JP3804207B2 - Intake device for internal combustion engine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an intake device for an internal combustion engine in which an air cleaner, an intake manifold, and the like are integrated.
[0002]
[Prior art]
Conventionally, a method of integrating intake system components of an internal combustion engine (engine) for a vehicle is known. For example, Japanese Patent Laid-Open No. 8-334070 discloses an “intake device for an internal combustion engine” in which an air cleaner, a throttle, a surge tank, an intake manifold, and the like are integrated. By integrating the components of the intake device in this way, the number of parts and the number of assembling steps can be reduced, and the space can be reduced.
[0003]
[Problems to be solved by the invention]
Incidentally, the intake device disclosed in the above-mentioned JP-A-8-334070 is attached to the engine formed at the end of the intake manifold, as is apparent from the exploded perspective view shown in FIG. The part is formed at a position where it does not interfere with the dusty side case of the air cleaner part. As described above, when a bolt is inserted and tightened in the mounting portion to the engine, the installation position of the air cleaner portion must be determined while securing the working space, and in arranging the air cleaner portion which is the intake passage. There are many restrictions. For example, if the air cleaner part of the intake device disclosed in the above-mentioned publication is lowered and arranged on the intake manifold side, the bolt insertion hole formed in the attachment part of the intake manifold is hidden by the air cleaner part. Space cannot be secured and it is difficult to assemble the engine in an integrated structure. The same applies to the case where the air cleaner elements housed in the air cleaner portion are arranged in the vertical direction, and the vertical direction of the air cleaner portion becomes longer, so that the above-described working space may not be ensured depending on the arrangement of the air cleaner portion. Thus, there are many restrictions when trying to form an air cleaner portion as an intake passage while securing a working space, which hinders further space saving of the entire intake device.
[0004]
The present invention was created in view of the above points, and an object thereof is to provide an intake device for an internal combustion engine in which the formation position of the intake passage can be freely set.
[0005]
[Means for Solving the Problems]
In order to solve the above-described problem, in the intake device for an internal combustion engine according to the present invention, the attachment portion of the intake manifold is provided on the wall surface of the intake passage, and an insertion hole for attachment means of the attachment portion is formed in the intake passage. The insertion hole is closed by the attaching means. Therefore, the working space necessary for attaching the attachment portion to the internal combustion engine by the attachment means and the intake passage can be arranged so as to overlap each other, the formation position of the intake passage can be freely set, and the intake passage can be routed. The degree of freedom is improved. In addition, since the insertion hole formed in the intake passage is closed by the working means, air leakage through the insertion hole can be prevented without attaching a special cover, and airtightness is maintained.
[0006]
Further, it is preferable that a through hole necessary for operating the mounting means is formed on the wall surface of the intake passage facing the insertion hole for the mounting means described above, and the through hole is closed with a lid member. Thus, air leakage from the through hole can be prevented by closing the through hole for securing the work space with the lid member. In particular, the through hole is preferably formed on the upstream side of the intake air from the air cleaner element. When formed on the upstream side, the airtightness in the through hole is insufficient, and even if external air flows in, dust contained in the inflowing air can be filtered by the air cleaner element.
[0007]
Further, the above-described through hole for operating the attachment means formed in the wall surface of the intake passage may be closed by an air cleaner element (including a guide for storing the same). In this case, there is no need for additional parts to close the through hole, and the number of parts can be reduced.
Further, the attachment portion can be formed integrally with the wall surface of the intake passage. For example, integral molding with resin is possible.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
An intake device for an engine according to an embodiment to which the present invention is applied is characterized in that an air cleaner case is formed integrally with an attachment portion to the engine, and bolts are tightened through a through hole opened in the air cleaner case. In the present specification, the work space necessary for performing the tightening operation of the bolts and nuts when attaching the attachment portion at the end of the intake manifold to the engine will be referred to as “tool space”. Hereinafter, an engine intake device according to an embodiment to which the present invention is applied will be described in detail with reference to the drawings.
