JPH09280064A - Internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inexpensive device which can control a swirl control valve in correspondence to number of revolutions of an engine. SOLUTION: A guide lever 14 is provided on a shaft 12 which opens and closes a swirl control valve 11, and the guide lever 14 is brought into contact with a hydraulic piston 16 which comes out and in due to hydraulic pressure generated by an hydraulic pump. When an engine rotates at high speed, the hydraulic piston 16 pushes the guide lever 14 due to high hydraulic pressure from the hydraulic pump, thereby opening the swirl control valve 11 through the shaft 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an internal combustion engine which can control a swirl control valve well.

[0002]

2. Description of the Related Art Conventionally, as shown in the schematic view of FIG. 4, an intake manifold 2 is connected to a cylinder head 1, and a throttle chamber 3 is provided on the upstream side of the intake manifold 2. An air cleaner 5 is provided on the upstream side, a throttle valve 4 is provided in the throttle chamber 3, and a solenoid 8 is connected to the air cleaner 5 via a passage 6. A negative pressure passage 7 is formed from the downstream side of the throttle valve 4 to the solenoid 8 via a check valve P. The solenoid 8 is connected to a control unit 9 and
An actuator 10 is connected, and the actuator 10 is connected to a swirl control valve 11 provided in the intake passage of the intake manifold 2. In such a conventional structure, the control unit 9 controls on / off of the solenoid 8, and the solenoid 8 is configured to control the negative pressure acting on the actuator 10 in two stages of fully closed and fully opened. When the negative pressure introduced through the negative pressure passage 7 acts on the actuator 10, the swirl control valve 11 is closed. In such a conventional structure, the solenoid 8 and the actuator 10 are provided only for controlling the opening / closing of the swirl control valve 11, and the passages 6 and 7 need to be formed, which complicates the piping and wiring. However, there is a problem that it becomes complicated and becomes an expensive device.

[0003]

The present invention has been devised in view of the above-mentioned problems of the prior art, and provides an internal combustion engine capable of satisfactorily controlling a swirl control valve with an inexpensive structure without using a solenoid or an actuator. The first gist of the present invention is to provide a swirl control valve capable of generating a swirl flow (swirl) in a combustion chamber in an intake passage.
A shaft that opens and closes the swirl control valve is connected to a hydraulic piston that is operated by the oil pressure generated by an oil pump, the swirl control valve is closed when the engine is running at low speed, and a high hydraulic pressure from the oil pump is running when the engine is running at high speed. The hydraulic piston rotates the shaft so that the swirl control valve is opened. The second gist is that a guide lever is provided on the shaft, and the guide lever is brought into contact with a hydraulic piston that moves in and out by a hydraulic pressure generated by an oil pump, so that the high hydraulic pressure from the oil pump causes a high rotation of the engine. The hydraulic piston pushes the guide lever so that the swirl control valve is opened.

[0004]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an enlarged cross-sectional configuration diagram of a main part around a swirl control valve, and FIG. 2 is a view taken in the direction of arrow A in FIG. Note that FIG. 3 is a schematic configuration diagram showing the overall configuration. Referring first to the overall view of FIG. 3, an intake manifold 2 forming an intake passage R is connected to the cylinder head 1, and a throttle chamber 3 is provided on the upstream side of the intake manifold 2 and further upstream thereof. Is provided with an air cleaner 5. An oil pump 19 rotated by an engine is provided at a lower portion of the cylinder block 18 below the cylinder head 1. The oil delivered by the oil pump 19 passes through an oil filter 20 and an oil gallery 17. And is supplied to a hydraulic piston 16 fixed to the cylinder head 1.

As shown in FIG. 1, the hydraulic piston 16
Is configured to be retracted and retracted in a housing 15 fixed to the cylinder head 1. In this example, a guide lever 14 is arranged in abutting manner on the outer end side of the hydraulic piston 16. The guide lever 14 is attached to the shaft 12 of the swirl control valve 11, and the guide lever 14 is always urged toward the hydraulic piston 16 by the urging force of the spring 13 provided on the shaft 12. It has been done. The swirl control valve 11 that is opened and closed by the rotation of the shaft 12 is provided in the intake passage R of the intake manifold 2.
The swirl control valve 11 according to the present embodiment is openable and closable inside, and has a notch 11a formed in an upper portion thereof.

