WO2016103402A1 - V-type engine intake structure - Google Patents

Abstract

This V-type engine intake structure is equipped with: a supercharger that is provided at a position between V-banks of a V-type engine above cylinder heads of the banks and has a discharge port at an upper portion thereof; an outlet passage for distributing toward the left and right banks the intake air discharged upwardly from the supercharger, said outlet passage being mounted to an upper portion of the supercharger and formed so as to extend toward the left and right banks; intake air introducing portions that are curved below the left and right ends of the outlet passage toward the inside of the banks along the outer shapes of rocker covers provided to the cylinder heads, said intake air introducing portions being connected to intake ports of the cylinders of the banks; intercoolers for cooling the intake air discharged from the supercharger, said intercoolers being provided between the left and right ends of the outlet passage and the intake air introducing portions; and a plurality of pillar members for fixing the intercoolers between the outlet passage and the intake air introducing portions, said pillar members being inserted between the outlet passage and the intake air introducing portions around the intercoolers and coupled to the outlet passage and the intake air introducing portions.

Description

V-type engine intake structure

This disclosure relates to an intake structure for a V-type engine having a supercharger above the left and right banks.

Some engines mounted on vehicles are provided with a supercharger for the purpose of improving engine output, and some are provided with a supercharger (mechanical supercharger) driven by the engine. . The supercharger rotates with the driving force transmitted from the crankshaft.
In particular, in a V-type engine, a supercharger is disposed above the V bank, and intake air discharged from the supercharger is supplied to each cylinder in both banks via a distribution intake passage disposed between the V banks. A structure is known that supplies a port.

V-type engines equipped with such a supercharger are disclosed in, for example, Patent Documents 1 and 2.
Since the V-type engine in which the supercharger is arranged above the V bank has a large size in the height direction, when the V-type engine having the above configuration is arranged in the engine room of the vehicle body, it is necessary to keep the total height low.
Patent Documents 1 and 2 disclose an intake structure in which a discharge port is formed in an upper portion of a supercharger, and an intake passage is led downward from the discharge port so as to surround the casing of the supercharger. With this configuration, the layout of the intake passage is easier than disposing the discharge port below the supercharger, so the height of the V-type engine can be reduced by lowering the height of the supercharger.

An engine equipped with a supercharger needs an intercooler in the intake passage to cool the intake air heated by the supercharger. Since the intake structure including the supercharger and the intercooler is considerably heavy, it is necessary to increase the rigidity of the support portion of the intake structure, to make the support portion compact, and to suppress an increase in the overall height of the V-type engine.

Japanese Patent No. 3362162 Japanese Patent No. 3870451

When an intercooler is provided in an intake structure in which a supercharger is disposed between V banks, it is necessary to suppress an increase in the weight of the intake structure and an increase in the overall height of the V-type engine while ensuring the mounting strength of the intercooler.

In view of such a technical problem, at least one embodiment of the present invention has an intercooler mounting strength in an intake structure of a V-type engine in which a supercharger is disposed between V banks and an intercooler is provided in an intake passage. The purpose is to suppress an increase in the weight of the intake structure and an increase in the overall height of the V-type engine.

An intake structure for a V-type engine according to at least one embodiment of the present invention includes: (1) a supercharger provided between a V-bank of a V-type engine and above a cylinder head of each bank, and having a discharge port at an upper portion thereof; And an outlet passage portion that is attached to an upper portion of the supercharger and extends in the left and right bank directions, and distributes the intake air discharged upward from the supercharger in the left and right bank directions, and the outlet passage portion. An intake inlet portion that is curved inward of the bank along the outer shape of the rocker cover provided on the cylinder head below the left and right end portions of the cylinder, and is connected to the intake port of the cylinder of each bank, and the left and right ends of the outlet passage portion And an intercooler for cooling the intake air discharged from the supercharger. The intercooler is inserted between the outlet passage portion and the intake air inlet portion around the intercooler, and is connected to the outlet casing and the intake air inlet portion to connect the intercooler to the outlet passage portion and the intake air inlet portion. And a plurality of pillar members for fixing between them.

According to the configuration (1), since the outlet passage portion and the intake air introduction portion are arranged so as to surround the periphery of the supercharger from the upper part to the lower part of the supercharger, the layout of the intake passage becomes easy. The supercharger mounting position can be lowered. Therefore, the overall height of the V-type engine can be reduced. In addition, since the intercoolers are distributed on the left and right of the supercharger, the volume of each intercooler can be reduced, and the overall height of the V-type engine can be further reduced.
In addition, since the intercooler is fixed between the outlet passage portion and the intake air introduction portion by the plurality of column members, sufficient attachment strength can be obtained while suppressing an increase in the weight of the intake structure.
With the intake structure, the overall height of the V-type engine can be suppressed even if the V-type engine is a narrow engine having a V narrow angle of 60 ° or less.

