JP2015068221A - Intake device of engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an intake device of an engine, which sets intake passages directed oppositely to each other to set a sufficient intake passage area while suppressing enlargement of the intake device as much as possible, and can secure driveability.SOLUTION: In an intake device 40 of an engine, there are connected to the non-purification chamber 65 side of an air cleaner 50, a first intake passage 53 directed to one direction, and a second intake passage 54 extending along one direction with an inlet 78 for an intake air flow facing oppositely to the direction in which intake air flows in the first intake passage 53. A non-purification chamber 65 has one side wall part 71 and the other side wall part 75 opposed to the one side wall part 71. The first intake passage 53 is connected with the one side wall part 71, and the second intake passage 54 is connected with the other side wall part 75. An element 62 is provided on the downstream side of the non-purification chamber 65.

Description

  The present invention relates to an improvement of an intake device for an engine.

  2. Description of the Related Art An engine intake device mounted on a motorcycle is known that includes an introduction passage that extends in the longitudinal direction of the vehicle and takes in air (see, for example, Patent Document 1 (FIGS. 1 and 3)).

  As shown in FIGS. 1 and 3 of Patent Document 1, the engine intake device (12) (the numbers in parentheses indicate the symbols described in Patent Document 1. The same applies hereinafter) is located directly below the fuel tank (13). Thus, an upper portion of the cleaner case (20) is provided with an intake passage having an opening (34) at the front end along the longitudinal direction of the vehicle and an intake passage having an opening (35) at the rear end. Specifically, an air introduction passage (26) formed of a separate member is disposed on the upper portion of the air cleaner case (20). According to this structure, it is possible to ensure an appropriate intake passage area in a narrow space under the fuel tank (13).

  The widths of the front air introduction passage extending rearward from the front end opening (34) and the rear air introduction passage extending forward from the rear end opening (35) are the same. The intake air flows taken in from the front end opening (34) and the rear end opening (35) collide with each other at the longitudinal center of the air introduction passage (26) and are buffered. It is possible to smoothly flow the intake air flow to the downstream element without blowing through.

  However, in the technique of Patent Document 1, since the air introduction passage (26) formed of a separate member is disposed above the air cleaner case (20), the height of the entire intake device (12) is increased. When the height of the intake device (12) is increased, the fuel tank (13) is disposed immediately above it, so that the capacity of the fuel tank or the air cleaner case (20) is not set unless the fuel tank (13) is increased. There is a problem that it is difficult to secure the capacity on the side.

  Here, the air introduction passage of the conventional example (Patent Document 1) has a structure in which the front and rear intake passages are gathered at the center of the introduction passage member, but the front and rear intake passages are gathered in the unpurified chamber of the air cleaner. In this case, it is only necessary to connect the intake passage to the opposite side walls of the unpurified chamber, so that the vertical width of the entire intake device does not have to be as long as in the conventional example.

However, with such a structure, when the width of the front and rear intake passages provided in the unpurified chamber wraps, a buffer space similar to the conventional example can be set in the unpurified chamber. For example, if the front air introduction passage and the rear air introduction passage have different widths due to the configuration of one front intake passage, two rear intake passages, etc., and there is a portion that does not overlap in the width direction, the flow velocity of the front and rear intake flow As the air pressure increases, the intake air flow partially passes over the non-overlapping parts. If they partially pass each other, the intake air flow as in Patent Document 1 is collided to reduce the flow velocity, and the buffering space cannot be sufficiently configured in the unpurified chamber. The passing intake air flow flows by inertia to the end of the unpurified chamber upstream of the element (21), and the distance to the funnel connected to the engine becomes long. As a result, depending on the driving region, it may be difficult to ensure drivability (driability) performance.
There is a demand for an intake device that can suppress the increase in size of the intake device as much as possible and can ensure drivability performance.

JP-A-2005-233098

  The present invention relates to an engine intake device capable of setting a sufficient intake passage area by setting intake passages that are opposite to each other while suppressing an increase in size of the intake device as much as possible, and ensuring drivability performance. It is an issue to provide.

The invention according to claim 1 is directed to the uncleaned chamber side of the air cleaner that supplies the purified air to the engine, the first intake passage that faces in one direction, and the inlet of the intake air flow along the first direction and the first intake passage. In the engine intake device to which the second intake passage that is opposite to the flowing direction is connected,
The unpurified chamber has one side wall part and the other side wall part facing this one side wall part, the first intake passage is connected to one side wall part, and the second intake passage is The second intake passage is connected to the other side wall, and the second intake passage is separated in a direction perpendicular to one direction, and at least the outlet of the second intake passage protrudes outward from the width of the first intake passage. Two of the two intake passages are arranged, and a rectification unit that directs the intake air flow toward the first intake passage width is provided at the outlet of the two intake passages.

