JP2015068200A - Air cleaner device for on-vehicle internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent water from flowing into the inside of a case at flooding even if a draining hole is provided on a case, in an air cleaner device for a vehicular internal combustion engine.SOLUTION: An air cleaner device has a body 17 and an air introducing passage 22 connected to the body 17, and is provided with a draining hole 24 on the body 17. On a lower horizontal portion 22b of the air introducing passage 22, a valve device 25 for blocking the inside by the rising of a float 28 is provided. The valve device 25 has a valve body 27, a driven arm 30, and a driving arm 33, and the rising of the float 28 is converted into rotations of a valve body 27 through the rotational movement of both arms 30 and 33.

Description

  The present invention relates to an air cleaner device used for an internal combustion engine mounted on a vehicle (automobile).

  An air cleaner for an internal combustion engine has a case in which a filter element is built in. The inside of the case is partitioned by a filter element into a dirty chamber and a clean chamber. The clean air outlet is provided. In any case, rainwater and washing water may enter the case (dirty chamber) chamber from the air introduction passage, and there may be a drain hole at the bottom of the case.

  In the case of an internal combustion engine for a vehicle, depending on the structure of the vehicle, there may be restrictions on the vertical height of the engine room. . 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 the water due to flooding of roads and the like due to heavy rain or flood, and water may enter the case 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. With respect to this point, in Patent Document 1, a main duct and a sub duct are connected to a dirty chamber of an air cleaner, a float valve (one-way valve) is provided in the main duct to be closed when water enters, and when the float valve is closed, air is sucked into the air cleaner from the sub duct. The structure to perform is disclosed. 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.)

  In addition, in the situation where the main duct is flooded, the expansion chamber located below the main duct is already flooded, and then water flows into the expansion chamber from the drain hole and is sucked into the air cleaner and sucked into the intake system. There is a high possibility of running water. Therefore, it is doubtful whether it is a drastic measure. Furthermore, since the float valve (one-way valve) is exposed to water, the foreign matter mixed in the water may enter the shaft portion and return and not rotate, which may hinder engine start-up and operation.

  The present invention was made to improve such a current situation, and rain water and washing water flowed into the case room under normal conditions while accurately preventing or preventing water from entering the case during flooding. Exclusion of the case is made so that it can be performed accurately.

  The present invention provides an air cleaner apparatus in which a filter element is incorporated and a water drain hole is provided in a bottom portion of a case to which an air introduction passage is connected. In the air introduction passage, a vehicle is immersed in water when the engine is stopped. Even when the water level reaches the case, valve means is provided for blocking or inhibiting water from entering the case through the drain hole by closing the air introduction passage.

  The valve means can adopt various structures. First, as the structure of the valve body, various types such as a butterfly type, a needle type, and an open / close lid type can be adopted. As a driving means for moving the valve body by raising the water level, the movement of the float that moves according to the water level may be mechanically converted into the movement of the valve body, or an actuator that can be controlled remotely, such as an electromagnetic solenoid or a motor. It is also possible to drive the actuator using a float type water level sensor (limit switch). When using a float, the form can be set arbitrarily.

  In general, when the engine is stopped, the throttle valve and intake / exhaust valve are often closed. Therefore, even if the vehicle is immersed in water and the water level rises to the case, the air intake passage of the air cleaner device closes, so that the intake air The system becomes a closed space and air cannot escape. Thereby, even if water tries to enter the case from the drain hole, the water cannot enter due to the resistance of the internal pressure of the case. Or even if water penetrates into the case to some extent, it cannot penetrate as much as the filter element gets wet. Even if water enters the case, the water is drained from the drain hole due to a drop in the water level.

  Therefore, in the present invention, while ensuring the drainage function of the rain water and the washing water by the drain hole, even if the case is submerged, the influence of the water is eliminated and the next start-up can be performed without any trouble. In addition, since the valve body constituting the valve means is disposed inside the air introduction passage, it does not get wet with water, so there is no hindrance to starting and operation, and the valve body is not rusted. It is possible to prevent a decrease in function without any foreign matter biting.

It is a schematic diagram of an internal combustion engine. It is sectional drawing of 1st Embodiment. It is a figure which shows 1st Embodiment, (A) is a side view which shows a motion, (B) is a separate front view. It is a figure which shows 2nd Embodiment, (A) is a vertical side view, (B) is BB sectional drawing of (A), (C) is a partially broken side view. It is a vertical side view of 3rd Embodiment. It is a partially broken side view of 4th Embodiment.

(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 device 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. The surge tank 11 is integrally provided with a throttle valve 13 (may be provided separately). On the other hand, an exhaust manifold 14 is connected to the upper surface of the cylinder head 6, and an exhaust passage 16 including a catalyst case 15 is connected to the exhaust manifold 14.

  The air cleaner device 2 of the present 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 19 is disposed inside the case. Therefore, the inside of the case is divided into a dirty chamber 20 positioned below the filter element 19 and a clean chamber 21 positioned above the filter element 19, and the main body 17 has air opened to the dirty chamber 20. An introduction passage 22 is connected, and the lid 18 is provided with an air outlet 23 opened to the clean chamber 21.

