JP2002371928A - Intake device of internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the attractiveness of the appearance of an air cleaner and facilitate the installation operation of attachments such as air cleaner on an internal combustion engine. SOLUTION: The air cleaner 21 arranged continuously to the extended end part 20 of an intake pipe 19 comprises a cleaner case 27 forming the outer shell of the air cleaner and an element 28 stored in the cleaner case 27 and filtrating air 13. The cleaner case 27 comprises a case body 31 connected to the extended end part 20 of the intake pipe 19, having an opening 30 opening toward the outside of the cleaner case 27, and allowing the element 28 to be extractably inserted therein through the opening 30, a case cover 32 openably closing the opening 30, and a fixing device 33 detachably fixing the case cover 32 to the case body 31. The device also comprises a cover body 52 detachably installed on the cleaner case 27 and covering the case cover 32 from the outside thereof.

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 having an intake pipe extending from an internal combustion engine and an air cleaner connected to an extension end of the intake pipe.

[0002]

2. Description of the Related Art There is a conventional intake device for an internal combustion engine constructed as follows.

That is, the intake device includes an intake pipe extending from the internal combustion engine, and an air cleaner connected to an extension end of the intake pipe and filtering air taken into the internal combustion engine through the intake pipe. The air cleaner includes: a cleaner case forming an outer shell thereof; and an element housed in the cleaner case and filtering the air.

Further, the cleaner case has an opening connected to the extending end of the intake pipe and opening outwardly of the cleaner case, and the element is inserted through the opening so as to be freely inserted and removed. A case body, a case cover that closes the opening so as to be openable and closable, and a fixture that detachably fixes the case cover to the case body are provided.

[0005] When the internal combustion engine is driven, the air on the atmosphere side is first sucked into the air cleaner by the suction action of the internal combustion engine, where it is filtered by passing through the element, and the filtered air is filtered. Is taken into the internal combustion engine through the intake pipe and is provided for combustion.

When the element is clogged due to the filtration of air, the case cover is removed from the case body by operating the fixing member from the outside of the air cleaner, and the element is pulled out through the opening. Purification or replacement with a new one is performed.

In the above structure, a drain hole is formed at the bottom of the cleaner case, and water collected inside the air cleaner is discharged to the outside through the drain hole. Thus, the water collected inside the air cleaner is prevented from being sucked into the internal combustion engine.

[0008]

However, the above-mentioned conventional technology has the following problems.

That is, the fixing tool is operable from the outside of the air cleaner when the case cover is attached to and detached from the case main body, and is disposed at a position easily visible from the outside of the air cleaner. I have. In addition, since the case cover needs to be firmly fixed to the case body, usually, a plurality of the fixing tools are provided. However, such fasteners that are easily visible in appearance are not preferable because they reduce the appearance of the air cleaner.

Therefore, it is conceivable to provide a cover body for covering the case cover from the outside. However, if this is done simply, when the work of assembling the air cleaner and the cover body to the internal combustion engine is performed, this assembling work is performed. Need to be individualized, which is complicated.

On the other hand, as described above, a drain hole is formed at the bottom of the cleaner case, but when the air cleaner is installed outdoors, the drain hole passes through the drain hole,
Outdoor rainwater may enter the inside of the air cleaner.

In addition, since the inside of the air cleaner becomes negative pressure due to the suction action by the driving of the internal combustion engine,
There is a possibility that penetration of rainwater into the air cleaner may be promoted through the drain hole.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has been made to improve the external appearance of an air cleaner and to facilitate the work of assembling accessory parts such as the air cleaner to an internal combustion engine. The task is to

It is another object of the present invention to form a drain hole for discharging water remaining inside the air cleaner to the outside, and to prevent external water from entering the inside of the air cleaner through the drain hole. And

[0015]

An intake device for an internal combustion engine according to the present invention for solving the above-mentioned problems is as follows.

