JPH11107867A - Intake system and surge tank of internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To control vibrations in a throttle and an intake passage member by re-tightening a mounting member extending from an internal combustion engine together with a throttle body and an intake passage member by a clamping means connecting these elements, and locking the throttle and the intake passage member direct to the mounting member of the engine. SOLUTION: Two housings 70 and 71 comprising an air cleaner part 10, an inlet manifold 20 and a surge tank 30, and a cap 72 comprising the air cleaner part 10 a passage 50 are separately formed by resinication, and then these elements are joined together with a throttle 40, thereby unitizing an inlet system on the whole. At this time, a connecting part is formed in space between a throttle mounting surface of the surge tank 30 and a surface to be opposed to it, and a mounting hole piercing through the surge tank 30 is formed by each connecting part. In succession, the throttle 40 is set up in an upper part of the tank 30 like this, and a bracket 74 extended from an engine 90 in the lower part respectively, and then a bolt 80 is inserted from the side of the throttle 40, re-tightening it with a nut 84 from the side of the bracket 74.

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.

[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. The vibration of each of these components causes damage to each of the components and generates unpleasant noise. Therefore, it is preferable to suppress the vibration as much as possible. For this purpose, it is necessary to suppress the vibration of the heavy throttle itself.

[0004] Excessive vibration generated when a throttle made of a metal material is used is not limited to an integrated intake device, but also a surge tank manufactured alone and assembled to an engine. be able to. That is, when a single surge tank is formed of a resin material, and a throttle formed of aluminum or the like is attached thereto, a large vibration is generated by a large load caused by the throttle. In addition, although there is no direct relationship with the ease of vibration, when assembling the surge tank or throttle as a separate part to the engine, usually when installing the throttle to the surge tank, attach screws etc. from the throttle side It is necessary to carry out the tightening work, and the air cleaner and the like may interfere with this work space, so that the workability is not always satisfactory.

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 that can reduce vibration generated in a throttle. Another object of the present invention is to provide a surge tank capable of reducing vibration and improving workability of assembly.

[0006]

In order to solve the above-mentioned problems, an intake device for an internal combustion engine according to the present invention includes an internal combustion engine and a throttle body which are connected to each other by fastening means for connecting the throttle body and an intake passage member connected thereto. Since the mounting member extending from the engine is fastened together, and the throttle and the intake passage member are directly fixed to the mounting member of the internal combustion engine, vibration of the throttle and the intake passage member can be suppressed. Further, since the vibration is suppressed, it is possible to prevent the throttle valve and other parts from being damaged due to the vibration, or to generate an unpleasant sound due to the vibration.

Further, the above-mentioned intake passage member is a surge tank, and it is preferable to form an accommodating portion of the fastening means so as to penetrate therethrough. By penetrating the fastening means through this housing portion, the entire surge tank can be securely connected and fixed to a mounting member or a throttle extending from the internal combustion engine, and vibration generated in the surge tank or the throttle can be reduced. it can.

It is preferable that the connection by the above-mentioned fastening means is performed by arranging a mounting member extending from the internal combustion engine, a surge tank, and a throttle body in this order. In this way, by connecting the surge tank with the mounting member and the throttle body sandwiching the surge tank therebetween, vibration of the surge tank can be minimized. Especially,
By arranging the mounting member on the lowermost side, a surge tank and a throttle can be mounted and fixed thereon, and the intake device including the surge tank and the throttle can be easily mounted on the internal combustion engine.

Further, the surge tank of the present invention has a connecting portion for connecting between a throttle mounting surface and a surface facing the throttle mounting surface, and a through hole is formed in the connecting portion. Therefore, the throttle can be firmly fixed to the surge tank by attaching a throttle to the through-hole formed in this connection part through a bolt or the like, and furthermore, by forming such a connection part in the internal space of the surge tank, Since the rigidity of the surge tank increases, the generation of vibration can be reduced. Also, the surge tank and the throttle connected thereto are fixed by fastening together the brackets and the like extending from the internal combustion engine with the above-mentioned bolts, thereby further suppressing the vibration of the throttle and the surge tank when the throttle is attached. Is done. In addition, the work of tightening bolts and the like can be performed on the anti-throttle side wall surface of the surge tank, so that the work is easy and the workability of assembly can be improved.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An intake system for an engine according to an embodiment of the present invention is characterized in that a surge tank and a throttle body are fixed by a bracket extending from the engine. 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. As shown in FIGS. 1 and 2, the intake device according to the present embodiment includes an intake port 1.
An air cleaner unit 10 for removing dust contained in air taken in from the air intake unit 2, an intake manifold 20 having one end formed with a mounting part 22 for attaching the intake device to the engine 90, and another end of the intake manifold 20. The surge tank 30 includes a surge tank 30, a throttle 40 attached to the center of the surge tank 30, and a passage 50 connecting the throttle 40 and the air cleaner unit 10.

