JP4464013B2 - Intake intake device for vehicle engine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention mainly relates to an intake intake device for a vehicle engine mounted on a motorcycle or the like.
[0002]
[Prior art]
In conventional motorcycles, an air intake duct that forms an air intake port for taking in intake air into the engine is formed integrally with the cowling on the front surface of the cowling mounted on the front portion of the vehicle body. In addition, an intake duct was connected via a rubber seal (Japanese Patent Publication No. 2704369). In this configuration, since the air intake duct is formed integrally with the cowling, the opening area and shape of the air intake are limited by the shape and dimensions of the cowling, which not only reduces design and design freedom. When it is necessary to change the opening area or shape of the air intake port in order to improve engine output, the entire cowling must be changed.
[0003]
Therefore, in recent years, it has been proposed that an air intake duct provided separately from the cowling is detachably attached to the cowling (Japanese Patent Application No. 11-266745). As shown in FIG. 7, the air intake duct has a flat air intake passage 1 that is long on the left and right, and the air intake passage 1 is divided into right and left by a branch wall 2 at the center in the left-right direction. The air intake duct is attached to the central lower surface portion of the cowling via a pair of left and right bosses 3 formed on the upper surface of the front portion, and a pair of socket portions 4 formed on the left and right of the rear end portion. 4 and the mounting hole 7 are connected to the rear end portion of the intake duct.
[0004]
[Problems to be solved by the invention]
However, as indicated by arrows in FIG. 7, in the air intake duct, air A2 flowing toward the side portion in the air intake passage 1 as it travels at a high speed travels along the outer peripheral surface of the surrounding cowling. The air is pulled by the ambient air A1 flowing to the side, and flows into the air intake passage 1 while changing the flow direction to the outside. Therefore, the ram pressure of the air in the air intake passage 1 is relatively high because the air A2 moves straight in the direction opposite to the traveling direction of the vehicle body and flows in at the center in the left-right direction. , The air A3 is lowered by the amount having the velocity component directed outward, and the ram pressure of the entire air intake passage 1 is lowered. As a result, the air intake duct deteriorates its original function of supplying intake air whose pressure is increased by utilizing the compression characteristic of air to the engine. Therefore, in order to supply a required amount of intake air to the engine, it is necessary to set the opening area of the air intake passage 1 of the air intake duct to be relatively large, which increases the running resistance of the vehicle body.
[0005]
The present invention has been made in view of the above-described conventional problems, and includes a vehicle including an air intake duct that can increase the overall ram pressure inside the passage without increasing the opening area of the air intake passage. An object of the present invention is to provide an intake intake device for an engine.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, an intake intake device for a vehicle engine according to one configuration of the present invention includes an intake duct for taking in intake air into the engine, and an air intake passage connected to an upstream end of the intake duct. The air intake duct is disposed at a central portion in the left-right direction of a cowling attached to the front portion of the vehicle body, and the air intake passage is connected to the central passage. A partition member is provided that divides into a left and right pair of side passages, and the partition member extends from the lower end of the air intake passage to 1/3 to 2/3 of the passage height.
[0007]
According to this configuration, the air flowing into the central passage portion in the air intake passage during high-speed traveling is restricted by the partition member, particularly the air flowing into the side portion in the central passage portion, so that the outer peripheral surface of the cowling Without being affected by the air flowing outward of the vehicle body along the vehicle body, the air travels straight in the direction opposite to the traveling direction of the vehicle body into the central passage portion. In addition, since the right and left side passage portions in the air intake passage have a partition member on the central passage portion side, the air flowing into the left and right side passage portions of the air intake passage on the outer peripheral surface of the cowling The air flowing along the outside is restrained from being pulled, and the velocity component in the outside direction is reduced. Therefore, since the ram pressure in the side passage portion can be prevented from lowering in the air intake passage, the overall ram pressure in the air intake passage can be kept high, and the opening area of the air intake duct can be increased. Therefore, the required inflow air amount can be obtained.
[0008]
Further, the partition member, so that extends from the lower end of the air intake passage to 1 / 3-2 / 3 of the passage height, the ram pressure of the side passage portion of the pair of left and right air intake passage Can be kept as high as possible. That is, when the partition member is set to 1/3 or less of the passage height, the effect of the partition member is reduced, and the side passage of the air intake passage is affected by the air flowing along the outer peripheral surface of the cowling. If the ram pressure of the air flowing into the part does not rise sufficiently and is set to 2/3 or more, the amount of air leaking from the central passage part of the air intake passage to the side passage part is reduced, and the inflowing air becomes central. Since the amount of air flowing into the left and right side passage portions is slightly reduced due to excessive concentration in the passage portion, the ram pressure is also lowered.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a side view showing a motorcycle equipped with a vehicle engine intake intake device according to an embodiment of the present invention. In the motorcycle, a front wheel 11 is attached to a front fork 10 that is pivotally supported by a head pipe 9 at the front end of a vehicle body frame 8, and a rear wheel 13 is mounted on a swing arm 12 that is pivotally supported at the lower center of the vehicle body frame 8. The rear wheel 13 is driven by the engine 14 attached to the lower center of the vehicle body frame 8 and is steered by the handle 17 fixed to the upper end portion of the front fork 10.