In such a structure, since the rotation speed of the oil pump 19 is low when the engine speed is low, the oil pressure generated in the oil pump 19 does not rise. Therefore, the oil gallery 17 supplies the oil to the hydraulic piston 16. Since the hydraulic pressure generated is also low, the hydraulic piston 16 does not project outwardly, and therefore the guide lever 14 is maintained in the closed direction by the urging force of the spring 13, at which time the swirl control valve 11 intakes. The passage R is in a closed state, and in this closed state, the vertical swirl is strengthened via the notch 11a formed in the swirl control valve 11.

On the other hand, as the engine speed increases, the rotation speed of the oil pump 19 also increases, which raises the hydraulic pressure and causes the hydraulic piston 16 to move to the housing 15.
The guide lever 14 is pushed outward, and when the guide lever 14 is pushed outward, the shaft 12 rotates and the swirl control valve 11 rotates in the opening direction. To be done. Therefore, at high engine speed, the swirl control valve 11 is opened, and the intake resistance of the intake passage R is reduced.

As described above, in this embodiment, the hydraulic piston 16 can be operated by using the hydraulic pressure generated by the oil pump 19, and the swirl control valve 11 can be opened and closed by the operation of the hydraulic piston 16. , No need for solenoids or actuators to control swirl control valve as in the past, and no piping or wiring for it, so swirl control valve 11 is good by using only hydraulic pressure that rises linearly with engine rotation. Therefore, an inexpensive device can be configured.

[0009]

INDUSTRIAL APPLICABILITY The present invention is an internal combustion engine in which a swirl control valve capable of generating a swirl flow (swirl) in a combustion chamber is provided in an intake passage, and a shaft for opening and closing the swirl control valve,
The hydraulic piston operated by the hydraulic pressure generated by the oil pump is connected, the swirl control valve is closed when the engine is rotating at a low speed, and the hydraulic piston rotates the shaft by the high hydraulic pressure from the oil pump when the engine is rotating at a high speed. Since the swirl control valve is configured to be opened, the conventional solenoid and actuator are not required, complicated piping and wiring are not required, and a hydraulic piston can be installed to make it an inexpensive configuration, and the engine rotation Thus, the swirl control valve can be satisfactorily controlled only by the hydraulic pressure from the oil pump that rises linearly, which has the effect of making the entire device inexpensive.

Further, a guide lever is provided on the shaft, and the guide lever is brought into contact with a hydraulic piston that moves in and out by a hydraulic pressure generated by an oil pump, and the hydraulic piston is driven by the high hydraulic pressure from the oil pump when the engine rotates at a high speed. Is configured to push the guide lever to open the swirl control valve, the high hydraulic pressure is supplied from the oil pump when the engine is rotating at a high speed, and the hydraulic piston is projected, so that the guide lever is pushed well. Since the swirl control valve is opened, the swirl control valve can be controlled according to the engine speed with an inexpensive structure.

[Brief description of drawings]

FIG. 1 is an enlarged cross-sectional configuration diagram of essential parts around a swirl control valve.

FIG. 2 is a view taken in the direction of arrow A in FIG. 1;

FIG. 3 is a schematic diagram showing an overall configuration.

FIG. 4 is a schematic configuration diagram of a conventional structure.

[Explanation of symbols]

 1 Cylinder Head 2 Intake Manifold 11 Swirl Control Valve 12 Shaft 13 Spring 14 Guide Lever 15 Housing 16 Hydraulic Piston 17 Oil Gallery 19 Oil Pump R Intake Passage

Claims (2)

[Claims] 1. In an internal combustion engine in which a swirl control valve capable of generating a swirl flow (swirl) in a combustion chamber is provided in an intake passage, a hydraulic pressure generated by an oil pump is provided on a shaft for opening and closing the swirl control valve. When the engine is running at a low speed, the swirl control valve is closed, and when the engine is running at a high speed, high hydraulic pressure from the oil pump causes the hydraulic piston to rotate the shaft to open the swirl control valve. An internal combustion engine having the above structure. 2. A guide lever is provided on the shaft, the guide lever is brought into contact with a hydraulic piston that moves in and out by a hydraulic pressure generated by an oil pump, and the hydraulic piston is driven by a high hydraulic pressure from the oil pump when the engine rotates at a high speed. The internal combustion engine according to claim 1, wherein is configured so that the guide lever is pushed to open the swirl control valve.