WO2016103401A1 - Front structure for vehicle provided with v engine - Google Patents

Abstract

This front structure for a vehicle provided with a V engine which is provided inside a front hood of a vehicle body, and in which V banks are formed in the left and right directions of the vehicle body, is provided with: a supercharger which is provided between the V banks of the V engine, and in a position above cylinder heads of the respective banks; and an outlet passage part which is attached to the upper part of the supercharger, is formed extending in the directions of the left and right banks, and is for distributing, in the directions of the left and right banks, air intake discharged upwards from the supercharger. An outlet casing which forms the outlet passage part is disposed facing the inner surface of the front hood. The outlet casing is provided with an upper wall part which is disposed along the inclination direction of the front hood in a side view of the vehicle body, and which maintains a gap with respect to the inner surface of the front hood.

Description

Vehicle front structure with V-type engine

This disclosure relates to the front structure of a vehicle equipped with a V-type engine equipped with a supercharger.

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.

A V-type engine provided with such a supercharger is disclosed in, for example, Patent Document 1 and Patent Document 2.
Since the V-type engine with the supercharger disposed above the V-bank tends to increase in height, it is necessary to keep the overall height low when the V-type engine having the above configuration is disposed in the front part of the vehicle body. .

On the other hand, when a vehicle collides with a pedestrian, as one of the measures to reduce the impact on the pedestrian, a proposal to reduce the damage of the pedestrian by absorbing the collision energy by deforming the front hood is proposed. ing.
For example, Patent Document 3 discloses a configuration in which the amount of deformation of the front hood is increased by dropping the air intake duct disposed immediately below the front hood at the front of the vehicle body from the support portion by the impact at the time of a collision and moving it backward. Is disclosed.

Japanese Patent No. 3362162 Japanese Patent No. 3870451 JP 2007-203943 A

A V-type engine having a supercharger disposed above the V-bank has a large overall height. Therefore, when such a V-type engine is provided at the front of the vehicle body, it is not easy to ensure a large space between the front hood.
Therefore, in order to reduce the impact on the pedestrian in the event of a collision with the pedestrian, it is not easy to secure a space that can be retracted between the engine body even if the supercharger is designed to be retractable from the front hood. Absent.
Furthermore, since the supercharger is heavy, it is necessary to increase the rigidity of the mounting structure with respect to the engine body. Therefore, there is a problem that the mounting structure becomes large and it is difficult to secure a space for retreat.

In view of these technical problems, an object of at least one embodiment of the present invention is to modify the front hood when a V-type engine having a supercharger disposed above a V bank is disposed at the front portion of the vehicle body. It is to secure the amount and to reduce the damage to pedestrians at the time of collision.

A vehicle front structure according to at least one embodiment of the present invention includes: (1) a vehicle front structure including a V-type engine provided in a front hood of a vehicle body and having a V bank formed in a lateral direction of the vehicle body. A supercharger provided between the V banks of the V-type engine and above the cylinder head of each bank; and attached to the upper part of the supercharger and extending in the left and right bank directions; An outlet passage portion for distributing the intake air discharged upward from the supercharger in the left and right bank directions, and an outlet casing constituting the outlet passage portion are disposed to face the inner surface of the front hood, The outlet casing tilts the front hood in a vehicle body side view direction while maintaining a gap with respect to the inner surface of the front hood. And a top wall portion which is arranged along the direction.

According to the configuration (1), since the outlet passage portion and the intake air introduction portion are disposed so as to surround the periphery of the supercharger from the upper part to the lower part of the supercharger, the intake structure including the supercharger occupies it. Space in the height direction can be reduced. In addition, since the upper wall portion of the outlet casing constituting the outlet passage portion is disposed along the inclination direction of the front hood in the vehicle body side view direction with respect to the inner surface of the front hood, the outlet housing and the front hood A sufficient gap can be secured between them. Therefore, the amount of deformation of the front hood at the time of a collision can be increased, so that damage to pedestrians can be reduced.

