JP2017013680A - Intake system for engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an intake system for an engine that can prevent clogging of an air cleaner and can prevent air warmed by the engine from being sucked to the engine via a foreign matter discharge port so as to improve engine output.SOLUTION: In an intake system 30, a foreign matter discharge port 17 of an air intake duct 15 is opened on a bottom wall of the air intake duct 15 between an air intake port 16 and a connection port. An air passage 15A includes a plate-shaped guide portion 40 that is extended from the air intake port 16 to the upper side of the foreign matter discharge port 17 and that has a downstream portion bent toward a vehicle lower direction relative to an upstream portion so as to guide part of the air flowing in the air passage 15A to the foreign matter discharge port 17.SELECTED DRAWING: Figure 6

Description

  The present invention relates to an engine intake device, and more particularly, to an engine intake device that removes foreign matter from air and introduces it into an air cleaner.

  In vehicles such as automobiles, traveling wind containing foreign matter such as snow and dust may enter the air cleaner through the air intake duct and cause clogging of the air cleaner. is there.

  In this type of conventional intake device, an air intake (intake port) is formed at the front end of the intake duct, and a foreign object discharge port for discharging foreign matters contained in air introduced from the air intake is provided at the rear of the intake duct. There is known one in which an intake hose (inlet duct) that is formed at an end and introduces air into an air cleaner is connected to a position between an air intake port and a foreign matter discharge port (see Patent Document 1). Moreover, the thing of patent document 1 has arrange | positioned the foreign material discharge port behind the radiator fan shroud.

JP 2007-308000 A

  However, in the conventional engine intake system, the foreign matter discharge port is located behind the radiator fan shroud and close to the engine, so that the warm air sent from the radiator fan shroud and the engine There is a possibility that warmed warm air is introduced into the engine through the foreign matter discharge port, and the engine output is reduced.

  In addition, in the conventional engine intake system, since the intake hose is connected in front of the foreign matter discharge port, the air introduced into the intake duct from the air intake port is introduced into the air cleaner along with the foreign matter via the intake hose. The air cleaner may be clogged.

  The present invention has been made paying attention to the above-described problems, and prevents air cleaners from becoming clogged, and allows air warmed by the engine to be sucked into the engine through a foreign matter discharge port. An object of the present invention is to provide an engine intake device that can improve engine output by preventing the engine.

  The present invention includes an air intake opening that opens at a front portion of a vehicle, a connection port that is provided rearward of the air intake, and a foreign matter discharge port that discharges foreign matters contained in air taken from the air intake. An air intake duct having an air passage formed therein, an air cleaner for purifying air, and an air intake hose for connecting the connection port and the air cleaner, The foreign matter discharge port is a bottom wall of the intake duct and opens between the air intake port and the connection port, and extends to the air passage from the air intake port to above the foreign material discharge port. In addition, a plate-like guide portion whose downstream portion curves downward with respect to the upstream portion thereof is provided so as to guide a part of the air flowing through the air passage to the foreign matter discharge port.

  According to the present invention, foreign matter contained in the air introduced from the air intake port can be guided to the foreign matter discharge port by the guide portion and discharged from the foreign matter discharge port. Therefore, only air that does not contain foreign matter is sucked from the connection port. It can be introduced into the air cleaner via a hose.

  In addition, by opening the foreign matter discharge port between the air intake port and the connection port, the foreign matter discharge port is arranged at a position farther from the engine than the connection port. Therefore, it is possible to prevent the air heated by the air from flowing into the intake duct from the foreign matter discharge port.

  As a result, the air cleaner can be prevented from being clogged, and air warmed by the engine can be prevented from being taken into the engine through the foreign matter discharge port, thereby improving the engine output.