According to the first aspect of the present invention, the intake pipe 19 extending from the internal combustion engine 12 is connected to the extension end 20 of the intake pipe 19 and is drawn into the internal combustion engine 12 through the intake pipe 19. An air cleaner 21 that filters the air 13; the air cleaner 21 includes a cleaner case 27 that forms an outer shell thereof; and an element 28 that is housed in the cleaner case 27 and filters the air 13;
The cleaner case 27 has an opening 30 connected to the extending end 20 of the intake pipe 19 and opening outward of the cleaner case 27. The element 28 can be inserted and removed through the opening 30 through the opening 30. Case body 31 to be inserted
And a case cover 32 for opening and closing the opening 30 freely.
And a fixing device 33 for detachably fixing the case cover 32 to the case main body 31.

There is provided a cover body 52 which is detachably attached to the cleaner case 27 and covers the case cover 32 from the outside.

According to a second aspect of the present invention, in addition to the first aspect of the present invention, there is provided an intake system for an internal combustion engine, wherein a drain hole 48 is formed in a bottom portion of the cleaner case 27.

A portion 53 of the cover body 52 covers the drainage hole 48 from below, and the cleaner case 2
A gap 54 that opens toward the outside of the air cleaner 21 is provided between the lower surface of the bottom of the cover 7 and the upper surface of a portion 53 of the cover body 52.

According to a third aspect of the present invention, in addition to the second aspect of the invention, there is provided an intake system for an internal combustion engine mounted on the vehicle

The gap 54 is opened toward the front and rear of the vehicle 1.

[0022]

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 2, reference numeral 1 denotes a vehicle, more specifically, a motorcycle which is a straddle-type vehicle. The arrow Fr indicates the front of the vehicle 1.

The vehicle 1 has a body frame 2, a front wheel (not shown) supported on a front end of the body frame 2, and a pivotal support at the rear end of the body frame 2 so as to be vertically swingable. A power unit 4 which is a driving source for traveling pivotally supported by a shaft 3, a rear wheel 5 supported on a swing end of the power unit 4, and a swing end of the power unit 4 The vehicle 1 includes a shock absorber 6 supported by the vehicle body frame 2 and a seat 7 supported by a rear upper portion of the vehicle body frame 2 so that a rider can sit in a saddle-riding manner. 8, and can travel on the traveling road surface 8.

In all the drawings, the power unit 4 constitutes a front part thereof and has an internal combustion engine 1 mounted on the vehicle 1.
2, an intake device 14 that can introduce a mixture of atmospheric air 13 and fuel into the internal combustion engine 12, and a power transmission that constitutes a rear part of the power unit 4 and is connected to the internal combustion engine 12 A rear wheel 5 is supported at a rear end of the power unit 4, and the rear wheel 5 is connected to the internal combustion engine 12 via the power transmission device 15.

The intake device 14 extends upward from an upper surface of a cylinder 18 of the internal combustion engine 12 and then extends rearward, and an extension end 2 of the intake pipe 19.
0, an air cleaner 21 for filtering air 13 sucked into the cylinder 18 through the intake pipe 19,
A carburetor 22 is provided at an intermediate portion in the longitudinal direction of the intake pipe 19 and supplies fuel to the air 13 passing through the intake pipe 19 to generate an air-fuel mixture.

The air cleaner 21 has a resin-made cleaner case 27 which constitutes an outer shell thereof and is detachably fixed to the upper surface of the power unit 4 via a buffer 25 by fastening with a fastener 26, and the cleaner case 27. And an element 28 that is housed in the inside and filters the air 13. The element 28 has a substantially cylindrical shape.

The cleaner case 27 is provided with the intake pipe 1.
A case main body 31 having an opening 30 connected to the extension end 20 of the vehicle 9 and fixed to the power unit 4 as described above, and opening outward of the cleaner case 27 and outward of the vehicle 1; A case cover 32 for closing the opening 30 so as to be openable and closable, and a plurality (three) of fixing members 33 for detachably fixing the case cover 32 to the case main body 31 by fastening are provided.

