JP2002317637A - Variable intake device for engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately control intake in correspondence with operation condition of an engine in a variable intake device for engine wherein a selector valve for switching between a communicated condition and a closed condition with respect to an intake collection chamber in a halfway of plural main intake passages is provided in an intake manifold. SOLUTION: An insertion hole 26 is provided in the intake manifold M in order to open plural first and second exit side sub intake passages 22 and 23 which are opened in the halfway of the main intake passage 18 respectively, and plural entrance side sub-intake passages 24 opened to the intake collection chamber 16. The selector valve 11A selectively switches among a condition of closing an opening part of the entrance side sub intake passage 24 to the insertion hole 26, a condition of communicating the first exit side sub intake passage 22 with the entrance side sub intake passage 24 and closing an opening part of the second exit side sub-intake passage 23 to the insertion hole 26, and a condition of closing an opening part of the first exit side sub intake passage 22 to the insertion hole 26 and communicating the entrance side sub- intake passage 24 with the second exit side sub intake passage 23.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intake manifold having an intake chamber into which air is introduced, and a plurality of main intake passages having one end commonly connected to the intake chamber and the other end connected to an engine. The present invention relates to a variable intake device for an engine in which a manifold is provided with a switching valve capable of switching between communication and shutoff of the intake air collection chamber in the middle of each main intake passage.

[0002]

2. Description of the Related Art Conventionally, such a variable intake device for an engine has been already disclosed in, for example, U.S. Pat. No. 4,932,369, Japanese Patent Application Laid-Open No. 8-500411, Japanese Unexamined Patent Application Publication Nos. Are known. In these variable intake devices for engines, a plurality of sub-intake passages each having one end opened to the intake collection chamber and the other end being opened in the middle of a plurality of main intake passages connected to the engine are individually provided for each main intake passage. The auxiliary intake passages are formed one by one in order to shut off each sub-intake passage by the switching valve when the engine is running at a low speed, and to open each sub-intake passage by the switching valve when the engine is running at a high speed. .

[0003]

According to the above-mentioned conventional variable intake system for an engine, the intake passage length is changed in two stages during low-speed operation and high-speed operation of the engine. In order to perform more precise intake control according to the above, it is desirable to change the intake passage length in more steps. Moreover, it is desirable to avoid a large intake manifold when more precise intake control is possible.

The present invention has been made in view of the above circumstances, and a variable intake device for an engine capable of performing precise intake control according to the operating state of the engine while avoiding an increase in the size of the intake manifold. The purpose is to provide.

[0005]

In order to achieve the above-mentioned object, the present invention provides an intake air collection chamber into which air is introduced, and one end commonly connected to the intake air collection chamber and the other end connected to an engine. An intake manifold having a plurality of main intake passages arranged in parallel with each other, a variable intake device for an engine provided with a switching valve capable of switching between communication and shutoff of the intake collecting chamber in the middle of each main intake passage. A plurality of first outlet-side sub-intake passages each opening in the middle of the main intake passage; and a plurality of second outlet-portions each opening in the middle of each main intake passage closer to the engine than each first outlet-side sub-intake passage.
An outlet-side sub-intake passage, an inlet-side sub-intake passage opening to the intake collecting chamber, and a first outlet-side sub-intake passage, a second outlet-side sub-intake passage, and an inlet-side sub-intake passage. An insertion hole opened at a position where the intervals are substantially equal is provided in the intake manifold, and the switching valve is provided at a rotational position for closing an opening of the inlet-side auxiliary intake passage to the insertion hole, a second outlet-side auxiliary passage. A rotation position for closing the opening of the intake passage to the insertion hole and communicating between the first outlet side sub-intake passage and the inlet side sub-intake passage, and an opening of the first outlet side sub-intake passage to the insertion hole. And a drum type valve body which is capable of switching a rotation position for communicating between the second outlet side auxiliary intake passage and the inlet side auxiliary intake passage and is rotatably fitted to the insertion hole. It is characterized by.

According to such a configuration, a state in which the flow of air from the inlet side auxiliary intake passage to the main intake passage is cut off,
A state in which the inlet side auxiliary intake passage and the first outlet side auxiliary intake passage are communicated with each other and the inlet side auxiliary intake passage and the second outlet side auxiliary intake passage are shut off, and the inlet side auxiliary intake passage and the first outlet side auxiliary intake passage By selectively switching between a state in which the air passage is shut off and a state in which the inlet side auxiliary intake passage and the second outlet side auxiliary intake passage are communicated with each other, the intake passage length can be changed in three stages according to the operating state of the engine. As a result, it is possible to perform more precise intake control according to the operating state of the engine, as compared with a conventional configuration in which the intake passage length is changed in two stages. In addition, the rotation operation of one valve body changes the intake passage length in three stages, thereby simplifying the configuration of the switching valve and improving the responsiveness and the operation reliability. Moreover, in contrast to the conventional variable intake system using a switching valve having a drum type valve element, an outlet side auxiliary intake path individually corresponding to the main intake path is newly formed in the intake manifold, and the valve element Only the structure is changed, and the intake manifold does not become large.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described based on embodiments of the present invention shown in the accompanying drawings.

