Claims
- 1. An engine retarding system of a gas compression release type comprising a multi-cylinder four-stroke cycle internal combustion engine having a crankshaft and a camshaft driven from said crankshaft, engine piston means associated with said crankshaft, exhaust valve means, intake valve means and fuel injector means associated with each cylinder of said engine, rocker arm means associated with each of said exhaust valve means, intake valve means and fuel injector means, pushtube means driven from said camshaft and associated with said exhaust valve means, intake valve means and fuel injector means, hydraulic fluid supply means, hydraulically actuated first piston means associated with said exhaust valve means to open said exhaust valve means, second piston means actuated by said pushtube means associated with said fuel injector means and hydraulically interconnected with said first piston means and said hydraulic fluid supply means to open said exhaust valve means during an upstroke of the engine piston associated with said exhaust valve means corresponding to its compression stroke during normal operation of the engine to produce a compression release event and to hold said exhaust valve means open during a substantial portion of the ensuing downstroke of said engine piston, said rocker arm means associated with said exhaust valves comprising a rocker member adapted to be oscillated by said exhaust valve pushtube, a latch member adapted to drive said exhaust valve means, link means interconnecting said rocker member and said latch member, adjusting screw means adapted to limit the oscillation of said link means and means biasing said latch member away from said rocker member, said exhaust valve rocker arm means adapted to disable said exhaust valve means from moving at the point it would move in the cycle during powering operation of the engine, trigger valve means hydraulically interconnected with said first and second piston means, said trigger valve means including trigger valve driving means driven by said exhaust valve pushtube means and spring means biasing said trigger valve driving means toward said exhaust valve pushtube means, said trigger valve means adapted to release the pressure on said first piston means at a pre-determined time so as to permit said exhaust valve means to partially close commencing prior to the bottom dead center position of said engine piston corresponding to its expansion stroke during powering operation, said latch member of said exhaust rocker arms means adapted to hold said exhaust valve in a partially closed position during at least the ensuing upstroke of said engine piston corresponding to its exhaust stroke during powering operation of the engine to produce a bleeder retarding event, said first piston means adapted to permit said exhaust valve to close fully during the ensuing downstroke of said engine piston corresponding to its intake stroke during powering operation of the engine whereby one compression release retarding event and one bleeder retarding event is produced in each said cylinder during each engine cycle comprising two revolutions of said crankshaft.
- 2. A rocker arm assembly for a four-stroke cycle internal combustion engine comprising a rocker member adapted to be mounted for oscillatory motion, an adjusting screw member adjustably threaded into said rocker member, at least one link member having first and second ends, said first end mounted coaxially with said rocker member, adjusting screw means adapted to adjustably limit the oscillation of said second end of said link member, a latch member having a face end and a hook end and pivotally mounted to said second end of said link member intermediate said hook end and said face end, a latch pin mounted in said rocker member for limited translational motion with respect to said rocker member, said latch pin adapted to engage said hook end of said latch member and first biasing means having first and second ends, said first end of said first biasing means adapted to engage said rocker member and said second end of said first biasing means adapted to engage said latch member intermediate said hook end of said latch member and said pivotal mounting of said latch member and said link member.
- 3. A rocker arm assembly as described in claim 2 in which said first biasing means is a compression spring.
- 4. A rocker arm assembly as described in claim 2 having a pair of link members and comprising, in addition, a pin member affixed at each end thereof to said second ends of said link members.
- 5. A rocker arm and trigger valve assembly for a four-stroke cycle internal combustion engine having a cylinder head, a housing affixed thereto and high and low pressure hydraulic circuits located in said housing comprising a rocker arm assembly adapted to be mounted on said cylinder head for oscillating motion with respect thereto, said rocker arm assembly including an adjusting screw member, a trigger valve body threaded into said housing and communicating between said high and low pressure hydraulic circuits, said trigger valve body having a passageway formed therethrough and a valve seat formed on one end thereof, a trigger valve adapted to seal against said valve seat, second biasing means biasing said trigger valve against said valve seat, a trigger driver mounted for reciprocating motion with respect to said trigger valve body, third biasing means adapted to bias said trigger driver away from said trigger body, trigger pin means having first and second ends mounted for reciprocating motion within said trigger valve body passageway and adapted to contact at said first end of said pin means said trigger driver and to contact said trigger valve at said second end of said trigger pin means.
