JPH08144774A - Intake device of engine with mechanical supercharger - Google Patents

Abstract

PURPOSE: To provide compact layout of an intake manifold, a mechanical supercharger and the like in an engine with a supercharger. CONSTITUTION: An intake device of an engine with a mechanical supercharger is so constructed that a mechanical supercharger 4 having two rotor shafts 5, 6 is disposed below an intake manifold 3 connected to a cylinder head 2 on the side of an engine main body 1 in such a manner that both rotor shafts 5, 6 are substantially parallel to a crankshaft 18, and intake air is supplied into the engine main body 1 through the mechanical supercharger 4. Accordingly, the intake manifold 3 is provided with an inclined part (branch pipe 3a) extended upward obliquely to the cylinder head 2, the mechanical supercharger 4 is disposed in such a manner that a line connecting between two rotor shafts 5, 6 is substantially in the same direction as the inclined part (branch pipe 3a) of the intake manifold 3, and the uppermost end of the mechanical supercharger 4 is positioned above the connecting lower end part of the intake manifold 3 to the cylinder head 1 and below the inclined part (branch pipe 3a) above the connecting lower end part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intake system for an engine with a mechanical supercharger.

[0002]

2. Description of the Related Art In recent years, a turbocharger (for example, a machine driven to rotate by a crankshaft) for an automobile engine has been demanded in order to improve the output per exhaust capacity, reduce the weight per horsepower, and reduce the outer dimensions per horsepower. Type supercharger) is being adopted.

Since this mechanical supercharger (for example, the Lisholm compressor) is a large and heavy device among various devices attached to the engine, the size of the entire engine is increased depending on its arrangement. In addition, there is a risk of causing a problem, and a layout considering weight balance is also required.

Further, a layout is required which is a vibration source which causes vibrations when the mechanical supercharger itself is operating and which is relatively free from resonance with engine vibrations.

Due to the above requirements, various attempts have been made to arrange the mechanical supercharger in the engine body.

For example, as disclosed in Japanese Patent Application Laid-Open No. 4-308319, at the side of an in-line engine,
It has been proposed to arrange a mechanical supercharger (for example, a Risholm type compressor) below the intake manifold.

[0007]

However, in the case of the above-mentioned publicly known example, although the mechanical supercharger (for example, the Lisholm type compressor) is arranged below the intake manifold, the mechanical supercharger (for example, , Risholum type compressor) is in a vertically long position (that is, the line connecting the two rotor shafts of the Risholm type compressor goes up and down), so the space below the intake manifold cannot be used effectively, and an engine including these There is a limit to the overall compactness.

Moreover, in addition to the mechanical supercharger described above, an oil filter, a starter, etc. are inevitably attached, so it is necessary to make them compact.

The present invention has been made in view of the above points, and an object thereof is to enable a compact layout of an intake manifold, a mechanical supercharger and the like in an engine with a supercharger.

[0010]

In the basic configuration of the present invention, as a means for solving the above problems, a mechanical supercharger having two rotor shafts (for example, a Rishorum compressor) is provided on the side of the engine body. At a position below the intake manifold connected to the cylinder head so that both rotor shafts are substantially parallel to the crankshaft, and the engine is provided via the mechanical supercharger (for example, Rishorum compressor). In an intake device for an engine with a mechanical supercharger configured to supply intake air into the main body, the intake manifold is configured to have an inclined portion extending obliquely upward with respect to a cylinder head, and In the intake manifold, the line connecting the two rotor shafts of a turbocharger (for example, a Lisholm compressor) is used. Is arranged in substantially the same direction as the inclined portion of the intake manifold, and the uppermost end of the mechanical supercharger (for example, Risholm type compressor) is located above the lower end of the intake manifold connected to the cylinder head and the lower end of the connection. It is located below the inclined part above the part.

