JPH04308318A - Internal combustion engine with supercharger - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in an internal combustion engine equipped with a supercharger driven by a crankshaft of the engine body.

0002

[Prior Art] Conventionally, an internal combustion engine has a supercharger driven by a crankshaft of the engine main body, and an intake air passage pressurized by the supercharger is installed in an intake passage connected to an intake manifold of an engine main body. A supercharged internal combustion engine equipped with an intercooler for this purpose is well known (see Japanese Patent Laid-Open No. 63-93623).

0003

[Problems to be Solved by the Invention] In order to improve the output of the supercharged internal combustion engine, it is necessary to install an intercooler in the intake system to cool the intake air pressurized by the supercharger. is unavoidable, and the intercooler is required to secure the capacity necessary to effectively cool the pressurized intake air.

However, this approach results in an increase in the capacity of the entire intake system, which tends to worsen the responsiveness of supercharging when the throttle is opened, especially when the throttle is opened rapidly. Furthermore, since a supercharger and an intercooler are installed in the intake system, the overall size of the internal combustion engine tends to increase, and there is also the problem that the layout becomes difficult, especially when installed in a vehicle.

The present invention was made in view of the above circumstances, and although an intercooler is installed in the intake system,
A supercharged internal combustion engine that reduces the capacity downstream of the supercharger in the intake system to significantly improve engine supercharging start-up response, making it possible to make the entire internal combustion engine more compact, making it effective for use in vehicles. The purpose is to provide the following.

[0006]

[Means for Solving the Problems] In order to achieve the above object, the present invention is characterized in that, in an internal combustion engine equipped with a supercharger driven by a crankshaft of the engine main body, the supercharger is connected to the engine main body. The supercharger is disposed below the intake manifold, and an intercooler is disposed in parallel on the outside of the intake manifold and the supercharger, close to them, and the discharge port of the supercharger is connected to the inlet of the intercooler. connect directly,
The outlet of the intercooler is connected to the intake manifold via a throttle valve.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment in which the present invention is applied to an in-line four-cylinder internal combustion engine will be described below with reference to FIGS. 1 to 3.

FIG. 1 is a schematic front view of a supercharged internal combustion engine of the present invention, FIG. 2 is a plan view thereof, and FIG. 3 is a partially cutaway sectional view of essential parts taken along line 3--3 in FIG.

An intake manifold 2 is attached to one longitudinal side of the cylinder head 1 of the engine body E of the DOHC type in-line four-cylinder internal combustion engine, and the intake manifold 2 is connected to the intake manifold 2 through an intake passage 21 and an intake chamber 22. The main branch paths 23 are branched and communicated with each of the four cylinders of the engine body. A fuel injection valve V is provided in each branch path 23, respectively.

[0010] A non-contact screw type supercharger Sc is disposed below the intake manifold 2. This supercharger Sc is constructed by housing a male rotor 4 and a female rotor 5 that are meshed with each other in a cocoon-shaped rotor chamber 3, and its suction port 6 is opened to the atmosphere via an air cleaner (not shown). , and the discharge port 7 is opened toward the outside of the engine body E.

As shown in FIGS. 1 and 2, a driven wheel 9 fixed to the drive shaft 8 of the supercharger Sc is interlocked with a drive wheel 11 fixed to the crankshaft 10 of the engine body E via an endless transmission band 12. The supercharger Sc is constantly driven to rotate while the engine is operating. A tension ring 13 is pressed against the loose side of the endless transmission band 12 to apply a predetermined tension to the band 12.

[0012] The intake manifold 2 and the supercharger Sc
An intercooler Ic, which is fixed to one side of the engine body E via a bracket 28, is arranged in parallel on the outside of the engine body E, close to them. This intercooler Ic is constructed by integrally connecting an upper tank 15 at the upper part of a flat rectangular parallelepiped heat exchange section 14 and a lower tank 16 at the lower part thereof.The lower tank 16 faces the discharge port 7 of the supercharger Sc. The upper tank 15 also has an outlet 18 that opens toward the engine body E above the intake manifold 2. The discharge port 7 of the supercharger Sc and the inlet 17 of the intercooler Ic are connected via a flexible mount 19 made of rubber or the like. Further, cooling water inlets 20 are provided at the upper and lower parts of the heat exchange section 14, respectively.
, and the outlet 21 is opened.

The intake manifold 2 and intercooler I
An intake bypass passage 22, which is integral with the intake manifold 2, is provided in the gap between the intake manifold 2 and the intake bypass passage 22, and this intake bypass passage 22 is communicated with the suction side of the supercharger Sc via a communication pipe 27.

The upper surface of the intake manifold 2 and the upper end surface of the intake bypass passage 22 are formed substantially flush with each other, and a valve body 23 is integrally connected thereto. Valves 25 are arranged in parallel.

One end of a connecting pipe 29 curved into an elbow shape is connected to the upper surface of the valve body 23 via a flexible joint 26 made of rubber or the like, and the other end of the connecting pipe 29 is connected to the upper tank 15 of the intercooler Ic. Exit 18 of
connected to.

