Independent rotary valve engine

Patent metadata

Field	Value
Publication number	US-12366183-B1
Application number	US-202519183677-A
Country	US
Kind code	B1
Filing date	Apr 18, 2025
Priority date	Apr 30, 2024
Publication date	Jul 22, 2025
Grant date	Jul 22, 2025

Abstract

A independent rotary valve engine and a method for controlling thereof includes an engine crankcase, a crankshaft located therein, a bidirectional servo motor connected to the engine crankcase, a cylinder block connected to the engine crankcase, and a cylinder head connected to the cylinder block, with a spark plug and a piston linked by a connecting rod to the crankshaft. An intake rotary valve is located within a first channel in the cylinder head, and an exhaust rotary valve is located within a parallel second channel. A pulley connects a servo motor shaft of the bidirectional servo motor to the intake rotary valve. An engine control device, operatively connected to the spark plug and the bidirectional servo motor, generates spark timing signals, receives an engine speed requirement, determines a wide-open throttle position and intake valve closing angle, and generates variable valve timing signals to rotate the servo motor shaft.

First claim

The invention claimed is:

1. An independent rotary valve engine, comprising:
an engine crankcase;
a crankshaft located in a bore in the engine crankcase;
a bidirectional servo motor connected to the engine crankcase;
a cylinder block connected to the engine crankcase;
a cylinder head connected to the cylinder block;
a piston located within a combustion chamber of the cylinder block;
a connecting rod attached between the piston and the crankshaft;
an intake rotary valve located within a first channel in the cylinder head;
an exhaust rotary valve located within a second channel in the cylinder head, wherein the second channel is parallel to the first channel;
a pulley connected to a servo motor shaft of the bidirectional servo motor and a first end of the intake rotary valve;
a spark plug operatively connected within the cylinder head; and
an engine control unit operatively connected to the spark plug and the servo motor, wherein the engine control unit is configured to:
generate spark timing signals configured to actuate the spark plug to combust a fuel mixture in the combustion chamber,
receive an engine speed requirement,
determine a wide-open throttle position and an intake valve closing angle based on the engine speed requirement, and
generate variable valve timing signals configured to rotate the servo motor shaft in one of a clockwise direction and a counterclockwise direction based on the wide-open throttle position and the intake valve closing angle.

2. The independent rotary valve engine of claim 1 , further comprising:
an intake manifold connected to a second end of the intake rotary valve, wherein the intake manifold is configured to inject the fuel mixture into the second end of the intake rotary valve; and
an intake rotary valve port located on the intake rotary valve between the first end of the intake rotary valve and the intake manifold, wherein the intake rotary valve port is configured to release the fuel mixture into the combustion chamber.

3. The independent rotary valve engine of claim 2 , wherein the intake rotary valve port has an elliptical shape, wherein a minor axis of the intake rotary valve port is about 25% of a circumference of the intake rotary valve and a major axis of the intake rotary valve port is about 50% of the circumference of the intake rotary valve.

4. The independent rotary valve engine of claim 2 , further comprising:
a sealing cap located on a first end of the exhaust rotary valve;
an exhaust manifold connected to a second end of the exhaust rotary valve; and
an exhaust rotary valve port located on the exhaust rotary valve between the sealed first end and the second end, wherein the exhaust rotary valve port is configured to receive an exhaust gas from the combustion chamber and release the exhaust gas into the exhaust manifold.

5. The independent rotary valve engine of claim 4 , wherein the exhaust rotary valve port has an elliptical shape, wherein a minor axis of the intake rotary valve port is about 25% of a circumference of the exhaust rotary valve and a major axis of the exhaust rotary valve port is about 50% of the circumference of the exhaust rotary valve.

6. The independent rotary valve engine of claim 4 , wherein the intake rotary valve comprises:
an inner intake rotary valve shaft which includes the first end of the intake rotary valve, wherein the first end is connected to the pulley; and
an outer sleeve configured to surround the inner intake rotary valve shaft.

