JPH0355788Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an intake device provided in an intake system of an internal combustion engine. More specifically, the present invention relates to an improvement in the driving force required for swirl control in an intake device equipped with a swirl control means.

[Conventional technology]

In an internal combustion engine, an intake port D is generally provided in a cylinder head C so as to communicate with a combustion chamber B provided in a cylinder block A, as shown in FIG.
This intake port D is connected to an intake manifold, an air cleaner, etc., and constitutes an intake system.

Conventionally, among internal combustion engines, especially diesel engines, it is known that a movable plate 1 is attached inside the intake port D to perform swirl control of intake air. This movable plate 1 generally has a fourth
As shown in the figure, a movable support point P is set at the tip.

Incidentally, as a known document regarding an intake system for an internal combustion engine equipped with a swirl control means, for example,
There is a publication number 115823.

[Problem that the invention attempts to solve]

In the conventional technique shown in FIG. 4 described above, the movable plate 1
There is a problem in that the driving force required for swirl control becomes large due to the position of the movable support point P. Also,
In conjunction with this problem, it is necessary to increase the strength of the members for transmitting driving force and take measures against wear.
A problem has arisen in that the manufacturing of the device becomes complicated and the cost increases.

[Purpose of invention]

The present invention has been made to solve the above-mentioned problems, and its purpose is to reduce the driving force required for swirl control in an intake system of an internal combustion engine equipped with a swirl control means.

[Means for solving problems]

An intake system for an internal combustion engine according to the present invention is an intake system for an internal combustion engine in which a movable plate for swirl control is attached inside an intake port formed in a cylinder head so as to communicate with a combustion chamber provided in a cylinder block. The cross-sectional shape of the movable plate is an airfoil, and the movable support point of the movable plate is the aerodynamic center of the airfoil.

[Effect of invention]

The intake system for an internal combustion engine according to the present invention utilizes the aerodynamic center proven in aerodynamics to reduce the driving force.

[Example of idea]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an intake system for an internal combustion engine according to the present invention will be described below with reference to FIGS. 1 and 2.

In the present invention, the movable plate 1 in the conventional technology described above is
has an airfoil cross-sectional shape, and its movable support point P
is the aerodynamic center of the airfoil.

The movable support point P has a structure in which a shaft 2 passes through the movable plate 1. The shaft 2 is supported on the wall of a cylinder head C forming an intake port D, and an arm 3 is fixed outside the intake port D. An actuator 5 such as a diaphragm actuator is connected to this arm 3 via a transmission member 4 made of a wire or rod.

Therefore, the driving force of the actuator 5 is transmitted to the movable plate 1 via the transmission member 4, the arm 3, and the shaft 2 to perform swirl control of the intake air. Since it is set at the aerodynamic center of the model, it can be controlled with less driving force, as has been proven in aerodynamics. From this, the transmission member 4, arm 3
This makes it possible to reduce the strength and size of the engine, facilitate manufacturing, reduce costs, and facilitate installation in internal combustion engines. In addition, friction due to thrust between the shaft 2 and the cylinder head C is reduced, eliminating the need for special manufacturing work such as imparting wear resistance, improving the manufacturing effects and improving the durability of the device. Become.

[Effect of idea]

As described above, the intake device for an internal combustion engine according to the present invention reduces the driving force required for swirl control, so there is no need to consider strength and wear resistance when manufacturing the device, and further miniaturization is possible, making the work easier. This has the effect of reducing the cost and making it possible to downsize the equipment, making installation easier, and reducing wear and tear on the equipment during use, improving durability.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing an embodiment of the intake device for an internal combustion engine according to the present invention, Fig. 2 is a side view showing an example of a control means for a movable plate, and Fig. 3 is a general structure of an intake port in an internal combustion engine. FIG. 4 is a sectional view showing a conventional example. 1...Movable plate, A...Cylinder block, B...
...Combustion chamber, C...Cylinder head, D...Intake port, P...Movable support point.

Claims (1)

[Scope of utility model registration request] In an intake system for an internal combustion engine in which a movable plate for swirl control is installed inside an intake port formed in a cylinder head so as to communicate with a combustion chamber provided in a cylinder block, the cross-sectional shape of the movable plate is shaped like an airfoil. An intake system for an internal combustion engine, characterized in that the movable support point of the movable plate is the aerodynamic center of the airfoil.