Each of the fasteners 33 can be operated from the outside of the vehicle 1. If the case cover 32 is removed from the case body 31 by a loosening operation on each of the fasteners 33, the opening 30 is opened. The vehicle 1 is opened outward. In this state, the above element 2
Numeral 8 can be inserted into and removed from the case main body 31 through the opening 30.

In cooperation with the case cover 32, there is provided a guide cover 35 which enables the element 28 to be supported by the cleaner case 27 and covers the outer peripheral surface of the element 28. The guide cover 35 is fixed to the case main body 31, and the outer peripheral surface of the element 28, the case cover 32 with the opening 30 closed, and the guide cover 35 form a closed annular upstream space 36. The upstream space 36 is formed and communicated with the outside of the air cleaner 21 by another intake pipe 37. On the other hand, the interior of the element 28 is defined as a downstream space 38, and the downstream space 38 extends through the through hole 39 formed in the guide cover 35 and the inside of the cleaner case 27 to extend the end portion of the intake pipe 19. 20.

An oil separator 42 is formed by a part of the air cleaner 21. The outer shell of the oil separator 42 is formed by a part 43 of the case body 31, and an element 44 is provided inside the part 43. When the blow-by gas 45 from the internal combustion engine 12 passes through the element 44, oil is separated. Thereafter, the blow-by gas 45 is sucked into the internal combustion engine 12 through the intake pipe 19, while the separated oil is stored in the oil storage pipe 46.

At the bottom of the case body 31, which is the bottom of the cleaner case 27, a drain hole 48 is formed to communicate the inside of the case body 31 below the bottom of the cleaner case 27, and the cleaner case inside the air cleaner 21 is formed. The water 49 that is going to accumulate at the inner bottom of the 27 is drained to the lower outside of the cleaner case 27 through the drain hole 48 by natural flow.

When the internal combustion engine 12 is driven, the air 13 on the atmosphere side is first sucked into the air cleaner 21 by the suction action of the internal combustion engine 12, and the upstream side space 36 in the cleaner case 27 The air is filtered by passing through the element 28 toward the downstream space 38, and the filtered air 13 is sucked into the internal combustion engine 12 through the intake pipe 19. At the same time, fuel is supplied from the carburetor 22 to the air 13 passing through the intake pipe 19 to generate an air-fuel mixture, and the air-fuel mixture is sucked into the internal combustion engine 12 and used for combustion. On the other hand, the blow-by gas 45 passed through the oil separator 42 is also sucked into the internal combustion engine 12 through the intake pipe 19 and used for combustion.

The driving force of the internal combustion engine 12 generated by the combustion is transmitted to the rear wheels 5 via the power transmission device 15 so that the vehicle 1 can travel on the traveling road surface 8.

The case cover 3 of the cleaner case 27
2 is a resin-made bowl-shaped cover body which is detachably attached to the mounting member 51 by a mounting member 51 and covers the case cover 32 together with at least a part of the plurality of fixing members 33 so as to fit from the outside thereof. 52 are provided.

According to the above configuration, the case cover 32 is
The cover body 52 is covered by the cover body 52 together with a plurality of fixing members 33 provided for fixing the case cover 32, and the cover body 52 is separate from the case cover 32, and its shape can be variously selected. Therefore, according to the cover body 52, the appearance of the air cleaner 21 can be sufficiently improved in appearance. Since the cover 52 merely covers the case cover 32 and the fixing member 33 and can be reduced in weight, the number of the mounting members 51 that enable the cover 52 to be mounted on the cleaner case 27 is small and small. Therefore, regardless of the presence of the mounting tool 51, as described above, the air cleaner 21
This improves the appearance of the device.

As described above, since the cover body 52 is detachably attached to the cleaner case 27, the cleaner case 27 and the cover body 52 with respect to the extension end 20 of the intake pipe 19 on the internal combustion engine 12 side. When trying to assemble, in any large work space,
The cover body 52 may be attached to the cleaner case 27 in advance, and then these combined bodies 27 and 52 may be attached to the extension end 20 of the intake pipe 19 on the side of the internal combustion engine 12.

