Balanced five cycle engine with shortened axial extent

• US 20030150410A1
• Filed: 02/14/2002
• Published: 08/14/2003
• Est. Priority Date: 02/14/2002
• Status: Active Grant

• Current Assignee: Leonhard Schuko
• Original Assignee: Leonhard Schuko
• Inventors: Schuko, Leonhard
• Granted Patent: US 6,662,762 B2
• Time in Patent Office: Days
• US Class Current: 123/56.1
• CPC Class Codes: F02B 2075/028 five
• CPC Class Codes: F02B 75/28 Engines with two or more pistons reciprocating within same cylinder or within essentially coaxial cylinders arranged oppositely relative to main shaft F02B75/24
• CPC Class Codes: F02B 75/30 with one working piston sliding inside another

Abstract

A five-cycle internal combustion engine in which a plurality of first cylinders and a plurality of second cylinders, having axes disposed in annularly spaced relation about the longitudinal axis of the housing assembly, and in annularly spaced relation with respect to one another. The inlet and outlet end portions of the first cylinders are arranged in axially opposite relation with respect to the inlet and outlet end portions of the second cylinders respectively. The first and second inlet and outlet cams associated with the first and second cylinders respectively are related to each other so that the transfer cycle movements of the inlet and outlet pistons in the first cylinders are accompanied by a generally equal and axially opposite transfer cycle movement of the inlet and outlet pistons in the second cylinders so that all transfer cycle movements of the first and second inlet and outlet pistons and the associated first and second inlet and outlet cam followers are axially balanced. Also disclosed is an improvement capable of varying the compression ratio of the five cycle engine providing a compression ratio adjusting system constructed and arranged to effect axial movement between the cooperating inlet and outlet cams so as to vary the spacing between the inlet and outlet pistons in each cylinder at the combustion position thereof so as to vary the minimum volume condition defined thereby in relation to the volume defined by the compression position thereof.

Claims

1. A five cycle internal combustion engine comprising:

a housing assembly having a longitudinal axis,

a plurality of first cylinders in said housing assembly having parallel axes disposed in annularly spaced relation about said longitudinal axis,

a plurality of second cylinders in said housing assembly having parallel axes disposed in annularly spaced relation about said longitudinal axis and in annularly spaced relation with respect to the axes of said first cylinders,

each of said plurality of first and second cylinders including an inlet end portion having an inlet port therein, a central working portion and an outlet end portion having an outlet port therein,

the inlet end portion and the outlet end portion of said plurality of first cylinders being arranged in axially opposite relation with respect to the inlet end portion, and the outlet end portion of said plurality of second cylinders respectively,

a first inlet piston mounted in each first cylinder constructed and arranged to be moved in sealing relation to the associated first cylinder from an inlet end position wherein the inlet port thereof communicates with the working portion thereof in an axial direction away from said inlet end position into an inlet port cut-off position wherein said inlet piston cuts off communication of the inlet port thereof with the working portion thereof and beyond into the working portion thereof,

a second inlet piston mounted in each second cylinder constructed and arranged to be moved in sealing relation to the associated second cylinder from an inlet end position wherein the inlet port thereof communicates with the working portion thereof in an axial direction away from said inlet end position into an inlet port cut-off position wherein said inlet piston cuts off communication of the inlet port thereof with the working portion thereof and beyond into the working portion thereof,

a first outlet piston mounted in each first cylinder constructed and arranged to be moved in sealing relation to the associated cylinder from an outlet end position wherein the outlet port thereof is communicated with the working portion thereof in an axial direction away from said outlet end position into an outlet port cut-off position wherein said outlet piston cuts off the communication of the outlet port thereof with the working portion thereof and beyond into the working portion thereof,

a second outlet piston mounted in each second cylinder constructed and arranged to be moved in sealing relation to the associated second cylinder from an outlet end position wherein the outlet port thereof is communicated with the working portion thereof in an axial direction away from said outlet end position into an outlet port cut-off position wherein said outlet piston cuts off the communication of the outlet port thereof with the working portion thereof and beyond into the working portion thereof,

rotor structure within said housing assembly constructed and arranged to move with a rotational movement about said longitudinal axis,

a first annular inlet cam disposed annularly about said longitudinal axis axially outwardly of the inlet end portions of said first cylinders,

a first inlet cam follower operatively connected between said first annular inlet cam and each of said first inlet pistons so as to effect axial movements thereof in opposite directions during the rotation of the rotor structure about said longitudinal axis,

a second annular inlet cam disposed annularly about said longitudinal axis axially outwardly of the inlet end portions of said second axis cylinders,

