JPH0326258Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to an internal combustion engine equipped with a supercharger such as an exhaust turbo supercharger mounted in the engine room of an automobile.

[Conventional technology]

An air-cooled intercooler for cooling the supercharged air and a surge tank for eliminating pulsation are installed in the supercharging passage from the supercharger to the intake manifold. An internal combustion engine with a supercharger for an automobile disposed so as to be located on the front side of the automobile with respect to the tank is described in Japanese Utility Model Application Publication No. 59-17224 as a prior art.

[Problem that the invention attempts to solve]

The intercooler and surge tank of a supercharged internal combustion engine in a car are arranged side by side in the front and back direction of the car at the top of the internal combustion engine. However, in the prior art, the intercooler located at the front of the surge tank is located close to the surge tank, so the cooling air blowing through the intercooler is poor, and the cooling performance due to the running wind is poor. In order for the intercooler to dissipate a predetermined amount of heat, the intercooler must be made larger to account for the lower cooling performance.Moreover, in the prior art, the intercooler is arranged horizontally. Therefore, there was a problem in that the height of the front part of the bonnet, which covers the upper part of the intercooler and surge tank, had to be increased.

The present invention aims to solve the above-mentioned problems when a surge tank and an intercooler are disposed above an internal combustion engine mounted in an engine room.

[Means for solving the problem] Therefore, the present invention provides an air-cooled intercooler for cooling the supercharged air and a surge tank for eliminating pulsation in the supercharging passage from the supercharger to the intake manifold. In the case where an intercooler is disposed above an internal combustion engine in the engine room of a vehicle so as to be located on the front side of the vehicle relative to the surge tank, the intercooler located on the front side of the vehicle relative to the surge tank is The intercooler is configured to be inclined diagonally downward toward the front of the vehicle so that the gap between the cooler and the surge tank is wider on the upper side of the intercooler than on the lower side.

[Functions and effects of the idea]

With this configuration, the cooling air for the intercooler will easily blow through from the part where the gap between the intercooler and the surge tank is widened on the top side of the intercooler. On the other hand, since the intercooler is tilted diagonally downward toward the front of the car, the height to the intercooler decreases as it approaches the front of the car. be.

Therefore, according to the present invention, it is possible to avoid a decrease in cooling performance when the intercooler located in front of the surge tank is brought closer to the surge tank, so the intercooler can be made smaller and lighter, and furthermore, In addition to making the intercooler smaller, the height to the intercooler can be reduced toward the front of the vehicle, which has the effect of making it possible to lower the front part of the bonnet that covers the intercooler.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. In the drawing, reference numeral 1 indicates an internal combustion engine comprising a cylinder head 3 fastened to the top surface of a cylinder block 2, and a cylinder head cover 4 fastened to the top surface of the cylinder head 3. A carburetor 6 is attached to an intake manifold 5 attached to one side of the cylinder head 3, and a surge tank 7 for eliminating pulsation is connected to the upper surface of the carburetor 3. Exhaust manifold 8 attached to the other side
An exhaust turbo supercharger 9 is installed in which an exhaust turbine 9a and a blower compressor 9b are directly connected.

In this case, although the internal combustion engine 1 is not shown, the exhaust turbo supercharger 9 is located at the front and the carburetor 6 is located at the rear in the front engine room of the vehicle with respect to the forward direction of the vehicle. The surge tank 7 is installed horizontally, and the upper part of the surge tank 7 is covered with a bonnet 10 for the engine room, and the bonnet 10 has an air scoop 10a for taking the wind from the vehicle into the engine room. It is provided.

The upper part of the cylinder head cover 4 has an inlet header 11a at one end and an outlet header 11 at the other end.
b, an air-cooled intercooler that connects the inlet header 11a and the outlet header 11b with a plurality of finned flat cooling pipes 11c, and is provided with cover plates 11d and 11e on the upper and lower surfaces. 11 will be installed. The inlet header 11a of the intercooler 11 is provided with an inlet pipe 12 for supercharged air and a bypass outlet pipe 13. The supply line 14 is connected, and the bypass outlet pipe 13 is connected to the surge tank 7 via the bypass line 15, while the supercharging air outlet pipe 16 in the outlet header 11b is connected to the surge tank 7 via the supercharging line 17. Connect to surge tank 7.

