JP3804218B2 - 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]
An intake device of an internal combustion engine (engine) mounted on a vehicle includes an air cleaner, a throttle, a surge tank, an intake manifold, and the like. When the driver depresses the accelerator pedal, the throttle valve opens in conjunction with the accelerator pedal, and the amount of intake air to the engine, that is, the amount of air-fuel mixture including fuel increases, and the engine output increases. In particular, recently, for the purpose of reducing the cost, reducing the number of parts, or reducing the weight, a method of integrating the components of the intake device or using a resin is known. For example, Japanese Patent Application Laid-Open No. 6-81735 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 assembly steps can be reduced, and space can be saved. Further, as disclosed in the above-mentioned publication, by disposing the throttle almost at the center of the surge tank, it is possible to improve the distribution of the intake air amount and to improve the tone of the intake sound.
[0003]
[Problems to be solved by the invention]
By the way, as described above, resin parts of the integrated intake device are being made of resin.For the throttle, in order to ensure the roundness of the contact surface of the throttle valve and prevent icing due to heating, Resinization was not easy. Therefore, it is conceivable that only the throttle is made of a metal material such as aluminum. However, if the throttle is made of a metal material, it becomes heavier, so a large load is applied to the plastic surge tank to which the throttle is attached, and the surge tank And the throttle is likely to vibrate. In particular, when the throttle is disposed at the approximate center of the surge tank, the throttle becomes the center of vibration and resonance phenomenon is likely to occur. When the resonance phenomenon occurs, each part such as the throttle valve and the intake manifold may be damaged, or an unpleasant sound source may be generated even if the damage does not occur. Although not limited to the case where the throttle is made of a metal material, the air flow is disturbed by the throttle valve on the downstream side of the throttle.
[0004]
The present invention was created in view of the above points, and an object of the present invention is to provide an intake device for an internal combustion engine that suppresses the occurrence of vibrations by increasing the rigidity of a surge tank.
[0005]
[Means for Solving the Problems]
In order to solve the above-described problem, an intake device for an internal combustion engine according to the present invention extends on a wall so as to cross the opening when an opening is formed on any wall of the surge tank. A reinforcing member is formed on the wall surface. When one side of the surge tank in which the opening is formed is reinforced by the reinforcing member, the rigidity of the surge tank is increased, and when another member that communicates with the surge tank through this opening is attached, Vibration due to resonance or the like caused by the weight of other components can be suppressed. In addition, since vibration is suppressed in this way, it is possible to reduce damage to parts and generation of sound caused by vibration.
[0006]
In particular, the reinforcing member described above is preferably a plate-like rib along the air flow in the opening. Since the air sucked or discharged through the opening flows along the plate-like ribs, the flow resistance is reduced without blocking the air flow by forming the reinforcing member having such a shape. Can do. In addition, when the flow of air flowing through the opening is disturbed, the flow of air flows along the plate-shaped rib as a reinforcing member, so that the surge tank is improved in rigidity and simultaneously flows through the opening. A rectifying effect on air can be provided.
[0007]
Moreover, it is preferable that a reinforcement member is comprised by the some rib which cross | intersected in the opening part. Although it is conceivable that the rigidity becomes the weakest in the opening, the rigidity in the vicinity of the opening can be particularly increased by crossing a plurality of ribs in the opening.
The reinforcing member described above is preferably formed so as to correspond to an opening serving as a communication port with the throttle body. When a throttle made of aluminum or the like is placed on a plastic surge tank, the throttle valve may be damaged if vibration occurs due to insufficient rigidity of the surge tank, but the rigidity of the wall to which this throttle is attached is reduced. Such damage can be prevented beforehand by raising the vibration and suppressing the vibration. In particular, when the opening described above is formed at the approximate center of the wall surface of the surge tank, a resonance phenomenon in which the vicinity of the opening is the center of vibration tends to occur due to the weight of the throttle, but the rigidity of the wall surface including the opening is reduced. As a result, excessive vibration associated with this resonance phenomenon can be prevented, and damage to the throttle valve and generation of sound can be prevented.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
An engine intake device according to an embodiment to which the present invention is applied increases the rigidity of a plastic surge tank by forming plate-like ribs on the wall surface of the surge tank in which an opening communicating with the throttle is formed. There is a feature. 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. FIG. 3 is a partially enlarged view of the vicinity of the throttle 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 a passage connecting the throttle 40 and the air cleaner unit 10 50.
