|Title of Invention||
"UNIFLOW ROTARY VALVE FOR INTERNAL COMBUSION ENGINES OPERATING ON FOUR STROKE CYCLE"
|Abstract||This invention relates to `Uniflow Rotary valve for Internal combustion Engines operating on four stroke cycle. This valve is made out of solid steel shaft and makes use of a L shaped slot provided in the shaft which allows inlet mixture or the exhaust gases to pass through this L shaped passage at the correct timing by uncovering the inlet or the exhaust port in the cylinder head to passage leading to the combustion chamber. The L shaped passage remains common for both the inlet mixture and the exhaust gases.|
|Full Text||Uniflow Rotary valve for internal combustion Engines operating on four stroke cycle.
This invention relates to a rotary valve for replacing the functions of the presently used poppet valves and the mechanism required to operate these valves.
Rotary valves have been tried out on four stroke engines in the early twentieth century and trials on several variations continuing even today. Most of the valves tried out are bulky, complicated and had several implementation problems.
The present invention provides a rotary valve, a solid shaft with a L shaped slot, which while operating inside a cylinder head bore, with suitably cut passages, for inlet, exhaust and entry to combustion chamber in the head provides all the functions of the valves currently used on four stroke engines and functions even better than these.
The functions of this valve will now be described with the accompanying drawings.
Figure 1 shows the vaive with the L shaped passage. The valve is to be driven at half crankshaft speed, which is achieved by coupling a sprocket on crankshaft to the sprocket fitted to the valve, with double the number of teeth through a chain. Alternatively gears and toothed belt or a system of gears can be used to give a similar effect.
Figure 2 shows a multicylinder version of this valve with four L shaped slots catering to the four cylinders of a four cylinder engine.
Figure 3 shows the Vlave in position in a single cylinder engine cylinder head.
Figure 4 shows the Vlave in different positions as it rotates at half crank shaft speed.
In 4a the valve opens the passage to inlet port (2) and connects it to combustion chamber through passages.
In 4b the valve (6) is closed to combustion space and compression stroke takes place.
In 4c, the valve is still closed to combustion space and the expansion or power stroke occurs.
In 4d, the valve opens the passage in cylinder (5) to exhaust port 1 and connects it to the combustion chamber 3.
1. A rotary valve, cylindrical in shape with L shaped slots equal in number to
the number of cylinders in the engine for replacing the existing valves and
valve operating linkage in an Internal combustion engine operating on four
2. A rotary valve as claimed in claim 1, wherein a single L shaped passage
caters to inlet air / mixture entry and exhaust gas outlet, to and form the
combustion space and also connects to the inlet and exhaust ports at the
3. A rotary valve as claimed in claim 1 and claim 2, operating in a bore in the
cylinder head with inlet and exhaust ports on the cylinder head sides and
a single passage in cylinder head leading to combustion space.
4. A rotary valve as claimed in claim 1. claim 2 and claim 3 where in the
area of admission and exhaust are controlled by the axial length of L
shaped slot in the valve and length of passages in cylinder head
corresponding to this slot.
5. A rotary valve as in claim 4 where in the valve timing Is controlled by the
height of inlet and exhaust passages in cylinder head.
|Indian Patent Application Number||419/CHE/2003|
|PG Journal Number||8/2007|
|Date of Filing||20-May-2003|
|Name of Patentee||UPPALA SRIDHARARAO|
|Applicant Address||PLOT 527, F BLOCK, 80FT ROAD SAHAKARANGAR, BANGALORE 560092|
|PCT International Classification Number||F01L7/2|
|PCT International Application Number||N/A|
|PCT International Filing date|