JPH10122071A - V-engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the assembly of an intake manifold, an injector, a surge tank and the like into a V-engine, reduce the size of the engine and improve the workability and the intake efficiency of the engine. SOLUTION: A V-engine 1 comprising a first cylinder 9, a second cylinder 10 and a gas reflux passage 40 is integrally provided with an intake manifold 30 which converges on the longitudinal center line L1 of the engine 1 on the side of an upstream surge tank 31 and forms an obtuse angle between its cylinder head-side flanges 30b and 30c while straddling the engine longitudinal center line L1. The gas reflux passage 40 is arranged near the cylinder head-side flanges 30b and 30c on the engine longitudinal center line L1. The gas reflux passage 40 is perforated with communication holes 41 and 42 through which it communicates with openings of the cylinder head-side flanges 30b and 30c. The ends of the gas reflux passage 40 on the downstream sides of the communication holes 41 and 42 are employed as gas reflux ports. The V-engine 1 is further provided with a first and a second injector 50 and 51 for injecting fuel into intake passages 20 and 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a V-type engine, and more particularly to a V-type engine provided with an exhaust gas or blow-by gas recirculation device.

[0002]

2. Description of the Related Art For example, in a V-type engine mounted on a vehicle, a first block and a second cylinder head are mounted on a cylinder block to form a first cylinder and a second cylinder in a substantially V shape, and an exhaust system is formed. Some have a gas recirculation passage for recirculating exhaust gas from the air or blow-by gas generated in the fuel tank to the intake system.

[0003]

A V-type engine equipped with such a gas recirculation device communicates with first and second cylinder heads between a first cylinder and a second cylinder formed in a substantially V shape. There are cases where first and second intake manifolds are arranged, and first and second injectors for injecting fuel into an intake passage are further provided. In this case, since the first and second injectors are arranged in a narrow space, the first and second intake manifolds are arranged. Care must be taken to assemble the intake manifold, the first and second injectors, and also the surge tank.

In some cases, the first and second intake manifolds and the first and second injectors cannot be arranged compactly in a narrow space between the first cylinder and the second cylinder. Then, it becomes difficult to secure an engine arrangement space in the vehicle.

Further, in disposing the first and second intake manifolds and the first and second injectors in a narrow space between the first cylinder and the second cylinder, the first and second cylinder heads, the first and second cylinder heads, Care must be taken to improve the workability and intake efficiency of the second intake manifold, the first and second injectors, and the fuel injection efficiency.

The present invention has been made in view of the above points, and improves the assemblability of an intake manifold, an injector, a surge tank, and the like, enables a compact engine, and further improves workability and intake efficiency. It is another object of the present invention to provide a V-type engine that improves fuel injection efficiency.

[0007]

In order to solve the above problems and to achieve the object, the invention according to claim 1 is characterized in that a first and a second cylinder head are mounted on a cylinder block to form a substantially V-shape. While forming the first cylinder and the second cylinder,
In a V-type engine having a gas recirculation passage for recirculating gas to an intake system, a collective intake manifold connected to the first and second cylinder heads is integrally formed on an engine vertical center line at an upstream surge tank side. A cylinder head side flange portion of the collective intake manifold is formed so as to intersect with the engine vertical center line and form an obtuse angle, and the gas recirculation passage is provided on the engine vertical center line near the cylinder head side flange portion. A communication hole communicating with the gas recirculation passage from the opening of the cylinder head side flange portion, and a downstream end of the communication hole as a gas recirculation port of the gas recirculation passage; First and second injectors for injecting fuel into an intake passage formed in the first and second cylinder heads are provided on a head side flange portion. Wherein the surge tank side flange portion and the first and second injectors set intake manifold first
It is characterized in that it is arranged within an engine outline connecting the cylinder and the second cylinder.

The collective intake manifold communicates with the intake passages formed in the first and second cylinder heads, and can be assembled without displacement of the intake passage. Further, the assemblability of the collective intake manifold, the first and second injectors, the surge tank, and the like is improved, and the bending of the intake passage can be increased, thereby improving the intake efficiency.

Further, the surge tank-side flange portion of the collective intake manifold and the first and second injectors can be arranged within the outline of the engine connecting the first cylinder and the second cylinder, so that the engine can be made compact. Therefore, it is easy to secure a space for disposing the engine in the vehicle.

