JP2887599B2 - Intake control valve device for multi-cylinder engine - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an opening / closing control device for a throttle valve and other intake control valves suitable as an automobile engine having a large number of cylinders, and more particularly, to an intake control valve. The present invention relates to an improvement of a device using a slide type plate valve.

[Conventional technology]

Conventionally, providing a slide-type plate valve as an engine throttle valve belongs to a well-known technique particularly in a carburetor of a motorcycle engine (for example, Japanese Utility Model Laid-Open No. 49-46126,
JP-A-51-76226 or JP-A-59-159743.

[Problems to be solved by the invention]

Since the slide-type plate valve does not leave any obstacles such as the valve shaft in the intake passage when fully opened, it is often used in competition engines that require high power, regardless of whether it is a two-wheel or four-wheel engine. If a configuration using individual plate valves is adopted, the outer shape including the actuator is large, and adjacent components interfere with each other.

On the other hand, in order to avoid this, in a racing car, the plate valve is slid in a direction parallel to the crankshaft, but it is difficult to equalize the intake air amount for each cylinder.

[Means for solving the problem]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problem, and provides an intake control valve device capable of minimizing the outer shape of a plate valve as much as possible and having a uniform intake amount for each cylinder. With the goal.

In order to achieve this object, an intake control valve device for a multi-cylinder engine according to the present invention opens intake ports of a plurality of cylinders arranged in parallel to a cylinder head, and sets an intake flow rate for each intake path connected to the intake port. Provide a slide-type plate valve for controlling
In the arrangement in which the reciprocating direction of the plate valve is substantially parallel to the axis of the cylinder, a reciprocating mechanism which engages with the plate valve and reciprocates it into the intake passage is disposed on the retreat side of the control valve, and for each cylinder. Are connected to each other by a connecting shaft extending in the direction in which the cylinders are arranged, and a connecting mechanism for synchronizing plate valves is interposed at a portion of the connecting shaft between the moving mechanisms of the cylinders.

[Action]

The slide type plate valve moves back and forth in the cylinder arrangement direction. The reciprocating mechanism, which is an actuator, is provided on the retreat side of the plate valve, adjacent to the retreat space of the plate valve, using the dead space. Further, a connecting mechanism for synchronizing the plate valves can be accommodated in a dead space formed between the advancing and retreating mechanisms.

〔Example〕

Hereinafter, the present invention will be described with reference to the illustrated embodiment.
In the figure, reference numeral 1 denotes a four-cylinder four-stroke engine, and a cylinder 1a,
It has a combustion chamber 1d defined by a cylinder head 1b and a piston 1c. An intake passage 2 is connected to each combustion chamber 1d constituting the cylinder. The intake passage 2 is formed as a series of passages that communicate with the atmosphere through a cylinder head 1b and an intake pipe 3 connected to the cylinder head 1b, in substantially the same manner as in the prior art.

The intake passage 2 according to the present invention includes a relatively long service intake passage 2a that operates over the entire range from a low load operation range to a high load operation range, and a relatively short high load intake passage 2b that is branched from the middle. , A so-called two-system intake passage. 2c is an idle speed control valve bypassing the throttle valve 5, and 2d is a fuel injection nozzle. Reference numeral 4 denotes an air cleaner box provided at the upstream end of each intake path. F is a fire wall that partitions the engine room and the vehicle room.

Reference numeral 5 denotes a throttle valve provided in the service intake passage 2a close to the cylinder head 1b, and reference numeral 6 denotes a control valve for opening and closing the high load air passage 2b. Each of them has almost the same configuration consisting of a slide type plate valve. Hereinafter, only the configuration of the control valve 6 will be described, and the throttle valve 5 will be denoted by the corresponding reference numerals and detailed description thereof will be omitted.

The control valve 6 is a plate-shaped valve element 6a which moves in the axial direction of the cylinder, that is, in the vertical direction in FIG. 1 (5a in the case of a throttle valve).
And a valve box 6a (5b) for supporting and guiding it. In this example, the valve 6a moves downward to
From the vehicle into the valve box 6b, move upward and advance into the intake path 2b. The valve box 6b has a relatively flat half A extending over four intake passages 2b and a grooved half B for each intake passage forming a guide hole 6c (5c) of the valve body 6a. It is screwed together and integrated. A guide hole 6c having a rectangular cross section through which the intake passage 2b and the valve element 6a advance and retreat is formed therein.

In the guide hole 6c, the intake passage 2b is located on the upstream side of the valve body 6a.
An annular seal member 6d (5d) for sealing between the valve element 6a and the valve box 6b is provided around the valve body 6a. That is, the surface of the valve element 6a on the intake upstream side is in sliding contact with the annular sealing member 6d, and the surface on the downstream side is directly supported by the sliding surface formed on the valve box 6b. In this example, the seal member 6d is a lip seal having a seal lip on the sliding surface side, and good sealing can be achieved by a relatively weak contact pressure. In addition, the sealing member 6d is
The valve body 6a may be provided instead of the valve body 6a. However, by providing the valve body 6a on the intake path side adjacent to the later-described advance / retreat mechanism 7, the appearance can be reduced, and the weight of the valve body 6a can be reduced. 7h is an O-ring for sealing the inside and outside of the valve box.

