Integrated engine brake

Abstract

An integrated engine brake assembly may include a valve that forces oil circulating through an engine to flow to an exhaust rocker arm when an engine brake lever is operated, a bridge that forms an interval with a pair of first and second exhaust valves installed on a combustion chamber, an internal oil flow path which supplies the oil flowing toward the exhaust rocker arm to the bridge through an internal space of the exhaust rocker arm, and along which the oil is supplied to the bridge and brings the bridge into contact with the pair of first and second exhaust valves under pressure, and a protrusion lifting up the exhaust rocker arm at a compression top dead center so that the pair of first and second exhaust valves are pressed and opened forcibly by the bridge, and the bridge is pressed by seesaw movement of the exhaust rocker arm.

What is claimed is: 
     
         1 . An integrated engine brake assembly, comprising:
 a valve that forces oil circulating through an engine to flow to an exhaust rocker arm when an engine brake lever is operated;   a bridge that forms an interval with a pair of first and second exhaust valves installed on a combustion chamber;   an internal oil flow path which supplies the oil flowing toward the exhaust rocker arm to the bridge through an internal space of the exhaust rocker arm, and along which the oil is supplied to the bridge and brings the bridge into contact with the pair of first and second exhaust valves under pressure; and   a protrusion that lifts up the exhaust rocker arm at a compression top dead center so that the pair of first and second exhaust valves are pressed and opened forcibly by the bridge, and the bridge is pressed by seesaw movement of the exhaust rocker arm.   
     
     
         2 . The integrated engine brake assembly of  claim 1 , wherein the internal oil flow path includes:
 an oil inlet that is formed in a shaft hole of the exhaust rocker arm and into which the oil that flows toward the exhaust rocker arm flows;   an oil flow path that is formed inside the exhaust rocker arm so that an oil flow of the oil inlet leads to an end portion of the exhaust rocker arm; and   an oil outlet that is connected to the oil flow path so that the oil flowing into the oil flow path is discharged to the bridge.   
     
     
         3 . The integrated engine brake assembly of  claim 2 , wherein the oil outlet is formed in an adjustor bolt, and the adjustor bolt is coupled to the exhaust rocker arm and comes into contact with the bridge. 
     
     
         4 . The integrated engine brake assembly of  claim 3 , wherein the oil outlet is formed in an internal space of the adjustor bolt in an axial direction, and the oil outlet communicates with the oil flow path through a circumferential hole of the adjustor bolt. 
     
     
         5 . The integrated engine brake assembly of  claim 2 , wherein the bridge includes:
 a chamber that is filled with the oil discharged from the oil outlet to form oil pressure;   a pair of first and second master pistons that are housed in the chamber to be lowered due to the oil pressure of the chamber and come into contact with the pair of first and second exhaust valves; and   a reset pin, a portion of which is exposed to an outside of the chamber and comes into contact with a reset bar so that the oil within the chamber is discharged to the outside, when the reset pin is activated.   
     
     
         6 . The integrated engine brake assembly of  claim 5 , wherein the chamber includes a plug having a plug chamber oil inlet into which the oil discharged from the oil outlet flows, and which discharges the oil to the chamber. 
     
     
         7 . The integrated engine brake assembly of  claim 5 ,
 wherein the pair of first and second master pistons are housed in the pair of first and second piston chambers in which the oil pressure is formed, and   wherein the pair of first and second piston chambers are connected to a pair of first and second oil diffusion paths which extend toward both of left and right ends of the chamber.   
     
     
         8 . The integrated engine brake assembly of  claim 1 , wherein the exhaust rocker arm further includes a bias spring, and the bias spring presses the exhaust rocker arm so that the adjustor bolt coupled to the exhaust rocker arm comes into contact with the bridge. 
     
     
         9 . The integrated engine brake assembly of  claim 1 , wherein the protrusion protrudes from an outer circumferential surface of a rotated exhaust cam. 
     
     
         10 . The integrated engine brake assembly of  claim 9 , wherein the protrusion comes into contact with an exhaust rocker arm roller, and the exhaust rocker arm roller is formed on the exhaust rocker arm.