JP2014141908A - Intake system of engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an intake system of an engine in which snow hardly accumulates inside between an intake duct and an air cleaner case.SOLUTION: An intake inlet 14 and an intake outlet 15 of an intake duct 7 arranged in an engine room 1 as an inlet of fresh air are coupled each other to form an intake passage 10. The intake passage 10 has a slope 17 inclining in a vehicle longitudinal direction, and a discharge hole 22 for discharging foreign matter entering together with air is formed on a vehicle rear side of the slope 17. A ventilation path 12 is formed outside the discharge hole 22 along the discharge hole 22 to continue to an outer wall of the intake duct 7, the ventilation path having a ventilation inlet 20 for introducing fresh air form the vehicle front and a ventilation outlet 21 for introducing fresh air to the vehicle rear. In the ventilation path 12 formed outside on the vehicle rear side of the slope 17, a flow of fresh air is faster and a pressure thereof is lower than those in the intake passage 10. Snow flowing in the intake passage 10 is discharged from the discharge hole 22 so as to be sucked out by a low pressure associated with the fast flow of the fresh air in the ventilation path 12.

Description

  The present invention relates to an intake device for an engine, and is particularly suitable for an intake device for an engine that takes outside air into an engine mounted in an engine room.

  As such an intake device for an engine, for example, there is one described in Patent Document 1 below. In order to take outside air into the engine, the intake device of this engine has an intake passage that opens to the front of the air cleaner on the vehicle front side of the air cleaner, a connection port to the inlet duct that is connected to the air cleaner, and a downward discharge to the rear of the vehicle. It branches to the hole, and it is configured so that the electrical component is arranged behind the discharge hole in the vehicle. The upper wall in front of the vehicle in the discharge hole is gradually narrowed downward toward the rear of the vehicle, and outside air is discharged downward from the discharge hole in the downward direction of the vehicle, thereby effectively cooling the electrical components.

Japanese Patent No. 485632

  By the way, intake of outside air into the engine is taken in from an intake inlet that opens in front of the vehicle in the intake duct. Therefore, there is a possibility that foreign matters such as snow and rain may enter the intake flow path of the intake duct mixed with the outside air. Among these, when snow enters the air cleaner from the intake duct, there is a possibility that the snow accumulates inside the air cleaner case.

  The present invention has been made paying attention to the above-described problems, and an object of the present invention is to provide an engine intake device in which snow does not easily accumulate in an air cleaner case from an intake duct.

In order to solve the above-described problems, an aspect of the present invention is an engine intake device that takes in outside air into an engine mounted in an engine room, and an intake air that is connected to an intake inlet that opens in front of the vehicle and an air cleaner case of the engine. An intake duct disposed in the engine room as an intake portion for the outside air, and an inclined portion formed in the intake duct and connected to the intake inlet and the intake outlet and inclined with respect to the vehicle longitudinal direction A suction passage provided on the vehicle rear side of the inclined portion of the intake flow path, and a discharge hole for discharging foreign matter that has entered with air, and to be continuous with the outer wall of the intake duct outside the intake flow path And an air guide passage having an air inlet for introducing outside air from the front of the vehicle and an air outlet for guiding outside air to the rear of the vehicle. An intake system for an engine according to claim.
In addition, the exhaust hole is formed on the vehicle rear side of the intake passage within a range when the intake inlet is viewed from the direction of intake air flow.

  Further, the cross-sectional area of the air guide passage is made smaller than the intake cross-sectional area of the intake passage.

  In addition, the cross-sectional area of the air guide passage on the downstream side in the flow direction of the outside air is made smaller than the cross-sectional area on the upstream side.

  Further, the air guide passage is disposed between the intake passage and an exhaust system component of the engine.

  According to one aspect of the invention, an intake air flow path is formed by connecting an intake inlet and an intake outlet of an intake duct disposed in an engine room as an intake portion for outside air. The intake passage has an inclined portion that is inclined with respect to the vehicle front-rear direction, and a discharge hole is formed on the vehicle rear side of the inclined portion for discharging foreign matter that has entered with the air. Outside the exhaust hole, an air guide passage having a wind guide inlet for introducing outside air from the front of the vehicle and a wind guide outlet for guiding outside air to the rear of the vehicle is formed in the discharge hole so as to be continuous with the outer wall of the intake duct. Form along. In the wind guide passage formed outside the inclined portion of the intake passage that is inclined with respect to the vehicle longitudinal direction, the flow of outside air is faster and the pressure is lower than that of the intake passage. Foreign matter such as snow flowing in the intake passage is discharged from the discharge hole so as to be sucked out at a low pressure accompanying the rapid flow of outside air in the air guide passage. For this reason, the intrusion of snow into the air cleaner case is prevented, and the snow does not easily accumulate inside the air cleaner case.

