JPS60209623A - Air intake apparatus for v-type engine - Google Patents

Abstract

PURPOSE:To obtain a compact intake apparatus utilizing resonant supercharging supercharging effect, by forming a surge tank at the center of a right and a left banks of a V-type engine, dividing said surge tank into two parts for each bank in the axial direction of the engine, and connecting individual intake passages to the axial end of each surge tank part by the intermediary of a throttle valve. CONSTITUTION:A surge tank 5 elongated in the axial direction of a V-type engine is formed in the hollow space defined between a left bank 1A and a right bank 1B of the engine, and the inside of the surge tank 5 is divided into two parts by a central partition wall 11. The surge tanks 6a, 6b thus formed by dividing the surge tank 5 are communicated respectively with individual intake passages 12a, 12b by the intermediary of throttle valves 13a, 13b. By employing such an arrangement, intake air is supplied to the engine after it is inertia supercharged in intake pipes 6c, 10a, 9a of the left bank and in intake pipes 6d, 10b, 9b of the right bank extending from the surge tanks to intake ports by resonant supercharging effect produced in the intake passages on the upsteam side of the surge tanks 6a, 6b.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an intake system for a V-type engine, and particularly to a connection structure for intake pipes upstream and downstream of a surge tank.

(Prior art) Conventionally, in an in-line multi-cylinder engine, in addition to preventing intake air interference at the gathering part of the intake pipes connected to each cylinder, supercharging due to pressure saw vibration due to the influence of the intake pipe upstream of the surge tank effect (hereinafter referred to as resonance supercharging effect)
For example, an intake device that utilizes
-2892.

However, in the above-mentioned device that utilizes pressure fluctuations in the intake pipe upstream of the surge tank, there is a demand for setting the length of the intake pipe upstream of the surge tank to be relatively long. Since the surge tank itself has a relatively large volume, these intake devices become large and the overall height of the engine increases, which becomes an obstacle to making the engine more compact. In particular, V-type engines have a space between the banks on both sides, and a surge tank is installed in this area, but this has the problem of not being able to provide a sufficient length of the intake pipe due to the layout. .

(Object of the Invention) In view of the above circumstances, the present invention is compatible with the structure of a V-type engine, secures a surge tank of sufficient volume without increasing the overall height of the engine, and at the same time sufficiently lengthens the intake pipe upstream of the surge tank. Therefore, it is an object of the present invention to provide an intake system for a type (1) engine that can satisfactorily improve the engine output due to the resonance supercharging effect caused by pressure vibrations in the intake pipe upstream of the surge tank.

(Structure of the Invention) In the intake system of the present invention, a surge tank is disposed approximately in the center of both banks of a V-type engine, and intake pipes are connected from the surge tank to the banks on both sides. is divided into a first chamber for one bank and a second chamber for the other bank by a partition wall, and
The intake pipe upstream of the surge tank is also divided into independent passages that independently supply intake air to each chamber in the surge tank, and throttle valves that open and close in synchronization with each other are interposed in these independent passages.
The independent passage is characterized in that the independent passage is connected to the surge tank at one end face in the longitudinal direction from the engine output shaft direction.

(Effects of the Invention) According to the present invention, the surge tank is divided into a first chamber connected to the intake pipe for one bank and a second chamber connected to the intake pipe for the other bank, and the surge tank is divided into a first chamber connected to the intake pipe for the other bank. The intake pipe is also divided into independent passages each equipped with a throttle valve that supplies intake air to each of the above chambers independently, and is connected to the surge tank at one end in the longitudinal direction. The length can be increased without increasing the overall height of the engine, and even with the same height, a surge tank with sufficient volume can be secured, making effective use of the space between the banks on both sides. , it is possible to obtain a compact V-type engine with a large resonance supercharging effect due to the long intake pipe length.

(Example) Hereinafter, the present invention will be explained in detail with reference to the drawings.