  In the invention according to claim 2, the air cleaner is provided on the downstream side of the unpurified chamber for purifying the unpurified air, on the downstream side of the element, the purification chamber for flowing the purified air, and the purifier chamber And a funnel for rectifying the purified air toward the engine. The funnel is arranged close to the second intake passage side.

  According to a third aspect of the present invention, the purification chamber has a purification chamber side bulging portion that protrudes closer to the engine side than the funnel mounting seat on the first intake passage side.

  In the invention according to claim 4, the air cleaner includes a lower air cleaner case that is divided vertically, an upper air cleaner cover, and an element that is interposed between the upper air cleaner cover and the lower air cleaner case. The non-purification chamber is formed between the air cleaner cover and the element holder, the purification chamber is formed between the element holder and the air cleaner case, and the second intake passage is formed on the upper surface of the air cleaner cover. A diverted lower surface and an upper surface using the lower surface of the duct cover that covers the lower surface from above are formed, and a rectifying wall portion that forms a rectifying portion is formed in the duct cover on the downstream side of the intake passage. .

  In the invention according to claim 5, the intake device is mounted on a saddle-ride type vehicle including a pair of left and right main frames extending from the head pipe to the rear of the vehicle, and the intake device is located immediately after the head pipe and on the left and right sides. The first intake passage connecting portion, which is disposed between the pair of main frames and is provided in the air cleaner cover and to which the first intake passage is connected, has a seat portion along the height direction and facing the front of the vehicle. The first intake passage is configured by a rubber duct that is fitted into an opening provided in the seat portion, extends to the head pipe side, and extends forward of the vehicle relative to the air cleaner in a plan view of the vehicle.

  According to the sixth aspect of the present invention, an intake air temperature sensor is attached to the seat at a side position on one side of the first intake passage, and bulges to the side of the first intake passage on the other side. An unpurified chamber side bulging portion is provided.

  In the first aspect of the invention, the first intake passage is connected to one side wall portion of the unpurified chamber facing each other, and the second intake passage is connected to the other side wall portion. As described above, since the intake passages are connected to the opposing side wall portions, the intake area can be increased as compared with the case where there is one intake passage. Since it becomes easy to secure a predetermined intake air amount, the overhang of the intake passage in the height direction is suppressed. As a result, even if the intake device has two intake passages in which the flow direction of the intake flow is opposite, the increase in size of the intake device can be suppressed.

  Further, the second intake flow passing through the second intake passage is introduced into the unpurified chamber from outside the width of the first intake passage, but the intake flow is brought into the first intake passage width by the rectification unit. The first intake air flow that is rectified and guided and passes through the first intake passage is collided with the opposing side wall portion, and the velocity of the intake air flow decreases. Since the intake air flow that has fallen in speed is sucked by the negative pressure on the engine side, it is guided to the engine in the shortest distance. Thereby, there is no worry that the drivability performance is impaired.

  In the invention according to claim 2, the air cleaner has a purification chamber provided on the downstream side of the element and a funnel provided at the air outlet of the purification chamber, and the funnel is moved toward the second intake passage. Be placed. Of the first intake flow that flows through the first intake passage, there may be a case where a passing intake flow is generated at the center in the width direction of the first intake passage without colliding with the second intake flow.

  This passing airflow tends to flow through the element into a funnel that is shorter in distance than other airflows. In other words, the first intake air flow that has passed is easy to flow to the funnel side that is arranged close to the second intake passage in the unpurified chamber. For this reason, it is possible to make it difficult for the first intake air flow to affect the drivability performance.

  In the invention according to claim 3, the purification chamber has a purification chamber side bulging portion that protrudes closer to the first intake passage than the funnel and to the engine side from the mounting seat of the funnel. Most of the second intake flow entering the unpurified chamber collides with the first intake flow. In contrast to the remaining first intake flow, the intake flow flowing to the side wall of the first intake passage in the unpurified chamber is limited.

  Therefore, even if a purification chamber side bulging portion is set in the purification chamber on the first intake passage side, vortex is rarely generated in the purification chamber side bulging portion. Therefore, the capacity of the purification chamber can be earned at a preferable position, and the drivability (operability) performance can be improved.