Moreover, since the said exit casing does not form a partial protrusion toward a front hood, the harmfulness to a pedestrian can be suppressed.
Furthermore, the overall height of the V-type engine can be suppressed as much as possible by the intake structure even if the V-type engine is a narrow engine whose V narrow angle is 60 ° or less.

In some embodiments, in the configuration (1), (2) the entire surface of the upper wall portion of the outlet housing facing the front hood has the same clearance with respect to the inner surface of the front hood. .
According to the configuration (2), a sufficient gap can be secured between the outlet casing and the front hood that constitute the outlet passage portion, and the upper wall portion of the outlet casing has no portion protruding toward the front hood. Therefore, damage to the pedestrian at the time of collision can be suppressed.

In some embodiments, in the configuration (1), (3) the upper surface of the upper wall portion of the outlet casing is formed as a flat surface.
According to the configuration (3), since the upper wall portion of the exit casing does not have a portion protruding toward the front hood, a sufficient gap can be secured between the exit casing and the front hood. Damage can be suppressed.

In some embodiments, in any of the configurations (1) to (3), (4) the outlet casing has a flat three-dimensional shape extending in the left and right bank directions.
According to the configuration (4), by making the outlet casing a flat three-dimensional shape, the height dimension of the outlet passage portion can be reduced, and the gap between the outlet casing and the front hood can be further widened. The flow rate of the intake air flowing through the exit passage can be secured.

In some embodiments, in any one of the configurations (1) to (3), (5) the outlet housing is made of resin or light metal.
According to said structure (5), the said outlet housing can be reduced in weight and manufacture of the said outlet casing becomes easy. Moreover, since the rigidity of the exit housing can be reduced, the deformation amount of the exit housing at the time of a collision with a pedestrian can be increased, thereby reducing damage to the pedestrian.
Furthermore, since the outlet housing can be reduced in weight, it is possible to reduce the weight load on the intake air introduction portion provided below the outlet passage portion and improve the durability reliability. In addition, the weight of the upper part of the engine can be reduced, so that the center of gravity of the engine is lowered, and it is possible to contribute to improvement of vehicle performance (prevention of understeer).

In some embodiments, in any of the configurations (1) to (3), (6) the supercharger is provided between the left and right V banks of the V-type engine, and is provided in a cylinder head of each bank. The lower surface of the rocker cover is positioned above the upper surface of the rocker cover.
According to the configuration (6), since the lower surface of the supercharger is located above the upper surface of the rocker cover provided in the cylinder head of each bank, the supercharger is arranged without increasing the overall width of the V-type engine. In addition, a ventilation space can be formed below the lower surface of the supercharger. Although the temperature of the supercharger rises due to its operation, the supercharger can be cooled by the ventilation that flows into the ventilation space.

In some embodiments, in the configuration (1), (7) the upper wall portion of the outlet casing is disposed along the inclination direction of the front hood as viewed from the front of the vehicle body.
According to the said structure (7), sufficient clearance gap can be ensured between an exit housing and a front hood. Therefore, since the amount of deformation of the front hood at the time of collision can be increased, damage to the pedestrian can be reduced, and the exit casing does not form a partial projection toward the front hood, so that it is possible to suppress harm to the pedestrian.

In some embodiments, in the configuration (1), (8) extending downward from left and right ends of the outlet passage portion, and inside the bank along an outer shape of a rocker cover provided in the cylinder head Further comprising an intake air inlet that is curved and connected to the intake port of each bank cylinder;
The supercharger is disposed inside a closed cross section surrounded by the intake air introduction portion and the outlet casing.
According to the configuration (8), the supercharger can be protected by the closed cross section, and the weight of the supercharger can be received by the intake air inlet, so that the supercharger can be stably supported.

In some embodiments, in the configuration (8), (9) a sound absorbing material is disposed inside the closed cross section.
According to the configuration (9), it is possible to suppress the radiated sound radiated from the supercharger from being transmitted to the outlet passage portion and the intake air introduction portion, and to reduce the load of the supercharger applied to the fuel supply system parts at the time of collision. it can. Further, by inserting the sound absorbing material between the closed cross section and the supercharger, the sound absorbing material can be easily fixed and the sound absorbing material can be prevented from falling off.

