A manufacturing method of a heat shield component includes a mixing step of mixing sol including a ceramic precursor with heat-expandable microspheres having an outer shell formed of thermoplastic resin and encapsulating a foaming agent so as to obtain a mixed solution, a coating step of applying the mixed solution to a substrate to obtain a coated product, and a heating step of heating the coated product to form a base body including a ceramic from the ceramic precursor, and leading the heat-expandable microspheres to foam so as to form a ceramic porous layer including closed pores in the base body. The ceramic porous layer has a porosity in a range of 40% to 70%.

An outboard motor catalytic converter that can downsize an outboard motor by making a space, where catalysts are installed, small and can ensure efficient reaction of the catalysts. The outboard motor catalytic converter includes exhaust pipes that are connected to exhaust manifolds of an engine of the outboard motor. Catalysts are installed inside the exhaust pipes, and at least a portion of each of the exhaust pipes, which corresponds to a place where the catalysts are installed, is formed to have a double structure constituted of an inner pipe and an outer pipe.

A thermal barrier coating for an internal combustion engine includes an insulating thermal spray coating, where a chosen material of the insulating thermal spray coating has a thermal conductivity lower than 2 W/mK in fully dense form and the chosen material includes a coefficient of thermal expansion within 5 ppm/K of a coefficient of thermal expansion of a material of a component of the internal combustion engine upon which the coating is placed.

A thermal barrier coating for an internal combustion engine includes an insulating thermal spray coating, where a chosen material of the insulating thermal spray coating has a thermal conductivity lower than 2 W/mK in fully dense form and the chosen material includes a coefficient of thermal expansion within 5 ppm/K of a coefficient of thermal expansion of a material of a component of the internal combustion engine upon which the coating is placed.

A vehicle front structure includes, below a bonnet (6), a cover member (1) that covers an engine from an upper portion thereof to the side and is formed by an upper wall (30), a shroud (8) as a front wall, a rear wall (13), and side walls (11, 12) on the respective left and right sides. The cover member is formed by the upper wall, the front wall, the rear wall, and the side walls on the respective left and right sides. The front side of one of the left and right side walls is configured to have, relative to the rear side, a higher ratio of a low-rigidity member having lower rigidity than a high-rigidity member forming a main portion on the rear side.

There is provided a blowby gas atmosphere releasing device 20 for an engine 1 in which an intake flow path 3 is disposed at one side of an engine body 2 and an exhaust flow path 4 is disposed at the other side. The blowby gas atmosphere releasing device 20 includes an oil separator 22 that is connected to the engine body 2 and separates oil contained in blowby gas, and an atmosphere releasing pipe 23 that is connected to the oil separator 22 and is used to release the blowby gas to the atmosphere. The atmosphere releasing pipe 23 is disposed along the other side of the engine body 2.

A gear motor includes a gear mechanism driven via a clutch by an electric motor. The clutch is at least partially enclosed by a protective part, and the protective part includes two cowl parts. The cowl parts are connected to one another and each cowl part includes grill openings, e.g., on their side facing toward the electric motor.

A vehicle comprising: an engine comprising two banks of cylinders having axial directions angled relative to each other to form a region running between the axial directions of the two banks; a plurality of exhaust components located in the region; and a heat shield enclosing the exhaust components between the engine and the heat shield, the heat shield comprising an inner surface facing the exhaust components, a first heat shield inlet and a heat shield outlet, and the heat shield being configured to channel an airflow between the first heat shield inlet and the heat shield outlet over the inner surface of the heat shield.

A thermal barrier coating for an internal combustion engine includes an insulating thermal spray coating, where a chosen material of the insulating thermal spray coating has a thermal conductivity lower than 2 W/mK in fully dense form and the chosen material includes a coefficient of thermal expansion within 5 ppm/K of a coefficient of thermal expansion of a material of a component of the internal combustion engine upon which the coating is placed.

A thermal barrier coating for an internal combustion engine includes an insulating thermal spray coating, where a chosen material of the insulating thermal spray coating has a thermal conductivity lower than 2 W/mK in fully dense form and the chosen material includes a coefficient of thermal expansion within 5 ppm/K of a coefficient of thermal expansion of a material of a component of the internal combustion engine upon which the coating is placed.