FIG. 1 is a diagram showing an embodiment of an engine intake device of the present invention, and is a plan view of a front portion of a vehicle. FIG. 2 is a view showing an embodiment of the engine intake device of the present invention, and is a side view of the front portion of the vehicle. FIG. 3 is a view showing an embodiment of the engine intake device of the present invention, and is a front view of the front portion of the vehicle. FIG. 4 is a view showing an embodiment of the engine intake device of the present invention, and is a plan view of the intake duct. FIG. 5 is a view showing an embodiment of the engine intake device of the present invention, and is a cross-sectional view of the intake duct of FIG. 6 is a view showing an embodiment of an intake device for an engine according to the present invention, and is a cross-sectional view taken along the line XX of the intake duct of FIG. 4 when the vehicle is running. FIG. 7 is a view showing an embodiment of an intake device for an engine of the present invention, and is a cross-sectional view taken along the line XX of the intake duct of FIG. 4 when the vehicle is traveling at a low speed and when the vehicle is stopped. FIG. 8 is a diagram showing an embodiment of the engine intake device of the present invention, and is a bottom view of the front portion of the vehicle.

  Embodiments of an intake device for an engine according to the present invention will be described below with reference to the drawings. FIGS. 1-8 is a figure which shows the intake apparatus of the engine of one Embodiment which concerns on this invention. First, the configuration will be described. 1 to 8, the left and right front and rear directions represent the left and right front and rear directions of the vehicle as viewed from the driver's seat.

  1, 2, and 3, a vehicle 1 such as an automobile includes a vehicle body 2, and the vehicle body 2 includes a dash panel 3 and an engine room 4 on the front side of the vehicle 1 and a vehicle compartment on the rear side of the vehicle 1. 5 is partitioned. A front portion of the dash panel 3 in the vehicle 1 constitutes a front portion of the vehicle 1. Here, the expressions “front” and “rear” indicate the front-rear direction front and the front-rear direction rear of the vehicle 1.

  An engine 6 is provided in the engine room 4. The engine 6 includes a cylinder block 7, a cylinder head 8 provided at the upper part of the cylinder block 7, and an oil pan 9 provided at the lower part of the cylinder block 7.

  The cylinder block 7 houses a piston (not shown) accommodated in a cylinder (not shown) so as to be movable up and down, a crankshaft (not shown) that converts the vertical movement of the piston into a rotational motion, and the like. The crankshaft extends in the width direction of the vehicle 1.

  A transmission 10 is attached to the right end of the cylinder block 7 in the width direction of the vehicle 1 (hereinafter, the width direction of the vehicle 1 is referred to as the vehicle width direction). The transmission 10 changes the number of rotations of the crankshaft and is not shown. Power is transmitted to the drive wheels.

  An upper member 11 is provided in the upper part of the front side of the engine room 4. The engine 6 is provided behind the upper member 11 in the engine room 4. A radiator 12 is provided in front of the engine 6. An upper end portion of the radiator 12 is fixed to the upper member 11. The radiator 12 cools the cooling water by exchanging heat with air (running wind).

  The radiator 12 is provided with an inlet pipe and an outlet pipe (not shown). The inlet pipe introduces high-temperature cooling water led out from the cylinder block 7 into the radiator 12.

  The radiator 12 exchanges heat between the cooling water introduced from the inlet pipe and the traveling wind. The cooling water heat-exchanged with the traveling wind is introduced from the radiator 12 to the outlet pipe.

  The outlet pipe introduces low-temperature cooling water cooled by the radiator 12 into the cylinder block 7 and the cylinder head 8. Thereby, each part of the engine 6 is cooled by the cooling water.

  An intake duct 15 is provided on the right side of the radiator 12 and in front of the engine 6, and the intake duct 15 is fixed to the upper member 11.

  An intake manifold 21 is provided at the rear of the cylinder head 8, and the intake manifold 21 introduces air introduced from the air cleaner 20 into the cylinder through an intake port (not shown) formed in the cylinder head 8.