  In addition, a discharge hole is formed on the vehicle rear side of the intake passage within a range when the intake inlet is viewed from the direction in which the intake air flows. Therefore, the snow that has entered the intake passage of the intake duct together with the outside air is discharged from the discharge hole along with the low pressure accompanying the fast outside air flow in the air guide passage.

  In addition, since the cross-sectional area of the wind guide passage is smaller than the cross-sectional area of the intake passage, the flow of outside air in the wind guide path can be further increased.

  In addition, since the cross-sectional area on the downstream side in the flow direction of the outside air in the air guide passage is made smaller than the cross-sectional area on the upstream side, the flow of outside air in the air guide passage can be made even faster.

  In addition, because the wind guide passage is located between the intake flow path and the exhaust system parts of the engine, the wind guide path serves as a heat shield, and the intake flow path is shielded from the heat of the exhaust system parts, and the intake air temperature is reduced. It is possible to prevent the engine output from decreasing by suppressing the increase.

It is a top view in the engine room which shows 1st Embodiment of the intake device of the engine of this invention. It is a top view of the air intake duct of FIG. It is AA sectional drawing of FIG. It is explanatory drawing of an effect | action of the air intake duct of FIG. It is a top view of the intake duct which shows 2nd Embodiment of the intake device of the engine of this invention. It is BB sectional drawing of FIG. It is a top view of the intake duct which shows 3rd Embodiment of the intake device of the engine of this invention. It is a top view of the intake duct which shows 4th Embodiment of the intake device of the engine of this invention. It is CC sectional drawing of FIG.

  Next, a first embodiment of an engine intake device of the present invention will be described with reference to the drawings. FIG. 1 is a plan view of the interior of an engine room to which the engine intake device of the present embodiment is applied. The vehicle of the present embodiment has an engine room 1 in front of the vehicle, and an engine 2 is mounted in the engine room 1. The engine 2 of the present embodiment is an in-line three-cylinder engine, which is a horizontal engine in which a crankshaft is disposed in the vehicle width direction. An air cleaner case 4 is attached to the rear side of the engine 2 via an intake manifold 3, and outside air taken into the air cleaner case 4 is taken into the engine 2. Further, an exhaust pipe (not shown) is connected to the front of the engine 2 through the exhaust manifold 5 so that exhaust gas from the engine 2 is discharged. An upper member 6 that is long in the vehicle width direction is disposed in the upper part of the vehicle front end portion of the engine room 1, and each of both ends of the upper member 6 in the vehicle width direction is supported by left and right side frames (not shown). Yes.

  An intake duct 7 is attached to the upper surface of the upper member 6, and an intake outlet of the intake duct 7 is connected to the air cleaner case 4 via an air cleaner inlet pipe 8. An exhaust manifold 5 is disposed in the vicinity of the rear side of the intake duct 7 in the vehicle. 2 is a plan view of the intake duct 7 and FIG. 3 is a cross-sectional view taken along line AA of FIG. The intake duct 7 forms a suction flow path 10 between the bracket portions 9 and a resin-made flat bracket portion 9 that protrudes on both sides in the vehicle width direction so as to be attached and fixed to the upper surface of the upper member 6. The intake passage portion 11 and an air guide passage portion 13 that forms an air guide passage 12 on the side of the intake passage portion 11 in the vehicle width direction are configured. Both bracket portions 9 are formed with circular through holes 16, and a fastening member is inserted into the through holes 16 to fix both bracket portions 9, that is, the intake duct 7 to the upper member 6.

