JPH11107866A - Intake device for internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an intake device of an internal combustion engine to suppress the generation of vibration through improvement of vibration through the increase of rigidity of a surge tank. SOLUTION: An opening part 32 communicated with a throttle is formed in the mounting surface of a throttle being one of the wall surfaces of a surge tank 30. Three each of plate-form ribs 34 and 36 serving as a reinforcing member are formed in a lateral and a longitudinal direction, respectively, are formed as a reinforcing member integrally with the surface tank 30. The ribs 34 and 36 cross each other orthogonally, and formed in a direction extending along a flow of air sucked through the opening part 32. By the ribs 34 and 36, rigidity of the throttle mounting surface of the surge tanks 30 is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field 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]

2. Description of the Related Art Internal combustion engines (engines) mounted on vehicles
Is composed of 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, so that the engine output increases. In particular, recently, for the purpose of cost reduction, reduction of the number of parts, or weight reduction, a method of integrating each part of the intake device or converting it to resin has been known. For example, JP-A-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 manner, the number of components 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 substantially at the center of the surge tank, it is possible to improve the distribution of the intake air amount and to improve the timbre of the intake sound.

[0003]

By the way, although the components of the integrated intake device are being made of resin as described above, the roundness of the contact surface of the throttle valve is ensured for the throttle. In order to prevent icing due to heating, resinification 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, the throttle becomes heavier, so a large load is applied to the resin surge tank to which the throttle is attached, and the And the throttle becomes easy to vibrate. In particular, when the throttle is arranged substantially at the center of the surge tank, the resonance is likely to occur because the throttle becomes the center of vibration. When the resonance phenomenon occurs, each component such as the throttle valve and the intake manifold may be damaged, or may become a source of unpleasant noise even if it is not damaged. Although not limited to the case where the throttle is made of a metal material, the air flow is generally disturbed by the throttle valve on the downstream side of the throttle, which causes unpleasant noise.

The present invention has been made in view of the above points, and an object of the present invention is to provide an intake device for an internal combustion engine in which the generation of vibration is suppressed by increasing the rigidity of a surge tank.

[0005]

In order to solve the above-mentioned problem, an intake device for an internal combustion engine according to the present invention, when an opening is formed in any of the wall surfaces of a surge tank, removes the opening. A transversely extending reinforcing member is formed on this wall surface. Since one surface of the surge tank having the opening 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 the opening is attached, Vibration due to resonance or the like caused by the addition of the weight of other components can be suppressed. Further, since the vibration is suppressed in this way, it is possible to reduce the damage of parts and the generation of sound caused by the vibration.

In particular, it is preferable that the above-mentioned reinforcing member is a plate-shaped rib along the flow of air at the opening. Since the air sucked or discharged through the opening flows along the plate-like rib, the formation of the reinforcing member having such a shape does not obstruct the flow of the air and reduces the ventilation resistance. Can be. Also, if the flow of air flowing through the opening is disturbed, this air flow flows along the plate-like rib as a reinforcing member, so that the rigidity of the surge tank is increased and at the same time, the air flows through the opening. A rectifying effect on air can be provided.

Preferably, the reinforcing member is constituted by a plurality of ribs intersecting at the opening. It is conceivable that the rigidity is weakest at the opening, but by intersecting a plurality of ribs at the opening, the rigidity near the opening can be particularly increased. Further, it is preferable that the above-described reinforcing member is 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 mounted on a resin surge tank, the throttle valve may be damaged if vibration occurs due to insufficient rigidity of the surge tank. By raising the vibration to suppress the vibration, such damage can be prevented. In particular, when the above-described opening is formed substantially at the center of the wall surface of the surge tank, a resonance phenomenon in which the vicinity of the opening becomes the center of vibration easily occurs due to the weight of the throttle, but the rigidity of the wall surface including the opening is reduced. By raising, it is possible to prevent excessive vibration due to this resonance phenomenon, and to prevent damage to the throttle valve and generation of noise.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An engine intake device according to an embodiment of the present invention has a resin rib formed on a wall of a surge tank having an opening communicating with a throttle. The feature is to increase the rigidity of the surge tank. Hereinafter, an intake device for an engine according to an embodiment of the present invention will be specifically described with reference to the drawings.

