JPH11132116A - Intake device for internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily ensure air-tightness of an air cleaner element, and facilitate assembling work in a condition in which the air-tightness is held. SOLUTION: An intake device is composed of a rose flower type air cleaner part 10 for taking out dusts contained in air sucked from a take-in port 12, an intake manifold 20 whose one end is installed on an engine, a surge tank 30 arranged on the other end of the intake manifold 20, a throttle 40 installed on a nearly center of the surge tank 30, and a duct 50 as a passage for connecting the throttle 40 and the air cleaner part 10 to each other. The air cleaner element 14 is mounted by fitting its inner circumferential end part to an element mounting part 54 formed on a tip end of a duct 50 through a sealing member.

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.

[0003] Recently, a method of integrating each component of the above-described intake device has been known. For example, Japanese Unexamined Patent Publication
-81735 and European Patent Publication No. 052302.
No. 7A2 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 integrally formed. 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.

[0004]

By the way, the air cleaner element included in the air cleaner of the intake device disclosed in each of the above-mentioned prior art publications has a filter medium disposed on a side surface, and air introduced from the outer peripheral side of the side surface is removed. It has a structure in which dust is removed by being introduced into the inner side through a filter medium.
The sealing of the air cleaner element is performed by a cap on the upper part of the air cleaner element, thereby maintaining the airtightness between the dusty side space outside the air cleaner element and the clean side space inside the air cleaner element. For this reason, airtightness cannot be maintained due to variations in the dimensions of the air cleaner element and the case accommodating the aircleaner element. Further, when replacing the air cleaner element, it is necessary to perform the work while taking airtightness into consideration, and the work is complicated. Problem.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to make it possible to easily secure airtightness of an air cleaner element and to easily perform an assembling operation while maintaining airtightness. It is an object of the present invention to provide a simple intake device for an internal combustion engine.

[0006]

In order to solve the above-mentioned problems, an air intake device for an internal combustion engine according to the present invention is configured such that an air cleaner element is fitted with a passage extending toward an internal space of an air cleaner portion. The air-tightness of the air cleaner element is secured, and the assembling work with the air-tightness maintained is facilitated. In particular, when the air cleaner element is mounted by fitting the passage and the air cleaner element, it is preferable to interpose a seal member therebetween. Fitting the air cleaner element into the passage facilitates the mounting operation. In addition, airtightness can be reliably ensured by interposing a seal member.

Specifically, it is considered that the outer peripheral portion of the opening end of the passage and the inner peripheral portion of the air cleaner element are fitted, and the case where at least a part of the outer peripheral portion of the air cleaner element is fitted inside the passage. In any case, the air cleaner element can be mounted and fixed only by fitting them together, so that the assembling work becomes easy.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An air intake device for an engine according to an embodiment of the present invention is configured such that an air cleaner element is fitted with an opening of a duct as a passage extending toward an internal space of an air cleaner portion. There is a feature in performing the mounting of. 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 longitudinal sectional view of an intake system 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 of FIG. FIG. 3 is a diagram showing the internal structure of the intake device as viewed from above with the cover removed.
As shown in these drawings, the intake device of the present embodiment includes an air cleaner unit 10 for removing dust contained in air taken in from an intake port 12, an intake manifold 20 having one end attached to an engine, an intake manifold 20 A surge tank 30 provided at the other end of the fuel tank 20, a throttle 40 mounted substantially at the center of the surge tank 30, a duct 50 as a passage connecting the throttle 40 and the air cleaner unit 10, and an injector as a fuel injection device And a delivery pipe 62 for supplying fuel to the injector 60.

[0010] The components of the above-described intake device are integrated. For example, as shown in FIG. 1, a housing is formed by a housing 70 and a cover 72, and the entire intake device is integrated with other components. This integrated state is attached to the engine 90. Hereinafter, the configuration of each component of the above-described intake device will be described in detail. The air cleaner section 20 includes a chrysanthemum flower-shaped air cleaner element 14 formed of a resin, a seal member 16 attached to the inner peripheral end, an air cleaner case 18 formed by a cover 72 and a part of the housing 70. It is comprised including.

