JP2003049726A - Intake system for engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compact intake system to be arranged on the upper side of an engine, and easy to be module-constructed. SOLUTION: A throttle box 31 is mounted and supported on the upper side of the engine 70 via intake manifolds 50, 55 and a cleaner case 10 is joined to the throttle box 31 at almost the same height as that of the throttle box 31. Upstream ends 51b, 52b and 56b, 57b of intake pipes 51, 52, 56, 57 are arranged up and down in parallel to each other and opened to the cleaner case 10. A throttle 43 is arranged with its center axis S approximately horizontal and extended toward a vertical center between the upstream ends 51b, 52b and 56, 57b.

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, and more particularly to an intake system for an engine mounted on a vehicle.

[0002]

2. Description of the Related Art In a conventional intake system, a throttle and an air flow meter or an air cleaner case are connected by a duct in an engine room, and an air cleaner case is connected to a vehicle body. In such an air intake device, since the air cleaner case is attached to the vehicle body side, a large space for arranging the air intake device through the duct from the air cleaner case to the engine is required, and the air conditioner in the engine room is required. It took a lot of man-hours to design the layout of each part. In addition, it is necessary to design each part in accordance with the effective space and shape in the engine room, which varies depending on the type of vehicle, which makes it difficult to standardize each part, that is, modularize it.

As a countermeasure against this, for example, Japanese Unexamined Patent Publication No. 8-33.
As disclosed in Japanese Patent No. 4070 and shown in FIG. 21, an intake device is provided with an air cleaner case 110 including an air cleaner cap 112 and a dirty side case 111 provided adjacent to a cylinder head of the engine 100, and an engine 100 of the air cleaner case 110. A throttle 140 that is provided on the opposite side and connects the surge tank 130 including a surge tank cap 132 and a lower case 131 to the air cleaner case 110, and an upper side that extends from the surge tank 130 below the air cleaner case 110 to the intake port of the engine 100. The intake manifold 120 is formed in a tubular shape by the wall surface 121 and the lower side wall surface 122. As shown in FIG. 22, the dirty side case 111 of the air cleaner case 110 and the intake manifold 12 are formed. Of the upper wall 121, the surge tank 1
The thirty lower cases 131 are integrally formed of resin as the housing 101, and the upper wall surface 121 is shared as the bottom surface of the dirty side case 111 and the bottom surface of the lower case 131.

The air cleaner case 110, the throttle 140, the surge tank 130 and the intake manifold 120 are unitized and assembled to form an intake device, and the intake device is used as a unit for the engine 10.
It is proposed to assemble to 0.

Further, as disclosed in Japanese Patent Laid-Open No. 10-318056 and shown in FIG. 23, the air element 1
An air cleaner case 153 for accommodating 52, a throttle 154 into which air that has passed through the air cleaner case 153 is introduced, and an intake manifold 155 that guides the air that has passed through the throttle 154 to the engine 100 side,
A case bottom 162 that is integrally formed with a part 156 of the intake manifold 155 in the air cleaner case 153, a case middle 163 that is detachably combined with the case bottom 162 and that houses the air element 152 inside, An air intake device has been proposed that includes a case lid 161 that is detachably combined with the intermediate portion 163 to close the opening of the air cleaner case 153.

[0006]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
According to Japanese Patent Laid-Open No. 070 and Japanese Patent Application Laid-Open No. 10-318056, the intake device from the air cleaner case to the intake manifold is unitized, and this intake device is attached to the engine as a unit, so that the entire intake device is integrated in the vicinity of the engine. Space in the engine room and installation design of each part in the engine room becomes easy.

However, since the air cleaner case, the throttle and the like are arranged above the intake manifold joined to the engine, the height of the intake device becomes large,
The clearance between the intake device and the hood covering the engine room is limited. As a result, due to contact with pedestrians,
When a pedestrian exerts an impact load on the hood from above, deformation of the hood is limited by the intake device, and there is a concern that impact energy absorption or impact relaxation due to deformation of the hood may be affected. On the other hand, if the hood is raised to secure a sufficient crash stroke, the driver's visibility and running resistance are affected, and the degree of freedom in vehicle body design is restricted.

Therefore, an object of the present invention made in view of the above points is to provide an intake device which is arranged above an engine, such as a horizontally opposed engine or a V-type engine, and which is compact and easy to be modularized. Especially.

[0009]

According to another aspect of the present invention, there is provided an air intake system for an engine, wherein air passing through a cleaner case for accommodating an air element is introduced into a throttle box through a throttle. In an engine intake device that distributes from a throttle box to each cylinder of an engine by an intake manifold, the throttle box is mounted and supported on an upper surface of the engine through the intake manifolds that are respectively joined to opposite side surface portions of the throttle box. , The above cleaner case is
The intake manifold is joined to the throttle box, and the intake manifolds are vertically arranged on opposite side surfaces of the throttle box so that an upstream end is open and a lower end is joined to each intake port of the engine. The throttle has a plurality of intake pipes, and the throttle is disposed at the vertical center between the upstream end portions of the intake pipes arranged vertically with the central axis of the throttle being substantially horizontal and on the both side surfaces. And is disposed in the throttle box so as to extend toward the center between the upstream end portions facing each other.