  The main body 17 and the lid 18 are held by clips, but details are omitted. The filter element 19 is held so that its outer peripheral portion is sandwiched between the main body 17 and the lid 18 and cannot be displaced. The air outlet 24 is connected to the intake passage 12 although it is not necessary to mention it. A cylindrical drain hole 24 is provided at the bottom of the main body 17.

  The air introduction passage 22 has a vertical portion 22 a and a lower horizontal portion 22 b continuous to the lower end thereof, and the lower horizontal portion 22 b is connected to the main body 17. And the valve apparatus (valve means) 25 is provided in the lower horizontal part 22b. In FIG. 1, the valve device 25 is schematically indicated by a circle, but the specific structure is indicated in FIGS. This point will be described next.

(2). Structure of the valve device The valve device 25 has a valve body 27 built in the lower horizontal portion 22b of the air introduction passage 22 and a float 28 for closing and rotating the valve body 27 when the water level W28 rises. ing. The valve body 27 is a concentric butterfly system, and a valve shaft 29 is fixed so as to cross the central portion. Both ends of the valve shaft 29 protrude outside the lower horizontal portion 22b, and are rotatably held by the lower horizontal portion 22b by bearings (not shown).

  As clearly shown in FIG. 3, L-shaped driven arms 30 are fixed to both ends of the valve shaft 29. The driven arm 30 has a long portion in a direction orthogonal to the valve shaft 29. When the valve body 27 is open, the longitudinal portion of the driven arm 30 extends downward. Further, in a normal state, the driven arm 30 assumes a downward posture due to its own weight, so that the valve element 27 is biased to a fully open posture.

  While the engine is in operation, suction air is generated in the air introduction passage 22, but the valve body 27 is in a stable posture with the smallest resistance to the suction air in the fully open posture, so the suction air keeps the valve body 27 in the fully open posture. Plays a function. Therefore, the operation of the engine is not adversely affected by arranging the valve body 27.

  A pair of bearings 31 disposed along the direction crossing the lower horizontal portion 22b are fixed to the lower surface of the lower horizontal portion 22b in the air introduction passage 22. A cylindrical body 32 is rotatably held by the bearing 31. The pair of main driving arms 33 are fitted and fixed to the cylindrical body 32 so as to rotate together.

  The main arm 33 has a lower horizontal portion 33a fitted to the cylindrical body 32, an upright portion 33b rising from its tip, and an upper horizontal portion 33c extending from its upper end toward the lower horizontal portion 33b. The horizontal portions 33a and 33c extend in a direction orthogonal to the axis of the lower horizontal portion 22b. The bearing 31 is positioned closer to the main body 17 than the driven arm 30, the rising portion 33 b is inclined toward the driven arm 30, and the upper horizontal portion 33 c is applied to the driven arm 30 from the side opposite to the main body 17. Yes.

  A rod 34 extending downward is fixed to the cylindrical body 32, and a float 28 is attached to the lower end of the rod 34. The rod 34 is always inclined to move away from the main body 17 as it goes downward. For example, the lower limit position of the float 28 is regulated by the rod 34 hitting a stopper 35 provided on the bearing 31. . The lower limit of lowering of the float 28 is located below the lower end of the drain hole 24.

  In FIG. 3A, the upper and lower horizontal portions 33a and 33c of the main arm 33 are depicted as solid circles for the sake of convenience. Half of the horizontal portions 33a and 33c are drawn with dotted lines.

  In the above configuration, when the road is submerged and the water level W rises with the operation stopped, the float 28 starts to rise before the water level W reaches the drain hole 24. The body 27 rotates from the open position to the closed position, the float 28 rises up before the water level W reaches the main body 17, and the lower horizontal portion 22 b of the air introduction passage 22 is fully closed by the valve body 27. .

  Then, since the throttle valve 13 is fully closed when the engine is stopped, the lower horizontal portion 22b of the air introduction passage 22 is fully closed by the valve body 27. As a result, even if the main body 17 is immersed in water, the water level W does not flow into the main body 17 from the drain hole 24.

  Even if some water flows into the main body 17, not only the water is discharged from the drain hole 24 as the water level W decreases, but also the water does not flow until the filter element 19 gets wet. It will not be affected when starting.

  Since the intake valve and the exhaust valve are often closed when the engine is stopped (in the case of an even-numbered cylinder, all the intake valves and the exhaust valves are closed due to structural factors). Even if the valve 13 is slightly opened, the intake passage can be held in a fully closed state. Furthermore, since the end of the exhaust pipe is often lower than the air cleaner, even if the throttle valve, intake valve and exhaust valve are slightly open, the end of the exhaust system is sealed with water so that the intake system is fully closed Can be retained.

  The valve body 27 is held in a fully closed state by the driven arm 30 hitting the stopper 36. Further, since the driven arm 30 is in contact with the stopper 36 so that the main arm 33 is also held unrotatable, the float 28 does not rise even when the water level W rises steadily, and the valve body 27 is kept in the fully closed state. Has been. In the present embodiment, the driven arm 30 and the main drive arm 33 constitute interlocking means for converting the movement of the float 28 into the closing rotation of the valve body 27.

