JPH1162789A - Intake device for internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the intake device for an internal combustion engine whereby a fuel injection device can be installed easily and the shape of a fuel injection device mounting part becomes simple. SOLUTION: An injector 30 is stored in the dusty side case 80 of an air cleaner part 10, and its fixing is made by fixing a delivery pipe 32 to the other member. Also the fixing of the delivery pipe 32 is made by pulling out a fixing bracket 34 installed so that it tightens the outer peripheral part of the delivery pipe 32 through a through hole 36 opened in the bottom surface of the dusty side case 80 and screwing it to a mounting pedestal 38 integrated with an intake manifold 20.

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 Conventionally, an internal combustion engine (engine) for a vehicle has been used.
A method of integrating the intake system components is known. For example, JP-A-8-93580 discloses an air cleaner,
An "intake device for an internal combustion engine" in which a throttle, a surge tank, an intake manifold and the like are integrated is disclosed.
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, in the intake device disclosed in the above-mentioned Japanese Patent Application Laid-Open No. Hei 8-93580, an injector for injecting fuel is mounted in an air cleaner case, and fuel is supplied to each injector by a delivery pipe. Supplying. Moreover, the delivery pipe itself is installed in the air cleaner case. Therefore, in order to fix the delivery pipe, it is necessary to form a pedestal in the air cleaner case, which complicates the shape of the air cleaner case. Especially,
Recently, due to the demand for miniaturization, it is conceivable that the arrangement of the air cleaner elements installed in a substantially horizontal direction as shown in FIG. 1 of the above-mentioned publication may be changed in the vertical direction. Since the space in which the injector and the delivery pipe are installed becomes narrow, it is not easy to form the mounting base for the delivery pipe in the air cleaner case. Alternatively, when the above-described pedestal is formed in the air cleaner case, the shape of the mold required for manufacturing the member including the air cleaner case becomes large and complicated, and the manufacture of the mold itself is not easy, and the life of the mold is long. Be shorter. In addition, when assembling the intake device or replacing the injector, the work of attaching and detaching the delivery pipe in a narrow space is not easy, and there is a problem that workability is poor.

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 fixing operation of the fuel injection device is easy and the shape of the mounting portion of the fuel injection device is simple. To provide.

[0005]

In order to solve the above-mentioned problems, in an intake device for an internal combustion engine according to the present invention, a fuel injection device is accommodated in an intake passage defined by an intake passage forming member, and a fuel injection device is provided. The injection device is fixed outside the intake passage. As a specific method of fixing the fuel injection device, a mounting member of the fuel supply device for supplying fuel to the fuel injection device may be extended outside the intake passage and attached to another member, or both ends of the fuel supply device may be suctioned. It is conceivable that the protruding portion is attached to another member by protruding outside the passage.

[0006] As described above, by fixing the fuel injection device outside the intake passage, the fixing work is facilitated. Further, it is not necessary to form a pedestal or the like for fixing the fuel injection device in the intake passage, and the intake passage is formed in a simple shape without being complicated. In this case, the shape of the molding die can be simplified, and the production can be facilitated and the production cost can be reduced.

In particular, it is preferable that the above-described fixing of the fuel supply device is performed on a member integrally formed with the intake manifold. As described above, since the fuel injection device is attached to the intake manifold and the fuel supply device is attached to a member integrated with the intake manifold, positioning of the fuel supply device and the like can be facilitated, and work efficiency can be increased. .

Further, when an air cleaner case is considered as the above-described intake passage forming member, the inside of the air cleaner portion to which the fuel injection device is attached can be made simple. In addition, when the fuel injection device is installed in the dusty side case of the air cleaner case, even if external air is sucked through the opening penetrated for fixing, dust contained in the sucked air is subsequently removed. Therefore, it is not necessary to strictly maintain the hermetically sealed state of the opening, and the design and assembling work of parts becomes easy.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An engine intake device according to an embodiment of the present invention is characterized in that when an injector is accommodated and fixed inside an air cleaner portion, this fixing is performed outside the air cleaner portion. is there. Hereinafter, an intake device for an engine according to an embodiment of the present invention will be specifically described with reference to the drawings.