  An exhaust manifold 22 is provided integrally with the cylinder head 8 at the front portion of the cylinder head 8, and the exhaust manifold 22 passes exhaust gas burned in the cylinder through an exhaust port (not shown) formed in the cylinder head 8. Discharge.

  A catalytic converter 23 is connected to the exhaust manifold 22, and the catalytic converter 23 purifies the exhaust gas discharged from the exhaust manifold 22 and discharges it to an exhaust pipe (not shown).

  4 and 5, the intake duct 15 is opened at the front portion of the vehicle 1 to take in air from the front of the vehicle 1, and a connection port 18 provided behind the air intake 16. And a foreign matter discharge port 17 for discharging foreign matters such as snow and dust contained in the air taken in from the air intake port 16.

  An air passage 15 </ b> A is formed inside the intake duct 15, and the air passage 15 </ b> A communicates with the air intake port 16, the foreign matter discharge port 17 and the connection port 18.

  A front end portion of the intake hose 19 is attached to the connection port 18 of the intake duct 15, and the air passage 15 </ b> A inside the intake duct 15 communicates with the air passage 19 </ b> A inside the intake hose 19 through the connection port 18. ing.

  The rear end of the intake hose 19 is attached to an air cleaner 20, and traveling air is introduced into the air cleaner 20 through an air passage 19 </ b> A of the intake hose 19. The air cleaner 20 is located behind the intake duct 15, and the air cleaner 20 is attached to the upper part on the rear side of the cylinder head 8.

  A filter element (not shown) is built in the air cleaner 20, and the air cleaner 20 purifies the traveling wind introduced from the intake duct 15 through the intake hose 19 by the filter element.

  The intake hose 19 is made of an elastic member such as rubber, and a bellows portion 19B is formed in the front portion of the intake hose 19. The intake hose 19 is formed to be deformable in the bellows portion 19B.

  6, 7, and 8, the foreign matter discharge port 17 is a bottom wall 15 </ b> B of the intake duct 15 and opens between the air intake port 16 and the connection port 18. A plate-shaped guide portion 40 is provided in the air passage 15 </ b> A inside the intake duct 15.

  The guide portion 40 extends from the air intake port 16 above the foreign matter discharge port 17 and has a downstream portion with respect to its upstream portion so as to guide part of the air flowing through the air passage 15A to the foreign matter discharge port 17. The vehicle is curved downward.

  The guide part 40 includes a first guide part 41 and a second guide part 42. The first guide portion 41 is curved in an arc shape from the ceiling wall 15 </ b> C of the intake duct 15 at the air intake port 16 toward the foreign substance discharge port 17. The second guide portion 42 is curved toward the foreign substance discharge port 17 below the first guide portion 41.

  Here, one second guide portion 42 is provided in the present embodiment, but two or more second guide portions 42 may be provided. That is, at least one second guide portion 42 is provided.

  The first guide portion 41 and the second guide portion 42 have a projection shape 47 (see FIGS. 6 and 7) in which the first guide portion 41 and the second guide portion 42 are projected in the extending direction of the intake duct 15. It is curved to coincide with the 16 cross-sectional shapes 48 (see FIGS. 6 and 7).

  The first guide portion 41 has an upper end portion 41A and a lower end portion 41B. The second guide part 42 has an upper end part 42A and a lower end part 42B. In the vertical direction of the vehicle 1, the lower end portion 41 </ b> B of the first guide portion 41 extends to the position of the upper end portion 42 </ b> A of the second guide portion 42, and the lower end portion 42 </ b> B of the second guide portion 42 is the lower end portion 16 </ b> B of the air intake port 16. It extends to the position. Here, in FIGS. 6 and 7, the position of the lower end portion 41B of the first guide portion 41 and the position of the upper end portion 42A of the second guide portion 42 in the height direction are indicated by P1. Moreover, the position of the lower end part 42B of the 2nd guide part 42 in the height direction and the position of the lower end part 16B of the air intake port 16 are shown by P2.