FIGS. 1 to 5 show a first embodiment of the present invention. FIG. 1 is a longitudinal sectional view of a variable intake device when the engine is operated at a low speed, and FIG. 2 is a sectional view taken along line 2-2 of FIG. 3, FIG. 3 is a perspective view of the valve body, FIG. 4 is a longitudinal sectional view of the variable intake device at the time of medium speed operation of the engine, and FIG. 5 is a longitudinal sectional view of the variable intake device at the time of high speed operation of the engine.

First, in FIGS. 1 and 2, this variable intake device corresponds to, for example, a four-cylinder engine E, and is provided with a switching valve 11A in an intake manifold M.

The intake manifold M is made of first, second and third outer shell members 12, 1 made of synthetic resin which are welded to each other.
3, 14 and a plurality of, for example, four intake pipe portions 15a, 15
a and an insertion member 15 welded to the second outer shell member 13 integrally with the first outer shell member 12 and the first and second outer shell members 12,
13 having one end connected to the intake air collecting chamber 16
Are formed by first, second and third outer shell members 12, 13, 14, respectively, forming four main intake passages 18, 18,. 13, an engine mounting flange 2 formed integrally with
Are connected in common to the other ends of the branch pipes 19, 19,..., And the insertion member 15 is welded to the second outer shell member 13 so as to be housed in the surge tank 17.

An air inlet 21 is provided at one end of the surge tank 17 along the direction in which the branch pipes 19 are arranged in parallel, and an air cleaner is connected to the air inlet 21 via a throttle body (not shown). Then, an amount of air corresponding to the throttle opening of the throttle body is introduced into the intake collecting chamber 16.

Each of the branch pipes 19 having one end connected to the lower part of the surge tank 17 is formed so as to be bent in a substantially C shape and is arranged in parallel in the horizontal direction.
An engine mounting flange 20 commonly connected to the other ends of the nine tanks 19 is disposed above the surge tank 17.

In the second outer shell member 13 of the intake manifold M, a plurality of first outlet side sub-intake passages 22, each of which is opened in the middle of each of the main intake passages 18, 18,.
There are provided a plurality of second outlet side sub intake passages 23, which are respectively opened in the middle of the main intake passages 18, 18 closer to the engine E than the outlet side sub intake passages 22, 22. Each of the intake pipe portions 15a, 15a,... Provided in the insertion member 15 has an inlet-side auxiliary intake passage 24, 24,.
Respectively.

The second outer shell member 1 of the intake manifold M
3 are provided with insertion holes 26 extending in parallel with the parallel direction of the branch pipes 19, 19,..., The first outlet side sub-intake passages 22,. , 24,..., 24
.. Are opened in the inner surface of the insertion hole 26 at substantially equal intervals.

Referring also to FIG. 3, the switching valve 11A is
A drum-type valve body 27A is rotatably fitted into the insertion hole 26. The valve body 27A includes the first outlet side sub-intake passages 22,. 23
, And a concave portion 29 formed in the outer peripheral portion so as to be able to close any one of the inlet-side sub-intake passages 24.
Are provided correspondingly to the outer periphery of the valve body 27A.
A plurality of annular seal members 3 sandwiching each recess 29 from both sides
Are mounted so as to resiliently contact the inner surface of the insertion hole 26.

As shown in FIGS. 1 and 2, the valve body 27A has a pivoting position in which the opening to the insertion hole 26 of the inlet-side sub-intake passages 24 is closed by the closing portions 28, and a second outlet-side sub-intake passage 24. The opening of the intake passages 23 to the insertion holes 26 is closed by the closing portions 28, and the first outlet side secondary intake passages 22 are formed through the concave portions 29.
4 and a rotation position (position shown in FIG. 4) communicating between the inlet-side sub-intake passages 24 and the opening of the first outlet-side sub-intake passages 22 into the insertion hole 26. A rotation position (see FIG. 5) in which the second outlet-side sub-intake passages 23 and the inlet-side sub-intake passages 24.
(Position indicated by).

The inlet side sub-intake passages 24, the recesses 29, the first outlet side sub-intake passages 22 ...
And the length of the passage from the main intake passage 18 to the engine E is from the intake collecting chamber 16 to the inlet-side sub-intake passage 24.
, The concave portion 29, the second outlet side auxiliary intake passage 23, and the main intake passage 18 to the engine E through the passage length.

