JPH03199632A - Intake device for engine - Google Patents

Abstract

PURPOSE:To obtain a V-type engine with a multiple throttle by slidably interposing a throttle plate having openings corresponding to the intake pipe between an intake manifold in which a plurality of intake pipes are collectively integrated for each unit cylinder row and the engine body to which the intake manifold is fitted. CONSTITUTION:A throttle plate 40 is interposed between an intake manifold 20 and a cylinder head 10, and is held by linear bearings 42, 42 so as to be slidable in the longitudinal direction. When the throttle plate 40 is fully inserted into the manifold 20, all the openings 11A (not shown) of intake ports 11 are completely closed by the manifold 20, and when the plate 40 is drawn out by a prescribed amount from this conduction, the valve holes 41 thereof completely coincide with the openings 11A. Accordingly, by sliding the plate 40 by means of a driving mechanism, the opening area of the intake ports 11 can be suitably regulated, and also since the valve body is made up of the manifold 20 and the cylinder head 10, the structure can be made compact.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an engine intake device that opens and closes an intake passage by sliding a throttle plate.

[Prior art and its problems] Internal combustion engines such as gasoline engines are equipped with a throttle valve 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.

In a multi-cylinder engine, the throttle throttle is usually provided at a position where the intake passages for each cylinder are separate or at a position where the intake passages are merged upstream of each cylinder and merged into a single intake passage. In other words, in this configuration, it is sufficient to provide one set of throttle harts regardless of the number of cylinders, or in high-output types that prioritize performance, such as racing engines, in order to obtain a good response. There is also one in which a throttle throttle is provided in each intake passage to each cylinder (hereinafter referred to as a multiple throttle). Such a multiple throttle is constructed by interposing a half body between an intake manifold and an engine body (cylinder head) or between an intake manifold divided into two in the direction in which the intake passage extends. Basically, a half-podium is constructed independently for each intake pipe, or there are also systems in which each intake pipe is connected and integrated.

On the other hand, 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 Publication 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.

However, if you try to use the above-mentioned multiple throttle in a V-type engine that is placed between the intake manifold or the left and right banks, there is a problem in that it will interfere with the valve bodies of both the left and right banks, making it difficult to install. There was. In other words, there is no space to install a valve body between both banks,
Furthermore, even if it is possible to install it, it must be placed in a narrow space between the left and right banks, making assembly work difficult and resulting in poor maintenance and serviceability.

[Purpose of the Invention] In view of the above-mentioned circumstances, the present invention provides an engine intake system that enables multiple throttles in a V-type engine, is easy to assemble, and has good maintenance and serviceability. purpose.

[WJ Power of the Invention] For this reason, the engine intake system according to the present invention has a structure in which a plurality of intake pipes are integrated into a plurality of intake pipes for each unit cylinder row between the intake manifold and the engine body to which the intake manifold is installed. , a throttle plate having an opening corresponding to the intake pipe is slidably inserted therein.

As a result, the valve body is made up of the intake manifold and the engine body (cylinder head), making it an independent part body.

Since it is not necessary, it can be made compact *a, and by making the intake manifold and cylinder head into an assembly, assembly work is easy, and maintenance and serviceability are also improved.

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

FIG. 1 is a cross-sectional view of a cylinder head portion of a V-type engine to which an engine intake system according to the present invention is applied.

The cylinder head IOR of the right bank and the cylinder head IOL of the left bank are respectively attached and fixed to the upper portions of both left and right banks of the Sisson Tatsulock (not shown).

In both the left and right cylinder heads IOL and IOR, an intake boat 11.11 is formed with an opening that communicates the combustion chamber upper surface forming portion on the lower surface with the opposing side surface of both banks, and the intake boat 11.11 is formed with an opening. Intake manifolds 20 and 20 having intake passages communicating with the intake boats 11 and 11 are fixed to the side surfaces of the intake boats 11 and 11, respectively.

A surge tank 3o having a predetermined volume is provided upstream of both intake manifolds 20.20.

The surge tank 30 is connected to each cylinder via an intake pipe 31 branched from the surge tank 30, and therefore,
Both left and right cylinder heads IOL and IOR are connected by respective intake manifolds 20 and 20 and a surge tank 30.

Here, both left and right cylinder head IOL.

The cylinder head 10R is completely symmetrically constructed, and will be described below with reference to one side as the cylinder head 10, unless otherwise required.