Therefore, compared to the case where the cleaner case 27 and the cover body 52 are separately mounted on the internal combustion engine 12 side, the cleaner case 2
7 and the cover body 52 can be easily assembled.

When the internal combustion engine 12 is driven, the air cleaner 21 and the intake pipe 19 pass through the internal combustion engine 12.
When the air 13 is sucked into the air cleaner, intake noise is generated. However, the noise directed to the outside of the air cleaner 21 is suppressed by the cover body 52.

Therefore, the cover 52 is also useful in preventing the intake noise.

Further, in the above configuration, the lower end portion 53 of the cover body 52 covers the drainage hole 48 from below, and the lower surface of the bottom of the case body 31 of the cleaner case 27 and the cover body 52 A clearance 54 is provided between the upper surface of a portion 53 of the cleaner 52 and the outer surface of the cleaner case 27. This gap 54
Are opened toward the front and rear of the vehicle 1 and toward the center of the vehicle body in the width direction (lateral direction) of the vehicle 1.

According to the above configuration, it is prevented that the external rain water 56 jumped up from the traveling road surface 8 side when the vehicle 1 travels passes through the drain hole 48 and enters the inside of the air cleaner 21. . On the other hand, the water 49 that tends to accumulate at the inner bottom of the cleaner case 27 is discharged to the outside of the air cleaner 21 through the drain hole 48 and the gap 54.

Therefore, the water 49 accumulated inside the air cleaner 21 is prevented from being sucked into the internal combustion engine 12, and the engine performance is kept good.

The water 49 is prevented from penetrating into the air cleaner 21 through the water drain hole 48 by using the part 53 of the cover body 52. Is achieved in.

The internal combustion engine 12 is mounted on the vehicle 1, and the gap 54 is opened toward the front and rear of the vehicle 1.

Therefore, the traveling wind 57 when the vehicle 1 travels vigorously passes rearward through the gap 54, so that a negative pressure tends to be generated in the gap 54.

Therefore, even if the inside of the air cleaner 21 becomes a negative pressure due to the suction action by the driving of the internal combustion engine 12, the infiltration of the rainwater 56 from the outside to the inside of the air cleaner 21 through the drain hole 48 is prevented. Is done.

The upper surface of a portion 53 of the cover body 52 is inclined backward and downward.

Therefore, the water 49 that has fallen on the upper surface of the part 53 through the drain hole 48 flows backward on the upper surface of the part 53 without being opposed to the traveling wind 57 and is smoothly discharged. .

Therefore, it is possible to more reliably prevent the water 49 discharged through the drain hole 48 from flowing back through the drain hole 48 and entering the inside of the air cleaner 21.

Although the above description is based on the illustrated example, the mounting tool 51 may be a locking tool. The cover body 52 may be attached to the case body 31.

[0052]

The effects of the present invention are as follows.

According to a first aspect of the present invention, there is provided an intake pipe extending from an internal combustion engine, and an air cleaner connected to an extension end of the intake pipe and filtering air taken into the internal combustion engine through the intake pipe. The air cleaner comprises: a cleaner case forming an outer shell thereof; and an element accommodated in the cleaner case for filtering the air, and wherein the cleaner case is provided at an extending end of the intake pipe. A case body having an opening that is connected to the cleaner case and opens toward the outside of the cleaner case, through which the element is inserted so as to be able to be inserted and removed, a case cover that closes the opening so that it can be opened and closed, and this case cover And a fixing tool for detachably fixing the case body to the case main body.

A cover body is provided which is detachably attached to the cleaner case and covers the case cover from the outside.

For this reason, the case cover is covered with the cover body together with a fixing tool usually provided for fixing the case cover, and the cover body is separate from the case cover. The shape can be variously selected.

Therefore, according to the cover, the appearance of the air cleaner can be sufficiently improved.