a second inlet cam follower operatively connected between said second annular inlet cam and each of said second inlet pistons so as to effect axial movements thereof in opposite directions during the rotation of the rotor structure about said longitudinal axis,

a first annular outlet cam disposed annularly about said longitudinal axis axially outwardly of the outlet end portions of said first cylinders,

a first outlet cam follower operatively connected between said first annular outlet cam and each of said first outlet pistons so as to effect axial movements thereof in opposite directions during the rotation of the rotor structure about said longitudinal axis,

a second annular outlet cam disposed annularly about said longitudinally axis axially outwardly of the outlet end portions of said second cylinders,

a second outlet cam follower operatively connected between said first annular outlet cam and each of said first outlet pistons so as to effect axial movements thereof in opposite directions during the rotation of the rotor structure about said longitudinal axis,

said first and second inlet and outlet annular cams being configured to move the first and second inlet and outlet pistons respectively within each cylinder through a successive five cycle repeating movement which includes (1) a power cycle wherein said first and second inlet and outlet pistons are moved axially outwardly from combustion positions disposed in closely spaced relation within the working portion of the associated cylinders defining a minimum volume condition into a respective cut-off positions thereof defining a maximum volume condition, (2) an exhaust cycle wherein said first and second outlet pistons are moved from the outlet cut-off positions thereof into the outlet end positions thereof and said first and second inlet pistons are moved through the working portions thereof into close proximity to said first and second outlet pistons respectively, (3) a transfer cycle wherein said first and second inlet and outlet pistons are moved together in close proximity to each other through the working portion thereof, (4) an intake cycle wherein said first and second outlet pistons are initially moved through the working portions of the associated cylinders while the first and second inlet pistons respectively are in positions allowing communication of the first and second inlet ports respectively with the associated working portions with the final movement of said intake cycle resulting in said first and second inlet and outlet pistons being in compression positions spaced from the respective end positions thereof so that the communication of the respective ports are cut off from the working portion of the associated cylinder, and (5) a compression cycle wherein said first and second inlet and outlet pistons are moved from said compression positions thereof toward each other respectively into said combustion positions,

the first inlet and outlet annular cams being interrelated to the second inlet and outlet annular cams such that the transfer cycle movement of each first inlet and outlet piston and an associated first inlet and outlet cam follower is accompanied by a generally equal and axially opposite transfer cycle movement of a second inlet and outlet piston and an associated second inlet and outlet cam follower so that all transfer movements of said first and second inlet and outlet pistons and the associated first and second inlet and outlet cam followers thereof are substantially axially dynamically balanced.

2. A five cycle internal combustion engine as defined in claim 1 wherein the first and second inlet and outlet cams are configured to move the associated first and second inlet and outlet pistons through two repetitive five cycle movements during each rotation of said rotor structure about the longitudinal axis of said housing assembly so that the transfer cycle movements and other cycle movements of any two diametrically opposed first or second inlet and outlet pistons take place simultaneously so as to effect axial balance and balance of the moments between adjacent cylinders about the longitudinal axis of said housing assembly.

3. A five cycle internal combustion engine as defined in claim 2 wherein there are at least two first cylinders having axes spaced equally annularly about the longitudinal axis of said housing assembly and at least two second cylinders having axes spaced equally annularly about the longitudinal axis of the housing assembly between the axes of said first cylinders.

4. A five cycle internal combustion engine as defined in claim 3 wherein the number of first cylinders is four and the number of second cylinders is four, the four first cylinders and four second cylinders having their areas disposed within inner and outer circles respectively about said longitudinal axis.

5. A five cycle internal combustion engine as defined in claim 4 wherein said first and second cylinders are generally in axially coextensive relation with respect to one another.

6. A five cycle internal combustion engine as defined in claim 5 wherein said first and second cylinders are fixed with respect to said housing assembly and said rotor assembly includes an output shaft rotatable about the longitudinal axis of said housing assembly, said first and second inlet and outlet cams being operatively fixed to said output shaft for rotation therewith.

7. A five cycle internal combustion engine as defined in claim 6 wherein each of said cam followers comprises a pair of axially spaced rollers rotatably carried by one end of an elongated piston rod fixed at an opposite end thereof to an associated piston.

8. A five cycle internal combustion engine as defined in claim 7, wherein each cam follower is guided for longitudinal rectilinear movement by a guide block fixed to the associated piston rod and slidably mounted on a pair of parallel guide rods fixed to the housing assembly.

9. A five cycle internal combustion engine as defined in claim 8 wherein in the compression positions of said first and second inlet and outlet pistons, the first and second inlet pistons are in the inlet cut-off positions thereof and said first and second outlet pistons are within the working portions of the associated first and second cylinders.