In some embodiments, in the configuration (1), (2) the column member has a hollow portion penetrating in the axial direction, and is inserted into the hollow portion, and the outlet passage portion and the end portion at both ends. A fastening bolt coupled to the intake air introduction portion is further provided.
According to said structure (2), the attachment intensity | strength of the said column member with respect to the said exit channel | path part and the said air intake introduction part can be raised by using the said fastening bolt.

In some embodiments, in the configuration (2), (3) the outlet passage portion, the intercooler, and the intake air introduction portion each have a flange portion on an outer periphery, and the column member is a flange portion of the intercooler. The both end surfaces of the column member are in contact with the mutually facing surfaces of the outlet passage portion and the flange portion of the intake air introduction portion, and the fastening bolt is at both ends. The outlet passage portion and the flange portion of the intake air introduction portion are respectively coupled.

According to the configuration (3), since both end surfaces of the column member are brought into contact with the mutually facing surfaces of the outlet passage portion and the flange portion of the intake air introduction portion, durability against a compressive load acting on the intercooler is achieved. Can be improved.

In some embodiments, in the configuration (3), (4) the flange portion of the intercooler is in contact with the flange portion of the outlet passage portion via an elastic member.
According to the configuration (4), a gap is formed between the outlet passage portion and the intercooler by the elastic member. This clearance can reduce the weight of the intake structure added to the intercooler and improve the durability of the intercooler. Moreover, the intercooler can be stably supported by mounting the elastic member.
Further, the clearance can prevent the vibration of the supercharger from being transmitted to the intercooler, and thereby suppress the metal fatigue of the intercooler. Therefore, even when the casing of the intercooler is made of resin or light metal, the durability of the intercooler can be improved.

In some embodiments, in any one of the configurations (1) to (4), (5) the column member is configured separately from the intercooler.
According to the configuration (5), the column member can be easily manufactured and handled.

In some embodiments, in any one of the configurations (1) to (5), (6) the plurality of column members are arranged at least at four corners of the intercooler.
According to the configuration (6), since the load applied to the intercooler can be received by the column members arranged at the four corners of the intercooler, uniform durability can be obtained throughout the intercooler.

In some embodiments, in any one of the configurations (1) to (6), (7) the outlet passage portion, the intercooler, and the intake air introduction portion are disposed in an inner region of the rocker cover in a plan view. ing.
According to the configuration (7), the intake structure including the supercharger and the intercooler can be made compact in the lateral direction, and the degree of freedom in arranging the V-type engine in the engine room can be increased.

In some embodiments, in any of the configurations (1) to (7), (8) the casing of the intercooler is made of resin.
According to the configuration (8), since the intercooler can be reduced in weight, the mounting strength of the intercooler can be reduced, and the mounting structure of the intercooler can be simplified.

According to at least one embodiment of the present invention, when an intercooler is provided in an intake structure in which a supercharger is disposed between V banks, an increase in the weight of the intake structure and a V The increase in the overall height of the type engine can be suppressed.

1 is a partially cut front view of a front portion of a vehicle including a V-type engine according to an embodiment of the present invention. It is a perspective view of the V-type engine. It is a top view of the V-type engine. It is sectional drawing which follows the AA line in FIG. It is a partially cutaway side view of the vehicle front part. It is a perspective view of the support structure of the intercooler concerning one embodiment. It is sectional drawing of the support structure of the intercooler which concerns on one Embodiment. It is sectional drawing of the support structure of the intercooler which concerns on one Embodiment.

Several embodiments of the present invention will be described below with reference to the accompanying drawings. However, the dimensions, materials, shapes, and relative arrangements of the components described in these embodiments or shown in the drawings are not intended to limit the scope of the present invention, but are merely illustrative examples. Only.
For example, expressions expressing relative or absolute arrangements such as “in a certain direction”, “along a certain direction”, “parallel”, “orthogonal”, “center”, “concentric” or “coaxial” are strictly In addition to such an arrangement, it is also possible to represent a state of relative displacement with an angle or a distance such that tolerance or the same function can be obtained.
For example, an expression indicating that things such as “identical”, “equal”, and “homogeneous” are in an equal state not only represents an exactly equal state, but also has a tolerance or a difference that can provide the same function. It also represents the existing state.
For example, expressions representing shapes such as quadrangular shapes and cylindrical shapes represent not only geometrically strict shapes such as quadrangular shapes and cylindrical shapes, but also irregularities and chamfers as long as the same effects can be obtained. A shape including a part or the like is also expressed.
On the other hand, the expressions “comprising”, “comprising”, “comprising”, “including”, or “having” one constituent element are not exclusive expressions for excluding the existence of other constituent elements.

1 to 6 show a configuration of a V-type engine 10 according to an embodiment of the present invention. In the figure, the front / rear, left / right, and up / down directions of the vehicle body are defined in FIGS. 1 to 3 on the basis of the viewpoint of the driver sitting in the driver's seat.
Hereinafter, the overall configuration of the engine will be described with reference to FIGS.

