1. MOVING SLEEVE FOR TWO STROKE ENGINE
2. Field of invention:- B. The following specification particularly describes the
invention and the manner in which is to be performed. This invention related to
two stroke internal combustion engine with benefits ofifour stroke internal
I combustion engine.
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3. ~ a c k ~ r o u nodf invention with regards to the drawback associated with
known arts: - We know about the internal combustion engine very well. There
are so many working modeis of various types of internal combustion engines like ,
two stroke engine, four stroke engine, sterling engine, radial engine. But two
stroke and four stroke internal combustion engine is popular and
commercialized. Between of two, four stroke engines has advantage over two
stroke engine, even then the two stroke engine has better power weight ratio than
four stroke engine. But due to bad scavenging and high pollution level the two
stroke engine has been obsolete from the market. The moving sleeve works as a
valve and getrid of mixing the lubricating oil resulting low pollution.
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4. Object of the invention:- Theobject of this invention is to improve two stroke 1 1
internal combustion engine. Improve the scavenging and fulfill the emission
norms, mixing of lubricating oil will not required as alredy required in todays
two stroke engines. Lubricating system in this engine is same as conventional
four-stroke engine. 1
5. Statement of invention:- The present invention is related with an improvement
of two stroke internal combustion engine. It has a sleeves which cover the
exhaust port and inlet port. When the piston comes near bottom dead centre and
exhaust port start to open the sleeve come down with piston and moves along
with piston upto bottom dead centre. It moves back with piston upto closing
point of exhaust port and rest here till next stroke. Four stroke lubricating system
can be adopted in this engine. Therefore no need to mix the lubricants with the
fuel in this engine. Resulting less pollution.
6. A Summary of invention:- The Present invention convert the lubricating system
of a two stroke engine into four stroke engine. A sleeve is provided inside the
cylinder whose inner dia is equal to the cylinder. Therefore, piston moves freely
inside the sleeve. The top end of sleeve is positioned on the top end of exhaust
port with the help of springs. T shape sleeve is moved towards Bottom Dead
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Centre, when it pushed by piston. It moved back with piston. Sleeve close the
inlet port and outlet port. pfter closing of ports, the lubricating system works
same as in the conventional four-stroke engine.
7. A brief description of ac,companying drawings:-
In all drawings the numbers shows the part of engine as mentioned below:-
1. Cylinder
2. Piston
3. Inlet Port
4. Exhaust Port
5. Moving' sleeve
Drawing no. 1/3 - It shows the position of piston near top dead centre.
Drawing No. 213 - It shows the pqsition of piston, when piston, moving sleeve and
exhaust ports top end are in one line. Exhaust port and inlet port
is just to open.
Drawing No. 313 - It shows the position of piston at bottom dead centre alongwith
sleeve. Inlet port and exhaust port are open, -
8. Detail description of the invention with reference to drawings examples.
According to drawing no. 1/3 - In this drawing piston (2) is at top dead
centre and moved towards bottom dead centre after expension of gases in
cylinder (1).
According to drawing no. 2/3 - In this drawing pigton (2) is in .the line of
sleeve (5) and top end of exhaust port (4) As soon as piston (2) move towards
bottom dead centre the sleeve (5) come down with piston (2) and open the
exhaust port (4) and inlet port (3) in same manner as conventional two stroke
engine.
/' According to drawing no. 313 - In this drawing piston (2) is at bottom dead
1' centre. After scavenging and loading of fresh charge the piston (2) moves
towards top dead centre. The sleeve (5) sit in its resting position with the help
of springs which is not shown in the drawings to decrease the complicacy.
After siting the sleeve (5) the lubricating system works ,same as conventional
1 four stroke engine. Therefore no need to mixing the lubricant in the fuel. This
d is the benefit of this invention.

Claims
I claim(1) a two stroke internal combustion engine provided a moving sleeve to close the inlet port and exhaust port so that the lubricating system designed same as four stroke engine.