another name of crosshead?
In this page you can discover 10 synonyms, antonyms, idiomatic expressions, and related words for crosshead, like: crossheading, piston-rod, connecting-rod, roller-bearing, gearwheel, mainshaft, thrust-bearing, propshaft, crankshaft and flywheel.
What is the another name of Cross head?
What is crosshead pin?
The crosshead pin connects the piston rod to the connecting rod. On either side of the crosshead pin are mounted the crosshead slippers. The slippers run up and down in the crosshead guides as the piston and rod are reciprocating and prevent the top of the connecting rod from moving sideways.
How is crosshead lubricated?
Oil supply to the crosshead is via a telescopic pipe from the main LO supply at a pressure of about 2.5 bar. The lower bearing shell (tin aluminium with overlay) has oil grooves with machined wedges . The oil enters via the cut out channel in the centre.
What is bottom end bearing?
A bearing at the larger (crankshaft) end of a connecting rod in an engine. Made of cast steel and each consist of an upper and lower part secured to the connecting rod by means of fitting bolts, the nuts of which are secured.
What is trunk type piston?
Definition of trunk piston : an elongated hollow piston in a single-acting engine or pump which is open at the end and in which the end of the connecting rod is pivoted.
What kind of lubrication is there in crosshead bearing?
For example, many crosshead bearings design requires an additional crosshead lubrication pump to boost the pressure for crosshead bearing lubrication because the pressure cannot be self-generated. Boundary Lubrication: In this type, there is a thin film between two rubbing surfaces, which might have a surface contact.
What is shell bearing?
A bearing shell is one component in a system that includes a housing, shaft and lubricant. The reliability of the bearing shells are dependent on these other components and as such they must be designed in conjunction with the bearing shells as part of a bearing system.
What is the difference between trunk piston and crosshead type of 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.
What is crosshead type diesel?
What is a cross head type diesel engine? What is a crosshead bearing? 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 do you need to know about a cylinder crosshead bearing?
Obtain from Class the identification of which cylinder crosshead bearing is to be inspected. Obtain from the vessel the records of any previous inspections/maintenance carried out on any engine bearings, especially the crosshead bearing under survey inspection.
What is a crosshead on a marine engine?
Marine engines. In many 19th century marine steam engines, the crosshead was a strong metal bar attached to the piston rod and perpendicular to it, which was sometimes used to eliminate transverse forces, as in a steeple engine, and at other times used as a linkage—to side-rods in a side-lever engine or to connecting rods in a square engine.
What information is required for a cross head bearing survey?
Information Required for Cross Head Bearing Survey Obtain from Class the identification of which cylinder crosshead bearing is to be inspected. Obtain from the vessel the records of any previous inspections/maintenance carried out on any engine bearings, especially the crosshead bearing under survey inspection.
What should I do if my car has a crosshead bearing problem?
Also obtain the latest indicator cards and log readings taken from the engine to inspect for excess cylinder pressures, and the latest lube oil analysis to inspect for lube oil condition and impurities. Check that there are no outstanding Conditions of Class on the engine that could affect the crosshead bearing.