TWI826413B - A spark ignition rotary valve internal combustion engine - Google Patents

Abstract

A rotary valve internal combustion engine comprising a combustion chamber being defined in part by the piston and the combustion end of the cylinder, a valve housing fixed at an outer portion of the combustion end of the cylinder and defining a bore and a rotary valve rotatable about a rotary valve axis with a close sliding fit in the bore in the valve housing, the rotary valve having a hollow valve body subjected to combustion gases throughout the combustion process, and further having in a wall part thereof a port giving, during rotation of the valve, fluid communication successively to and from the combustion chamber via inlet and exhaust ports in the valve housing The engine is a spark ignition engine, the spark plug being screwed into a plug bore in the valve housing adjacent the valve body, the axis of the plug bore where it meets the valve body being axially below the centreline of the valve ports.

Description

Spark ignition rotary valve internal combustion engine

The present invention relates to a spark ignition rotary valve internal combustion engine, wherein the control of air intake and exhaust of the internal combustion engine is accomplished by a rotary valve.

A spark ignition rotary valve internal combustion engine including: a piston connected to a crankshaft and reciprocating in a cylinder having a combustion end, a combustion chamber partially defined by the piston and the combustion end of the cylinder, a valve cover , fixed outside the combustion end of the cylinder and defining a hole in the hole of the valve cover and a rotary valve that rotates along the rotary valve axis. The rotary valve has a hollow valve body, and the hollow valve body has an internal volume, Forming part of the combustion chamber, wherein the inner volume of the hollow valve body accommodates combustion gases during the combustion process, and further has an interface in its wall portion for providing inlet and outlet interfaces within the valve cover when the valve rotates Liquid flow flows sequentially from and to the combustion chamber.

The object of the present invention is to improve the combustion efficiency of the above-mentioned internal combustion engine.

The invention provides a spark ignition rotary valve internal combustion engine, which includes: a piston connected to a crankshaft and capable of reciprocating in a cylinder; the cylinder has a combustion end; a combustion chamber is partially composed of the piston and The combustion end of the cylinder is defined by a valve cover fixed to the outside of the combustion end of the cylinder and defining a hole in the hole of the valve cover and a rotary valve that rotates along the rotary valve axis, the rotary valve having a hollow valve body, the hollow valve body has an inner volume that forms a part of the combustion chamber, wherein the inner volume of the hollow valve body accommodates combustion gases during the combustion process, and further has an interface in its wall portion for when the valve rotates. Liquid flow is provided in the valve housing through input and discharge interfaces to sequentially flow from and to the combustion chamber, wherein the internal combustion engine is a spark ignition internal combustion engine, and the spark plug is screwed into the valve housing adjacent to the valve body. A plug hole, the axis of the plug hole intersects the valve body below the axial centerline of the valve interface.

In a preferred embodiment, the thread of the spark plug partially extends through the plug hole, and the remainder of the plug hole extending to the combustion chamber is smooth.

In one embodiment, the axis of the plug hole is 90 degrees to the rotation axis of the valve body. In another embodiment, the axis of the plug hole is inclined at an acute angle with the axis of rotation of the valve, and the spark plug volume is adjacent to the main cylinder, that is, adjacent to where the upper surface of the main cylinder intersects with the valve hole.

Preferred embodiments of the present invention will be described below with reference to the drawings.

1:piston

2:Cylinder

3: Crankshaft

4: Combustion chamber

5: Rotary valve

5a:shaft

6: Drive shaft

7:Single roller ball bearing

8: Valve cover

9: Driven gear

10:Driving gear

11: Drive components

12: Drive shaft

13:Lower bearing

14:Crankcase

15,16: Helical gear

17:Pipeline

18: Upper bearing

19: Valve body

20: volume

21:Interface

22: Lower perimeter

23: wall

24:Mars Plug

25: Plug hole

26: Spark plug volume

Figure 1 shows a cross-sectional view of a single-cylinder air-cooled spark ignition rotary valve internal combustion engine.

Figure 2 shows a partially enlarged schematic view of the rotary valve body and spark plug.

Figure 3 shows an embodiment in which the spark plug hole is inclined at an acute angle with the axis of the cylinder.

Figure 1 shows a single-cylinder air-cooled spark ignition rotary valve internal combustion engine. The internal combustion engine has a cylinder cover including the cylinder 2 . A piston 1 is connected in a conventional manner to a crankshaft 3 that rotates in a crankcase 14 and can travel back and forth in the cylinder 2 . The upper part of the cylinder 2 is enclosed by a combustion chamber 4 with a combustion chamber cover. A rotary valve 5 controls the flow of mixed air/fuel and exhaust gases into and out of the combustion chamber 4 . In this embodiment, the valve 5 can rotate along an axis 5a coaxial with the cylinder 2 in a valve cover 8 in the combustion chamber cover. In other embodiments, the rotation axis of the valve body is offset from the axis 5a of the cylinder 2 .