(Entire engine configuration)
1 and 2, a V-type engine 10 is a four-cycle V-type six-cylinder gasoline engine, and is provided in an engine room er inside the front hood 1 at the front of the vehicle body. The bank angle (bank sandwich angle) of the V bank is, for example, 60 °. Three cylinders are juxtaposed in each of the left and right banks 12a and 12b forming a V shape.
In each cylinder, pistons 16a and 16b are slidably fitted inside the cylinders 14a and 14b. Each piston 16a and 16b is connected to the crankshaft 20 rotatably accommodated in the crankcase 18 via connecting rods 22a and 22b.

Each of the left and right banks 12a and 12b has cylinder blocks 24a and 24b. Cylinder heads 26a and 26b are coupled to the upper portions of the cylinder blocks. Further, valve valves such as camshafts are disposed on the upper portions of the cylinder heads. Rocker covers 28a and 28b are attached so as to cover the mechanism. An opening for supplying lubricating oil is formed on the upper surface of the rocker cover 28a, and a lid 29 for shielding the opening is provided.
The V-type engine 10 according to the present embodiment is a so-called offset engine in which the cylinder axis of each cylinder is offset to the thrust side of the piston (crankshaft rotation direction) with respect to the center of the crankshaft. According to this offset engine, the side pressure of the piston in the combustion stroke can be reduced, and as a result, it is possible to achieve low fuel consumption and low vibration noise of the engine (details of the offset engine are disclosed in, for example, Japanese Patent Application Laid-Open No. 3-281901 and Japanese Patent Application Laid-Open No. 3-281901). (See 2007-332792).

A supercharger 30 is provided between the left and right banks 12a and 12b and above the cylinder heads 26a and 26b of each bank. The supercharger 30 is driven by the crankshaft 20 and sends out intake air to the cylinder heads 26a and 26b.

In the exemplary configuration shown in FIG. 1, the supercharger 30 is located above the shaft center P of the crankshaft 20, and the lower surface of the supercharger 30 is disposed above the upper surface position H of the rocker covers 28a and 26b. The
An exit passage portion 32 is provided in the upper portion of the supercharger 30. The outlet passage portion 32 is formed to extend in the direction of the left and right banks. The supercharger 30 is supported by being suspended at a substantially central portion of the outlet casing 34 constituting the outlet passage portion 32. The outlet passage portion 32 forms a flow path of the intake air discharged from the supercharger 30 and distributes the intake air in the left and right bank directions.
In the exemplary configuration shown in FIGS. 1 to 5, the outlet casing 34 has a flat three-dimensional structure with a low height.

Each cylinder head 26a and 26b is provided with intake ports 38a and 38b and exhaust ports (not shown) that are controlled to open and close by an intake valve and an exhaust valve (not shown). The intake port and the exhaust port open to a combustion chamber cr formed in the cylinders 14a and 14b. The intake valve and the exhaust valve are each driven at a predetermined timing via a cam shaft (not shown).

On the other hand, the fuel injector includes port injectors 42a and 42b for injecting fuel into the intake ports 38a and 38b, and direct injectors 44a and 44b for injecting fuel directly into the combustion chamber cr of each cylinder.
Note that the left and right banks are shifted in the longitudinal direction of the vehicle body in order to secure an arrangement space for the port injectors 42a and 42b and the direct injectors 44a and 44b.
As shown in FIG. 3, each cylinder head 26a and 26b has spark plugs 46a and 46b for igniting and burning the air-fuel mixture supplied to the combustion chamber cr of the cylinders 14a and 14b and the air-fuel mixture mixed in the combustion chamber cr. It is installed.
Hereinafter, the intake structure will be described with reference to FIGS.

(Intake structure)
As a driving force for driving the supercharger 30, the rotation of the crankshaft 20 is transmitted to the supercharger 30 by power transmission means 48 such as a belt or a chain. The power transmission means 48 is wound around a pulley 50 connected to one of rotors 54, 54 described later of the supercharger 30.
As shown in FIG. 4, the supercharger 30 includes a pair of, for example, four-leaf root- type rotors 54, 54 inside a cylindrical casing 52. The pair of rotors 54 and 54 mesh with each other and rotate reversely to discharge the intake air downstream. The rotating shaft of one rotor 54 protrudes from the cylindrical casing 52, and a pulley 50 is connected to the front end. The rotation of the one rotor 54 is transmitted to the other rotor 54 through transmission means such as a gear. Both ends of the cylindrical casing 52 are shielded by end plates 51 and 53, and a conical bearing body 51 a that rotatably supports the rotation shafts of the pulley 50 and the rotor 54 is bolted to the end plate 51.

As shown in FIG. 5, the suction port 56 through which intake air flows into the cylindrical casing 52 is formed at the rear end portion of the cylindrical casing 52, and the discharge port 58 is provided at the upper front of the cylindrical casing 52. Yes. As the rotors 54 and 54 rotate, intake air is sucked from the suction port 56 and discharged upward from the discharge port 58, that is, to the outlet passage o formed inside the outlet casing 34.
A rear casing 60 that forms a bypass passage b is connected to the rear side of the cylindrical casing 52 and the outlet casing 34 in the vehicle body. The bypass passage b communicates with the outlet passage o and is disposed in the vertical direction, and a bypass valve 62 is provided. The bypass passage b is provided with an inlet duct 40 for sucking outside air downstream of the bypass valve 62 and communicates with the suction port 56.