10. A five cycle internal combustion engine as defined in claim 9 wherein in the compression positions of said first and second inlet and outlet pistons, the first and second inlet and outlet pistons are in their respective cut-off positions.

11. A five cycle internal combustion engine as defined in claim 10 wherein in the compression positions of said first and second inlet and outlet pistons, the first and second inlet pistons are within the working portion of their associated first and second cylinders and said first and second outlet pistons are in the outlet cut-off position thereof.

12. A five cycle internal combustion engine as defined in claim 6 including a compression ratio adjusting system constructed and arranged to effect axial movement between said inlet and outlet annular cams so as to vary the spacing between the inlet and outlet pistons in each cylinder at the combustion positions thereof so as to vary the minimum volume condition defined thereby in relation to the volume condition defined by the compression position thereof.

13. A five cycle internal combustion engine as defined in claim 12 wherein said compression ratio adjusting system includes at least one of said first inlet and outlet cams and at least one of said second inlet and outlet cams being mounted on said rotor structure for limited longitudinal movement into a plurality of different operative positions, a first power operated cam moving assembly for effecting limited longitudinal movement of said at least one first cam into a plurality of different operative positions and a second power operated cam moving assembly for effecting limited longitudinal movement of said at least one second cam into a plurality of different operative positions, the arrangement being such that in the combustion positions of said first and second inlet and outlet pistons, they are spaced apart different distances depending upon the different operative positions of said at least one first and second cams.

14. A five cycle internal combustion engine as defined in claim 13 wherein each power operated cam moving assembly includes a pair of cooperating annular cam members having intermeshing teeth capable of being moved between a teeth meshing position and a teeth interengaging position in response to a relative angular movement therebetween and a power operated unit constructed and arranged to effect angular movements of one of said cam members, the other of said annular cam members being fixed to the associated at least one cam.

15. A five cycle internal combustion engine as defined in claim 14 wherein said power operated unit is an electric motor driving a set of speed reduction gears.

16. A five cycle internal combustion engine as defined in claim 1 wherein said first and second cylinders are generally in axially coextensive relation with one another.

17. A five cycle internal combustion engine as defined in claim 1 wherein the first and second inlet and outlet cams are configured to move the associated first and second inlet and outlet pistons through one five cycle movement during each rotation of said rotor structure about the longitudinal axis of said housing assembly so that the transfer cycle movements of any two first and second inlet and outlet pistons take place simultaneously to effect axial balance.

18. A five cycle internal combustion engine as defined in claim 1 including a compression ratio adjusting system constructed and arranged to effect axial movement between said inlet and outlet annular cams so as to vary the spacing between the inlet and outlet pistons in each cylinder at the combustion positions thereof so as to vary the minimum volume condition defined thereby in relation to the volume condition defined by the compression position thereof.

19. A five cycle internal combustion engine as defined in claim 18 wherein said compression ratio adjusting system includes at least one of said first inlet and outlet cams and at least one of said second inlet and outlet cams being mounted on said rotor structure for limited longitudinal movement into a plurality of different operative positions, a first power operated cam moving assembly for effecting limited longitudinal movement of said at least one first cam into a plurality of different operative positions and a second power operated cam moving assembly for effecting limited longitudinal movement of said at least one second cam into a plurality of different operative positions, the arrangement being such that in the combustion positions of said first and second inlet and outlet pistons, they are spaced apart different distances depending upon the different operative positions of said at least one first and second cams.

20. A five cycle internal combustion engine as defined in claim 19 wherein each power operated cam moving assembly includes a pair of cooperating annular cam members having intermeshing teeth capable of being moved between a teeth meshing position and a teeth interengaging position in response to a relative angular movement therebetween and a power operated unit constructed and arranged to effect angular movements of one of said cam members, the other of said annular cam member being fixed to the associated at least one cam.

21. A five cycle internal combustion engine as defined in claim 20 wherein said at least one first cam and said at least one second cam are also mounted for limited angular movement in addition to the limited longitudinal movement, the arrangement being such that said first and second inlet and outlet pistons remain in the same positions together during the transfer cycle movements thereof in any operative position of said at least one first and second cams.

