JPH08232667A - Device for changing the length of the air intake line of an internal combustion engine - Google Patents

Abstract

(57) 【Abstract】 PROBLEM TO BE SOLVED: To achieve a compact structure volume, without causing the intake pipe portion to be disconnected and not to work.
Provided is a device capable of changing the length of an intake line of an internal combustion engine. There is an intake device (3) having a longitudinal slider that is displaceable in the longitudinal direction (L) inside a collective housing (7). In the first position (S1), the effective intake line length for each cylinder is determined by the intake pipe (5) and the collective volume (19) of each cylinder.
And the cylinder is formed from individual tube lines (8). Adjacent intake lines are connected to the slide board (1
They are separated from each other by the part (18) closed by 1). In the second position, these parts (18) develop vibrations of the intake pipe exclusively in the pipe line (8). then,
Each of these pipe lines covers the entire collecting volume (6) present in the collecting housing (7) as well as all intake pipes.
It is connected to (5).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for changing the length of an air intake line of an internal combustion engine, which device has at least one collecting volume part having an inflow opening for fresh air. From the part, the individual cylinder line is connected to the cylinder of the internal combustion engine and also has a slide means which is adjustable depending on the rotational speed in order to change the effective intake line length.

[0002]

It is known to use longitudinally controllable intake pipes in internal combustion engines to achieve improved torque behavior with respect to the speed range of the internal combustion engine compared to conventional intake pipes. . For example, from EP 03 82 596 B1 an air intake device for internal combustion engines is known, in which each cylinder is provided with a short intake pipe that can be shut off as well as a long intake pipe that is permanently opened. It is attached. In a certain speed range, the inflow takes place exclusively via the long intake pipe, the short blocked intake pipe being ineffective and inoperative.

From German Patent Specification No. 9 57 802 which forms a device of the kind mentioned at the outset, an inlet for fresh air is provided in order to adapt the length of the intake line to the speed of the internal combustion engine. It is known to provide sliding means in the form of a swivel roller for changing the effective intake line length, in the collective volume in which the individual cylinder lines of the cylinders are connected to the cylinders of the internal combustion engine. ing. In this case, at the adjustment position of the shortest intake line length, most of the housings for accommodating the rollers are disconnected and the effect is lost.

[0004]

SUMMARY OF THE INVENTION The object of the present invention is to achieve the advantages of compact construction volume and weight without the fact that the parts of the intake pipe are disconnected and ineffective.
It is an object of the present invention to provide a device that achieves a change in the length of the intake line.

[0005]

The above-mentioned problem is solved by claim 1.
It is solved by the characteristics of. Advantageous configurations are described in the dependent claims. A feature of the present invention is that, in addition to the individual cylinder line of the cylinder, individual individual cylinder intake pipes, each of which is provided with an inlet, are arranged, and these intake pipes supply fresh air to the collecting volume. To be connected. In this collecting volume, an axial sliding means is arranged which is displaceable in the longitudinal direction of the collecting volume from a first position to a second position, in which case at the first position the effective of each individual cylinder is effective. The intake line length is formed from the sum of the intake pipe and the length of the pipe line, where adjacent intake lines are separated by a partition wall of the sliding means in the collecting volume, and in the second position, each pipe line is It is connected to the entire collecting volume and all intake pipes.

Advantageously, in both positions of the sliding means as well, each intake pipe, the collecting volume as well as each pipe line participates in the air supply. In the first position, the separation of adjacent intake line lengths for a relatively low speed range frees the intake pipe lengths of the individual cylinders of a relatively long length for sufficient torque behavior, whereas In the second position, exclusively pipe lines leading from the collecting volume to the cylinder are connected in a vibrating manner meaningfully. In that case, each cylinder can be operated from the entire collecting volume or from the previously connected intake pipe because of the position of the sliding means.

In an advantageous configuration, it is possible to achieve a further reduction of the structural volume by means of a slider in the form of a central connecting rod on which a slide plate is arranged. In that case, an air pressure adjusting unit arranged on the end side of the collecting housing that houses the collecting volume realizes an axial displacement from one position to the other depending on the load and / or the rotational speed.

In order to prevent the vibrations that may occur in the slide, in an alternative variant of the central connecting rod, a large number of such rods can be arranged in the outer edge region of the slide. In the arrangement with the connecting rods flush with the slider wall, they can provide radial guidance of the slider in the collective housing.
In the case of a large number of connecting rods, preferably three connecting rods, these can be arranged in the collective housing so as not to obstruct the air flow.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below with reference to the embodiments shown in the drawings. An internal combustion engine 1 having a cylinder head 2 has a suction device for supplying the combustion air, which is shown by 3 as a whole. The individual intake pipes 5 of the cylinders, each provided with one inlet 4, open into a collective housing 7 which houses a collective volume 6, which substantially extends along the internal combustion engine 1. It extends in the direction L.

A pipe line 8 for each cylinder is connected to the collective housing 7 following the intake pipe 5, and this pipe line corresponds to the inlet passage (not shown) of the cylinder head 2. The collecting housing 7 has a sliding means 9 which is substantially circular in cross section in the longitudinal direction L and is designed as a longitudinal slider. The longitudinal slider is substantially formed by a connecting rod 10 extending in the longitudinal direction L and a slide plate 11 and a working member 12 which are fixed to this connecting rod and are formed as partition walls. The reference numeral 12 is arranged in a protruding portion 13 on the end side of the collective housing 7.