The outside air a is sucked from the inlet duct 40 by the rotation of the rotors 54, 54, and is sucked into the cylindrical casing 52 through the suction port 56. A part of the intake air discharged from the supercharger 30 to the outlet passage o is returned to the bypass passage b, whereby the discharge intake pressure of the outlet passage o can be adjusted, and the return intake amount is adjusted by the bypass valve 62. The inlet duct 40 is provided with a throttle valve (not shown) for adjusting the intake air amount.

As shown in FIGS. 1 and 4, the intake passage for guiding the intake air discharged from the discharge port 58 to the intake ports 38a and 38b of the V-type engine 10 is roughly divided into an outlet passage portion 32 and an intake introduction portion 64a. And 64b.
The outlet passage portion 32 distributes the intake air discharged upward from the discharge ports 58 in the left and right bank directions.
The intake intake portions 64a and 64b are portions that extend downward from the left and right ends of the outlet passage portion 32, pass through the left and right sides of the cylindrical casing 52, and lead to the intake ports 38a and 38b of the cylinders 14a and 14b of each bank. is there.
A cylindrical casing 52 of the supercharger 30 is suspended and supported at a substantially central portion of the outlet passage portion 32 by the outlet passage portion 32 and the intake introduction portions 64a and 64b. In the exemplary configuration of the present embodiment, the cylindrical casing 52 is coupled to the outlet casing 34 by a bolt 80.

The intake air introduction portions 64a and 64b are configured by upper intake air introduction portions 66a and 66b to which the intercoolers 70a and 70b are mounted, and lower intake air introduction portions 68a and 68b provided below the upper intake air introduction portions 66a and 66b. ing.
The lower intake introduction portions 68a and 68b are constituted by branch passages branched toward the respective cylinders, curved inward along the outer shape of the rocker covers 28a and 28b, and the intake ports 38a and 14b of the cylinders 14a and 14b of the respective banks. 38b.

As shown in FIG. 2, the outlet casing 34 has a flat, substantially rectangular parallelepiped shape in which the left and right bank directions are long, and the right and left bank directions (axial direction of the crankshaft 20) are short.
By making the outlet casing 34 into a flat shape extending in the left and right bank directions, the height of the outlet passage portion 32 can be suppressed and the overall height of the V-type engine 10 can be suppressed. Further, by making the outlet casing 34 into a three-dimensional shape, it is easy to ensure the necessary intake air amount by securing the length in the short direction even if it is flat.

The outer surface of the outlet casing 34 is disposed so as to face the inner surface of the front hood 1, and is disposed along the inclination direction of the front hood 1 with a gap c between the front hood 1.
A central opening is formed at the central portion of the bottom wall of the outlet casing 34 in the left-right direction so as to overlap the discharge port 58, and a flange portion 52 a formed around the discharge port 58 is joined around the central opening. A flange portion 34a is formed.
Openings are formed in the left and right end portions of the bottom wall of the outlet casing 34, and the left and right end portions are connected to the upper end portions of the upper intake introduction portions 66a and 66b, respectively.

Furthermore, slit-like distribution ribs 36 are formed on the inner wall surface of the outlet casing 34 facing the discharge port 58 so as to protrude inward over the entire region in the lateral direction in the longitudinal direction of the vehicle body. The distribution ribs 36 can evenly distribute the intake air discharged from the discharge ports 58 in the left and right bank directions, and improve the distribution of the intake air discharged from the supercharger 30 to the left and right banks.
In the exemplary configuration of the present embodiment, the upper wall portion of the outlet casing 34 is coupled to the recess 34 b for housing the bolt 80 that supports the supercharger 30 in a suspended manner, and the intercoolers 70 a and 70 b to the outlet casing 34. A recess 34c for accommodating the bolts 86a and 86b is formed.

As shown in FIG. 5, the front hood 1 is gently inclined upward toward the rear of the vehicle body. The outer surface of the outlet casing 34 is arranged in a direction along the inner surface of the front hood 1 in substantially the entire region except for the region of the distribution rib 36, and has a gap c of the same interval with respect to the inner surface of the front hood 1. It is formed as follows.
Therefore, since a sufficient gap c can be secured between the outlet casing 34 and the front hood 1, even if it collides with a pedestrian, the amount of deformation of the front hood 1 can be increased, and damage to the pedestrian can be reduced. Moreover, since the exit casing 34 does not form a partial protrusion toward the front hood 1, it is possible to suppress harm to pedestrians.

Further, since the outlet casing 34 is formed such that the height of the inner wall surface facing the discharge port 58 increases from the front to the rear in the short direction, the inner wall surface of the outlet casing 34 is the rotor 54 of the supercharger 30. , 54 with respect to the direction of the rotation axis.
For this reason, since the intake air discharged from the discharge port 58 collides with the inner wall surface of the outlet casing 34 in an inclined state rather than at a right angle, an effect of reducing a collision sound generated at the time of the collision can be obtained.

