Multifunctional engine brake

A multifunctional engine brake comprising an engine valve motion conversion mechanism, wherein the engine valve motion conversion mechanism comprises camshaft, roller, roller shaft, roller shaft housing and an axial roller drive mechanism, wherein the camshaft has two or more different cams, wherein the roller shaft housing has a roller groove, wherein the two ends of the roller shaft are installed into the roller shaft housing, wherein the middle of the roller shaft spans the roller groove, wherein the length of the roller shaft in the roller groove is longer than the axial length of the roller, wherein the roller is arranged on the roller shaft in a rotatable way, wherein the roller is also slidable along the roller shaft, the roller has two or more axial positions on the roller shaft, wherein the axial roller driving mechanism comprises a piston driving mechanism arranged in the roller shaft, wherein the piston driving mechanism in the roller shaft moves the roller from one axial position to another axial position on the roller shaft, and wherein different engine valve motions are generated by switching the links between the roller and the different cams.

The multifunctional engine brake as claimed in claim 1, wherein the two or more different cams include a conventional ignition cam and an engine brake cam, and wherein the different engine valve motions include a conventional ignition valve motion and an engine brake valve motion.

The multifunctional engine brake as claimed in claim 1, wherein the piston drive mechanism comprises a drive piston and a drive spring arranged in the roller shaft, wherein one end of the drive piston is acted by fluid, and the other end of the drive piston is acted by the drive spring, and wherein the drive piston drives the roller on the roller shaft through a connector.

The engine valve movement conversion mechanism as claimed in claim 1, wherein the camshaft is parallel to the roller shaft, wherein the roller is linked to only one of the two or more different cams at each axial position on the roller shaft, and wherein the cam generates corresponding engine valve motion.

The multifunctional engine brake as claimed in claim 1, further comprising a seating velocity control mechanism, wherein the seating velocity control mechanism is arranged between one end of the roller shaft housing and the engine valve, wherein the seating velocity control mechanism comprises a positioning mechanism and a flow limiter, and wherein the flow through the flow limiter decreases with the reduction of the valve seating distance of the engine.

The multifunctional engine brake as claimed in claim 1, further comprising a directional valve mechanism, wherein the directional valve mechanism controls the oil feeding and discharging of the axial roller drive mechanism.

The multifunctional engine brake as claimed in claim 1, further comprising an accumulator that reduces oil pressure fluctuation so that the oil is fed to the axial roller drive mechanism continuously and stably.

The multifunctional engine brake as claimed in claim 1, further comprising an oil control timing mechanism including a timing valve system that controls the timing or phase of oil feeding to or discharging from the engine brake.

An oil control timing method for driving an engine brake, comprising an oil control timing process using an oil control timing mechanism to control an oil feeding time or an oil discharging time of the engine brake, the engine brake comprises a no-timing brake oil feed valve, the oil control timing mechanism comprises a timing oil passage connecting the brake oil feed valve with a timing valve system, the timing valve system controls the timing or phase of oil filling or oil discharging of the engine brake, wherein the oil control timing process comprises the following steps:

• first, turning on the brake oil feed valve, secondly, turning on the timing valve system for a predetermined period of time or phase within the engine cycle, and finally, feeding oil to or discharging oil from the engine brake.