Abstract: A cooling system of an internal combustion engine has a plurality of cylinder coolant passages. Each of the passages is provided for one of a plurality of cylinders. The plurality of cylinder coolant passages has grooves provided on outer surfaces of cylinder liners of the plurality of cylinders. The system also includes a cylinder head coolant passage located so as to extend in a cylinder head and a coolant supply for supplying coolant to the cylinder head coolant passage. The cylinder head coolant passage has branch passages connected therewith, each of the branch passages being also connected with respective one of the plurality of cylinder coolant passages.

Abstract: A cooling system for an internal combustion engine able to realize a cooling effect matching a distribution of incoming heat of a cylinder liner. A plurality of annular grooves are formed on an outer surface of the cylinder liner, and a passage connecting the annular grooves is also provided. An introducing passage part is formed between an inlet passage of a coolant and the uppermost annular groove. A curved portion is provided to the introducing passage part. A flow direction of the coolant flowing into the introducing passage part is smoothly changed so as to flow along a direction of a passage connecting the annular grooves. An amount of coolant flowing into the annular grooves located lower than the uppermost annular groove is increased appropriately.

Abstract: A cooling system of a cylinder liner of an internal combustion engine includes a plurality of first passages formed on an outer surface of the cylinder liner of the internal combustion engine and spaced apart from each other. A second passage is formed on the outer surface of the cylinder liner and runs in an axial direction of the cylinder liner, coupling the first passages to each other. The second passage receives, via an inflow part thereof, a coolant supplied in a traverse direction substantially perpendicular to the axial direction. A third passage is formed on the outer surface of the cylinder liner, and runs in the axial direction of the cylinder liner, coupling the first passages to each other. The third passage outputs the coolant received from the first passages to an outflow part thereof. The second passage has a traverse-sectional area which decreases as a distance of the traverse-sectional area from the inflow part increases.

Abstract: A cooling system of an internal combustion engine has a plurality of coolant passages located in a row along a longitudinal axial direction of a cylinder liner. Each of the plurality of coolant passages is located so as to extend approximately along a circumference of the cylinder liner. The plurality of coolant passages are located between an inner wall of a cylinder block and an outer wall of the cylinder liner. The cylinder liner is fitted in the cylinder block. The cooling system also has an inflow passage through which coolant flows into the plurality of coolant passages. The cooling system also contains a flux passage through which coolant flows out of the plurality of coolant passages.

Abstract: A cooling system for an internal combustion engine eliminate stagnation of a coolant flowing in a plurality of annular passages formed between a cylinder block and a cylinder liner along a circumference of an outer surface of the cylinder linear. Inflow and outflow passages, connected to the annular passages, are provided extending in a direction of an axis of the cylinder liner. An inlet passage, supplying a coolant to the inflow passage, is provided. A guiding member is provided at an entrance of each of the annular passages so as to lead a portion of a coolant to an upstream side of each of the annular passages. Sufficient amount of coolant flows through the annular passages of the cylinder linear, and thus the wall of the cylinder liner can be cooled efficiently.

Abstract: The degree of opening of the choke valve in a carburetor for an internal combustion engine is controlled in accordance with the temperature of at least one predetermined position of temperature adjustment devices in the air intake manifold portion of the engine, whereby emission of harmful exhaust gas is reduced and the rated fuel consumption of the engine is maintained.

Abstract: Disclosed is an internal combustion engine comprising a catalytic converter containing a three way catalyzer therein. A secondary air feed control device, an air-fuel ratio detector and the catalytic converter are arranged in this order in the exhaust passage of the engine. An exhaust gas mixing device is disposed in the exhaust passage between the air-fuel ratio detector and the catalytic converter so as to make a total air-fuel ratio in the inlet of the catalytic converter equal to the stoichiometric air-fuel ratio at all times.