The supercharger 30 is inserted into a hole formed in the flange portion 34a from a hole formed in the concave portion 34b of the upper wall portion of the outlet casing 34, and fixed to the outlet casing 34 by a plurality of bolts 80 screwed into the flange portion 52a. Is done. Thereby, the supercharger 30 can be easily fixed in a suspended state.
The outlet casing 34 is made of a light metal such as resin or aluminum. As a result, the outlet casing 34 can be reduced in weight, and further, the outlet casing 34 is integrally formed by casting or the like with resin or light metal, thereby facilitating manufacture.

Next, the configuration of the upper intake air inlets 66a and 66b to which the intercoolers 70a and 70b are mounted will be described.
As shown in FIG. 4, the intercoolers 70a and 70b are provided on the left and right sides of the supercharger 30 and above the rocker covers 28a and 28b for the left and right banks 12a and 12b, respectively. The intercoolers 70a and 70b have the same structure on the left and right, and water-cooled intercooler cores 74a and 74b are housed inside rectangular parallelepiped casings 72a and 72b.
As shown in FIGS. 1 and 2, the cooling water w is supplied to the intercooler cores 74a and 74b from the supply ports 76a and 76b, and is discharged from the discharge ports 78a and 78b. The cooling water supply ports 76a and 76b are disposed on the lower side and the discharge ports 78a and 78b are disposed on the upper side so that the bubbles in the cooling water can be easily discharged.

For example, as shown in FIG. 6, a plurality of column members 84a and 84b are inserted between the outlet casing 34 constituting the outlet passage 32 and the intake air inlets 64a and 64b around the intercoolers 70a and 70b. The column members 84a and 84b are connected to the outlet casing 34 and the intake air inlets 64a and 64b to fix the intercoolers 70a and 70b between the outlet casing 34 and the intake air inlets 64a and 64b.
In the exemplary configuration, the casings 72a and 72b are made of resin, and the column members 84a and 84b are made of metal.
In the exemplary configuration shown in FIG. 6, the column members 84a and 84b have hollow portions 100a and 100b that pass through the fastening bolts 86a and 86b in the axial direction, and the column members 84a and 84b have the hollow portion 100a. And the fastening passages 86a and 86b inserted into the 100b are connected to the outlet passage portion 32 and the upper intake introduction portions 66a and 66b.

Flange portions 88 a and 88 b are formed on the outer periphery of the lower end of the outlet casing 34, and flange portions 90 a and 90 b are formed on the outer periphery of the upper end of the upper intake introduction portions 66 a and 66 b. Through holes are formed in the flange portions 88a and 88b, and screw holes are formed in the flange portions 90a and 90b.
In addition, disc-shaped flanges 102a, 102b and 104a, 104b having a diameter larger than that of the column member main body are formed in the upper portions of the upper and lower end coupling portions of the column members 84a and 84b.

As shown in FIG. 7, the flange portions 102a and 102b are in contact with the lower surfaces of the flange portions 88a and 88b, and the lower end coupling portions of the column members 84a and 84b are inserted into through holes 106a and 106 formed in the flange portions 82a and 82b. Press fit.
In this state, the flange portions 104a and 104b abut on the upper surfaces of the flange portions 82a and 82b, and the lower end surfaces of the column members 84a and 84b abut on the upper surfaces of the flange portions 90a and 90b. Between the lower surfaces of the flange portions 104a and 104b and the upper surfaces of the flange portions 82a and 82b, annular elastic packings 108a and 108b made of rubber, for example, are interposed, and the lower surfaces of the flange portions 82a and 82b and the flange portions 90a and 90b Between the upper surface, annular elastic packings 110 and 110 are interposed.

FIG. 8 shows another structure for attaching the column members 84a and 84b to the flange portions 82a and 82b. In this mounting structure, female screws are formed on the inner surfaces of the through holes 106a and 106, and male screws 114a and 114b are formed on the outer peripheral surfaces of the lower end coupling portions of the column members 84a and 84b. 114a and 114b are screwed into the female screw. Other configurations are the same as those of the embodiment shown in FIG.
In each embodiment shown in FIGS. 7 and 8, fastening bolts 86a and 86b are inserted from above into the hollow portions 100a and 100b of the flange portions 88a and 88b and the column members 84a and 84b. Female screws are formed in the through holes of the flange portions 90a and 90b, and the lower ends of the fastening bolts 86a and 86b are screwed into the female screws. In this way, the intercoolers 70a and 70b are fixed between the outlet casing 34 and the upper intake introduction portions 66a and 66b.

In the exemplary configuration, the column members 84a and 84b are separate from the flange portions 82a and 82b, and are fixed to the flange portions 82a and 82b by the mounting structure of each of the embodiments.
In the exemplary configuration, the column members 84a and 84b are disposed around the intercoolers 70a and 70b, and are disposed at least at the four corners of the intercoolers 70a and 70b. In this embodiment, as shown in FIG. 6, six column members 84a and 84b are arranged around the casings 72a and 72b.
Further, in the exemplary configuration, the outlet passage portion 32 is configured to be disposed in the inner region of the rocker covers 28a and 28b in plan view.
Further, in the exemplary configuration, the casings 72a and 72b are made of resin and may be integrally formed with the intercooler cores 74a and 74b. As a result, the weight of the intercoolers 70a and 70b can be reduced, and manufacturing is facilitated.