Next, the operation of the first embodiment will be described. In the low-speed operation state of the engine E, FIGS.
As shown in the figure, the valve body 27A of the switching valve 11A closes the opening to the insertion hole 26 of the inlet side sub-intake passages 24. It pivots to a position where the flow of air to the passages 18 is interrupted. As a result, the air introduced into the intake collecting chamber 16 is supplied to the engine E via only the main intake passages 18, 18,..., And the length of the intake passage from the intake collecting chamber 16 to the engine E is compared. It will be long.

In the middle-speed operation state of the engine E, as shown in FIG. 4, the valve body 27A of the switching valve 11A has its closing portion 2
8 insert holes 26 in the second outlet side sub intake passages 23.
To the first outlet side secondary intake passage 2
2 and the inlet-side sub-intake passage 24 are rotated to a rotating position where they communicate with each other through the recess 29. As a result, most of the air introduced into the intake collecting chamber 16 is supplied to the inlet side sub-intake passages 24, the concave portions 29, and the first outlet side sub-intake passages 22 ...
Is supplied to the engine E through the main intake passages 18..., And the length of the intake passage from the intake collecting chamber 16 to the engine E is shorter than when the engine E is in the low-speed operation state.

Further, in the high-speed operation state of the engine E, as shown in FIG. 5, the valve body 27A of the switching valve 11A is opened by the closing portions 28 to the insertion holes 26 of the first outlet side auxiliary intake passages 22. And a recess 29 between the second outlet side auxiliary intake passages 23 and the inlet side auxiliary intake passages 24.
Are rotated to a position where they communicate with each other. As a result, most of the air introduced into the intake collecting chamber 16 is supplied to the engine E through the inlet-side sub-intake passages 24, the concave portions 29, the second outlet-side sub-intake passages 23, and the main intake passages 18. That is, the length of the intake passage from the intake collective chamber 16 to the engine E is further reduced as compared with the case where the engine E is in the middle-speed operation state.

As described above, the switching valve 11A shuts off the flow of air from the inlet side auxiliary intake passages 24 to the main intake passages 18, the inlet side auxiliary intake passages 24 and the first outlet side auxiliary intake passages 22. ... and a state in which the space between the inlet-side sub-intake passage 24 and the second outlet-side sub-intake passage 23 is cut off, and the space between the inlet-side sub-intake passage 24 and the first outlet-side sub-intake passage 22. The state of communication between the inlet-side auxiliary intake passages 24 and the second outlet-side auxiliary intake passages 23 is selectively switched to change the intake passage length in three stages according to the operating state of the engine E. In comparison with the conventional one in which the intake passage length is changed in two stages, according to the operating state of the engine E,
More precise intake control can be performed.

The switching valve 11A is connected to the inlet side auxiliary intake passage 2
4 and the first and second outlet side auxiliary intake passages 22 ...
The opening position of the inlet-side sub-intake passages 24 to close the opening to the insertion hole 26 is inserted into the insertion hole 26 provided in the intake manifold M by opening the second outlet-side sub-intake passage 23.
, The opening to the insertion hole 26 is closed and the first outlet side sub-intake passage 22 communicates with the inlet side sub-intake passage 24, and the first outlet side sub-intake passage 2
2 and the opening to the insertion hole 26 is closed.
The outlet side auxiliary intake passage 23 and the inlet side auxiliary intake passage 24.
A drum-type valve body 27A capable of switching the rotational position communicating between them is rotatably fitted. According to such a configuration of the switching valve 11A, one valve body is provided. By changing the intake passage length in three stages by the rotation operation of 27A, while simplifying the configuration of the switching valve 11A,
Responsiveness and operation reliability can be improved.

Further, while the operating state of the engine E changes from the low-speed operating state to the medium-speed operating state to the high-speed operating state, the valve body 27A of the switching valve 11A is rotated counterclockwise from the rotational position shown in FIG. The valve body 27 may be sequentially rotated in the direction.
The switching rotation operation of A can be made smooth.

Further, in contrast to the conventional variable intake device using a switching valve having a drum type valve element, the variable intake device of the present invention has an outlet side individually corresponding to the main intake passages 18, 18,. The auxiliary intake passages, for example, the first outlet side auxiliary intake passages 22 are newly formed in the intake manifold M, and only the structure of the valve body 27A needs to be changed, so that the intake manifold M does not increase in size.

FIG. 6 shows a second embodiment of the present invention, in which parts corresponding to those of the first embodiment are denoted by the same reference numerals.

The drum type valve body 27B constituting the switching valve is provided with concave portions 29 in which substantially arc-shaped closing portions 28 are formed on the outer peripheral portion.
Are provided integrally with each other so as to face the closing portions 28.