(3) Other Embodiments In the second embodiment shown in FIG. 4, a rectangular valve case 38 is interposed in the lower horizontal portion 22b of the air introduction passage 22 and a valve shaft 29 is provided at one end of the valve case 38. A valve body 27 is attached. That is, the lower horizontal portion 22b is opened and closed by the valve body 27 coming into contact with and separating from one divided end face 22c of the lower horizontal portion 22b.

  Then, as interlocking means for converting the upward movement of the float 28 into the closing rotation of the valve body 27, the driven arm 30 is fixed at both ends of the valve shaft 29, and the main driving arm 33 is moved up and down by the guide cylinder 39 on the valve case 38. The slidable arrangement is provided, and the driven arm 30 is pushed from below by the upper end of the main driving arm 33.

  The main drive arm 33 has a U-shaped upward opening having left and right uprights when viewed from the axial direction of the lower horizontal part 22b, and pushes the driven arm 30 at the upper ends of the left and right uprights. Further, the main arm 30 is closer to the main body 17 than the valve shaft 29, and the driven arm 30 is bent in a square shape when viewed from the axial direction of the valve shaft 29.

  In this embodiment, when the float 28 rises to the upper limit, even if the water level W rises, the float 28 does not rise any further, but the upward pushing force acting on the float 28 becomes stronger as the water level rises. The fully closed state firmly attached to the end face 22c of the horizontal portion 22b is firmly held. This is one of the advantages of this embodiment.

  In the third embodiment shown in FIG. 5, the valve body 27 is a needle type, and a bulging portion 22 d is provided in the lower horizontal portion 22 b in order to ensure the flow of air with the valve body 27 retracted. The valve body 27 is integrally provided with a guide shaft 40 that passes through the axis of the lower horizontal portion 22b, and the guide shaft 30 is slidably held by a guide cylinder 41 built in the lower horizontal portion 22b. The guide cylinder 41 is fixed to the lower horizontal portion 22b by a bridge 41 'that is disposed so as to jump in the circumferential direction.

  This embodiment also has a rod 34 to which a float 28 (not shown) is secured. An upper end portion of the rod 34 enters the inside of the lower horizontal portion 22b, and is rotatably connected to the lower horizontal portion 22b by a flat pin 42 extending in a direction crossing the lower horizontal portion 22b.

  A long hole 43 is formed in a portion of the rod 34 that enters the lower horizontal portion 22 b, and a pin 44 provided on the guide shaft 40 is fitted into the long hole 43. For this reason, when the water level rises, the inclination posture of the rod 34 increases, the valve element 27 advances, and the lower horizontal portion 22b is closed. Also in this embodiment, the higher the water level, the higher the upward pressure on the float 28, and the valve element 27 firmly closes the lower horizontal portion 22b.

  In the fourth embodiment shown in FIG. 6, the gear 45 is fixed to the valve shaft 29, the rack 48 is fixed to the piston 47 provided on the drive cylinder 46, and the rack 48 is engaged with the gear 45. Then, a pressure cylinder 49 having an axial center in the vertical direction is disposed at an arbitrary portion such as the lower horizontal portion 22 b of the air introduction passage 22, and the rod 34 is fixed to the piston 50 fitted in the pressure cylinder 49. The float 28 is attached to this. The upper end portion of the pressure cylinder 49 and the end portion of the drive cylinder 46 are connected by a pipe line 51.

  In this embodiment, when the water level rises, the float 28 rises and the piston 50 of the pressurizing cylinder 49 rises. Then, the air inside the pressurizing cylinder 49 moves to the drive cylinder 46 so that the rack 48 moves forward. As a result, the gear 45 and the valve body 27 rotate. It is also possible to provide a stopper with which the valve body 27 comes into contact in a closed position inside the lower horizontal portion 22b so that the valve body 27 strongly hits the stopper as the water level becomes higher. It is also possible to employ hydraulic pressure instead of air pressure.

  Although not shown, the valve body 27 can be driven by an actuator such as a motor or an electromagnetic solenoid. In this case, it is only necessary to provide a limit switch that is turned on by a float and move the valve body 27 by turning on the limit switch.

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

DESCRIPTION OF SYMBOLS 1 Engine main body 2 Air cleaner apparatus 6 Cylinder head 10 Intake manifold 17 Main body which comprises a case 18 Cover which comprises a case 19 Filter element 20 Dirty chamber 21 Clean chamber 22 Air introduction passage 25 Valve device (valve means)
27 Valve body 28 Float 29 Valve shaft 30 Follower arm constituting interlocking means 32 Bearing 33 Driven arm constituting interlocking means

Claims (1)

The filter element is built in and a drain hole is provided at the bottom of the case to which the air introduction passage is connected,
Even if the vehicle is immersed in water and the water level reaches the case when the engine is stopped in the air introduction passage, the air introduction passage is blocked to prevent water from entering the case from the drain hole or Valve means to suppress is provided,
An air cleaner device for a vehicle-mounted internal combustion engine.

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