The intake manifold 20 is formed by integrating independent intake passages 21 leading to individual cylinders in units of banks. A wide flange for fixing is formed on the mounting surface side to the cylinder head 10, and its length is approximately equal to that of the cylinder head 10.

A throttle plate 40 is interposed between the intake manifold 20 and the cylinder head 10 so as to be slidable in the longitudinal direction of the throttle plate 40, as shown at 212I in the Ll-TI cross-sectional view of FIG.

The throttle plate 40 has a planar shape that is wider than the diameter of the intake boat 11, and the throttle plate 40 is wider than the diameter of the intake boat 11 of all cylinders.
A valve hole 41 having approximately the same diameter as the opening 11A of the intake boat 11 is formed on a plate having a predetermined thickness and a substantially rectangular outline having a length that can close the intake boat 11 of each cylinder at once.
The openings are formed at intervals equal to the intervals of .

A recess is formed in the mounting surface of the intake manifold 20 to the cylinder head 10 so that the throttle plate 40 can be accommodated so as to be flush with the outer surface of the intake manifold 20. By attaching the throttle plate 40 to the cylinder head IO, the throttle plate 40 is held between the two so that it cannot fall off.

The throttle plate 40 is interposed between the intake manifold 20 and the cylinder head 10 with linear bear links 42 and 42 mounted on both long sides of the throttle plate, and is held by the linear bear links 42 and 42, and is held by the linear bear links 42 and 42. It can be slid in any direction.

When the throttle plate 40 slides and is fully inserted into the intake manifold 20, the openings 11A of all the intake boats 11 are completely closed by the intake manifold 20. When the throttle plate 40 is pulled out (slided outward) by a predetermined amount, its Harz hole 41.
...and the opening llA... of the intake boat 11...

Note that when the throttle plate 40 is pushed into the intake manifold 20 as far as it will go and the intake boat 11 is closed, the throttle plate 40 protrudes outward from the end of the pull-out side or the end of the intake manifold 20, and the protruding portion is The throttle plate 40 can be slid through the throttle plate 40.

Also, the intake manifold 20 and cylinder head 10
An O-link 15 is interposed around the joint surface of the throttle plate 40 except in the sliding direction of the throttle plate 40, and the inside and outside of the O-link 15 are kept airtight.

According to the configuration as described in -h, by slidingly driving the throttle plate 40 by a drive mechanism (not shown), it becomes possible to adjust the opening area of the intake boat 11 as appropriate. According to this configuration, since the valve body is constituted by the intake manifold 20 and the cylinder head 10, the separate Hartz body can be divided into two parts between the intake manifold and the engine body (cylinder head io) or in the direction in which the intake passage extends. There is no need to interpose between the two intake manifolds, resulting in an extremely compact structure.
By making the cylinder head 10 and the cylinder head 10 free from abrasions, assembly work becomes easy, and maintenance and serviceability are also improved. Furthermore, the intake boat 11
Since the throttle hartz (that is, the throttle plate 40) is placed in a position extremely close to the exhaust stroke, it is possible to minimize the amount of combustion gas blown back toward the intake manifold 20 when the intake hartz overlaps at the end of the exhaust process. .

In the above embodiment, the fuel injection valve 50 is arranged adjacent to the upstream side of the throttle plate 40, and the fuel force injected from the fuel injection valve 50 directly hits the throttle plate 40, and this throttle plate It is possible that it accumulates in the 40 part. To solve this problem, step 5 is to connect the intake manifold 20 and the cylinder head 10 so that the upstream side of the throttle plate 40 where fuel tends to accumulate is connected to the downstream side of the intake boat 11. A passage 12.22 is formed as an opening, and the fuel accumulated in the throttle plate 40 is sucked out to the intake boat 11 side and released through the communication passage 12.22. In addition, a gentle convex portion 11B is protruded from a part of the bottom side of the intake boat 11 to slightly narrow the diameter of the boat, and the fuel flowing through this western portion 11B is blown off by the intake air to vaporize and atomize it. It is designed to encourage

Here, in the configuration in which the opening degree of the intake passage is adjusted by sliding the throttle plate 40 as in this embodiment, the throttle plate 40 or the cylinder head 1 is
If a bearing is used over the entire length (the linear link 42 of the second embodiment), the throttle plate 40 and cylinder head l
Since a gap is required between the cylinders and the cylinders, adjacent cylinder pipes communicate with each other through this gap, which can lead to an increase in idling rotation speed and interference between cylinders, especially when the intake flow rate is low, such as when fully closed. It happens. This can be prevented by configuring as shown in the third figure.

