JP2015045286A - Vehicle internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To remove water intruding into a dirty chamber in a harmless state without opening a draining hole in a case at an air cleaner of a vehicle internal combustion engine.SOLUTION: An air cleaner includes a dirty chamber 21 and a clean chamber 22 which are divided by a filter element 20, and an air intake port 23 opens in the dirty chamber 21 and an air outlet port 24 opens in the clean chamber 22. A bottom of the dirty chamber 21 is connected with an exhaust passage 15 by a bypass passage 27 and a valve chamber 26 is provided at a bottom part of the dirty chamber 21. A valve body 31 which is operated by a float is disposed in the valve chamber 26. When water accumulates in the valve chamber 26, the valve body 31 opens to discharge the water from the bypass passage 27 to the exhaust passage 15.

Description

  The present invention relates to a vehicle internal combustion engine equipped with an air cleaner.

  The air cleaner of an internal combustion engine has a case and a filter element. The inside of the case is divided into a dirty chamber and a clean chamber by the filter element, an air intake port is provided in the dirty chamber, and an air outlet is provided in the clean chamber. It is configured. In any case, rainwater and washing water may enter the dirty chamber from the air intake, and there may be a drain hole at the bottom of the dirty chamber.

  Now, in the case of an internal combustion engine for automobiles, depending on the structure of the automobile, the vertical height of the engine room may be restricted, and there is a case where the internal combustion engine must be disposed in a slanted posture with a large inclination. . In this case, the air cleaner often has to be disposed below the engine room. However, the lower part of the engine room may be submerged in water due to flooding of roads and the like due to heavy rain and flooding, and water in the dirty room may enter from the drain hole.

  On the other hand, if the air intake is below the dirty chamber, water may flow from the air intake due to flooding or the like. In this regard, Patent Document 1 discloses a configuration in which a main duct and a sub duct are connected to a dirty chamber of an air cleaner, a float valve that is closed by intrusion of water is provided in the main duct, and air is sucked from the sub duct into the air cleaner when the float valve is closed. Has been. In this Patent Document 1, water enters the main duct until the float valve is completely closed. Therefore, an extension chamber (water tank) communicating with the main duct is provided, and a drain hole is provided at the bottom of the extension chamber. ing.

JP 2005-155439 A

  In Patent Document 1, since it is necessary to provide a main duct and a sub duct, there is a problem that the structure is complicated and the cost is increased (in the first place, if there is a space where a sub duct that is not affected by submergence can be placed, both the main duct and There seems to be no need to install a sub duct.)

  Also, in the situation where the main duct is submerged, the expansion chamber located below the main duct is already submerged.Therefore, there is a possibility that water flows into the expansion chamber from the drain hole and is sucked into the air cleaner. high. Therefore, it is doubtful whether it is a drastic measure.

  The present invention was made to improve such a current situation, and water that flows into the dirty chamber in a normal state is properly treated while preventing inundation of the dirty chamber by flooding or the like. is there.

  The present invention relates to an internal combustion engine having an engine body and an air cleaner. An exhaust passage is connected to the engine body, while the air cleaner has a dirty chamber and a clean chamber partitioned by a filter element. The dirty chamber has an air intake opening and the clean chamber has an air outlet, so that water can enter the dirty chamber from the air intake opening.

  The dirty chamber of the air cleaner and the exhaust passage are connected by a bypass passage in which negative pressure is applied by exhaust gas passing through the exhaust passage, and a water passage valve is connected to the dirty chamber or the bypass passage of the air cleaner. Provided.

  In order to apply a negative pressure to the bypass passage, the bypass passage may be opened to the exhaust passage and a suction action like an ejector may be used. Moreover, a water flow valve can be provided in a connection part with a bypass channel in the bottom part of a dirty chamber, or can be provided in the arbitrary parts of a bypass channel. When the water flow valve is provided in the bypass passage, a part of the bypass passage can function as a water reservoir.

  The water flow valve may be a remote control type driven by an actuator such as an electromagnetic solenoid, but adopting a float valve that automatically opens and closes using the water level as in the embodiment makes the structure simple and cost-effective. Since it is excellent also in terms of surface, it is preferable.

  In the present invention, even if water flows into the dirty chamber from the air intake port, the water is excluded from the bypass passage to the exhaust passage through the water passage valve. Therefore, the water does not flow into the intake system or the combustion chamber, and the water does not adversely affect the intake system member or inhibit the combustion. Further, since water leaked into the exhaust passage is instantly evaporated by heat, the exhaust passage and the silencer are not adversely affected. Since the negative pressure in the bypass passage is generated using the dynamic pressure of the exhaust gas, the structure is simple and the operation is reliable.

  In addition, since it is not necessary to make a drain hole in the dirty room, water will enter the dirty room as long as the water level does not rise to the beginning of the air intake even if the dirty room is submerged in water due to flooding of the road, etc. There is nothing.