According to at least one embodiment of the present invention, the space in the height direction occupied by the intake structure including the supercharger can be reduced, and a sufficient gap can be secured between the outlet housing and the front hood. Therefore, the amount of deformation of the front hood at the time of a collision with a pedestrian can be increased, and damage to the pedestrian can be reduced.

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 sectional drawing corresponding to FIG. 4 of the V-type engine which concerns on another embodiment of this invention.

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 5 show a front structure of a vehicle including 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 and used as shown in FIGS. 1 and 2 with reference to the direction viewed from the driver sitting in the driver's seat.
FIG. 1 shows a front structure of a vehicle according to the present embodiment, and a V-type engine 10 is provided inside a front hood 1. FIG. 2 shows an air supply structure and a cylinder head of the V-type engine 10.

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 (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 embodiment shown in FIG. 1, the supercharger 30 is located above the axis 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. Is done.
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 suspended and supported by an outlet casing 34 constituting the outlet passage portion 32 at a substantially central portion of 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 embodiment, as shown in FIGS. 4 and 5, the upper surface of the upper wall portion of the outlet casing 34 is formed as a flat surface, and the outlet casing 34 has a flat three-dimensional shape.

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 an ignition for igniting and burning the air-fuel mixture supplied to the combustion chamber cr formed in the cylinders 14a and 14b and the air-fuel mixture mixed in the combustion chamber cr. Plugs 46a and 46b are attached.

The driving force for driving the supercharger 30 is transmitted to the supercharger 30 by the 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 via a gear or the like. 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 pulley 50 is bolted to the end plate 51.

As shown in FIG. 5, the suction port 56 through which intake air flows into the supercharger 30 is formed at the rear end portion of the cylindrical cylindrical casing 52, and the discharge port 58 is provided at the upper front portion of the cylindrical casing 52. The intake air is discharged upward from the outlets 54 and 54 through the discharge port 58.
An outlet casing 34 constituting the outlet passage portion 32 is provided above the cylindrical casing 52, and an intake outlet passage o is 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 o is arranged in the vertical direction, and a bypass valve 62 is provided. Further, the bypass passage o communicates with the inlet duct 40 and the suction port 56 for sucking outside air downstream of the bypass valve 62.

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. Further, 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 can be adjusted. The return intake air 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.

The intake passage through which the intake air discharged from the discharge port 58 of the supercharger 30 is guided to the intake ports 38a and 38b of the V-type engine 10 is roughly composed of an outlet passage portion 32 and intake introduction portions 64a and 64b. Has been.
The outlet passage portion 32 distributes the intake air discharged upward from the supercharger 30 in the left and right bank directions.
The intake intake portions 64a and 64b are portions extending downward from the left and right ends of the outlet passage portion 32, passing through the left and right sides of the supercharger 30, and leading to the intake ports 38a and 38b of the cylinders 14a and 14b of each bank. is there.
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 FIGS. 4 and 5, the outlet housing 34 has a flat, substantially rectangular parallelepiped shape in which the left and right bank directions are long, and the direction perpendicular to the left and right banks (axial direction of the crankshaft 30) is short. It has become.
By making the outlet housing 34 have a flat shape, the height of the outlet housing 34 can be suppressed, so that the total height of the V-type engine 10 can be suppressed. In addition, by making the cube shape, it is easy to secure the required intake air amount by securing the length in the short direction even if it is flat.

As shown in FIG. 5, the front hood 1 is gently inclined upward toward the rear of the vehicle body. The upper wall portion of the outlet housing 34 is disposed opposite to the inner surface of the front hood 1 while maintaining a gap c with the front hood 1 and is disposed along the inclination direction of the front hood 1 in a side view of the vehicle body. Yes.