Further, the gas recirculation passage is shared, the gas recirculation passage and the communication hole can be machined from the outside, and the number of machining locations is reduced, thereby improving workability.

Further, the first and second injectors are provided with a first
In addition, the injection angle with respect to the intake passage formed in the second cylinder head can be reduced, so that the influence of intake air can be reduced and the fuel injection efficiency can be improved.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a V-type engine according to the present invention will be described. 1 is a sectional view of a V-type engine, FIG. 2 is a plan view of a V-type engine, FIG. 3 is a sectional view of a collective intake manifold, FIG. 4 is a side view of the collective intake manifold, and FIG. It is.

In the drawings, reference numeral 1 generally indicates an engine assembled in accordance with an embodiment of the present invention, which is a multi-cylinder V-type engine, in which an oil pan 3 is mounted on a crankcase 2, and A cylinder block 6 having cylinder banks 4 and 5 inclined at a V angle is provided. In this embodiment, the engine 1 is a V-type 8-cylinder, and a first
The first cylinder 9 and the second cylinder 10 are formed in a substantially V shape by mounting the second cylinder heads 7 and 8.

In the cylinder banks 4 and 5, pistons 11 and 12 are provided so as to be reciprocable, respectively. The pistons 11 and 12 are connected to a crankshaft 15 via connecting rods 13 and 14, respectively. Spark plugs 16, 17 are provided in the first and second cylinder heads 7, 8 in combustion chambers 18, 19.
It is provided to face. In addition, intake passages 20, 21 and exhaust passages 22, 23 are provided in the first and second cylinder heads 7, 8 so as to open to the combustion chambers 18, 19, respectively.
This opening is provided with cams 26,
It is opened and closed by an intake valve and an exhaust valve (not shown) operated by 27.

The exhaust passages 22 and 23 have exhaust manifolds 2.
8 and 29 are connected, and a collective intake manifold 30 is connected to the intake passages 20 and 21. Collective intake manifold 3 connected to the first and second cylinder heads 7, 8
0 is integrally formed on the surge tank 31 side on the upstream side so as to gather on the engine vertical center line L1. Cylinder head side flange portion 30a of collective intake manifold 30
Are formed so as to be orthogonal to the engine vertical center line L1 as shown by a plane line L2, and the cylinder head side flange portions 30b and 30c are formed with respect to the engine vertical center line L1 as shown by the plane lines L3 and L4. Intersecting plane lines L3 and L4
Are formed so that the angle θ forms an obtuse angle. The surge tank 31 is arranged above the first cylinder 9, and
It communicates with the first and second intake passages 30d, 30e of the collective intake manifold 30 via 2a, 32b.

In the vicinity of the cylinder head side flanges 30b, 30c of the collective intake manifold 30, a single gas recirculation passage 40 is disposed on the engine longitudinal center line L1, and the openings of the cylinder head side flanges 30b, 30c are provided. 30b1,
A communication hole 41 communicating from 30c1 to the gas recirculation passage 40,
42, and the downstream end portions 41 of the communication holes 41 and 42 are formed.
a, 42 a function as gas recirculation ports of the gas recirculation passage 40. The communication holes 41 and 42 are formed by notches 30b2 and notches 30b2 formed in the cylinder head side flange portions 30b and 30c.
From 30c2, it can be easily formed using a drill.

The gas pipe 4 is located upstream of the gas recirculation passage 40.
The exhaust gas is communicated with the exhaust manifolds 28 and 29 through the exhaust system 3 to recirculate exhaust gas from the exhaust system to the intake system. The gas recirculation passage 40 may recirculate blow-by gas generated in the fuel tank.

Further, the intake passages 20, 2 formed in the first and second cylinder heads 7, 8 are provided in the cylinder head side flange portions 30b, 30c of the collective intake manifold 30, respectively.
First and second injectors 50 and 5 for injecting fuel into fuel injector 1
1 and a first and second injector 5 respectively.
Fuel is supplied to 0 and 51 via fuel pipes 52 and 53. The surge tank side flange portion 30a of the collective intake manifold 30, the first and second injectors 50 and 51, and the fuel pipes 52 and 53 are arranged in an engine outline L5 connecting the first cylinder 9 and the second cylinder 10. I have.