  The intake duct 15 is provided with a step portion 15F, and the step portion 15F is adjacent to the rear of the air intake port 16 and below the lower end portion 16B of the air intake port 16. The foreign matter discharge port 17 is formed in the step portion 15F.

  When the first extension line 41E extending the downstream part (lower end part 41B) of the first guide part 41 and the second extension line 42E extending the downstream part (lower end part 42B) of the second guide part 42 are set, The 1st guide part 41 and the 2nd guide part 42 are formed so that the 1st extension line 41E and the 2nd extension line 42E may become parallel.

  Further, when the intake duct 15 is viewed from the vehicle width direction, the front end portion 17A of the foreign matter discharge port 17 is formed to be positioned in front of the second extension line 42E, and the rear end portion 17B of the foreign matter discharge port 17 is formed. It forms so that it may be located behind the 1st extension line 41E.

  6 and 7, the position of the front end portion of the vehicle 1 and the front end portion 15G of the intake duct 15 when the intake duct 15 is viewed from the vehicle width direction is indicated by P3. Further, an intermediate position between the front end portion 6A of the engine 6 and the front end portion 15G of the intake duct 15 is indicated by P4. Further, the position of the front end 6A of the engine 6 is indicated by P5.

  Further, when the intake duct 15 is viewed from the vehicle width direction, the position of the front end portion 17A of the foreign matter discharge port 17 is indicated by P6, the position of the rear end portion 17B of the foreign matter discharge port 17 is indicated by P7, and the radiator fan shroud 44 The position is indicated by P8.

  A grill opening 43 for introducing air from the outside is formed at the front end of the vehicle 1. The grill opening 43 is disposed above the front bumper 46 and opens, for example, in a lattice shape in the front-rear direction of the vehicle 1. Arranged behind the grill opening 43 are a radiator 12 and a radiator fan shroud 44 attached to the rear surface of the radiator 12.

  The radiator fan shroud 44 covers an electric fan (not shown) provided behind the radiator 12 from the outer peripheral direction. The radiator fan shroud 44 suppresses the suction of air from the outer peripheral direction into the electric fan so that the electric fan efficiently passes air from the front side to the rear side of the radiator 12.

  Further, the foreign matter discharge port 17 is displaced in the air intake 16 side from the intermediate position P4 between the front end portion 6A of the engine 6 and the front end portion 15G of the intake duct 15 in the front-rear direction of the vehicle 1, and The rear end portion 17 </ b> B of the foreign matter discharge port 17 is disposed in front of the radiator fan shroud 44.

  4 and 8, the intake duct 15 includes an upstream intake duct portion 15U extending from the air intake port 16 to the foreign matter discharge port 17 in the extending direction of the air passage 15A, and an upstream intake duct portion 15U. A downstream side intake duct portion 15 </ b> D extending to the hose 19.

  Further, an enlarged portion 15E is formed in the downstream side intake duct portion 15D, and the enlarged portion 15E has a size in the vehicle width direction and a cross-sectional area of the flow passage that are enlarged toward the air intake port 16.

  As a result, the enlarged portion 15E is formed in the downstream side intake duct portion 15D, so that the dimension L1 in the vehicle width direction of the upstream side intake duct portion 15U is equal to the vehicle width direction of the downstream side intake duct portion 15D, as shown in FIG. And the flow passage cross-sectional area S1 of the upstream intake duct portion 15U is larger than the flow passage cross-sectional area S2 of the downstream intake duct portion 15D. Here, the intake duct 15, the intake hose 19 and the air cleaner 20 of the present embodiment constitute the intake device 30 of the present invention.

  Next, the operation will be described. According to the intake device 30 of the present embodiment, the foreign matter discharge port 17 is a bottom wall of the intake duct 15 and opens between the air intake port 16 and the connection port 18. Further, the air passage 15A extends from the air intake port 16 to above the foreign matter discharge port 17 and is downstream of the upstream portion so as to guide part of the air flowing through the air passage 15A to the foreign matter discharge port 17. A plate-like guide portion 40 whose portion is curved downward is provided.