According to the first aspect of the present invention, the central axis of the throttle is substantially horizontal and is arranged so as to face the center in the vertical direction between the upstream end portions of the intake pipes and the center between the opposed upstream end portions. As a result, turbulent air flow in the throttle box is suppressed and the air is supplied to each intake pipe in a balanced manner, and air is introduced into the throttle box from a substantially horizontal direction, so the height of the part is suppressed. In addition, the height of the cleaner case can be effectively and easily suppressed. Further, by connecting the throttle box and the cleaner case, a duct or the like is not required, and the intake device can be made compact.

As a result, when the hood is mounted in the engine room, a clearance between the hood and the intake device can be easily secured, and if a pedestrian or the like applies an impact load to the hood from above. Also, the crush stroke of the hood can be secured, the impact energy can be absorbed or the impact can be relieved due to the deformation of the hood, and the safety for pedestrians can be improved. On the other hand, a so-called slant nose, which lowers the hood without being affected by the intake device, becomes possible, and it is expected that the driver's visibility can be secured and running resistance can be reduced, and the degree of freedom in vehicle body design can be expanded.

[0012] Further, the throttle box and the cleaner case can be attached to the engine through the intake manifold as a unit that is joined in advance, and the manufacturing efficiency can be improved, and the intake system can be made compact. This makes it easier to install in other vehicle models where the shape and effective space of the engine room are limited, and modularization of the intake system becomes easier.

According to a second aspect of the present invention, in the engine intake system of the first aspect, the cleaner case has an air cleaner case for accommodating the air element and a main port for introducing air from the air cleaner case to the throttle. An intake system passage from the throttle including the main port to the air element is arranged in a substantially straight line on an extension of the central axis of the throttle.

According to the present invention, by arranging the intake system passage from the throttle to the air element in a straight line on the extension line of the central axis of the throttle extending substantially horizontally, the air cleaner is connected to the throttle via the main port. Intake resistance to reach is reduced, and the height of the air cleaner case can be effectively suppressed.

According to a third aspect of the present invention, in the engine air intake system according to the first or second aspect, the cleaner case has a lower portion of an air cleaner case that accommodates the air element and an upper portion of the air cleaner case that is open, and an upper portion of the blower bypass. A cleaner case main body whose lower chamber is integrally formed of a resin partitioned by a partition wall, and a case cover whose upper part of the air cleaner case lower part and upper part of the blow-by chamber are integrally molded with resin to close the upper part of the blower chamber lower part. By joining the cleaner case body and the case cover, a hollow cleaner case for housing an air element is formed by the air cleaner case lower part and the air cleaner case upper part,
A blow-by chamber of the blow-by gas recirculation system is formed by the lower portion of the blow-by chamber and the upper portion of the blow-by chamber.

According to the third aspect of the present invention, the cleaner case body and the case cover, which are formed by resin integral molding, which are excellent in moldability and can be made lightweight, are compact in that the air cleaner case for housing the air element and the blow-by chamber are adjacent to each other. A simple cleaner case can be easily manufactured, and the manufacturing cost can be suppressed. Further, when the pedestrian exerts an impact load on the hood from above due to contact with the pedestrian or the like, the cleaner case that may come into contact with the hood due to the deformation of the hood is formed of a relatively easily deformable resin. Therefore, the safety for pedestrians and the like is improved.

According to a fourth aspect of the present invention, in the engine intake device according to the third aspect, the cleaner case body is
Further, a main port is formed integrally with the resin so as to penetrate the inside of the blow-by chamber from the lower part of the air cleaner case and introduce the air from the inside of the air cleaner case to the throttle.

According to the present invention, the blow-by chamber is formed between the air cleaner case and the throttle box by providing the main port penetrating the blow-by chamber and projecting from the air cleaner case. You can get a compact cleaner case with all the port functions.

According to a fifth aspect of the invention, in the engine air intake system according to the third or fourth aspect, an air flow meter mounting member for supporting the air flow meter is disposed on either the cleaner case body or the case cover. It is characterized by that.

According to the invention of claim 5, the air flow meter can be easily arranged in the cleaner case by disposing the air flow meter mounting member in the cleaner case body or the case cover.

According to a sixth aspect of the present invention, in the intake system for an engine according to any of the first to fifth aspects, the intake manifold is a pair of intake manifolds that are individually joined to the side surfaces of the throttle box. It is characterized by being divided into.

According to the sixth aspect of the present invention, since the intake manifold is joined to the throttle box, it is possible to join different intake manifolds to the throttle box depending on the requirements of specifications such as engine performance.
In other words, the throttle box can be commonly used for various engines. Further, by dividing the intake manifold, the intake manifold can be miniaturized, and the molding die for molding the intake manifold can be miniaturized, which can be expected to reduce the manufacturing cost. Further, by making the intake manifolds have the same structure, it is possible to reduce the number of types of components and further improve the productivity.

According to a seventh aspect of the invention, in the engine air intake system of the first aspect, an intercooler is joined to the throttle box at substantially the same height as the throttle box instead of the cleaner case. .