FIG. 1 is a view showing the structure of an intake device for an engine according to an embodiment to which the present invention is applied. FIG. 2 is a sectional view taken along line II-II shown in FIG. FIG. 3 is a partially enlarged view near the throttle shown in FIG.
As shown in FIGS. 1 and 2, the intake device of the present embodiment includes an air cleaner unit 10 that removes dust contained in air taken in from an intake port 12 and a mounting unit 22 that attaches the intake device to an 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 at the center of the surge tank 30;
And a passage 50 connecting the air cleaner unit 10 and the air cleaner unit 10.

[0010] The components of the above-described intake device are integrated. For example, as shown in FIG.
, Housings 70 and 71, each of which includes an air intake manifold 20 and a surge tank 30, and an air cleaner unit 1.
The cap 72 including the zero and the passage 50 is separately molded with resin, and these are joined together with the throttle 40 by any method to integrate the entire intake device.

Hereinafter, the configuration of each part of the above-described intake device will be described in detail. The air cleaner section 10 includes an air cleaner element 14 made of nonwoven fabric or filter paper, a guide 16 for mounting and storing the air cleaner element 14, and an air cleaner case that forms a dusty side space upstream of the air cleaner element 14 and a clean side space downstream thereof. 18 are included. The air introduced into the dusty side space through the inlet 12 is cleaned of dust by passing through the air cleaner element 14 and is introduced into the clean side space. Further, the guide 16 is slidable in the vertical direction with respect to the flow of air through the air cleaner element 14 and can be attached and detached.
When the air cleaner case 18 is mounted, the airtight state between the air cleaner case 18 and the air cleaner case 18 is maintained by a seal member (not shown) formed on an outer peripheral portion thereof. Further, the guide 16 has a function as a cover that covers the mounting opening formed between the guide 16 and the air cleaner case 18 without any gap, and the air flows into the dusty side space through the opening. Has been blocked.

The passage 50 is a cylindrical member forming a part of the cap 72, and is for guiding the air passed through the air cleaner element 14 to the clean side space to the surge tank 30 through the throttle 40. The throttle 40 includes a throttle valve 42 and a throttle body 44, and adjusts the amount of air taken into each cylinder row of the engine 90. In order to ensure dimensional accuracy such as roundness of the throttle bore, the throttle valve 42 and the throttle body 44 are formed using aluminum. As shown in FIG. 3, the throttle body 44 is formed with four mounting holes 82 through which four rivets 80 for fastening the throttle body 44 to the surge tank 30 are passed. The throttle 40 is provided with a pressure sensor 46 for detecting the pressure in the throttle and a position sensor 48 for detecting the opening of the throttle valve 42. The outputs of these sensors are output from an engine control unit (ECU) (not shown). )
Is input to

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 constituted 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 a box shape, and air in the surge tank 30 is led out to the intake manifold 20. By setting the attachment position of the throttle 40 at the center of the surge tank 30 as described above, 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.

The intake manifold 20 includes a surge tank 3
This is for introducing the air from which the dust introduced through the cylinder 0 has been removed into each cylinder row of the engine 90, and is constituted by the same number of branch pipes 24 as the number of cylinders of the engine 90. For example, the engine 90 of the present embodiment is a four-cylinder engine, and the intake manifold 20 includes four branch pipes 24. At the tip (end opposite to the surge tank 30) of each branch pipe 24, a mounting portion 22 for mounting the intake device to the engine 90 is formed.
The intake device is attached to the engine 90 by tightening a bolt (not shown) through the through hole 26 provided in the engine 90. Each branch pipe 24 of the intake manifold 20 is laid in a meandering manner in the cylinder row direction of the engine 90 from the mounting portion 22 toward the surge tank 30 by a predetermined amount.

FIG. 4 shows the throttle 40 and the surge tank 3.
It is a figure which shows the detail of the connection part of 0. FIG. 5 is FIG.
FIG. 5 is an enlarged sectional view taken along line VV of FIG. As shown in these figures, one wall of the surge tank 30 and the throttle 4
An opening 32 as a communication port that communicates with the throttle 40 is formed in the mounting surface 0. In addition, this opening 3
On the wall surface where 2 is formed, plate-shaped ribs 34 and 36 each serving as a reinforcing member are formed so as to extend across the opening 32 in three rows and three rows. 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. The surge tank 30 is formed in a direction perpendicular to the wall surface of the surge tank 30. That is, the surge tank 3
0 flows into the opening 3 near the opening 32.
Since the ribs 2 flow into the wall surface of the surge tank 30 in which the ribs 2 are formed substantially vertically, it can be considered that the ribs 34 and 36 are formed along the flow of the air. in this way,
By forming the plate-shaped ribs 34 and 36 along the flow of the air flowing through the opening 32, the flow of the intake air is not deterred.

