Abstract: A cooling structure of a water-cooled engine includes: a plurality of cylinders 2 arranged in a cylinder block 1; and a water jacket W formed around the plurality of cylinders 2. The water jacket W includes a pair of main flow paths 7, 8 formed in a state of extending in a cylinder arrangement direction outside the cylinders, and inter-bore flow paths 9, 10 formed between adjacent cylinders 2 in a state of connecting the pair of main flow paths 7, 8. Guide walls 11h, 13h, capable of guiding the cooling water flowing in the main flow paths 7, 8 to the inter-bore flow paths 9, 10, are formed in the cylinder block 1.

Abstract: An oil cooling structure of an engine is provided that is capable of enhancing cooling performance of oil while preventing an increase in number of components or an increase in required space from being involved as much as possible. In an oil cooling structure of an engine in which a transmission case is attached to one end wall of an engine body, and a transmission mechanism for an accessory drive is provided in the transmission case, the transmission case is formed into a potlid-shaped body having a plurality of rib walls along a front-rear direction, and is attached to an engine front wall with an engine cooling fan, and case inner chamber portions partitioned by the rib walls in the transmission case are configured as a transporting passage of oil circulated by an oil pump.

Abstract: A device with an adjustment bolt includes a bolt attachment wall, an adjustment bolt screwed with an internal thread hole of the bolt attachment wall, a locknut screwed with the adjustment bolt, a cover that surrounds the adjustment bolt and the locknut, and a stopper unit that prevents removal of the cover from the locknut. The stopper unit includes an inner circumference groove of the cover fitted around a C-shaped retaining ring, and an external circumference groove of the locknut fitting within the retaining ring. The external circumference groove includes a first groove portion having a large-diameter groove bottom that restricts contraction and removal of the retaining ring fitted within the inner circumference groove, and a second groove portion provided continuously for the first groove portion and having a small-diameter groove bottom that allows contraction and removal of the retaining ring fitted within the inner circumference groove.

Abstract: A piston for an engine is provided, that makes it possible to improve supply of engine oil to a recessed part thereof. The piston includes a resin coating film and a recessed part on a surface of a skirt part. In the piston, resin coating films are distributed in a patchy fashion on the surface of the skirt part. The recessed part is formed by the surface of the skirt part, between adjacent surfaces of the patchy resin coating films and by the adjacent resin coating films, forming a net-like groove. An outer-edge resin coating film, extending in a piston movement direction, is provided at the ends, in a piston circumferential direction of the skirt part.

Abstract: There is provided an engine capable of reducing oil consumption. The engine includes a cylinder head, a cylinder head cover mounted above the cylinder head, a rocker arm covered by the cylinder head cover, and a breather chamber provided inside the cylinder head cover. As a front-rear direction is defined by a longitudinal direction of the cylinder head cover, the breather chamber has a blow-by gas inlet at one side in the front-rear direction, a blow-by gas outlet at another side in the front-rear direction, and an oil discharging guide chamber at an intermediate part in the front-rear direction. The blow-by gas inlet is opened on a bottom wall of the breather chamber, and a peripheral wall of the oil discharging guide chamber is protruded downwardly from the bottom wall of the breather chamber toward between the rocker arm provided at a side of the blow-by gas outlet and the blow-by gas inlet.

Abstract: A piston for an engine includes a skirt part, and a resin coating film and a recess formed on a surface of the skirt part. A plurality of the resin coating films are discretely arranged in spots on the surface of the skirt part, and a mesh-like groove is formed by the recess provided between the resin coating films. The recess formed on the skirt part between the resin coating films adjacent to each other in a piston circumference direction is set to be adjacent to another resin coating film in a piston moving direction. An end part of the resin coating film in the piston moving direction is formed in a concave shape when seen in a piston radius direction.

Abstract: There is provided an engine lubricating device with which passage resistance of an oil strainer can be reduced and a support stay for an oil filter is unnecessary. An oil strainer includes an outer cylinder and an inner cylinder, the outer cylinder and the inner cylinder respectively have straight central axes and form inner and outer double cylinders, the outer cylinder has a strainer inlet at a lower end, the inner cylinder has a peripheral wall formed as a filter portion, the oil strainer is led out in an orientation inclined downward from the cylinder block toward an inner bottom portion of an oil pan, an upper end portion of the outer cylinder is fixed to a cylinder block, and an upper end opening portion of the inner cylinder communicates with an oil passage inlet of the cylinder block.

Abstract: It is an object of the invention to provide a multi-cylinder diesel engine in which a thermal damage of a common rail, and a rise in fuel temperature can be suppressed. In order to achieve the object, a multi-cylinder diesel engine in which, while the extension direction of a crank shaft 1 is set to the anteroposterior direction, a common rail 3 which is directed in the anteroposterior direction is placed above an intake manifold 2, and an engine cooling fan 4 is placed in front of the engine is configured so that the width direction of the engine which is perpendicular to the anteroposterior direction is set to the lateral direction, an air intake portion 6 of the intake manifold 2 is placed on the outer lateral side of the both lateral sides of the common rail 3, the outer lateral side being opposite to a head cover 5, and the common rail 3 is placed in a place to which engine cooling air produced by the engine cooling fan 4 is blown.

Abstract: It is an object of the invention to provide a multi-cylinder diesel engine in which a thermal damage of a common rail, and a rise in fuel temperature can be suppressed. In order to achieve the object, a multi-cylinder diesel engine in which, while the extension direction of a crank shaft 1 is set to the anteroposterior direction, a common rail 3 which is directed in the anteroposterior direction is placed above an intake manifold 2, and an engine cooling fan 4 is placed in front of the engine is configured so that the width direction of the engine which is perpendicular to the anteroposterior direction is set to the lateral direction, an air intake portion 6 of the intake manifold 2 is placed on the outer lateral side of the both lateral sides of the common rail 3, the outer lateral side being opposite to a head cover 5, and the common rail 3 is placed in a place to which engine cooling air produced by the engine cooling fan 4 is blown.