[0009]
FIG. 1 is a diagram showing a structure of an intake device for an engine according to an embodiment to which the present invention is applied. 2 is a cross-sectional view taken along line II-II shown in FIG. As shown in FIGS. 1 and 2, the intake device of the present embodiment includes an air cleaner portion 10 that removes dust contained in air sucked from the intake port 12, and a mounting portion 22 that attaches the intake device to the engine 90. An intake manifold 20 formed at one end, a surge tank 30 provided at the other end of the intake manifold 20, a throttle 40 attached to the center of the surge tank 30, and the throttle 40 and the air cleaner unit 10 are connected. And a passage 50.
[0010]
The air cleaner 10 includes an air cleaner element 14 made of a nonwoven fabric or filter paper, a guide 16 for mounting and storing the element, and an air cleaner that forms a dusty side space on the upstream side of the air cleaner element 14 and a clean side space on the downstream side. A case 18 is included. The air introduced into the dusty side space through the intake port 12 is removed from the dust by passing through the air cleaner element 14 and introduced into the clean side space. The guide 16 is slidable in the vertical direction with respect to the air flow through the air cleaner element 14 and can be attached and detached. When the guide 16 is attached to the air cleaner portion 10, a seal member (described later) is formed on the outer periphery thereof. ) To maintain an airtight state with the air cleaner case 18. Further, the guide 16 has a function as a cover that covers the mounting opening formed in the air cleaner case 18 without any gap, and prevents the air from flowing into the dusty side space through the opening. ing.
[0011]
The passage 50 is a cylindrical member that is integrated with the clean side of the air cleaner unit 10 and guides the air that has been passed through the clean side space through the air cleaner element 14 to the surge tank 30 via the throttle 40. is there. The throttle 40 includes a throttle valve and a throttle body, and adjusts the amount of air sucked into each cylinder row of the engine. Further, a pressure sensor 46 for detecting the pressure in the throttle and a position sensor 48 for detecting the opening of the throttle valve are attached to the throttle 40, and the output of each sensor is an engine control unit (ECU) (not shown). Is input.
[0012]
The surge tank 30 has a box shape. The above-described throttle 40 is attached to the center of one surface of the box shape, and air flows into the surge tank 30 via the throttle 40. An intake manifold 20 is attached to the other surface of the box shape, and air in the surge tank 30 is drawn into the intake manifold 20. Thus, by setting the throttle 40 to the center of the surge tank 30, it is possible to improve the tone of the intake noise and improve the cylinder distribution efficiency.
[0013]
The intake manifold 20 is for introducing the air after the dust introduced through the surge tank 30 is removed into each cylinder row of the engine 90, and is composed of branch pipes 24 of the same number as the number of cylinders of the engine. Has been. For example, the engine 90 to which the intake device of the present embodiment is attached has four cylinders, and the intake manifold 20 is constituted by four branch pipes 24. An attachment portion 22 for attaching the intake device to the engine 90 is formed at the tip of each branch pipe 24 (the end opposite to the surge tank 30). A bolt insertion hole 26 provided in the attachment portion 22 is formed in the attachment portion 22. The intake device is attached to the engine 90 by tightening it through the bolts 28 as attachment means. Further, each branch pipe 24 of the intake manifold 20 is laid to meander a predetermined amount in the cylinder row direction of the engine from the mounting portion 22 toward the surge tank 30.
[0014]
The air taken into the dusty side space of the air cleaner unit 10 from the intake port 12 passes through the air cleaner element 14 accommodated in the guide 16 so that dust is removed and guided to the clean side space. Further, the intake air passes through the passage 50 and then flows into the surge tank 30 through the throttle 40. The surge tank 30 distributes the inflow air to the four branch pipes 24 of the intake manifold 20, and the distributed air is supplied to the engine cylinders through the branch pipes 24. The intake amount of air in each cylinder of the engine 90 is controlled by the opening degree of the throttle valve in the throttle 40. In addition, an injector (not shown) is attached to the engine 90 so as to correspond to each cylinder, and fuel (gasoline) injected from the injector is mixed with air sucked into each cylinder of the engine from the intake manifold 20. .