As described above, the first and second cylinder heads 7 are formed by forming the cylinder head side flange portions 30b and 30c of the collective intake manifold 30 so as to intersect the engine longitudinal center line L1 and form an obtuse angle. , 8 communicate with the intake passages 20, 21 formed in the intake passages 2, 8.
0 and 21 can be assembled without displacement. The assemblability of the collective intake manifold 30, the first and second injectors 50 and 51, the surge tank 31, and the like is improved, and the bending of the intake passage can be increased, so that the intake efficiency is improved.

The surge tank side flange 30a of the collective intake manifold 30 and the first and second injectors 5
Numerals 0 and 51 are arranged in an engine outline L5 connecting the first cylinder 9 and the second cylinder 10, so that the engine can be made compact and the space for disposing the engine in the vehicle can be easily secured.

Furthermore, the cylinder head side flange portion 30
In the vicinity of c and 30d, a single gas recirculation passage 40 is disposed on the engine longitudinal center line L1.
0 is shared, and the gas recirculation passage 40 and the communication hole 4
1, 42 can be machined from the outside, and the number of machined parts is reduced, so that workability is improved.

Also, the first and second injectors 50, 5
1 can reduce the injection angle α with respect to the intake passages 20 and 21 formed in the first and second cylinder heads 7 and 8, and can reduce the influence of intake air, thereby improving the fuel injection efficiency. .

[0023]

As described above, according to the first aspect of the present invention, the first and second cylinder head side flanges of the collective intake manifold are formed so as to intersect with the engine vertical center line and form an obtuse angle. It can communicate with the intake passage formed in the second cylinder head and can be assembled without displacement of the intake passage. Also, collective intake manifold,
The assemblability of the first and second injectors and further the surge tank and the like is improved, and the bending of the intake passage can be increased, so that the intake efficiency is improved.

Further, since the surge tank side flange portion of the collective intake manifold and the first and second injectors are arranged within the engine outline connecting the first cylinder and the second cylinder,
The engine can be made compact, and the space for arranging the engine in the vehicle can be easily secured.

Further, since a single gas recirculation passage is disposed on the longitudinal center line of the engine near the flange portion on the cylinder head side, the gas recirculation passage is shared, and the gas recirculation passage and the communication hole can be machined from the outside. In addition, the number of processing portions is reduced, and the processability is improved.

Further, the first and second injectors are provided with a first
In addition, the injection angle with respect to the intake passage formed in the second cylinder head can be reduced, so that the influence of intake air can be reduced and the fuel injection efficiency can be improved.

[Brief description of the drawings]

FIG. 1 is a sectional view of a V-type engine.

FIG. 2 is a plan view of a V-type engine.

FIG. 3 is a sectional view of a collective intake manifold portion.

FIG. 4 is a side view of the collective intake manifold.

FIG. 5 is a diagram showing a collective intake manifold.

[Explanation of symbols]

 1 V-type engine 6 Cylinder block 7, 8 First and second cylinder head 9 First cylinder 10 Second cylinder 20, 21 Intake passage 30 Collective intake manifold 30b, 30c Cylinder head side flange portion 30b1, 30c1 Opening 40 Gas recirculation Passages 41, 42 Communication holes 50, 51 First and second injectors

Claims (1)

[Claims] 1. A V-type having first and second cylinder heads mounted on a cylinder block to form first and second cylinders in a substantially V-shape and having a gas recirculation passage for recirculating gas to an intake system. In the engine, the collective intake manifold connected to the first and second cylinder heads is integrally formed in a shape that is gathered on the engine vertical center line on the surge tank side on the upstream side, and the cylinder head side flange portion of the collective intake manifold is It is formed so as to intersect with the engine vertical center line and form an obtuse angle, and the gas recirculation passage is arranged on the engine vertical center line near the cylinder head side flange portion, from the opening of the cylinder head side flange portion. A communication hole communicating with the gas recirculation passage is formed, and a downstream end of the communication hole is used as a gas recirculation port of the gas recirculation passage. Wherein the de-side flange portion first and second
First and second injectors for injecting fuel into an intake passage formed in the cylinder head; and a surge tank-side flange portion of the collective intake manifold and first and second injectors, the first and second cylinders being connected to each other. A V-type engine, wherein the V-type engine is arranged within an engine outline connecting the two.