[0010]
The front half of the body frame 8 is a single main melee 18 having a monocoque structure whose front end is connected to the head pipe 9, and an air cleaner 19 for cleaning air to the engine 14 is provided in the main frame 18. A resin intake duct 21 for taking in the intake air to the engine 14 is connected to a pair of left and right inlets 20 formed at the front thereof. The upstream ends of both intake ducts 21 are connected to an air intake duct 23 that forms an air intake passage 22. There may be a case where only one intake duct 21 connected to both inlets 20 is provided. The air intake duct 23 is attached to the cowling 24 at a position where the front end thereof substantially matches the front end of the cowling 24 attached to the front portion of the vehicle body. The intake duct 21, the air intake duct 23, and the cowling 24 are each a resin molded product. A cleaner element 27 is provided inside the air cleaner portion 19.
[0011]
The rear half of the body frame 8 is composed of two left and right seat rails 28 extending rearward from the rear part of the main frame 18 and a reinforcing member 29. A fuel tank (not shown) and a driver are disposed on the upper part of the seat rail 28. The seat 30 is mounted. A duct 32 is connected to the rear lower surface of the main frame 18 to connect the air cleaner 19 and a fuel supply device (in this example, a carburetor) 31 of the engine 14.
[0012]
As shown in FIG. 2, the cowling 24 is bifurcated so that the lower portion thereof does not buffer the front wheel 11, and the left and right sides 1 have the lamp unit 33 supported by the cowling 24 face the front in the middle. A pair of openings 34, 34 are formed. The air intake duct 23 is disposed below the central portion in the left-right direction of the cowling 24 and has a flat shape that is long in the left-right direction when viewed from the front.
[0013]
FIG. 3 is a partially broken side view showing a state in which the air intake duct 23 connected to the upstream end of the intake duct 21 is fastened to the lower portion of the cowling 24. FIG. 4 is a plan view showing a connection state between the air intake duct 23 and the intake duct 21. FIG. 5 is a perspective view of the cowling 24 with the air intake duct 23 attached. As shown in FIG. 5, the air intake passage 22 inside the air intake duct 23 is divided into left and right by a branch wall 40 provided on the downstream side of the front end portion, and further, the branched wall divided into two. 40 side spaces are partitioned by a pair of left and right partition members 41 and 41 into a central passage portion 22a at the center in the left-right direction and left and right side passage portions 22b.
[0014]
As shown in FIG. 3, the partition member 41 has a front end edge 41 a that is inclined rearward toward the upper side, and is 1 / 2H with respect to the passage height H from the lower end portion of the air intake passage 22. The height h is set. The height h of the partition member 41 is preferably set to 1/3 to 2 / 3H, and most preferably set to 1 / 2H as in this embodiment. Thereby, the ram pressure of the pair of left and right side passage portions 22b and 22b of the air intake passage 22 can be kept as high as possible. That is, when the partition member 41 is set to 1/3 or less of the passage height H, it is curved under the influence of the air flowing along the outer peripheral surface of the cowling 24, and when set to 2/3 or more, This is because the air flowing into the air intake passage 22 is excessively concentrated in the left and right central passage portions 22a and 22a, and the amount of air flowing into the left and right side passage portions 22b and 22b is slightly reduced. Further, as shown in FIG. 2, the partition members 41 and 41 are set at an intermediate position D / 2 of a distance D between the center portion (vehicle body center) of the central branch wall 40 and the side end portion of the air intake passage 22. And it is preferable to set the width | variety of the left-right direction of each center channel | path part 22a and the side channel | path part 22b to the same.
[0015]
As shown in FIG. 3, the air intake duct 23 is branched by bringing the upper end of the branch wall 40 into contact with the central lower surface 24 a of the cowling 24 and inserting the bolt 42 through the mounting hole in the central lower surface. By being screwed into the screw hole 40 a of the wall 40, it is attached to the central lower surface portion 24 a of the cowling 24. The front end portion of the intake duct 21 is fitted and attached between the rear end portion of the central lower surface portion 24 a of the cowling 24 and the rear end portion of the air intake duct 23. That is, the overlapping portion of the front end upper portion of the intake duct 21 and the central lower surface portion 24a of the cowling 24 is screwed into the nut 42 fixed to the intake duct 21 by inserting the bolt 42 through the attachment hole of the central lower surface portion 24a. Are connected. The front end lower part of the intake duct 21 and the rear end part of the air intake duct 23 are screwed into the rubber nut 47 from below the air intake duct 23 with the cowling lower 44 sandwiched therebetween. Are connected.
