Provided is an internal combustion engine component in which a satisfactory heat insulating property is combined with durability superior to that in the related art. The internal combustion engine component constitutes the inner wall surface of the combustion chamber of an internal combustion engine, wherein (1) in the component, a porous layer is formed at least on a surface exposed to the combustion chamber, and (2) the porous layer is a layer formed by three-dimensionally interconnected grains of a ferrite which is spinel type iron oxide.

An engine brake test tool includes a fitting configured to be secured within a valve opening in an engine brake system, wherein the fitting includes a first opening configured to be placed into fluid communication with a pressurized fluid source and a second opening configured to be placed into fluid communication with an oil outlet line leading to a slave piston of an engine brake system.

A durable system for controlling variable valve actuation of an engine valve corresponding to a cylinder of an automobile engine. The system includes first and second crowned cams having first and second lift profiles and a rocker arm assembly. The rocker assembly includes a first arm having an end connected to said engine valve, having a high impact roller following the first crowned cam operating the engine valves according to a first lift profile. The rocker arm assembly also includes a second arm having durable slider pads riding on the second crowned cam to operate said engine valve according to a second lift profile. A latch secures the second arm relative to the first arm when in a latched position causing the valve to operate according to a second lift profile. The valve operates according to a first lift profile when the latch is not in the latched position.

A system for selectively deactivating engine valves of a cylinder of an internal combustion engine. The system employs switching rocker assemblies between the valves of the engine and rotating cam lobes. The disclosed design is able to operate using a single cam lobe per valve. The rocker assembly employs a first arm pivotally attached to a second arm at one end. The first arm engages the valve and the second arm has a roller bearing that engages the cam lobe. A latch causes the first and second arm to move in unison following the cam surface when latched. When unlatched, the second arm follows and moves according to the rotating cam surface, but the first arm does not follow and does not actuate the valve, thereby deactivating the cylinder.

A sliding member of the present invention includes a base material and a coating layer that is formed on the base material. The coating layer includes a particle aggregate that contains precipitation hardened copper alloy particles. The precipitation hardened copper alloy particles contain cobalt (Co) and silicon (Si). The sliding member has high coating strength and superior wear resistance.

A system includes a rocker arm assembly for operative engagement with a first and second cam. The assembly includes a first arm for operatively engaging the first cam for a first desired lift profile, a second arm for operatively engaging the second cam for a second desired lift profile, where the second arm includes a latch to engage the second arm with the first arm. The latch is responsive to supplied oil pressure and release oil pressure to switch between lift profiles. The system includes the latch coupled to the supplied or released oil pressure to engage the arms before the first and second arms are engaged with the base circle portion of each of the respective first and second cams.

A switching rocker arm for engaging a cam includes a first arm having a first end and a second end, and a first and a second side arm; a second arm disposed between the first and second side arms, having a first end and a second end, where the second arm is an inner arm. The second arm is pivotably secured adjacent its first end to the first arm adjacent the first end of the first arm. The rocker arm includes an over-travel limiter that limits pivoting motion of the first arm relative to the second arm, where the over-travel limiter is pivotally coupled to the outer arm and interacts with the inner arm.

A rocker arm includes an outer arm having a first side and a second side, an inner arm positioned between the first side and the second side of the outer arm, a pivot axle pivotally coupling the inner arm and the outer arm at a first end of each of the inner arm and the outer arm, and a latch having a first position and a second position. The latch in the first position pivotally fixes the inner arm and the outer arm at a second end of each of the inner arm and the outer arm, and in the second position allows the inner arm and the outer arm to pivot independently. The latch is responsive to hydraulic pressure in a hydraulic fluid passage to selectively move to other of the first position and the second position. A lost motion spring is coupled to the inner arm.

A durable system for controlling variable valve actuation of an engine valve corresponding to a cylinder of an automobile engine. The system includes first and second crowned cams having first and second lift profiles and a rocker arm assembly. The rocker assembly includes a first arm having an end connected to said engine valve, having a high impact roller following the first crowned cam operating the engine valves according to a first lift profile. The rocker arm assembly also includes a second arm having durable slider pads riding on the second crowned cam to operate said engine valve according to a second lift profile. A latch secures the second arm relative to the first arm when in a latched position causing the valve to operate according to a second lift profile. The valve operates according to a first lift profile when the latch is not in the latched position.

A control method for stability of an intermediate phase Continuously Variable Valve Timing (CVVT) system may include comparing an oil temperature of the intermediate phase CVVT system with a predetermined value, and interrupting an operation of controlling the CVVT system when the oil temperature is lower than the predetermined value, comparing an engine RPM with a predetermined value, and interrupting the operation of controlling the CVVT system when the engine RPM is lower than the predetermined value, and comparing an operating current of the CVVT system with a predetermined management value A when the operation of controlling the CVVT system is not interrupted.