Product Description; Gas Spark-Ignition Engine With Accessories - Viessmann VITOBLOC 200 Technical Description

Product description

2 Product description
The cogeneration module consists of a wide variety of
subassemblies and components that this chapter will
explain to you. The subassemblies and components
are part of the scope of delivery of the cogeneration
module.
2.1 Gas spark-ignition engine with
accessories
2.1.1 Gas spark-ignition engine
This gas spark-ignition engine is operated as an
internal combustion engine (aspirating engine) without
turbocharging and at an air ratio of lambda = 1.
A compressed oil jet cools the piston heads. The
exhaust gases are drained through a water-cooled
exhaust gas collector pipe.
Components
The crankcase is cast in one piece together with the
cylinder block. The cylinder support with 4 cylinders
arranged in line forms the close of the crankcase.
The cylinder liners are wet-running, replaceable and
made of cast iron. The gearbox is arranged on the
flywheel side of the crankcase. It includes the
crankshaft seal and drive gears for the camshaft and
oil pump. The crankshaft made of chromium-
molybdenum steel is forged in the forging die and
nitride hardened. It is lodged at the end and between
the cylinders. The crank pins are intended for lodging
one connecting rod each.
The bearing shells are made of lead/bronze with a
lead/indium covering and they have a steel back. The
connecting rods are also forged of chromium-
molybdenum steel in the forging die and they are
made slanted.
The pistons are made of a low-expansion aluminium
alloy. The form of the piston crown creates an open
combustion chamber. Three grooves are embedded
into the piston crown for the piston rings. The
camshaft is made of a cast iron/chromium alloy with
hardened cams and lodged at the ends and between
the pistons.
VITOBLOC 200 EM-50/81
It is arranged lying low in the crankcase. The cylinder
heads made of cast iron for each cylinder are
fastened onto the crankcase. They have cooling
ducts, holes drilled for holding the spark plugs and
one intake and exhaust valve per cylinder. The
valves mounted to be suspended have replaceable
valve bushings.
2.1.1 Engine lubricating oil system
The engine is lubricated with a pressure circulating
lubrication system.
The oil is pumped via gear-driven oil pump from the
oil sump through the oil cooler that is designed as an
oil/water ribbed tube cooler. The lubricating oil is
purified through an oil filter cartridge with a paper
insert in the main flow. From there, the filtered oil is
distributed over various oil channels.
The oil lubricates the crankshaft bearings, the
connecting rod bearings, the piston pins, the camshaft
bearings and the rocking arms. The gears are
lubricated in the gearbox with splash oil within the
crankcase. The crank space ventilation is connected
to the combustion air suction via oil screen.
Components
The engine lubricating oil system consists of the oil
sump, an oil pump, and oil filter with a paper insert
and various oil channels.
Special characteristics
The crank space ventilation is connected to the
combustion air suction via oil screen.
ESS Energie Systeme & Service GmbH 7