A central opening is formed in the central portion of the bottom wall of the outlet housing 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 housing 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.
Further, slit-like distribution ribs 36 are formed on the inner wall surface of the outlet housing 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 distribute the intake air discharged from the discharge ports 58 in the left and right bank directions.
The distribution ribs 36 improve the distribution of the intake air discharged from the supercharger 30 to the left and right banks, so that the intake air can be evenly supplied to the cylinders 14a and 14b of 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.
Further, as shown in FIG. 1, in the exemplary configuration of the present embodiment, the surface of the upper wall portion of the outlet casing 34 is disposed along the inclination direction of the front hood 1 as viewed from the front of the vehicle body.
Thus, the outer surface of the outlet housing 34 is formed so as to have a gap c of the same interval with respect to the inner surface of the front hood 1 in substantially the entire region except for the regions of the recesses 34b and 34c and the distribution rib 36. Yes.

As shown in FIG. 5, the outlet housing 34 is formed such that the height of the inner wall surface facing the discharge port 58 increases from the front of the vehicle body to the rear in the short direction. Therefore, the inner wall surface of the outlet housing 34 is inclined with respect to the rotation axis direction of the rotors 54, 54 of the supercharger 30.
Since the intake air discharged from the discharge port 58 collides with the inner wall surface of the outlet housing 34 in an inclined state rather than at a right angle, the area where the intake air hits the inner wall surface becomes large, and the effect of reducing the collision sound generated at the time of the collision is increased. Is obtained. That is, the radiated sound due to the discharge pressure from the supercharger can be reduced.

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 housing 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 housing 34 is made of a light metal such as resin or aluminum. As a result, the outlet housing 34 can be reduced in weight, and the outlet housing 34 is integrally formed of 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 both the left and right sides, and water-cooled intercooler cores 74a and 74b are housed in casings 72a and 72b having a square cross section. Cooling water w is supplied from the outside to the intercooler cores 74a and 74b, and is discharged after cooling the intake air. 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 upward.

As shown in FIG. 2, flanges 82a and 82b are formed around the lower ends of the casings 72a and 72b. The flanges 82a and 82b have a plurality of cylindrical collars 84a extending around the casings 72a and 72b. And 84b are erected for reinforcement. When the collars 84a and 84b are made of metal, high rigidity can be obtained.
The collars 84a and 84b have hollow portions through which the bolts 86a and 86b pass. The upper ends of the collars 84 a and 84 b abut on flange portions 88 a and 88 b provided around the lower end portion of the outlet housing 34.

Flange portions 82a and 82b formed around the lower end portions of casings 72a and 72b abut on flange portions 90a and 90b formed around the upper end portions of upper intake air introduction portions 66a and 66b. Then, the bolts 86a and 86b are inserted from the upper surfaces of the flange portions 88a and 88b, and screwed into the female screw portions formed in the flange portions 90a and 90b of the lower intake introduction portions 68a and 68b, whereby the casings 72a and 72b are exited. It is fixed between the housing 34 and the lower intake inlets 68a and 68b.
The casings 72a and 72b are integrally formed with the intercooler cores 74a and 74b, for example, with resin, so that the manufacture of the intercoolers 70a and 70b is facilitated.

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 flange portions 90a and 90b of the lower intake introduction portions 68a and 68b are fastened to the flange portions 82a and 82b of the upper intake introduction portions 66a and 66b by the bolts 86a and 86b. The flange portions 92a and 92b of the lower intake introduction portions 68a and 68b are bolted to the 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 flange portions 92a and 92b of the lower intake introduction portions 68a and 68b to the collective portion. Forming a wall surface. 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, 54, the intake air is sucked into the cylindrical casing 52 through the suction port 56, discharged upward from the discharge port 58, and discharged into the outlet passage o formed in the outlet casing 34. The
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 housing 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 supercharger 30 from the upper part to the lower part of the supercharger 30. The space in the height direction occupied by the intake structure can be reduced. Further, the supercharger 30 is supported by being suspended from the outlet passage portion 32, and a space for the support portion is not required below the supercharger 30. Therefore, the overall height of the V-type engine 10 can be reduced.
Moreover, since the upper wall part of the outlet casing 34 which comprises the exit channel | path part 32 is arrange | positioned with respect to the inner surface of the front hood 1 along the inclination direction of the front hood 1 in a vehicle body side view, the outlet casing 34 and the front hood A sufficient gap c can be secured between Therefore, since the deformation amount of the front hood 1 at the time of collision can be increased, damage to pedestrians can be reduced.