According to the seventh aspect of the present invention, by connecting the intercooler to the throttle box instead of the cleaner case, the throttle box and the intake manifold can be shared even with a turbo engine.

[0025]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of an intake system for an engine according to the present invention will be described below with reference to the drawings by taking an example of a horizontally opposed four cylinder engine.

(First Embodiment) FIG. 1 shows the first embodiment.
It will be described with reference to FIG. 1 is an overall perspective view showing a state in which the intake device is attached to the engine, FIG. 2 is a side view from the direction of arrow A in FIG. 1, FIG. 3 is an overall perspective view of the intake device, and FIG. 4 is an exploded view of FIG. FIG. 5 is a perspective view, and FIG. 5 is a sectional view taken along line I-I of FIG. The arrow F indicates the front direction of the vehicle body.

As shown in FIGS. 1 to 5, the intake device 1 is
The cleaner case main body 11A and the case cover 11B are integrally formed to form a cleaner case 10, a throttle box assembly 30 in which a pair of intake manifolds 50 and 55 are connected to a throttle box 31, a throttle 43 and the like.

Next, the structure of each part will be described in detail. The cleaner case body 11A is made of resin, and is a plan view in FIG. 6, a view in the arrow B of FIG. 6, a view in the arrow C of FIG. 6, and a line II-II in FIG. As shown in each of the line cross-sectional views, the inside of the peripheral wall 12 is divided into front and rear by a partition wall 13 to form an air cleaner case lower portion 15A and an blower chamber lower portion 20A which are open at the upper side adjacently to each other. A connecting portion 28 having a substantially rectangular cross section is integrally extended via 12.

A half-split air inlet lower portion 16A extends from one end of the air cleaner case lower portion 15A, and the upper surfaces of the partition wall 13 and the peripheral wall 12 face each other in an arcuate shape in the vehicle width direction so as to face each other in the air cleaner case lower portion 15A. The extending air element support portions 17a and 17b are bulged. The rear end of the partition wall 13 opens to the lower portion 15A of the air cleaner case, and the lower portion 20A of the blow-by chamber is opened.
A cylindrical main port 18 is provided so as to penetrate therethrough.

The bottom portion 21 of the blow-by chamber lower portion 20A has a mountain-shaped cross section which is inclined from the center in the front-rear direction to the front and the rear, and therefore is inclined downward. It is open. Further, a plurality of separators 23a are erected on the bottom portion 21 and the partition wall 13 or the peripheral wall 12. The main port 18 is provided with a fresh air introduction hole 24 that connects the inside of the air cleaner case lower portion 15A and the inside of the blow-by chamber lower portion 20A.

On the other hand, the case cover 11B is made of resin, and FIG. 10 is a bottom view, FIG. 11 is a side view from the direction of arrow D in FIG. 10, and FIG. 12 is a sectional view taken along the line III-III in FIG. Thus, the air cleaner case lower part 15A, the blow-by chamber lower part 20A and the air inlet lower part 16A of the cleaner case main body 11A are covered with their peripheral edges being in close contact with the peripheral wall 12 of the cleaner case main body 11A and the upper end edges of the air inlet lower part 16A, and the air cleaner case Bottom 1
5A, the blow-by chamber lower part 20A and the air inlet lower part 16A respectively corresponding to the air cleaner case upper part 15B,
Blow-by chamber upper part 20B and air inlet upper part 16B
Are integrally formed.

The upper portion 15B of the air cleaner case faces the lower portion 15A of the air cleaner case, and the air element support portion 1 formed on the lower portion 15A of the air cleaner case.
Corresponding to 7a and 17b, air element holding portions 17c and 17d each having a circular arc-shaped tip are provided in a protruding manner.

The blow-by chamber upper portion 20B faces the blow-by chamber lower portion 20A, and a plurality of separators 23b that can be inserted between the separators 23a formed in the blow-by chamber lower portion 20A are provided on the lower surface side so as to project.

The cleaner case body 11A and the case cover 11B formed in this manner are opposed to each other and the connecting portions 11a and 11b are bolted together, and the air inlet lower portion 16A and the air inlet upper portion 16B are connected by a clip or the like. In the cleaner case 10 formed in a hollow shape, a hollow air cleaner case 15 is formed by an air cleaner case lower portion 15A and an air cleaner case upper portion 15B, and a cylindrical air cleaner case 15 communicated with the air cleaner case 15 by an air inlet lower portion 16A and an air inlet upper portion 16B. The air inlet 16 is formed. Further, the air element support portion 17 protruding from the cleaner case body 11A
a, 17b and the air element holding portions 17c, 17d projectingly provided on the case cover 11B.
9 is held in the intended position. In addition, the lower part 2 of the blow-by chamber
The blow-by chamber 2 having a fresh air introduction hole 24 that is formed in a labyrinth shape by the separators 23a and 23b by the 0A and the upper portion 20B of the blow-by chamber and has connection holes 22a and 22b at both end portions thereof and the main port 18 is opened.
0 is formed.

A mounting hole 25 for mounting an air flow meter mounting member 49 for supporting an air flow meter (not shown) is formed on the lower surface of the main port 18. By disposing the air flow meter mounting member 49 in the cleaner case body 11A, the air flow meter can be easily arranged in the cleaner case 10.

