JP5365405B2 - Engine intake system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact intake device for an engine which can suppress a mounting space while sufficiently securing a passage for straightening a flow of air to be sucked. <P>SOLUTION: An intake device for an engine is equipped with an air cleaner 10 incorporating an element 12 inside a case 11, and an upstream side intake pipe 15 and a downstream side intake pipe 16 which form, together with the case 11, an intake passage 13 on the upstream side from the element 12 and an intake passage 14 on the downstream side from the element 12, respectively, wherein the intake passage 13 on the upstream side consists of a side passage part 13a on the upstream side situated in proximity of an outer peripheral part of the element 12 and a return passage part 13b on the upstream side heading one surface 12c side of the element 12 from the side passage part 13a on the upstream side, and the intake passage 14 on the downstream side consists of a side passage part 14a on the downstream side situated in proximity of an outer peripheral part of the element 12 and a return passage part 14b on the downstream side heading the side passage part 14a on the downstream side from the other surface 12d of the element 12. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to an intake device for an engine, and more particularly to an intake device for an engine in which an air cleaner is disposed upstream of an intake port of an internal combustion engine.

  In an engine mounted on a vehicle or the like, an air cleaner is disposed on the upstream side of the intake passage, and air purified by the air cleaner is sucked. In addition, the flow rate of intake air (hereinafter referred to as intake air amount) is detected by an air flow meter disposed in the vicinity of the air cleaner, and operation control according to the intake air amount is executed.

  As an intake device for an engine equipped with this type of air cleaner, for example, an intake passage upstream of the throttle chamber is formed by an elastic duct having a straight portion on the upstream end side and a bellows portion on the downstream end side, and an intermediate portion of the duct By installing an air flow meter in the air, the vibration of the engine is absorbed by the bellows part, and the disturbance of the intake air flowing into the duct from the air cleaner is rectified by the straight part to ensure the detection accuracy of the air flow meter Is known (for example, see Patent Document 1).

  In addition, there is a design that reduces the mounting space in the intake system upstream of the air flow meter by bending the intake passage in the vicinity of the air cleaner element or by inserting the straight portion into the air cleaner case (for example, , See Patent Document 2).

JP 09-209857 A JP 05-256216 A

  However, in the conventional engine intake device provided with the elastic duct having the straight portion on the upstream end side and the bellows portion on the downstream end side, the duct from the air cleaner to the throttle chamber becomes long. There is a problem that it is difficult to save the mounting space.

  In addition, if the intake passage is bent near the air cleaner element or the straight part is inserted into the air cleaner case to reduce the mounting space, especially the intake air after passing through the air cleaner element There is a problem that the flow tends to be disturbed and the accuracy of the intake air amount detection by the air flow meter is lowered.

  Therefore, the present invention provides a compact engine intake device that can reduce the mounting space while sufficiently securing a passage for rectifying the flow of the intake air.

  In order to solve the above problems, an air intake device for an engine according to the present invention is connected to an air cleaner in which an air cleaner element is housed in an air cleaner case and the air cleaner case, respectively, and is connected to the air cleaner case and an upstream side of the air cleaner element. An intake system for an engine having an intake passage and an upstream intake pipe that respectively form an intake passage downstream from the air cleaner element, wherein the upstream intake passage is an outer peripheral portion of the air cleaner element An upstream side passage portion located near the upstream side passage portion, and an upstream turn-back passage portion from the upstream side passage portion toward the one surface side of the air cleaner element. , A lower part located in the vicinity of the outer periphery of the air cleaner element And the side passage portion side, and a folded passage portion downstream directed from the other side of the air cleaner element to the side passage portion of the downstream, and has a.

  With this configuration, the overall length of the intake device in the intake direction can be shortened by the amount of the upstream and downstream folded passage portions, and a compact intake device with reduced mounting space can be obtained. In addition, since the flow of intake air can be rectified in the downstream side passage section located in the vicinity of the air cleaner element, a compact intake air can be secured while ensuring a sufficient rectification passage length suitable for intake air amount detection, etc. The device can do it.

In addition, the passage cross-sectional area of the upstream side intake pipe can be sufficiently secured, the degree of freedom of the installation posture of the downstream side intake pipe can be increased, and the undulation of the outer surface portion of the intake device can be suppressed.