[First Embodiment] FIG. 1 is a view showing the structure of an intake system for an engine according to a first embodiment of the present invention. FIG. 2 is an enlarged sectional view taken along the line II-II shown in FIG. As shown in FIGS. 1 and 2, the intake device according to the first embodiment includes an air cleaner unit 10 that removes dust contained in air taken in from an intake port 12 and an engine (not shown). Mounting part 2 to be attached to
2, an intake manifold 20 formed at one end, an injector 30 as a fuel injection device attached near the end of each branch pipe 24 of the intake manifold 20, and a fuel supply device to supply fuel to the injector 30 A delivery pipe 32, a surge tank 40 provided at the other end of the intake manifold 20, a throttle 50 attached to an end of the surge tank 40,
And a passage 60 connecting the air cleaner unit 10 and the air cleaner unit 10.

[0011] The components of the above-described intake device are integrated. For example, as shown in FIG. 2, a part of the air cleaner section 10 and the intake manifold 2 are formed by the housing 70.
0 and a surge tank 40 are formed, and a cap 72 or the like including a part of the air cleaner unit 10 is attached thereto, and the whole is integrated. 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 and a cover 17 for mounting and storing the air cleaner element 14, and an air cleaner case 18 formed by a part of a housing 70 and a cap 72. Be composed. In the air cleaner case 18, the upstream side of the intake air with respect to the air cleaner element 14 is particularly called a dusty side case 80, and the downstream side is called a clean side case 82.
The space enclosed by 2 is called the dusty side space or clean side space. In addition, a part of the intake passage is formed by the dusty side space and the clean side space.

A dusty side space in the dusty side case 80 and a clean side space in the clean side case 82 are separated with the air cleaner element 14 mounted on the guide 16 interposed therebetween. The air introduced into the space passes through the air cleaner element 14 to remove dust and is introduced into the clean side space. This guide 16
Can be attached and detached by sliding in the vertical direction with respect to the flow of air through the air cleaner element 14, and when attached to the air cleaner unit 10, a seal member (not shown) formed on the outer periphery thereof allows The dusty side space and the clean side space are separated. Further, a cover 17 is integrated with the guide 16, and when the air cleaner element 14 is inserted into the air cleaner portion 10, the insertion opening is covered with the cover 17, so that the air cleaner element 14 is inserted into the dusty side space through the insertion opening. To prevent the inflow of air.

The passage 60 is provided in the air cleaner element 14.
For guiding the air passed through the clean side space to the surge tank 40 through the throttle 50, and is formed in a U-shape having a circular cross section. The throttle 50 includes a throttle valve and a throttle body, and adjusts an amount of air taken into each cylinder row of the engine. The throttle 50 has a pressure sensor 52 for detecting the pressure in the throttle 50.
And a position sensor 54 for detecting the opening of the throttle valve are attached, and the outputs of these sensors are input to an engine control unit (ECU) (not shown).

The surge tank 40 distributes the air taken in through a throttle 50 attached to an end to each branch pipe 24 of the intake manifold 20. Further, a trapper chamber 42 is formed by separating a part of the surge tank 40, and moisture and the like contained in blow-by gas guided from the engine are removed. The intake manifold 20 is for introducing air after removing dust introduced through the surge tank 40 into each cylinder row of the engine,
It is constituted by the same number of branch pipes 24 as the number of cylinders of the engine. For example, the engine to which the intake device of the present embodiment is attached is a three-cylinder engine, and the intake manifold 20 includes three branch pipes 24. At the tip (end opposite to the surge tank 40) of each branch pipe 24, a mounting portion 22 for mounting the intake device to the engine is formed. A bolt 26 is provided in the through hole 26 provided in the mounting portion 22. (Not shown) to attach the intake device to the engine.

The injector 30 injects fuel (gasoline) supplied from a tubular delivery pipe 32 as a fuel supply device into the engine at a predetermined timing. In the vicinity of the distal end of each branch pipe 24 of the intake manifold 20, there is provided a mounting hole 2 which penetrates straight from the mounting surface of the mounting portion 22 toward the inside of the dusty side case 80 of the air cleaner portion 10.
8 are formed, and the injector 3 is
0 is inserted. The injector 30 is fixed at its end (the dusty side case 8 of the air cleaner 10).
This is performed by fixing the delivery pipe 32 attached to the (0 side).

In the present embodiment, the delivery pipe 3
2 is fixed by a fixing bracket 3 as an attachment member attached so as to tighten the outer peripheral portion of the delivery pipe 32.
4 is pulled out through the through hole 36 formed in the bottom surface of the dusty side case 80 and screwed to a mounting base 38 integrated with the intake manifold 20.