  The intake passage portion 11 is formed by a tubular tubular resin rear end portion and an irregular pentagonal resin tubular member at the vehicle front end portion so as to be integrated between the bracket portions 9 on both sides in the vehicle width direction. It is fixed to. The irregular pentagonal pipe inlet constituting the intake inlet 14 at the front end of the intake flow passage 11 is a pentagon having a high left end and a low right end shown in FIG. The upper wall is gradually lowered from the center in the vehicle width direction toward the vehicle right side. On the other hand, the pipe outlet constituting the intake outlet 15 at the vehicle rear end of the intake flow passage member 11 is circular as described above, and this circular pipe outlet is connected to the air cleaner inlet pipe 8.

  While the irregular pentagonal intake port 14 described above faces straight toward the front of the vehicle, the circular intake port 15 is inclined toward the right side of the vehicle in FIGS. For this reason, the intake passage 10 connecting the intake inlet 14 and the intake outlet 15 is formed with an inclined portion 17 in which the vehicle rear side is inclined to the right of the vehicle with respect to the vehicle longitudinal direction. The inclined portion 17 is also slightly upward on the vehicle rear side. In the present embodiment, a discharge hole 22 is formed on the vehicle rear side of the inclined portion 17 of the intake flow path portion 11 constituting the intake flow path 10 to discharge foreign matters such as snow taken together with outside air. The discharge hole 22 of the present embodiment is formed along the intake direction of the intake passage 10 and within the range when the intake inlet 14 is viewed from the direction of intake air flow. Further, the discharge hole 22 that is long along the intake direction is formed with the inclined portion 17 of the intake flow passage portion 11 slightly upward on the vehicle rear side.

  The air guide passage 12 by the air guide passage portion 13 is formed along the discharge hole 22 so as to be continuous with the intake duct 7, specifically, the outer wall of the intake passage portion 11, outside the intake passage 10. . The air guide passage portion 13 is formed at the end of the air guide plate 18 in the protruding direction of the resin air guide plate 18 projecting from the outer wall of the intake flow passage portion 11 along the exhaust hole 22 below the exhaust hole 22. The air guide plate 18 includes a resin side wall 19 provided vertically upward, and is integrally formed with the intake flow path portion 11. As a result, the air guide passage 12 formed by the air guide passage portion 13 has a wind guide inlet 20 that introduces outside air from the front of the vehicle and a wind guide outlet 21 that guides outside air to the rear of the vehicle. The air guide passage portion 13 exists between the intake duct 7 and the exhaust manifold 5.

  In this way, the exhaust hole 22 is formed on the vehicle rear side of the inclined portion 17 of the intake passage 10, and the air guide passage 12 along the exhaust hole 22 is formed outside the intake passage 10 so as to be continuous with the outer wall of the intake duct 7. When formed, the speed of the outside air passing through the air guide passage 12 becomes faster than the speed of the air flowing through the intake passage 10. Since the outside air speed of the air guide passage 12 is higher than the air speed of the intake passage 10, the pressure of the air guide passage 12 is lower than the pressure of the intake passage 10. As shown in FIG. 4, the snow that has entered the intake passage 10 together with the outside air is about to flow out from the discharge hole 22 formed on the vehicle rear side of the inclined portion 17, but is further sucked by the low pressure of the air guide passage 12. And is discharged from the air guide outlet 21 of the air guide passage 12 to the rear of the vehicle. Therefore, snow does not accumulate in the air cleaner case 4. Further, since the air guide passage portion 13 constituting the air guide passage 12 exists between the intake duct 7 and the exhaust manifold 5, the air guide passage portion 13 including the air guide passage 12 serves as a heat shield plate. None, heat from the exhaust manifold 5 is shielded. Therefore, it is possible to suppress an increase in intake air temperature in the intake duct 7 and keep the intake air temperature low. As a result, the output performance of the engine 2 can be ensured.

  Thus, in the engine intake device of the present embodiment, the intake passage 10 is formed by connecting the intake inlet 14 and the intake outlet 15 of the intake duct 7 disposed in the engine room 1 as an outside air intake portion. The intake passage 10 has an inclined portion 17 that is inclined with respect to the vehicle front-rear direction, and a discharge hole 22 that discharges foreign matter that has entered together with air is formed on the vehicle rear side of the inclined portion 17. Outside the discharge hole 22, a wind guide passage 12 having a wind guide inlet 20 for introducing outside air from the front of the vehicle and a wind guide outlet 21 for guiding outside air to the rear of the vehicle is continuous with the outer wall of the intake duct 7. Thus, it is formed along the discharge hole 22. In the air guide passage 12 formed outside the inclined portion 17 of the intake passage 10 that is inclined with respect to the vehicle longitudinal direction, the flow of outside air is faster and the pressure is lower than that of the intake passage 10. Foreign matter such as snow flowing through the intake passage 10 is discharged from the discharge hole 22 so as to be sucked out at a low pressure accompanying the rapid flow of outside air in the air guide passage 12. For this reason, the intrusion of snow into the air cleaner case 4 is prevented, and the snow hardly accumulates inside the air cleaner case 4.

