Two stroke engine

Details Two stroke engine Two stroke engine

2002-05-06

2003-12-16

Yuen, Henry C. (Department: 3747)

Internal-combustion engines

Two-cycle

Whirl through piston-controlled ports

Reexamination Certificate

active

06662764

ABSTRACT:

FIELD OF THE INVENTION
This invention relates to the two stroke engine, mainly an improvement to reduce the high pollution contained in the exhaust, a dominant weakness the traditional two stroke engine has ever embraced. Particularly, it requires no mixing of engine oil to be added during the refilling with gasoline.
BACKGROUND OF THE INVENTION
Please refer to
FIGS. 1 and 2
. They are schematic diagrams showing the general two stroke engine where the cylinder
10
provides an intake way
11
and an exhaust way
12
at the opposed direction. A piston
13
has a piston ring
131
installed on the piston crown to choke the gasoline mixture with the cylinder
10
. A connecting rod
14
has a piston pin
15
at one end being locked in the piston
13
and the other end connected to the crankshaft
17
within the crank case
16
. When the piston
13
comes up and compresses the gasoline mixture in the combustion chamber of cylinder
10
, an explosion follows as the spark plug
18
ignites the compressed gasoline mixture, and the piston
13
is thus moved down. When the piston
13
moves down to the exhaust way
12
, the exhaust flows out right at this moment. The flowing of the exhaust through the exhaust way
12
will create a venturi effect and a negative pressure in the combustion chamber in the cylinder
10
as compared with the preset pressure in the crank case
16
, the gasoline mixture will be sucked into the cylinder
10
through the intake way
11
(with one way valve), and the piston
13
and the connecting rod
14
will continue to move up by the rotary force of the crankshaft
17
to proceed the second compress ion and explosion and so on. It is easy to learn that the two stroke engine is simple in construction, less loss in power, benefiting greater horsepower and long service time. In down movement of the piston
13
, because there exist an intake way
11
and an exhaust way
12
on both sides, there is no way to reserve the engine oil in the crank case
16
. Therefore, the engine oil has to be added to the gasoline while refilling where the engine oil will form a lubricating film along the piston after explosion, resulted in an incomplete combustion, a culprit for pollution.
FIG. 3
shows a schematic diagram of a four stroke engine, where the engine oil is stored in the crank case
16
, and intake way
20
and the exhaust way
21
are moved to the top of the cylinder
10
. When the piston
13
moves upward in the cylinder
10
, it is not necessary for the piston
13
to bring up the engine oil to the intake way
20
and exhaust way
21
, the four stroke engine entails no engine oil to be mixed with the gasoline, a complete combustion is therefore achieved and the exhaust is more environmental-friendly. However, in the four stroke engine, the intake valve
20
and the exhaust valve
21
need to be controlled by the camshaft (not shown), inefficiency caused by a complicated mechanism, heavy consumption of energy and less horsepower is unavoidable.
Comparing the merits and demerits between the two stroke engine and the four stroke engine, after many years' endeavor to the research and development, tests and experiments, the inventor has come up a practicable two stroke engine in which all merits are conserved and all demerits are removed in an attempt to upgrade the motorcycle industry and to solve the pollution the motorcycle yields.
SUMMARY OF THE INVENTION
The invention mainly employs a sleeve piston structure over the main piston which serves to block the engine oil from arousing to the intake way and exhaust way along the piston wall while the piston moves up. It therefore requires no adding engine oil to the gasoline to ensure a clean exhaust pursuant to the emission standard set forth by environmental protection requirements.


REFERENCES:
patent: 2458111 (1949-01-01), Soltesz
patent: 4576126 (1986-03-01), Ancheta
patent: 4663938 (1987-05-01), Colgate
patent: 6145488 (2000-11-01), Plechner
patent: 1300556 (2003-04-01), None

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