Moreover, since the upper surface of the upper wall part of the exit casing 34 is formed as a flat surface and does not form a partial projection toward the front hood 1, it is possible to suppress harm to the exit casing 34 and the pedestrian.
Furthermore, since the space occupied by the intake structure can be reduced, the overall height of the V-type engine can be suppressed even if the V-type engine 10 is a narrow engine whose V narrow angle is 60 ° or less.

Furthermore, in the exemplary configuration of the embodiment, the upper wall portion of the outlet casing 34 is disposed along the inclination direction of the front hood 1 as viewed from the front of the vehicle body. Therefore, the entire surface of the upper wall portion of the outlet casing 34 facing the front hood 1 is the same as the inner surface of the front hood 1 except for the portions where the recesses 34b and 34c are formed and the portions where the distribution ribs 36 are provided. Since the gap c is provided at an interval, a further sufficient gap can be secured between the outlet casing 34 and the front hood 1 and the outlet casing 34 does not form a protrusion on the front hood side. Harmfulness can be further suppressed.
Further, since the supercharger 30 is suspended and supported by the bolts 80 accommodated in the recesses 34b, a space for the support portion of the supercharger 30 is not required below the supercharger 30, so that the total height of the V-type engine 10 is increased. Can be reduced.

Further, since the outlet casing 34 has a flat three-dimensional shape extending in the left and right bank directions, the height of the outlet passage portion 32 can be reduced, and the gap c between the outlet casing 34 and the front hood 1 can be further widened. In addition, since the outlet casing 34 extends in the left and right bank directions, the flow rate of the intake air flowing through the outlet passage o can be secured.

Further, since the outlet housing 34 is made of resin or light metal, the outlet casing 34 can be reduced in weight, and the outlet casing 34 can be easily manufactured. Furthermore, since the rigidity of the exit housing 34 can be reduced, the amount of deformation of the exit housing at the time of a collision with a pedestrian can be increased, thereby reducing damage to the pedestrian.
Further, since the outlet housing 34 can be reduced in weight, the weight load on the intake air introduction portions 64a and 64b provided below the outlet passage portion 32 can be reduced, and durability reliability can be improved. In addition, the weight of the upper part of the engine can be reduced, so that the center of gravity of the engine is lowered, and it is possible to contribute to improvement of vehicle performance (prevention of understeer).

Furthermore, since the lower surface of the supercharger 30 is disposed above the upper surface position H of the rocker covers 28a and 28b, the supercharger 30 can be disposed without increasing the overall width of the V-type engine 10. Moreover, 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 into the ventilation space.

As shown in FIGS. 1 and 4, when viewed in the crankshaft direction, the supercharger 30 includes an outlet housing 34 that forms the outlet passage portion 32, and upper intake introduction portions 66 a and 66 b that include intercoolers 70 a and 70 b. 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, the supercharger 30 can be stably supported, and the supercharger 30 can be protected by the closed cross-sectional structure.
In addition, the outlet housing 34 constituting the outlet passage portion 32, the intercoolers 70a and 70b, the upper intake inlet portions 66a and 66b, and the lower intake inlet portions 68a and 68b are formed as separate structures, and these are connected by fastening bolts 80. Since the structure is fastened and assembled, the assembly can be facilitated even if the piping and parts of the fuel injection device are housed inside the left and right banks.

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.

Note that the supercharger 30 may be fixed to the intake air inlets 64a and 64b instead of being suspended and supported by the outlet casing 34. 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.

In addition to the outlet casing 34, the inlet duct 40, the cylindrical casing 52, and the rear casing 60 may be made of resin or light metal. Thereby, since the supercharger 30 can be further reduced in weight, the effect obtained by reducing the weight of the supercharger 30 can be further enhanced.
Further, by integrally manufacturing the outlet casing 34, the inlet duct 40, the cylindrical casing 52, and the rear casing 60, it is possible to reduce fastening parts such as bolts and seal members that seal between these members, thereby further reducing the weight. In addition, reliability such as assembly accuracy can be improved.