  In the invention according to claim 4, since the second intake passage is formed by the air cleaner cover and the duct cover, and the second intake passage is diverted by the air cleaner cover, the number of parts can be reduced. In addition, a rectifying wall portion is formed in the duct cover. Since the rectifying wall portion uses a part of the duct cover, the number of parts can be reduced.

  In the invention according to claim 5, the first intake passage extends toward the head pipe and extends forward of the vehicle relative to the air cleaner in plan view of the vehicle. In other words, since the first intake passage extends forward of the vehicle from the air cleaner, the length of the first intake passage can be set longer. Since the length of the first intake passage can be set longer, the intake noise can be reduced.

  The first intake passage is configured by a rubber duct that extends toward the head pipe and extends forward of the air cleaner. If the first intake passage is a rubber duct, even when the intake device is housed in the body frame and assembled, even if the components are likely to interfere with each other, the rubber duct can be shifted so that The intake device can be easily assembled while avoiding interference. That is, the assembling property of the intake device can be improved.

  In the invention which concerns on Claim 6, an intake temperature sensor is attached to the seat part of the side position of the one side of the 1st intake passage. Since the intake air temperature sensor is attached to the side of one side of the first intake passage, it is possible to effectively utilize a region that tends to become a dead space.

  An unpurified chamber side bulging portion is provided on the other side of the first intake passage. The capacity of the unpurified chamber can be earned by using the other side of the first intake passage that tends to become a dead space.

1 is a left side view of a motorcycle according to the present invention. It is a principal part enlarged view of FIG. 1 showing the intake device of an engine. It is a side view of an engine intake device. FIG. 4 is an enlarged sectional view of a part 4 in FIG. 3. It is sectional drawing (5-5 sectional view of FIG. 10) of an engine intake device and its peripheral part. It is a disassembled perspective view of the intake device of the engine which concerns on attachment of a duct cover. FIG. 7 is a view taken along arrow 7 in FIG. 6 (a bottom view of the duct cover). It is a figure explaining the joining process of a duct cover. It is a perspective view of an intake device of an engine. It is a top view of an engine intake device. It is operation | movement explanatory drawing of the intake device of the engine which concerns on an Example and a comparative example. It is an effect | action figure explaining the flow of intake air.

  Hereinafter, embodiments of the present invention will be described in detail. In the drawings and examples, “up”, “down”, “front”, “rear”, “left”, and “right” respectively indicate directions viewed from the driver who rides the motorcycle.

Embodiments of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the motorcycle 10 is covered with a vehicle body cover 11. The vehicle body cover 11 includes a front cover 12 that covers the periphery of the headlight 21, and radiator units 22L and 22R that extend from the side of the front cover 12 to the rear of the vehicle and are disposed on the front side of the vehicle body (reference numerals on the front side of the figure). Radiator cover 13L, 13R (only the reference numeral 13L on the front side of the figure is shown) covering the periphery of the engine center cover 14, covering the front of the engine 23, located below the radiator covers 13L, 13R, and the engine An under cover 15 that covers the lower part of the engine behind the center cover 14 and a rear cover 16 that covers the side and upper side of the rear wheel 18 above the rear part of the under cover 15 are main elements. A front fender 19 as a mudguard is disposed above the front wheel 17.

  Such a motorcycle 10 is provided at the front end of the vehicle body frame 20 and supports a front wheel steering portion 25 that can steer the front wheel 17 and a rear lower portion of the vehicle body frame 20 that is swingably supported. A rear wheel suspension portion 26, an engine 23 suspended on the vehicle body frame 20 behind the front wheel 17, a seat 27 provided on the rear upper side of the engine 23 and supported by the vehicle body frame 20 and straddled by the driver. And a fuel tank 28 that is provided above the vehicle body frame 20 and supplies fuel to the engine 23. The above-described radiator covers 13L and 13R extend downward from the side surface of the fuel tank 28 and cover the side surface of the vehicle body.

  The motorcycle 10 is a straddle-type vehicle in which a driver rides on a seat 27 disposed between a front wheel 17 and a rear wheel 18. The engine 23 mounted on the motorcycle 10 is a horizontally opposed six-cylinder engine having a crankshaft extending in the front-rear direction of the vehicle.

  The front wheel steering unit 25 includes a front fork 31, a handle 32 attached to the upper end of the front fork 31 and operated by a driver, and a front wheel 17 rotatably attached to the lower end of the front fork 31. And A headlight 21 is attached to the front wheel steering section 25.

