Engine brake having an articulated rocker arm and a rocker shaft mounted housing
View Patent ↗A system for actuating an engine valve is disclosed. The system may include a lost motion housing having two spaced collars surrounding a rocker shaft. The lost motion housing may include an internal hydraulic circuit connecting a master piston bore with a slave piston bore. The lost motion housing may include a means for securing the lost motion housing in a fixed position relative to the rocker shaft. A master piston may be disposed in the master piston bore and a slave piston may be disposed in the slave piston bore. A rocker arm may be disposed on the rocker shaft between the spaced collars and may have a first portion adapted to contact a cam and a second portion adapted to contact the master piston. In a preferred embodiment, the system may be used to provide compression release engine braking or bleeder engine braking.
1. A system for actuating an engine valve comprising:
a rocker shaft;
a lost motion housing having a collar surrounding the rocker shaft, and having an internal hydraulic circuit connecting a master piston bore with a slave piston bore;
means for securing the lost motion housing in a fixed position relative to the rocker shaft;
a master piston disposed in the master piston bore;
a slave piston disposed in the slave piston bore; and
a rocker arm disposed on the rocker shaft, said rocker arm having a first portion adapted to contact a cam and a second portion adapted to contact the master piston.
2. The system of claim 1 further comprising a hydraulic passage extending through the rocker shaft and in communication with internal hydraulic circuit in the lost motion housing.
3. The system of claim 1 wherein the lost motion housing has two collars surrounding the rocker shaft.
4. The system of claim 3 wherein the rocker arm is disposed between the two collars.
5. The system of claim 4 further comprising:
a control valve bore provided in the lost motion housing, said control valve bore communicating with the internal hydraulic circuit; and
a control valve disposed in the control valve bore.
6. The system of claim 5 further comprising a check valve disposed in the control valve.
7. The system of claim 6 further comprising a means for biasing the rocker arm towards the master piston.
8. The system of claim 6 further comprising a means for biasing the rocker arm towards the cam.
9. The system of claim 6 wherein the means for securing the lost motion housing comprises a boss extending from said lost motion housing collar and a bolt extending from said boss into an engine component.
10. The system of claim 6 wherein the master piston bore is oriented obliquely relative to the slave piston bore.
11. The system of claim 6 further comprising a cam having a compression release engine braking lobe adapted to contact the first portion of the rocker arm.
12. The system of claim 6 further comprising a cam having a lobe selected from the group consisting of: a bleeder braking lobe or a partial bleeder braking lobe, wherein said lobe is adapted to contact the first portion of the rocker arm.
13. The system of claim 1 further comprising:
a control valve bore provided in the lost motion housing, said control valve bore communicating with the internal hydraulic circuit; and
a control valve disposed in the control valve bore.
14. The system of claim 13 further comprising a check valve disposed in the control valve.
15. The system of claim 1 further comprising a means for biasing the rocker arm towards the master piston.
16. The system of claim 1 further comprising a means for biasing the rocker arm towards the cam.
17. The system of claim 1 wherein the means for securing the lost motion housing comprises a boss extending from said lost motion housing collar and a bolt extending from said boss into an engine component.
18. The system of claim 1 wherein the master piston bore is oriented obliquely relative to the slave piston bore.
19. The system of claim 1 further comprising a cam having a compression release engine braking lobe adapted to contact the first portion of the rocker arm.
20. The system of claim 1 further comprising a cam having a lobe selected from the group consisting of: a bleeder braking lobe or a partial bleeder braking lobe, wherein said lobe is adapted to contact the first portion of the rocker arm.
21. The system of claim 19 wherein the cam further comprises a brake gas recirculation lobe adapted to contact the first portion of the rocker arm.