Therefore, according to the cleaner case 10, the air cleaner case 15 and the blow-by chamber 20 are adjacent to each other in the front-rear direction by penetrating the inside of the peripheral wall 12 by the partition wall 13 of the supply, and penetrate the inside of the blow-by chamber 20 to penetrate the main port 18. Combined with the fact that the air cleaner case 1 is integrally formed, the height and the length in the front-back direction are suppressed.
5 and the blow-by chamber 20 are formed as a compact unit.

The cleaner case body 11A and the case cover 11B forming the cleaner case 10 can be easily and inexpensively manufactured by integral molding using a resin having excellent moldability. The cleaner case body 11A includes an air cleaner case lower portion 15A, a blow-by chamber lower portion 16A, and an air inlet lower portion 16A which are integrally formed in advance.
The connecting portion 28 and the connecting portion 28 are formed in advance as separate parts, and then joined together by vibration welding, whereby the forming is facilitated, and the manufacturing cost can be suppressed by simplifying the size and shape of the forming die. .

On the other hand, the throttle box 31 has a throttle box body 32 and a partition wall 40. The throttle box main body 32 is shown in a cross-sectional view in FIG. 5 and in a perspective view in a state where intake manifolds 50, 55 described later are assembled in FIG. 13, as shown in the upper surface portion 33, the front surface portion 34, the lower surface portion 35 and both sides. It has a box shape formed by the surface portions 36 and 37 and has a rear side opening, and both side surface portions 36 and 37 have mounting openings 36a (the mounting opening portion of the side surface portion 37 is not shown). Furthermore, the lower surface part 3
A blow-by gas introduction hole 38 is formed in a central portion of the cylinder 5 so as to project in a cylindrical shape.

As shown in FIGS. 5 and 14, the partition wall 40 is shaped so as to fit into an opening 39 formed in the rear of the throttle box main body 32 to close the throttle box main body 32, and has a central portion. The throttle mounting hole 41 is opened, and one end of the throttle body 44 of the throttle 43 is mounted in the throttle mounting hole 41 by a mounting member 46 and a mounting bolt 47.

Opening 39 of the throttle box body 32
The ends of the connecting portions 28 formed on the cleaner case main body 11A are joined together and joined by a clip (not shown). The other end of the throttle body 44 is connected to the tip of the main port 18 by a tubular joining member 48. By joining the throttle box 31 and the main port 18, the air element 19, the main port 18, and the throttle 43 arranged in the air cleaner case 15 are arranged substantially horizontally and substantially coaxially. That is, on the extension of the central axis S of the throttle 43, the main port 1
The intake system path from the throttle 43 including 8 to the air element 18 is linearly arranged, and the upper surfaces of the throttle box 31, the connecting portion 28, the blow-by chamber 20 and the air cleaner case 15 are continuously formed at substantially the same height. It

Both sides 3 of the throttle box body 32
Intake manifolds 50 and 55 are joined to 6 and 37, respectively. Regarding the intake manifold 50 provided on the side surface portion 36 side, a perspective view of the intake manifold 50 assembled to the throttle box body 32 shown in FIG. 13 and the intake manifold 5
This will be described with reference to FIGS.

The intake manifold 50 is made of metal or resin having excellent heat resistance, such as aluminum alloy, and has a pair of intake pipes 51 and 52 and the intake pipes 51 and 52.
Of the intake pipes 51 and 52, and a downstream mounting flange 53 for connecting the downstream end portions 51a and 52a of the intake pipe 51a and 52a to each other and joining to the intake port of the engine 70.
b and 52b are connected to each other and the side surface portion 36
The upstream side mounting flange 54 for coupling with the above is formed by integral casting or resin molding, for example, by die casting.

The downstream mounting flange 53 is formed on the upper surface of the engine 70 and is long in the front-rear direction so that it can come into contact with the mounting surface where the intake port is open from above, and has a plurality of bolt holes 53a for bolting to the engine 70. The downstream end portion 51a of the intake pipe 51 is arranged in front of the downstream end portion 52a of the intake pipe 52 and is joined so as to correspond to each intake port.

The upstream side mounting flange 54 is attached to the side surface portion 36 of the throttle box main body 32 from the outside by a mounting opening portion 36.
Mounting flange main body 5 whose peripheral portion is in contact with the periphery of a
4A and a mounting flange main body 54A, and a fitting portion 54B protruding from the mounting flange main body 54A to fit into the mounting opening portion 36a. The intake pipe 52 is arranged below the intake pipe 51.
The vicinity of the upstream end portions 51b and 52b of No. 2 is joined.

The upstream end portions 51b of the intake pipes 51 and 52,
The reference numeral 52b is substantially parallel to the inside of the throttle box 31 and protrudes from the upstream side mounting flange 54 so that the intake pipe 52 is arranged below the intake pipe 51, and has a bell mouth shape to reduce air resistance of intake air. It is open to. The upstream end portion 52b of the intake pipe 52 has a larger amount of protrusion from the upstream side mounting flange 54 into the throttle box 31 than the upstream end portion 51b of the intake pipe 51, and the intake pipes 51 and 52 are curved downward. The effective pipe lengths of are set to be approximately equal.