- 6. A rocker arm and trigger valve assembly as described in claim 5 and comprising, in addition, stop means mounted on said housing adapted to limit the motion of said trigger driver in the direction in which it is biased by said third biasing means.
- 7. A rocker arm and trigger valve assembly as described in claim 5 in which said trigger pin means and said trigger driver are integral.
- 8. A rocker arm and trigger valve assembly as described in claim 5 in which said rocker arm assembly comprises a rocker member mounted on said cylinder head for oscillatory motion with respect thereto, an adjusting screw member adjustably threaded into said rocker member, at least one link member having first and second ends, said first end mounted coaxially with said rocker member, adjusting screw means threaded into said housing and adapted to adjustably limit the oscillation of said second end of said link member, a latch member having a face and a hook end and pivotally mounted to said second end of said link member intermediate said hook end and said face end, a latch pin mounted in said rocker member for limited translational motion with respect to said rocker member, said latch pin adapted to engage said hook end of said latch member and first biasing means having first and second ends, said first end of said first biasing means adapted to engage said rocker member and said second end of said first biasing means adapted to engage said latch member intermediate said hook end of said latch member and said pivotal mounting of said latch member and said link member.
- 9. A rocker arm and trigger valve assembly as described in claim 8 in which said first biasing means is a compression spring.
- 10. A rocker arm and trigger valve assembly as described in claim 8 having a pair of link members and comprising, in addition, a pin member affixed at each end thereof to said second ends of said link members.
- 11. A rocker arm and trigger valve assembly as described in claim 8 and comprising, in addition, stop means mounted on said housing and adapted to limit the motion of said trigger driver in the direction in which it is biased by said third biasing means.
- 12. A rocker arm and trigger valve assembly as described in claim 8 in which said trigger pin means and said trigger driver are integral.
- 13. A rocker arm assembly for a four-stroke cycle internal combustion engine comprising a rocker member adapted to be mounted for oscillatory motion, an adjusting screw member adjustably threaded into said rocker member, at least one link member having first and second ends, said first end pivotally mounted on said rocker member, adjusting screw means adapted to adjustably limit the oscillation of said second end of said link member with respect to said first end of said link member, a latch member having a face end and a hook end and pivotally mounted with respect to said second end of said link member and first biasing means adapted to bias said hook end of said latch member away from said rocker member.
- 14. A rocker arm assembly as described in claim 13 in which said first biasing means includes a compression spring.
- 15. A rocker arm assembly as described in claim 14 in which said first biasing means further includes a piston.
- 16. A rocker arm assembly as described in claim 13 wherein said rocker member is formed with an enlarged bore coaxial with said adjusting screw member and said adjusting screw member terminates within said bore.
- 17. A rocker arm and trigger valve assembly for a four-stroke cycle internal combustion engine having a cylinder head, a housing affixed thereto and high and low pressure hydraulic circuits located in said housing comprising a rocker arm assembly adapted to be mounted on said cylinder head for oscillating motion with respect thereto, said rocker arm assembly including an adjusting screw member, a trigger valve seat threaded into said housing and having a passageway formed therethrough which communicates between said high and low pressure hydraulic circuits, a trigger valve adapted to seal against said valve seat, second biasing means biasing said trigger valve against said valve seat a trigger valve actuating means mounted for reciprocating motion with respect to said valve seat, said biasing means mounted for reciprocating motion in said housing and located between said trigger valve means and said adjusting screw member.
- 18. A rocker arm and trigger valve assembly as described in claim 17 wherein said third biasing means comprises a telescoping piston assembly and a compression spring.
- 19. A rocker arm and trigger valve assembly as described in claim 17 wherein said rocker member is formed with an enlarged bore coaxial with said adjusting screw member and said adjusting screw terminates within said enlarged bore.
- 20. A rocker arm and trigger valve assembly as described in claim 17 in which said rocker arm assembly comprises a rocker member mounted on said cylinder head for oscillatory motion with respect thereto,, an adjusting screw member adjustably threaded into said rocker member, at least one link member having first and second ends, said first end pivotally mounted on said rocker member, adjusting screw means adapted to adjustably limit the oscillation of said second end of said link member with respect to said first en of said link member, a latch member having a face end and a hook end and pivotally mounted with respect to said second end of said link member and first biasing means adapted to bias said hook end of said latch member away from said rocker member.
- 21. A rocker arm and trigger valve assembly as described in claim 20 in which said first biasing means includes a compression spring.
- 22. A rocker arm and trigger valve assembly as described in claim 21 in which said first biasing means further includes a piston.