The acting member 12 is formed by an air pressure chamber 14 formed in the protruding portion 13 and a negative pressure connecting portion 17,
The pneumatic chamber 14 has a piston 15 acting on the connecting rod 13.
And a spring 16 extending between the piston and the housing wall on the end side. Due to the first speed range of the internal combustion engine, the longitudinal slider is spring loaded in the first position S1 in FIG.

The effective suction line length for each cylinder is formed by the length of each intake pipe 5 and pipe line 8. This is because adjacent suction lines are separated from each other by the slide plate 11 contacting the cylindrical portion 18 of the collective housing 7. Therefore, combustion air is supplied to each cylinder through the supply port 4, the intake pipe 5, the collective partial volume portion 19 formed between the adjacent slide plates 11, and the pipe line 8.

In the further following rotational speed range of the internal combustion engine 1, the longitudinal slider has a negative pressure corresponding to the corresponding connecting portion 17.
Is moved from the first position to the second position S2, by which the position S2 is ensured by abutting the pot-shaped piston 15 against the end-side wall of the projection 13. The vibration of the intake pipes no longer develops only in the pipe lines 8 which represent the effective suction line length, these pipe lines now being connected through the open part 18 with the entire collecting volume 6 as well as all the intake pipes 5, respectively. There is.

In the area in which the piston 15 abuts the wall receiving the negative pressure connection 17, an elastic seal can be arranged so that the throttle valve is wide open and thus a slight or small intake pipe negative pressure. When the internal combustion engine 1 is operated for a relatively long time at, the leakage loss is avoided and the second position S
2 is stabilized. Depending on the number of cylinders of the internal combustion engine and the geometrical dimensions of the collective housing 7, it is advantageous to provide a larger number of connecting rods 10 according to FIGS. 5 and 6 in order to prevent vibrations of the slide plate 11 and the connecting rods 10. In that case, these connecting rods are advantageously arranged in the outer edge region of the slide plate 11 and are formed flush with the outer peripheral edge of the slide plate according to FIG. Reserved.

Depending on the angle at which the intake pipe 5 or the pipe line 8 is connected to the collecting housing 7, the connecting rod 10 can be arranged according to FIG. 5 so that it is not directly in the air flow.

[0016]

As described above, according to the device of the present invention, while achieving the advantages of compact structure volume and weight, the intake pipe portion is not disconnected and the effect is not lost, and the intake line is not affected. A change in length can be achieved.

[Brief description of drawings]

1 is a side view of a device according to the invention. FIG.

FIG. 2 is a plan view, partially broken away, showing the device with the sliding means in the first position.

FIG. 3 is a plan view, partially broken away, showing the device with the sliding means in the second position.

4 is a cross-sectional view taken along the line IV-IV in FIG.

5 is a cross-sectional view similar to FIG. 4 of a modified example.

FIG. 6 is a sectional view similar to FIG. 4 of another modified example.

[Explanation of symbols]

 4 Air Inlet 5 Intake Pipe 6 Collecting Volume 7 Collecting Housing 8 Pipe Line 9 Slide Means 10 Connecting Rod 11 Slide Board 12 Actuating Member 15 Piston 16 Spring 18 Hollow Cylindrical Part S1 First Position S2 Second Position L Longitudinal direction

Claims (10)

[Claims] 1. A device for varying the length of an air intake line of an internal combustion engine, comprising at least one collecting volume having an inlet opening for fresh air, from which collecting cylinder an individual tube is provided. In a device whose line is connected to a cylinder of an internal combustion engine and which has a sliding means which is adjustable depending on the rotational speed in order to change the effective intake line length, cylinders each provided with an inlet (4) It has an individual intake pipe (5), which is connected to the collecting volume (6) to supply fresh air, and which is in the first position (S1).
From the second position (S2) to the longitudinal direction (L) of the collecting volume (6) is provided with an axial sliding means (9), which in the first position (S1), The effective intake line length for each cylinder, which is derived from the sum of the lengths of the intake pipe (5) and the pipe line (8), is adjusted so that adjacent intake lines are separated by the partition wall of the sliding means (9). Placed
In the second position (S2), each pipe line (8) is connected to the entire collecting volume (6) and all the intake pipes (5). 2. A collecting housing (7) arranged substantially in the longitudinal direction (L) and containing a collecting volume (6),
The device according to claim 1, characterized in that an intake pipe (5) and a pipe line (8) are connected to the collective housing so as to extend in a plane transverse to the longitudinal direction (L). 3. The hollow cylindrical part (18) of the collective housing (7) arranged between adjacent intake lines is located at the first position (S).
Device according to claim 2, characterized in that in 1) it is closed by a partition wall. 4. Sliding means (9) substantially in the longitudinal direction.
The at least one connecting rod (10) displaceable to the (L) by the action member (12) and the partition wall arranged on the connecting rod are formed.
The device according to any one of the above. 5. Device according to claim 4, characterized in that it comprises only one connecting rod (10) extending through the center of the collecting housing (7). 6. Device according to claim 4, characterized in that it comprises at least three connecting rods (10) arranged in the outer edge region of the partition wall. 7. Device according to claim 6, characterized in that the connecting rod (10) is arranged flush with the outer peripheral surface of the partition wall. 8. The acting member (12) is a slide housing (7).
7. The device according to claim 5, wherein the device is held and arranged on the end side of the. 9. The working member (12) is formed as an air pressure adjusting unit, which comprises a piston (15) acting on the connecting rod (10) and between the slide housing (7) and the piston (15). 9. Device according to claim 8, characterized in that it comprises a spring (16) which is supported by the spring and which pre-biases the sliding means (9) to the first position (S1). 10. Device according to claim 1, characterized in that the partition wall is formed as a circular slide plate (11).