[0015]
The air cleaner portion 10 included in the intake device of the present embodiment is formed so as to partially overlap the intake manifold 20, and an air cleaner case 18 as an intake passage forming member is integrally formed with the attachment portion 22 of the intake manifold 20. These are integrated. Therefore, the air cleaner 10 is disposed at a position where the bolt insertion hole 26 formed in the attachment portion 22 is shielded, and the air cleaner 10 is attached to secure the tool space of the bolt 28 inserted into the shielded bolt insertion hole 26. A through hole is formed in the wall surface of the air cleaner case 18 on the side opposite to the portion 22. Thus, the mounting portion 22 is provided on the wall surface of the air cleaner case 18 as an intake passage, and the bolt insertion hole 26 is formed so as to penetrate the wall surface, that is, the mounting portion 22 from within the air cleaner case 18. Yes.
[0016]
FIG. 3 is a view for explaining a tool space in the intake device of the present embodiment. A total of ten bolt insertion holes 26 are formed in the mounting portion 22, and as shown in FIG. 1, eight of them are exposed to the outside without interfering with the air cleaner portion 10. Therefore, a tool space is secured between the branch pipes 24 of the intake manifold 20 with respect to the eight bolt insertion holes 26 exposed, and the bolts 28 are rotated by rotating their heads after passing the bolts 28. Can be tightened.
[0017]
Further, the two bolt insertion holes 26 located on the leftmost side in FIG. 1 are covered with an air cleaner portion 10 integrated with the mounting portion 22, and an air cleaner case facing these two bolt insertion holes 26. A through-hole 100 for securing a tool space indicated by a region a in FIG. 3 is formed on the 18 wall surfaces. Accordingly, these two bolt insertion holes 26 are passed through the bolts 28 through the through holes 100 formed in the air cleaner case 18, and then the heads are rotated through the through holes 100 to rotate the bolts 28. Can be tightened.
[0018]
After the bolts 28 have been tightened in this way, the lid member 102 is attached to the through hole 100 formed in the air cleaner case 18. The lid member 102 is formed of, for example, a grommet using a rubber material, and the lid member 102 is attached by fitting a groove formed on the outer periphery of the grommet to the inner peripheral end of the through hole 100. Note that the two bolt insertion holes 26 are closed by bolts 28. Thereby, the holes 26 and 100 formed in the air cleaner case 18 in relation to the bolts 28 are closed, and a necessary seal is realized.
[0019]
FIG. 4 is a view showing the shape of the guide 16 that houses the air cleaner element 14. FIG. 5 is a partial cross-sectional view showing a seal structure between the guide 16 and the air cleaner case 18 shown in FIG. As shown in these drawings, a seal member 104 formed of an elastic member such as rubber is attached to the outer periphery of the clean side end portion of the guide 16, and this seal member 104 is attached to the inner wall surface of the air cleaner case 18. By contacting the formed recess 106, the airtightness between the guide 16 and the air cleaner 18 is maintained.
[0020]
Further, in the air cleaner case 18, the through hole 100 formed for securing the tool space is formed on the dusty side space side upstream from the formation position of the recess 106 described above. For this reason, even if the through hole 100 is not completely closed by the lid member 102 and air flows in from the gap, the air containing the dust is filtered by the air cleaner element 14, so there is no particular inconvenience. . Therefore, it is not necessary to strictly seal the through hole 100 with the lid member 102, and the lid member 102 and the through hole 100 can be designed with rough dimensional accuracy, or the lid member 102 can be manufactured with an inexpensive material.
