JP2760589B2 - Air-fuel ratio control device for V-type internal combustion engine - Google Patents

Description

The present invention relates to an air-fuel ratio control device for a V-type internal combustion engine used for automobiles, motorcycles, etc., and particularly to a throttle body or a carburetor and an engine. The present invention relates to a structure of a connection portion with a main body.

<Prior Art> In a V-type internal combustion engine, it is common that intake ports of each bank extend in a C-shape when viewed from the cylinder row direction in accordance with the bank angle. As a structure in which an air-fuel ratio control device such as a throttle body or a carburetor is directly connected to this intake port, for example,
As disclosed in Japanese Patent No. 27576, an end of an intake path such as a carburetor is inserted into an insulator provided at an opening of an intake port of each bank along an extending direction of the intake port. Such a type is known.

<Problems to be Solved by the Invention> In the case of such an air-fuel ratio control device for a conventional plug-in type V-type internal combustion engine, when the end of the intake passage of the throttle body or the carburetor is inserted into the opening of the insulator. Had to insert the one on the bank side first, and then insert the one on the other bank side so as to pry. Therefore, the assembly workability is poor, and due to the problem of the assembly nature, each design element such as the setting of the bank angle of the engine body, the relative position of the intake port of each bank, the shape of the intake passage in the throttle body or the carburetor, etc. Against
It had considerable restrictions.

The present invention has been made in order to solve such inconveniences, and a main object of the present invention is to provide excellent assembling workability and not to restrict the design of the V-type internal combustion engine body and the intake passage structure. It is another object of the present invention to provide an improved air-fuel ratio control device for a V-type internal combustion engine.

[Constitution of the Invention] <Means for Solving the Problems> According to the present invention, such an object is achieved by inserting an insulator member provided in each intake port of two banks arranged in a V-shape into an insulator member. An air-fuel ratio control device for a V-type internal combustion engine, which is mounted in a formula, wherein the insulator member is provided with an intake passage linearly connected to each intake port of the two banks, and each opening of the intake passage is provided. Ends are provided on a common plane, respectively, and an intake path linearly connected to each of the intake paths is provided in the air-fuel ratio control device.Only the insertion end of each of the intake paths with respect to the insulator member is provided. This is achieved by providing an air-fuel ratio control device for a V-type internal combustion engine, characterized in that the axes are respectively opened on the common plane in a state of being orthogonal to the common plane. That.

<Operation> According to such a configuration, the insertion end faces of the air-fuel ratio control device such as the throttle body or the carburetor and the insulator member extend in parallel with each other at a portion between both banks. . Therefore, by pushing along the direction orthogonal to the insertion end face, the insertion connection between the air-fuel ratio control device and the insulator member in each bank is achieved simultaneously with the one corresponding to each bank and without twisting. .

<Embodiment> Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows an air-fuel ratio control device based on the present invention and a V-type multi-cylinder internal combustion engine to which the air-fuel ratio control device is applied. The cylinder heads 57 and 59 of each bank of the V-type multi-cylinder internal combustion engine have intake ports 63 and 65 and exhaust ports, respectively.
67/69, intake valves 71/73, exhaust valves 75/77, etc.
Head covers 79, 81 are attached to the upper part.

At the open ends of the intake ports 63 and 65, a heat insulator 51 is attached.
The throttle body 1 described below for the openings 53 and 55 of
It is designed to be plugged in.

An air cleaner case (not shown) is connected to an upper end 1a of the throttle body 1 as an air-fuel mixture supply device, and insertion ends 3a and 5a at the lower end of each intake passage described later are connected to openings 53 and 55 of the heat insulator 51. By being inserted, each of the cylinders is directly connected to the linear intake ports 63 and 65 via the heat insulator 51. And the upper end of the throttle body 1
In the part covered by the air cleaner case in 1a,
An intake air temperature sensor 83 composed of a thermistor or the like is attached.

As shown in FIGS. 2 to 4, the throttle body 1 has intake passages 3, 5 for guiding intake air to intake ports 63, 65 of each row of the V-type multi-cylinder internal combustion engine. Are arranged alternately for each row, and the intake path 3 corresponding to the intake port 63 in one row and the intake path 5 corresponding to the intake port 65 in the other row are viewed from these arrangement directions. , And alternately intersect in an X-shape and extend into the throttle body 1 (FIG. 4).

The two intake passages 3 and 5 are provided with throttle valves 7 and 9 at their intersections. These throttle valves 7 and 9 connect the throttle body 1 to both intake paths 3.5
Are mounted on a single valve shaft 11 extending therethrough in the arrangement direction, so that they are carried coaxially with each other and are simultaneously opened and closed.

A throttle opening sensor 85 composed of a potentiometer or the like is mounted on one end wall of the throttle body 1 corresponding to one end of the valve shaft 11 in the direction of the row of intake paths to detect the opening of the throttle valves 7 and 9.

