Systems and methods for providing partial bleeder braking engine valve actuation are disclosed. In an embodiment of the present invention, a cam may be provided with a main exhaust lobe, a partial bleeder lobe and an inner base circle portion between the two lobes. A rocker arm including an internal
Systems and methods for providing partial bleeder braking engine valve actuation are disclosed. In an embodiment of the present invention, a cam may be provided with a main exhaust lobe, a partial bleeder lobe and an inner base circle portion between the two lobes. A rocker arm including an internal rocker passage may be operatively connected to the cam. The rocker arm may contact a valve bridge at a central portion. The valve bridge may be operatively connected to first and second engine valves at its first and second ends, respectively. A slave piston incorporated into the first end of the valve bridge and a master piston may be incorporated into the central portion of the valve bridge. A hydraulic circuit may be provided between the master and slave pistons. A bleed hole may be provided above the slave piston. The master and slave pistons may be selectively actuated and the bleed hole may be selectively blocked and unblocked to provide partial bleeder braking as a result of the valve actuation motion imparted from the cam to the valve bridge through the rocker arm.
대표청구항▼
What is claimed is: 1. A system for providing partial bleeder braking engine valve actuation, comprising: a cam having a main exhaust lobe and a partial bleeder lobe extending over a majority of a circumference of the cam; a rocker arm operatively connected to the cam, said rocker arm including an
What is claimed is: 1. A system for providing partial bleeder braking engine valve actuation, comprising: a cam having a main exhaust lobe and a partial bleeder lobe extending over a majority of a circumference of the cam; a rocker arm operatively connected to the cam, said rocker arm including an internal rocker passage; a valve bridge having a central portion positioned adjacent to the rocker arm, and having first and second ends operatively connected to first and second engine valves, respectively; a slave piston incorporated into the first end of the valve bridge; and a master piston incorporated into the central portion of the valve bridge. 2. The system of claim 1 further comprising a means for biasing the rocker arm towards the valve bridge. 3. The system of claim 2 wherein the means for biasing the rocker arm comprises a spring. 4. The system of claim 3 further comprising: a valve bridge passage extending between the master piston and the slave piston, said valve bridge passage hydraulically communicating with the rocker passage; and a first check valve disposed between the master piston and the slave piston. 5. The system of claim 4, further comprising a second check valve disposed between the master piston and the slave piston. 6. The system of claim 5, further comprising: a slave piston bore provided in the first end of the valve bridge in which said slave piston is disposed; a bleed hole extending from the slave piston bore to an outer surface of the valve bridge; and a brake load screw positioned adjacent to the bleed hole. 7. The system of claim 6, further comprising a cam inner base circle portion between the main exhaust lobe and the partial bleeder lobe. 8. The system of claim 7, further comprising an elephant foot disposed between the rocker arm and the valve bridge. 9. The system of claim 8, further comprising a master piston bore provided in the central portion of the valve bridge, said master piston bore having an end wall, wherein the master piston is slidably disposed in the mater piston bore, and wherein the master piston is selectively sized to contact the master piston end wall when the rocker arm is actuated by the main exhaust lobe. 10. The system of claim 8 further comprising a means for stopping the slave piston from extending out of the slave piston bore more than a preselected distance. 11. The system of claim 1 further comprising: a valve bridge passage extending between the master piston and the slave piston, said valve bridge passage hydraulically communicating with the rocker passage; and a first check valve disposed in the valve bridge passage between the master piston and the slave piston. 12. The system of claim 11, further comprising a second check valve disposed in the valve bridge passage between the master piston and the slave piston. 13. The system of claim 1, further comprising: a slave piston bore provided in the first end of the valve bridge; a bleed hole extending from the slave piston bore to an outer surface of the valve bridge; and a brake load screw adapted to selectively block the bleed hole. 14. The system of claim 1, further comprising a cam inner base circle portion between the main exhaust lobe and the partial bleeder lobe. 15. The system of claim 1, further comprising an elephant foot disposed between the rocker arm and the valve bridge. 16. The system of claim 1, further comprising a master piston bore provided in the central portion of the valve bridge, said master piston bore having an end wall, wherein the master piston is slidably disposed in the master piston bore, and wherein the master piston is selectively sized to contact the master piston end wall when the rocker arm is actuated by the main exhaust lobe. 17. The system of claim 1, further comprising a slave piston bore provided in the first end of the valve bridge, wherein the slave piston is slidably disposed in the slave piston bore, and wherein the system further comprises a means for stopping the slave piston from extending out of the slave piston bore more than a preselected distance. 18. The system of claim 1 further comprising a means for supplying hydraulic fluid to the rocker passage. 19. A system for providing partial bleeder braking operation in an internal combustion engine, comprising: a cam including a partial bleeder braking lobe having a predetermined height over a majority of a duration of the partial bleeder braking lobe; a valve bridge operatively connected to the cam, said valve bridge having first and second ends operatively connected to first and second engine valves, respectively; a rocker arm operatively connecting the cam to the valve bridge; a slave piston slidably disposed in a slave piston bore incorporated into the first end of the valve bridge; a master piston slidably disposed in a master piston bore incorporated into the central portion of the valve bridge, the master piston fully extending and contacting an end wall of the master piston bore when the rocker arm is pivoted a distance substantially equal to the predetermined height by the partial bleeder braking lobe; a bleed hole extending from the slave piston bore to an outer surface of the valve bridge; and a means for selectively blocking the bleed hole. 20. The system of claim 19 further comprising at least one check valve disposed in a bridge passage extending between the slave piston and the master piston. 21. The system of claim 19 wherein the means for selectively blocking the bleed hole comprises a brake load screw mounted adjacent to the outer surface of the valve bridge near the bleed hole. 22. An engine valve bridge adapted for lost motion engine valve actuation, said valve bridge comprising: a cam including a partial bleeder braking lobe having a predetermined height over a majority of a duration of the partial bleeder braking lobe; a centrally located master piston disposed in a master piston bore; a slave piston disposed in a slave piston bore; a bridge passage extending between the master piston bore and the slave piston bore; and a rocker arm operatively connecting the cam to the valve bridge, wherein when the rocker arm is pivoted a distance substantially equal to the predetermined height by the partial bleeder braking lobe, the master piston is fully extended and contacts an end wall of the master piston bore; a bleed hole extending from the slave piston bore to an outer surface of the valve bridge. 23. The valve bridge of claim 22 further comprising at least one check valve disposed between the master piston and the slave piston. 24. The valve bridge of claim 22 further comprising a first check valve incorporated into the master piston and a second check valve disposed in the bridge passage.
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