As shown in FIGS. 1 and 2, the supercharger Sc
The intake system including the intercooler Ic is formed into a substantially rectangular plane and side shape, has no partially protruding parts, is compact as a whole, and is arranged in parallel close to one side of the engine body E. The upper surface of the intake system is formed at approximately the same level as the upper surface of the engine body E.

Next, the operation of this embodiment will be explained. When the engine is now operated, the supercharger Sc is driven in conjunction with the rotation of the crankshaft 10, thereby causing clean outside air to flow through an air cleaner (not shown). As shown by arrow A in FIG. 2, the pressurized intake air is drawn into the supercharger Sc and pressurized, and the pressurized intake air flows into the intercooler Ic, where it is cooled by cooling water and then connected to the connecting pipe 29 and the throttle valve 24. The air then flows into the intake manifold 2, from where it is distributed and sucked into the four cylinders of the engine body E.

The flow rate of intake air into the engine body E is controlled by opening and closing a throttle valve 24 and a bypass valve 25 within the valve body 23. Accordingly, when the bypass valve 25 is opened, a portion of the pressurized cooled intake air from the intercooler Ic passes through the intake bypass passage 22 and the communication pipe 27 to the supercharger Sc.
directly upstream.

Next, a second embodiment of the present invention will be described with reference to FIGS. 4 and 5. In this second embodiment, the first
The same members as in the embodiment are given the same reference numerals.

FIG. 4 is a plan view of a four-cylinder internal combustion engine equipped with the present invention, and FIG. 5 is a sectional view taken along line 5--5 in FIG. This embodiment is structurally different from the first embodiment in that the relative positions of the intake bypass passage 1021 and the intake bypass passage 122 with respect to the engine body E are reversed. That is, intake manifold 1
A valve body 123 connected to the upstream side of the engine 02 is provided with a bypass valve 125 close to the engine body E, and a throttle valve 124 arranged in parallel on the outside thereof. The throttle valve 124 is connected to the suction side of the machine Sc and to the intake passage 1021 of the intake manifold 102, respectively. The intake chamber 1022 of the intake manifold 102 is located outside the intake bypass passage 122, and there are four branch passages 102 connected thereto.
3 is connected to the engine body E across the intake bypass passage 122.

The second embodiment also has the same effects as the first embodiment.

In the first and second embodiments, the intake system includes a supercharger Sc disposed below the intake manifold 2, and an intercooler Ic disposed close to and parallel to the outside of the supercharger Sc. , by directly connecting the inlet 17 of the intercooler Ic to the discharge port 7 of the supercharger Sc, the
The volume of the intake passage on the downstream side is reduced, improving supercharging response.

[0023] The supercharger Sc also has an intake manifold 2.
By disposing the intercooler Ic in the dead space below and arranging the intercooler Ic on the outside of the intake manifold 2 and the supercharger Sc close to them, the entire intake system including the supercharger Sc and the intercooler Ic can be made more compact. becomes possible.

In the above embodiments, the present invention was applied to an in-line four-cylinder engine, but it is of course possible to apply the present invention to other types of engines. Types can be used.

[0025]

[Effects of the Invention] As described above, according to the present invention, the capacity of the intake system from the downstream side of the supercharger to the intake manifold can be significantly reduced, and the startup response of supercharging can be improved. can.

Furthermore, by reducing the capacity of the intake system including the supercharger and intercooler and arranging it close to the engine body, the entire supercharged internal combustion engine can be made more compact, making it extremely effective for use in vehicles.

[Brief explanation of the drawing]

[Fig. 1] A schematic front view of a first embodiment of an internal combustion engine with a supercharger of the present invention.

[Figure 2] Its plan view

[Figure 3] Partially broken main part sectional view taken along line 3-3 in Figure 2

[Figure 4
] Plan view of a second embodiment of the internal combustion engine with a supercharger of the present invention

[Figure 5
] Cross-sectional view along line 5-5 in Figure 4

[Explanation of symbols]

2,102 Intake manifold 7 Supercharger discharge port 10
Crankshaft 17 Inlet 18 Outlet 22, 122 Intake bypass passage 23 Valve body 24, 124 Throttle valve 25, 125 Bypass valve E Engine body Ic Intercooler Sc
supercharger

Claims (2)

[Claims] [Claim 1] Crankshaft (10) of engine body (E)
In an internal combustion engine equipped with a supercharger (Sc) driven by an intake manifold (Sc) connected to the engine body (E),
The supercharger (Sc) is disposed below the intake manifold (2, 102) and the supercharger (Sc).
Install the intercooler (Ic) on the outside of the
) are arranged in parallel, and the discharge port (7) of the supercharger (Sc) is directly connected to the inlet (17) of the intercooler (Ic),
The outlet (18) of the intercooler (Ic) is connected to the intake manifold (2, 124) via the throttle valve (24, 124).
102) An internal combustion engine with a supercharger. 2. A valve body (23) is interposed between the intercooler (Ic) and the intake manifold (2, 102), and the throttle valve (2) is connected to the valve body (23).
4,124) and an intake bypass passage (22,122) that short-circuits between the intercooler (Ic) and the supercharger (Sc).
2. The internal combustion engine with a supercharger according to claim 1, further comprising a bypass valve (25, 125) provided in the engine.