  The rear wheel suspension 26 includes a pivot shaft 36 provided on the vehicle body frame 20, a swing arm 37 extending from the pivot shaft 36 toward the rear of the vehicle, and a rear wheel 18 that is rotatably attached to the rear end of the swing arm 37. And have. A silencer 39 extends from the engine 23 toward the rear of the vehicle.

  As shown in FIG. 2, the body frame 20 of the motorcycle 10 includes a head pipe 41 that supports a front wheel steering section 25 (see FIG. 1), and a head pipe 41 that extends obliquely rearward and downward and is supported by an engine 23. A pair of left and right main frames 42L, 42R (only the reference numeral 42L on the front side of the figure is shown), and the engine 23 is supported by extending obliquely rearward and downward from the head pipe 41 below the pair of left and right main frames 42L, 42R. And a pair of left and right down frames 43L and 43R. An intake device 40 that supplies intake air to the engine 23 is disposed between the pair of left and right main frames 42L and 42R above the engine 23 and below the bottom plate 29 of the fuel tank 28.

  As shown in FIG. 3, an air cleaner 50 that is a component of the air intake device 40 includes an air cleaner case 51 that is divided into upper and lower parts, an air cleaner cover 52 that covers the air cleaner case 51 from above, and a front side of the air cleaner cover 52. Are connected so as to cover a part of the upper surface 52a of the air cleaner cover 52, and two second intake passages 54 are provided between the upper surface 52a of the air cleaner cover 52 and the rubber duct 63. Duct covers 64L and 64R (only the reference numeral 64L on the front side of the figure is shown). An intake air temperature sensor 55 is attached to the air cleaner cover 52. The air cleaner case 51 and the air cleaner cover 52 are coupled by a plurality of fastening bolts 56. Next, the fastening structure will be described.

  As shown in FIG. 4, a metal female screw portion 59 having a female screw 58 formed therein is buried in the mating surface 51a of the resin air cleaner case 51 as if it was cast, and an air cleaner cover is formed on the mating surface 51a. The mating surface 52a of 52 is applied, and the fastening bolt 56 is fastened to the female screw 58 from above. The fastening structure of other parts is the same as that described above, and the description thereof is omitted.

  As shown in FIG. 5, the intake device 40 of the engine is formed between an air cleaner cover 52 and a lower air cleaner case 51, and between the air cleaner cover 52 and the element holder 61. The unpurified chamber 65, the element 62 attached to the element holder 61 and purifying unpurified air, and the purified air flowing between the element holder 61 and the air cleaner case 51 on the downstream side of the element 62. A chamber 66 and a funnel 68 provided at an air outlet 67 of the purification chamber 66 for rectifying the purified air toward the engine 23 are provided.

  The unpurified chamber 65 has one side wall 71 and the other side wall 75 facing the one side wall 71, and the first intake passage 53 is connected to the one side wall 71, The second intake passage 54 is connected to the other side wall 75. The funnel 68 is arranged close to the second intake passage 54 side. The purification chamber 66 has a purification chamber-side bulging portion 77 that protrudes closer to the first intake passage 53 than the funnel 68 and to the engine 23 side from the mounting seat 68 a of the funnel 68.

  In summary, the air cleaner 50 that supplies purified air to the engine 23 (see FIG. 2) has a first intake passage 53 that faces in one direction (front-rear direction) and a direction along the one direction (front-rear direction). The second intake passage 54 is connected to the intake flow inlet 78 in the direction opposite to the direction in which the first intake passage 53 flows.

  The second intake passage 54 includes an upper surface 52a of the air cleaner cover 52, a lower surface 152 of the passage, and lower surfaces 64Lb and 64Rb of duct covers 64L and 64R (only the reference numeral 64L on the front side is shown) that covers the lower surface 152 from above. Only the reference numeral 64Lb on the front side of the figure is shown) as the upper surfaces 164L and 164R of the passage (only the reference numeral 164L on the front side of the figure is shown).

In this embodiment, “one direction” is the front-rear direction, but is not limited to this, and includes the left-right direction and the up-down direction.
Further, in the present embodiment, the position of the unpurified chamber is disposed at the upper portion of the intake device, but is not limited thereto, and may be one side in the width direction or the front-rear direction.