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 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. Also, the throttle 40 has
A pressure sensor 46 for detecting the pressure in the throttle and a position sensor 4 for detecting the opening of the throttle valve 42
The sensor output is input to an engine control unit (ECU) (not shown).

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 box shape, and air in the surge tank 30 is led out to the intake manifold 20. By setting the mounting 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 shapes of the throttle body 44 and the surge tank 30 and the state of connection 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.

A bracket 74 as a mounting member is for directly fixing the surge tank 30 and the throttle 40 to the engine 90, and has one end mounted to a part of the engine 90 by a bolt (not shown). The other end is connected to a position corresponding to the throttle 40 on the lower surface of the surge tank 30 described above. FIG.
FIG. 3 is a partially enlarged cross-sectional view showing the vicinity of a throttle and a surge tank shown in FIG. 2. FIG. 4 is a diagram showing details of a connection portion between the throttle 40 and the surge tank 30. FIG.
As shown in FIG. 4 and FIG.
Four mounting holes 82 for passing four bolts 80 as fastening means for connecting the throttle body 44 to the surge tank 30 are formed.

The surge tank 30 has a throttle 4
The four connecting portions 32 extending inward from one wall surface serving as the mounting surface of No. 0 and the four connecting portions 34 extending inward from the other wall surface opposing the mounting surface respectively include a housing 71 or a housing. 70 are formed integrally. When the housing 71 and the housing 70 are joined, the corresponding connection portions 32 and 34 connect the throttle mounting surface of the surge tank 30 and the surface facing the throttle mounting surface through the internal space. Each of the connecting portions 32 and 34 is formed in a cylindrical shape, and each of the hollow portions is entirely provided with a mounting hole 36 through which the bolt 80 for fastening the throttle 40 is inserted.
Thus, it functions as a storage section for the bolt 80. Also,
Since this mounting hole 36 is connected to the outside of the surge tank 30, the joint between the connecting portions 32 and 34 (for example, A gasket 38 as a sealing member for securing airtightness is attached to the outer peripheral end).

The above-described throttle 40 and surge tank 3
0, the mounting hole 82 formed in the throttle body 44 and the connecting portion 32 of the surge tank 30
After the positioning of the mounting holes 36 formed using the hollow portions of the mounting holes 34 and the mounting holes of the bracket 74 formed at the same pitch as the mounting holes 82 and 36 is performed, the mounting from the throttle 40 side is performed. Bolt 80 is inserted through holes 82 and 36. The length of the bolt 80 is set to be slightly longer than the sum of the lengths of the mounting holes 82 and 36 and the thickness of the bracket 74. By tightening the nut 84 at the tip of the bolt 80, the throttle 40 and the surge Tank 30
And the bracket 74 are fastened together. FIG. 5 is a diagram illustrating a mounting state of the bracket 74. As shown in the figure, a bracket 74 is attached to the surge tank 30 and the throttle 40 by arranging a bracket 74 below the surge tank 30 and further tightening the nut 74 from below.

The intake device of this 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 connecting portion 3 connected through the internal space between the throttle mounting surface of the surge tank 30 and the surface facing the throttle mounting surface.
2, 34 are formed, and these connecting portions 32, 3
4 forms a mounting hole 36 penetrating the surge tank 30. An aluminum throttle 40 is provided above the surge tank 30 and an engine 90 is provided below.
Brackets 74 are provided, and bolts 80 are inserted from the throttle 40 side, and these components are jointly fastened with nuts 84 from the bracket 74 side, whereby the throttle 40 and the surge tank 30 are assembled. . Therefore, since the aluminum throttle 40 is directly fixed by the bracket 74 extending from the engine 90, vibration due to resonance or the like of the throttle 40 can be suppressed. Further, since the vibration of the throttle 40 and the surge tank 30 adjacent thereto is suppressed, it is possible to prevent the throttle valve 42 and other components from being damaged and generating unpleasant noise due to the vibration.

In particular, when the surge tank 30 is sandwiched between the throttle 40 and the bracket 74, the vibration of the surge tank 30 can be minimized. In addition, since the bracket 74 is disposed at the lowermost position and the surge tank 30 and the throttle 40 are disposed thereon, the work of attaching the intake device to the engine 90 becomes easy. Further, since the assembling work can be performed from the lower side of the surge tank 30, a work area can be ensured even when other parts such as the air cleaner 10 are arranged above the surge tank 30.