In the basic configuration of the present invention, in the mechanical supercharger, the rotor shaft for the male rotor of the two rotor shafts is located close to the engine body, and the rotor shaft for the female rotor is the engine body. It is preferable to dispose it in a posture in which it is located away from the device from the viewpoint that vibration due to the action of the driving force can be suppressed.

Further, it is possible to effectively utilize a space formed below the mechanical supercharger by installing an oil filter or a starter located below the mechanical supercharger on the side of the engine body. It is preferable in terms.

[0013]

In the basic structure of the present invention, the following actions can be obtained by the above means.

That is, the machine in a posture in which the space formed below the inclined portion of the intake manifold is effectively used (that is, in a posture in which the line connecting the two rotor shafts is oriented substantially in the same direction as the inclined portion of the intake manifold). A compact layout of a turbocharger (for example, a Lisholm compressor) will be obtained, and other components (for example, an oil filter and a starter) will be provided under the mechanical turbocharger (for example, a Risholm compressor). It can be installed well.

In the basic configuration of the present invention, in the mechanical supercharger, the rotor shaft for the male rotor of the two rotor shafts is located close to the engine body, and the rotor shaft for the female rotor is the engine body. When the rotor shaft for the male rotor, on which the driving force acts, is located closer to the engine main body, it is effective in suppressing the vibration when it is arranged in a posture in which it is located away from the engine.

Further, when an oil filter or a starter is attached to the side of the engine body below the mechanical supercharger, a relatively large working space is provided below due to the compact layout of the mechanical supercharger. Since it is possible to improve the workability of installing and removing the oil filter and starter.

[0017]

According to the present invention, the posture effectively utilizing the space formed below the inclined portion of the intake manifold (that is, the line connecting the two rotor shafts is oriented substantially in the same direction as the inclined portion of the intake manifold). The compact layout of the mechanical supercharger (for example, Risholum compressor) can be obtained in different postures, so that the entire engine can be downsized and the mechanical supercharger (for example, Risholum compressor) can be obtained. Other parts underneath (eg oil filters and starters, etc.)
It has an excellent effect that it can secure a space to attach the with good workability.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

As shown in FIGS. 1 to 3, the engine air intake system of this embodiment has a mechanical supercharger (hereinafter, referred to as a Risholm compressor) 4 having two rotor shafts 5 and 6. Is located below the intake manifold 3 connected to the cylinder head 2 on the side of the engine body 1, and the two rotor shafts 5 and 6 are connected to the crankshaft 1.
8 is arranged so as to be substantially parallel to 8 and is configured to be able to supply intake air into the engine body 1 via the Rishorum compressor 4 and connected to the inlet side of the Rishorum compressor 4. Throttle valve 7
An air-cooled intercooler 8 connected to the outlet side of the Rishorum compressor; a surge tank 9 connected to the outlet side of the intercooler 8 and connected to an intake manifold; and the Rishorum compressor 4 bypassed. And an intake bypass valve 10 that controls the flow of intake air. Reference numerals 11 and 12 denote Es arranged on the upstream side and the downstream side of the Lishorum compressor 4, respectively.
GR valve, 13 is an oil filter, and 14 is a starter.

The Rishorum compressor 4 is shown in FIG.
Or, as shown in FIG. 6, the intake introduction portion 4a and the compression portion 4b.
And a gear box portion 4c. The compression portion 4b is pivotally supported on the rotor shaft 5 and has a male rotor 15 having three spiral ridges 15a, and the rotor shaft 6 is pivotally supported. In addition, the female rotor 16 having five spiral valleys 16a meshing with the mountain portion 15a of the male rotor 15 is formed by the mountain portion 15
a and the valley portion 16a are meshed with each other and are rotatably accommodated. In addition, the pulley 1 is attached to the rotor shaft 5 of the male rotor 15.
9 is pivotally supported, and power is input from a crankshaft pulley 20 connected to the pulley 19 via a belt (not shown). A gear unit 17 for transmitting the driving force input to the rotor shaft 5 to the rotor shaft 6 of the female rotor 16 is housed in the gear box portion 4c.