On the other hand, the intake manifold 55 provided on the side surface 37 side is shown in FIG.
As shown in FIG.
7 and the downstream end portions 56a and 57 of the intake pipes 56 and 57, respectively.
a downstream side mounting flange 58 for connecting a to each other and joining to an intake port of the engine 70, and an intake pipe 56.
, 57 are integrally formed with an upstream side mounting flange 59 for connecting the vicinity of the upstream side end portions 56b and 57b to each other and for connecting to the side surface portion 37.

The downstream side mounting flange 58 is long in the front-rear direction so that it can come into contact with the mounting surface where the intake port of the engine 70 is open from above, and a plurality of bolt holes 58a for bolting to the engine 70 are provided. The downstream end 57a of the intake pipe 57 is arranged in front of and connected to the downstream end 56a of the intake pipe 56 so as to correspond to each intake port.

On the other hand, the upstream side mounting flange 59 is mounted on the side surface portion 37 of the throttle box main body 32 from the outside along the peripheral edge of the mounting opening, and the peripheral portion thereof faces the mounting flange body 5.
9A and a fitting portion (not shown) protruding from the mounting flange main body 59A and fitted into the mounting opening, the intake pipe 5
An intake pipe 57 is arranged on the lower side of 6, and the vicinity of the upstream end portions 56b and 57b of the intake pipes 56 and 57 are joined.

Upstream end portions 56b of the intake pipes 56 and 57,
The intake pipe 57b is provided so that the intake pipe 57 is disposed substantially parallel to the inside of the throttle box 31 from the upstream side mounting flange 59 and below the intake pipe 56 so as to project and open in a bell mouth shape. The upstream end 57b of the intake pipe 57 has a larger protrusion amount from the upstream mounting flange 59 into the throttle box 31 than the upstream end 56b of the intake pipe 56, and the intake pipes 56 and 57 are set to have substantially equal pipe lengths. There is.

Intake pipe 5 of these intake manifolds 50
1 and 52 upstream end portions 51b and 52b, and intake manifold 55 intake pipes 56 and 57 upstream end portions 56b.
And 57b are opened to face each other in the throttle box 31, and the throttle 43 has a central axis S of the throttle 43 which is substantially horizontal and has upstream end portions 51b and 52b of the intake pipes 51, 52, 56 and 57, respectively. Upstream end portions 51b and 56b, 56b and 57b, which are vertically centered and are opposed to each other,
The partition wall 4 extends toward the central position between 2b and 57b.
It is set to 0.

That is, the intake air is guided from the cleaner case 10 through the main port 18 and the throttle 43 in a substantially horizontal and linear manner so that the intake resistance is small and is smoothly introduced.
Further, in the throttle box 31, the throttle 43 and the upstream end portions 51b, 52 of the intake pipes 51, 52, 56, 57.
b, 56b, and 57b are set to a substantially constant distance, and intake to each cylinder of the horizontally opposed four-cylinder engine is repeated, for example, in the order of intake pipes 51, 52, 56, and 57 in the throttle box 31. The turbulent flow is suppressed, the intake cylinder interference effect can be effectively avoided, and intake air can be supplied to each intake pipe 51, 52, 56, 57 in a balanced manner.

The throttle box 31 and the intake manifold 50 are joined to each other by a mounting opening 36a which is opened in the side surface 36 of the throttle box main body 32 which is formed in advance.
From the outside to the upstream end portions 51b, 52 of the intake pipes 52, 53.
b and the fitting portion 5 of the upstream side mounting flange 54
4B is fitted in the mounting opening 36a, and the mounting flange main body 54A is pressure-contacted to the side surface portion 36 to easily join them by ultrasonic vibration welding for applying vibration. Similarly, the upstream end portions 56b and 57b of the intake pipes 56 and 57 are inserted from the outside into the mounting opening portion of the side surface portion 37, the fitting portion of the upstream mounting flange 59 is fitted, and the mounting flange body 5
4A can be easily joined by ultrasonic vibration welding in which 4A is brought into pressure contact with the side surface portion 36 to impart vibration. Further, since the intake manifolds 50 and 55 are configured separately, the intake manifolds 50 and 55 are formed relatively compact, and the manufacturing die can be downsized, and the manufacturing cost can be reduced.

Further, it is possible to form the intake manifolds 50 and 55 in the same shape and to attach them to the side surfaces 36 and 37 of the throttle box main body 32 in a reversed state. In this case, the intake manifolds 50 and 55 are provided.
It is possible to share the same type, it is possible to share the manufacturing type and the like, it is possible to reduce the manufacturing cost, and it is possible to suppress the increase in the types of separate components and improve the productivity. Further, the intake manifolds 50, 55 are attached to the throttle box body 32.
Since the above are joined, it is also possible to join the intake manifold (not shown) having a different shape to the throttle box 31 depending on the requirements of the engine performance and the like. In other words, the throttle box 31 and the cleaner case 10 can be commonly used for various engines.

