Valve system for opposed piston engines
View Patent ↗The valve system for opposed piston engines essentially comprises a single poppet valve opening into the common combustion chamber between the two opposed pistons of each piston and cylinder pair. The engine for which the mechanism is adapted includes a rotating internal cylinder surrounding each piston pair, with a stationary outer cylinder or case surrounding the rotating cylinder. The valve is pivotally attached at one side or end thereof to the edge of the valve port of the rotating cylinder, and is actuated by an arm or arms having guides (rollers, etc.) at the distal end(s) thereof, which are captured in corresponding cam track(s) or channel(s) formed in the fixed outer cylinder or case of the engine. The cam track has a variable radius, with the valve arm(s) and guide(s) alternately lifting and lowering as the guide(s) travel(s) in the variable radius cam track(s), thereby closing and opening the valve.
1. A valve system for an opposed piston engine, the engine having an engine cylinder case, a cylinder disposed within the engine cylinder case, the cylinder having an internal wall, and first and second mutually opposed pistons disposed within the cylinder, the cylinder wall and pistons defining a variable volume combustion chamber therebetween, the valve system comprising:
a poppet valve disposed within a valve port formed through the cylinder wall, the valve including a plate having a face, a back opposite the face, and a periphery;
at least one variable radius cam channel formed circumferentially within the engine cylinder case, the cam channel surrounding the cylinder;
at least one actuating arm extending generally radially outward from the back of the valve to the at least one cam channel; and
a cylinder wall attachment hinge disposed upon a portion of the periphery.
2. The valve system for an opposed piston engine according to claim 1 wherein the valve plate is curved to conform closely to the cylinder wall.
3. The valve system for an opposed piston engine according to claim 1 wherein the at least one actuating arm further includes a distal end having a cam channel follower extending therefrom.
4. The valve system for an opposed piston engine according to claim 3 , wherein the cam channel follower comprises at least one roller.
5. The valve system for an opposed piston engine according to claim 3 , wherein the cam channel follower comprises a plurality of rollers.
6. The valve system for an opposed piston engine according to claim 3 , further including a resilient connector disposed between the distal end of the actuating arm and the cam channel follower.
7. The valve system for an opposed piston engine according to claim 1 , further including:
a first actuating arm extending from the back of the valve, adjacent the periphery thereof; and
a second actuating arm extending from the back of the valve adjacent the periphery thereof opposite the first actuating arm, each of the actuating arms having a distal end and a cam channel follower extending therefrom, each of the cam channel followers being opposed to the other.
8. The valve system for an opposed piston engine according to claim 7 , wherein each of the cam channel followers comprises at least one roller.
9. The valve system for an opposed piston engine according to claim 7 , wherein each of the cam channel followers comprises a plurality of rollers.
10. The valve system for an opposed piston engine according to claim 7 , further including a resilient connector disposed between the distal end of each of the actuating arms and the corresponding cam channel followers.
11. An opposed piston engine and valve system therefor, comprising in combination:
an engine case;
at least one rotary cylinder disposed within the engine case, the cylinder having an internal wall and a valve port medially disposed therethrough, the valve port having an internal valve port wall;
mutually opposed first and second pistons reciprocatingly disposed within the cylinder, the pistons and cylinder wall defining a variable volume combustion chamber therebetween;
at least one variable radius cam channel formed circumferentially within the engine case, the cam channel surrounding the at least one rotary cylinder;
a poppet valve disposed within the valve port, the valve including a plate having a face, a back opposite the face, and a periphery;
a valve attachment hinge disposed between the periphery of the valve and the valve port wall adjacent the cylinder wall, the hinge pivotally connecting the valve to the rotary cylinder;
at least one actuating arm extending generally radially outward from the back of the valve, the actuating arm having a distal end; and
a cam channel follower extending from the distal end of the actuating arm, the follower being disposed within the cam channel, the follower following the cam channel and selectively opening and closing the valve in accordance with the variable radius of the cam channel.
12. The valve system for an opposed piston engine according to claim 11 , wherein the valve plate is curved to conform closely to the cylinder wall.
13. The valve system for an opposed piston engine according to claim 11 , wherein the cam channel follower comprises at least one roller.
14. The valve system for an opposed piston engine according to claim 11 , wherein the cam channel follower comprises a plurality of rollers.
15. The valve system for an opposed piston engine according to claim 11 , further including a resilient connector disposed between the distal end of the actuating arm and the cam channel follower.
16. The valve system for an opposed piston engine according to claim 11 , further including:
a first actuating arm extending from the back of the valve adjacent the periphery thereof; and
a second actuating arm extending from the back of the valve adjacent the sealing periphery thereof opposite the first actuating arm, each of the actuating arms having a distal end having a cam channel follower extending therefrom, each of the cam channel followers being opposed to the other.
17. The valve system for an opposed piston engine according to claim 16 , wherein each of the cam channel followers comprises at least one roller.
18. The valve system for an opposed piston engine according to claim 16 , wherein each of the cam channel followers comprises a plurality of rollers.
19. The valve system for an opposed piston engine according to claim 16 , further including a resilient connector disposed between the distal end of each of the actuating arms and the corresponding cam channel followers.
20. The valve system for an opposed piston engine according to claim 11 , further including:
an intake passage disposed through the engine case, the intake passage periodically communicating with the valve port of the rotating cylinder; and
an exhaust passage disposed through the engine case, the exhaust passage being arcuately separated from the intake passage and periodically communicating with the valve port of the rotating cylinder.