In the case of this embodiment, the engine body 1
Is mounted on the vehicle body in a slanted state on the front side of the vehicle body by a predetermined angle. The intake manifold 3 includes a plurality of branch pipes 3a (for example, the same number as the number of cylinders of the engine body 1) branched from the surge tank 9 and connected to the cylinder head 2 of the engine body 1. The branch pipe 3a constitutes an inclined portion that extends obliquely upward with respect to the cylinder head 2 on the side of the engine body 1 opposite to the slant side. With this structure, a relatively large space S can be secured below the intake manifold 3.

The Rishorum compressor 4
Is arranged such that the line connecting the two rotor shafts 5 and 6 is substantially in the same direction as the direction in which the intake manifold 3 extends (in other words, the branch pipe 3a that is the inclined portion), and the Rishorum compressor 4 Is located above the lower end of the intake manifold 3 connected to the cylinder head 2 and below the inclined part (in other words, the branch pipe 3a) above the lower end of the connection. Moreover, in the case of the present embodiment, the Lisholm type compressor 4 includes the male rotor 15 out of the two rotor shafts 5 and 6.
The rotor shaft 5 for the engine is located close to the engine body 1, and the rotor shaft 6 for the female rotor 16 is located away from the engine body 1 (see FIG. 1).

With the above construction, the inclined portion of the intake manifold 3 (in other words, the branch pipe 3
a) The Rishorum compressor in a posture in which the space S formed below is effectively used (that is, the line connecting the two rotor shafts 5 and 6 is oriented substantially in the same direction as the branch pipe 3a of the intake manifold 3) A compact layout of 4 will be obtained. Moreover, the Rishorum compressor 4 positions the rotor shaft 5 for the male rotor 15 of the two rotor shafts 5, 6 close to the engine body 1, and separates the rotor shaft 6 for the female rotor 16 from the engine body 1. Since the rotor shaft 5 for the male rotor on which the driving force acts is brought closer to the engine body 1, it is effective in suppressing vibration because the male rotor shaft 5 is driven by the driving force.

Further, intake air introduced from an air filter (not shown) is introduced into the intake air introduction portion 4a of the Rishorum compressor 4 through an inlet pipe 21 having a throttle valve 7. The throttle valve 7 is disposed on the side of the engine body 1 and in the upper rear part of the Rismolum compressor 4. Then, the compression unit 4b of the Rishorum compressor 4
The intake air that has been compressed in the above is discharged from the discharge port 22 formed on the side opposite to the engine main body side in the compression section 4b to the outlet pipe 23.
It is supposed to be supplied to the intercooler 8 via.

The intercooler 8 is arranged apart from the engine body 1 and above the Rismolum compressor 4. Even if the intercooler 8 is arranged at a position distant from the engine body 1 as described above, the intercooler 8 is a comparatively light component, so that a problem in weight balance hardly occurs.

Further, the inlet pipe 21 has the inlet pipe 2
1, the intake bypass valve 10 is provided below the intake bypass valve 10, and the downstream side of the intake bypass valve 10 is
Bypass intake passage 2 that supplies bypass intake air to an intake passage 24 that connects the outlet side of the intercooler 8 and the intake manifold 3 (specifically, the surge tank 9).
4a is connected. When the intake bypass valve 10 is provided below the inlet pipe 21 as described above, the lateral projection amount of the Rishorum compressor 4 is suppressed as small as possible, and the overhang amount from the engine body 1 is reduced. Will be done. Therefore, the entire engine can be made compact.

Furthermore, in the present embodiment, as a result of the arrangement of the Lisholm type compressor 4 as described above, since a sufficient working space can be secured below the Lisholm type compressor 4, the side of the engine body 1 can be secured. An oil filter 13 and a starter 14 are mounted below the Risholum compressor 4. The oil filter 13 is arranged on the front side of the vehicle body, and the starter 14 is arranged on the rear side of the vehicle body.