[0021]
As described above, the air intake apparatus of the present embodiment has the bolt insertion hole 26 of the mounting portion 22 in the air cleaner case 18 that forms the intake passage, and the wall surface of the air cleaner case 18 that faces the bolt insertion hole 26. Since the through hole 100 for securing the tool space is formed, the bolt 28 can be tightened through the through hole 100. Therefore, even when the air cleaner portion 10 is formed so as to overlap with the attachment portion 22, a tool space necessary for attaching the intake device to the engine 90 can be secured. In other words, the formation position of the air cleaner portion 10 can be freely set without worrying about interference with the mounting portion 22 provided at the end portion of the intake manifold 20, and the degree of freedom in handling can be improved. it can. For example, conventionally, the air cleaner unit 10 is disposed on the opposite side of the surge tank 30 with the mounting unit 22 in consideration of interference with the mounting unit 22, but the air cleaner unit 10 is overlapped with the mounting unit 22. If it can be arranged, it is possible to save space, and the intake device can be reduced in size.
[0022]
FIG. 6 is a view showing a modified example of the guide 16. FIG. 7 is a partial cross-sectional view showing a seal structure between the guide 16 and the air cleaner case 18 shown in FIG. As shown in these drawings, a seal member 108 formed of an elastic member such as rubber is attached in the vicinity of the outer periphery of the end surface on the clean side of the guide 16. The seal member 108 is attached to the inner wall surface of the air cleaner case 18. By abutting on the convex portion 110 formed in the above, airtightness between the guide 16 and the air cleaner portion 18 is maintained.
[0023]
FIG. 8 is a view showing another modification of the guide 16. FIG. 9 is a partial sectional view showing a seal structure between the guide 16 and the air cleaner case 18 shown in FIG. As shown in these drawings, a seal member 112 is attached in the vicinity of the outer periphery of the guide 16 so as to surround the through hole 100 formed in the air cleaner case 18 and the lid member 102 attached thereto. A space adjacent to 100 is separated from both the dusty side space and the clean side space of the air cleaner unit 10. Therefore, even when a gap is generated between the through hole 100 and the lid member 102, it is possible to prevent air flowing from the gap from being mixed into the air in the dusty side space and the clean side space. .
[0024]
FIG. 10 is a view showing another modification of the guide 16. FIG. 11 is a partial sectional view showing a seal structure between the guide 16 and the air cleaner case 18 shown in FIG. As shown in these drawings, a seal member 114 having a concave portion inside is attached to the inner wall surface of the air cleaner case 18, and a convex portion 116 formed on the outer periphery of the clean side end portion of the guide 16 is formed in the concave portion. By fitting, the airtightness between the guide 16 and the air cleaner case 18 is maintained. Thus, the seal member 114 may be attached to the air cleaner case 18 side. Alternatively, the seal member 108 shown in FIG. 7 may be attached to the convex portion 110 side of the air cleaner case 18 to maintain the airtightness between the guide 16 and the air cleaner case 18.
[0025]
FIG. 12 is a view showing another modification of the guide 16. 13 is a partial cross-sectional view showing a seal structure between the guide 16 and the air cleaner case 18 shown in FIG. A wide seal member 120 having a convex portion 118 at a position corresponding to the through hole 100 formed in the air cleaner case 18 is attached to the outer peripheral surface of the guide 16. When the guide 16 is attached to a predetermined position of the air cleaner unit 10, the outer peripheral surface of the seal member 120 is pressed against the inner peripheral surface of the air cleaner case 18, and the convex portion 118 of the seal member 120 is formed in the through hole 100 of the air cleaner case 18. It is press-fitted from the inside so as to fill. Therefore, the airtightness between the guide 16 and the air cleaner case 18 is maintained without attaching the lid member 102 to the through hole 110.
[0026]
Thus, various modifications can be considered for the seal structure that maintains the airtightness between the guide 16 and the air cleaner case 18. In particular, as shown in FIG. 12, in order to block the through-hole 100 when the sealing member 120 attached to the outer peripheral portion of the guide 16 is made airtight by closing the through-hole 100 of the air cleaner case 18. Therefore, the number of parts can be reduced.
