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Crankcase, cylinders, pistons, connecting rods, valves, valve-operating mechanism, and crankshaft
Basic Major Components of Reciprocating Engine: CCPCR VVOMC
Crankcase
foundation of an engine
The two halves of crankcase
bearings and bearing supports
Crankcase
the _________ must provide a tight enclosure for the lubricating oil and must support various external and internal mechanisms of the engine.
sufficiently rigid and strong, misalignment
It must be _________ and __________ to prevent ___________ of the crankshaft and its bearings.
cast or forged aluminum alloy
used material for crankcase is made
it is light and strong
cast or forged aluminum alloy is used because?
nose or front
The shape of the _______ or _______ of the crankcase section varies considerably.
tapered/ round
The shape of the nose or front of the crankcase section
Cylinder Pads/Cylinder Mounting Pads
provides a suitable means of retaining or fastening the cylinders to the crankcase.
Cylinder Pads/Cylinder Mounting Pads
The machine surface on which the cylinders are mounted
opposed engine crankcase
crankcase that is consist of two halves of cast aluminum alloy that are manufactured either with sand castings or by using permanent molds.
radial engine crankcase
crankcase that are divided into distinct sections
nose section, power section, supercharger section, accessory section
NPSA: the radial engine crankcase separate into for main section
nose section
mounted in front of the radial engine crankcase bolts directly to the power section.
nose section
usually houses and supports a propeller governor drive shaft, the propeller shaft, a cam ring, and a propeller reduction gear assembly
main / power section
section of the crankcase where the reciprocation motion of the piston is converted to the rotary motion of the crankshaft
main / power section
supports crankshaft bearings, where cylinders are mounted.
crankcase diffuser supercharger section
located behind the power section and also called the fuel induction and distribution section
crankcase diffuser supercharger section
“fuel induction and distribution section”.
accessory section
section in the crankcase that houses the gear trains containing nothing spur and bevel type gears that drive various engine components and accessories
accessory section
It has mounting pads for fuel pump, oil pump, tachometer generators etc.
crank shaft
backbone of the reciprocating engine
crank shaft
main purpose is to transform the reciprocating motion of the piston and connecting rod into rotary motion for the rotation of the propeller.
chromium-nickel molybdenum steel
CNMS: very strong alloy material use for the crankshaft
journal, crankpin, crank cheek/ crank arm,
JCCA: three main parts of the crankshaft
journal
center of rotation of the crankshaft
crankpin
section to which the connecting rod is attached
crank cheek/ crank arm
connects the crank pin to the journal
crankshaft that is not balanced
excessive vibration is cause by the:
counter weight, dampers
usually attached to reduce vibration in the crankshaft
dynamic damper
consist of movable slotted-steel counterweight attached to the crankshaft
Cylinder
portion of the reciprocating engine where power is developed
aluminum alloy
cylinders generally made of:
cylinder head, cylinder barrel
two major parts of a cylinder
cylinder head
provides a place for combustion of fuel/air mixtures
cylinder head
contains the intake valve, exhaust valve, sparkplugs
sparkplugs
stainless steel heli-coil
Nitriding
is a thermochemical process in which the surface of a ferrous metal, such as steel, is enriched with nitrogen. Corrosion resistant
Chroming
is a process that plates chromium on the surface of the cylinder barrel and brings it back to new standard dimensions
valves
where the fuel and air mixture enters the cylinder
mushroom/ tulip
valves are also typed by their shape and are called:
chromic-nickel steel
material for the intake valve, operates at lower temperature
nichrome, silchrome, cobalt-chromium steel
material for the exhaust valve, more heat resistant: -chrome NSCCS
valve head, valve seat, valve face, stem
four major parts of the valve
valve head
ground face that forms a seal against the ground valve seat in the cylinder head
stellite
material made of by the valve faces
walve stem
acts as a pilot for the valve head and rides in the valve guide
metallic sodium
Exhaust valve stems are hollow and partially filled with:
the piston reaches top dead center on the exhaust stroke
intake valve open when:
after top dead center on as the cylinder begin its intake stroke
exhaust valve open when:
valve overlap
both valves are open at the same time
valve timing
this timing of valve is controlled by the valve operating mechanism
valve lift
distance that the valve is lifted off its seat
valve duration
length of time the valve is held open
cam rings
revolves causing the cam rollers to raise the tappet in the tappet guide
cam lobe
bump area
cam shaft
valve mechanism of an opposed engine is operated by:
tappet/ valve lifter
converts the rotational of the cam lobe into reciprocating motion
tappet spring
reduces the shock load when the valve is open
solid lifters/ cam follower
valve clearance
push rod
transmit the lifting force from the cam shaft to the rocker arm
rocker arm
transmitting the lifting force from the rods to the valve
piston
cylindrical member that moves back and forth within a steel cylinder
piston pin
joins the piston to the connecting rod, and sometimes called wristpin, gudgeon pin
piston rings
prevent leakages of gas pressure from the combustion chamber. Major components, Compression ring, oil control ring
compression rings
prevent the gases from escaping past the piston during engine operation
oil control ring
regulates the thickness of oil film on the cylinder wall
connecting rods
the link that transmit forces between the piston and the crankshalf
plain-type connecting rod
fork and blade rod assembly
master and articulated rod assembly
split type connecting assembly
4 types of connecting rod assemblies
Propeller Shaft/ accessory rear section
connecting the propellers from the crank shaft
Gear train
containing both spur and bevel type gears used in different types of engine
spur-type gears
to drive heavier load accessories
Bevel gear
permit angular location of short stub shaft
sumps
used to collect oil circulating the engine
wet sump engine
use the sump as storage tank for oil
dry sump engine
store oil in a remote tank
induction system
brings in are from the outside and delivers the fuel air mixture to the cylinder head where combustion occurs.
exhaust system
collects and disposes of high temperatures gases being discharged by the engine.