Figure 1 is an overall front view of a V-type engine with a partial cross section, Figure M2 is a cross-sectional view of its intake system, and Figure 3 is a partial cross-sectional view of the V-type engine.
It is a cross-sectional plan view taken along the -■ line.

A six-cylinder V-type engine 1 has a first cylinder head 3a and a second cylinder head 3b arranged at an angle on a cylinder block 2, and each cylinder 4a is arranged at an angle to the other.
, 4b, a first bank 1A and a second bank 1B are formed.

The intake passage 5 that supplies intake air to each cylinder 4a, 4b of the first and second banks IA, IB on both sides is provided with a surge tank 6 disposed above between the banks IA, IB on both sides. There is. First and second intake pipes 8A and 8B connecting this surge tank 6 and each intake port 7a and 7b of the first and second banks IA and IB are located below the surge tank 6 and on the left side. Intake port 7a of first bank 1A
The intersection 9a of the downstream part of the first intake pipe 8A whose downstream end is connected to the intake port 7b of the second bank 1B on the right side.
The downstream ends of the second intake pipes 8B, whose downstream ends are connected to each other, intersect with each other, and the upstream sides of the intersections 9a and 9b are bent into a U-shape, and the first intake pipes The upstream end of the 0-shaped portion 10a of the second intake pipe 8A is connected to the right side of the surge tank 6, and the upstream end of the 0-shaped portion 10b of the second intake pipe 8B is connected to the left side of the surge tank 6. It is something.

Further, the internal space of the surge tank 6 is defined by a partition wall 11 extending in the front-rear direction (parallel to the engine exit horn axis direction).
It is divided into a first chamber 6a and a second chamber 6b which are independent on the right and left. A first intake pipe 8A connected to the first bank 1A on the left side communicates with the first chamber 6a on the right side through a communication port 6C opened on the right side, and a second intake pipe 8A on the left side communicates with the first chamber 6a on the left side. A second intake pipe 8B connected to the second bank 1B on the right side communicates with W6b through a communication port 6d opened on the left side, and a rear end opening in the longitudinal direction of this surge tank 6 is connected to the inflow side. The intake pipe 72 of the surge tank 6 is connected from the direction of the engine output shaft, and a partition wall extension 12c that is continuous with the partition wall 11 is also provided in the intake pipe 12 on the inflow side.
An independent passage 12a that communicates with the chambers 6a and 6b and supplies intake air.
, 12b. These independent passages 12a, 1
Throttle valves i3a and 13b are respectively disposed in the throttle valves 2b, and both throttle valves 13a and 13b are operated synchronously so as to open and close at the same angle.

In addition, the length of the partition wall extension 12c, that is, the length from the surge tank 6 to the confluence part, is determined so that the pressure vibrations generated by the influence of the intake pipe 12 upstream of the surge tank 6 at a desired engine speed are It is arbitrarily set so that the resonance supercharging effect due to the phenomenon that affects the intake process of the cylinders 4a and 4b reaches its peak in the upward direction. This intake pipe 12 on the inflow side is composed of a throttle body part connected to the surge tank 6 and provided with throttle valves 13a and 13b, and a flexible pipe part (shown by chain lines) upstream from this part. There is.

The throttle valves 13a and 13b are installed near the surge tank 6 as shown in the figure.

It is preferable to improve responsiveness by reducing the volume on the downstream side of 13b.

Each intersection of the intake pipes 8A and 8B downstream of the surge tank 6,
! 19a, 9b are fuel injection nozzles 1 for injecting fuel into the intake ports 7a, 7b of each cylinder 4a', 4b.
4.14 is installed. In addition, in FIGS. 1 and 2, 15 is an intake valve, 16 is a rocker arm, 17 is a camshaft, and 18 is a piston.

According to the embodiment as described above, banks IA on both sides.

