JPH03182676A - Suction device for engine - Google Patents

Abstract

PURPOSE:To reduce the number of parts by a method wherein an independent suction pipe at each cylinder is formed integrally with each of adjoining cylinders between cylinder trains positioned in juxtaposition with each other to make a pair, and a throttle valve is mounted to each of the suction pipes. CONSTITUTION:Suction pipes 10R and 20L running to adjoining cylinders 10R and 10L between cylinder trains on both sides are integrally joined together to form a suction pipe pair 21. Pivotal support shafts 41 are mounted in parallel to the arranging direction of the cylinders to the respective suction pipes 20R and 20L, and a butterfly type throttle valve 40 is mounted on the pivotal support shaft 41. The opening of the throttle valves 40 are regulated through a coupling line 43 between the pivotal support shafts in linkage with each other. This constitution eliminates the need to locate a valve body to each suction pipe and reduces the number of parts.

Description

[Detailed Description of the Invention] Field of Application of Industry-1] The present invention relates to an intake system for an engine in which cylinder rows are arranged in parallel, and more specifically, a so-called multiple stroke throttle in which a throttle valve is provided in each intake pipe to each cylinder. Regarding M4 construction.

[Prior art and its problems] In an internal combustion engine such as a gasoline engine, a throttle valve is provided in the intake passage that supplies the air-fuel mixture into the cylinder.
The throttle valve is opened and closed to adjust the amount of air-fuel mixture sucked into the cylinder, thereby variably adjusting the output.

The throttle valve is generally of the so-called butterfly type, in which a valve plate having approximately the same diameter as the intake passage is rotatably supported in the intake passage, and the passage is opened and closed by the rotation of the valve plate. .

In the case of a multi-cylinder engine, the throttle valve is usually provided upstream of the position where the intake manifold branches into the intake passage for each cylinder, and with this configuration, the throttle valve can be installed regardless of the number of cylinders.

On the other hand, in high-output engines that prioritize performance, some throttle valves are installed in each intake passage for each cylinder (hereinafter referred to as multiple throttle) in order to obtain a good response. A multiple throttle is installed between the intake manifold and the engine body (cylinder head), or
The intake manifold is divided into two parts in the extending direction, and a throttle body is interposed between the two parts.

There are various possible configurations for the throttle body, such as making each intake pipe an independent separate body, or connecting each intake pipe and integrating them into one body, but from the standpoint of ease of assembly and cost, it is preferable to make it into one body. That is desirable.

By the way, as one type of multi-cylinder cylinder arrangement in a vehicle engine, there is a so-called V-type arrangement in which the cylinders are arranged in a V-shape, as disclosed in Japanese Utility Model Application No. 61-5330. For example, intake boats are provided on opposite sides of both banks, and the intake manifold is arranged between the left and right banks.

If you are trying to make a V-type engine with multiple throttles in which the intake manifold is placed between the left and right banks like this, if the throttle body is integrated for each bank, the pivot shaft of the valve plate will need to be adjusted. It is difficult to install a belling to hold the cylinders in a rotatable manner or a sealing member to prevent communication between each cylinder through the pivot shaft fitting hole, so it is necessary to have an independent throttle body for each intake pipe. It was something that could not be achieved. However, this increases the number of parts, takes time to assemble, and increases costs.Also, it is troublesome to adjust the balance of each cylinder, and serviceability during maintenance is extremely poor.

[Object of the Invention] In view of the above-mentioned circumstances, the present invention provides an engine intake that can be configured with a small number of parts, has excellent assembly workability and serviceability, and is capable of converting a V-type engine into multiple throttles at low cost. The purpose is to provide equipment.

[Structure of the Invention] Therefore, the engine intake system according to the present invention integrates independent intake pipes for each cylinder into each adjacent cylinder of the cylinder row nH arranged in parallel to form a pair of intake pipes. However, a throttle valve is provided before the intake of each cylinder of the intake pipe pair.

This makes it possible to install bellings and seals that hold the pivot shaft of the valve plate of the throttle valve, and also allows the respective pivot shafts to be connected in an interlocking manner. By assembling this into an upstream intake system part such as a surge tank to make it an assembly part, it is possible to adjust the opening of each cylinder's throttle valve before assembling it into the engine body, making assembly and adjustment easier. This greatly improves work efficiency.

[Embodiments of the invention] An embodiment of the present invention will be described below based on the drawings.

FIG. 1 shows the r! of the engine according to the present invention. ! 2 is a cross-sectional view of the cylinder head of a V-type six-cylinder engine equipped with an i-air system, and FIG. 2 is a plan view of the intake manifold 20 thereof.

