JPS6315588Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to an air cleaner for internal combustion engines.
In particular, the present invention relates to an air cleaner suitable as an air cleaner for an internal combustion engine of a vehicle equipped with an exhaust brake.

Large vehicles such as large trucks and large buses are equipped with exhaust brakes, which are used as auxiliary brakes when going downhill. This exhaust brake, as is well known, is a system in which a valve is provided in the exhaust pipe to close the exhaust pipe, and the engine acts as a compressor to perform braking.

By the way, in a vehicle that uses an exhaust brake in this way, there is a problem that pulsations are generated in the intake system of the internal combustion engine when the exhaust brake is activated, and the pulsations are emitted from the air cleaner and reach the inside of the cab, resulting in muffled noise. Ta.

Fig. 1 shows an example of a conventional air cleaner 1, in which intake air is sucked in from the air cleaner suction port 2, passes through the air cleaner element 7, and enters the engine from the air cleaner outlet 8 through a duct (not shown). enter. In the case of such a conventional air cleaner, as described above, the pulsations generated in the intake system of the internal combustion engine when the exhaust brake is activated are emitted to the outside through the air cleaner and reach the inside of the cab, resulting in muffled noise.

By the way, the applicant connected an air intake introduction box with a larger opening area than the duct to the air cleaner through a short duct, and this air intake introduction box can separate air and water, prevent dust, snow, etc. from entering, and reduce intake resistance. proposed a technology to measure this (Utility Model Application Publication No. 154523/1983).

According to this technology, air and water can be separated using an intake introduction box.
In addition to preventing dust, snow, etc. from getting in, and reducing intake resistance, the intake box acts as a kind of surge tank and weakens the pulsations that occur in the intake system, reducing muffled noise in vehicles equipped with exhaust brakes. However, since the air intake introduction box was provided separately from the air cleaner, there was a problem with the installation space for the air intake introduction box, and the air intake introduction box had to be manufactured separately from the air cleaner. This also led to an increase in costs, and it was not always perfect as a surge tank to eliminate pulsations that occur in the intake system.

Examples of air cleaners for reducing intake noise of internal combustion engines include Japanese Utility Model Publication No. 56-50126 and Japanese Unexamined Patent Publication No.
It is disclosed in Publication No. 57-354, etc. However, none of these known techniques apply an exhaust brake, and no countermeasures have been taken against muffled noise caused by pulsation in the intake system of the internal combustion engine that occurs when the exhaust brake is activated.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an air cleaner for an internal combustion engine that can prevent muffled noise due to pulsation in the intake system that occurs when the exhaust brake is activated.

According to the present invention, the outlet of the exhaust manifold is provided with a blocking valve constituting the exhaust shutter, and an operating cylinder for opening and closing the blocking valve is provided, and the internal combustion engine of the vehicle is provided through a duct in the intake manifold. In an engine air cleaner, an intake passage having a suction port opening facing downward is formed in the air cleaner body, a surge tank is provided at the opening between the intake passage and the air cleaner body, and the intake passage and the surge tank are The surge tank and the air cleaner body communicate through the narrow inlet.

Therefore, the intake air that is drawn in flows into the intake passage through the downwardly opening suction port, flows into the surge tank through the narrow inlet, and from the surge tank flows into the air cleaner body through the narrow inlet. .

The pulsations that occur in the intake system when the exhaust brake is applied are transmitted to the air cleaner body, but the pulsations are attenuated by the air cleaner body, which has a large capacity, and are then passed through the narrow inlet between the surge tank and the surge tank. is attenuated by
Further, since the air is attenuated in the intake passage through the inlet between the intake passage and the intake passage, the damping effect is doubled, and almost no leakage occurs from the downward suction port. Therefore, muffled noise due to pulsation when the exhaust brake is activated does not occur inside the cab.

Furthermore, since the intake air passes through the narrow inlet twice when flowing in, the air-water separation effect is improved, and rainwater that has flowed in does not flow into the intake manifold.

Furthermore, both the surge tank and intake passage can be configured using part of the air cleaner body.
Since it is integrated with the air cleaner, there is no problem with the installation space, and even if a surge tank is provided, the cost will not increase significantly.

Embodiments of the present invention will be described below with reference to the drawings.

In Figures 2 and 3, 2 is an air cleaner suction port, 3 is an intake passage that separates air and water, and 4 is an air cleaner suction port.
is the inlet of the surge tank, 6 is the inlet of the air cleaner body, 7 is the air cleaner element, that is, the air cleaner body, and 8 is the outlet of the air cleaner. The inlets 4 and 6 constitute a narrow passage as shown. Intake air is sucked in through the air cleaner's suction port 2 that opens downward, and while passing upward through the intake passage 3, air and water are separated, and then enters the air cleaner element through the inlet 6 of the air cleaner body. Dust such as dirt contained in the air is removed by passing through the air cleaner 7, and the intake air enters the engine through the duct from the air cleaner outlet 8, which is the same as in the conventional system shown in Fig. 1. A surge tank 5 is provided on the inlet 6 side of the air cleaner body 7, and the surge tank 5 is constructed by using a part of the housing 7a of the air cleaner body 7, and is integrated with the air cleaner 1. .