Intake air is supplied to each cylinder 4a, 4b of 1B through each passage 12a, 1 of the intake pipe 12 through a throttle valve 13a, 13b.
The intake air flowing into each chamber 6a, 6b of the surge tank 6 through the communication ports 5c, 6d on the side of the surge tank 6 is transferred to the U-Ubes 10a', 1 of the intake pipes 8A, 8B on both sides, respectively.
0b, curves to the lower side of the surge tank 6 along these 0-shaped parts 10a and 10b, and then flows to the junction part 9a,
9b to the intake port 1 of each cylinder head 3a, 3b from 7a, 7b to each cylinder 4a.
, 4b.

Therefore, the inside of the surge tank 6 and the upstream intake pipe 12 are
The first and second chambers 6a have a predetermined length leading to the confluence part,
6b and independent passages 12a and 12b, it is possible to suppress intake air interference and obtain the above-mentioned resonance supercharging effect which is good even in a low speed range, and improves the output direction. In other words, since the torque characteristics change depending on the length to the merging position, the length is set in accordance with the required torque characteristics.

In addition, the intake pipe 12 on the inflow side of the surge tank 6 is connected to a split part in the longitudinal direction from the direction of the engine output shaft, and the overall height of the engine is increased by adopting a partitioned structure in the surge tank 6 and the intake pipe 12. The intake system can be configured without having to do anything. Furthermore, even downstream of the surge tank 6, the intersection portions 9a, 9b and the zero-shaped portions 10a, 10b allow the surge tank 6 to be installed without having to be installed at a significantly higher position.
Since the length of the intake pipes 8A and 8B downstream of the surge tank 6 is long, it is possible to obtain a compact engine with a large -B inertial supercharging effect in the medium and low speed range.

Note that the structure of the intake pipe downstream of the surge tank 6 is not limited to that of the embodiment described above;
The design of the connection structure to B can be changed as appropriate. In particular, since the surge tank 6 and the intersection portions 9a, 9b are integrally provided in the above embodiments, the thickness of the common wall portion can be made thinner than in the case where both are assembled separately. As a result, the overall height of the engine can be made low and the weight can be reduced, which is preferable.

[Brief explanation of the drawing]

FIG. 1 is an overall front view showing a V-type engine partially in section, FIG. 2 is a cross-sectional view of its intake system, and FIG. 3 is a cross-sectional plan view taken along the line ■-■ in FIG. 2. 1... V-type engine 1A, 18...
Banks 4a, 4b...Cylinder 5...Intake passage 6...Surge tanks 7a, 7b...Intake ports 8A, 8B...Downstream Side intake pipe 11...Partition wall 12...Upstream intake pipes 12a, 12b...Independent passage 12C...Partition wall extension. 13a, 13b... Throttle valve III (spontaneous) procedure 11 Author: Mr. Commissioner of the Patent Office October 11, 1980 Patent application 1982-
65624 No. 2, Title of invention Intake device for V-type engine 3, Relationship to the amended case Patent applicant address 3@18 Shinchi, Fuchu-cho, Aki-gun, Hiroshima Name Mazda Motor Corporation [May 15, 1980] Name change procedure (all at once)] 46 Agent 5-2-1-8 Roppongi, Minato-ku, Tokyo Contents of amendment Box 3 in the drawing will be amended as shown in the attached sheet.

Claims (1)

[Claims] (1) In a V-type engine in which two banks each having a plurality of cylinders are arranged at an angle, a surge tank is arranged approximately in the center of both banks, and two seedlings are planted inside this surge tank in the direction of the engine output shaft. At the same time, a first intake pipe is provided to connect the first chamber of the surge tank and the intake boats of the cylinders of one bank, and at the same time, a partition wall is provided that separates the first chamber of the surge tank from the intake boat of the cylinders of the other bank. A second intake pipe is provided that connects the intake port to the intake port of the surge tank, and the intake pipe upstream of the surge tank has a partition wall extension that is continuous with the partition wall in the surge tank and partitions a passage leading to the merging passage into an independent passage. A throttling valve that opens and closes in synchronization with each other is interposed in each of the independent passages, and the independent passage is connected to the surge tank at one end face in the longitudinal direction from the engine output shaft direction. V-type engine intake system.