Next, the mounting structure of the Lisholm compressor 4 to the engine body 1 will be described.

This Rishorum compressor 4 is shown in FIG.
As shown in FIG. 2, the front support bracket 25 is supported by a pair of front and rear support brackets 25 and 26 with respect to the engine body 1. The front support bracket 25 is a mounting boss 27 formed below the gear box portion 4c of the Rishorum compressor 4. The rear support bracket 26 supports a mounting boss 28 formed in the lower portion of the intake air intake portion 4a of the Lishorum compressor 4.

The front support bracket 25 is
An intermediate support point 30 bolted up to the mounting boss 27 by a bolt 29 parallel to the rotor shafts 5 and 6, and rotor shafts 5 and 6 above the intermediate support point 30 with respect to the engine body 1. Three orthogonal bolts 31, 32, 3
3 upper support points 34,3 bolted up by 3
5 and 36 and lower support points 38 below the intermediate support points 30 and bolted up to the engine body 1 by bolts 37 parallel to the rotor shafts 5 and 6, and the upper support points 34, 35, 36 and intermediate support point 30
And a lower support point 38 and a substantially triangular support wall portion 25a orthogonal to the rotor shafts 5 and 6, and the intermediate support point 30.
From the engine main body 1
A substantially triangular mounting wall portion 25b extending along the side wall of the engine body 1 and a substantially triangular mounting wall portion 25c extending downward from the intermediate support point 30 and extending along the side wall of the engine body 1. It is composed of a rigid body.
In addition, a pair of bosses 39, 39 serving as bolt-up mounting portions to the engine body 1 are integrally formed at the lower end of the mounting wall portion 25c.

On the other hand, the rear support bracket 26 has an intermediate support point 41 which is bolted up to the mounting boss 28 by a bolt 40 parallel to the rotor shafts 5 and 6, and above the intermediate support point 41. An upper support point 43 bolted up to the engine body 1 by a bolt 42 orthogonal to the rotor shafts 5 and 6, and an upper support point 43 below the intermediate support point 41 and orthogonal to the rotor shafts 5 and 6 relative to the engine body 1. And a pair of bolts 44, 4 having a predetermined distance in the diagonal direction
And a lower support point 46, 47 which is bolted up by means of 5, and which connects the upper support point 43, the intermediate support point 41 and the lower support points 44, 45 and is substantially triangular in shape orthogonal to the rotor shafts 5, 6. Support wall portion 26a and the intermediate support point 4
1, a substantially straight mounting wall portion 26b extending upward from the engine main body 1 and the intermediate support point 41.
Extending downward from the lower support point 4
It is integrally configured by a rigid body that connects 4, 45 and a substantially V-shaped mounting wall portion 26c along the side wall of the engine body 1.

With the above construction, the vibrations transmitted from the engine body 1 to the Lishorum compressor 4 are absorbed by the substantially triangular support wall portions 25a and 26a of the front and rear support brackets 25 and 26, and Vibration of the main body 1 in the front-rear direction of the vehicle body is absorbed by the mounting wall portions 25b and 25c of the front support bracket 25, and the vibration resistance performance is significantly improved. It should be noted that the connecting portion between the front and rear support brackets 25 and 26 and the Rishorum compressor 4 is connected to the gear box portion 4c and the intake air intake portion 4 of the Rishorum compressor 4.
Since it is set to a, no force due to vibration or the like acts on the compression portion 4b, and it is possible to prevent a reduction in clearance accuracy in the male rotor 15 and the female rotor 16 in the compression portion 4b.

Further, in the present embodiment, the surge tank 9 in the intake manifold 3 is provided above the gear box portion 4c in the Lishorum compressor 4.
The mounting portion 48 of the above is integrally projected. Further, a pivotal support portion 51 of the rotor shaft 5 is provided on the outer peripheral surface of the gear box portion 4c.
Reinforcing ribs 49, from the position toward the mounting portion 48 and the position substantially symmetrical with respect to the position and the pivotal support portion 51.
50 are formed respectively. In addition, inner reinforcing ribs 52 radially extending from the pivotally supporting portion 50 are integrally formed on the inner peripheral surface of the gear box portion 4c. With this configuration, the rigidity against the twisting force acting on the gear box portion 4c is enhanced.