7. The independent rotary valve engine of claim 6 , further comprising:
a sprocket and chain mechanism connected to the outer sleeve of the intake rotary valve, to the exhaust rotary valve and to the crankshaft, wherein the sprocket and chain mechanism is configured to rotate the outer sleeve of the intake rotary valve and the exhaust rotary valve simultaneously based on the rotation of the crankshaft.

8. The independent rotary valve engine of claim 7 , further comprising:
a first inner intake rotary valve shaft bearing located between the pulley and the first end of the inner intake rotary valve shaft;
a first outer sleeve bearing located near the first inner intake rotary valve shaft bearing, wherein the first outer sleeve bearing is configured to rotatably connect the first inner intake rotary valve shaft to the outer sleeve;
a first intake rotary valve seal located between the first inner intake rotary valve shaft bearing and the first outer sleeve bearing, wherein the first intake rotary valve seal is configured to prevent loss of the fuel mixture from the first end of the intake rotary valve; and
a second intake rotary valve seal located between the first outer sleeve bearing and the intake rotary valve port, wherein the second intake rotary valve seal is configured to prevent loss of the fuel mixture between the inner intake rotary valve port and the outer sleeve.

9. The independent rotary valve engine of claim 8 , further comprising:
a second inner intake rotary valve shaft bearing located on the second end, wherein the second inner rotary valve shaft bearing is configured to rotatably connect the second end of the inner intake rotary valve shaft to a connection pipe of the intake manifold;
a second outer sleeve bearing located between the intake rotary valve port and the second inner intake rotary valve shaft bearing;
a third intake rotary valve seal located between the second inner intake rotary valve shaft bearing and the second outer sleeve bearing, wherein the third intake rotary valve seal is configured to prevent loss of the fuel mixture between the second end of inner intake rotary valve shaft and the outer sleeve; and
a fourth intake rotary valve seal located adjacent to the second outer sleeve bearing, wherein the fourth intake rotary valve seal is configured to prevent loss of the fuel mixture from the intake rotary valve port to the outer sleeve.

10. The independent rotary valve engine of claim 7 , further comprising:
a first exhaust rotary valve bearing located adjacent the sealing cap of the exhaust rotary valve; and
a first exhaust rotary valve seal located on the exhaust rotary valve between the first exhaust rotary valve bearing and the exhaust rotary valve port, wherein the first exhaust rotary valve seal is configured to prevent backflow of the exhaust towards the first end.

11. The independent rotary valve engine of claim 10 , further comprising:
a second exhaust rotary valve bearing located on the second end of the exhaust rotary valve, wherein the second exhaust rotary valve bearing is configured to rotatably connect the second end of the exhaust rotary valve to a connection pipe of the exhaust manifold; and
a second exhaust rotary seal located adjacent to the second exhaust rotary valve bearing between the second exhaust rotary valve bearing and the exhaust rotary valve port, wherein the second exhaust rotary seal is configured to prevent loss of the exhaust from the second exhaust rotary valve bearing.

12. The independent rotary valve engine of claim 7 , wherein the bidirectional servo motor is configured to rotate the servo motor shaft to turn the pulley, wherein turning the pulley is configured to rotate the inner intake rotary valve to one of move the inner intake rotary valve port at least partially over the combustion chamber to expel an air/fuel mixture into the combustion chamber and to move the inner intake rotary valve port away from the combustion chamber to permit ignition of the air/fuel mixture by the spark plug.

13. The independent rotary valve engine of claim 12 , wherein the engine control unit is configured to generate the intake valve timing sign

Assignees

• Univ King Fahd Pet & Minerals

Inventors

• Khan Sikandar
• Fayyaz
• Javed Hassan
• Waqas Muhammad
• Jazim Agha Muhammad

Classifications

• F01L7/021

  with one rotary valve · CPC title

• F01L7/026 Primary

  with two or more rotary valves, their rotational axes being parallel, e.g. 4-stroke · CPC title

• F01L1/34

  characterised by the provision of means for changing the timing of the valves without changing the duration of opening {and without affecting the magnitude of the valve lift} · CPC title

• F01L1/024 Primary

  Belt drive · CPC title