  Therefore, when the vehicle travels, as indicated by arrows 31, 32, and 33 in FIG. 6, a part of the air flow 31 introduced into the intake duct 15 by the traveling wind is guided by the guide portion 40 and the foreign matter discharge port 17. The air flow 33 is guided to the air hose 19 and the remaining air flow 32 does not include foreign matter introduced into the intake hose 19. As a result, foreign matter contained in the air introduced from the air intake port 16 can be guided to the foreign matter discharge port 17 by the guide portion 40 and discharged from the foreign matter discharge port 17, so that only air that does not contain foreign matter is connected to the connection port 18. To the air cleaner 20 through the intake hose 19.

  Further, when the vehicle is low speed or stopped, as shown by an arrow 34 in FIG. 7, an air flow 34 introduced into the intake duct 15 from below and in front of the foreign matter discharge port 17 through the foreign matter discharge port 17 is generated. Occur. Thereby, since the foreign matter discharge port 17 is opened between the air intake port 16 and the connection port 18, the foreign matter discharge port 17 is disposed at a position farther from the engine 6 than the connection port 18. It is possible to prevent the air warmed by the engine 6 from flowing into the intake duct 15 from the foreign matter discharge port 17 when traveling at a low speed or stopping.

  As a result, the air cleaner 20 can be prevented from being clogged, and the air warmed by the engine 6 can be prevented from being sucked into the engine 6 through the foreign matter discharge port 17, thereby improving the engine output.

  Further, according to the intake device 30 of the present embodiment, the guide portion 40 includes the first guide portion 41 that is curved in an arc shape from the ceiling wall 15C of the intake duct 15 at the air intake port 16 toward the foreign matter discharge port 17. And at least one second guide portion 42 that curves toward the foreign matter discharge port 17 below the first guide portion 41.

  Further, the first guide portion 41 and the second guide portion 42 are projected so that the projection shape 47 obtained by projecting the first guide portion 41 and the second guide portion 42 in the extending direction of the intake duct 15 matches the cross-sectional shape 48 of the air intake port 16. The guide part 42 was curved.

  Accordingly, as shown in FIGS. 6 and 7, the guide portion 40 is constituted by the first guide portion 41 and the second guide portion 42, and the first guide portion 41 and the second guide portion 42 are extended from the intake duct 15. Since the first guide portion 41 and the second guide portion 42 are curved so that the projected shape 47 projected in the present direction matches the cross-sectional shape 48 of the air intake port 16, as shown in FIG. When 16 is viewed from the front of the vehicle 1, the rear of the air intake port 16 can be covered with the first guide portion 41 and the second guide portion 42.

  For this reason, the air passage 15A is not completely blocked by the first guide portion 41 and the second guide portion 42, and the air that has passed through the air intake port 16 is reliably supplied to the first guide portion 41 and the second guide portion 42. Can be applied.

  In addition, by configuring the guide portion 40 with the first guide portion 41 and the second guide portion 42, a part of air is introduced into the connection port 18 below the lower end portion 41 </ b> B of the first guide portion 41. An enlarged space 45 can be formed.

  Accordingly, air that is separated from the first guide portion 41 and the second guide portion 42 and does not contain foreign matter is introduced into the intake hose 19 through the space 45 formed below the first guide portion 41, and the foreign matter is introduced. Can be smoothly guided along the first guide portion 41 and the second guide portion 42 to the foreign matter discharge port 17.

  As a result, the foreign matter can be reliably guided to the foreign matter discharge port 17 along the first guide portion 41, and a part of the air flowing along the first guide portion 41 can be partly removed from the lower end portion 41 </ b> B of the first guide portion 41. Since the air can be introduced into the engine 6 via the space 45 formed below, a large amount of air can be introduced into the intake hose 19 to improve the engine output.