It is a schematic diagram of an embodiment. It is a figure which shows a negative pressure generation means. (A) (B) is a figure which shows an example of a water flow valve, (C) is a figure which shows the example applied to the horizontal type air cleaner, (D) is a figure which shows an example of the shielding means of a bypass passage.

(1). Outline of Internal Combustion Engine Next, an embodiment of the present invention will be described based on the drawings. First, the outline of the internal combustion engine will be described with reference to FIG.

  The internal combustion engine has an engine body 1 and an air cleaner 2. The engine body 1 includes a cylinder block 5 in which a cylinder bore 3 is formed and a crankshaft 4 is rotatably held, a cylinder head 6 fixed to the cylinder block 5 on the opposite side of the crankshaft 4, and a cylinder head 6 It has a fixed cylinder head cover 7 and an oil pan 8 fixed to the crankcase part of the cylinder block 5.

  The internal combustion engine of the present embodiment is a slant type, and the engine body 1 is greatly inclined so that the axis O of the cylinder bore 3 approaches the horizontal 9. An intake manifold 10 is connected to the lower surface of the cylinder head 6, and an intake passage 12 having a surge tank 11 is connected to the intake manifold 10. On the other hand, an exhaust manifold 13 is connected to the upper surface of the cylinder head 6, and an exhaust passage 15 including a catalyst case 14 is connected to the exhaust manifold 13.

  The air cleaner of this embodiment is a vertical type, and a case is constituted by a main body 17 that opens upward and a lid 18 that covers the main body 17 from above, and a filter element 20 is disposed inside the case. Therefore, the inside of the case is divided into a dirty chamber 21 positioned below the filter element 20 and a clean chamber 22 positioned above the filter element 20. The main body 17 has air opened to the dirty chamber 6. An intake port 23 is provided, and the lid 18 is provided with an air outlet 24 opened to the clean chamber 22. The air outlet 24 is connected to the intake passage 12 although it is not necessary to mention it.

  The main body 17 and the lid 18 are held by clips, but details are omitted. The outer periphery of the filter element 20 is sandwiched between the main body 17 and the lid 18 and is held so as not to be displaced.

(2). Water cleaner drainage structure The bottom of the dirty chamber 21 of the air cleaner 2 is provided with a downwardly recessed valve chamber (float chamber) 26, and from the catalyst case 14 of the lower end of the valve chamber 26 and the exhaust passage 15. The downstream part is connected by a bypass passage 27. A negative pressure is generated in the bypass passage 27 by the dynamic pressure of the exhaust gas. An example of the structure is shown in FIG.

  In the example shown in FIG. 2A, the suction port 28 which is the starting end portion of the bypass passage 27 is simply opened on the inner peripheral surface of the exhaust passage 15, but the suction port 28 is in the flow direction of the exhaust gas. By inclining so as to extend to the opposite side, air is sucked from the suction port 28 by the flow of exhaust gas. In addition, the suction port 28 is configured in a tapered shape having a cross-sectional area that increases as it approaches the exhaust passage 15, thereby exerting a stronger suction action by the exhaust gas.

  In the example shown in FIG. 2 (B), the suction port 28 is inclined as in FIG. 2 (A), and its distal end projects into the exhaust passage 15. In this example, since the dynamic pressure of the exhaust gas acts more strongly on the opening edge of the suction port 28, a high negative pressure can be generated even if the suction port 28 is narrow (the pressure of the exhaust gas is the exhaust passage 15). It gets higher as you get closer to the center.

  The example shown in FIG. 2C is a modification of the example shown in FIG. 2B. The suction port 28 extends to the vicinity of the center of the exhaust passage 15 and the exhaust gas enters the outer peripheral portion of the suction port 28. A guide hole 29 is formed. In this example, since the air inside the suction port 28 is strongly drawn by the exhaust gas, a strong negative pressure can be applied to the bypass passage 27.

  In the example shown in FIG. 2D, an orifice portion 30 having a reduced inner diameter is formed in the exhaust passage 15, and a suction port 28 is opened in the enlarged diameter portion 30 a of the orifice portion 30. In this example, since the exhaust gas has a high flow velocity in the orifice portion 30, a strong negative pressure can be applied to the bypass passage 27.

  When water accumulates in the valve chamber 26 of the dirty chamber 21, the water flow valve opens and the water automatically flows into the bypass passage 27. An example of the water flow valve is shown in FIGS. In this example, the valve chamber 26 includes a large-diameter portion 26a connected to the bottom of the dirty chamber 21, an intermediate-diameter portion 26b connected to the tip (lower end), and a small-diameter portion 26c connected to the tip (lower end). It has a stepped and different diameter structure. A filter 26d that collects foreign matter is disposed on the large-diameter portion 26a.