Next, the blow-by gas recirculation system is shown in FIG.
This will be described with reference to the exploded perspective view shown in FIG. 7 and the schematic view shown in FIG.

As shown in FIG. 17, the crankcase 71
A blow-by hose 62 communicates with a blow-by gas delivery hole 73 formed in the center of the upper part of the engine and a blow-by gas introduction hole 38 formed in the throttle box body 32 via a PCV valve 61, and a crankcase of the engine 70. 71 and connection holes 22a and 22b opened at both end portions of the blow-by chamber lower portion 20A are connected by fresh air hoses 63a and 63b, respectively.

In the blowby gas recirculation system thus formed, as shown in the schematic view of FIG. 17, the crankcase 71 and the throttle box 31 are connected by the PCV valve 61 and the blowby hose 62, and the piston and the cylinder are connected. Crank case 7 from the wall gap
The blow-by gas leaking into 1 is recirculated in the throttle box 31 by the intake pressure of the intake system, that is, the blow-by gas amount corresponding to the negative pressure in the throttle box 31, and the intake manifold 5 from the throttle box 31.
It is supplied to the intake port together with the fresh air introduced from the throttle 43 through 0 and 55, and is reburned.

On the other hand, the fresh air in the air cleaner case 15 is introduced into the blow-by chamber 20 through the fresh-air introduction hole 24 opening to the main port 18, and the separators 23a and 23b forming the inside of the blow-by chamber 20 in a maze form moisture and water. Foreign matter such as dust is separated and removed, and pulsation is suppressed, and the discharge hole 22
The air is supplied to the inside of the crankcase 71 from a and 22b through the fresh air hoses 63a and 63b, and the inside of the crankcase 71 is maintained at the atmospheric pressure by the fresh air and ventilation is performed.
The fresh air introduction hole 24 is provided in place of the main port 18 instead of the air cleaner case lower portion 15A and the blow-by chamber lower portion 2A.
The partition wall 13 may be provided so as to communicate with 0A.

Therefore, the intake device 1 thus constructed
According to the above, since the air is introduced into the throttle box 31 from a substantially horizontal direction, the height of the portion can be suppressed without disposing the throttle or the like above the throttle box 31, and the main portion from the throttle 43 can be suppressed. Coupled with the fact that the air element 19 in the air cleaner case 15 is arranged substantially horizontally and linearly via the port 18, the cleaner case 10 can be easily attached to the throttle box 3.
The height of the intake device can be substantially the same as the height of the intake device 1, and the duct for connecting the throttle box 31 and the cleaner case 10 can be eliminated.

Further, the inside of the hollow portion formed by the cleaner case body 11A and the case cover 11B is partitioned by the partition wall 13 to integrally form the air cleaner case 15 and the blow-by chamber 20 in the front-rear direction, and the main port 18 is formed. Since the blow-by chamber 20 is integrally formed by penetrating the blow-by chamber 20, the height and the length in the front-back direction are suppressed, and the air cleaner 15, the blow-by chamber 20, and the main port 18 are integrally formed as a unitized cleaner. The case 10 and the side surface portion 3 of the throttle box 31
The intake device 1 is formed as a unit by joining the intake manifolds 50 and 55 to 6, 37 and the unitized throttle box assembly 30, and the intake device 1 can be compactly attached to the engine 70. Efficiency can be obtained. Further, the air cleaner case 15, the blow-by chamber 20 and the throttle box 31 extend in the front-rear direction and are continuously arranged to suppress the dimension in the height direction. As shown in FIG.
It is possible to secure a sufficient clearance L between 0 and the intake device 1.

Further, the intake device 1 excluding the air cleaner case 15, the blow-by chamber 20, the throttle 43 such as the throttle box 31 and the intake manifolds 50, 55.
Since the main part of the is made of resin, it is lightweight and easy to mold, and it can be expected to reduce the manufacturing cost, and the function of the intake device 1 can be reasonably integrated, which is compact and the shape of the engine room. Also, it becomes easy to install in other vehicle models whose effective space is limited, and it is excellent in versatility and modularization of the intake device 1 becomes easy.

Even if a pedestrian or the like applies an impact load to the hood 80 from above, the crush stroke of the hood 80 can be secured, and the impact energy can be absorbed or the impact can be relieved due to the deformation of the hood 80. Along with the fact that the case body 11A, the case cover 11B, and the throttle box 31 of the intake device 1 that may come into contact with the hood 80 are formed of resin having relatively elasticity, the safety for pedestrians is improved. To do.
On the other hand, a so-called slant nose, which lowers the hood 80, becomes possible, and it is expected that the driver's field of view is secured and the traveling resistance is reduced, and the degree of freedom in vehicle body design is expanded.

(Second Embodiment) Next, a second embodiment of the present invention will be described with reference to FIG. It is to be noted that in FIG. 19, portions corresponding to those in FIGS. 1 to 18 are denoted by the same reference numerals to omit detailed description of the portions, and different portions will be mainly described.

FIG. 19 is a schematic view of the blow-by gas recirculation system corresponding to FIG.
A partition wall 65 divides the inside into a first blow-by chamber 66 and a second blow-by chamber 68.