As shown in FIG. 7, the axial lengths of the column members 84a and 84b are formed larger than the heights of the casings 72a and 72b. Therefore, a gap h is formed between the flange portions 88a and 88b of the outlet casing 34 and the upper surfaces of the flange portions 73a and 73b formed at the upper ends of the casings 72a and 72b. The gap h is filled with elastic packing, for example, rubber elastic packing 112a and 112b.
In the exemplary configuration, the lower end surfaces of the column members 84a and 84b and the lower surfaces of the flange portions 82a and 82b have the same height and form a flat continuous surface without a step. The continuous surface comes into contact with the flat upper surfaces of the flange portions 90a and 90b.

Next, the configuration of the lower intake inlets 68a and 68b will be described.
For example, as shown in FIGS. 1 and 4, the lower intake introduction portions 68a and 68b are provided below the upper intake introduction portions 66a and 66b, and have branch passages branched toward the respective cylinders. That is, the lower intake introduction portions 68a and 68b are portions corresponding to intake manifolds, and the lower intake introduction portions 68a and 68b having branch passages are integrally formed by a method such as casting using metal or resin, for example.
As described above, the upper end flange portions 90a and 90b of the lower intake introduction portions 68a and 68b are fastened to the lower end flange portions 82a and 82b of the upper intake introduction portions 66a and 66b by the fastening bolts 86a and 86b. Lower end flange portions 92a and 92b of the lower intake introduction portions 68a and 68b are bolted to openings of the intake ports 38a and 38b of the cylinder heads 26a and 26b.

The upper part of the lower intake introduction parts 68a and 68b is provided with a collecting part that collects the intake air after passing through the intercoolers 70a and 70b and directs the flow direction to the inside of the bank. Each branch passage is formed by branching from the gathering portion.
The branch passage is curved inward of the bank along the outer shape of the rocker covers 28a and 28b, passes between the upper surface of the rocker cover and the lower surface of the supercharger 30, and the intake ports 38a and 38b of the cylinders 14a and 14b. Connected to.

Further, a front-rear connecting portion 94 for connecting a plurality of branch passages in the front-rear direction of the vehicle body is provided from the lower end flange portions 92a and 92b of the lower intake introducing portions 68a and 68b to the collective portion. The formed wall surface is formed. Further, reinforcing ribs 96 are formed on the integrated wall surface and the wall surface of the collective portion.
As a result, the insides of the left and right lower intake air introduction portions 68a and 68b are protected by the integrated wall surfaces on both sides, so that the safety of the piping and components of the fuel injection device disposed on the inside is ensured. Further, the integrated wall surfaces on both sides have a function of guiding the flow of air into the inner space, and thereby, a cooling effect of devices provided in the inner space can be expected.

Hereinafter, the operation of the intake structure of the V-type engine 10 will be described.
When the V-type engine 10 is started and the crankshaft 20 rotates, the rotation of the crankshaft 20 is transmitted to the pulley 50 by the power transmission hand 48, and the rotors 54 and 54 rotate reversely to each other. By the rotation of the rotors 54, the intake air is sucked into the cylindrical casing 52 through the suction port 56, discharged upward in the discharge port 58 column member, and discharged into the outlet passage o formed in the outlet casing 34. Is done.
In the outlet passage o, the intake air is evenly distributed to the left and right banks by the distribution ribs 36. Thereafter, the intake air directed toward each bank changes its direction downward at both end portions of the outlet casing 34 and is introduced into the left and right intercoolers 70a and 70b to be cooled.

The cooled intake air changes the direction of the flow inward between the banks at the gathering portion of the upper intake introduction portions 66a and 66b, and the lower intake introduction portions 68a and 68b are curved along the outer shape of the rocker covers 28a and 28b. It flows into the passage. The intake air is supplied to the combustion chambers of the cylinders 14a and 14b from the openings of the intake ports 38a and 38b formed on the upper surfaces of the cylinder heads 26a and 26b.
On the other hand, the atomized fuel injected from the port injectors 42a and 42b and the direct injectors 44a and 44b and the intake air are mixed in the intake ports 38a and 38b and the combustion chamber cr to form a desired air-fuel ratio.

According to at least one embodiment of the present invention, the outlet passage portion 32 and the intake air introduction portions 64a and 64b are arranged so as to surround the periphery of the supercharger 30 from the top to the bottom. Layout becomes easy. Therefore, the mounting position of the supercharger 30 can be lowered, so that the overall height of the V-type engine 10 can be reduced.
Further, since the intercoolers 70a and 70b are distributed on the left and right of the supercharger 30, the overall height of the V-type engine 10 can be reduced.