  A ball valve 31 as an example of a valve body is fitted to the intermediate diameter portion 26b so as to be movable up and down, and a disk-like (or spherical) float 32 is arranged to be movable up and down on the large diameter portion 26a. The ball valve 31 and the float 32 are integrally connected by a rod 33. Therefore, the valve chamber 26, the ball valve 31 and the float 32 constitute a water flow valve.

  When the ball valve 31 hits the upper end of the small diameter portion 26c, the small diameter portion 26c and the bypass passage 27 are closed. In this state, the float 32 is positioned slightly above the lower end of the large diameter portion 26a. Accordingly, the state where the ball valve 31 blocks the upper end of the small diameter portion 26c is maintained. Further, since a negative pressure is acting on the bypass passage 27, the state in which the ball valve 31 blocks the small diameter portion 26c with the negative pressure is maintained.

  When water enters the dirty chamber 21 for some reason and flows into the valve chamber 26, the state where the small diameter portion 26c is blocked by the ball valve 31 is maintained until the water level reaches the lower surface of the float 32. When the float 32 is reached, the float 32 rises, whereby the ball valve 31 is detached from the small diameter portion 26c, and the valve chamber 26 and the bypass passage 27 communicate with each other. Thereby, the water accumulated in the valve chamber 26 is discharged from the bypass passage 27 to the exhaust passage 15. Therefore, the water flowing into the dirty chamber 21 does not adversely affect the members of the intake system or inhibit the combustion.

  In the illustrated example, the ball valve 31 and the float 32 are connected by the rod 33, but the ball valve 31 and the float 32 may be integrated without using the rod 33. Since the float 32 needs to be lifted with a small amount of water in order to open the valve with a slight accumulation of water, it is reasonable to integrate the ball valve 31 and the float 32. Although it is preferable to close the valve after water has completely drained from the valve chamber, a damper device may be provided so that the return of the ball valve 31 becomes slow.

(3) Other Variations The embodiment shown in FIG. 3C is applied to a horizontal air cleaner 2 in which a dirty chamber 21 and a clean chamber 22 are arranged on the left and right of the filter element 4. In the case of such a horizontal type, since there is a possibility that water may flow into the clean chamber 22, the dirty chamber 21 and the clean chamber 22 are connected to the valve chamber 35 by the branch pipe 34.

  Now, if water enters the air cleaner 2 while the internal combustion engine is stopped, this may flow into the exhaust passage 15 via the bypass passage 27, which may cause corrosion of the exhaust passage 15. is there. In this regard, in FIG. 3D, consideration is given to automatically closing the bypass passage 27 while the internal combustion engine is stopped.

  That is, in the example of FIG. 3D, an on-off valve 36 is provided in the middle of the bypass passage, and the on-off valve 36 is set to be driven by the piston 38 of the diaphragm 37, and the drive chamber of the diaphragm 37 and the exhaust passage 15 Are connected by a pipeline 39.

  In this example, when the engine is stopped, the piston 38 of the diaphragm 37 is pushed by the spring 40 and the on-off valve 36 is closed. When the engine is started, the negative pressure acting on the pipe line 39 causes the diaphragm 37 to move. Pishin 38 moves backward against the spring 40 and the on-off valve 36 opens. Therefore, even if water is accumulated in the dirty chamber 21 or the bypass passage 27 while the operation of the engine is stopped, the water is discharged to the exhaust passage 15 and evaporated when the operation is started.

  The present invention can be embodied in various ways other than the above embodiment. For example, the valve chamber may be provided in an appropriate part of the bypass passage. Various valves such as a needle valve and a butterfly valve can be used as the water flow valve.

  The present invention can be embodied in an internal combustion engine with an air cleaner. Therefore, it can be used industrially.

DESCRIPTION OF SYMBOLS 1 Engine main body 2 Air cleaner 6 Cylinder head 10 Intake manifold 12 Intake passage 13 Exhaust manifold 15 Exhaust passage 19 Case 20 Filter element 21 Dirty chamber 22 Clean chamber 23 Air intake port 24 Air outlet 26 Valve chamber (float chamber)
27 Bypass passage 28 Suction port 31 Ball valve 32 Float

Claims (1)

It has an engine body and an air cleaner,
While an exhaust passage is connected to the engine body,
The air cleaner has a dirty chamber and a clean chamber partitioned by a filter element. The dirty chamber has an air intake opening and the clean chamber has an air outlet. The water can enter the dirty room from
The dirty chamber of the air cleaner and the exhaust passage are connected by a bypass passage in which negative pressure is applied by exhaust gas passing through the exhaust passage, and a water flow valve is provided in the dirty chamber or bypass passage of the air cleaner. Yes,
Internal combustion engine for vehicles.

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