An excess sprayed coating removal device for removing excess sprayed coatings adhering to the inner surface of a crank chamber of a multi-cylinder engine includes: a rotatable nozzle inserted in a first small chamber, movable in a direction parallel to the axial direction of a cylinder bore communicating with the first small chamber, and jets high-pressure water toward the leading end side thereof; and at least a single of shields that are each inserted into a second small chamber adjacent to the first small chamber to face into a communication hole, the shields protecting from the high-pressure water a sprayed coating sprayed on the inner surface of the cylinder bore communicating with the second small chamber. The shields have a block portion in a region facing into the communication hole, the block portion configured to shut the high-pressure water jetted from the nozzle and passes through the communication hole.

A member having a sliding contact surface that exerts a reduced frictional force when making sliding contact with a prescribed member and retains the lubricating oil more uniformly is provided. The sliding contact surface is a honed surface having flat plateau parts and groove parts. As calculated in regard to the sliding contact surface by using a mean line derived from a cross-sectional curve of the sliding contact surface in accordance with ISO 13565-1, a ten-point average roughness is 0.6-7.0 m, a load length ratio at a cut level of 20% is 60-98%, an effective load roughness is 0-1 m, and a mean value of intervals between the groove parts having a depth of 0.2 m or greater from the mean line is 79-280 m.

At least one coated valve seat region has at least one first layer and a second layer, the second layer is arranged on the first layer, and the first layer and the second layer are different. The first layer and the second layer are each formed by a local thermal deposition welding method. In the case of a cylinder head of an internal combustion engine, a valve seat region is formed by depositing a first layer on a substrate material of the valve seat by a laser deposition welding method in one method step and, in a subsequent method step, depositing a second layer on the first layer by a laser deposition welding method. The second layer contains a material which exerts a material hardening effect.

The invention relates to a cylinder head cover for an internal combustion engine which has, in addition to the mere covering function, additional integrated functions, wherein the cylinder head cover according to the invention includes the following: a cover body, which, when the cylinder head cover is assembled, is mounted on an engine block of the internal combustion engine and covers a cylinder head of the internal combustion engine; a separator, through which a raw gas stream can be conducted for the purpose of cleaning, the separator being at least partially formed and/or delimited by the cover body; and/or a valve device, which is at least partially formed and/or delimited by the cover body; wherein the cylinder head cover includes a nozzle device which is integrated in the separator and/or the valve device.

A piston for an internal combustion opposed-piston engine includes a crown part, a skirt part, and an outer part. The crown part includes a first ring belt region for supporting compression rings and an end surface shaped to form a combustion chamber with an end surface of an opposing piston. The skirt part includes a sidewall and a wristpin bore with a first opening and a second opening formed in the sidewall. The outer part includes a second ring belt region for supporting oil control rings. The crown part is joined to an upper end of the sidewall with one or more welding seams. The outer part is joined to a lower end of the sidewall with a welding seam.

The object of the invention is to provide a cylinder head cover which comprises an integrated valve device and is easy to produce. To achieve this object, according to the invention the cylinder head cover comprises the following: a cover body which, when the cylinder head cover is mounted, is arranged on an engine block of the internal combustion engine and covers a cylinder head of the internal combustion engine; a valve device comprising a valve body and a main body for receiving the valve body, the main body of the valve device being secured to an inner face of the cover body by means of a weld joint.

An improved surface activation technique improves the adhesion of thermal spray coatings, which is useful for engine cylinder bores. The new method includes compressing the cylinder bore surface to create a surface profile on the surface, such as through rolling a roller along the surface. An engine block is also provided, which includes a plurality of cylinder bores, each cylinder bore having an inner surface, and each inner surface having a surface profile that includes a helical groove and other surface profiles formed in the inner surface. A thermal spray coating is formed on the inner surface of each cylinder bore, the thermal spray coating being adhered to the surface profile of the inner surface. A roller assembly for activating the surface is also provided.

Provided is a piston for an internal combustion engine, the piston enabling both an improvement in heat efficiency and a reduction in emissions, and enabling the prevention of overheating of the piston to prevent the occurrence of knocking, pre-ignition, and a drop in air filling efficiency. This piston (100a) for an internal combustion engine constitutes a portion of a combustion chamber (9) of an internal combustion engine (200) and includes a substrate (103), a first film (101) provided on a section of the top surface of the substrate (103) contacting the combustion chamber (9), and a second film (102) provided on another section of the top surface. The piston for the internal combustion engine is characterized in that: the first film (101) has a lower heat conductivity and heat capacity than the substrate (103), and the second film (102) has a lower heat conductivity than the substrate (103) and a higher heat capacity than the first film (101).

Various aspects of the present disclosure are directed to a cylinder head for an internal combustion engine. In one example embodiment, the cylinder head includes at least one spark plug having at least one earth electrode, a precombustion chamber accommodating the at least one spark plug, and a fuel channel which leads into the precombustion chamber. The fuel channel having a flow axis at an outlet that is oriented in the direction of the at least one earth electrode. An axis of rotation of the at least one spark plug has an offset with respect to the flow axis between 0 and 15% of the greatest precombustion chamber diameter.

A system includes an engine block having a plurality of cylinder-piston combinations. At least one of the cylinder-piston combinations includes a cylinder, a piston positioned in the cylinder and coupled to a connecting rod, the piston having an internal cooling gallery about a circumference of the piston, an oil jet for introducing coolant into the cooling gallery, and at least one pressure sensor positioned within the piston to detect pressure fluctuations within the cooling gallery. The system includes a processor having a program coupled thereto. The processor is configured to detect cyclical pressure fluctuations within the cooling gallery, via the at least one pressure sensor, during a linear motion of the piston within the engine block, determine pressures that occur during the detected cyclical pressure fluctuations, and determine a fill ratio of coolant within the cooling gallery based on the determined pressures.