Further, since the intercoolers 70a and 70b are fixed between the outlet passage portion 32 and the intake air introduction portions 64a and 64b by the plurality of column members 84a and 84b, the intercooler 70a has a compact configuration without causing an increase in the weight of the intake structure. And the strength and mounting strength of 70b can be increased.
Furthermore, since the space occupied by the intake structure can be reduced, the overall height of the V-type engine can be suppressed as much as possible even if the V-type engine 10 is a narrow engine having a V narrow angle of 60 ° or less.
Further, since the supercharger 30 is supported by being suspended from the outlet passage portion 32, it is not necessary to provide a support portion below the supercharger 30, and therefore the overall height of the V-type engine 10 can be further reduced.

Further, since the column members 84a and 84b are coupled to the outlet passage portion 32 and the upper intake air introduction portions 66a and 66b by fastening bolts 86a and 86b inserted into the hollow portions 100a and 100b, the mounting strength of the intercoolers 70a and 70b. Can be increased.
Also, since the flange portions 102a and 102b of the column members 84a and 84b are in contact with the lower surfaces of the flange portions 88a and 88b, and the lower end surfaces of the column members 84a and 84b are in contact with the upper surfaces of the flange portions 90a and 90b, the intercooler 70a and Durability can be improved with respect to compressive strength acting on 70b.
Moreover, since the column members 84a and 84b are formed separately from the flange portions 82a and 82b, the manufacture and handling are facilitated.

Further, since the plurality of column members 84a and 84b are provided at least at the four corners of the casings 72a and 72b, the column members 84a and 84b can obtain equal durability over the entire intercooler.
Further, since the outlet casing 34, the intercoolers 70a and 70b, and the intake air introduction portions 64a and 64b are disposed inside the rocker covers 28a and 28b in a plan view, an intake structure including the supercharger 30 and the intercoolers 70a and 70b is provided. Compactness can be achieved in the lateral direction, and the degree of freedom in arrangement of the V-type engine 10 can be expanded.
Moreover, since the casings 72a and 72b of the intercoolers 70a and 70b are made of resin, the intake structure can be reduced in weight, and the column members 84a and 84b are made of metal, so that the rigidity of the column members 84a and 84b is increased. And the mounting strength of the intercoolers 70a and 70b can be increased.

Further, since the column members 84a and 84b have an axial length larger than the height of the casings 72a and 72b of the intercoolers 70a and 70b, the upper surfaces of the casings 72a and 72b and the flange portions 88a and 88b of the outlet casing 34, A gap h is formed between them. By this gap h, the weight of the intake structure added to the intercoolers 70a and 70b can be reduced, and the durability of the intercoolers 70a and 70b can be improved. Moreover, the intercoolers 70a and 70b can be stably supported by mounting the elastic packings 112a and 112b in the gap h.
Further, the vibration h of the supercharger 30 can be suppressed from being transmitted to the intercoolers 70a and 70b by the gap h, and thereby metal fatigue of the intercoolers 70a and 70b can be suppressed. Therefore, even when the casings 72a and 72b are made of resin or light metal, the durability of the intercoolers 70a and 70b can be improved.

In addition, the lower surfaces of the column members 84a and 84b and the lower surfaces of the flange portions 82a and 82b form a continuous flat surface without any step, and the continuous flat surfaces contact the flat upper surfaces of the flange portions 90a and 90b. The gap h can be formed reliably. Further, by forming the continuous surface, the connection with the upper surfaces of the flange portions 90a and 90b is facilitated.
Further, since the column members 84a and 84b are press-fitted or screwed into the through holes 106a and 106 of the flange portions 82a and 82b, the column members 84a and 84b can be connected to the flange portions 88a and 88b by simple and low-cost means. Easy to install.

Furthermore, since the lower surface of the supercharger 30 is disposed above the upper surfaces of the rocker covers 28a and 28b, the supercharger 30 can be disposed without increasing the overall width of the V-type engine 10. Further, since the ventilation space can be formed below the lower surface of the supercharger 30, the supercharger 30 can be cooled by the ventilation flowing through the ventilation space.

As shown in FIGS. 1 and 4, when viewed in the crankshaft direction, the supercharger 30 includes an outlet casing 34 that constitutes the outlet passage portion 32, and upper intake introduction portions 66a and 66b including intercoolers 70a and 70b. Since it is disposed inside the closed cross-sectional structure surrounded by the lower intake introduction portions 68a and 68b, the rigidity of the suspension support structure of the supercharger 30 is further improved by the closed cross-sectional structure. Therefore, stable support of the supercharger 30 becomes possible.
Further, the outlet casing 34 constituting the outlet passage portion 32, the intercoolers 70a and 70b, the upper intake air introduction portions 66a and 66b, and the lower intake air introduction portions 68a and 68b are separated from each other, and are fastened with fastening bolts. Therefore, even if the structure is such that the piping and parts of the fuel injection device are housed inside the left and right banks, the assembly becomes easy.