Further, as described above, since the cover body is detachably attached to the cleaner case, when assembling the cleaner case and the cover body to the internal combustion engine side, the cover body can be arbitrarily widened in a wide work space.
Attach the cover body to the cleaner case in advance, then
What is necessary is just to attach these combined bodies to the extended end part of the intake pipe which is the said internal combustion engine side.

Therefore, as compared with the case where the cleaner case and the cover body are individually mounted on the internal combustion engine side, the work of assembling the cleaner case and the cover body on the internal combustion engine side can be easily performed.

When the internal combustion engine is driven, intake noise is generated as air is sucked into the internal combustion engine through the air cleaner and the intake pipe. Is suppressed by the cover body.

Therefore, the cover is useful in preventing the intake noise.

According to a second aspect of the present invention, there is provided an intake device for an internal combustion engine, wherein a drain hole is formed in a bottom portion of the cleaner case.

A part of the cover body covers the drain hole from below, and is opened outwardly of the air cleaner between the lower surface of the bottom of the cleaner case and the upper surface of a part of the cover body. A gap is provided.

Therefore, it is possible to prevent external water from entering the inside of the air cleaner through the drain hole. On the other hand, water that is going to collect at the inner bottom of the cleaner case is discharged to the outside of the air cleaner through the drain hole and the gap.

Therefore, the water collected inside the air cleaner is prevented from being sucked into the internal combustion engine, and the engine performance is kept good.

Further, the above-mentioned prevention of the intrusion of water into the air cleaner through the drain hole is achieved with a simple structure by using a part of the cover body, thereby preventing an increase in the number of parts.

A third aspect of the present invention relates to an intake device for an internal combustion engine mounted on a vehicle.

The gap is opened toward the front and rear of the vehicle.

For this reason, since the traveling wind when the vehicle travels passes through the gap toward the rear, a negative pressure tends to be generated in the gap.

Therefore, even if the inside of the air cleaner becomes a negative pressure due to the suction action by the driving of the internal combustion engine, intrusion of water from the outside to the inside of the air cleaner through the drain hole is prevented.

[Brief description of the drawings]

FIG. 1 is a partially enlarged view of FIG. 2;

FIG. 2 is a simplified rear side view of a vehicle.

FIG. 3 is a sectional view taken along line 3-3 in FIG. 1;

FIG. 4 is a partially enlarged sectional view of FIG. 1;

FIG. 5 is a sectional view taken along line 5-5 in FIG. 4;

DESCRIPTION OF SYMBOLS 1 Vehicle 2 Body frame 4 Power unit 12 Internal combustion engine 13 Air 14 Intake device 19 Intake pipe 20 Extension end 21 Air cleaner 27 Cleaner case 28 Element 30 Opening 31 Case body 32 Case cover 33 Fixing tool 48 Drainage Hole 49 Water 51 Fixture 52 Cover body 53 Part 54 Gap 56 Rain water 57 Running wind

Claims (3)

[Claims] An intake pipe extending from an internal combustion engine, and an air cleaner connected to an extension end of the intake pipe and filtering air taken into the internal combustion engine through the intake pipe,
The air cleaner includes a cleaner case forming an outer shell thereof, and an element housed in the cleaner case and filtering the air, and the cleaner case is connected to an extension end of the intake pipe. A case main body having an opening that opens toward the outside of the cleaner case and through which the element is inserted so that the element can be inserted and removed, a case cover that closes the opening so that it can be opened and closed, and An intake device for an internal combustion engine, comprising: a fixing device detachably fixed to a main body; a suction device for the internal combustion engine, the cover device being detachably attached to the cleaner case and covering the case cover from the outside. . 2. An intake device for an internal combustion engine, wherein a drain hole is formed in a bottom portion of the cleaner case, wherein a part of the cover body covers the drain hole from below, and a lower surface of a bottom portion of the cleaner case; 2. The intake device for an internal combustion engine according to claim 1, wherein a gap that opens toward the outside of the air cleaner is provided between the upper surface of a part of the cover body and the upper surface. 3. The intake device for an internal combustion engine mounted on a vehicle according to claim 2, wherein the gap is opened toward a front and a rear of the vehicle.