The air cleaner element 14 has a chrysanthemum flower shape, and an inner peripheral portion thereof is fitted to an outer peripheral portion of an opening end of the duct 50 via a seal member 16 (described later). FIG. 4 shows an air cleaner element 14 having a chrysanthemum flower shape.
1 is an external perspective view of FIG. 1, showing a partially broken state. As shown in FIG.
Has a shape in which irregularities are formed along the circumferential direction on the side surface of the cylindrical mold, is formed by resin molding, and has a certain degree of hardness. The space surrounded by the side surface of the air cleaner element 14 and the air cleaner case 18 forms a dusty side space 80, and the internal space surrounded by the filter medium of the air cleaner element 18 forms a clean side space 82. The air introduced into the dusty side space 80 through the intake port 12 is passed through the air cleaner element 14 from outside to remove dust and is introduced into the clean side space 82.

The duct 50 has a flange 52 near the opening at one end thereof.
4 through the clean side space 82,
This is for guiding to the surge tank 30 via the throttle 40. An end portion of the duct 50 and a tip portion of the flange portion 52 further functions as an element mounting portion 54.

FIG. 5 is an enlarged view showing a state in which the air cleaner element 14 is mounted. The air cleaner element 14 is mounted by fitting the inner peripheral end of the air cleaner element 14 having the shape shown in FIG. 4 from the outer peripheral side via the seal member 16 to the element mounting portion 54 at the distal end of the duct 50. . As described above, the air cleaner element 14 having a chrysanthemum flower shape is merely fitted to the outer peripheral side of the element mounting portion 54 at the end of the duct 50 via the seal member 16, so that the dusty side space 80 and the clean side space 82 Airtightness can be ensured.

The throttle 40 is constituted by a throttle valve and a throttle body. The throttle 40 changes the opening of the throttle valve in conjunction with an accelerator pedal (not shown), so that air sucked into each cylinder row of the engine. Is adjusted. The surge tank 30
It has a box-like shape having an internal space of a predetermined capacity, and a throttle 40 is disposed substantially at the center of the upper surface thereof, through which air is introduced.

An intake manifold 20 is attached to a side surface of the surge tank 30.
The air in 0 is drawn into the intake manifold 20. As described above, by setting the attachment position of the throttle 40 at the center of the surge tank 30, the tone of the intake sound can be improved and the cylinder distribution can be improved. The intake manifold 20 is for introducing the air from which dust introduced through the surge tank 30 has been removed into each cylinder row of the engine, and has the same number of branch pipes 24 as the number of cylinders of the engine. ing. For example, the engine to which the intake device of the present embodiment is attached is a four-cylinder engine, and the intake manifold 20 has four branch pipes.

The injector 60 injects fuel (gasoline) supplied from a delivery pipe 62 as a fuel supply pipe into the engine 90 at a predetermined timing. The injector 60 is mounted in a mounting hole 64 formed in a part of the housing 70. Further, the injector 60 is fixed by fixing a delivery pipe 62 attached to an end thereof (the side opposite to the engine 90).

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 80 of the air cleaner unit 10 from the intake port 12 passes through the air cleaner element 14 to remove dust and is led to the clean side space 82. Further, the intake air is sucked into the duct 50 communicating with the clean side space 82 and flows into the surge tank 30 via the throttle 40 after passing through the duct 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 injected into the respective cylinders of the engine 90 via the respective branch pipes 24 and injected into the respective cylinders of the engine 90 from the injectors 60. Supplied with. The amount of air taken into each cylinder of the engine 90 is controlled by the opening of a throttle valve in the throttle 40.

As described above, in the intake device of the present embodiment, the air cleaner portion 10 is formed in a chrysanthemum shape, and the inner peripheral portion thereof is attached to the element mounting portion 54 at the tip of the duct 50 by the sealing member 16.
Air cleaner element 1
4 is installed. Therefore, airtightness can be easily ensured only by fitting the air cleaner element 14 to the element mounting portion 54 of the duct 50. Also, since there is no need to press or pinch the air cleaner element 14 with other parts, the peripheral parts of the air cleaner element 14 can be individually assembled,
Assembly work becomes easy.

In the above-described embodiment, the inner peripheral side of the air cleaner element 14 is fitted to the distal end of the duct 50. Alternatively, the outer peripheral side of the air cleaner element 14 may be fitted to the duct 50. FIG. 6 is a longitudinal sectional view of an intake device having a structure in which the outer periphery of an air cleaner element is fitted to a duct. FIG. 7 is a sectional view taken along line VII-VII of FIG. The intake device shown in these figures is different from the intake device shown in FIGS. 1 to 3 mainly in the structure of an air cleaner portion and a duct connected to the air cleaner portion, and an air cleaner element is directly provided inside the opening of the duct. There is a characteristic in that it is attached.

The intake device shown in FIGS. 6 and 7 includes an air cleaner section 110 for removing dust contained in the air taken in from the intake port 12, an intake manifold 20 having one end attached to the engine 90, and an intake manifold 20.
A surge tank 30 provided at the other end of the throttle tank 30 and a throttle 40 attached substantially at the center of the surge tank 30;
It includes a duct 150 as a passage connecting the throttle 40 and the air cleaner unit 110, an injector 60 as a fuel injection device, and a delivery pipe 62 for supplying fuel to the injector 60.

As shown in FIG. 8, the air cleaner section 110 has a chrysanthemum flower-shaped cylindrical shape, and has an air cleaner element 114 having a flat bottom surface. Also, duct 1
50 has an element housing 152 formed by enlarging the opening at one end. Air cleaner element 1
The mounting of the air cleaner element 114 is performed by fitting a side portion of the air cleaner element 114 into the element storage section 152.

FIG. 9 is an enlarged view showing a state where the air cleaner element 114 is mounted. As shown in FIG. 9, the air cleaner element 114 having a cylindrical shape shown in FIG. 8 is fitted and housed in the element housing part 152 of the duct 150. At this time, the air cleaner element 114
By interposing a ring-shaped seal member 116 between the flat bottom surface of the
Element storage section 152 and air cleaner element 11
4 is secured.

As described above, the air cleaner element 114 can be mounted by using the part of the duct 150 to form the element housing part 152 and fitting the air cleaner element 114 inside the element housing part 152. There is no need to press or pinch with the parts described above, and the work of mounting the air cleaner element 114 becomes easy. In addition, by interposing the ring-shaped seal member 116 between the air cleaner element 114 and the element housing portion 152, airtightness can be easily ensured.

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 shape of the air cleaner element 14 and the like is cylindrical, but other shapes may be used. For example, FIG.
As shown in FIG. 0, an air cleaner element having a so-called dome shape having a spherical shape as a whole can also be used.
Also, instead of forming the element housing 152 at the end of the duct 150 as shown in FIG. 9, the duct itself is used as shown in FIG. 11, and an air cleaner element that fits into the duct is built in. You may.

In the above-described embodiment, the intake manifold 20 having four 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. The throttle 40 is arranged substantially at the center of the lower surface of the surge tank 30, and the length of each branch pipe 24 of the intake manifold 20 is set to be substantially equal. However, the position of the throttle 40 and the length of each branch pipe 24 are appropriately changed. be able to. Further, the injector 60 is not always required to be provided in the intake device, and may be mounted on the engine 90 side.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an intake device for an engine according to an embodiment.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a diagram showing a structure of the intake device shown in FIG. 1 as viewed from above with a cover removed.

FIG. 4 is an external perspective view of an air cleaner element used in the intake device shown in FIG.

FIG. 5 is an enlarged view showing a state where the air cleaner element is mounted.

FIG. 6 is a longitudinal sectional view of an intake device having a structure in which an outer periphery of an air cleaner element is fitted to a duct.

FIG. 7 is a sectional view taken along line VII-VII of FIG. 6;

8 is an external perspective view of an air cleaner element used in the intake device shown in FIG.

FIG. 9 is an enlarged view showing a state where the air cleaner element is mounted.

FIG. 10 is a view showing a modification of the air cleaner element.

FIG. 11 is a view showing another modification of the air cleaner element.

[Explanation of symbols]

 10, 110 Air cleaner section 12 Intake port 14, 114 Air cleaner element 16, 116 Seal member 20 Intake manifold 30 Surge tank 40 Throttle 50, 150 Duct 52 Collar section 54 Element mounting section 120 Collar section 152 Element storage section

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hideki Inaba 1-1-1 Toyota-cho, Kariya-shi, Aichi Prefecture Inside Toyota Boshoku Corporation

Claims (4)

[Claims] An intake device for an internal combustion engine, wherein a passage extending toward an internal space of an air cleaner portion is open, and the air cleaner element is mounted by fitting the passage with an air cleaner element. . 2. The intake device for an internal combustion engine according to claim 1, wherein a seal member is interposed between the passage and the air cleaner element. 3. The intake device for an internal combustion engine according to claim 1, wherein an outer peripheral portion of an opening end of the passage and an inner peripheral portion of the air cleaner element are fitted. 4. The intake device for an internal combustion engine according to claim 1, wherein at least a part of an outer peripheral portion of the air cleaner element is fitted into the passage.