  The first intake passage connection portion 81 provided in the air cleaner cover 52 and connected to the first intake passage 53 is provided on one side wall portion 71 along the height direction and facing the front side of the vehicle. Yes. A seat 83 is formed on one side wall 71, and the first intake passage 53 is fitted into a first opening 85 provided in the seat 83. The first intake passage 53 extends toward the head pipe 41 (see FIG. 2). That is, the first intake passage 53 extends forward of the vehicle relative to the air cleaner 50.

  A slope 84 is formed on the other side wall 75, and second openings 86 </ b> L and 86 </ b> R (only the reference numeral 86 </ b> L on the front side of the drawing is shown) are provided on the slope 84. Then, duct covers 64L and 64R (only the reference numeral 64L on the front side is shown) are attached to the rear so as to cover the second openings 86L and 86R, and the upper surfaces of the duct covers 64L and 64R and the air cleaner cover 52 are attached. 52a constitutes a second intake passage 54.

6-8, the assembly structure of the duct covers 64L and 64R forming the second intake passage 54 will be described.
As shown in FIG. 6, the upper surface of the air cleaner cover 52 has one side wall portion 71 extending in the height direction from the front to the rear, and a first ceiling portion 72 extending rearward substantially horizontally from the upper end of the one side wall portion 71. A step portion 73 that descends obliquely rearward and downward from the rear end of the first ceiling portion 72, a second ceiling portion 74 that extends rearward substantially horizontally from the rear end of the step portion 73, and the second ceiling portion 74. The other side wall portion 75 extends obliquely rearward and downward from the rear end, and the rear upper surface portion 76 gently extends from the other side wall portion 75 obliquely downward and rearward. The left and right groove portions 88L and 88R that the left and right duct covers 64L and 64R can engage with the upper surface 52a of the air cleaner cover 52 from the second ceiling portion 74 to the other side wall portion 75 and further to the rear upper surface portion 76, respectively. Is formed.

The left and right duct covers will be described.
As shown in FIG. 7, the air cleaner cover 52 (see FIG. 6) is formed along the contours of the duct covers 64L and 64R on the lower surfaces of the left and right duct covers 64L and 64R, except for the rear end portions serving as air intakes. Engaging convex portions 89L and 89R that can be engaged with the formed left and right groove portions 88L and 88R extend. As will be described later, rectifying wall portions 91L and 91R forming rectifying portions 90L and 90R for rectifying intake air are formed in the duct covers 64L and 64R.

  FIG. 8A to FIG. 8C are diagrams illustrating a duct cover joining process. In the figure, since the left and right structures are the same, the subscripts representing the left and right are omitted. FIG. 8A is a diagram in which the engaging convex portion 89 is brought close to the groove portion 88, FIG. 8B is a diagram in which the engaging convex portion 89 is set in the groove portion 88, and FIG. FIG. 6 is a view in which a duct cover 64 is welded to an air cleaner cover 52.

  In FIG. 8A, the engaging convex portion 89 of the duct cover 64 is brought close to the groove portion 88 of the air cleaner cover 52 as shown by the arrow a in FIG. 8, and the duct is placed at a predetermined position of the air cleaner cover 52 as shown in FIG. Set the cover 64. In FIG. 8C, the duct cover 64 is vibrated, and the duct cover 64 is welded to the air cleaner cover 52 by frictional heat.

  Returning to FIG. 6, the second intake passage 54 is formed by an air cleaner cover 52 and a duct cover 64. Since a part of the second intake passage 54 is constituted by the air cleaner cover 52, the number of parts can be reduced. Further, the duct cover 64 is formed with rectifying wall portions 91L and 91R. Since a part of the duct covers 64L and 64R is diverted to the rectifying wall portions 91L and 91R, the number of parts can be reduced as compared with the case where the rectifying wall portions are separately provided.

  FIG. 9 shows a state in which the duct covers 64L and 64R are welded and attached to the air cleaner cover 52. Since the duct covers 64L and 64R are provided on the left and right, two second intake passages 54L and 54R are provided in the width direction. Such an intake device 40 is disposed immediately after the head pipe 41 and between the pair of left and right main frames 42L and 42R.

  In the intake device 40, the intake temperature sensor 55 is attached to the seat 83 at the side (left side) position of the first intake passage 53, and to the side of the first intake passage 53 on the other side (right side). An unpurified chamber side bulging portion 79 that bulges forward is provided.

  As shown in FIG. 10, each of the air cleaner cover 52 and the left and right duct covers 64L and 64R has, for example, the left side, an “L” mark on the front outer side of the duct cover mounting portion of the air cleaner cover 52, An “L” mark is attached to the left front side of the left duct covers 64L and 64R. Similarly, on the right side, an “R” mark is attached to the front outer side of the duct cover mounting portion of the air cleaner cover 52, and an “R” mark is attached to the front right side of the right duct covers 64L and 64R. “L” and “R” marks are engraved by molding.