More preferably, the insertion tube portion passes through the upstream intake passage inside the air cleaner case. With this configuration, the upstream side intake pipe and the downstream side intake pipe are arranged on the same side with respect to the air cleaner element, and the upstream side intake passage is formed around the downstream side intake pipe so that the upstream side The cross-sectional area of the intake passage can be sufficiently secured inside the air cleaner case.

  Further, the upstream folded passage portion may be formed inside the air cleaner case by the air cleaner case and the air cleaner element. With this configuration, the upstream folded passage portion can be easily formed between the air cleaner case and the air cleaner element, the passage sectional area of the upstream intake passage can be sufficiently secured, and the structure of the intake device is also simple. It will be possible. The side passage portion of the upstream intake passage is formed by at least the air cleaner case of the air cleaner case and the air cleaner element when the side surface portion and the other surface side of the air cleaner element are partitioned by an air cleaner case. When the upstream side intake passage and the other side of the air cleaner element are partitioned by the downstream side intake pipe, the air cleaner case and the air cleaner element can be formed by at least the air cleaner case and its insertion pipe portion.

  In the engine intake device having the insertion pipe portion, an insertion hole for inserting the downstream side intake pipe is formed in the air cleaner case, and the insertion pipe portion is configured to be extendable, and the air cleaner case and the downstream side It is preferable that a seal member for closing the insertion hole around the downstream side intake pipe is interposed between the side intake pipe and the side intake pipe.

  With this configuration, it is possible to absorb a change in the relative position between the engine and the air cleaner when the engine shakes or vibrates.

  Further, it is preferable that the insertion tube portion has a bellows portion, and the bellows portion forms the downstream side passage portion. As a result, it is possible to reliably absorb a change in the relative posture between the engine and the air cleaner when the engine shakes or vibrates.

  Moreover, it is preferable that the said sealing member consists of a flexible cylindrical body which has one end part supported by the said air cleaner case, and the other end part supported by the said downstream side intake pipe. This also reliably absorbs a change in the relative posture between the engine and the air cleaner when the engine shakes or vibrates. Note that the sealing member may be, for example, a beveled member or may be provided with a bellows.

  In any of the engine intake devices described above, it is preferable that the upstream side intake pipe and the downstream side intake pipe are arranged on the same side surface side with respect to the air cleaner element. With this configuration, a compact and simple intake device is obtained.

  In this case, it is more preferable that the upstream side passage portion and the downstream side passage portion extend substantially in parallel with the passage direction of the intake air with respect to the air cleaner element. As a result, it is possible to form a flow of intake air in which both side passage portions have substantially constant cross-sectional areas and cross-sectional shapes in the rectifiable section and suppress pressure loss.

  According to the present invention, it is possible to provide a compact engine intake device that can suppress the mounting space while sufficiently securing a passage for rectifying the flow of the intake air.

1 is a schematic plan sectional view of an intake device for an engine according to a first embodiment of the present invention. It is II-II arrow sectional drawing of FIG. FIG. 3 is a cross-sectional view taken along the line III-III in FIG. 1. FIG. 4 is a cross-sectional view taken along arrow IV-IV in FIG. 1. 1 is a schematic cross-sectional view showing a mode in which an air cleaner element and a downstream side intake pipe are unitized in an engine intake device according to a first embodiment of the present invention. It is an expanded sectional view of the vicinity of the seal member in the intake device of the engine according to the first embodiment of the present invention. It is an external appearance perspective view of the vicinity of the seal member in the intake device of the engine which concerns on 2nd Embodiment of this invention. It is an expanded sectional view of the vicinity of the seal member in the engine intake device according to the second embodiment of the present invention.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
FIGS. 1-6 has shown schematic structure of the intake device of the engine which concerns on 1st Embodiment of this invention. The present embodiment exemplifies a case where the present invention is applied to an intake device of a gasoline engine for vehicles (hereinafter simply referred to as an engine), and the intake device of the engine of this embodiment is an engine of a vehicle (not shown). It is stored with the engine in the compartment.

  First, the configuration will be described.

  As shown in FIGS. 1 to 4, the air intake device of the present embodiment is connected to an air cleaner 10 in which an air cleaner element 12 is housed in an air cleaner case 11, and the air cleaner case 11 together with the air cleaner case 11. An upstream intake pipe 15 that forms an upstream intake passage 13, and a downstream intake pipe 16 that is connected to the air cleaner case 11 and that forms an intake passage 14 downstream of the air cleaner element 12 together with the air cleaner case 11. Yes.

  The air cleaner case 11 is supported by a vehicle body-side support member (not shown) with the upper side in FIG. 1 facing the front side of the vehicle, for example, and the left-right direction in FIG. As shown in FIG. 4, the air cleaner case 11 is composed of, for example, plastic upper and lower concave case members 11a and 11b. When the air cleaner element 12 is replaced, the coupling between the case members 11a and 11b is released. Thus, the inside of the air cleaner case 11 can be opened.

  The air cleaner element 12 is a known element that captures and removes air sucked into the engine, that is, dust in the intake air, and is a filter material 12a made of, for example, a cotton-like or non-woven-like filter medium or a filter paper bent into a bellows shape. Is held in the air cleaner case 11 by an outer peripheral frame 12b that is detachable.

  The upstream intake passage 13 introduces air into the air cleaner case 11, while the upstream side passage portion 13 a located in the vicinity of the outer peripheral frame 12 b (outer peripheral portion) of the air cleaner element 12 inside the air cleaner case 11. And the flow direction of the intake air flowing into the air cleaner element 12 from the one surface 12c side of the air cleaner element 12 with respect to the flow direction of the intake air passing through the upstream side passage portion 13a is substantially opposite. An upstream folded passage portion 13b from which the flow is folded toward the one surface 12c side of the air cleaner element 12 from the upstream side passage portion 13a.

  The downstream intake passage 14 has a downstream side passage portion 14a located in the vicinity of the outer peripheral frame 12b of the air cleaner element 12 and the flow direction of the intake air flowing out from the other surface 12d side of the air cleaner element 12. The downstream where the flow is turned from the other surface 12d side of the air cleaner element 12 toward the downstream side passage portion 14a so that the flow direction of the intake air passing through the downstream side passage portion 14a is substantially reversed. Side turn-back passage portion 14b. The downstream intake passage 14 communicates with each intake port of the engine.

  The upstream side intake pipe 15 is formed integrally with the air cleaner case 11 and has an air intake port 13i that is the most upstream portion of the upstream side intake passage 13 in the direction in which cool air can be easily taken, for example, toward the front side of the vehicle. While being opened, an air intake passage 13 is formed on the upstream side that is integrated with the air cleaner case 11 and communicates with the inside of the air cleaner case 11.

  Further, the downstream side intake pipe 16 has an insertion pipe portion 18 inserted into the air cleaner case 11 and a connection intake pipe 19 connected to the insertion pipe portion 18 and connected to the throttle body side of the engine. The downstream side return passage portion 14b is formed by the insertion pipe portion 18.

  Specifically, the upstream folded passage portion 13 b of the upstream intake passage 13 is formed inside the air cleaner case 11 by the air cleaner case 11 and the air cleaner element 12, and is inserted into the air cleaner case 11. The insertion pipe portion 18 passes through the intake passage 13 on the upstream side inside the air cleaner case 11.

  Further, as shown in FIGS. 1 and 4, the folded-back passage portion 13b on the upstream side extends over the entire width W inside the air cleaner case 11, that is, wide enough to cover the entire width of the air cleaner element 12 in the vertical direction in FIG. This is a passage, and the opening width of the upstream air intake port 13i of the intake passage 13 on the upstream side can also be set wide.

  As shown in FIGS. 2 and 3, the air cleaner case 11 partitions the space 17 formed as a part of the downstream folded passage portion 14 b on the other surface 12 d side of the air cleaner element 12 and the upstream intake passage 13. A partition wall 11p is provided, and a space 17 is defined by the partition wall 11p, the other surface 12d of the air cleaner element 12, and the outer wall 11v of the air cleaner case 11. The partition wall portion 11p is formed with a communication hole 11q that allows the space 17 and the downstream folded passage portion 14b inside the insertion tube portion 18 to communicate with each other. The insertion tube portion 18 has a partition wall at one end thereof. It is supported by the part 11p.

  However, as shown in FIG. 5, the downstream side intake pipe 16 entirely covers the insertion pipe portion 18 and the other surface 12d side of the air cleaner element 12, and defines a space 17 between the other surface 12d of the air cleaner element 12. The cover portion 18c formed may be integrated. In this case, since the insertion pipe portion 18 and the cover portion 18c partition the upstream intake passage 13 and the space 17 on the other surface 12d side of the air cleaner element 12, the partition wall portion 11p is not necessary, and the upstream side A part of the side passage portion 13 a of the intake passage 13 is formed by the cover portion 18 c of the insertion pipe portion 18. Further, the insertion pipe portion 18 can be a unit that can be handled integrally with the air cleaner element 12 by fitting the cover portion 18c to the outer peripheral frame 12b of the air cleaner element 12, for example.

  That is, the side passage portion 13a of the upstream side intake passage 13 has an air cleaner case when the side passage portion 13a and the space 17 on the other surface 12d side of the air cleaner element 12 are partitioned by a part of the air cleaner case 11. 11 and the air cleaner element 12 can be formed by at least the air cleaner case 11. When the upstream intake passage 13 and the space 17 on the other surface 12d side of the air cleaner element 12 are partitioned by the downstream intake pipe 16, the air cleaner case 11 and the air cleaner element 12 can be formed by at least the air cleaner case 11 and the downstream side intake pipe 16.

  On the other hand, as shown in FIGS. 1, 2, and 6, the air cleaner case 11 is formed with an insertion hole 11 h through which the downstream side intake pipe 16 is inserted. It has a bellows portion 18b that forms a downstream side passage portion 14a and can be expanded and contracted. A seal member 21 that closes the insertion hole 11 h around the downstream side intake pipe 16 is interposed between the air cleaner case 11 and the insertion pipe portion 18 of the downstream side intake pipe 16.

  As shown in FIG. 6, the seal member 21 includes an end 21a supported by the air cleaner case 11 and the other end 21b supported by the downstream side intake pipe 16, and a gap between the one end 21a and the other end 21b. And a flexible cylindrical body having an intermediate portion 21c curved so as to protrude in the radial direction, and is made of, for example, a thin resin elastic film or rubber elastic film. Note that the seal member 21 is not limited to a gently curved shape that spreads like a skirt as described above. For example, the intermediate portion 21c may have a bellows shape, or may be an intermediate portion in the lower half of FIG. The portion 21c may be made flexible to have a substantially S-shaped cross section.

  As shown in FIGS. 1 and 4, the upstream side intake pipe 15 and the downstream side intake pipe 16 are disposed on the same side surface with respect to the air cleaner element 12, and constitute a part of the upstream side intake passage 13. The upstream side passage portion 13a and the downstream side passage portion 14a that constitutes a part of the downstream intake passage 14 respectively pass through the intake air with respect to the air cleaner element 12 (the vertical direction in FIG. 1). ) And extend substantially parallel to. Here, the same side surface side may be either one end side in the longitudinal direction of the air cleaner element 12 or one side in the lateral direction.

  In addition, although the insertion pipe part 18 of the downstream side intake pipe 16 has the bellows part 18b covering substantially the entire region of the downstream side passage part 14a inside the air cleaner case 11 in FIGS. The pipe part 18 may have a cylindrical straight part by shortening the bellows part 18b or dividing it into a plurality of parts, and an intake air amount detection such as an air flow meter on the downstream side of the straight part. Means can be provided. Moreover, although the unevenness | corrugation of the bellows part 18b is exaggerated in each figure, the width | variety in the intake direction of the unevenness | corrugation and the height of radial direction are arbitrary, and the width | variety and height become partially large. It may be changed as follows.

  Next, the operation will be described.

  In the engine intake device of the present embodiment configured as described above, the flow of the intake air is folded twice before and after passing through the air cleaner element 12 by the upstream folded passage portion 13b and the downstream folded passage portion 14b. Therefore, the length of the intake passage in the direction in which the intake air flows into and out of the air cleaner case 11 is shortened by the amount of the upstream return passage portion 13b and the downstream return passage portion 14b. Thus, the overall length of the intake device can be shortened. Therefore, it becomes a compact intake device with reduced mounting space.

  Further, since the downstream side passage portion 14a and the upstream side passage portion 13a located in the vicinity of the air cleaner element 12 are substantially straight and have an intake passage having a certain length, these The flow of the intake air can be rectified inside the side passage portions 13a and 14a. That is, the side passage portions 13a and 14a, for example, the downstream side passage portions 14a, can sufficiently secure a rectifying passage length suitable for intake air amount detection.

  Therefore, the engine intake device of the present embodiment can provide a compact engine intake device while ensuring a sufficient rectifying passage length suitable for intake air amount detection and the like.

  In addition, in the present embodiment, the air passing through the air cleaner element 12 reaches the air cleaner element 12 through the large air intake port 13i and the intake passage 13 on the upstream side having a large cross-sectional area, thereby forming a flow of intake air with reduced pressure loss. can do. In addition, since the upstream side passage portion 13a and the downstream side passage portion 14a each extend substantially in parallel with the passage direction of the intake air with respect to the air cleaner element 12, both side passage portions 13a, 14a has a substantially constant cross-sectional area and cross-sectional shape at these straight portions, and in combination with securing of a constant rectifying section, an intake device with reduced pressure loss can be obtained.

  Furthermore, in the present embodiment, the downstream side intake pipe 16 has the insertion pipe part 18 inserted into the air cleaner case 11, and the insertion pipe part 18 forms the downstream folded passage part 14b. Compared to the case where two ducts are inserted into the air cleaner case 11, the cross-sectional area of the intake passage 13 on the upstream side can be sufficiently secured inside the air cleaner case 11. Further, the proximity portion between the upstream side intake pipe 15 and the downstream side intake pipe 16 is covered with the air cleaner case 11, so that it is not necessary to make a large undulation at the outer surface of the intake device. In addition, the degree of freedom of the installation posture of the upstream side intake pipe 15 and the downstream side intake pipe 16 is also high.

  In the present embodiment, the insertion pipe portion 18 passes through the intake passage 13 on the upstream side inside the air cleaner case 11, so the upstream intake pipe 15 and the downstream intake pipe 16 with respect to the air cleaner element 12. Can be arranged on the same side to provide a compact and simple intake device. Further, since the cross section of the upstream intake passage 13 can be expanded to the vicinity of the inner wall of the air cleaner case 11 around the insertion pipe portion 18, the cross sectional area of the upstream intake passage 13 can be sufficiently secured.

  In addition, since the upstream folded passage portion 13b is formed inside the air cleaner case 11 by the air cleaner case 11 and the air cleaner element 12, the upstream folded passage portion 13b is formed between the air cleaner case 11 and the air cleaner element 12. In addition to being able to form easily, the passage cross-sectional area of the upstream intake passage 13 can be sufficiently secured, and the device configuration can be simplified.

  In addition, an insertion hole 11h through which the downstream side intake pipe 16 is inserted is formed in the air cleaner case 11, and the insertion pipe part 18 can be expanded and contracted by the bellows part 18b, so that the air cleaner case 11 and the downstream side intake pipe 16 are interposed. Since the seal member 21 that closes the insertion hole 11h is interposed around the downstream side intake pipe 16, the relative position change and the relative posture between the engine and the air cleaner 10 when the engine shakes or vibrates. The upstream intake passage 13 can be reliably sealed from the outside of the air cleaner case 11 while the downstream intake pipe 16 can reliably absorb the change. Therefore, hot air in the engine compartment is reliably prevented from being sucked into the intake passage 13 on the upstream side from the outside of the air cleaner case 11.

  Further, since the seal member 21 is made of a flexible cylindrical body having one end portion 21a supported by the air cleaner case 11 and the other end portion 21b supported by the downstream side intake pipe 16, vibration and vibration of the engine are prevented. The change in the relative posture between the engine and the air cleaner 10 when it occurs can be absorbed more reliably. Moreover, the sealing member 21 has not only a sealing function for closing the insertion hole 11h but also a function for following the expansion / contraction direction and swinging direction of the downstream side intake pipe 16 and a function for returning to the initial shape. Therefore, the function of facilitating the return of the insertion pipe portion 18 of the downstream side intake pipe 16 from the swinging state or the expansion / contraction state to the initial shape is also exhibited.

  As described above, in the present embodiment, a compact engine intake device capable of reducing the mounting space while sufficiently securing a passage for rectifying the flow of the air to be taken in, and further suppressing the pressure loss is provided. can do.

(Second Embodiment)
7 and 8 show the main part of an intake system for an engine according to a second embodiment of the present invention. Note that this embodiment has the same configuration as that of the above-described first embodiment except for the configuration of the downstream side intake pipe and the seal member. Only the differences from the first embodiment will be described in detail below.

  As shown in FIGS. 7 and 8, the engine intake device of the present embodiment includes a downstream side intake pipe 36 that is inserted into the insertion hole 11 h of the air cleaner case 11, and the downstream side intake pipe 36 includes: The shape of the one end side portion inserted into the air cleaner case 11 is substantially the same as that of the insertion tube portion 18 of the first embodiment, and the other end portion of the insertion tube portion 38 is integrally mounted. A seal member 41.

  That is, the insertion pipe part 38 is connected to the partition wall part 11p inside the air cleaner case 11, thereby forming the downstream intake passage 14 having the space 17 as a part thereof. Further, it has a bellows portion 38b that forms the downstream side passage portion 14a and can be expanded and contracted, or has a cylindrical straight portion 38a on the upstream side of the bellows portion 38b.

  The seal member 41 has a skirt shape that extends toward the air cleaner case 11 and is integrally fixed to the other end portion of the insertion pipe portion 38, and the insertion pipe portion 38 of the air cleaner case 11 and the downstream side intake pipe 36. The insertion hole 11h is closed around the downstream side intake pipe 36.

  Here, the seal member 41 is uneven in the radial direction between the one end 41a supported by the air cleaner case 11 and the other end 41b supported by the downstream side intake pipe 36, and between the one end 41a and the other end 41b. And a flexible cylindrical body having a bellows-shaped intermediate portion 41c, for example, made of a thin resin elastic film or rubber elastic film.

  Further, the connection intake pipe 19 is fitted into the downstream intake pipe 36, and the downstream intake passage 14 communicates with each intake port of the engine.

  Also in the present embodiment, the flow of the intake air is folded twice by the upstream folded passage portion 13b and the downstream folded passage portion 14b so as to make a large turn inside the air cleaner case 11 while passing through the air cleaner element 12. The intake passage length in the direction in which the intake air flows into and out of the air cleaner case 11 is shortened by the upstream folded passage portion 13b and the downstream folded passage portion 14b. The overall length of the intake air can be shortened, and the flow of intake air with reduced pressure loss can be formed. Further, since the downstream side passage portion 14a and the upstream side passage portion 13a located in the vicinity of the air cleaner element 12 are substantially straight and are intake passages having a certain length, By the side passage portions 13a and 14a, for example, the downstream side passage portion 14a, it is possible to sufficiently secure a rectifying passage length suitable for intake air amount detection. Therefore, the engine intake device of the present embodiment also provides a compact engine intake device with reduced pressure loss while ensuring a sufficient rectifying passage length suitable for intake air amount detection and the like. Can do.

  Furthermore, in the present embodiment, the downstream side intake pipe 36 is a flexible pipe in which the insertion pipe portion 38 and the seal member 41 are integrated, so that the engine and the air cleaner are not affected when the engine shakes or vibrates. Not only can the change in the relative position and the relative posture be reliably absorbed, but also the assembling workability of the downstream side intake pipe 36 and the durability of the seal member 41 can be improved.

  In each of the above-described embodiments, the air cleaner element 12 has a substantially rectangular air passage shape as shown in FIG. 4. However, the necessary passage cross-sectional area of the folded-back passage portion 13 b on the upstream side can be secured. In this case, for example, a part of the air cleaner element 12 (for example, within the range of the width w1 in FIG. 4) is close to the insertion pipe portion 18 outside the opening area of the air intake port 13i of the upstream intake passage 13 in FIG. Alternatively, a part of the air cleaner element 12 may protrude to the left side in the figure until it reaches the inner wall surface of the air cleaner case 11 so as to surround the insertion tube portion 18 in the same region.

