JPH036327B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a suction cooling method for internal combustion engines.

(Prior art) The cooling method used in conventional internal combustion engines is heat exchange with air, and there are various methods for this, such as natural cooling methods mainly using air cooling and liquid cooling, and forced cooling methods. However, with the natural cooling method, the limit of the cooling effect is low and the effect is slow to appear, and with the forced cooling method, there is no need to worry about this, but it has the disadvantage that it consumes the engine output and ends up becoming a load on the engine. Ta.

In order to solve this problem, the present inventor has developed an invention that utilizes the exhaust gas flow in the muffler to generate negative pressure to promote cooling, and has already filed an application for the invention. However, in that invention, a negative pressure generating section is provided in the muffling device and a single section to be cooled is cooled, and it is not possible to cope with the case where a plurality of sections that require cooling are simultaneously cooled. The present invention solves this problem.

(Technical Problem) An object of the present invention is to provide a suitable number of parts that generate suction force due to negative pressure at suitable locations in the exhaust pipe system, and to connect the parts to auxiliary equipment or the main body of the internal combustion engine that require cooling, respectively. It is an object of the present invention to provide a suction cooling method that can effectively perform cooling by connecting through an independent ventilation pipe.

(Technical means) The purpose is to accelerate the flow path by providing a part in the exhaust pipe system for discharging the gas flow discharged from the combustion chamber of an internal combustion engine to narrow the cross-sectional area of the flow path. A negative pressure flow is generated by acceleration, and air flow from outside the system is introduced into the negative pressure section from at least one suction port, and auxiliary equipment or internal combustion engine main body and two or more other locations that require cooling. By connecting the cooled part and the suction port with the ventilation means, air is sucked into the exhaust pipe system from the auxiliary equipment or the internal combustion engine side through the ventilation means, and the auxiliary equipment or the internal combustion engine body is forcibly This is achieved by air cooling.

Here, auxiliary equipment refers to those necessary for the operation of the internal combustion engine, such as oil coolers, intercoolers, radiators, turbo superchargers, catalysts, etc., excluding the main body, and the term main body refers to the whole or each part. It also includes parts that form part of the main body, such as the oil pan.

(Example) The present invention will be explained below using illustrated embodiments.

FIG. 1 schematically shows an apparatus for carrying out the cooling method according to the present invention, in which 1 is an exhaust pipe system of an internal combustion engine E, 2 and 3 are two suction ports connected in series to the exhaust pipe system 1. It is provided over several stages and communicates with auxiliary machinery or the main body of the internal combustion engine E through pipes 11, 12, 13, and 14, which are ventilation means. 21 is the oil cooler,
22 is a turbo supercharger, and 23 is a catalyst, which are so-called auxiliary equipment in the present invention.The oil cooler 21 is provided with an intake port 31 for taking in outside air, and heat exchange is also performed with the outside air. It can also cool intercoolers, radiators, etc. as auxiliary equipment.
The main body, oil pan, etc. are also subject to cooling.

In this embodiment, when exhaust gas is discharged into the exhaust pipe system due to the operation of the internal combustion engine E, a negative pressure is generated at the suction ports 2 and 3, thereby causing the ventilation pipes 11 to 14 to
Since a flow is generated from the auxiliary equipment toward the suction ports 2 and 3, the cooling effect on the oil cooler 21 is promoted, and the exhaust gas flow passing through the catalyst is accelerated by the air sucked and discharged from the suction port 2 into the exhaust pipe system 1. temperature can be lowered and the durability of the catalyst can be improved.

In the embodiment shown in FIG. 2, two stages of suction ports 51 and 52 are set up downstream of a silencer 40, and these are connected to the above-mentioned supplements through pipes 61, 62, 63, and 64, which are ventilation means. Contacting the main body of the aircraft or internal combustion engine. In the figure, 41 is the connection port to the tail tube 1 which is the exhaust pipe system, 42 is the first acceleration part with a narrowed flow path diameter, 43 and 44 are the double silencer tubes installed concentrically downstream of the first acceleration part, and 45 is the connection port to the tail tube 1 which is the exhaust pipe system. an airtight cylinder surrounding them, 4
Reference numeral 6 denotes a heat insulating protection cylinder, 47 a communication path that communicates between the external silencing chamber 48 and the inside of the rear aperture cone 49, and 55 a second accelerating section having a rectification accelerating cone 56 provided at the rear end of the silencing section 50, which connects the suction port. 51 and 52 are connected by a conduit whose diameter gradually increases. As a result, the exhaust gas flow at points A and B after the muffler can be accelerated, and the diameter of the downstream pipe has been increased.
The resistance was reduced, and the airflow from the ventilation pipes 61 became smoothly introduced.

(Function) Since the present invention is configured as described above, when the internal combustion engine starts operating and exhaust gas flows into the exhaust pipe system 1, the high-speed gas flow generates negative pressure at the suction port, and the exhaust gas flows into the exhaust pipe system 1. Pipe lines 11 to 14, 6 as ventilation means
The air flow is vacuum-sucked from auxiliary equipment such as the oil cooler 21 or the main body of the internal combustion engine, which are connected through the air pumps 1 to 64. As a result, the amount of air that passes through the auxiliary equipment for cooling increases, and the cooling effect is promoted, so if the internal combustion engine incorporating the present invention is running, the vehicle equipped with it will stop. It has the characteristic that a certain cooling effect can be obtained even when the temperature is low. In addition, when applied to a car, etc., when airflow is introduced into the exhaust pipe system due to high-speed movement, the exhaust gas is forcibly sucked in, reducing the gas pressure in the exhaust pipe system, resulting in a decrease in exhaust side pressure. Due to the negative pressure difference, the air-fuel mixture intake speed into the cylinder is increased, the combustion speed is improved, and the output is increased.

(Effects) Therefore, according to the present invention, there is an effect that the cooling effect can be improved without consuming engine output, and in particular, the cooling system including the suction port, ventilation pipe, auxiliary equipment, etc. Since several units can be installed, it is possible to centrally cool one or two areas, such as an oil cooler or radiator, or evenly cool many areas that require cooling.The effect is not natural heat dissipation. Since it is forced, the cooling effect appears quickly.

[Brief explanation of the drawing]

The drawings show an embodiment of the suction cooling method according to the present invention, and FIG. 1 is a schematic explanatory diagram of the first embodiment;
FIG. 2 is a longitudinal sectional view of the second embodiment. 1... Exhaust pipe system, 2, 3, 51, 52... Suction port, 11, 12, 13, 14, 61, 62, 6
3, 64...Pipe line serving as ventilation means, 21...Oil cooler, 22...Turbo super charger,
23...catalyst, 40...silencer.

Claims (1)

[Claims] 1. The exhaust pipe system for discharging the gas flow discharged from the combustion chamber of an internal combustion engine is provided with a part that narrows the cross-sectional area of the flow path to accelerate the flow velocity and create a negative pressure due to the acceleration. The airflow from outside the system is introduced into the negative pressure part from at least two suction ports, and the cooling part is connected to auxiliary equipment or the internal combustion engine main body that requires cooling, or two or more parts to be cooled, and the suction ports. By communicating with each other through ventilation means, air is drawn into the exhaust pipe system from the auxiliary equipment or the internal combustion engine side through the ventilation means, and the auxiliary equipment or the internal combustion engine body is forcibly air-cooled. Suction cooling method.