The first blow-by chamber 66 has a blow-by gas delivery hole 73 formed in the crankcase 71 and a connection hole 2.
2a communicates with the blow-by hose 62 via the PCV valve 61, and the blow-by hose 67 connects the blow-by gas lead-out hole 67a opening to the peripheral wall 12 and the blow-by gas introducing hole 67b opening to the partition wall 40 with the throttle box. It communicates with the inside of 31.

On the other hand, the second blow-by chamber 68 communicates with the inside of the air cleaner case 15 through a fresh air introduction hole 68a formed in the partition wall 13, and has one end connected to the connection hole 22b and the other end branched to form the crank case 71. It connects with the crankcase 71 by the fresh air hose 69 connected to.

The blow-by gas leaked into the crankcase 71 through the gap between the piston and the cylinder wall is
The blow-by hose 67 is introduced into the first blow-by chamber 66 from the connection hole 22a through the PCV valve 61 and the blow-by hose 62, and the separators 23a and 23b suppress the separation and removal of foreign matter such as oil and water and the pulsation.
Is recirculated from the throttle box 31 into the throttle box 31 and is supplied to the intake port together with the fresh air introduced from the throttle 43 through the intake manifolds 50 and 55 to be reburned.

On the other hand, fresh air is introduced from the inside of the air cleaner case 15 into the second blow-by chamber 68 through the fresh-air introducing hole 68a, and water drops and dust are generated by the separators 23a and 23b forming a labyrinth inside the second blow-by chamber 68. The foreign matter such as is separated and removed and the pulsation is suppressed and supplied from the discharge hole 22b into the crankcase 71 of the engine 70 through the fresh air hose 69 to maintain the inside of the crankcase 71 at the atmospheric pressure and perform ventilation. Be seen. In addition, this fresh air introduction hole 68a
In place of the partition wall 13, an opening can be formed in the main boat 18 as in the first embodiment.

(Third Embodiment) Next, a third embodiment of the present invention will be described with reference to FIG. FIG. 20 is an overall perspective view showing an outline of an intake device for a turbo engine,
20. In FIG. 20, parts corresponding to those in FIGS. 1 to 18 are designated by the same reference numerals to omit detailed description of the parts, and different parts will be mainly described.

The engine 70 as in the first embodiment described above.
A throttle box 31 is attached and supported on the upper surface side of the above through intake manifolds 50 and 55. In the throttle 43 attached to the partition wall 40 of the throttle box 31, a substantially rectangular box-shaped intercooler 75 is arranged at substantially the same height as the throttle box 31 in place of the cleaner case 10 of the first embodiment. Intake air that is supplied via the turbocharger (not shown) is cooled and supplied from the throttle 43 to the throttle box 31, and the intake manifolds 50 and 55 supply fresh air to the intake ports of the engine 70. Is configured to introduce.

With this configuration, the throttle box 31, the intake manifolds 50, 55, etc. of the first embodiment can be shared, and the throttle box 31 and the intercooler 75 are arranged in a row at substantially the same height. Therefore, the height can be suppressed.

The present invention is not limited to the above-mentioned embodiments, but various modifications can be made without departing from the spirit of the present invention. For example, in each of the above-mentioned embodiments, the intake device has been described for the horizontally opposed engine, but it can be applied to the intake device for a V-type engine. Further, in the above-described embodiment, the air flow meter mounting member 49 that supports the air flow meter is arranged on the cleaner case main body 11A, but the air flow meter mounting member 49 can be arranged on the case cover 11B side.

[0072]

According to the engine intake system of the present invention described above, the air that has passed through the cleaner case that accommodates the air element is introduced into the throttle box through the throttle, and each cylinder of the engine is introduced from the throttle box by the intake manifold. In the intake system of the engine, the central axis of the throttle is substantially horizontal and is arranged so as to face the vertical center between the upstream ends of the intake pipes and the center between the opposing upstream ends. Intake efficiency of each cylinder can be secured, and since air is introduced into the throttle box from the side, the height of the portion can be suppressed and the height of the cleaner case can be effectively suppressed. As a result, the clearance between the hood and the air intake device can be easily secured, and the impact energy can be absorbed or the impact can be relieved due to the deformation of the hood, and the safety for pedestrians can be improved.

Further, the throttle box mounted and supported above the engine by the intake manifold can be attached to the engine as a unit in which the throttle box and the cleaner case are pre-joined to each other, so that the manufacturing efficiency can be improved and the intake Combined with the fact that the device can be made compact, it can be easily mounted on other vehicle models where the shape and effective space of the engine room are limited, and the versatility is excellent and modularization of the intake device is facilitated.

[Brief description of drawings]

FIG. 1 is an overall perspective view showing a state in which an intake device is attached to an engine, showing an outline of a first embodiment of an intake device for an engine according to the present invention.

FIG. 2 is likewise a side view from the direction of arrow A in FIG.

FIG. 3 is likewise an overall perspective view of the intake device.

FIG. 4 is likewise an exploded perspective view of FIG.

5 is a sectional view taken along line I-I of FIG.

FIG. 6 is a plan view of the cleaner case body.

FIG. 7 is likewise a view as seen in the direction of arrow B in FIG.