The right bank cylinder head IOR and the left bank cylinder head IOL each have intake boats 11.11 opened on opposing side surfaces thereof, which communicate with the combustion chamber upper surface forming portion on the lower surface, respectively. The intake manifold 20 is installed in the opening part, and both left and right cylinder heads 10L, IOR are attached to the intake manifold 20.
are connected and integrated. The upstream side (upper side) of the intake manifold 20 has a branch passage 31 for each cylinder.
Surge tank 30R, 30L for each bank via...
It is connected to the.

The intake manifold 20 is constructed by integrating independent intake pipes 20R and 20L, which are connected in communication with the intake boats 11 and 11 of adjacent cylinders between left and right cylinder rows arranged in parallel, at adjacent side surfaces. Along with forming pair 21,
The intake pipe pairs 21 are arranged in the longitudinal direction of the engine (cylinder arrangement direction) (3 pairs in this example because it is a V-type 6 cylinder).
are connected and integrated via a connecting portion 22.

Each intake pipe 20R constitutes the intake pipe pair 21.

20L are arranged vertically so that the center of the opening on the upstream side coincides with the center line between both banks, and when viewed from the longitudinal direction of the engine, they overlap on the upstream side as shown in the first figure.

It has an inverted V-shape that widens from side to side as it goes downward from the overlapping position (as it approaches both the left and right cylinder heads IOL and IOR). In addition, there is a surge tank 30R at the top of intake pipe pair z1 and at the upstream opening of intake pipe 20R and ZOL.
, 7 langes 21B for connecting 30L branch passages 31
is formed.

Cylinder head 10L, IO of each intake pipe 20R, 20L
A butterfly-type throttle valve 40 is installed in the vicinity of the attachment point to R, with its pivot shaft 41 parallel to the cylinder arrangement direction (that is, the longitudinal direction of the engine), and the cylinder head lO of the throttle valve 40 is installed. A fuel injection valve 50 is arranged adjacent to the side.

As shown in FIG. 2, both ends of the pivot shaft 41 of each throttle valve 40 are held in the casing 21A of the intake pipe pair 21 via a bear link 23 and a seal 24, and the inside and outside of the intake pipes 20R and 20L are airtight. It can be rotated smoothly while holding various items.

The pivot shafts 41 of the throttle shafts 40 of the bank on one side (the right side in the figure) are interlockably connected via an adjustment mechanism 42, and the pivot shafts 41 are Axis 41... The pivot shaft 41 of the throttle valve 40 of the other bank constituting the intake pipe pair 21...
. . and are operatively connected via a connecting link 43 . Further, it is connected via a throttle link 45 to a pivot shaft 41 of a throttle valve 40 on the left side of the center intake pipe pair 21 or to a throttle lever 44 rotatably supported on the lower side of the surge tank 30L. When the throttle lever 44 is rotated by an accelerator wire (not shown), all the throttle valves 40 are opened and closed in conjunction with each other.

According to the above configuration, the intake pipes 20R and 20L to the adjacent cylinders between the left and right cylinder rows are joined and fixed together to form the intake pipe pair 21, so that the pivot shaft 41 of each throttle valve 40...
Attach the bare link 2 to the casing 21A of the intake pipe pair 21, respectively.
3 and the seal 24, and the opening degree of each throttle valve 40 can be adjusted using the respective pivot shaft 4.
In this embodiment, each intake pipe pair 21... is connected by a connecting part 22... to form the intake manifold 20. , the opening degree of each throttle valve 40 can be adjusted in the state of the intake manifold 20.

Therefore, it can be mounted on the engine body (cylinder head) in an adjusted state, making assembly work extremely easy. In addition, each intake pipe pair 21... is connected to the connecting portion 22...
The same effect can be obtained by constructing an assembly or a single component that is assembled to the upstream intake system parts (surge tank, etc.) instead of having to be connected and integrally constructed.

[Effects of the Invention] As described above, the engine intake system according to the present invention can be constructed with a smaller number of parts, and has improved assembly workability and serviceability, compared to a configuration in which a part body is interposed in front of each intake. It has excellent performance and makes it possible to convert a V-type engine into a multiple slot sotor at low cost.

[Brief explanation of drawings]

Figure 1 shows a V engine to which the engine intake system according to the present invention is applied.
Figure 2, which is a cross-sectional view of the cylinder head portion of the type engine, is a plan view of the intake manifold. 10... To the cylinder (engine body) 20...
・Intake manifold 2015, 20R...Intake pipe 21...Intake pipe pair 40...Throttle valve

Claims (1)

[Claims] An intake system for an engine in which cylinder rows are arranged in parallel, wherein an independent intake pipe for each cylinder is integrated with each adjacent cylinder in the parallel rows to form an intake pipe pair. An intake system for an engine, characterized in that a throttle valve is provided in each intake pipe for each cylinder in a pair of intake pipes.