JPH0318662Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an internal combustion engine equipped with an exhaust turbo supercharger.

[Conventional technology]

Modern internal combustion engines are equipped with exhaust turbo superchargers to improve output and reduce fuel consumption, but the supercharged air from this exhaust turbo supercharger becomes hot due to compression. In addition to this, there is high-frequency pulsation, so if this supercharged air is directly introduced into the combustion chamber of the engine, not only will the charging efficiency decrease, but also knocking will occur frequently. When fuel is supplied by the carburetor immediately before the engine is supplied, phenomena such as adverse thermal effects such as vapor lock on the carburetor or a decrease in the amount of air intake into the engine due to pulsation occur.

Therefore, Japanese Patent Application Laid-Open No. 55-142932 as a prior art discloses that a surge tank for eliminating pulsation is provided in the intake passage from the blower of the exhaust turbocharger to the engine, and a cooler is provided inside this surge tank. In addition, Japanese Patent Laid-Open No. 57-5514, which is also prior art, describes an air-cooled or liquid-cooled cooler and a pulsating air-cooled cooler in the intake passage from the blower of the exhaust turbocharger to the engine. It is disclosed that a surge tank for erasing is installed in parallel.

[The problem that the idea aims to solve]

However, although the former type, which has a built-in cooler inside the surge tank, has the advantage of eliminating the need for supporting members for the cooler, this type does not require the cooler to be built using the wind from the car or natural heat dissipation. Since it cannot be air-cooled and a liquid-cooled cooler driven by the internal combustion engine must be used, there will be a corresponding loss in the output of the internal combustion engine. In this case, the temperature is lowered by bringing supercharged air into contact with the outer surface of the surge tank, which reduces the volume of the surge tank by the volume of the cooler, so in order to maintain the ability to eliminate pulsation in the surge tank, However, the size of the surge tank must be increased by the volume of the cooler, which increases the installation space and weight of the surge tank.

In addition, with this structure in which the cooler is built into the surge tank, the surge tank must be disassembled each time the cooler is maintained and inspected, making maintenance and inspection of the cooler extremely troublesome. It was hot.

On the other hand, in the latter case where a cooler and a surge tank are installed side by side in the intake passage, the cooler can be air-cooled to prevent output loss of the internal combustion engine, and
Although it has the advantage of making maintenance and inspection of the cooler easier, it requires a conduit between the cooler and the surge tank, and also requires a member to support the cooler with respect to the internal combustion engine. Moreover, since the cooler and surge tank must each have a sturdy structure to withstand the vibrations of the internal combustion engine, when installing the cooler and surge tank,
There is a problem that the overall installation space and overall weight increase, and for this reason, it has been extremely difficult to apply it to a small internal combustion engine or an internal combustion engine for automobiles.

The present invention aims to solve the problems of these prior art techniques.

[Means to solve the problem]

To achieve this objective, the present invention includes an air-cooled cooler for the supercharged air and an air-cooled cooler for eliminating intake pulsation in the intake passage downstream of the blower outlet of the exhaust turbocharger driven by exhaust gas. In an exhaust turbocharged internal combustion engine, the air-cooled cooler is provided between an inlet tank and an outlet tank, and between the inlet tank and the outlet tank. a plurality of mounted finned tubes, an inlet tank and an outlet tank of the cooler are fixed to one side of the surge tank, and an outlet of the blower is connected to the inlet tank of the cooler. , the outlet tank of the cooler is configured to communicate with the surge tank.

[Functions and effects of the idea]

With this configuration, the pulsation of the supercharged air from the blower in the exhaust turbocharger is attenuated by the resistance as it flows through the inlet tank and finned tube in the cooler, and By communicating directly with the surge tank, the outlet tank of the cooler is also used as a surge tank, so the volume of the surge tank can be reduced by the volume of the outlet tank. The surge tank can be made smaller and lighter by being able to attenuate pulsations and by being able to use the outlet tank of the cooler as the surge tank.

In addition, since the cooler is fixed to one side of the surge tank and the outlet tank of the cooler is directly connected to the surge tank, the conduit connecting the cooler and the surge tank and the cooler can be connected directly to the surge tank. By completely eliminating the need for supporting members, and by integrally fixing the cooler and surge tank,
Since the surge tank and the cooler serve as mutually reinforcing members, the rigidity of the cooler and the surge tank can be improved without making the structure stronger. The synergistic effect of the ability to make the surge tank smaller and lighter makes it possible to reduce the installation space for the cooler and the surge tank as a whole, and to reduce the weight of the internal combustion engine as a whole.

Since the cooler for the supercharged air is air-cooled, there is no loss in the output of the internal combustion engine due to cooling the supercharged air, and the cooler is located outside the surge tank. , the ease of maintenance and inspection of the cooler is not impaired.

Therefore, according to the present invention, when a cooler and a surge tank for supercharged air are provided in the intake passage, engine output loss may occur, and maintenance and maintenance of the cooler may be required.
This has the effect of reducing the mounting space for the cooler and surge tank without impairing the ease of inspection, and also reducing the weight of the internal combustion engine as a whole.

〔Example〕

Hereinafter, an embodiment in which the present invention is applied to a carburetor internal combustion engine installed in a car will be explained based on the drawings. An internal combustion engine is shown installed horizontally in a room 3 with the crank axis substantially perpendicular to the direction of travel of the automobile, and an intake manifold 5 with a carburetor 4 is located on the rear side of the internal combustion engine 1 in the direction of travel, and an intake manifold 5 with a carburetor 4 is placed on the front side. are each equipped with an exhaust manifold 6.

Reference numeral 7 indicates an exhaust turbo supercharger formed by directly connecting an exhaust turbine 8 and a blower 9. The exhaust turbo supercharger 7 is located at the front with respect to the traveling direction of the internal combustion engine 1, and The exhaust manifold 6 is connected to the inlet of the turbine 8, and the exhaust pipe 10 for discharging exhaust gas to the atmosphere is connected to the outlet.

Moreover, the blower 9 in the exhaust turbo supercharger 7
An air cleaner 11 is connected to the inlet of the blower 9, while an outlet of the blower 9 is connected to the carburetor 4 through an intake passage 12, and an air-cooled cooler 13 and a surge tank 14 for supercharged air are connected to the intake passage 12. and.

The surge tank 14 has a flat box shape, is located downstream of the cooler 13, and has a connection port 15 to the carburetor 4 on its lower surface. On the other hand, the cooler 13 includes an inlet tank 17 and an outlet tank 18 having a connection port 16 to the intake passage 12, and a plurality of finned tubes installed between the inlet tank 17 and the outlet tank 18. 19, the inlet tank 17 and outlet tank 18 are fixed to one side of the surge tank 14, and the outlet tank 18 is directly communicated with the surge tank 14.

Incidentally, an air scoop 20 is provided on the bonnet cover 2 of the engine room 3, and the air scoop 20 is configured to take in air from the vehicle running into the cooler 13 and 14 surge tanks.
7 and the outlet tank 18 are provided with guide plates 21 and 2.
2 is provided.

With this configuration, the supercharged air from the blower 9 in the exhaust turbocharger 7 is transferred to the cooler 13.
Inlet tank and finned tube 19
The pulsation is attenuated by the resistance when flowing through the cooler 13, and the outlet tank 18 in the cooler 13 is directly connected to the surge tank 14, so the outlet tank 18 plays the role of the surge tank 14. The volume of the surge tank 14 can be reduced by the volume of the outlet tank 18, and these
The surge tank 14 can be made smaller and lighter because the inlet tank 17 and the finned tube 19 can attenuate pulsations and the outlet tank 18 of the cooler 13 can also be used as the surge tank 14.

Further, since the cooler 13 is integrally fixed to the surge tank 14, a pipe connecting the cooler 13 and the surge tank 14 is not required, and the cooler 13 is supported with respect to the internal combustion engine 1. There is no need to provide a separate member, and since the cooler 13 and the surge tank 14 serve as mutually reinforcing members, the cooler 13 and the surge tank 14 do not have to have a thick and sturdy structure. , the rigidity of the cooler 13 and the surge tank 1 can be improved, and due to the synergistic effect of these factors and the fact that the surge tank 14 can be made smaller and lighter as described above, the cooler 13 and the surge tank 1 can be installed in the intake passage.
4, it is possible to reduce the installation space for the cooler 13 and the surge tank 14 and to reduce the weight of the internal combustion engine 1 as a whole.

Since the cooler 13 is air-cooled, the provision of the cooler 13 does not cause any loss in the output of the internal combustion engine 1, and the cooler 13 is located outside the surge tank 14. Therefore, the ease of maintenance and inspection of the cooler 13 is not impaired.

Although the above embodiments were applied to a carburetor type internal combustion engine, it goes without saying that the present invention can also be applied to a fuel injection type internal combustion engine.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a side view, FIG. 2 is a plan view, FIG. 3 is an enlarged cross-sectional view of FIG. 1, and FIG. 4 is a cross-sectional view of FIG. 3. It is. 1... Internal combustion engine, 4... Carburetor, 5... Intake manifold, 6... Exhaust manifold, 7... Exhaust turbo supercharger, 8... Exhaust turbine, 9... Blower, 12... Intake passage, 13...Cooler, 1
4... Surge tank, 17... Inlet tank, 18
...Exit tank, 19...Tube with fins.

Claims (1)

[Scope of utility model registration request] In the intake passage downstream of the blower outlet of the exhaust turbocharger driven by exhaust gas,
In an exhaust turbocharged internal combustion engine comprising an air-cooled cooler for supercharged air and a surge tank for eliminating intake pulsation, with the surge tank on the downstream side, the air-cooled cooler is located on the inlet tank. and an outlet tank, and a plurality of finned tubes installed between the inlet tank and the outlet tank, and the inlet tank and outlet tank of the cooler are fixed to one side of the surge tank. . An exhaust turbocharged internal combustion engine, wherein an outlet of the blower is connected to an inlet tank in the cooler, and an outlet tank in the cooler is communicated with the surge tank.