Abstract: By using a small heat accumulator installed in a cooling water system, malfunction of exhaust emission during warming up is prevented. Such a cooling system includes a cooling water passage for returning cooling water flowing from a cooling water outlet of an automotive engine to a cooling water inlet through a radiator, a first bypass passage for returning the cooling water just after flowing from the cooling water outlet to the cooling water inlet through the radiator, a second bypass passage for returning the cooling water just after flowing out from the cooling water outlet of the engine to the cooling water inlet through the radiator by supplying the cooling water near a heat-sensing portion of a thermostat, a flowing amount adjusting valve for enlarging a cooling water flowing ratio to the first bypass passage with respect to the second bypass passage corresponding to a reduction of a load of the engine and the heat accumulator installed through the first bypass passage.

Abstract: A lubricating apparatus is disclosed for use in an engine having a crankshaft, at least one bearing for the crankshaft, and an oil pan for storing a lubricating oil reserve. The apparatus comprises a pump for pumping the oil up from the oil pan, an oil passage for providing fluid communication between a discharge port of the pump and the bearing to supply the oil to the bearing, and an oil recirculation passage for providing communication between the bearing and an inlet port of the pump to return the oil at the bearing to the pump. The apparatus further includes a temperature activated valve assembly along the recirculation passage. The valve assembly allows the oil to return from the bearing to the pump through the oil recirculation passage, when the temperature of the engine is below a predetermined temperature.

Abstract: A cooling apparatus for cooling an internal combustion engine having a coolant passing through the engine is provided. A heat exchanger performs a heat-energy exchange and a heat exchanger bypass passage prevents part of the coolant flowing out from the engine from flowing into the heat exchanger. A coolant combination device forms a mix of coolant which flows in a passage bypassing a thermostat with coolant which flows in a passage through the thermostat, while a flow rate ratio adjusting valve continuously adjusts the ratio of the flow rate of the part of the coolant which bypasses the thermostat to the part of the coolant which passes through the thermostat in accordance with a temperature of the coolant. Accordingly, the higher the temperature is, the larger the ratio is. Moreover, the temperature is controlled in accordance with a load of the engine so that the larger the load is, the higher the temperature is.

Abstract: An oil pan is provided with a partition member so as to be divided into a main chamber and an antechamber. A vertical wall of the partition member is provided at a lower region thereof with first holes adjacent to an opening of a draft tube of an oil pump and at an upper region thereof with second holes in the vicinity of an oil level. In a state of warming up following the starting, since the oil temperature is low and the viscosity of the oil is large, the oil in the antechamber cannot pass through the first holes. Accordingly, only the oil in the main chamber a quantity of which is small is circulated through the engine by the oil pump, thereby warming up the engine quickly. Low temperature oil in the antechamber is interchanged with the oil in the main chamber little by little through the second holes, so that the temperature thereof is raised gradually.

Abstract: A cooling system for a water cooled internal combustion engine for a vehicle includes an engine body having a water jacket therein. The system comprises a radiator and a pump chamber. The pump chamber is in communication with the water jacket. A water pump creates a flow of water into the water jacket. A first main conduit has an end connected to the water jacket at the engine outlet and another end connected to the radiator. A second main conduit has an end connected to the radiator and another end connected to the pump chamber. A reservoir tank is arranged at a position more elevated than the radiator, and a supplementation conduit connects a bottom portion of the reservoir tank with an upper part of the pump chamber. A thermostat valve is arranged between the second main conduit and the pump chamber at a position upstream from a location where the supplementation conduit is connected to the pump chamber.

Abstract: A sealed type engine cooling system having a reservoir tank connected to the engine recirculating water passageway by inlet pipes connected to the upper outlet of an engine cooling water passageway and to the upper inlet of a radiator. The bottom portion of the reservoir tank is connected to the bottom of the engine cooling water passageway, for supplementing the engine cooling water, and is provided with a cap with a relief valve, to thereby discharge vapor created in the cooling water passageway under a hot soak condition. The relationship between the inner diameter of the pipes is such that the effective cross sectional area of the inlet pipe means is 1.