Therefore, during operation of the engine, the valve
6a is pressed against the flat half A side and the other side is a sealing member
Since the seal is provided by the seal 6d, even if there is a slight gap between the guide hole 6c and the valve body 6a, the leakage of the intake air due to the slight gap is small. That is, the amount of intake air flowing by-passing the valve element 6a can be reduced. Further, if the leakage is reduced, the clearance between the guide hole 6c and the valve element 6a can be set relatively large, so that a smooth operation can be performed.

Reference numeral 7 denotes an advance / retreat mechanism for opening and closing the control valve 6. The reciprocating mechanism 7 is on the retreating side of the control valve 6, in this example, the intake path.
2b, the main part of which is connected to the connecting shaft
The free end is supported by 7a and includes a rotating arm 7c rotatably connected to the valve 6a via a pin 7b. Therefore, the valve body
6a is an intake passage accompanying the rotation of the connecting shaft 7a to the left and right.
Advance into or out of 2b. The connection shaft 7a is connected to that of the adjacent cylinder via a joint 7d.
The joint 7d is a well-known valve shaft connecting joint configured to be able to slightly adjust the phase of the adjacent connecting shaft 7a in order to match the phases of the adjacent connecting shafts 7a. That is, the joint 7d is interposed at a position between the forward / backward mechanisms 7 of the cylinders on the connection shaft 7a. 7e
Is a pulley provided on the outermost connecting shaft 7a, and a throttle wire 7f wound therearound is connected to an accelerator pedal (not shown).

Next, the operation of the engine of the embodiment will be described. When the engine is idling, the throttle valve 5 and the control valve 6
Are fully closed, and the intake air is exclusively supplied via the idle control valve 2c, and the opening degree of the control valve 2c is changed to set the idle speed. When the throttle valve 5 is opened to increase the engine output, intake air flows in through the service intake passage 2a, and predetermined fuel is supplied from the fuel injection nozzle 2d. When large output is required temporarily, such as when overtaking or accelerating a vehicle,
If the throttle valve 5 is opened further, the control valve 6 is also opened accordingly, and the normal intake passage 2a operates efficiently in the low speed region, and the high load intake passage 2b operates efficiently in the high speed region to supply a large amount of intake air.

The throttle valve 5 and the control valve 6 that operate as described above receive a strong intake pressure difference between the front and back, but a seal member 6d is interposed between the valve body 6a and the valve box 6b, and the clearance between them is provided. Can be set large so that the opening and closing operation is performed smoothly.

Further, since the reciprocating mechanism 7 for operating the valve element 6a is adjacent to the seal member 6d below the intake path 2a and is disposed on the side of the valve element 6a, they are collectively disposed and the structure is small. Is becoming Further, since the joint 7d for tuning the valve can be accommodated in a dead space formed between the reciprocating mechanisms 7, a plate-valve intake control valve capable of equalizing the intake amount for each cylinder. The device can be made compact.

〔The invention's effect〕

As described above, according to the present invention, a reciprocating mechanism that engages with a plate valve and moves it into and out of the intake passage is disposed on the retreat side of the control valve, and a reciprocating mechanism for each cylinder extends in the cylinder arrangement direction. By connecting with each other, a portion between the advancing and retreating mechanism of each cylinder in the connecting shaft, a connecting mechanism for plate valve tuning is interposed, so that the size in the cylinder arrangement direction, that is, the width can be formed narrow, There is an effect that a slide type on-off valve can be adopted without any trouble in a multi-cylinder engine. In addition, since a coupling mechanism for synchronizing plate valves can be accommodated in a dead space formed between the reciprocating mechanisms, a plate valve type intake control valve device capable of equalizing the amount of intake air for each cylinder. Can be formed compactly.

[Brief description of the drawings]

The drawings show an embodiment of the present invention. FIG. 1 is a sectional view of an engine, FIG. 2 is a side view showing a part of the engine in an enlarged manner, FIG. 3 is a sectional view of the same, and FIG. IV-IV sectional view, FIG. 5 is an enlarged sectional view taken along the line VV in FIG. 1, FIG. 6 is a sectional view taken along the line VI-VI, FIG. 7 is a front view of half A, FIG. 7 is an inner view of the half part B. FIG. 5 throttle valve, 6 control valve, 6a valve body, 6b valve box, 7 reciprocating mechanism, 7a connecting shaft.

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F02D 9/02 361 F02D 9/14

Claims (2)

(57) [Claims] An intake port of a plurality of cylinders arranged side by side is opened to a cylinder head, and a slide type plate valve for controlling an intake flow rate is provided for each intake path connected to the intake port. In an arrangement in which the direction is substantially parallel to the axis of the cylinder, an advance / retreat mechanism that engages with the plate valve and advances / retreats it into the intake passage is arranged on the retreat side of the control valve, and the advance / retreat mechanism for each cylinder is a A multi-cylinder engine characterized in that a connecting mechanism for synchronizing plate valves is interposed at a portion between the advancing and retreating mechanisms of the cylinders on the connecting shaft. Intake control valve device. The slide type plate valve comprises a valve body slidably fitted to a valve box, and an annular seal member surrounding an intake passage is provided between the valve box and the valve body on the upstream side of intake air. 2. An intake control valve device for a multi-cylinder engine according to claim 1, wherein