  For example, when the left duct cover is assembled, the “L” mark on the air cleaner cover 52 side and the “L” on the duct cover 64L, 64R side are adjacent to each other. Similarly, the “R” mark on the air cleaner cover 52 side and the “R” on the duct cover 64L, 64R side are adjacent to each other. By doing so, it is possible to suppress erroneous assembly of the rectifying wall-attached duct covers 64L and 64R.

  Next, the positional relationship between the first intake passage 53 and the left and right second intake passages 54 will be described. The left and right second intake passages 54 are separated in a direction perpendicular to the vehicle longitudinal direction, which is one direction, and the outlets 94L and 94R of the second intake passage 54 are outside the first intake passage width (A). It is arranged to come out. The outlets 94L and 94R of these two second intake passages 54L and 54R are provided with left and right rectifying units 90L and 90R that direct the intake air flow toward the first intake passage width (A).

In the figure, A is the full width of the front intake passage (first intake passage 53), BL is the full width of the rear left intake passage (second intake passage 54L), and BR is the rear right intake passage (second intake passage 54R). , CL, CR are width wrap regions of the left and right front and rear intake passages, DL and DR are non-wrap regions of the left and right front and rear intake passages, respectively, and E is set in the unpurified chamber 65. This is an intake flow buffer region. The rectifying lines 96L and 96R to which the left and right rectifying units 90L and 90R are extended extend so as to incline in the width direction toward the first intake passage 53, and the first intake passage in the intake flow buffer region (E). It is set to fit within the full width A of 53.
In the present embodiment, the first intake passage 53 is disposed on the front side of the vehicle and the two second intake passages 54 are disposed on the rear side of the vehicle. However, the present invention is not limited to this. For example, the first intake passage 53 may be disposed on the vehicle rear side, and the two second intake passages 54 may be disposed on the vehicle front side. Similarly, the first intake passage 53 may be arranged on the left side of the vehicle, and two second intake passages 54 may be arranged on the right side of the vehicle in the front-rear direction. The first intake passage 53 may be arranged on the right side of the vehicle, and two second intake passages 54 may be arranged on the left side of the vehicle in the front-rear direction. Similarly,
The first intake passage 53 may be disposed on the lower side of the vehicle, and two second intake passages 54 may be disposed on the left and right on the upper side of the vehicle. The first intake passage 53 may be disposed on the upper side of the vehicle, and two second intake passages 54 may be disposed on the left and right on the lower side of the vehicle.

The operation of the engine intake device described above will be described next.
FIG. 11A is an operation explanatory diagram of the engine intake device according to the embodiment, and FIG. 11B is an operation explanatory diagram of the engine intake device according to the comparative example.

  As shown in the comparative example of FIG. 11B, the first intake air flow enters the unpurified chamber 65 from the first intake passage 53, and the second intake passage 54LB, 54RB enters the unpurified chamber 65 from the second intake passage. Intake flow enters. A part of the second intake flow of the second intake flow is a part of the first intake flow in the collision regions SLb and SRb when the flow velocity of the intake flow increases in a high load / high rotation region of the engine. Although it collides with the intake flow, another part does not collide with the first intake flow and passes each other as shown by the arrows b1 and b1. This passing intake air flow flows to the end of the unpurified chamber by inertia, and the distance to reach the funnels 68L and 68R becomes longer. Then, so-called drivability may be reduced.

  As shown in the embodiment of FIG. 11A, in the present invention, the second intake passages 54L and 54R are provided with the rectifying portions 90L and 90R, so the second intake air passing through the second intake passage 54 is provided. The flow is introduced into the unpurified chamber 65 from outside the width of the first intake passage 53, and is rectified and guided into the first intake passage width (A) by the rectifiers 90L and 90R. Then, the first intake flow passing through the first intake passage 53 and the intake flow buffer region E (see FIG. 10) located between the one side wall 71 and the other side wall 75 facing each other in detail. Are collided in the collision areas SLa and SRa, and the velocity of the intake air flow decreases. The collision areas SLa and SRa can be expanded more than the collision areas SLb and SRb of the comparative example by the guide effect of the rectifying unit. The intake air flow that has fallen in speed is sucked by the negative pressure on the engine side, and is therefore led to the engine 23 (see FIG. 2) at the shortest distance. Thereby, the intake efficiency of the engine 23 is maintained, the occurrence of breathing of the engine 23 is suppressed, the feeling of acceleration is maintained, and there is no concern that the so-called drivability performance is impaired.