The above-described throttle 40, surge tank 30, and bracket 74 are fixed by passing bolts 80 from the throttle 40 side and tightening with nuts 84 from the opposite side (bracket side). Aluminum), a female screw groove is formed on the inner peripheral side of the mounting hole 82 of the throttle body 44, and the throttle 40
, The throttle 40, the surge tank 30, and the bracket 74 may be fixed.

FIG. 6 is a view showing a modified example of the attached state of the throttle. As shown in FIG.
A mounting hole 182 having a female screw groove is formed in the inner peripheral side of the throttle 44. By inserting and tightening a screw 180 from the bracket 74 side, the throttle 140, the surge tank 30, and the bracket 74 are tightened together. Is performed. As described above, by utilizing the fact that the throttle body 144 is made of metal, the mounting hole 18 having a female thread groove is used.
By forming 2, a nut for tightening the bolt becomes unnecessary, and the number of parts can be reduced.

The above-described bracket 74 is disposed below the surge tank 30.
Although the surge tank 30 is sandwiched between the throttle 4 and the throttle 40 or 140, it is sufficient if the relatively heavy throttle 40 or the like can be directly fixed by the bracket 74 to suppress the vibration generated in the throttle 40 or the like. The mounting position may be changed.

FIG. 7 is a view showing a modified example of the intake device in which the mounting position of the bracket is changed. FIG. 8 is an enlarged side view of the vicinity of the throttle shown in FIG. FIG.
FIG. 9 is a sectional view taken along line IX-IX shown in FIG. 8. The bracket 274 shown in these figures is bent so as to go around the surge tank 30 and reach the upper end surface of the throttle body 244, and is fixedly attached to the throttle body 244 by screwing its tip. . Thus, by directly attaching the bracket 274 to the throttle body 244, the vibration can be suppressed by fixing the throttle body 244 with the bracket 274. In this case, the surge tank 30 does not need the connecting portions 32 and 34 as shown in FIG. be able to. Alternatively, as shown in FIGS. 10 and 11, a bracket 374 formed to surround the surge tank 30 may be screwed on the front surface of the throttle body 344 instead of the upper end surface.

The present invention is not limited to the above embodiment, and various modifications can be made within the scope of the present invention. For example, in the above-described embodiment, the case where the throttle 40 and the like are arranged substantially at the center of the surge tank 30 has been described. However, the arrangement position of the throttle 40 and the like is not limited to the vicinity of the center of the surge tank 30 but is biased toward the end. You may.

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 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. In particular, by using the surge tank 30 having a shape as shown in FIGS. 1 to 6, the assembling work can be performed under the surge tank 30 where no other parts of the intake device such as the air cleaner unit 10 exist.
Workability can be improved.

[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 partially enlarged sectional view of the vicinity of a throttle and a surge tank 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 a diagram showing a mounting state of a bracket.

FIG. 6 is a view showing a modified example of a mounted state of a throttle.

FIG. 7 is a view showing a modified example of the intake device in which the mounting position of the bracket is changed.

FIG. 8 is an enlarged side view of the vicinity of a throttle.

9 is a sectional view taken along line IX-IX shown in FIG.

FIG. 10 is a view showing a modification of the mounting position of the bracket.

FIG. 11 is a view showing a mounting state of a bracket tip shown in FIG. 10;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Air cleaner part 20 Intake manifold 30 Surge tank 32, 34 Connecting part 36, 82 Mounting hole 40 Throttle 42 Throttle valve 44 Throttle body 50 Passage 80 Volt

Claims (5)

[Claims] 1. An intake device for an internal combustion engine having a throttle body and an intake passage member communicating with the throttle body, wherein the throttle body and the intake passage member are connected by fastening means connecting the throttle body and the intake passage member. An intake device for an internal combustion engine, wherein the intake passage member and a mounting member extending from the internal combustion engine are fastened together. 2. The intake device for an internal combustion engine according to claim 1, wherein the intake passage member is a surge tank, and a housing portion for the fastening means is provided through the inside of the surge tank. 3. The intake device for an internal combustion engine according to claim 2, wherein the mounting member, the surge tank, and the throttle body are arranged in this order. 4. The intake device for an internal combustion engine according to claim 3, wherein the attachment member is disposed at a lowermost position. 5. A surge tank included in an intake device for an internal combustion engine, comprising a connecting portion connecting an inner space between a throttle mounting surface and a surface facing the throttle mounting surface, wherein a through hole is formed in the connecting portion. A surge tank characterized by being formed.