  Further, a discharge hole 22 is formed on the vehicle rear side of the intake passage 10 within a range when the intake inlet 14 is viewed from the direction in which the intake air flows. Therefore, the snow that has entered the intake flow path 10 of the intake duct 7 together with the outside air is discharged from the discharge hole 22 along with the low pressure accompanying the quick flow of the outside air in the air guide passage 12 along with the intake air flow.

  Next, a second embodiment of the engine intake device of the present invention will be described with reference to FIGS. FIG. 5 is a plan view of the intake duct of the present embodiment, and FIG. 6 is a cross-sectional view taken along the line BB of FIG. The structure in the engine room of the engine intake device of the present embodiment is the same as that of FIG. 1 of the first embodiment. The intake duct used in the engine intake device of the present embodiment is similar to the intake duct of the first embodiment. Therefore, the same components are denoted by the same reference numerals, and detailed description thereof is omitted. In the intake duct 7 of the present embodiment, the bracket side wall 23 is connected to the projecting direction end of the bracket portion 9 on the right side of the drawing in succession to the side wall 19 of the air guide passage portion 13 of the intake duct 7 of the first embodiment. The bracket portion 9 is provided vertically upward. As a result, the air guide passage 12 is extended to the vehicle front end portion of the right bracket portion 9 in the drawing, and the vehicle front end portion of the right bracket portion 9 in the drawing becomes the air guide inlet 20.

  In the present embodiment, the bracket side wall 23 is erected at the protruding end portion of the bracket portion 9 as described above, whereby the air guide passage 12 is extended to the vehicle front end portion of the bracket portion 9. Here, the cross sectional area of the air guide passage 12 at the front end of the bracket portion 9 (assuming that the upper side of the air guide passage 12 is covered with the upper wall) is smaller than the cross sectional area of the intake passage 10. . Thus, by making the air guide cross-sectional area of the air guide passage 12 smaller than the air intake cross-sectional area of the air intake passage 10, the flow rate of the outside air in the air guide passage 12 is made higher than the air flow velocity in the air intake passage 10. Can be surely fast. As a result, the pressure in the air guide passage 12 decreases, and the snow in the intake passage 10 can be reliably sucked out.

  As described above, in the engine intake device of the present embodiment, the air guide cross-sectional area of the air guide passage 12 is made smaller than the air intake cross-sectional area of the intake passage 10, so that the outside air flow in the air guide passage 12 can be made even faster. it can. As a result, the snow in the intake passage 10 can be reliably sucked out, and the snow can be prevented from accumulating in the air cleaner case 4.

  Next, a third embodiment of the engine intake device of the present invention will be described with reference to FIG. FIG. 7 is a plan view of the intake duct of the present embodiment. The structure in the engine room of the engine intake device of the present embodiment is the same as that of FIG. 1 of the first embodiment. Further, the intake duct used in the engine intake device of the present embodiment is similar to the intake duct of the second embodiment. Therefore, the same components are denoted by the same reference numerals, and detailed description thereof is omitted. In the intake duct 7 of the present embodiment, the bracket side wall 23 is erected at the protruding end portion of the right bracket portion 9 in the same manner as in the second embodiment to extend the air guide passage 12 to the vehicle front end portion. At the same time, the width in the vehicle width direction of the air guide plate 18 of the air guide passage portion 13 of the intake duct 7 of the second embodiment is gradually narrowed toward the vehicle rear end. As a result, the cross-sectional area of the air guide passage 12 (assuming that the upper side of the air guide path 12 is covered with the upper wall) is smaller in cross-sectional area on the downstream side in the flow direction of the outside air than on the upstream side. As described above, when the cross-sectional area of the air guide through which the outside air flows is reduced, the flow velocity in the air guide passage 12 is gradually increased. Accordingly, the flow rate of the outside air in the air guide passage 12 of the present embodiment is faster than the flow speed of the outside air in the air guide passage 12 of the second embodiment. As a result, the flow rate of the outside air in the air guide passage 12 can be surely made higher than the flow rate of the air in the intake passage 10. As a result, the pressure in the air guide passage 12 is further reduced, and the snow in the intake passage 10 can be reliably sucked out.

