JPH0442500Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an outflow passage cleaning device for a swirl adjustment device that is equipped with an outflow passage that allows swirl-adjusted air to flow out into the intake passage for swirl control. The present invention relates to an outflow passage cleaning device for a swirl adjustment device to prevent clogging caused by adhesion and accumulation of carbon, etc.

[Prior Art] As shown in Fig. 3, a swirl adjusting device has an air outlet 2 opened facing an air intake passage 1 which is formed in a helical shape or the like and generates an air intake swirl, and from which the air flows into the air intake swirl. Swirl adjustment air for weakening the swirl strength is discharged, and intake swirl commensurate with the engine operating condition is sucked into the cylinder. For example, as shown in the figure, an outflow passage 3 is branched to introduce a part of the intake air to the upstream side of the intake passage 1 and communicated with the outlet 2, and the opening and closing of the outflow passage 3 is controlled by an on-off valve 4. There is a device that adjusts the intake swirl by appropriately letting out a part of the air as swirl adjustment air. Further, Japanese Utility Model Application Publication No. 53-8408 also discloses an "intake port for an internal combustion engine" having a similar configuration.

[Problems to be solved by the invention] By the way, in the case of the swirl adjusting device having the above-mentioned outlet 2, the use of EGR, blowback of combustion gas from inside the cylinder, blow-by gas, etc. may cause the swirl adjustment device to accumulate in the intake passage 1. Foreign substances such as carbon,
There was a risk that the particles would adhere to and accumulate in the outlet 2 opened in the intake passage 1, causing clogging, and as a result, it would become impossible to perform appropriate swirl adjustment at an early stage.

[Purpose of the invention] The present invention was devised in view of the above-mentioned problems, and its purpose is to prevent foreign matter such as carbon from accumulating in the outflow passage in a swirl adjustment device having an outflow passage. An object of the present invention is to provide an outflow passage cleaning device for a swirl adjusting device, which can appropriately remove clogging, prevent clogging, and improve the reliability of the swirl adjusting device.

[Structure and operation of the invention] The invention opens into an air supply passage that generates an air supply swirl and sucks it into the cylinder, and branches from an exhaust passage into an outflow passage through which swirl-adjusted air for weakening the swirl strength flows out. The present invention is characterized in that an exhaust gas supply passage for supplying the exhaust gas flow is connected to the exhaust gas supply passage, and a check valve that is opened by a predetermined exhaust pressure when the exhaust brake is activated is provided in the exhaust gas supply passage. According to this configuration, when the exhaust pressure in the exhaust passage increases to exceed a predetermined pressure due to the operation of the exhaust brake, the check valve is operated to open, and the pressurized exhaust gas passes through the outflow passage and exits from its outlet. It is forcefully sprayed into the air supply passage. As a result, foreign substances such as carbon that tend to adhere and accumulate are removed from the outflow passage and the vicinity of the outflow port, and clogging of the outflow passage is prevented, thereby improving the reliability of the swirl adjustment device.

[Embodiment] A preferred embodiment of the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 shows a swirl adjusting device having a configuration substantially similar to that described in the conventional example.
That is, the cylinder head 5 is formed with an intake passage 1 that generates an intake swirl and draws it into the cylinder 6. An outlet 2 is opened in the vicinity of the intake port 7 of the intake passage 1 to allow swirl-adjusted air to flow out in order to weaken the swirl strength of the generated intake swirl. An outflow passage 3 that passes through the cylinder head 5 and communicates with an intake pipe 8 forming a part of the intake passage 1 is connected to the outflow port 2, so that a part of the intake air is introduced as swirl adjustment air. It's getting old. Further, an opening/closing valve 4 is provided at the intake pipe side opening of the outflow passage 3 to open and close it to control the outflow of the swirl adjustment air. This swirl adjustment device is provided in each cylinder 6, respectively.

The outflow passage 3 of the swirl adjustment device configured as described above includes an exhaust gas supply passage 1 that is branched from an exhaust passage 10 that communicates with the exhaust port 9.
1 is connected. Specifically, exhaust gas supply passage 1
1 is formed to penetrate inside the cylinder head 5 and is directly connected to the outflow passage 3 between the on-off valve 4 and the outflow port 2. Further, in the illustrated example, the exhaust passage 10 of one cylinder 6 is arranged to communicate with all outflow passages 3 provided for each cylinder 6. The exhaust gas supply passage 11 is adapted to introduce the exhaust gas flow flowing out into the exhaust passage 10 and allow it to flow out to the outlet 2.