According to the second embodiment, the same effects as in the first embodiment can be obtained, and the reinforcing portions 31.
Can increase the strength of the valve body 27B, and by setting the width of the reinforcing portions 31.
An increase in air flow resistance due to the reinforcing portions 31 can be reduced.

FIGS. 7 and 8 show a third embodiment of the present invention, in which parts corresponding to those in the first and second embodiments are denoted by the same reference numerals.

The switching valve 11B 'has a drum type valve 27B' rotatably fitted in the insertion hole 26 of the intake manifold M. The valve 27B 'has a spherical crown shape. A recess 2 in which a closing portion 28 'is formed on the outer periphery
9 'are provided corresponding to the main intake passages 18, respectively, and reinforcing portions 31 connecting between both side surfaces of the concave portions 29' are provided.
Are integrally provided so as to face the closing portions 28 '.

According to the third embodiment, the closing portions 28 '.
The strength of the valve body 27B 'can be further improved by increasing the strength of the second embodiment.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various design changes can be made without departing from the present invention described in the appended claims. It is possible.

[0032]

As described above, according to the first aspect of the present invention, the intake passage length can be changed in three stages according to the operating state of the engine, and the intake passage length can be changed in two stages. Compared to the conventional one, it is possible to perform more precise intake control according to the operating state of the engine. In addition, the rotation operation of one valve body changes the intake passage length in three stages, thereby simplifying the configuration of the switching valve and improving the responsiveness and the operation reliability. In addition, compared to the conventional variable intake system, the outlet side auxiliary intake passage corresponding to each main intake passage is newly formed in the intake manifold, and the structure of the valve body only needs to be changed, resulting in a larger intake manifold. I will not.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a variable intake device at the time of engine low speed operation in a first embodiment.

FIG. 2 is a sectional view taken along line 2-2 of FIG.

FIG. 3 is a perspective view of a valve body.

FIG. 4 is a longitudinal sectional view of the variable intake device at the time of engine middle speed operation.

FIG. 5 is a longitudinal sectional view of the variable intake device at the time of high-speed operation of the engine.

FIG. 6 is a perspective view of a valve body according to a second embodiment.

FIG. 7 is a longitudinal sectional view of the variable intake device at the time of low-speed operation of the engine in the third embodiment.

FIG. 8 is a perspective view of a valve body according to a third embodiment.

[Explanation of symbols]

 11A, 11B, 11B 'switching valve 16 intake manifold 18 main intake passage 22 first outlet side auxiliary intake passage 23 second outlet side auxiliary intake passage 24 · Inlet side auxiliary intake passage 26 ··· Insertion hole 27A, 27B, 27B '··· Valve element E ··· Engine M ··· Intake manifold

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3G031 AA28 AB05 AC01 BA14 BB05 DA12 DA34 DA36 EA02 FA03 GA05 HA01 HA02 HA04 HA10

Claims (1)

[Claims] 1. An intake air collecting chamber (16) into which air is introduced.
And an intake manifold (M) having a plurality of main intake passages (18) having one end commonly connected to the intake collecting chamber (16) and the other end connected to the engine (E) and arranged in parallel with each other. A switching valve (11) capable of switching between communication and blocking of the intake collecting chamber (16) in the middle of each main intake passage (18).
A, 11B, 11B '), a plurality of first outlet side sub intake passages (22) each of which opens in the middle of each of the main intake passages (18).
A plurality of second outlet side auxiliary intake passages (23) each of which opens at a position in the main intake passages (18) closer to the engine (E) than the respective first outlet side auxiliary intake passages (22);
An inlet-side sub-intake passage (24) that opens to the intake collective chamber (16), a first outlet-side sub-intake passage (22), a second outlet-side sub-intake passage (23), and an inlet-side sub-intake passage ( 24) is provided in the intake manifold (M), and the switching valve (11A-11B ') is provided with an insertion hole (26) opened at a position where the distance between the passages (22, 23, 24) is substantially equal to each other. ) Is a rotation position for closing the opening of the inlet side auxiliary intake passage (24) to the insertion hole (26), and the opening of the second outlet side auxiliary intake passage (23) to the insertion hole (26). The rotation position for closing and communicating between the first outlet side auxiliary intake passage (22) and the inlet side auxiliary intake passage (24), and the insertion hole (2) of the first outlet side auxiliary intake passage (22).
The drum type valve body (27A, 27A, 6A) that can close the opening to 6) and switch the rotational position communicating between the second outlet side auxiliary intake passage (23) and the inlet side auxiliary intake passage (24). 27B, 27B ') is rotatably fitted in said insertion hole (26).