[0010]
Each component of the intake device described above is integrated. For example, as shown in FIG. 2, housings 70 and 71 each including an air cleaner 10, an intake manifold 20 and a surge tank 30, and a cap 72 including the air cleaner 10 and a passage 50 are separately molded with resin. Are joined together with the throttle 40 by some method to integrate the whole intake system.
[0011]
Hereinafter, the configuration of each part of the above-described intake device will be described in detail. The air cleaner unit 10 includes an air cleaner element 14 made of nonwoven fabric or filter paper, a guide 16 for mounting and storing the element, and an air cleaner case that forms a dusty side space upstream of the air cleaner element 14 and a clean side space downstream. 18. 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 and detachable in a direction perpendicular to the air flow through the air cleaner element 14, and a seal member (not shown) formed on the outer peripheral portion when the guide 16 is attached to the air cleaner 10. The airtight state between the air cleaner case 18 and the air cleaner case 18 is maintained. Further, the guide 16 has a function as a cover that covers the mounting opening formed between the air cleaner case 18 and the air cleaner case 18 without gaps, and air flows into the dusty side space through the opening. Is blocking.
[0012]
The passage 50 is a cylindrical member that forms a part of the cap 72, and guides the air that has passed through the clean side space through the air cleaner element 14 to the surge tank 30 via the throttle 40.
The throttle 40 includes a throttle valve 42 and a throttle body 44, and adjusts the amount of air sucked into each cylinder row of the engine 90. In order to ensure dimensional accuracy such as the roundness of the throttle bore, the throttle valve 42 and the throttle body 44 are made of aluminum. As shown in FIG. 3, the throttle body 44 is formed with four attachment holes 82 through which the four rivets 80 for fastening the throttle body 44 to the surge tank 30 are passed. Further, a pressure sensor 46 for detecting the pressure in the throttle and a position sensor 48 for detecting the opening degree of the throttle valve 42 are attached to the throttle 40, and the output of each of these sensors is an engine control unit (ECU) (not shown). ).
[0013]
The surge tank 30 has a box shape formed by joining the housing 70 and the housing 71 by vibration welding or the like. The above-described throttle 40 is attached to the center of one surface of the box shape formed by the housing 71, and air flows into the surge tank 30 via the throttle 40. An intake manifold 20 is attached to the other surface of the surge tank 30 in the box shape, and air in the surge tank 30 is led to the intake manifold 20. As described above, the installation position of the throttle 40 is set to the center of the surge tank 30, so that the tone of the intake sound can be improved and the cylinder distribution can be improved. The detailed shape of the surge tank 30 will be described later.
[0014]
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 formed by the same number of branch pipes 24 as the number of cylinders of the engine 90. It is configured. For example, the engine 90 of this embodiment 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). Bolts are provided in through holes 26 provided in the attachment portion 22. The intake device is attached to the engine 90 by tightening it through (not shown). 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 90 from the attachment portion 22 toward the surge tank 30.
[0015]
FIG. 4 is a diagram showing details of a connecting portion between the throttle 40 and the surge tank 30. FIG. 5 is an enlarged sectional view taken along line VV in FIG. As shown in these drawings, an opening 32 serving as a communication port communicating with the throttle 40 is formed on one wall surface of the surge tank 30 and on the mounting surface of the throttle 40. In addition, plate-like ribs 34 and 36 each having three vertical and horizontal reinforcing members are formed on the wall surface where the opening 32 is formed so as to extend across the opening 32. One rib 34 formed in the horizontal direction (for example, the longitudinal direction of the surge tank 30 having a rectangular parallelepiped box shape) and the other rib 36 formed in the vertical direction are orthogonal to each other, and the opening 32 is formed. It is formed in a direction perpendicular to the wall surface of the formed surge tank 30. That is, the air flowing into the surge tank 30 from the throttle 40 flows in the vertical direction into the wall surface of the surge tank 30 in which the opening 32 is formed in the vicinity of the opening 32, and therefore, the rib 34 along the air flow. It can also be considered that and are formed. In this way, the plate-like ribs 34 and 36 are formed along the flow of air flowing in through the opening 32 so that the flow of the intake air is not blocked.
[0016]
FIG. 6 is an enlarged view of the vicinity of the opening 32 of the surge tank 30 shown in FIG. As shown in FIG. 6, each of the ribs 34 and 36 has a distal end extending in the opening 32 until it reaches the outer surface of the surge tank 30, and the plate pressure becomes thinner and sharper as it approaches each distal end. ing. Therefore, by adopting such an end shape, it is possible to further reduce the ventilation resistance against the intake air.