  Further, according to the intake device 30 of the present embodiment, the guide portion 40 includes the first guide portion 41 that is curved in an arc shape from the ceiling wall 15C of the intake duct 15 at the air intake port 16 toward the foreign matter discharge port 17. The second guide portion 42 is curved below the first guide portion 41 toward the foreign substance discharge port 17.

  In the vertical direction of the vehicle 1, the lower end portion 41 </ b> B of the first guide portion 41 is extended to the position of the upper end portion 42 </ b> A of the second guide portion 42, and the lower end portion 42 </ b> B of the second guide portion 42 is the lower end of the air intake port 16. It extended to the position of the part 16B.

  Thereby, in the up-down direction of the vehicle 1, the lower end portion 41 </ b> B of the first guide portion 41 is extended to the position of the upper end portion 42 </ b> A of the second guide portion 42, and the lower end portion 42 </ b> B of the second guide portion 42 is extended to the air intake port 16. Since it extends to the position of the lower end portion 16B, when the air intake 16 is viewed from the front of the vehicle 1, the rear of the air intake 16 is covered with the first guide portion 41 and the second guide portion 42. be able to.

  For this reason, the air passage 15A is not completely blocked by the first guide portion 41 and the second guide portion 42, and the air that has passed through the air intake port 16 is reliably supplied to the first guide portion 41 and the second guide portion 42. Can be applied.

  In addition, by configuring the guide portion 40 with the first guide portion 41 and the second guide portion 42, a part of air is introduced into the connection port 18 below the lower end portion 41 </ b> B of the first guide portion 41. An enlarged space 45 can be formed.

  Accordingly, air that is separated from the first guide portion 41 and the second guide portion 42 and does not contain foreign matter is introduced into the intake hose 19 through the space 45 formed below the first guide portion 41, and the foreign matter is introduced. Can be smoothly guided along the first guide portion 41 and the second guide portion 42 to the foreign matter discharge port 17.

  As a result, the foreign matter can be reliably guided to the foreign matter discharge port 17 along the first guide portion 41, and a part of the air flowing along the first guide portion 41 can be partly removed from the lower end portion 41 </ b> B of the first guide portion 41. Since the air can be introduced into the engine 6 via the space 45 formed below, a large amount of air can be introduced into the intake hose 19 to improve the engine output.

  Further, according to the intake device 30 of the present embodiment, the intake duct 15 has the step portion 15F adjacent to the rear of the air intake port 16 and positioned below the lower end portion 16B of the air intake port 16. doing. And the foreign material discharge port 17 was formed in the level | step-difference part 15F.

  Thereby, since the space 45 expanded below the first guide portion 41 can be greatly formed by the step portion 15F, more air that does not contain foreign matter can be introduced into the intake hose 19 to improve the engine output.

  Further, according to the intake device 30 of the present embodiment, the first extension line 41E extending the downstream part of the first guide part 41 and the second extension line 42E extending the downstream part of the second guide part 42 are provided. The first guide part 41 and the second guide part 42 are formed so as to be parallel to each other.

  Further, when the intake duct 15 is viewed from the vehicle width direction, the front end portion 17A of the foreign matter discharge port 17 is formed to be positioned in front of the second extension line 42E, and the rear end portion 17B of the foreign matter discharge port 17 is formed. It formed so that it might be located behind the 1st extension line 41E.

  With this configuration, foreign matters flowing along the first guide portion 41 and the second guide portion 42 can be reliably discharged from the foreign matter discharge port 17.

  As a result, foreign matter can be prevented from being introduced into the air cleaner 20 through the intake hose 19, and clogging of the air cleaner 20 can be reliably prevented.

  Further, according to the intake device 30 of the present embodiment, the grill opening 43 for introducing air from the outside is formed in the front end 1 </ b> A of the vehicle 1, and the radiator 12 and the radiator 12 are disposed behind the grill opening 43. A radiator fan shroud 44 attached to the rear surface is arranged.