Next, another embodiment of the present invention will be described with reference to FIG.
In FIG. 6, the sound absorbing material 100 is filled in a closed cross section surrounded by a cylindrical casing 52, a lower surface of the outlet casing 34, casings 72 a and 72 b of the intercoolers 70 a and 70 b, and upper intake inlet portions 66 a and 66 b. For the sound absorbing material 100, for example, glass wool or urethane is used. Other configurations are the same as those of the above embodiment, and the same devices and the same members are denoted by the same reference numerals.

According to the present embodiment, it is possible to suppress the radiated sound radiated from the supercharger 30 from being transmitted to the outlet passage portion 32, the intake air introduction portions 64a and 64b, and the load of the supercharger 30 applied to the fuel supply system components at the time of collision. Can be reduced. Further, by inserting the sound absorbing material 100 between the closed cross section and the supercharger 30, the sound absorbing material 100 can be easily fixed and the sound absorbing material 100 can be prevented from falling off.

According to one embodiment of the present invention, when a V-type engine having a supercharger disposed above a V bank is disposed at the front of the vehicle body, the amount of deformation of the front hood is ensured and given to a pedestrian at the time of collision. Damage can be reduced.

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 Cylindrical body 74a, 74b Intercooler core 76a, 76b Supply port 78a, 78b Discharge port 80, 86a, 86b Bolt 82a, 82b , 88a, 88b, 90a, 90b, 92a, 92b Flange portion 84a, 84b Collar 94 Front / rear connecting portion 96 Reinforcing rib 98 Left / right connecting portion 100 Sound absorbing material a Outside air b Bypass passage c Clearance cr Combustion chamber er Engine room o Outlet passage w Cooling water

Claims (9)

1. A front structure of a vehicle including a V-type engine provided in a front hood of a vehicle body and having a V bank formed in a lateral direction of the vehicle body;
   A supercharger provided between the V banks of the V-type engine and above the cylinder head of each bank;
   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;
   The outlet casing constituting the outlet passage portion is disposed to face the inner surface of the front hood,
   The V-type engine is characterized in that the outlet casing has an upper wall portion arranged along the inclination direction of the front hood in a side view of the vehicle body while maintaining a gap with respect to the inner surface of the front hood. The front structure of the vehicle provided.
2. 2. The V-type engine according to claim 1, wherein the entire surface of the upper wall portion of the outlet housing facing the front hood has the same gap with respect to the inner surface of the front hood. Vehicle front structure.
3. The front structure of a vehicle having a V-type engine according to claim 1 or 2, wherein the upper surface of the upper wall portion of the outlet casing is formed as a flat surface.
4. The vehicle front structure with a V-type engine according to any one of claims 1 to 3, wherein the outlet casing has a flat three-dimensional shape extending in the left and right bank directions.
5. 4. The front structure of a vehicle having a V-type engine according to claim 1, wherein the outlet housing is made of resin or light metal.
6. The supercharger is disposed between the left and right V banks of the V-type engine so that a lower surface is positioned above an upper surface of a rocker cover provided in a cylinder head of each bank. Item 4. A vehicle front structure including the V-type engine according to any one of Items 1 to 3.
7. 2. The front structure of a vehicle equipped with a V-type engine according to claim 1, wherein the upper wall portion of the outlet casing is disposed along the inclination direction of the front hood as viewed from the front of the vehicle body.
8. An intake air inlet that extends downward from the left and right ends of the outlet passage and curves inward along the outer shape of the rocker cover provided on the cylinder head and is connected to the intake port of the cylinder of each bank Further comprising
   The front structure of a vehicle having a V-type engine according to claim 1, wherein the supercharger is disposed inside a closed cross section surrounded by the intake air introduction portion and the outlet casing.
9. 9. A front structure of a vehicle equipped with a V-type engine according to claim 8, wherein a sound absorbing material is disposed inside the closed cross section.

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