As shown in FIG. 4, on both sides of the throttle body 1, fuel injection valves 13 and 15 are inserted and mounted via packings 8 into injection valve mounting holes 14 formed in the throttle body 1, respectively. Each of the throttle valves 7.9 in the intake passages 3.5 has an injection main axis Xf having a predetermined inclination angle θ with respect to the central axis Xi of each of the intake passages 3.5.
The liquid fuel is injected just below.

The first delivery pipe 17 is provided on one side of the fuel injection valve 13.
The liquid fuel is supplied through the second delivery pipe 19 to the fuel injection valve 15 on the other side, respectively. These two delivery pipes 17 and 19 are connected to each other by fuel supply pipes 21, 23 and 25. Further, a pressure regulating valve 27 for adjusting the fuel pressure is attached to the second delivery pipe 19.

As shown in FIG. 3, one side of the throttle body 1 has a throttle valve 7.
A link shaft 43 for operating idle speed control valves 35 and 37 for supplying idle air to the intake passages 3.5 by bypassing the rotary shaft 9 is mounted so as to be rotatable about its own central axis. The link shaft 43 extends in the direction in which the intake passages 3 and 5 are arranged, and is provided with an operating lever piece 47 having an adjusting screw 45 for each of the idle speed control valves 35 and 37. And operation lever piece 47
Is bifurcated with the distal end of the valve body, similarly to a known idle speed control valve. As a result, all of the idle speed control valves 35 and 37 are connected to one link shaft 43.
, And all of the idle speed control valves 35 and 37 are simultaneously operated by the rotation of the link shaft 43.

By the way, the heat insulator 51 is connected to each of the intake ports 63 and 65 so as to straddle between the cylinder heads 57 and 59 of both banks.
Is flanged to the opening. Here, the axis of the intake passage including the heat insulator 51 is inclined in the shape of a letter C along the extending direction of the intake ports 63 and 65, respectively.
Reference numeral 55 denotes a receiving hole for receiving the insertion ends 3a and 5a of the throttle body 1, and is opened on a common plane. Correspondingly, both insertion ends 3a and 5a of the throttle body 1 are also located on a common plane.

Accordingly, the connection of the throttle body 1 to the engine body is made from above the heat insulator 51 through the openings 53a and 5a.
By pushing the insertion ends 3a, 5a of the throttle body 1 against 5a, the operation can be performed at a stretch.

In the above embodiment, the throttle body is used because it is a fuel injection type internal combustion engine. However, the throttle body can be similarly applied to a carburetor type.

[Effects of the Invention] As described above, according to the present invention, the connection end between the intake passage of the air-fuel ratio control device (throttle body or carburetor) and the insulator member provided with the intake passage connected to the intake port of each bank. Since the opening surfaces of the two banks extend in parallel with each other between the banks, the work of inserting the throttle body or the carburetor into each of the insulator members of the banks can be simultaneously and squeezed by simply pushing in a straight line. It can be done without accompanying. Accordingly, not only can the assembling workability be improved, but also the design restrictions such as setting the bank angle of the V-type internal combustion engine, the relative positions of the intake ports of each bank, and the shape of the intake passage in the throttle body or carburetor can be reduced. Has a great effect.

[Brief description of the drawings]

FIG. 1 is a front view showing an air-fuel mixture supply device according to the present invention and a state of attachment of the air-fuel mixture supply device to a multi-cylinder internal combustion engine. 2 is a plan view of the air-fuel mixture supply device, FIG. 3 is a side view, and FIG. 4 is a cross-sectional view taken along line IV-IV of FIG. 1 ... Throttle body, 3,5 ... Intake path 3a / 5a ... Insertion end 7.9 ... Throttle valve, 11 ... Throttle valve shaft 13.15 ... Fuel injection valve 17/19 ... Delivery pipe 27 …… Pressure regulating valve 35 ・ 37 …… Idle speed control valve 43 …… Link shaft 45 …… Adjust screw 47 …… Operation lever piece 51 …… Heat insulator 53 • 55 …… Opening, 63 · 65 …… Intake port 83 …… Intake air temperature sensor 85 …… Throttle opening degree sensor

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F02M 35/10 101 F02M 35/10 102

Claims (1)

(57) [Claims] 1. An air-fuel ratio control device for a V-type internal combustion engine, which is inserted into an insulator member provided at each intake port of two banks arranged in a V-shape, wherein said insulator member is provided. Has an intake passage linearly connected to each intake port of the two banks, and each open end of the intake passage is provided on a common plane. The air-fuel ratio control device is provided with an intake path to be connected, and only the insertion end of each of the intake paths with respect to the insulator member is positioned on the common plane with its axis orthogonal to the common plane. An air-fuel ratio control device for a V-type internal combustion engine, characterized in that the air-fuel ratio control device is open to the inside.