In addition, the supercharged air flowing in from the inlet pipe 12 is passed through each finned flat cooling pipe 11c in the intercooler 11 into the inlet header 11a of the intercooler 11, and then sent to the outlet header 11a.
A supercharging switching valve 18 is provided for selectively switching the supercharging air flowing in from the inlet pipe 12 to the bypass outlet pipe 13 without passing through the intercooler 11.

The supercharging switching valve 18 is operated by a diaphragm type pressure operating mechanism 19. By connecting the pressure chamber 21 of the spring 20 to the boat 23 provided downstream of the throttle valve 22 in the carburetor 6 via the pressure transmission passage 24, When the intake pressure on the side is a large negative pressure on the vacuum side, this negative pressure operates the supercharging switching valve 18 to open the bypass outlet pipe 13, and the supercharging air flowing in from the inlet pipe 12 is transferred to the intercooler. However, when the intake pressure on the downstream side of the throttle valve 22 increases to approach atmospheric pressure, the supercharging switching valve 18 is activated by the spring 20. It operates to close the bypass outlet pipe 13 and allows the supercharged air flowing in from the inlet pipe 12 to pass through the intercooler 11. It should be noted that the pressure transmission passage 24 is connected to the temperature of the engine, the temperature inside the engine room, or the temperature of atmospheric air when these temperatures are high; A temperature switching valve 26 is provided which operates to cut off communication of the pressure transmission passage 24 and to communicate the pressure chamber 21 with the atmospheric passage 25 when the temperature is low.

Then, an intercooler 11 disposed on the front side of the automobile above the cylinder head cover 4,
In a side view of the internal combustion engine 1, the distance between the rear end surface of the intercooler 11 and the surge tank 7 is as follows:
Top cover plate 11d in intercooler 11
so that the side is wider than the bottom cover plate 11e,
It is configured to be inclined diagonally downward by an appropriate angle (θ) toward the front of the vehicle.

Air scoop 10 in the bonnet 10
Among the traveling winds taken into the engine room from sources such as a, the traveling winds flowing between the upper and lower cover plates 11d and 11e in the intercooler 11 are as follows:
By configuring the gap between the rear end face of the intercooler 11 and the surge tank 7 to be wider on the side of the upper cover plate 11d than on the side of the lower cover plate 11e, it is possible to easily blow through from the wide gap part. Therefore, the amount of running air introduced into the intercooler 11 increases by this amount.Also, it is possible to tilt the intercooler 11 diagonally downward by an appropriate angle (θ) toward the front of the vehicle. Therefore, the height from the ground to the top surface of the intercooler 11 decreases toward the front of the vehicle.

Note that one end of the intercooler 11 is attached to the cylinder head cover 4 by fastening bolts 27, and the other end is attached to the cylinder head cover 4 with a support bracket 28 fixed to the lower surface thereof. It is attached to the surge tank 7 by fastening bolts 29 and 30, respectively, and a plurality of cooling promotion fins 7a are integrated on the front surface of the surge tank 7 facing the intercooler 11. It is formed.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a plan view of an internal combustion engine with a supercharger, and FIG.
Fig. 3 is a partially cutaway plan view of the intercooler and surge tank, and Fig. 4 is a side view of Fig. 3.
FIG. 3 is an enlarged cross-sectional view. 1...Internal combustion engine, 2...Cylinder block, 3
... Cylinder head, 4 ... Cylinder head cover, 5 ... Intake manifold, 6 ... Carburetor, 7
...Surge tank, 8...Exhaust manifold, 9
...Exhaust turbo supercharger, 10...Bonnet, 1
1...Intercooler, 11d, 11e...Intercooler cover plate.

Claims (1)

[Scope of utility model registration request] An air-cooled intercooler for cooling the supercharged air and a surge tank for eliminating pulsation are installed in the supercharging passage from the supercharger to the intake manifold. In an internal combustion engine with a supercharger for an automobile, which is arranged so as to be located in front of the vehicle rather than the tank, the intercooler is located in the front of the vehicle than the surge tank, and the distance between the intercooler and the surge tank is An internal combustion engine with a supercharger for an automobile, characterized in that the cooler is inclined diagonally downward toward the front of the vehicle so that the upper side of the cooler is wider than the lower side.