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 tip portion extending at the opening 32 until reaching the outer surface of the surge tank 30, and the plate pressure becomes thinner and sharper as it approaches the respective tip. ing. Therefore, by adopting such an end shape, the ventilation resistance to the intake air can be further reduced.

The intake device of the present embodiment has such a structure, and its operation will be described below. The air taken into the dusty side space of the air cleaner unit 10 from the inlet 12 passes through the air cleaner element 14 accommodated in the guide 16 to remove dust and is led to the clean side space. Further, the intake air flows into the surge tank 30 via the throttle 40 after passing through the passage 50. 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 respective cylinders of the engine 90 via the respective branch pipes 24. The amount of air taken into each cylinder of the engine 90 is controlled by the opening 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 drawn into each cylinder of the engine 90 from the intake manifold 20. You.

As described above, in the intake device of the present embodiment, the throttle 40 is mounted substantially at the center of the upper surface of the surge tank 30, and the plate-like ribs 34 are provided on almost the entire inner wall side of the mounting surface. , 36 are formed. Therefore, the rigidity of the upper surface of the surge tank 30, which 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 the vibration is suppressed, it is possible to prevent the throttle valve 42 and other components from being damaged due to the vibration, and to prevent the sound from being generated due to the vibration.

In particular, when the throttle 40 is made of a metal such as aluminum, the weight becomes relatively heavy. Even when such a throttle 40 is mounted almost at the center of the surge tank 30, the rigidity of the mounting surface is large. By raising the value, it becomes difficult for a resonance phenomenon in which the mounting position of the throttle 40 becomes the center of vibration to occur, and excessive vibration at the time of resonance can be prevented.

The plate-shaped ribs 34 and 36 as the above-mentioned reinforcing members are formed along the flow of the air sucked through the opening 32 of the surge tank 30. Since the ribs are gradually thinned, the ventilation resistance when the ribs 34 and 36 are formed can be reduced. When the air flow through the throttle valve 42 is disturbed, the plate-shaped ribs 34, 36
This also has the effect of rectifying the air flow, and can also prevent the generation of unpleasant noise that occurs when the air flow is disturbed.

Note that the present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the present 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, A similar rib may be formed on the surface where the communicating opening is formed). Further, although the ribs 34 and 36 are orthogonal to each other at the opening 32, they may intersect at a predetermined angle other than orthogonal or intersect at a place other than the opening 32. Alternatively, the ribs 34 or 36 may be formed along one direction without crossing each other. Although the ribs 34 and 36 are formed only on one surface of the surge tank 30 where the opening 32 is formed, a plate-like reinforcing member is formed on the other surface where the opening 32 is not formed. Ribs may be added.

In the above-described embodiment, the intake device does not include an injector for injecting fuel into each cylinder of the engine 90, that is, a case where an injector is mounted on the engine 90 side. An injector may be attached in the vicinity to form an injector-integrated intake device. Further, in the above-described embodiment, the air 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. However, the surge tank does not necessarily need to be integrated with other components. Production and assembly may be performed as a single component. Although the case where the ribs 34 and 36 are formed integrally with the surge tank 30 has been described, the ribs 34 and 36 may be formed separately and then joined.

[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 sectional view taken along line II-II shown in FIG.

FIG. 3 is a partial enlarged view near a throttle shown in FIG. 2;

FIG. 4 is a view showing details of a connection portion between a throttle and a surge tank.

FIG. 5 is an enlarged sectional view taken along line VV of FIG.

FIG. 6 is an enlarged view near the opening of the surge tank shown in FIG. 4;

[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)

[Claims] 1. An intake device for an internal combustion engine having a surge tank formed of a resin material, wherein an opening is provided on one of wall surfaces of the surge tank, and a reinforcing member extending across the opening. And an intake device for an internal combustion engine. 2. The intake device for an internal combustion engine according to claim 1, wherein the reinforcing member is a plate-shaped rib at the opening along the direction of air flow. 3. The intake device for an internal combustion engine according to claim 1, wherein the reinforcing member is constituted by a plurality of ribs intersecting at the opening. 4. The air conditioner according to claim 1, wherein the opening is a communication port with a throttle body, and the throttle body is attached to the wall surface where the opening is formed. Intake device for an internal combustion engine. 5. The intake device for an internal combustion engine according to claim 4, wherein the opening is formed substantially at the center of the wall surface.