  In each of the above-described embodiments, the insertion tube portions 18 and 38 have the bellows portions 18b and 38b. However, the insertion tube portions 18 and 38 can extend and contract with a portion that can be bent partially like a joint (for example, a short bellows portion). It may have a double pipe part which slides mutually.

  Further, in each of the above-described embodiments, the side passage portion 13a of the upstream intake passage 13 and the side passage portion 14a of the downstream intake passage 14 are disposed on the same side of the air cleaner element 12. Each of the air cleaner elements 12 is directed substantially parallel to the direction of passage of the intake air. However, the position and direction of the upstream air intake port 13i of the upstream intake passage 13 are arbitrary, and the upstream side The side passage portion 13a and the downstream side passage portion 14a may not be parallel to each other. Further, the insertion pipe portions 18 and 38 do not necessarily have to be inserted into the upstream intake passage 13. On the other hand, a passage arrangement in which the central axes of the upstream side passage portion 13a and the downstream side passage portion 14a coincide is possible.

  As described above, the engine intake device according to the present invention provides a compact engine intake device that can reduce the mounting space while sufficiently securing a passage for rectifying the flow of the intake air. This is advantageous in that it is useful for an engine intake device, particularly an engine intake device having an air cleaner disposed upstream of an intake port of an internal combustion engine.

DESCRIPTION OF SYMBOLS 10 Air cleaner 11 Air cleaner case 11a, 11b Case member 11h Insertion hole 11p Partition wall part 11q Communication hole 11v Outer wall part 12 Air cleaner element 12a Filter material 12b Outer frame (outer peripheral part)
12c One side (One side of air cleaner element)
12d Other side (Other side of air cleaner element)
13 upstream intake passage 13a upstream side passage portion 13b upstream return passage portion 13i air intake port 14 downstream intake passage 14a downstream side passage portion 14b downstream return passage portion 15 upstream intake air Pipe 16 Downstream intake pipe 17 Space 18, 38 Insertion pipe part 18b, 38b Bellows part 18c Cover part 19 Connected intake pipe 21, 41 Seal member 21a, 41a One end part 21b, 41b Other end part 21c, 41c Intermediate part 36 Downstream side Intake pipe 38a Straight section

Claims (8)

An air cleaner in which an air cleaner element is housed inside an air cleaner case;
An engine having an upstream intake pipe and a downstream intake pipe connected to the air cleaner case and forming an intake passage upstream of the air cleaner element and an intake passage downstream of the air cleaner element together with the air cleaner case, respectively. In the intake system of
The upstream side intake passage is located in the vicinity of the outer peripheral portion of the air cleaner element, and the upstream side return passage is directed from the upstream side passage portion toward one surface of the air cleaner element. And
The downstream intake passage includes a downstream side passage portion located in the vicinity of the outer peripheral portion of the air cleaner element, and a downstream side passage portion from the other surface side of the air cleaner element toward the downstream side passage portion. a folded passage portion, and having a,
The downstream side intake pipe has an insertion pipe portion inserted into the air cleaner case;
An intake device for an engine, wherein the insertion pipe portion forms the downstream folded passage portion . The engine intake device according to claim 1, wherein the insertion pipe portion passes through the intake passage on the upstream side inside the air cleaner case. The engine intake device according to claim 2, wherein the upstream turn-back passage portion is formed inside the air cleaner case by the air cleaner case and the air cleaner element. An insertion hole for inserting the downstream side intake pipe is formed in the air cleaner case,
The insertion tube portion is configured to be extendable and contractible,
The seal member which closes the insertion hole around the downstream intake pipe is interposed between the air cleaner case and the downstream intake pipe. The engine intake device according to any one of claims. The engine intake device according to claim 4, wherein the insertion tube portion has a bellows portion, and the bellows portion forms the downstream side passage portion. The said sealing member consists of a flexible cylindrical body which has the one end part supported by the said air cleaner case, and the other end part supported by the said downstream side intake pipe. The engine intake system described in 1. The said upstream intake pipe and the said downstream intake pipe are arrange | positioned at the same side surface with respect to the said air cleaner element, The claim of any one of Claim 1 thru | or 6 characterized by the above-mentioned. Engine intake system. 8. The upstream side passage portion and the downstream side passage portion each extend substantially parallel to a passage direction of intake air with respect to the air cleaner element. Engine intake system.

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