JPH0442499Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a variable swirl port, and in particular to a variable swirl port that can remove oil and other deposits that adhere to the air passage that introduces air that weakens the strength of the intake swirl. Regarding.

[Prior Art] In an internal combustion engine, in order to properly burn the mixed gas in the combustion chamber, an intake port is used to swirl the intake air flow supplied from the intake air system to form an intake swirl in the combustion chamber. Are known.

3 and 4 show an intake port 2 employed in a diesel engine.

As shown in the figure, an intake port 2 is opened at the top of a combustion chamber 1 . The intake port 2 is bent just before the combustion chamber 1 so as to form an intake flow path from the intake air system and to swirl the intake air flow to form a swirling flow within the combustion chamber 1. An intake valve 3 that opens and closes the intake port 2 is provided at the opening of the intake port 2 that opens into the combustion chamber 1 .

Further, the intake port 2 has an air passage 4 opened therein. The air passage 4 is configured to bypass a portion of the swirling intake air flow passing through the intake port 2 from the upstream side to the downstream side, thereby weakening the intensity of the swirling air flow sucked into the combustion chamber 1. There is.

An on-off valve 5 is provided at an inlet opening on the inlet side of the air passage 4 to open and close it in accordance with the load of the internal combustion engine.

The on-off valve 5 is configured to be operated by an air cylinder 7 fixed to an intake cover 6 provided to cover the upstream side of the intake port 2. This air cylinder 7 has an air pipe 8
is connected to the air pipe 8, and a solenoid valve 9 for opening and closing the air pipe 8 is provided.

Therefore, when the on-off valve 5 opens and closes the inlet of the air passage 4, the pressure at the stagnation point of the intake air flow in the air passage 2 changes, and the swirl ratio thereof changes.

[Problems to be solved by the invention] By the way, the amount of intake air passing through the air passage 4 that is formed approximately along the intake port 2 changes depending on its diameter, which affects the swirl ratio and reduces internal combustion. This will change the performance of the engine and the amount of exhaust gas. However, oil mist in the blow-by gas and soot contained in the blow-back gas adhere to the outlet of the air passage 4, causing it to become clogged or small. Therefore, in the past, even if the on-off valve 5 was operated to open the inlet of the air passage 4, a sufficient bypass amount of the intake air flow could not be obtained, and the swirl ratio did not change.

Incidentally, as a related technique, ``Intake Port of Internal Combustion Engine'' (Japanese Utility Model Publication No. 1984-8404) has been proposed.

[Purpose of the invention] This invention was devised to effectively solve the conventional problems, and its purpose is to prevent the outlet of the air passage from becoming clogged with deposits such as oil mist. The object of the present invention is to provide a variable swirl port that can maintain engine performance or exhaust gas volume at the best conditions.

[Summary of the invention] In order to achieve the above object, the present invention opens an outlet of an air passage that introduces air that weakens the intake swirl strength into an intake port, and extends a rod that can be inserted into and removed from the outlet. It is equipped with an on-off valve that opens and closes the outlet.

[Example] An example of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in FIG. 1, a cylinder head 10 is provided with an intake port 2 that opens into a combustion chamber 1. As shown in FIG.
This intake port 2 forms a passage for the intake air flow supplied from the intake system, and is bent to swirl the intake air flow to form a swirl flow in the combustion chamber 1 located on the downstream side. has been done. An opening 11 through which this intake port 2 opens into the combustion chamber 1
is provided with an intake valve 3 that opens and closes it.

Further, the air passage 12 is formed by passing through, along the flow direction, a protrusion 13 that is exposed by thickening the inner wall of the intake port 2 inward. This air passage 12 is formed in a substantially linear shape, and is a bypass passage that introduces a part of the intake air flow passing upstream of the intake port 2, bypasses it to the downstream side, and weakens the strength of the intake swirl formed on the downstream side. form. The air passage 12 has a predetermined diameter and is located on the downstream side so that the bypass amount of the upstream intake air passing through it can vary the pressure at the stagnation point of the intake air formed near the intake valve 3. An outflow port 14 is formed facing the stagnation point.

In particular, in the present invention, the air passage 12 is in a closed state.
The air outlet 14 is closed and the air passage 1 is opened.
This is characterized by the provision of an on-off valve 15 that allows the two to communicate with each other. As shown in the figure, the on-off valve 15 extends into and out of the outlet 14 so as to be freely inserted into and removed from the outlet 14.
It is constituted by a rod that opens and closes and is guided along a through hole 16 formed in the raised portion 13. Therefore, the through-hole 16 has a common opening with the outlet 14.

Further, the on-off valve 15 that is protruded into the outlet 14 of the air passage 12 and closes it is also connected to the outlet 14 of the air passage 12 at the same time.
It is configured to push out and remove deposits such as oil mist that adhere to the surface.

This on-off valve 15 is attached to an air cylinder 1 that is inclined along the axial direction of the on-off valve 15 via a fitting 17 to an intake cover 6 that covers the upstream side of the intake port 2.
8. An air pipe 19 is connected to the air cylinder 18.
This air pipe 19 is opened and closed by a solenoid valve 20.

In this way, by providing the on-off valve 15 that closes the outlet 14 simultaneously with the closing operation of the outlet 14 of the air passage 12, deposits such as oil mist that adhere to and accumulate on the outlet 14 are removed and cleaned. This makes it possible to obtain a swirling flow commensurate with the load of the internal combustion engine. Therefore, the performance of the internal combustion engine, the exhaust gas level, and the durability of the cylinder head 10 and the like can be maintained at their best.

FIG. 2 shows another embodiment of the present invention.

As shown in the figure, the on-off valve 15 is formed into a rod shape and is provided so as to be able to reciprocate from the upstream side to the downstream side of the air passage 21. Also air passage 2
1 has an upstream side thereof formed with an enlarged diameter than the shaft diameter of the on-off valve 15, and an outflow port 14 located on the downstream side, which is formed to have a predetermined diameter as in the above embodiment. There is. That is, the air passage 21
A diameter-reduced portion 22 is formed in the outlet 14 to guide the insertion and removal movement of the on-off valve 15 that opens and closes the outlet 14.

In this way, the on-off valve 15 is connected to the valve seat 22 of the outlet 14.
By engaging with , the outlet 14 can be opened and closed, and the outlet 14 can be prevented from being clogged with deposits.

[Effects of the invention] In summary, the present invention provides the following excellent effects.

(1) Since the outlet is opened and closed by extending the rod into the outlet of the air passage so that it can be inserted and removed, it is possible to prevent the hole from clogging due to adhesion of oil mist, etc., and it is necessary to provide a means for removing deposits separately from the on-off valve. Therefore, it is possible to obtain the best swirl flow according to the load of the internal combustion engine.

(2) The performance and durability of the internal combustion engine can be maintained at their best.

[Brief explanation of the drawing]

Fig. 1 is a schematic cross-sectional view showing the main parts of one embodiment of the present invention, Fig. 2 is a schematic cross-sectional view showing another embodiment, Fig. 3 is a perspective view showing a conventional example, and Fig. 4 is a schematic cross-sectional view showing the main part of an embodiment of the present invention. FIG. In the figure, 2 is an intake port, 12 and 21 are air passages, 14 is an outlet, and 15 is an on-off valve.

Claims (1)

[Scope of utility model registration request] A variable valve characterized by opening an outlet of an air passage that introduces air that weakens intake swirl strength into an intake port, and providing an opening/closing valve that opens and closes the outlet by extending a rod that can freely retract into the outlet. Swirl port.