That is, roller linear bearing links 43 are disposed intermittently in the sliding direction between the long peripheral side of the throttle plate 40 and the cylinder head IO, and roller linear bearings 43 are disposed on the long peripheral side of the throttle plate 40 intermittently in the sliding direction.
The step 44 deeper than the height of the roller linear bear link 4
3, and is formed as an inclined surface 45 of a predetermined slope on the rear end side of the stepped portion 44 in the sliding direction. When the throttle plate 40 is in the fully closed position, the roller linear bearing link 43 is housed in the stepped portion 44 in correspondence with the stepped portion 44 and the roller linear bearing 43 as shown in FIG. 3(A), and the throttle plate 40 can come into close contact with the cylinder head lO side to obtain good sealing performance, and from this state the throttle plate 4
When the throttle plate 40 slides toward the throttle opening side, the throttle plate 40 rides on the roller linear bear link 43 via its inclined surface 45, and as a result, the cylinder head 1
A roller linear bear link 43 is interposed between the throttle plate 40 and the throttle plate 40, so that the throttle plate 40 can easily slide. In this state, a gap is formed between the throttle plate 40 and the cylinder head 10, but the above-mentioned problems caused by this gap become a problem when the intake air flow rate is extremely low, such as when idling or when loading a light meal. This does not pose a particular problem if the Hartz opening is large.

FIG. 4 shows another embodiment for improving sealing performance,
Around the valve hole 41 of the throttle plate 40 or around the opening 11A of the intake boat 11 of the cylinder head 10 and the opening of the intake passage 21 of the intake manifold 20,
The labyrinth grooves 46, 13 and 23 were formed by excavating.

That is, in FIG. 4(A), labyrinth grooves 46 are formed in double concentric circles around the pulp holes 41 on both sides of the throttle plate 40, and in FIG. Two concentric labyrinths tR13 and tR23 are formed around the opening 11A of the intake bow)-11 and around the opening of the intake passage 21 of the intake manifold 20, respectively.

In addition, in the slide valve as in the above embodiment, the throttle plate 40 is caused by the combustion gas blowing back into the intake boat at the time of overlapping of the intake harts at the end of the exhaust stroke.
Carbon may adhere to the surface, and this adhered carbon may stick between the throttle plate 40, the cylinder head 10, and the intake manifold 20, and prevent the throttle plate 40 from sliding smoothly. To solve this problem, as shown in FIG.
．． This can be prevented by configuring the structure so that the attached carbon is scraped off by 47. That is, FIG. 5<A
) is provided with protrusions 14 and 24 protruding in an annular shape around the opening 11A of the intake boat 11 of the cylinder head 10 and around the opening of the intake passage 21 of the intake manifold 20, which come into contact with the throttle plate 40. There is a
5(B), a protrusion 47 is provided in an annular shape around the valve hole 41 on both sides of the throttle plate 40 so as to come into contact with the cylinder head 10 and the intake manifold 20. As shown in FIG.

[Effects of the Invention] As described above, according to the engine intake system according to the present invention, since the intake manifold and the cylinder head constitute the Harz body, the separate Harz body is connected to the intake manifold and the engine body (cylinder head). ) or between the intake manifold that is divided into two parts in the direction in which the intake passage extends, resulting in an extremely compact structure.In addition, the intake manifold and cylinder head are assembled as one part, making assembly work easier. In addition, maintenance and serviceability are also improved.

Furthermore, since the throttle valve is placed very close to the intake boat, the amount of combustion gas blown back to the intake manifold can be minimized when the intake valves overlap at the end of the exhaust process.

[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 is a cross-sectional view of the cylinder head of a type engine, Figure 2 is a cross-sectional view taken along line II-II in Figure 1, and Figure 3 shows the seal structure. A) is fully closed, and (B) is open from fully closed. Figure 4 (A) and (B) are diagrams showing other embodiments of the seal structure; Figures 5 (A) and (B) are diagrams showing the throttle plate sliding to the side; Figures 5 (A) and (B) prevent the throttle plate from sticking due to carbon. FIG. 3 is a diagram showing the configuration. 10... Cylinder head (engine body) 20... Intake manifold (intake manifold) 40... Throttle plate 41... Harz hole (opening corresponding to the intake pipe)

Claims (1)

[Claims] A throttle plate having an opening corresponding to the intake pipe is slidably interposed between an intake manifold in which a plurality of intake pipes are integrated into each unit cylinder row, and an engine body to which the intake manifold is installed. An engine intake system characterized by comprising: