FORM 2
THE PATENTS ACT 1970 (39 OF 1970)
&
THE PATENTS RULES, 2003
COMPLETE SPECIFICATION (See section 10 and rule 13)


TITLE OF THE INVENTION NATURALLY ASPIRATED INTERNAL COMBUSTION ENGINE
APPLICANTS
PREMIER LIMITED
AN INDIAN COMPANY
of 58, NARIMAN BHAWAN,
NARIMAN POINT,
MUMBAI-400 021, INDIA

The following specification particularly describes the invention and the manner in
which it is to be performed


NATURALLY ASPIRATED INTERNAL COMBUSTION ENGINE FIELD OF THE INVENTION
The present invention in general relates to a naturally aspirated internal combustion engine and to a method therefor and in particular, to an internal combustion engine having a convenient size and weight and adapted to yield good power and emission results, the machine being capable of being ignited by applying a high compression of the air, rather than by applying a spark plug.
BACKGROUND OF THE INVENTION
Rudolf Diesel of German nationality, was the inventor of the first internal combustion engine which was capable of igniting fuel without a spark. He operated his first successful engine in 1897 and was granted U.S. Patent 608,845 for an "internal combustion engine". Thereafter, naturally aspirated engines are known to persons skilled in the art.
However, with the intensification of application of such naturally aspirated engines in the industry, particularly having regard to the increase in multifacetal needs cropping up in the industry every day, the power and torque yielded by naturally aspirated internal combustion engines in vogue, needed to be substantially enhanced. That apart, there was an immense need to save the fuel economy and to develop a naturally aspirated internal combustion engine, which is of convenient size and weight and involves simple engine design. However, significant development in that view of the matter was far from being achieved for a considerably long period of time.
Accordingly, there was a long felt need to develop a naturally aspirated internal combustion engine, which is of convenient size and weight, involves simple engine design, yields substantially good power and emission results and simultaneously, takes care of fuel economy as well.
The present invention meets the aforesaid ling felt need.
All through out the specification including the claims, the words "naturally aspirated", "inlet valves", "outlet valves", "cylinder", "engine", "compressor", "pump", "lubricant", "combustion ", "piston" are to be interpreted in the broadest sense of the respective terms and includes all similar items in the field known by other terms, as may be clear to persons skilled in the art. Restriction/Limitation if any, referred to in the specification, is solely by way of example and understanding the present invention.

OBJECTS OF THE INVENTION
It is a principal object of the present invention to provide a naturally aspirated internal combustion engine which is adapted to yield substantially good power and emission results.
It is another object of the present invention to provide a naturally aspirated internal combustion engine which gives better fuel economy .
It is another object of the present invention to provide a naturally aspirated internal combustion engine which is of convenient size and weight.
It is yet another object of the present invention to provide a naturally aspirated internal combustion engine which is economic having regard to its simple design of injectors.
It is a further object of the present invention to provide a naturally aspirated internal combustion engine which is adapted to impose lower stresses on its internal components.
It is yet another object of the present invention to provide a naturally aspirated internal combustion engine which is adapted to achieve high engine speeds.
It is another object of the present invention to provide a naturally aspirated internal combustion engine which involves simple engine design.
It is another object of the present invention to provide a naturally aspirated internal combustion engine which is provided with correct tensioned belt drive for service free reliability.
It is another object of the present invention to provide a naturally aspirated internal combustion engine which is provided with rigid, durable engine head and block material.
It is another object of the present invention to provide a naturally aspirated internal combustion engine which involves low noise during its operation.

It is another object of the present invention to provide a method of making a naturally aspirated internal combustion engine which is adapted to yield substantially good power and emission results.
How the foregoing objects are achieved and the other aspects of the present invention will be clear from the following description, which is purely by way of understanding and not by way of any sort of limitation.
SUMMARY OF THE INVENTION
Accordingly, the present invention provides a naturally aspirated internal combustion engine including at least a pre-combustion chamber, operatively connected to at least a main combustion chamber, said combustion chambers being equipped with at least one inlet and at least one outlet means for inflow of air and exhaust gas and also at least a piston means, said engine being further provided with a fuel feed system for its operation.
In accordance with preferred embodiments of the naturally aspirated internal combustion engine of the present invention:
-said pre-combustion chamber and said main combustion chamber includes at least four in line cylinders.
-said pre- combustion chamber is located on a cylinder head and said pre-combustion chamber is connected to the main cylinder of said main combustion chamber by small holes.
-said engine is provided with a lubrication system, adapted to deliver clean oil at the correct temperature and pressure to every part of said engine.
-said engine is provided with a cooling system such that efficient cooling is achieved.
-said fuel feed system includes a fuel tank, fuel filter and a fuel injection pump, said pump being adapted to inject fuel inside said pre-combustion chamber.

The present invention also provides a method of making a naturally aspirated internal combustion engine, including operatively connecting at least a pre-combustion chamber to at least a main combustion chamber, equipping said combustion chambers with inlet, outlet means and a piston means, said method further including operatively connecting a fuel feed system to said engine to ensure its running.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
The nature and scope of the present invention will be better understood from the accompanying drawings, which are by way of illustration of some preferred embodiments and not by way of any sort of limitation. In the accompanying drawings:
Figure 1 illustrates a perspective view of a preferred embodiment of the naturally aspirated internal combustion engine in accordance with the present invention.
Figure 2 illustrates another view of a preferred embodiment of the naturally aspirated internal combustion engine in accordance with the present invention.
Figure 3 illustrates a block diagram of the lubrication system of the naturally aspirated internal combustion engine in accordance with the present invention.
Figure 4 illustrates a block diagram of the cooling system of the naturally aspirated internal combustion engine in accordance with the present invention.
Figure 5 illustrates a schematic lay out of the fuel system of the naturally aspirated internal combustion engine in accordance with the present invention.
DETAILED DESCRIPTION OF THE INVENTION
The following describes some preferred embodiments of the present invention, which are purely for the sake of understanding the performance of the invention, and not by way of any sort of limitation.
As stated hereinbefore, the present invention aims at providing a naturally aspirated internal combustion engine which yields good power and emission results, which gives better fuel economy, involves simple engine design, is of convenient size and weight and involves low noise during operation.

The non-limiting features of the internal combustion engine in accordance with the present invention, may be summed up as follows:
a) Good power and emission results
b) Sound deadened steel oil pan for low noise
c) Simple engine design
d) High pressure FIP
e) Correct tensioned belt drive for service free reliability
f) Rigid, durable engine head and block material
g) Convenient size and weight
The present invention provides a diesel engine and preferably to four cylinders in line naturally aspirated engine. This engine differs from the gasoline powered Otto cycle by using a higher compression of the air to ignite the fuel rather than using a spark plug ("compression ignition" rather than "spark ignition").
It is an indirect injection engine, the term indirect injection refers to a fuel injection where engine delivers fuel into combustion chamber, called a pre combustion chamber, where combustion begins and then spreads into the main combustion chamber. The pre combustion chamber is carefully designed to ensure adequate mixing of the atomized fuel with the heated air due to compression.This gives better fuel economy , power and good emission results.
The accompanying figure 1 illustrates a perspective view of a preferred embodiment of the naturally aspirated internal combustion engine according to the present invention. It shows the intake manifold(1), the EGR(2), the assy, cylinder head(3), the exhaust manifold(4), the assy, cylinder block(5) the oil sump, the altemator(7) and a crankshaft pulley(8).
The accompanying figure 2 illustrates another view of a preferred embodiment of the naturally aspirated internal combustion engine according to the present invention. This view shows the assy, cylinder head(3), the camshaft pinion(9), the timing pinion(10), the assy, fuel injection pump(11) and oil filter(12).

accordance with the present invention, includes at least a pre-combustion chamber, operatively connected to at least a main combustion chamber. The combustion chambers are equipped with inlet and outlet valves for inflow of air and exhaust gas and also at least a piston means. The engine is further provided with a fuel feed system for its operation, the fuel feed system being illustrated in detail in the accompanying figure 5.
The method of making a naturally aspirated internal combustion engine in accordance with the present invention, includes operatively connecting at least a pre-combustion chamber to at least a main combustion chamber followed by, equipping said combustion chambers with inlet, outlet valves and a piston means. The method further includes operatively connecting a fuel feed system to the engine to ensure its running.
The non-limiting principles according to which the naturally aspirated internal combustion engine according to the present invention runs are as follows:
Intake stroke
During the intake stroke, the inlet valve opens and air enters in combustion chamber. In order to enhance the subsequent mixing of air and fuel, the air is swirled as it enters the cylinder because the engine uses pre combustion chamber.
Compression stroke
The piston compresses the air in the cylinder, heating it in the process. During the cycle the air pressure can become as high as 1,350 atmospheres and the temperature can reach 550°C, well above the flash point of the fuel. At the appropriate moment, the fuel injector opens and fuel is injected into the hot air in a very fine mist. The hot air vaporizes the fuel, and combustion begins.
Power stroke
The high pressure resulting from the combustion of the fuel forces the piston in a downward motion, providing power to the engine.
Exhaust stroke
During the exhaust stroke, as the piston moves in an upward direction, unburned gases are forced through the exhaust valve to complete the four strokes.

