There is provided a cylinder device having optimal arrangement of fine textures and optimal surface roughness capable of reducing wear of a cylinder bore side and a piston ring by processing fine textures in an optimal selection region of the cylinder bore side to improve lubrication characteristics between the piston ring and the cylinder bore side while reducing engine oil consumption by processing surface roughness of the cylinder bore side to an optimal status.

A cylinder liner for insertion into an aluminum internal-combustion engine block may include a cylindrical body of cast iron having a circumferential external surface. The cylinder liner may also have a coating deposited on and surrounding the external surface. The external surface may have a specific roughness, and the coating may include at least 98% by volume of pure nickel, and a remainder composed of impurities.

An engine having a water jacket may include a cylinder block where cylinder liners in which pistons are disposed are arranged in a length direction, a first water jacket being provided to surround the cylinder liners, and a second water jacket provided in the length direction at an exhaust side, separately from the first water jacket, and a cylinder head disposed above the cylinder block, and including a head water jacket provided therein along a length direction thereof, wherein an exhaust side of the head water jacket receives coolant from the second water jacket through connection paths.

A sprayed coating for a sliding member of the present invention includes a ferrous alloy containing iron (Fe) as a major ingredient.

The sprayed coating for the sliding member containing 10 mass % or more and 20 mass % or less of chromium (Cr), and 0.1 mass % or more and 0.5 mass % or less of silicon (Si) and having the content rate of an oxide in the sprayed coating of 1 area % or less has corrosion resistance with improved seizure resistance.

A sprayed coating for a sliding member of the present invention includes a ferrous alloy containing chromium (Cr).

The sprayed coating for the sliding member has the content rate of the chromium of 8 mass % or more, includes a structure that comprises crystal grains contained in the sprayed coating and having an average grain size of 3 μm or less, has a Vickers hardness of 300 Hv or more, and then is excellent at abrasion resistance.

A method for producing an internal combustion engine, includes the steps of providing a cylinder comprising a cylinder wall, wherein a surface of the cylinder wall has a structure which is designed and formed such that it can be penetrated by a coating; generating at least one barrier region by way of at least regional machining of the structure such that the coating cannot penetrate into the structure; and applying a coating to the cylinder wall, which coating does not penetrate into the structure in the at least one barrier region.

A method for producing an internal combustion engine, includes the steps of providing a cylinder comprising a cylinder wall, wherein a surface of the cylinder wall has a structure which is designed and formed such that it can be penetrated by a coating; generating at least one barrier region by way of at least regional machining of the structure such that the coating cannot penetrate into the structure; and applying a coating to the cylinder wall, which coating does not penetrate into the structure in the at least one barrier region.

Provided is an engine, including: a cylinder including a cylinder liner; a piston provided inside the cylinder liner; a piston ring provided on the piston; a contact detector configured to detect a contact between a step formed in an inner peripheral surface of the cylinder liner and the piston ring; and a compression ratio controller configured to control a top dead center position of the piston so that the piston ring at the top dead center position is located on a combustion chamber side with respect to the step when the contact is detected.

A coating liquid for preparing a needle-shaped cylinder liner, comprising the following components: 0.05-0.4 parts of an anionic surfactant; 0.05-0.5 parts of tannic acid; 0.15-0.7 parts of caustic soda; 22-38 parts of diatomite; 3-10 parts of montmorillonite; and 62-75 parts of water. A method for preparing a needle-shaped cylinder liner comprises spraying a coating liquid for preparing the needle-shaped cylinder liner onto the inner wall of a hollow cylindrical mould, and drying the coating liquid to obtain a mould with a coating attached to the surface of the inner wall; adding an inoculated iron liquid into the rotary mould, and cooling and demoulding to obtain a cylinder liner blank; and subjecting the blank to outer surface cleaning and forming machining to obtain the needle-shaped cylinder liner.

A piston of a cylinder of an internal combustion engine includes: an upper piston crown; a radially outer surface; a plurality grooves arranged on the radially outer surface; and a plurality of piston rings each positioned in a respective one of the grooves. The radially outer surface forms a top land arranged between the upper piston crown and an uppermost one of the grooves of the piston, and the top land has an axial length and a non-abrasion-proof coating.