FIG. 8 is likewise a view taken in the direction of arrow C in FIG.

9 is a sectional view taken along line II-II of FIG.

FIG. 10 is also a bottom view of the case cover.

FIG. 11 is likewise a view taken in the direction of arrow D in FIG. 10.

12 is a sectional view taken along line III-III of FIG.

FIG. 13 is likewise a perspective view showing a state in which the throttle box body and the intake manifold are assembled.

FIG. 14 is likewise a perspective view showing a joined state of the throttle box and the throttle.

FIG. 15 is likewise a perspective view of the intake manifold.

FIG. 16 is likewise a perspective view of the intake manifold.

FIG. 17 is likewise an exploded perspective view showing an outline of a blow-by gas circulation system.

FIG. 18 is also a schematic diagram showing an outline of a blow-by gas recirculation system.

FIG. 19 is a schematic diagram of a blow-by gas recirculation system showing an outline of a second embodiment of an engine intake device according to the present invention.

FIG. 20 is an overall perspective view showing a state in which an intake device is attached to the engine, showing an outline of a third embodiment of the intake device for the engine according to the present invention.

FIG. 21 is a side view showing an outline of a conventional intake device.

22 is likewise an exploded perspective view of FIG. 21.

FIG. 23 is a side view showing an outline of a conventional intake device.

[Explanation of symbols]

1 Air intake device 10 cleaner case 11A cleaner case body 11B case cover 13 partitions 15 Air cleaner case 15A Air cleaner case bottom 15B Air cleaner case upper part 16 air inlet 16A lower air inlet 16B Air inlet upper part 18 Main port 19 Air element 20 Blow-by room 20A Blow-by chamber bottom 20B Upper part of blow-by chamber 28 Connection part 31 Throttle box 40 division walls 36, 37 Side part 43 Throttle 49 Air flow meter mounting member 51,52 intake pipe 51a, 52a Downstream end 51b, 52b upstream end 53 Downstream mounting flange 54 Upstream mounting flange 56,57 intake pipe 56a, 57a Downstream end 58 Downstream mounting flange 56b, 57b upstream end 59 Upstream mounting flange 70 engine 71 crankcase 75 Intercooler S throttle central axis

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) F02M 35/024 F02M 35/04 A 35/04 35/10 102A (72) Inventor Yuji Chiba Shinjuku-ku, Tokyo 1-7-2 Nishi Shinjuku Fuji Heavy Industries Ltd. F term (reference) 3G015 AA08 AA09 BD12 BD24 BE05 BE15 BF05 CA06 DA02 EA05 3G065 AA04 CA23 HA06 HA21

Claims (7)

[Claims] 1. An intake system for an engine, wherein air passing through a cleaner case containing an air element is introduced into a throttle box through a throttle and is distributed from the throttle box to each cylinder of an engine by an intake manifold. Mounted on and supported by the upper surface of the engine through the intake manifolds that are respectively joined to opposite side surfaces of the throttle box, the cleaner case is joined to the throttle box, and the intake manifold is opposed to the throttle box. The throttle has a plurality of intake pipes which are vertically arranged side by side and open at the upstream end, and whose lower end is joined to each intake port of the engine. Is approximately horizontal above the intake pipes arranged above and below The intake air of the engine is arranged in the throttle box so as to extend in the vertical center between the side end portions and to extend toward the center between the opposed upstream end portions which are disposed on the both side surface portions. apparatus. 2. The cleaner case has an air cleaner case accommodating the air element and a main port for guiding air from the air cleaner case to the throttle, and the main port is provided on an extension of a central axis of the throttle. The intake system for an engine according to claim 1, wherein an intake system passage from the throttle to the air element is arranged in a substantially straight line. 3. The cleaner case includes a cleaner case main body, which is integrally formed of resin, in which a lower part of the air cleaner case which accommodates the air element is opened, and a lower part of the blow-by chamber whose upper part is opened is partitioned by a partition wall. An air cleaner case upper part and a blow-by chamber upper part that respectively close the upper part of the air cleaner case lower part and the blow-by chamber lower part are provided with a case cover integrally molded with resin, and by joining the cleaner case body and the case cover,
A hollow cleaner case for housing an air element is formed by the lower part of the air cleaner case and an upper part of the air cleaner case, and a blow-by chamber of a blow-by gas recirculation system is formed by the lower part of the blow-by chamber and the upper part of the blow-by chamber. The intake system for the engine according to 1 or 2. 4. The main body of the cleaner case is further integrally formed with a main port that penetrates from a lower portion of the air cleaner case to a lower portion of the blow-by chamber to introduce air from the air cleaner case to the throttle. The intake device for the engine according to item 3. 5. The engine air intake device according to claim 3, wherein an air flow meter mounting member for supporting the air flow meter is provided on either one of the cleaner case body and the case cover. 6. The intake manifold according to claim 1, wherein the intake manifold is divided into a pair of intake manifolds that are individually joined to respective side surface portions of the throttle box. Engine intake system. 7. An intercooler instead of the cleaner case is joined to the throttle box at substantially the same height as the throttle box.
The intake device for the engine according to.