| 摘要 |
An apparatus for improving performance of an engine brake by changing an opening and shutting period of an exhaust valve is provided to discharge kinetic energy of a cylinder in an engine to the air by converting the kinetic energy into thermal energy through varying a phase of a cam shaft with respect to an exhaust valve timing belt gear. An apparatus for improving performance of an engine brake by changing an opening and shutting period of an exhaust valve comprises an exhaust valve timing belt gear(10), a cam shaft(20) and a phase changing member(30). The cam shaft is connected with a cam to operate the cam. The phase changing member is provided between the exhaust valve timing belt gear and the cam shaft to change the phase of the cam shaft with respect to the exhaust valve timing belt gear. A helical gear(12) is formed in an inner side of the exhaust valve timing belt gear. A spur gear(22) is formed in an outer side of the cam shaft. The helical is formed in an inner side of the phase changing member and the spur gear is formed in an outer side of the phase changing member. |