At one end away from the combustion chamber 4, the rotary valve 5 has a central drive shaft 6 with a single-race ball bearing 7 to rotatably support the valve 5 in the valve cover 8. The valve driving shaft 6 is fixed to a coaxial driven gear 9 which meshes with a driving gear 10 of a driving member 11 , so that the driven gear 9 and the rotary valve 5 are connected to the crankshaft 3 . The drive member 11 includes a drive shaft 12 located in a channel or line 17 of the cylinder cover, arranged for rotation on an upper bearing 18 adjacent the drive gear 10 and a lower bearing 13 adjacent the crankshaft 3 . The driving member 11 has a helical gear 15 which is meshed and fixed to a corresponding helical gear 16 of the crankshaft and rotates together with the crankshaft 3 . Therefore, the rotation of the crankshaft 3 and the movement of the piston can be coordinated by the rotation of the rotary valve 5, so that the internal combustion engine operates with a conventional four-stroke cycle. In order to achieve the above purpose, the diameter of the driven gear 9 should be twice that of the driving gear 10, so the rotation speed of the rotary valve 5 is half of that of the internal combustion engine.

Figure 2 reveals the details of the rotary valve 5. The rotary valve 5 includes a substantially cylindrical rotary valve body 5, which can rotate along a rotary valve axis 5a and has a tight sliding fit in the hole of the valve cover 8. The rotary valve 5 5 has a hollow valve body with an internal volume 20 forming part of the combustion chamber. The valve has a substantially cylindrical body part, including the valve body 19 with an inner diameter slightly larger than the shaft 6, forming a shoulder, and the rolling ring of the ball bearing 7 is arranged relative to the shoulder. The valve body 19 extends into the combustion chamber and has in its interior a volume 20 that forms part of the combustion chamber 4 and contains the combustion gases during all stages of the combustion process. The valve body 19 can rotate in a hole in the valve cover 8 and has a tight sliding fit. The valve 5 and the valve cover 8 are formed of aluminum.

The shaft 6 is part of the rotary valve 5 and has a diameter only slightly smaller than the valve body 19 to provide the shoulder. The shaft is solid and provides a good path for conducting heat from the valve body 19 to the outside.

The rotary valve body 19 has an interface 21, which can sequentially allow liquid to flow from and to the internal volume of the valve when the valve rotates, so that it can flow through the combustion chamber air inlet and exhaust interface of the valve cover. In this embodiment, the interface 21 is in the form of a recess formed on the lower periphery 22 of the valve body wall 23 adjacent to the combustion chamber 4. The recess extends upward from the lower periphery of the valve body wall to form the valve body. Interface 21 on one side.

A spark plug fixed in a plug hole 25 formed in the valve housing 8 and extending to the valve hole provides ignition. The axis of the plug hole 25 intersects the valve body axially below the centerline of the valve interface. In this way, the ignition point is close to the bulk of the input fuel mixture.

The plug hole has a thread, the length of which is just enough to fix the spark plug 24 to the plug hole 25, between the threaded end supporting the spark plug and the opening of the plug hole 25 communicating with the combustion chamber. The remainder of the hole is smooth to improve the flow of input fuel and promote flame communication from the spark plug to the body volume of the combustion chamber 4 .

In another embodiment of the present invention, as shown in Figure 3, the plug hole 25 is inclined at an acute angle relative to the axis 5a of the cylinder 2, and the spark plug volume 26 in the plug hole 25 is adjacent to the main cylinder 2, That is, the upper surface of the adjacent master cylinder 2 intersects with the valve hole. In this manner, ignition is initiated at an ideal point to promote rapid propagation of the flame in the main volume of the air/fuel mixture.

1:piston

2:Cylinder

3: Crankshaft

4: Combustion chamber

5: Rotary valve

5a:shaft

6: Drive shaft

7:Single roller ball bearing

8: Valve cover

9: Driven gear

10:Driving gear

11: Drive components

13:Lower bearing

14:Crankcase

15,16: Helical gear

17:Pipeline

Claims (3)

A rotary valve internal combustion engine, including: a piston connected to a crankshaft and reciprocating in a cylinder, the cylinder having a combustion end, a combustion chamber partially defined by the piston and the combustion end of the cylinder, a valve cover fixed A hole is defined outside the combustion end of the cylinder and in the hole of the valve cover and a rotary valve that rotates along the rotary valve axis. The rotary valve has a hollow valve body. The hollow valve body has an inner volume, forming the A part of the combustion chamber in which the inner volume of the hollow valve body accommodates combustion gases during combustion, and further has a port in its wall portion for providing liquid through the input and outlet ports in the valve cover when the valve rotates The flow flows from and to the combustion chamber in sequence, performing a sealing function between the surface of the rotary valve body and an adjacent surface of the hole in the valve cover, wherein the internal combustion engine is a spark ignition internal combustion engine, and a spark plug is screwed into the phase A plug hole in the valve cover adjacent to the valve body, the axis of the plug hole intersecting the valve body axially below the center line of the valve interface, close to the body volume of the combustion chamber, so that the ignition point is closer to A body of input fuel mixture wherein the threads of the spark plug extend partially through the plug hole and the remainder of the plug hole extending into the combustion chamber is smooth to facilitate communication of flame from the spark plug to the body of the combustion chamber volume. A rotary valve internal combustion engine as described in any one of the above patent applications, wherein the axis of the plug hole is 90 degrees to the rotation axis of the valve body. The rotary valve internal combustion engine as described in any one of items 1 to 2 of the above patent application, wherein the axis of the plug hole is inclined at an acute angle with the rotation axis of the valve, and a spark plug volume in the plug hole is adjacent to the The upper surface of the main cylinder intersects with a valve hole.