  Referring also to FIG. 5, the air cleaner 50 has a purification chamber 66 provided on the downstream side of the element 62, and funnels 68L and 68R provided at the air outlets of the purification chamber 66. The funnels 68L and 68R are The second intake passages 54L and 54R are arranged close to each other. Of the first intake flow that flows through the first intake passage 53, an intake flow a1 that passes by without colliding with the second intake flow may occur in the central portion in the width direction of the first intake passage 53.

  The passing intake air flow easily passes through the element 62 and flows into the funnels 68L and 68R having a shorter distance than the other intake air flows. That is, the first intake air flow that has passed is easy to flow toward the funnels 68L and 68R disposed near the second intake passage 54 in the unpurified chamber 65. For this reason, it is possible to make it difficult for the first intake air flow to affect the drivability performance.

  As shown in FIG. 12, the first intake air flow passing through the first intake passage 53 and the second intake air flow passing through the second intake passage 54 collide with each other in the intake flow buffer region (E). The flow rate drops. After that, it is sucked by the negative pressure on the engine side and smoothly passes through the element 62 and reaches the funnel 68. As a result, since the intake flow is directed to the funnel 68 with the shortest distance, the drivability performance can be ensured satisfactorily. In the present invention, even if there are non-wrap regions (DL, DR) as shown in FIG. 10 in the front and rear intake passages in the unpurified chamber 65, the front and rear intake flows can collide to reduce the flow velocity.

  In addition, the first intake passage 53 is connected to one side wall portion 71 of the unpurified chamber 65 that faces the other, and the second intake passage 54 is connected to the other side wall portion 75. As described above, since the intake passages 53 and 54 are connected to the opposing side wall portions 71 and 75, respectively, it is possible to increase the intake amount as compared with the case where there is one intake passage. Since it becomes easy to ensure a predetermined intake force, the protrusion of the intake passages 53 and 54 in the height direction is suppressed. As a result, even if the intake device 40 has two intake passages 53 and 54 in which the flow direction of the intake flow is opposite, the increase in size of the intake device 40 can be suppressed. Thereby, since the bottom plate 29 of the fuel tank 28 can be moved downward, the capacity of the fuel tank 28 can be earned.

  Further, the purification chamber 66 has a purification chamber side bulging portion 77 that protrudes closer to the first intake passage 53 than the funnel 68 and to the engine 23 (see FIG. 2) side than the mounting seat 69 of the funnel 68. . Most of the second intake flow entering the unpurified chamber 65 collides with the first intake flow. In contrast to the remaining first intake air flow, the intake air flow flowing to the side wall of the first intake passage in the unpurified chamber is limited.

  Therefore, even if the purification chamber side bulging portion 77 is set in the purification chamber on the first intake passage 53 side, vortex is hardly generated in the purification chamber side bulging portion 77. Therefore, the capacity of the purification chamber can be earned at a preferred position, and the drivability (operability) performance can be further enhanced.

  Returning to FIG. 9, the first intake passage 53 extends toward the head pipe 41 and extends forward of the vehicle relative to the air cleaner 50 in a plan view of the vehicle. That is, since the first intake passage 53 extends forward of the vehicle from the air cleaner 50, the first intake passage 53 can be set longer. Since the first intake passage 53 can be set longer, the intake noise can be reduced.

  The first intake passage 53 includes a rubber duct 63 that extends toward the head pipe 41 and extends forward from the air cleaner 50. If the first intake passage 53 is the rubber duct 63, when the intake device 40 is housed in the vehicle body frame 20 and assembled, even if the arrangement is likely to cause interference between components, the rubber duct 63 is shifted and arranged. The intake device can be easily assembled while avoiding interference with the frame and parts. That is, the assembling property of the intake device 40 can be improved.

  In addition, an intake air temperature sensor 55 is attached to a seat portion 83 at a side position on one side (left side) of the first intake passage 53. Since the intake air temperature sensor 55 is attached to the left side of the first intake passage 53, it is possible to effectively utilize a region that tends to become a dead space.

  Further, an unpurified chamber side bulging portion 79 is provided on the other side (right side) of the first intake passage. The capacity of the unpurified chamber 65 (see FIG. 5) can be earned by using the right side of the first intake passage 53 that tends to become a dead space.