  In the front-rear direction of the vehicle 1, the foreign matter discharge port 17 is displaced to the air intake port 16 side with respect to the intermediate position between the front end portion 6 </ b> A of the engine 6 and the front end portion 15 </ b> G of the intake duct 15. The rear end 17 </ b> B of 17 is disposed in front of the radiator fan shroud 44.

  With this configuration, the foreign matter discharge port 17 can be disposed close to the grill opening 43 through which low-temperature air is introduced, and the foreign matter discharge port 17 can be moved away from the engine 6 in the front-rear direction of the vehicle 1.

  Thereby, it is possible to prevent the air warmed by the engine 6 from flowing into the intake duct 15 from the foreign matter discharge port 17 when the vehicle 1 travels at a low speed or stops.

  Further, since the rear end portion 17B of the foreign matter discharge port 17 is positioned in front of the radiator fan shroud 44, the warm air blown rearward from the radiator fan shroud 44 through the radiator 12 is introduced into the foreign matter discharge port 17. Can be suppressed, and a decrease in engine output can be prevented.

  Further, since the foreign matter discharge port 17 can be arranged close to the grill opening 43, a part of the low-temperature air that has passed through the grill opening 43 and flows into the vicinity of the front end 1A of the vehicle 1 when the vehicle 1 is stopped. The foreign matter discharge port 17 can be introduced into the intake hose 19 to improve the engine output.

  Further, according to the intake device 30 of the present embodiment, the intake duct 15 includes the upstream intake duct portion 15U extending from the air intake port 16 to the foreign matter discharge port 17 in the extending direction of the air passage 15A, and the upstream intake duct. And a downstream side intake duct portion 15D extending to the intake hose 19 continuously from the portion 15U.

  Further, the dimension L1 in the vehicle width direction of the upstream intake duct portion 15U is larger than the dimension L2 in the vehicle width direction of the downstream intake duct portion 15D, and the flow passage cross-sectional area S1 of the upstream intake duct portion 15U is downstream intake. An enlarged portion 15E is formed in the downstream side intake duct portion 15D so as to be larger than the flow path cross-sectional area S2 of the duct portion 15D.

  With this configuration, the foreign matter discharge port 17 is provided in the upstream intake duct portion 15U having a larger dimension in the vehicle width direction and a cross-sectional area of the flow path than the downstream intake duct portion 15D, so the opening area of the foreign matter discharge port 17 is increased. be able to.

  As a result, more of the low-temperature air that has passed through the grill opening 43 and is introduced to the back side of the grill opening 43 without being affected by the warm air passing through the radiator 12 or the air warmed by the engine 6. Since it can be introduced into the intake hose 19 through the foreign matter discharge port 17, the engine output can be improved.

  While embodiments of the invention have been disclosed, it will be apparent to those skilled in the art that changes may be made without departing from the scope of the invention. All such modifications and equivalents are intended to be included in the following claims.

  DESCRIPTION OF SYMBOLS 1 ... Vehicle, 1A ... Front end part, 6 ... Engine, 6A ... Front end part, 12 ... Radiator, 12B ... Upper tank, 15 ... Intake duct, 15A ... Air Passage, 15B ... bottom wall, 15C ... ceiling wall, 15D ... downstream intake duct part, 15E ... enlarged part, 15F ... step part, 15G ... front end part, 15U ... Upstream intake duct, 16 ... Air intake, 16B ... Lower end, 17 ... Foreign matter outlet, 17A ... Front end, 17B ... Rear end, 18 ... Connection Mouth, 19 ... Intake hose, 19A ... Air passage, 20 ... Air cleaner, 30 ... Intake device, 40 ... Guide part, 41 ... First guide part, 41B ... Bottom Part 41E ... first extension line 42 ... second guide part 42A ... upper end part 42B ... lower end part 42E ... second extension line 43 ... grill opening , 44 ... Radiator fan shroud, 45 ... Space, 47 ... Projection shape, 48 ... Break Shape, L1 ... dimension (dimension in the vehicle width direction of the upstream intake duct portion), L2 ... dimension (dimension in the vehicle width direction of the downstream intake duct portion), S1 ... cross-sectional area of the flow path (upstream) Channel cross-sectional area of the side intake duct), S2 ... Channel cross-sectional area (channel cross-sectional area of the downstream side intake duct)

