JPH1162742A - Intake system of internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the intake system of an internal combustion engine which can ensure space necessary for a mounting work. SOLUTION: A air cleaner part 10 and a surge tank 30 are arranged across a mounting part 22 mounted on the top part of each branch pipe 24 of an intake manifold 20, and a passage 50 and a throttle 40 are provided between them. Each branch pipe 24 of the intake manifold 20 is bent a predetermined distance from the mounting part 22 toward the surge tank 30 to shift the center position of the surge tank 30 toward the row of cylinders of an engine by a predetermined distance, whereby the passage 50 overlaps the second branch pipe 24.

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-6-81735 discloses an air cleaner,
An "intake device for an internal combustion engine" is disclosed in which an air flow meter, a throttle valve, a surge tank, and an independent branch intake pipe (intake manifold) are integrated. By integrating the components of the intake device in this manner, the number of parts and the number of assembly steps can be reduced, and space can be saved.

FIG. 1 of the above publication shows a structure of an intake device in which a passage connecting an air cleaner and a surge tank is arranged between a second and a third independent branch intake pipe. As described above, by forming the above-described passage in the center of the surge tank and providing the throttle in a part thereof, it is possible to improve the tone of the intake sound and increase the cylinder distribution efficiency of the intake air.

[0004]

In the above-mentioned conventional intake device, a throttle is provided at the center of the surge tank, and the passage in which the throttle is formed is formed by the second and third intake manifolds. It is located between them. Therefore, there is a problem that when the whole is formed as an integral structure, a work space necessary for mounting the end face of the front end of the intake manifold to the engine head cannot be secured. That is, if the end face of the intake manifold is to be attached to the engine head with bolts or the like, it is necessary to secure a working space between adjacent branch pipes of the intake manifold. Is formed, and the space between the second and third branch pipes is covered, so that a working space in this portion cannot be secured.

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 which can secure a space required for an attaching operation.

[0006]

In order to solve the above-mentioned problems, in an intake device for an internal combustion engine according to the present invention, an air cleaner portion and a surge tank are disposed with an intake manifold end portion attached to an engine. In this case, the passage connecting them is arranged so as to overlap with any of the branch pipes of the intake manifold in the vicinity of the mounting portion. As described above, one of the branch pipes of the intake manifold overlaps with the above-described passage, and the space between the branch pipes is exposed when viewed from the passage side. Therefore, the exposed space is used as a work space for mounting the intake device. Can be.

It is preferable that the above-mentioned passage is provided so as to communicate with the center of the surge tank. By arranging the passage in the center of the surge tank, it is possible to improve the tone of the intake sound and increase the efficiency of distributing the cylinder of the intake air. In particular, when the intake manifold has an even number of branch pipes, a passage provided in the center of the surge tank as it is is provided between two branch pipes near the center of the intake manifold (for example, a four-cylinder engine). In the case of an intake manifold having four branch pipes corresponding to the above, the passage is disposed so as to close the space between the second and third branch pipes). By shifting the position of the surge tank so as to overlap with the above, a work space for fixing the mounting portion can be secured.

More specifically, the center position of the surge tank is displaced from the center position of the cylinder row of the engine, and each branch pipe of the intake manifold is meandered in accordance with the displacement amount, thereby forming a passage. While being placed at the center of the surge tank, it can be stacked on any of the branch pipes, and the above-mentioned working space can be secured.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An intake system for an engine according to an embodiment of the present invention is arranged such that a throttle or a passage attached to the center of a surge tank is overlapped with one of branch pipes of an intake manifold. It is characterized in that a work space for mounting the intake device formed between the branch pipes is secured. In the present specification, a working space necessary for performing a tightening operation of bolts and nuts when attaching a mounting portion at an intake manifold end to an engine will be referred to as a “tool space”. 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 the 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 mounted at the center of the surge tank 30, and a passage 50 connecting the throttle 40 and the air cleaner unit 10.

[0011] The components of the above-described intake device are integrated. For example, as shown in FIG.
, A housing 60 including the intake manifold 20 and the surge tank 30, and a cap 62 including a portion of the air cleaner unit 10 and the passage 50 are separately resin-molded,
These are joined by vibration welding or the like and 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,
A dusty side case 18 that forms a dusty side space upstream of the air cleaner element 14 and a clean side case 19 that forms a clean side space downstream are configured. The dusty side space in the dusty side case 18 and the clean side space in the clean side case 19 are separated by the air cleaner element 14 attached to the guide 16 and introduced into the dusty side space through the intake port 12. The air
The dust is removed by passing through the air cleaner element 14 and introduced into the clean side space. The guide 16 slides 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 guide 16 is attached to the air cleaner section 10, a seal member (see FIG. (Not shown), the hermetically sealed state with the cap 62 is maintained. Guide 16
A cover 17 is integrated with the air cleaner element 14. When the air cleaner element 14 is inserted into the air cleaner section 10, the insertion opening is covered with the cover 17 so that air flows into the dusty side space through the insertion opening. Has been blocked.

The passage 50 is a cylindrical member of the clean side case 19 of the air cleaner section 10 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. is there. 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. 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). ).

The surge tank 30 has a box shape. The throttle 40 described above is attached to the center of one surface of the box shape, and air flows into the surge tank 30 via the throttle 40. An intake manifold 20 is mounted on the other surface of the box shape, and air in the surge tank 30 is supplied to the intake manifold 20.
Is derived. As described above, by setting the attachment position of the throttle 40 to 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 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.