Therefore, the intake air sucked in from the suction port 2 of the air cleaner 1 is transferred to the air cleaner body 7.
Before entering the surge tank, enter the surge tank 5 from the surge tank inlet 4, and then enter the air cleaner body 7 from the inlet 6.
It then passes through the air cleaner body 7 and enters the engine through a duct from the air cleaner outlet 8. As the intake air passes through the surge tank 5 in this way, the pulsation that occurs in the intake system of the engine when the exhaust brake is applied is eliminated, and the noise that occurs during the exhaust brake is reduced without going out to the outside.

The surge tank 5 is made of sheet metal like the air cleaner body 7, and is attached to the air cleaner body 7 by welding. Furthermore, as shown in the figure, by making the intake air flow into the surge tank 5 from below the surge tank 5 and into the air cleaner main body 7 from above the air cleaner main body 7,
The effect of steam/water separation can be further enhanced. Also, by changing the capacity of the surge tank 5, tuning with the engine intake system can be achieved.

FIG. 4 shows an example in which an air cleaner equipped with the above-mentioned surge tank is attached to the intake system of an internal combustion engine of an automobile equipped with an exhaust brake. Engine 1
0 is equipped with an intake manifold 11 and an exhaust manifold 12, and the above-mentioned air cleaner 1 provided with a surge tank 5 is connected to the intake manifold 11 via a duct 13, and air is sucked in from the suction port of the air cleaner 1. The intake air enters the intake manifold 11 through a surge tank 5, an air cleaner body 7 containing an air cleaner element, and a duct 13. Further, a closing valve 14 which is an exhaust shutter is provided at the outlet of the exhaust manifold 12, and this closing valve 14 is opened and closed by an air cylinder 15.

The air cylinder 15 is operated by turning on and off the exhaust brake switch 18, clutch switch 20, and accelerator switch 21 to operate a magnetic valve 17 interposed in a pipe 16 leading from an air reservoir (not shown) to the air cylinder 15. This is done by 19 is a pilot lamp.

Therefore, when using the exhaust brake as an auxiliary brake when descending a slope, each of these switches 18, 20, and 21 is turned on and the magnetic valve is operated to communicate with the pipe 16.
The air cylinder 15 closes the occlusion valve 14 . For this reason, exhaust gas escapes into the intake system, causing pulsation and noise. However, as mentioned above, since the air cleaner 1 is equipped with the surge tank 5, the pulsation that occurs in the engine intake system during exhaust braking can be avoided. This eliminates the problem and reduces noise during exhaust braking.

As explained above, according to the present invention, the pulsation that occurs in the engine's intake system when the exhaust brake is applied can be eliminated by the surge tank installed in the air cleaner, thereby reducing noise during the exhaust brake. Since it is constructed using the housing of the air cleaner itself and is integrated with the air cleaner, there is no problem with the installation space for installing a surge tank, and even if a surge tank is installed, the cost will not increase significantly. It is something.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a conventional air cleaner for an internal combustion engine. 2 and 3 show an air cleaner equipped with a surge tank according to an embodiment of the present invention, with FIG. 2 being a perspective view and FIG. 3 being a cross-sectional view. FIG. 4 is a piping and wiring diagram showing an air cleaner according to an embodiment of the present invention installed in the intake system of an internal combustion engine of a vehicle equipped with an exhaust brake. 1...Air cleaner, 2...Suction port, 3...
Intake passage, 4... Surge tank inlet, 5... Surge tank, 6... Air cleaner main body inlet, 7...
...Air cleaner element, 8...Air cleaner exit.

Claims (1)

[Scope of utility model registration request] In an air cleaner for an internal combustion engine of a vehicle, the outlet of the exhaust manifold is provided with a blocking valve that constitutes an exhaust shutter, and is provided with an operating cylinder that opens and closes the blocking valve, and is provided through a duct to the intake manifold. An intake passage 3 having a suction port 2 facing downward and opening is formed in the air cleaner body 7, and a surge tank 5 is provided at the opening between the intake passage 3 and the air cleaner body 7. The surge tank 5 and the air cleaner main body 7 communicate through a narrow inlet 6.
An air cleaner for an internal combustion engine, characterized in that the air cleaner communicates with the air cleaner via the air cleaner.