[0017]
The intake device of the present embodiment has such a structure, and the operation thereof will be described next. 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 cylinders of the engine 90 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 42 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 90 from the intake manifold 20. The
[0018]
As described above, in the intake device of the present embodiment, the throttle 40 is attached to substantially the center of the upper surface of the surge tank 30, and plate-like ribs 34 and 36 are provided almost entirely on the inner wall side of the attachment surface. Is formed. Therefore, the rigidity of the upper surface of the surge tank 30 that is the mounting surface of the throttle 40 can be increased, and vibration generated in the throttle 40 and the surge tank 30 can be suppressed. Further, since vibration is suppressed, it is possible to prevent damage to the throttle valve 42 and other parts caused by vibration, and to prevent generation of sound caused by vibration.
[0019]
In particular, when the throttle 40 is made of a metal such as aluminum, it becomes relatively heavy, but even when such a throttle 40 is mounted almost at the center of the surge tank 30, the rigidity of the mounting surface is increased. Accordingly, a resonance phenomenon in which the attachment position of the throttle 40 is the center of vibration hardly occurs, and excessive vibration at the time of resonance can be prevented.
[0020]
Further, the plate-like ribs 34 and 36 as the reinforcing members described above are formed along the flow of air sucked through the opening 32 of the surge tank 30, and the tip portion to which the sucked air hits gradually becomes thinner. Therefore, the ventilation resistance when the ribs 34 and 36 are formed can be reduced. Further, when the air flow through the throttle valve 42 is disturbed, there is also an effect of rectifying the air flow by the plate-like ribs 34 and 36, and an unpleasant sound generated when the air flow is disturbed. Occurrence can also be prevented.
[0021]
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 ribs 34 and 36 are formed on one surface of the surge tank 30 to which the throttle 40 is attached, but other surfaces having other openings (for example, each branch pipe 24 of the intake manifold 20). You may make it form the same rib on the surface in which the opening part which connects was formed. Further, although the ribs 34 and 36 are orthogonal to each other at the opening 32, the ribs 34 and 36 may intersect at a predetermined angle other than orthogonal or may intersect at a place other than the opening 32. Alternatively, the ribs 34 or 36 may be formed along one direction without intersecting each other. Further, the ribs 34 and 36 are formed only on one surface of the surge tank 30 in which the opening 32 is formed, but in addition to this, a plate-like shape as a reinforcing member is formed on the other surface in which the opening 32 is not formed. You may make it add a rib.
[0022]
Further, the intake device of the above-described embodiment has been described in the case where the injector for injecting fuel into each cylinder of the engine 90 is not included, that is, the case where the injector is attached to the engine 90 side. It is good also as an intake device integrated with an injector.
Further, in the above-described embodiment, the intake device in which the air cleaner unit 10, the intake manifold 20, the surge tank 30 and the like are integrated has been described, but the surge tank is not necessarily integrated with other components. Manufacture and assembly may be performed as a single component. Moreover, although the case where the ribs 34 and 36 were shape | molded integrally with the surge tank 30 was demonstrated, you may make it join after shape | molding separately.
[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 partially enlarged view near the throttle shown in FIG. 2;
FIG. 4 is a diagram showing details of a connecting portion between a throttle and a surge tank.
5 is an enlarged sectional view taken along line VV in FIG. 4;
6 is an enlarged view of the vicinity of the opening of the surge tank shown in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Air cleaner part 20 Intake manifold 30 Surge tank 32 Opening part 34, 36 Rib 40 Throttle 42 Throttle valve 44 Throttle body 50 Passage

Claims (5)

An intake device for an internal combustion engine having a surge tank formed of a resin material,
Wherein the one wall of the surge tank, an opening, an intake system for an internal combustion engine, characterized in that the opening across the reinforcing member extending on the wall surface is formed. In claim 1,
The intake device for an internal combustion engine, wherein the reinforcing member is a plate-like rib along the air flow direction in the opening. In claim 1 or 2,
The intake device for an internal combustion engine, wherein the reinforcing member is constituted by a plurality of ribs intersecting at the opening. In any one of Claims 1-3,
The intake device for an internal combustion engine, wherein the opening is a communication port with a throttle body, and the throttle body is attached to the wall surface on which the opening is formed. In claim 4,
The intake device for an internal combustion engine, wherein the opening is formed at substantially the center of the wall surface.

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