JPH0643201U - Intake valve device for internal combustion engine - Google Patents

Abstract

(57) [Summary] [Object] An object of the present invention is to provide an intake valve device for an internal combustion engine, which is an engine having two intake ports and which prevents interference of air flow between the ports. In an intake valve device provided in a cylinder head of an internal combustion engine having two intake ports, an angle 4a of a seating surface of a valve seat 6 of a first intake valve 4 corresponds to a valve seat 7 of a second intake valve 5. Is smaller than the seating surface angle 5a.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an intake valve device provided in a cylinder head of an internal combustion engine having two intake ports.

[0002]

[Prior art]

 It is known that in a diesel engine having two intake ports, one port has a directional shape and the other port has a spiral shape.

[0003]

[Problems to be solved by the device]

 In these engines, for example, as shown in FIGS. 4 and 5, the airflow sucked from the spiral port 11 and the airflow sucked from the directional port 12 interfere with each other as indicated by A, and The vortex B is generated in the air, the air flow rate is reduced and the swirl is disturbed, and the fuel and the air cannot be properly mixed, so that there is a problem that fuel efficiency and smoke are deteriorated.

Therefore, there is a technique for reducing one of the ports or changing the height, but the structure is complicated (see Japanese Patent Laid-Open Nos. 56-146015 and 57-56621).

Further, there are JP-A-51-104114 and JP-A-51-104115, but this is a technique for weakening the swirl by providing a guide body in a direction in which the valve resists the swirl. The technique of Japanese Patent Laid-Open No. 58-2308 reduces the suction resistance with one valve, and neither of them relates to the subject of the present application.

Therefore, an object of the present invention is to provide an intake valve device for an internal combustion engine which prevents interference of air flows in an engine having two intake ports.

[0007]

[Means for Solving the Problems]

 According to the present invention, in the intake valve device provided in the cylinder head of the internal combustion engine having two intake ports, the angle of the seating surface with the valve seat of the first intake valve is different from that of the valve seat of the second intake valve. It is configured to be smaller than the angle of the seating surface.

[0008]

[Action]

 In the intake valve device for an internal combustion engine configured as described above, since the air flowing into the cylinder from the first intake valve and the air flowing in from the second intake valve have different angles, they do not interfere with each other. , The amount of inflowing air becomes large.

[0009]

[Preferred Embodiment]

 It is preferable to make the angle of the valve of the spiral port small to cause swirl, and to make the angle of the valve of the directal port large, because the amount of inflowing air becomes large.

[0010]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. In FIGS. 1 and 2, the cylinder head 1 is provided with a spiral port 2 and a directional port 3.

An intake valve 4 which is a first intake valve is slidably attached to the spiral port 2, and an intake valve 5 which is a second intake valve is slidably attached to the directionial port 3. Has been.

The angle 4a (for example, 30 degrees) of the seating surface of the intake valve 4 with the valve seat 6 is smaller than the angle 5a (for example, 45 degrees) of the seating surface with the valve seat 7 of the intake valve 5. .

Therefore, referring to FIG. 3, the air flow C from the spiral port 2 does not interfere with the air flow D from the directional port 3 at E, and is swirled to the lower part of the second intake valve. F does not occur.

Further, since the valve angle 5a of the intake valve 5 is large, the downward inflow velocity becomes large and the flow rate increases.

When the first intake valve having a small valve angle is attached to the differential port 3 and the second intake valve having a large valve angle is attached to the swirl port 2, the total flow rate is reduced. , Interference is reduced and swirl disturbance can be prevented.

[0016]

[Effect of device]

 Since the present invention is configured as described above, there is no interference between the airflows flowing in from the two ports and the swirl is not disturbed, so fuel consumption is improved and smoke is reduced.

[Brief description of drawings]

1 is a cross-sectional view taken along line XX of the cylinder head of FIG. 2 showing an embodiment of the present invention.

FIG. 2 is a plan view showing two intake ports of the cylinder head of FIG.

FIG. 3 is a schematic diagram showing the flow of air through the two ports of FIG.

FIG. 4 is a plan view of a cylinder head showing an example of a conventional technique.

5 is a schematic diagram showing an air flow in the YY cross section of FIG. 4;

[Explanation of symbols]

 1 ... Cylinder head 2, 11 ... Spiral port 3, 12 ... Directional port 4 ... 1st intake valve 5 ... 2nd intake valve 6, 7 ... Valve seat

Claims (1)

[Scope of utility model registration request] 1. An intake valve device provided in a cylinder head of an internal combustion engine having two intake ports, wherein an angle of a seating surface with a valve seat of a first intake valve is seated with a valve seat of a second intake valve. An intake valve device for an internal combustion engine, wherein the intake valve device is configured to be smaller than a surface angle.