- 23. A rocker arm and trigger valve assembly as described in claim 20 wherein said rocker member is formed with an enlarged bore coaxial with said adjusting screw member and said adjusting screw member terminates within said enlarged bore.
- 24. An engine retarding system of a gas compression release type comprising a multi-cylinder four-stroke cycle internal combustion engine having a crankshaft and a camshaft driven from said crankshaft, engine piston means associated with said crankshaft, exhaust valve means, intake valve means and fuel injector means associated with each cylinder of said engine, rocker arm means associated with each of said exhaust valve means, in&take valve means and fuel injector means, pushtube means driven from said camshaft and associated with said exhaust valve means, intake valve means and fuel injector means, hydraulic fluid supply means, hydraulically actuated first piston means associated within said exhaust valve means to open said exhaust valve means, second piston means actuated by said pushtube means associated with said fuel injector means and hydraulically interconnected with said first piston means and said hydraulic fluid supply means to open said exhaust valve means during an upstroke o the engine piston associated with said exhaust valve means corresponding to its compression stroke during normal operation of the engine to produce a compression release event and to hold said exhaust valve means open during a substantial portion of the ensuing downstroke of said engine piston, said rocker arm means associated with said exhaust valves comprising a rocker member adapted to be oscillated by said exhaust valve pushtube, a latch member carried by said rocker member and adapted to drive said exhaust valve means, adjusting screw means adapted to limit the motion of said latch member and means biasing said latch member away from said rocker member, said exhaust valve rocker arm means adapted to disable said exhaust valve means from moving at the point it would move in the cycle during powering operation of the engine, trigger valve means hydraulically interconnected with said first and second piston means, said trigger valve means including trigger valve actuating means driven by said exhaust valve pushtube means and including spring means biasing said trigger valve driving means toward said exhaust valve pushtube means, said trigger valve means adapted to release the pressure on said first piston means at a predetermined time so as to permit said exhaust valve means to partially close commencing prior to the bottom dead center position of said engine piston corresponding to its expansion stroke during powering operation, said latch member of said exhaust rocker arm means adapted to hold said exhaust valve in a partially closed position during at least the ensuing upstroke of said engine piston corresponding to its exhaust stroke during powering opera&.ion of the engine to produce a bleeder retarding event, said first piston means adapted to permit said exhaust valve to close fully during the ensuing downstroke of said engine piston corresponding to its intake stroke during powering operation of the engine whereby one compression release retarding event and one bleeder retarding event is produced in each said cylinder during each engine cycle comprising two revolutions of said crankshaft.
- 25. A rocker arm assembly for a four-stroke cycle internal combustion engine comprising a rocker member having a lip portion adapted to be mounted for oscillatory motion, an adjusting screw member adjustably threaded into said rocker member, a latch member having a face end and a hook end carried by said rocker member and adapted to open an exhaust valve means; adjusting screw means adapted to limit the motion of said latch member and first biasing means carried by said rocker member and adapted to bias said hook end of said latch member away from said lip portion of said rocker member.
- 26. A rocker arm assembly as described in claim 25 in which said first biasing means includes a compression spring.
- 27. A rocker arm assembly as described in claim 26 in which said first biasing means further includes a piston.
- 28. A rocker arm assembly as described in claim 25 wherein said rocker member is formed with an enlarged bore coaxial with said adjusting screw member and said adjusting screw member terminates within said enlarged bore.
- 29. A rocker arm and trigger valve assembly as described in claim 17 in which said rocker arm assembly comprises a rocker member: having a lip portion adapted to be mounted for oscillatory motion on said cylinder head, an adjusting screw member adjustably threaded into said rocker member, a latch member having a face end and a hock end carried by said rocker member and adapted to open said exhaust valve means, adjusting screw means adapted to limit the motion of said latch member and first biasing means carried by said rocker member and adapted to bias said hook end of said latch member away from said lip portion of said rocker member.
- 30. A rocker arm and trigger valve assembly as described in claim 29 in which said first biasing means further includes a piston.
- 31. A rocker arm and trigger valve assembly as described in claim 29 wherein said rocker member is formed with an enlarged bore coaxial with said adjusting screw member and said adjusting screw member terminates within said enlarged bore.
BACKGROUND OF THE INVENTION
This application is a continuation-in-part of application Ser. No. 060505 filed June 4, 1987 now abandoned.
US Referenced Citations (9)
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
60505 |
Jun 1987 |
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