Further, the lower end flange portions 92a and 92b of the lower intake introduction portions 68a and 68b in the left and right banks are connected by a left and right connecting portion 98.
The left and right connecting portions 98 may be provided at both ends of the vehicle body in the front-rear direction, or at a plurality of locations at intervals in the front-rear direction, and may be provided entirely as a bottom wall. As a result, the rigidity of the lower intake inlets 68a and 68b can be further improved.
In the above-described embodiment, the supercharger 30 is suspended and supported by the outlet casing 34. Alternatively, the supercharger 30 may be fixed to the intake air inlets 64a and 64b. Thus, by adding the weight of the supercharger 30 only to the intake air introduction portions 64a and 64b, it is possible to improve the positional accuracy with respect to the suspension support means of the above embodiment and to improve the durability reliability. In this case, the outlet casing 34 is coupled to the supercharger 30 and the intake air introduction portions 64a and 64b only for the purpose of forming the intake passage.

According to one embodiment of the present invention, in an intake structure of a V-type engine in which a supercharger is disposed between V banks and an intercooler is provided in an intake passage, the intake structure is secured while ensuring the mounting strength of the intercooler. The increase in the weight and the increase in the overall height of the V-type engine can be suppressed.

10 V- type engine 12a, 12b Bank 14a, 14b Cylinder 16a, 16b Piston 18 Crankcase 20 Crankshaft 22a, 22b Connecting rod 24a, 24b Cylinder block 26a, 26b Cylinder head 28a, 28b Rocker cover 30 Supercharger 32 Exit passage 34 Exit Casing 36 Distribution rib 38a, 38b Intake port 40 Inlet duct 42a, 42b Port injector 44a, 44b Direct injector 46a, 46b Spark plug 48 Power transmission means 50 Pulley 52 Cylindrical casing 54 Rotor 56 Suction port 58 Outlet port 60 Rear casing 62 Bypass Valve 64a, 64b Intake air inlet 6 a, 66b Upper intake introduction part 68a, 68b Lower intake introduction part 70a, 70b Intercooler 72a, 72b Casing 73a, 73b, 82a, 82b, 88a, 88b, 90a, 90b, 92a, 92b Flange part 74a, 74b Intercooler core 76a, 76b Supply port 78a, 78b Discharge port 80, 86a, 86b Fastening bolt 84a, 84b Column member 94 Front / rear connecting part 96 Reinforcing rib 98 Left / right connecting part 100a, 100b Hollow part 102a, 102b, 104a, 104b ridge part 106a, 106b Through hole 108a, 108b, 110a, 110b, 112a, 112b Elastic packing a Outside air b Bypass passage c, h Clearance cr Combustion chamber er Engine room o Outlet passage w却水

Claims (8)

1. A supercharger provided between the V banks of the V-type engine and above the cylinder head of each bank, and having a discharge port at the top;
   An outlet passage portion that is attached to the upper portion of the supercharger and extends in the left and right bank directions, and distributes the intake air discharged upward from the supercharger in the left and right bank directions;
   An intake air introduction portion that is curved to the inside of the bank along the outer shape of the rocker cover provided in the cylinder head below the left and right end portions of the outlet passage portion, and is connected to the intake port of the cylinder of each bank;
   An intercooler for cooling intake air discharged from the supercharger, provided between the left and right end portions of the outlet passage portion and the intake air introduction portion, respectively.
   The intercooler is inserted between the outlet passage portion and the intake air inlet portion around the intercooler, and is connected to the outlet casing and the intake air inlet portion to connect the intercooler between the outlet passage portion and the intake air inlet portion. An intake structure for a V-type engine, comprising: a plurality of pillar members for fixing between them.
2. The column member has a hollow portion penetrating in the axial direction,
   The intake of the V-type engine according to claim 1 or 2, further comprising a fastening bolt inserted into the hollow portion and coupled to the outlet passage portion and the intake air introduction portion at both ends. Construction.
3. The outlet passage portion, the intercooler and the intake air introduction portion each have a flange portion on the outer periphery,
   The column member is inserted and fixed in a through hole formed in the flange portion of the intercooler, and both end surfaces of the column member are in contact with the mutually facing surfaces of the outlet passage portion and the flange portion of the intake air introduction portion. And
   3. The intake structure for a V-type engine according to claim 2, wherein the fastening bolt is coupled to the outlet passage portion and the flange portion of the intake air introduction portion at both ends.
4. 4. The intake structure for a V-type engine according to claim 3, wherein the flange portion of the intercooler is in contact with the flange portion of the outlet passage portion via an elastic member.
5. 5. The intake structure for a V-type engine according to claim 1, wherein the column member is configured separately from the intercooler.
6. The intake structure for a V-type engine according to any one of claims 1 to 5, wherein the plurality of column members are arranged at least at four corners of the intercooler.
7. The V-type engine according to any one of claims 1 to 6, wherein the outlet passage portion, the intercooler, and the intake air introduction portion are arranged in an inner region of the rocker cover in a plan view. Intake structure.
8. The intake structure for a V-type engine according to any one of claims 1 to 7, wherein the casing of the intercooler is made of resin.

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