  Although the present invention is applied to a motorcycle in the embodiment, it can also be applied to a tricycle and can be applied to a general vehicle.

  The present invention is suitable for motorcycles.

  DESCRIPTION OF SYMBOLS 10 ... Saddle type vehicle (motorcycle), 23 ... Engine, 40 ... Engine intake device, 41 ... Head pipe, 42L, 42R ... Main frame, 50 ... Air cleaner, 51 ... Air cleaner case, 52 ... Air cleaner cover, 53 ... First intake passage, 54 ... second intake passage, 55 ... intake temperature sensor, 61 ... element holder, 62 ... element, 63 ... rubber duct, 64L, 64R ... duct cover, 65 ... unpurified chamber, 66 ... purification chamber 67 ..., 68 ... Funnel, 71 ... One side wall, 75 ... Other side wall, 77 ... Purifying chamber side bulging portion, 78 ... Inlet flow inlet, 79 ... Unpurified chamber side bulging portion, 81 ... First intake passage connecting portion, 83 ... seat portion, 85 ... opening (first opening) 90L, 90R ... rectifying portion, 91L, 91R ... rectifying wall portion, 94R ... outlet of the second intake passage.

Claims (6)

A first intake passage (53) directed in one direction toward the unpurified chamber (65) side of the air cleaner (50) for supplying purified air to the engine (23), and an intake flow inlet (78) along the one direction. ) Is connected to a second intake passage (54) that is opposite to the direction of flow through the first intake passage (53).
The unpurified chamber (65) has one side wall (71) and the other side wall (75) opposite to the one side wall (71).
The first intake passage (53) is connected to the one side wall (71),
The second intake passage (54) is connected to the other side wall (75),
The second intake passage (54) is separated in a direction perpendicular to the one direction, and at least outlets (94L, 94R) of the second intake passage are in the width of the first intake passage (53). Two are arranged so as to go outward,
The intake air of the engine is characterized in that the outlets (94L, 94R) of these two intake passages are provided with rectification sections (90L, 90R) for directing the intake air flow toward the width of the first intake passage (53). apparatus. The air cleaner (50) is provided on the downstream side of the unpurified chamber (65) to purify unpurified air, and purified on the downstream side of the element (62) to flow purified air. A chamber (66) and a funnel (68) provided at the air outlet of the purification chamber (66) for rectifying the purified air toward the engine (23),
The intake system for an engine according to claim 1, wherein the funnel (68) is arranged close to the second intake passage (54).   The purification chamber (66) is disposed on the first intake passage (53) side of the funnel (68) and on the engine (23) side of the mounting seat of the funnel (68). The intake device for an engine according to claim 2, further comprising a side bulging portion (77). The air cleaner (50) is divided into a lower air cleaner case (51), an upper air cleaner cover (52), an upper air cleaner cover (52), and the lower air cleaner case (51). And an element holder (61) to which the element (62) is mounted.
The unclean chamber (66) (65) is formed between the air cleaner cover (52) and the element holder (61),
The purification chamber (66) is formed between the element holder (61) and the air cleaner case (51),
The second intake passage (54) is formed by a lower surface using the upper surface of the air cleaner cover (52) and an upper surface using the lower surface of the duct cover (64L, 64R) covering the lower surface from above,
A rectifying wall portion (91L, 91R) forming the rectifying portion (90L, 90R) is formed in the duct cover (64L, 64R) on the downstream side of the second intake passage (54). The intake device for an engine according to claim 1. The intake device (40) is mounted on a saddle-ride type vehicle including a pair of left and right main frames (42L, 42R) extending from the head pipe (41) to the rear of the vehicle,
The intake device is disposed immediately after the head pipe (41) and between the pair of left and right main frames (42L, 42R),
The first intake passage connection portion (81) provided in the air cleaner cover (52) to which the first intake passage (53) is connected has a seat along the height direction and facing the front of the vehicle. Part (83),
The first intake passage (53) is fitted into an opening (85) provided in the seat portion (83), extends toward the head pipe (41), and, when viewed in a plan view of the vehicle, the air cleaner (50). The engine air intake device according to claim 4, further comprising a rubber duct (63) extending forward of the vehicle.   An intake air temperature sensor (55) is attached to the seat (83) at a lateral position on one side of the first intake passage (53), and the first intake passage ( The engine intake device according to claim 5, further comprising an unpurified chamber side bulging portion (79) that bulges to the side of 53).

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