A check valve 12 is provided in the exhaust gas supply passage 11 as passage opening/closing means for opening and closing the exhaust gas supply passage 11 . This check valve 12 has a known configuration, and the exhaust pressure of the exhaust gas introduced from the exhaust passage 10 causes the valve body to
3 is operated to open against a spring 14. In particular, in the present invention, the increased exhaust pressure when the exhaust brake is activated is used as the exhaust pressure in the exhaust passage 10 to open the check valve 12.

Here, the exhaust brake is mainly connected to the exhaust passage 10.
Braking force is obtained by increasing the exhaust pressure by throttling the exhaust valve 15 provided in the exhaust brake switch.
Manually turning on S _W1 , turning on the accelerator pedal switch S _W2 by taking your foot off the accelerator pedal.
ON, and when the clutch switch S _W3 is ON due to the clutch being in the continuous state, the exhaust passage 10
The exhaust valve 15 is closed, and the intake throttle valve 16 provided in the intake passage 1 is also closed. Further, the on-off valve 4 also closes the outflow passage 3 at the same time to stop the swirl adjustment. Due to such operation of the exhaust brake, the exhaust passage 10
When the exhaust pressure inside is increased and exceeds a predetermined pressure, the check valve 12 located upstream of the exhaust valve 15 is opened. The pressurized exhaust gas flow is vigorously ejected from the outlet 2 through the exhaust gas supply passage 11, and as a result, foreign matter such as carbon that tends to adhere and accumulate can be removed from the vicinity of the outlet 2.
It is possible to prevent clogging and improve the reliability of the swirl adjustment device.

In particular, the present invention utilizes the exhaust gas flow to remove foreign matter, which does not require a separate pressure fluid source to perform the same function, and is simple in structure. This is also effective from the standpoint of fuel efficiency. Furthermore, since the outflow port 2 is cleaned when the exhaust brake is activated, there are the following advantages.

When the exhaust brake is activated, no combustion occurs within the cylinder 6, so the exhaust gas is relatively clean, and there is almost no problem even if it is blown into the intake passage 1 from the outlet 2. Incidentally, as shown in FIG. 1, a filter 17 may be attached to the exhaust gas supply passage 11 to further purify the exhaust gas.

Further, since no combustion occurs within the cylinder 6, there is no adverse effect even if the exhaust gas flow ejected from the outlet 2 interferes with the intake air. Therefore, the on-off valve 4
The outflow passage 3 is also closed.

Since blow-by gas during exhaust brake operation is considered to be the main cause of foreign matter accumulation, it is extremely effective to clean the outlet 2 at this time.

Furthermore, in combination with a passage opening/closing means that is operated by the increased exhaust pressure of the exhaust passage 10, foreign matter can be forcibly removed by ejecting the increased exhaust gas flow, and the foreign matter can be forcibly removed simply by the negative pressure suction force of the intake port 7. Foreign matter can be removed more effectively than in the case where the exhaust gas stream is allowed to flow out.

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

(1) By connecting the exhaust gas supply passage for supplying the exhaust gas flow branched from the exhaust passage to the outflow passage, even if foreign matter such as carbon adheres to the outflow port and accumulates, it can be properly removed by the exhaust gas flow. The reliability of the swirl adjustment device can be improved by preventing clogging of the outlet.

(2) Since the exhaust gas flow is used to clean the outlet, there is no need to provide a separate pressure fluid source, and the structure is extremely simple by simply forming an exhaust gas supply passage. This is also effective from the viewpoint of fuel efficiency.

[Brief explanation of the drawing]

FIG. 1 is a plan sectional view of a cylinder head showing a preferred embodiment of the present invention, FIG. 2 is an operating circuit diagram of an exhaust brake, and FIG. 3 is a side sectional view showing a general swirl adjusting device. In the figure, 1 is an intake passage, 2 is an outlet, 3 is an outflow passage, 6 is a cylinder, 10 is an exhaust passage, 11 is an exhaust gas supply passage, and 12 is a check valve exemplified as passage opening/closing means.

Claims (1)

[Scope of utility model registration request] Exhaust gas supply for supplying an exhaust gas flow branched from the exhaust passage to an air supply passage that generates a supply air swirl and sucks it into the cylinder, and an outflow passage that discharges swirl-adjusted air to weaken the swirl strength. An outflow passage cleaning device for a swirl adjustment device, characterized in that the exhaust gas supply passage is connected to a check valve that is opened by a predetermined exhaust pressure when an exhaust brake is activated.