  Thus, in the engine intake device of the present embodiment, since the cross-sectional area on the downstream side in the flow direction of the outside air of the air guide passage 12 is made smaller than the cross-sectional area on the upstream side, the flow of the outside air in the air guide passage 12 is made even faster. be able to. As a result, the snow in the intake passage 10 can be reliably sucked out, and the snow can be prevented from accumulating in the air cleaner case 4.

  Next, a fourth embodiment of the engine intake device of the present invention will be described with reference to FIGS. FIG. 8 is a plan view of the intake duct of the present embodiment, and FIG. 9 is a cross-sectional view taken along the line CC in FIG. The structure in the engine room of the engine intake device of the present embodiment is the same as that of FIG. 1 of the first embodiment. Further, the intake duct used in the engine intake device of the present embodiment is similar to the intake duct of the second embodiment. Therefore, the same components are denoted by the same reference numerals, and detailed description thereof is omitted. In the intake duct 7 of this embodiment, the bracket side wall 23 is erected to the vehicle rear side of the through hole 16 at the protruding direction end portion of the bracket portion 9 on the right side of the drawing as in the second embodiment, and the air guide passage 12 is provided. Was extended to the front of the vehicle, and the upper portion of the wind guide passage 12 formed in this way was covered with the upper wall 24. As a result, the air guide passage 12 is extended to the vehicle rear side of the through hole 16 of the bracket portion 9 on the right side of the drawing, and the upper portion is covered with the upper wall 24.

  Thus, by covering the upper part of the air guide passage 12 with the upper wall 24, the flow of the outside air in the air guide passage 12 is converged toward the air guide outlet 21 at the rear of the vehicle, and the outside air having a low pressure and a high speed is collected. The snow in the intake passage 10 can be reliably sucked out from the discharge hole 22 by the flow. As a result, it is possible to prevent snow from accumulating in the air cleaner case 4.

1 is an engine room 2 is an engine 3 is an intake manifold 4 is an air cleaner case 5 is an exhaust manifold 6 is an upper member 7 is an intake duct 8 is an air cleaner inlet pipe 9 is a bracket part 10 is an intake flow path 11 is an intake flow path 12 is a wind guide The passage 13 is a wind guide passage portion 14 is an intake inlet 15 is an intake outlet 16 is a through hole 17 is an inclined portion 18 is a wind guide plate 19 is a side wall 20 is a wind guide inlet 21 is a wind guide outlet 22 is a discharge hole 23 is a bracket side wall 24 Is the upper wall

Claims (5)

In the intake system of the engine that takes outside air into the engine mounted in the engine room,
An intake duct that has an intake inlet that opens to the front of the vehicle and an intake outlet that is connected to an air cleaner case of the engine;
An intake passage formed in the intake duct and having an inclined portion that is inclined with respect to the vehicle longitudinal direction by connecting the intake inlet and the intake outlet;
A discharge hole that is provided on the vehicle rear side of the inclined portion of the intake flow path and discharges foreign matter that has entered with air;
An air guide that is formed along the discharge hole so as to be continuous with the outer wall of the air intake duct outside the air intake flow path, and has a wind guide inlet that introduces the outside air from the front of the vehicle and a wind guide outlet that guides the outside air to the rear of the vehicle. An air intake device for an engine comprising a wind passage.   2. The engine intake device according to claim 1, wherein the exhaust hole is formed on a vehicle rear side of the intake flow path within a range when the intake inlet is viewed from a flow direction of intake air.   The engine intake device according to claim 1 or 2, wherein an air guide cross-sectional area of the air guide passage is smaller than an air intake cross-sectional area of the intake passage.   The engine air intake device according to any one of claims 1 to 3, wherein the air guide passage has a cross-sectional area on the downstream side in the flow direction of the outside air that is smaller than a cross-sectional area on the upstream side.   The engine intake device according to any one of claims 1 to 4, wherein the air guide passage is disposed between the intake passage and an exhaust system component of the engine.

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