In the present embodiment, the air cleaner 10 and the surge tank 30 are connected to the intake manifold 2.
The mounting portion 22 provided at the end of the “0” is interposed therebetween. In FIG. 1, the air cleaner section 10 is disposed above the mounting section 22, and the surge tank 30 is separately disposed below the mounting section 22. Thus, by arranging the air cleaner unit 10 and the surge tank 30 apart, the length of each branch pipe 24 of the intake manifold 20 can be set to a certain length, and the torque of the engine 90 in the low-speed rotation range can be reduced. Can increase.

A passage 50 extending from the air cleaner section 10 to a throttle 40 provided at the center of the surge tank 30 is provided with a means for attaching the attachment section 22 to one of the branch pipes 24 of the intake manifold 20. Are arranged so as to overlap in a direction parallel to the operation line for tightening the bolt. As shown in FIG. 1, the intake manifold 2
A mounting portion 22 is formed so as to fill the space between the branch pipes 24 at the front end of the mounting portion 22. A bolt or a bolt is passed through a through hole 26 provided in the mounting portion 22, and a tool or device for tightening the bolt is used. The bolt is tightened by being inserted between the branch pipes 24. The space required for inserting a tool or the like for tightening the bolt and performing the tightening operation is a tool space, and the insertion direction of the tool or the like, that is, the axis of the bolt coincides with the operation line described above. This operation line is indicated by an arrow I in FIG. 2, and the second branch pipe 24 and the passage 50 are arranged along the arrow I so as to overlap.

As described above, the throttle 40 provided at the end of the passage 50 is attached to the center of the surge tank 30. Therefore, the surge tank 30 is arranged along the arrow I shown in FIG. 2 such that the second branch pipe 24 and the central position thereof overlap. The intake device of the present embodiment has such a structure, and the operation will be described next. The air taken into the dusty side case 18 of the air cleaner unit 10 from the intake port 12 is
The dust is removed by passing the air cleaner element 14 accommodated in the clean side case 19 and guided into the clean side case 19. 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.

An injector (not shown) is attached to the engine 90 so as to correspond to each cylinder. Fuel (gasoline) injected from the injector into the air drawn into each cylinder of the engine 90 from the intake manifold 20. Are mixed. As described above, in the intake device of the present embodiment, the branch pipes 24 of the intake manifold 20 meander in the direction of the cylinder rows of the engine 90, and their ends communicate with the surge tank 30. 30
Are shifted in the cylinder row direction of the engine 90 by half of the adjacent distance between the branch pipes 24. At the center of the surge tank 30, a throttle 40 and a passage communicating with the air cleaner unit 10 via the throttle 40 are provided. Therefore, these throttles 40
And the passage 50 are connected to the second branch pipe 2 of the intake manifold 20.
4 so that a tool space can be secured when working with a bolt or the like passing through the mounting portion 22 formed between the branch pipes 24. For this reason, even when the whole from the air cleaner section 10 to the intake manifold 20 is integrated, the engine 9
0 can be assembled, and the process can be simplified.

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 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 90. Also, throttle 40
Although the case has been described in which the throttle and the passage 50 are attached to the center of the surge tank 30, the throttle 40 and the passage 50 may be attached to a position shifted from the center.

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 intake device of the above-described embodiment, each branch pipe 2 of the intake manifold 20 is provided.
The air cleaner unit 10 and the surge tank 30 are spaced apart from each other with the mounting portion 22 at the end of the intake manifold 20 interposed therebetween in order to secure the length of the intake manifold 20 to some extent. In this case, the shapes of the surge tank 30 and the intake manifold 20 may be appropriately changed. FIG.
FIG. 3 is a diagram showing a structure of an intake device in which the shape of an intake manifold is changed. FIG. 4 is a sectional view taken along line IV-IV of FIG. As shown in these figures, the surge tank 30
By changing the position where each branch pipe 24 of the intake manifold 20 is pulled out from the intake manifold 20 and changing the shape of each branch pipe 24, each branch pipe 24 can be changed without changing the shape of other parts.
Can be lengthened, and the torque during low-speed rotation can be increased.

[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 diagram showing a structure of an intake device in which a shape of an intake manifold is changed.

FIG. 4 is a sectional view taken along line IV-IV shown in FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Air cleaner part 12 Intake port 20 Intake manifold 22 Mounting part 24 Branch pipe 30 Surge tank 40 Throttle 50 Passage 90 Engine

Claims (4)

[Claims] An air cleaner and a surge tank are arranged with a mounting portion provided at an end of an intake manifold interposed therebetween, and a passage connecting the air cleaner and the surge tank is provided in one of the intake manifolds. For the branch pipe
An intake device for an internal combustion engine, wherein the intake device is arranged so as to overlap in a direction parallel to an operation line of a mounting means of the mounting portion. 2. The intake device for an internal combustion engine according to claim 1, wherein the passage communicates with a center of the surge tank. 3. The intake device for an internal combustion engine according to claim 2, wherein the intake manifold has an even number of branch pipes. 4. The surge tank and the passage according to claim 2, wherein a center position of each of the surge tank and the passage is displaced from a center position of a cylinder row of the internal combustion engine. An intake device for an internal combustion engine, which is laid in a meandering manner in the cylinder row direction in accordance with the shift amount.