[0027]
In addition, this invention is not limited to the said embodiment, A various deformation | transformation implementation is possible within the range of the summary of this invention. For example, in the above-described embodiment, the case where a part of the intake manifold 20 and the air cleaner unit 10 overlap has been described. However, the air cleaner unit 10 may overlap the substantially entire intake manifold 20. Further, in the above-described embodiment, the bolt 28 is considered as the attachment means of the attachment portion 22, but when an implanted bolt is attached to the engine 90, a nut may be used as the attachment means.
[0028]
Further, in the above-described embodiment, when the distance between the through hole 100 of the air cleaner case 18 and the bolt insertion hole 26 is long, the bolt 28 is inserted into the bolt insertion hole 26 in advance so as not to be separated. Thus, workability can be improved. For example, as shown in FIG. 14 (A), a washer 122 attached to the bolt 28 in an inseparable state is fitted into a recess 124 formed in the attachment part 22 so as to be integrated with the attachment part 22. The bolt 28 can be handled as a finished part. At the time of tightening, as shown in FIG. 14B, the head of the bolt 28 presses the end surface of the mounting portion 22 via the washer 122 or the like, and the bolt insertion hole 26 is closed.
[0029]
Further, the air cleaner case 18 and the attachment portion 22 may be formed as separate bodies and arranged in an overlapping manner. In such a case, through holes can be formed in the wall surface of the air cleaner case 18 and the mounting portion 22, respectively, and these can be used as bolt insertion holes. And the attachment part 22 and the air cleaner case 18 can be fastened together with a common volt | bolt, and the through-hole of the air cleaner case 18 can be obstruct | occluded with a volt | bolt also in this structure.
[Brief description of the drawings]
FIG. 1 is a diagram showing a structure of an intake device for an engine according to an embodiment to which the present invention is applied.
FIG. 2 is a cross-sectional view taken along line II-II shown in FIG.
FIG. 3 is a view showing a tool space when the intake device of the present embodiment is attached to an engine.
FIG. 4 is a view showing a seal member formed on an outer peripheral surface of a guide that houses an air cleaner element.
FIG. 5 is a partial cross-sectional view showing a seal structure between a guide and an air cleaner case shown in FIG.
FIG. 6 is a view showing a modification of the guide.
7 is a partial cross-sectional view showing a seal structure between a guide and an air cleaner case shown in FIG.
FIG. 8 is a view showing another modification of the guide.
9 is a partial cross-sectional view showing a seal structure between a guide and an air cleaner case shown in FIG.
FIG. 10 is a view showing another modification of the guide.
11 is a partial cross-sectional view showing a seal structure between a guide and an air cleaner case shown in FIG.
FIG. 12 is a view showing another modification of the guide.
13 is a partial cross-sectional view showing a seal structure between a guide and an air cleaner case shown in FIG.
FIG. 14 is a view showing a structure of an attachment portion of an intake manifold to which bolts are attached in a state where separation is impossible.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Air cleaner part 14 Air cleaner element 16 Guide 18 Air cleaner case 20 Intake manifold 22 Mounting part 26 Bolt insertion hole 28 Bolt 100 Through hole 102 Lid member 104 Seal member

Claims (2)

An attachment portion provided at the end of the intake manifold is provided on the wall surface of the intake passage, and an insertion hole through which the attachment means of the attachment portion is inserted is formed in the intake passage.
The insertion hole is closed by the attachment means ,
In the intake passage, a through-hole for operating the attachment means is formed on the intake passage wall surface facing the insertion hole formed in the attachment portion, and the through-hole is closed by a lid member,
An intake device for an internal combustion engine, wherein the through hole is formed in an intake passage wall surface upstream of intake air from an air cleaner element . An attachment portion provided at the end of the intake manifold is provided on the wall surface of the intake passage, and an insertion hole through which the attachment means of the attachment portion is inserted is formed in the intake passage.
The insertion hole is closed by the attachment means,
In the intake passage, a through hole for operating the attachment means is formed on the wall surface of the intake passage facing the insertion hole formed in the attachment portion, and the through hole is blocked by an air cleaner element. An internal combustion engine intake device.

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