Claims (7)

An air intake opening that opens at the front of the vehicle, a connection port provided behind the air intake port, and a foreign matter discharge port that discharges foreign matter contained in the air taken from the air intake port An air intake duct having an air passage formed therein;
An air cleaner to purify the air;
An air intake hose connecting the connection port and the air cleaner;
The foreign matter discharge port is a bottom wall of the intake duct and opens between the air intake port and the connection port,
In the air passage, a downstream portion extends from the air intake port above the foreign matter discharge port, and a downstream portion with respect to the upstream portion so as to guide a part of the air flowing through the air passage to the foreign matter discharge port. An engine intake device comprising a plate-like guide portion that curves downward in a vehicle. The guide portion is
A first guide portion curved in an arc from the ceiling wall of the intake duct at the air inlet toward the foreign matter outlet;
And at least one second guide part that curves toward the foreign substance discharge port below the first guide part,
The first guide portion and the second guide portion so that a projection shape obtained by projecting the first guide portion and the second guide portion in the extending direction of the intake duct coincides with a cross-sectional shape of the air intake port. The engine intake device according to claim 1, wherein: The guide portion is
A first guide portion curved in an arc from the ceiling wall of the intake duct at the air inlet toward the foreign matter outlet;
A second guide portion that curves toward the foreign matter discharge port below the first guide portion,
In the vertical direction of the vehicle, the lower end portion of the first guide portion is extended to the position of the upper end portion of the second guide portion, and the lower end portion of the second guide portion is extended to the position of the lower end portion of the air intake port. The engine intake device according to claim 1, wherein The intake duct has a step portion adjacent to the rear of the air intake and located below the lower end of the air intake,
The engine intake device according to claim 2 or 3, wherein the foreign matter discharge port is formed in the stepped portion. When a first extension line extending the downstream part of the first guide part and a second extension line extending the downstream part of the second guide part are set, the first extension line and the second extension line Forming the first guide portion and the second guide portion so that
When the intake duct is viewed from the vehicle width direction, the front end portion of the foreign matter discharge port is formed to be positioned in front of the second extension line, and the rear end portion of the foreign matter discharge port is the first extension. The engine intake device according to claim 4, wherein the engine intake device is positioned rearward of the line. A grill opening for introducing air from the outside is formed at the front end of the vehicle,
A radiator and a radiator fan shroud attached to the rear surface of the radiator are disposed behind the grill opening,
In the longitudinal direction of the vehicle, the foreign matter discharge port is displaced to the air intake side with respect to the intermediate position between the front end portion of the engine and the front end portion of the intake duct, and the rear end of the foreign matter discharge port The engine intake device according to any one of claims 1 to 5, wherein the portion is disposed in front of the radiator fan shroud. The intake duct is
An upstream side intake duct portion extending from the air intake port to the foreign material discharge port in the extending direction of the air passage;
A downstream intake duct portion extending continuously to the upstream intake duct portion and extending to the intake hose;
The dimension in the vehicle width direction of the upstream intake duct portion is larger than the dimension in the vehicle width direction of the downstream intake duct portion, and the flow passage cross-sectional area of the upstream intake duct portion is the flow of the downstream intake duct portion. The engine intake device according to any one of claims 1 to 6, wherein an enlarged portion is formed in the downstream intake duct portion so as to be larger than a road cross-sectional area.

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