FIG. 3 is a view showing a fixing structure of the delivery pipe 32, and shows a cross-sectional structure near the mounting base 38. As shown in FIGS. 2 and 3, the mounting base 38 is
Delivery pipe 32 with dusty side case 80 interposed
Is provided at a position adjacent to. For example, mounting base 3
Numerals 8 are provided at a total of two places between adjacent branch pipes 24, and fixing brackets 34 are screwed to these mounting bases 38. In addition, this fixing bracket 34
The through-hole 36 formed on the bottom surface of the dusty side case 80 for passing water has a function as a drain hole for removing moisture that has entered the inside of the dusty side case 80.

The intake device of this embodiment has such a structure, and its operation will be described next. The air taken into the dusty side case 80 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 guided into the clean side case 82. Further, this intake air flows into the surge tank 40 via the throttle 50 after passing through the passage 60. Surge tank 40
Distributes the inflow air to the three branch pipes 24 of the intake manifold 20, and the distributed air is supplied to the respective cylinders of the engine via the respective branch pipes 24 together with the fuel injected from the injector 30. . The amount of air taken into each cylinder of the engine is controlled by the opening of a throttle valve in the throttle 50.

In the intake device of the present embodiment, the fixing bracket 34 of the delivery pipe 32 attached to the injector 30 is drawn out of the air cleaner unit 10 through the through hole 36 formed in the bottom surface of the dusty side case 80. Thus, it is fixed to a mounting base 38 integrated with the intake manifold 20. As described above, the injector 30 can be fixed outside the narrow air cleaner unit 10 instead of inside the narrow air cleaner unit 10, so that the mounting operation is facilitated. In addition, since the mounting base 38 is provided outside the air cleaner section 10, the inside of the air cleaner section 10 can be made to have a relatively simple shape. And the manufacturing cost can be reduced. The above-described injector 30 is attached to the end of the intake manifold 20 and the delivery pipe 32 is fixed to a mounting base 38 integrated with the intake manifold 20. Since positioning can be performed on the basis of
Work efficiency can be improved. Further, the through-hole 36 formed in the dusty side case 80 for passing the fixing bracket 34 can be used as a drain hole, so that the moisture that has entered the inside of the air cleaner unit 10 can be efficiently removed. Moreover, this through hole 36
It is formed in the dusty side case 80. Even if external air is sucked into the air cleaner unit 10 through the through hole 36, dust is removed, and there is no particular problem.

FIG. 4 is a sectional view showing a modified example of the intake device of the present embodiment. FIG. 5 is a diagram showing a fixing structure of the delivery pipe in the intake device shown in FIG. The intake device shown in these figures is different from the intake device shown in FIGS. 1 to 3 in that the shape of a fixing bracket 34A for fixing the delivery pipe 32, the position of a mounting base 38A for attaching the fixing bracket 34A, and the like. Are different, and the other structures are common. The mounting pedestal 38A of the intake device shown in FIGS. 4 and 5 is provided on the back surface of the mounting portion 22 of the intake manifold 20 (behind the mounting surface to the engine). Also, the fixing bracket 34A of the delivery pipe 32 is extended in an L-shape through a through hole 36 formed in the bottom surface of the dusty side case 80,
Its end is fixed to the mounting base 38A described above.
In this manner, by providing the mounting base 38A for mounting the fixing bracket 34A on the back surface of the mounting portion 22 of the intake manifold 20, the thickness near the mounting base 38A can be reduced, and the material cost can be reduced. .

[Second Embodiment] FIG. 6 is a front view showing the structure of an intake device for an engine according to a second embodiment of the present invention. FIG. 7 is a plan view of the intake device shown in FIG. FIG. 8 is a left side view of the intake device shown in FIG. FIG. 9 is an enlarged sectional view taken along line IX-IX shown in FIG. FIG. 10 is a diagram illustrating a fixing structure of an end portion of the delivery pipe, and is an enlarged cross-sectional view taken along line XX illustrated in FIG. 8. As shown in these figures, the intake device according to the second embodiment includes:
As with the intake device of the first embodiment described above, the air cleaner unit 10, the intake manifold 20, the injector 3
0, a delivery pipe 132, a surge tank 40, a throttle 50, and a passage 60. Most of these components are common to the components of the intake device of the first embodiment shown in FIG. 1 and the like, and the corresponding components are denoted by the same reference numerals. The description will be made by focusing on.

The delivery pipe 132 is a tubular member having one end closed, and a fuel is supplied by fitting a fuel hose (not shown) to the other open end. The delivery pipe 132 is connected to the intake manifold 2
The injectors 30 are attached to the ends of the injectors 30 attached to the three branch pipes 24, respectively, and fix the injectors 30 together with the supply of fuel.