[0016]
In this embodiment, since the air intake passage 22 is partitioned into a central passage portion 22a and a side passage portion 22b by a pair of left and right partition members 41, 41, the central passage portion in the air intake passage 22 when traveling at high speed. The air that flows into 22a is straightly flowed in the direction opposite to the traveling direction without being greatly affected by the air flowing along the outer peripheral surface of the cowling 24. Further, since the side passage portions 22b on both the left and right sides of the air intake passage 22 have the partition member 41 on the central passage portion side, the air flowing toward the side passage portions 22b flows on the outer peripheral surface of the cowling 24. It is restrained from being pulled by the air flowing left and right along, and the velocity component in the outer direction is reduced.
[0017]
Accordingly, since the decrease in the ram pressure of the left and right side passage portions 22b is suppressed in the air intake passage 22, the overall ram pressure in the air intake passage 22 can be kept high. Therefore, in this embodiment, a required inflow air amount can be obtained without increasing the opening area of the air intake duct 23, and the running resistance of the vehicle body can be reduced. In other words, when the conventional air intake duct 23 having the same opening area is provided, the intake efficiency of the engine 14 can be improved.
[0018]
Next, since the experiment for confirming the above-mentioned effect was conducted, the result will be described. FIG. 6A shows the air intake duct 23 provided in the embodiment. FIG. 6B shows an air intake duct 23A according to a modification included in the present invention, in which a pair of left and right partition members 52 are set to the same height as the passage height of the air intake passage 22. FIG. 7C shows the conventional air intake duct 53 shown in FIG. 7, which has only the branch wall 2 at the center in the left-right direction.
[0019]
The three types of air intake ducts 23, 23A, 53 are respectively attached to the cowling 24, and air with a wind speed of 220 km / h is blown from the front, while the air intake ducts 23, 23A, 53 are shown in FIG. The ram pressure was measured at A to C indicated by diagonal lines. As a result, the ram pressure in the A portion at the center of the air intake passage 22 is the same 222 mmAq in each of the air intake ducts 23, 23A, 53, and the side passage portion 22b from the side portion in the central passage portion 22a. The ram pressure of part B, which is a region near the central passage portion, is 214 mmAq in the air intake ducts 23 and 23A used in the embodiment of the present invention, whereas the conventional air intake duct 53 Was as low as 210 mmAq. Further, the ram pressure of the portion C, which is the central portion of the side passage portion 22b, is as low as 178 mmAq for the air intake duct 23 of the above embodiment and 170 mmAq for the modified air intake duct 23A. The inlet duct 53 was as low as 158 mmAq.
[0020]
As is clear from the above experimental results, when the air intake duct 23 of the above embodiment is used, a relatively high ram pressure can be maintained in the left and right side passage portions of the air intake passage 22. In addition, when the modified air intake duct 23A is used, the ram pressure in the left and right side passage portions of the air intake passage 22 is slightly reduced as compared with the above embodiment. Compared with the case where the passage 22 is used, it is possible to maintain a much higher ram pressure.
[0021]
The central branch wall 40 of the air intake passage 22 is provided to divide the air intake passage 22 into two according to the bifurcated intake duct 21. If it is one, it will be omitted.
[0022]
【The invention's effect】
As described above, according to the intake intake device for a vehicle engine according to the present invention, a decrease in the ram pressure in the left and right side passage portions in the air intake passage can be suppressed. The pressure can be kept high, and the required inflow air amount can be obtained without increasing the opening area of the air intake duct.
[Brief description of the drawings]
FIG. 1 is a side view showing a motorcycle equipped with an intake intake device for a vehicle engine according to an embodiment of the present invention.
Fig. 2 is a front view of a cowling mounted on the motorcycle.
FIG. 3 is a side view showing a partially broken view of the structure for attaching the air intake duct to the cowling.
FIG. 4 is a plan view showing a connection state between the air intake duct and the intake duct.
FIG. 5 is a perspective view of the cowling in a state where the same air intake duct is mounted.
6A and 6B are front views of an air intake duct showing an embodiment and a modification of the present invention, and FIG. 6C is a front view of a conventional air intake duct shown for comparison. It is.
FIG. 7 is a perspective view showing an air intake duct used in a conventional intake system for a vehicle engine.
[Explanation of symbols]
8 ... Body frame (vehicle body), 14 ... Engine, 21 ... Intake duct, 22 ... Air intake passage, 22a ... Central passage portion, 22b ... Side passage portion, 23, 23A ... Air intake duct, 24 ... Cowling, 41, 52 ... partition members.

Claims (1)

An intake duct for taking in the intake air into the engine;
An air intake duct forming an air intake passage connected to an upstream end of the intake duct;
The air intake duct is disposed at a central portion in the left-right direction of a cowling attached to the front portion of the vehicle body. A partition member for partitioning is provided,
The partition member is an intake intake device for a vehicle engine that extends from a lower end portion of the air intake passage to 1/3 to 2/3 of the passage height .

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