The present invention relates to a cooling jet nozzle (10) for an engine piston. The nozzle (10) comprises a cooling stream pathway (14), in which the internal cross-sectional dimensions of the pathway vary along the length of the pathway; and a plunger (28) located within the cooling stream pathway to impinge a cooling feedstream received within the pathway to provide a cooling jet. The plunger (28) is axially moveable within the pathway to adjust the internal cross-sectional dimensions of the cooling jet.

An oil pressure switch, which is connected in an oil path of a piston oil cooling jet to diagnose oil pressure, includes an upper body and a lower body, in which a plunger vertically moves according to oil pressure; a fixing plate that is disposed between the upper body and the lower body; a moving plate that selectively contacts a fixing plate according to movement of the plunger; a spring that generates an elastic force in a direction in which the moving plate selectively contacts the fixing plate; an output terminal that outputs an output signal according to contact between the moving plate and the fixing plate; and a parallel resistor that is electrically connected with the output terminal and electrically connected with a control resistor of a controller.

An oil pressure switch, which is connected in an oil path of a piston oil cooling jet to diagnose oil pressure, includes an upper body and a lower body, in which a plunger vertically moves according to oil pressure; a fixing plate that is disposed between the upper body and the lower body; a moving plate that selectively contacts a fixing plate according to movement of the plunger; a spring that generates an elastic force in a direction in which the moving plate selectively contacts the fixing plate; an output terminal that outputs an output signal according to contact between the moving plate and the fixing plate; and a parallel resistor that is electrically connected with the output terminal and electrically connected with a control resistor of a controller.

The invention relates to a method for operating a reciprocating piston machine, particularly an internal combustion engine, having at least one piston rod that is hydraulically adjustable in length for setting a compression ratio, wherein the piston rod comprises a piston and a hydraulic cylinder for adjusting its length, wherein the piston with the hydraulic cylinder delimits at least one working chamber, through the fill level of which at least two switching positions of the piston rod are possible, wherein independently from the setting of the compression ratio the working chamber is at least partially filled and emptied as a function of at least one first predetermined requirement to effect an at least partial exchange of a hydraulic medium in the at least one working chamber.

A control system (10) used for an engine (14) having at least one cylinder (18) is provided for a piston cooling nozzle (PCN (12)). Included in the control system (10) are a main liquid rifle (20) configured to deliver a liquid to the at least one cylinder (18) of the engine (14), and a PCN liquid rifle (22) disposed inside the main liquid rifle (20) for directing the liquid from the main liquid rifle (20) to the PCN (12). The control system (10) causes the liquid to be jetted into the at least one cylinder (18) of the engine (14) for lowering a temperature of the engine (14).

A control system (10) used for an engine (14) having at least one cylinder (18) is provided for a piston cooling nozzle (PCN (12)). Included in the control system (10) are a main liquid rifle (20) configured to deliver a liquid to the at least one cylinder (18) of the engine (14), and a PCN liquid rifle (22) disposed inside the main liquid rifle (20) for directing the liquid from the main liquid rifle (20) to the PCN (12). The control system (10) causes the liquid to be jetted into the at least one cylinder (18) of the engine (14) for lowering a temperature of the engine (14).

A top surface of the piston includes a first region. A heat shielding film is formed on the first area. The top surface further includes a second region. There is no heat shielding film formed on the second region. Instead, the second area is mirror-finished. The top surface includes a central portion. A valve recess portion is formed on an intake side of the central portion. A squish portion is formed the intake side of the valve recess portion. The first area includes at least the central portion. The second area includes at least the squish portion.

A cooling apparatus of a piston according to an exemplary embodiment of the present disclosure may include a piston configured to be formed with a cooling gallery, an inlet fluidly communicated with the cooling gallery, and an outlet fluidly communicated with the cooling gallery, therein, a first oil jet configured to inject cooling oil into the inlet, and a second oil jet configured to inject cooling oil into the outlet.

A captive screw spray nozzle comprising a screw for holding the spray nozzle on a support, the screw comprising a screw head engaging with a holding member, secured to the spray nozzle, and forming a stop for retaining the captive screw on the spray nozzle.

A captive screw spray nozzle comprising a screw for holding the spray nozzle on a support, the screw comprising a screw head engaging with a holding member, secured to the spray nozzle, and forming a stop for retaining the captive screw on the spray nozzle.