The delivery pipe 132 is housed inside the dusty side case 80 of the air cleaner portion 10, and its entire length is longer than the width of the dusty side case 80, and both ends are formed on the side surfaces of the dusty side case 80. The length is set so as to be exposed to the outside from the formed through hole 136. Also, Dusty side case 80
The mounting base 138 is provided on both sides of the mounting pipe 138. By mounting both ends of the delivery pipe 132 on the mounting base 138, the fixing bracket 134 is screwed to fix both ends of the delivery pipe 132. ing. A grommet 139 for maintaining airtightness is fitted in a through hole 136 formed on the side surface of the dusty side case 80. The through hole 136 and the delivery pipe 1
32 is filled. However, even if air flows into the air cleaner unit 10 from the gap, dust is removed by the air cleaner element 14, so that the grommet 139 may be removed.

In the intake device of this embodiment, a through hole 136 is formed in the side surface of the dusty side case 80, and both ends of the delivery pipe 132 attached to the injector 30 are exposed to the outside of the air cleaner 10 through the through hole 136. The exposed both ends are fixed to the mounting base 138. As described above, the delivery pipe 132, that is, the injector 30 can be fixed outside the narrow air cleaner unit 10 instead of inside the narrow air cleaner unit 10, so that the mounting work becomes easy. Also, the mounting base 13
Since the inside of the air cleaner unit 10 can be formed into a relatively simple shape by providing the outer surface 8 of the air cleaner unit 10, the shape of the mold at the time of resin molding can be simplified. Manufacturing costs can be reduced. In addition, the injector 30 described above is attached to the end of the intake manifold 20, and the delivery pipe 132 is fixed to the mounting base 138 of the housing 70 integrated with the intake manifold 20. Since the work can be performed with reference to the intake manifold 20, positioning and the like can be facilitated and work efficiency can be improved.

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 each of the embodiments described above, the intake manifold 20 having three branch pipes 24 has been described as an example. However, the number of branch pipes 24 can be appropriately changed according to the number of cylinders of the engine. Further, in the above-described embodiment, the description has been given of the intake device in which all the components along the path until the air taken into the air cleaner unit 10 flows out from the intake manifold 20 are integrated. Only the components may be integrated, and the remaining components may be externally attached as separate components.

[Brief description of the drawings]

FIG. 1 is a diagram showing a structure of an intake device for an engine according to a first embodiment to which the present invention is applied.

FIG. 2 is an enlarged sectional view taken along line II-II shown in FIG.

FIG. 3 is a view showing a fixing structure of a delivery pipe.

FIG. 4 is a sectional view showing a modification of the intake device of the first embodiment.

FIG. 5 is a diagram showing a fixing structure of a delivery pipe in the intake device shown in FIG. 4;

FIG. 6 is a front view showing a structure of an intake device for an engine according to a second embodiment to which the present invention is applied.

FIG. 7 is a plan view of the intake device shown in FIG. 6;

FIG. 8 is a side view of the intake device shown in FIG. 6;

FIG. 9 is an enlarged sectional view taken along line IX-IX shown in FIG. 6;

FIG. 10 is an enlarged view showing a fixing structure of an end of the delivery pipe.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Air cleaner part 18 Air cleaner case 20 Intake manifold 30 Injector 32 Delivery pipe 34 Fixing bracket 36 Through hole 38 Mounting base 40 Surge tank 50 Throttle 60 Passage 70 Housing 80 Dusty side case 82 Clean side case

Claims (6)

[Claims] 1. A fuel injection device is accommodated in an intake passage defined by an intake passage forming member, and the fuel injection device is fixed outside the intake passage through the intake passage forming member. An intake device for an internal combustion engine, characterized by: 2. The intake device for an internal combustion engine according to claim 1, wherein a mounting member of a fuel supply device that supplies fuel to the fuel injection device extends outside the intake passage. 3. The intake device for an internal combustion engine according to claim 1, wherein both ends of a fuel supply device that supplies fuel to the fuel injection device extend outside the intake passage. 4. The intake device for an internal combustion engine according to claim 1, wherein the fuel supply device is fixed to a member integrated with the intake manifold. 5. The intake device for an internal combustion engine according to claim 1, wherein the intake passage forming member constitutes an air cleaner case. 6. The intake device for an internal combustion engine according to claim 5, wherein the fuel injection device is housed in a dusty side case of the air cleaner case.