Precombustion chamber
This chamber is located at the cylinder head and is connected to the engine cylinder by small holes. During the compression stroke, air from the main cylinder enters the precombustion chamber. At this moment, fuel is injected into the precombustion chamber and combustion begins. Pressure increases and the fuel droplets are forced through the small holes into the main cylinder, resulting in a very good mix of the fuel and air. The bulk of the combustion actually takes place in the main cylinder. This type of combustion chamber has multi-fuel capability because the temperature of the prechamber vaporizes the fuel before the main combustion event occurs.
The accompanying figure 3 illustrates a block diagram of the lubrication of the internal combustion engine according to the present invntion.
The engine lubrication system is designed to deliver clean oil at the correct temperature and pressure to every part of the engine. The oil is sucked out the sump into the pump, being the heart of the system, than forced through an oil filter and pressure feeded to the main bearings and to the oil pressure gauge. From the main bearings, the oil passes through feed-holes into drilled passages in the crankshaft and on to the big-end bearings of the connecting rod. The cylinder walls and piston-pin bearings are lubricated by oil fling dispersed by the rotating crankshaft. The excess being scraped off by the lower ring in the piston. A bleed or tributary from the main supply passage feeds each camshaft bearing. Another bleed supplies the timing chain or gears on the camshaft drive. The excess oil then drains back to the sump, where the heat is dispersed to the surrounding air.
A block diagram of the engine cooling system is illustrated in the accompanying figure 4.
The engine cooling system is designed such that efficient cooling is achieved. Cooling is also needed because high temperature damages engine components and lubricants. Internal-combustion engines burn fuel hotter than the melting temperature of engine materials, and hot enough to set fire to lubricants. Engine cooling removes heat energy fast enough to keep temperatures low so the engine can survive.

The accompanying figure 5 illustrates a fuel system of the internal combustion engine according to the present invention showing the fule tank(13), fuel liners(14), fuel filters(15), distribution injection pump(16), high pressure lines(17), injection nozzle(18), fuel return line(19), glow plugs(20), breahter line(21), air vent(22) and tank unit(23).
The fuel system feed diesel to run engine. If anyone of the parts in the system break down engine will not run. Let's look at the major parts of the fuel system, Fuel is stored in fuel tank(13). When fuel is filled up at fuel station the fuel travels down the filler tube and into the tank. In the tank there is a sending unit which tells the fuel gauge how much fuel is in the tank. Fuel filters (15) are employed to ensure that clean fuel is supplied to ensure prolonged engine life and performance. Fuel injectors have tiny openings which clog easily, so filtering the fuel is the only way to prevent this. Filters are installed after the fuel tank.
Fuel Injection Pump(16) injects atomized fuel inside pre- combustion chamber, fuel mixes with hot air in a very fine mist. The hot air vaporizes the fuel, and combustion begins.
The non-limiting salient advantages of the naturally aspirated internal combustion engine according to the present invention may be summarized as below:
a) The engine is smaller in size & weight less for its power.
b) The injection direction is of less importance compared with direct injection.
c) Indirect injection injectors are simple in design and the injection pressures is low as compared to direct injection engine which makes PLD engine cheaper.
d) Indirect injection imposes lower stresses on internal components means at the time of fluctuation in mean effective pressure,cylinder head components are safe.
e) Higher engine speeds can be reached, since burning takes place in the
prechamber.
f) The engine involves simplified design and is consequently cheaper.
g) The engine involves substantially low noise.
h) The engine is adapted to yield substantially good power and emission results, i) The engine gives good fuel economy.
The technical advancements and economic significance achieved by the present invention were established after exhaustive experiments and trials and such technical advancement and economic significance were hitherto not achieved or

The present invention has been described with reference to some drawings and preferred embodiments, purely for the sake of understanding and not by way of any limitation and the present invention includes all legitimate developments within the scope of what has been described hereinbefore and claimed in the appended claims.
WE CLAIM:
1. A naturally aspirated internal combustion engine including at least a pre-combustion chamber, operatively connected to at least a main combustion chamber, said combustion chambers being equipped with at least one inlet and at least one outlet means for inflow of air and exhaust gas and also at least a piston means, said engine being further provided with a fuel feed system for its operation.
2. The internal combustion engine as claimed in claim 1, wherein said pre-combustion chamber and said main combustion chamber includes at least four in line cylinders.
3. The internal combustion engine as claimed in claims 1 to 2, wherein said pre-combustion chamber is located on a cylinder head and said pre-combustion chamber is connected to the main cylinder of said main combustion chamber by small holes.
4. The internal combustion engine as claimed in claims 1 to 3, wherein said engine is provided with a lubrication system, adapted to deliver clean oil at the correct temperature and pressure to every part of said engine.
5. The internal combustion engine as claimed in claim 4, wherein said engine is provided with a cooling system such that efficient cooling is achieved.
6. The internal combustion engine as claimed in claim 1, wherein said fuel feed system includes a fuel tank, fuel filter and a fuel injection pump, said pump being adapted to inject fuel inside said pre-combustion chamber.

7. A method of making a naturally aspirated internal combustion engine, including operatively connecting at least a pre-combustion chamber to at least a main combustion chamber, equipping said combustion chambers with inlet, outlet means and a piston means, said method further including operatively connecting a fuel feed system to said engine to ensure its running.
Dated this 18th Day of September 2009.
For Premier Limited
Signature
Name: MAITREYA V. DOSHI (APPLICANT)
Designation: CHAIRMAN & MANAGING DIRECTOR