A system for actuating an engine valve is disclosed. The system may include a rocker arm shaft (110) having a control fluid supply passage (112) and an exhaust rocker arm (500) pivotally mounted on the rocker arm shaft (110). A cam (210) for imparting main exhaust valve actuation to the exhaust rock
A system for actuating an engine valve is disclosed. The system may include a rocker arm shaft (110) having a control fluid supply passage (112) and an exhaust rocker arm (500) pivotally mounted on the rocker arm shaft (110). A cam (210) for imparting main exhaust valve actuation to the exhaust rocker arm (500) may contact a cam roller associated with the exhaust rocker arm. A valve bridge (300) may be disposed between the exhaust rocker arm (500) and first and second engine valves (400, 450). A sliding pin (310) may be provided in the valve bridge (300), said sliding pin contacting the first engine valve (400). An engine braking rocker arm (100) may be pivotally mounted on the rocker arm shaft (110) adjacent to the exhaust rocker arm (500). The engine braking rocker arm may have a central opening, a hydraulic passage (102) connecting the central opening with a control valve (130), and a fluid passage (105) connecting the control valve with an actuator piston assembly (140). The actuator piston assembly may include an actuator piston (141) adapted to contact the sliding pin (310) during engine braking operation. A bushing (115) may be disposed between the engine braking rocker arm (100) and the rocker arm shaft (110). The bushing may have a port (118) which registers with the hydraulic passage (102). A cam (200) is provided for imparting engine braking actuation to the engine braking rocker arm (100). A plate (122) is fastened to a back end of the engine braking rocker arm (100), and a spring (124) biases the plate and the engine braking rocker arm (110) into contact with the cam (200).
대표청구항▼
1. A system for actuating an engine exhaust valve for engine braking comprising: a rocker arm shaft (110) having a control fluid supply passage (112);an engine braking rocker arm (100) pivotally mounted on the rocker arm shaft (110), said engine braking rocker arm having a central opening disposed a
1. A system for actuating an engine exhaust valve for engine braking comprising: a rocker arm shaft (110) having a control fluid supply passage (112);an engine braking rocker arm (100) pivotally mounted on the rocker arm shaft (110), said engine braking rocker arm having a central opening disposed about the rocker arm shaft (110), a hydraulic passage (102) connecting the central opening with a control valve (130), and a fluid passage (105) connecting the control valve with an actuator piston assembly (140);a valve bridge (300) extending between first and second engine exhaust valves (400, 450);a sliding pin (310) provided in the valve bridge (300), said sliding pin contacting the first engine exhaust valve (400), wherein the actuator piston assembly (140) contacts the sliding pin (310);a cam (200) for imparting engine braking actuation to the engine braking rocker arm (100); anda spring (124) biasing the engine braking rocker arm (100) into contact with the cam (200). 2. The system of claim 1, further comprising: an exhaust rocker arm (500) pivotally mounted on the rocker arm shaft (110) adjacent to the engine braking rocker arm (100); anda cam (210) for imparting main exhaust valve actuation to the exhaust rocker arm (500). 3. The system of claim 2, further comprising: a plate (122) fastened to a back end of the engine braking rocker arm (100), said plate including a central raised portion (123) which receives an end of the spring (124), a front tab (125) and two side tabs (127), said tabs (125, 127) engaging mating slots in the engine braking rocker arm (100). 4. The system of claim 3, further comprising: a bushing (115) disposed between the engine braking rocker arm (100) and the rocker arm shaft (110), said bushing having a slot (116), and a port (118) which registers with the hydraulic passage (102). 5. The system of claim 4, wherein the actuator piston assembly comprises: a slide-able actuator piston (141) disposed in a bore provided in the engine braking rocker arm, said actuator piston having a hollow interior;a lash adjustment screw (142) extending through the engine braking rocker arm (100) into the hollow interior of the actuator piston (141), said lash adjustment screw having an enlarged portion at a bottom end;a collar (143) fixed in an upper portion of the hollow interior of the actuator piston (141); anda spring (144) provided between the collar (143) and the enlarged portion of the bottom end of the lash adjustment screw (142). 6. The system of claim 5, wherein the control valve comprises: a control valve piston (131) having an internal passage (132); anda spring (133, 134) biasing the control valve piston (131) into the engine braking rocker arm (100). 7. The system of claim 6, wherein the sliding pin (310) comprises a shoulder at a mid-portion, and the valve bridge (300) comprises a bore with a mating shoulder for the sliding pin shoulder. 8. The system of claim 1, further comprising: a plate (122) fastened to a back end of the engine braking rocker arm (100), said plate including a central raised portion (123) which receives an end of the spring (124), a front tab (125) and two side tabs (127), said tabs (125, 127) engaging mating slots in the engine braking rocker arm (100). 9. The system of claim 1, further comprising: a bushing (115) disposed between the engine braking rocker arm (100) and the rocker arm shaft (110), said bushing having a slot (116), and a port (118) which registers with the hydraulic passage (102). 10. The system of claim 1, wherein the actuator piston assembly comprises: a slide-able actuator piston (141) disposed in a bore provided in the engine braking rocker arm, said actuator piston having a hollow interior;a lash adjustment screw (142) extending through the engine braking rocker arm (100) into the hollow interior of the actuator piston (141), said lash adjustment screw having an enlarged portion at a bottom end;a collar (143) fixed in an upper portion of the hollow interior of the actuator piston (141); anda spring (144) provided between the collar (143) and the enlarged portion of the bottom end of the lash adjustment screw (142). 11. The system of claim 1, wherein the control valve comprises: a control valve piston (131) having an internal passage (132); anda spring (133, 134) biasing the control valve piston (131) into the engine braking rocker arm (100). 12. The system of claim 1, wherein the sliding pin (310) comprises a shoulder at a mid-portion, and the valve bridge (300) comprises a bore with a mating shoulder for the sliding pin shoulder. 13. A system for actuating an engine valve comprising: a rocker arm shaft (110) having a control fluid supply passage (112);an exhaust rocker arm (500) pivotally mounted on the rocker arm shaft (110);a cam (210) for imparting main exhaust valve actuation to the exhaust rocker arm (500);a valve bridge (300) disposed between the exhaust rocker arm (500) and first and second engine valves (400, 450);a sliding pin (310) provided in the valve bridge (300), said sliding pin contacting the first engine valve (400);an engine braking rocker arm (100) pivotally mounted on the rocker arm shaft (110) adjacent to the exhaust rocker arm (500), said engine braking rocker arm having a central opening, a hydraulic passage (102) connecting the central opening with a control valve (130), and a fluid passage (105) connecting the control valve with an actuator piston assembly (140), wherein the actuator piston assembly includes an actuator piston (141) adapted to contact the sliding pin (310);a bushing (115) disposed between the engine braking rocker arm (100) and the rocker arm shaft (110), said bushing having a port (118) which registers with the hydraulic passage (102);a cam (200) for imparting engine braking actuation to the engine braking rocker arm (100);a plate (122) fastened to a back end of the engine braking rocker arm (100); anda spring (124) contacting the plate (122) and biasing the engine braking rocker arm (100) into contact with the cam (200).
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James N. Usko ; Bruce N. Swanbon, Apparatus and method to supply oil, and activate rocker brake for multi-cylinder retarding.
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