Furthermore, in the present embodiment, the beam-shaped rigid member 53 is installed between the mounting portion 48 and the engine body 1, so that the Rishorum compressor 4 is joined to the support brackets 25 and 26. The load is prevented from acting on the intake manifold 3 by swinging to the side of the engine body 1 about the fulcrum.

The invention of the present application is not limited to the configuration of the above-described embodiment, and it goes without saying that the design can be appropriately changed without departing from the scope of the invention.

[Brief description of drawings]

FIG. 1 is a front view showing an intake device of an engine with a mechanical supercharger according to an embodiment of the present invention.

FIG. 2 is a side view showing an intake device of an engine with a mechanical supercharger according to an embodiment of the present invention.

FIG. 3 is a plan view showing an intake device of an engine with a mechanical supercharger according to an embodiment of the present invention.

FIG. 4 is a side view showing the mounting structure of the Rishorum compressor in the intake device of the engine with the mechanical supercharger according to the embodiment of the present invention.

FIG. 5 is a sectional view taken along line VV of FIG. 4;

FIG. 6 is a front view showing a mounting structure of the Rishorum compressor in the intake system of the engine with the mechanical supercharger according to the embodiment of the present invention.

[Explanation of symbols]

Reference numeral 1 is an engine body, 2 is a cylinder head, 3 is an intake manifold, 3a is an inclined portion (branch pipe), 4 is a mechanical supercharger (Rishorum compressor), 5 and 6 are rotor shafts, 9 is a surge tank, 13 Is an oil filter, 1
4 is a starter, 15 is a male rotor, 16 is a female rotor, 18
Is the crankshaft and S is the space.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Koji Kimura, 3-1, Shinchi Fuchu-cho, Aki-gun, Hiroshima Prefecture Mazda Co., Ltd. (72) Shinya Miyahara, 3-1-1 Shinchu, Fuchu-cho, Hiroshima Prefecture Mazda Corporation (72) Inventor Kenji Sasaki 3-1, Shinchi Fuchu-cho, Aki-gun, Hiroshima Mazda Motor Corporation

Claims (5)

[Claims] 1. A mechanical supercharger having two rotor shafts is provided at a position below an intake manifold connected to a cylinder head at a side of an engine body so that both rotor shafts are substantially parallel to a crankshaft. And an intake device for an engine with a mechanical supercharger configured to supply intake air into the engine body via the mechanical supercharger, wherein the intake manifold is provided with respect to a cylinder head. The mechanical supercharger is arranged such that the line connecting the two rotor shafts is in substantially the same direction as the inclined portion of the intake manifold. The uppermost end of the mechanical supercharger is located above the lower end of the intake manifold connected to the cylinder head and below the inclined portion above the lower end of the connection. An air intake device for an engine with a mechanical supercharger, which is characterized by being tightened. 2. The intake system for an engine with a mechanical supercharger according to claim 1, wherein the mechanical supercharger is a Lishorum compressor. 3. In the mechanical supercharger, the rotor shaft for the male rotor of the two rotor shafts is located close to the engine body, and the rotor shaft for the female rotor is located away from the engine body. The intake device for an engine with a mechanical supercharger according to claim 2, characterized in that the intake device is arranged in a biased posture. 4. The oil filter is attached to the side of the engine body below the mechanical supercharger, and the oil filter is attached to the engine supercharger. An intake device for an engine with a mechanical supercharger according to the item. 5. The starter is installed at a side of the engine body below the mechanical supercharger, and the starter is attached to the engine supercharger. An intake device for an engine with the described mechanical supercharger.