Expansible chamber engine

• US 6,619,244 B1
• Filed: 08/13/2001
• Issued: 09/16/2003
• Est. Priority Date: 08/13/2001
• Status: Expired due to Term

• Current Assignee: His Engine Systems, LLC
• Original Assignee: His Engine Systems, LLC
• Inventors: Ho, Patrick C.
• Primary Examiner(s): Argenbright, Tony M.
• Assistant Examiner(s): Harris, Katrina B.
• Application Number:
  US09/928,742
• Time in Patent Office: 764 Days
• Field of Search: 123/56.1, 123/55.2, 123/58.1, 123/46.B, 123/53.6, 123/52.1, 123/52.2, 123/52.5, 921/46
• US Class Current: 123/56.1
• CPC Class Codes: F01B 3/045 by two or more curved surfaces, e.g. for two or more pistons in one cylinder
• CPC Class Codes: F02B 75/26 Engines with cylinder axes coaxial with, or parallel or inclined to, main-shaft axis; Engines with cylinder axes arranged substantially tangentially to a circle centred on main-shaft axis
• CPC Class Codes: F02B 75/282 the pistons having equal strokes

Abstract

This engine 1 relies on a flywheel having a flywheel axis and an undulating cam surface. A piston with a roller at its base is positioned in a cylinder such that the roller abuts the undulating cam surface at some radial distance from the flywheel axis. Thus, as the piston is pushed downward by an explosion in the cylinder, it pushes against the cam surface causing the flywheel to rotate. As the flywheel continues to rotate its undulating surface pushes the piston back into position for a repetition of the cycle. More complex embodiments include one in which undulating surfaces are located on opposite faces of the same flywheel with separate pistons interacting with each face and one in which undulating surfaces are located on the facing surfaces of two separate flywheels with pistons positioned between the flywheels. In the latter embodiment, pistons can share the same cylinder.

Claims

1. An engine, including:

a rotatable flywheel having a flywheel axis and including an undulating cam surface;

an expansible chamber device including a piston having a central axis radially spaced from said flywheel axis, said piston abutting said cam surface and movable in a cycle between retracted and extended positions;

said cycle including a power stroke from said retracted position to said extended position to urge said piston against said cam surface to thereby rotate said flywheel, and a compression stroke from said extended position to said retracted position in response to said cam surface.

7. An engine as defined in claim 1, wherein said cam surface is configured to control at least one engine parameter, including at least one of a compression ratio, a duration of intake stroke, a duration of exhaust stroke, a duration of combustion stroke, a duration of power stroke, a compression stroke pattern, a volumetric efficiency, and a power stroke pattern.

11. An engine as defined in claim 1, wherein the expansible chamber device is radially moveable relative to said flywheel axis.

15. An engine as defined in claim 1, wherein the central axis is angled with respect to said flywheel axis so as to cause the piston to exert more force on the cam surface during a power stroke.

2. An engine, including:

a rotatable flywheel having a flywheel axis and including first and second undulating cam surfaces on opposite faces thereof;

a first expansible chamber device including a piston having a central axis radially spaced from said flywheel axis, said piston abutting said first cam surface and movable in a cycle between retracted and extended positions;

a second expansible chamber device including a piston having a central axis radially spaced from said flywheel axis, said piston abutting said second cam surface and movable in a cycle between retracted and extended positions;

said cycle including a power stroke from said retracted position to said extended position to urge said piston against said cam surface to thereby rotate said flywheel, and a compression stroke from said extended position to said retracted position in response to said cam surface.

8. An engine as defined in claim 2, wherein at least one of said cam surfaces is configured to control at least one engine parameter, including at least one of a compression ratio, a duration of intake stroke, a duration of exhaust stroke, a duration of combustion stroke, a duration of power stroke, a compression stroke pattern, a volumetric efficiency, and a power stroke pattern.

12. An engine as defined in claim 2, wherein an expansible chamber device is radially moveable relative to said flywheel axis.

16. An engine as defined in claim 2, wherein a central axis is angled with respect to said flywheel axis so as to cause a piston to exert more force on a cam surface during a power stroke.

3. An engine, including:

first and second coaxial and axially spaced flywheels operatively connected to a coaxial output shaft and including respectively first and second undulating cam surfaces facing each other; and

an expansible chamber device disposed between said flywheels and radially offset relative to said output shaft, said expansible chamber device including first and second opposed pistons movable in a cylinder between retracted and extended positions, said pistons adapted for engagement with respectively said first and second cam surfaces;

said pistons operating in cycles including power strokes from said retracted positions to said extended positions to urge said pistons against respective cam surfaces to thereby rotate corresponding flywheels, and compression strokes from said extended positions to said retracted positions in response to said cam surfaces.

4. An engine as defined in claim 3, wherein one of said flywheels is directly connected to said output shaft for rotation therewith, and the other of said flywheels is operatively connected to said output shaft for rotation in the opposite direction of rotation.

9. An engine as defined in claim 3, wherein at least one of said cam surfaces is configured to control at least one engine parameter, including at least one of a compression ratio, a duration of intake stroke, a duration of exhaust stroke, a duration of combustion stroke, a duration of power stroke, a compression stroke pattern, a volumetric efficiency, and a power stroke pattern.

13. An engine as defined in claim 3, wherein an expansible chamber device is radially moveable relative to the axis of said output shaft.

17. An engine as defined in claim 3, wherein a central axis of an expansible chamber device is angled with respect to said flywheel axis so as to cause a piston to exert more force on a cam surface during a power stroke.

5. An engine, including:

first and second coaxial and axially spaced flywheels operatively connected to a coaxial output shaft and respectively including first and second undulating cam surfaces facing each other; and

an expansible chamber device disposed between said flywheels and radially offset relative to said output shaft, said expansible chamber device including a stationary cylinder with air inlet, fuel inlet, and exhaust ports, and first and second opposed pistons movable in said cylinder in opposite directions between retracted positions and extended positions, said pistons each including on the outboard end thereof a cam roller for engagement with a corresponding one of said cam surfaces;

said pistons operating in cycles including power strokes from said retracted positions to said extended positions, and compression strokes from said extended positions to said retracted positions;

said power strokes urging said cam rollers of said first and second pistons against respectively said first and second cam surfaces to thereby rotate said first and second flywheels;

said compression strokes responsive to action of said first and second cam surfaces against said cam rollers of respectively said first and second pistons to move said pistons to said retracted positions.

6. An engine as defined in claim 5, wherein one of said flywheels is directly connected to said output shaft for rotation therewith, and the other of said flywheels is operatively connected to said output shaft for rotation in the opposite direction of rotation.

10. An engine as defined in claim 5, wherein at least one of said cam surfaces is configured to control at least one engine parameter, including at least one of a compression ratio, a duration of intake stroke, a duration of exhaust stroke, a duration of combustion stroke, a duration of power stroke, a compression stroke pattern, a volumetric efficiency, and a power stroke pattern.

14. An engine as defined in claim 5, wherein an expansible chamber device is radially moveable relative to the axis of said output shaft.

18. An engine as defined in claim 5, wherein a central axis of an expansible chamber device is angled with respect to said flywheel axis so as to cause a piston to exert more force on a cam surface during a power stroke.