Four cycle engine with two cycle compression braking system

A compression braking system for a four cycle engine having a low pressure oil supply, an oil reservoir, and a plurality of cylinders, each of said cylinders having first and second normally closed engine inlet valves, first and second normally closed engine exhaust valves, an inlet bridge extending between the inlet valves and adjacent an associated inlet rocker arm, an exhaust bridge extending between the engine exhaust valves and adjacent an associated exhaust rocker arm, a cam system associated with each inlet and exhaust rocker arm for controllably moving the rocker arm and the associated valves to an open position, and an electronically controlled fuel injector unit and an associated cam actuated fuel injection rocker arm system, comprising:

• a bridge connector having first and second ends and being fixedly connected at a respective end to the inlet bridge and the exhaust bridge, said inlet and exhaust bridges being of a construction sufficient for rocking motion of the inlet and exhaust bridges relative to their associated inlet and exhaust valves;
• an on/off brake controlling system connectable to the low pressure oil supply;
• a piston positioned between the bridge connecter, in the associated unit injector rocker arm, connected to the unit injector outlet and adapted for controllably pressurizing said piston, contacting said bridge connecter and moving said bridge connector and one engine inlet valve and one engine exhaust valve to an open position in response to movement of the unit injector piston by the unit injector rocker arm;
• a check valve positioned between the brake controlling system and the piston;
• said exhaust rocker arm having first and second rocker arm portions pivotally moveable relative to one another and a pair of over-center holding links pivotally connected one to the other and pivotally connected at opposed ends to a respective exhaust rocker arm portion;
• said cam of said fuel injection rocker arm having two actuating lobes positioned about 180 degrees apart;
• a spring connected to the first rocker arm portion and being positioned adjacent the first link, in forcible contact therewith, and maintaining the links in an actuatable first position;
• and
• a second piston having one end connected to one of the exhaust rocker arm portions and the other second piston end positioned adjacent the pivotal connection of the links one to the other, said second piston being hydraulically connected in fluid communication said brake controller 41, said exhaust rocker arm being normally maintained in the first actuatable position via said spring and pair of links and being maintained in a second deactivated position via said extended second piston, pair of links, and pressurized controlling system.