22. A five cycle internal combustion engine comprising:

a housing assembly having a longitudinal axis,

a cylinder in said housing assembly disposed in spaced relation to said longitudinal axis,

said cylinder including an inlet end portion having an inlet port therein, a central working portion and an outlet end portion having an outlet port therein,

an inlet piston mounted in said cylinder constructed and arranged to be moved in sealing relation to said cylinder from an inlet end position wherein the inlet port thereof communicates with the working portion thereof in an axial direction away from said inlet end position into an inlet port cut-off position wherein said inlet piston cuts off communication of the inlet port thereof with the working portion thereof and beyond into the working portion thereof,

an outlet piston mounted in each cylinder constructed and arranged to be moved in sealing relation to the associated cylinder from an outlet end position wherein the outlet port thereof is communicated with the working portion thereof in an axial direction away from said outlet end position into an outlet port cut-off position wherein said outlet piston cuts off the communication of the outlet port thereof with the working portion thereof and beyond into the working portion thereof,

rotor structure within said housing assembly constructed and arranged to move with a rotational movement about said longitudinal axis,

an annular inlet cam disposed annularly about said longitudinal axis,

an inlet cam follower operatively connected between said annular inlet cam and said inlet piston so as to effect axial movements thereof in opposite directions during the rotation of the rotor structure about said longitudinal axis,

an annular outlet cam disposed annularly about said longitudinal axis, an outlet cam follower operatively connected between said annular outlet cam and said outlet piston so as to effect axial movements thereof in opposite directions during the rotation of the rotor structure about said longitudinal axis,

said inlet and outlet annular cams being configured to move the inlet and outlet pistons respectively within said cylinder through a successive five cycle repeating movement which includes (1) a power cycle wherein said inlet and outlet pistons are moved axially outwardly from combustion positions disposed in closely spaced relation within the working portion of said cylinder defining a minimum volume condition into their respective cut-off positions thereof defining a maximum volume condition, (2) an exhaust cycle wherein said outlet piston is moved from the outlet cut-off position thereof into the outlet end portion of said cylinder and said inlet piston is moved through the working portion of said cylinder into close proximity to said outlet piston, (3) a transfer cycle wherein said inlet and outlet pistons are moved together in close proximity to each other through the working portion of the associated cylinder, (4) an intake cycle wherein said outlet piston is initially moved through the working portion of said cylinder while the inlet piston is in a position allowing communication of the inlet port with the working portion of said cylinder with the final movement of said intake cycle resulting in said inlet and outlet pistons being in compression positions spaced from the respective end positions thereof so that the communication of the respective ports are cut off from the working portion of said cylinder, and (5) a compression cycle wherein said inlet and outlet pistons are moved from said compression positions thereof toward each other respectively into said combustion positions, and

a compression ratio adjusting system constructed and arranged to effect axial movement between said inlet and outlet annular cams so as to vary the spacing between the inlet and outlet pistons in said cylinder at the combustion positions thereof so as to vary the minimum volume condition defined thereby in relation to the volume condition defined by the compression position thereof.

23. A five cycle internal combustion engine as defined in claim 22 wherein said compression ratio adjusting system includes said inlet and outlet cams mounted on said rotor structure for limited longitudinal movement into a plurality of different operative positions, a first power operated cam moving assembly for effecting limited longitudinal movement of said inlet cam into a plurality of different operative positions and a second power operated cam moving assembly for effecting limited longitudinal movement of said outlet cam into a plurality of different operative positions, the arrangement being such that in the combustion positions of said inlet and outlet pistons, they are spaced apart different distances depending upon the different operative positions of said inlet and outlet cams.

24. A five cycle internal combustion engine as defined in claim 22 wherein each power operated cam moving assembly includes a pair of cooperating annular cam members having intermeshing teeth capable of being moved between a teeth meshing position and a teeth interengaging position in response to a relative angular movement therebetween and a power operated unit constructed and arranged to effect angular movements of one of said cam members, the other of said annular cam members being fixed to the associated at least one cam.

25. A five cycle internal combustion engine as defined in claim 24 wherein said power operated unit is an electric motor driving a set of speed reduction gears.

26. A five cycle internal combustion engine as defined in claim 24 wherein said inlet cam and said outlet cam are also mounted for limited angular movement in addition to the limited longitudinal movement, the arrangement being such that said inlet and outlet pistons remain in the same positions together during the transfer cycle movements thereof in any operative position of said inlet and outlet cams.

27. A five cycle internal combustion engine as defined in claim 26 wherein said inlet cam and said outlet cam are connected to said rotor structure by a helical spline connection.

28. A five cycle internal combustion engine as defined in claim 22 wherein in the compression positions of said inlet and outlet pistons, the inlet piston is in the inlet cut-off position thereof and the outlet piston is within the working portion of the associated cylinder.

29. A five cycle internal combustion engine as defined in claim 22 wherein in the compression positions of said inlet and outlet pistons, the inlet and outlet pistons are in their respective cut-off positions.

30. A five cycle internal combustion engine as defined in claim 22 wherein in the compression positions of said inlet and outlet pistons, the inlet piston is within the working portion of the cylinder and the outlet piston is in the outlet cut-off position thereof.