JP2002098016A - Intake device for engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the number of parts, simplify the structure and lower the cost of an intake device for an engine by effectively utilizing a dead space between a vehicle body wall surface and a vehicle body frame and dispensing with the separate arrangement of a drain hole and a valve in an air cleaner. SOLUTION: An air cleaner is aligned longitudinally with a vehicle body frame and disposed between a vehicle body wall surface and the vehicle body frame. The bottom of the air cleaner has a downwardly opening fresh air inlet, to which an intake duct is connected.

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 engine, and more particularly to an intake device for an engine in which an air cleaner is laid out at a lower portion of a vehicle.

[0002]

2. Description of the Related Art In a vehicle, an engine room ER is provided below a driver's seat (not shown) as shown in FIG.
The engine 102 is arranged in the engine room ER,
An intake manifold 104 connected to the engine 102 is provided to be directed rightward, a throttle body 106 is mounted on the upstream side of the intake manifold 104, and one end of an air cleaner hose 108 is provided on the throttle body 106. An air cleaner 110 is connected to the other end of the hose 108, and the entire intake system from the air cleaner 110 to the engine 102 is disposed so as to be directed left and right. The air cleaner 110 is disposed near the right side frame 112 which is a body frame, and
02 is to filter the intake air taken in. The air cleaner 110 is provided with a fresh air intake hose 114. The air cleaner hose 108 has a bellows 108A to absorb the movement of the engine 102.
And a side branch resonator 116 is provided to reduce intake noise.

When an engine (not shown) is arranged below a driver's seat 202, as shown in FIG. 8, as compared with a case where an engine is arranged in an engine room, an air cleaner 204 is closer to the ground. Since water easily enters the inside of the air cleaner 204, as shown in FIG. 9, a drain hole 206 is formed in the bottom surface portion 204A of the air cleaner 204, and the drain hole 206 is opened and closed. A rubber drain valve 208 is provided. The water drain valve 208 is attached to a valve mounting hole 210 of the bottom surface 204A of the air cleaner 204, and closes by a negative pressure generated by suction of the intake air into the air cleaner 204 when the engine is driven. While the drain hole 206 is closed, when the engine is not driven, the intake air is not sucked into the air cleaner 204 and no negative pressure is generated, so the opening operation is performed to open the drain hole 206.

[0004] Such an intake system for an engine is disclosed, for example, in Japanese Patent Application Laid-Open No. 5-26123. The one described in this publication introduces outside air from the lower surface side of a plate-shaped cleaner element to prevent accumulation of dust and the like, and also provides an outside air side opening and an engine side opening in a lower case, This facilitates the attachment and detachment of the case.

[0005]

However, conventionally, when the engine is disposed below the driver's seat, the engine room below the driver's seat is smaller than the engine room formed in front of the driver's seat. In order to reduce the intake noise by increasing the volume of the air cleaner, the resonator and the like, there is a disadvantage that the installation space for the air cleaner and the resonator cannot be secured. In addition, if the length of each branch of the intake manifold is increased in order to increase the filling efficiency, the length of the air cleaner hose will be shortened, making it difficult to install a resonator on the air cleaner hose, thus reducing the noise reduction performance. There is a disadvantage that it is difficult to improve the quality.

[0008] As shown in FIGS. 8 and 9, it is necessary to attach a special water drain valve to an air cleaner disposed substantially below a vehicle in order to drain water that has entered by submersion or the like. For this reason, the number of components increases, and the configuration of the air cleaner becomes complicated, and the cost increases.

[0007]

SUMMARY OF THE INVENTION Therefore, in order to eliminate the above-mentioned disadvantages, the present invention provides an engine room below a driver's seat of a vehicle, arranges an engine in the engine room, and draws the engine into the engine room. An air cleaner for filtering intake air to be taken, and an intake device for an engine provided with an intake duct connected to the air cleaner, wherein the air cleaner is aligned with a vehicle body frame in a longitudinal direction, and is disposed between a wall surface of the vehicle body and the vehicle body frame. And a fresh air introduction port to which the intake duct is connected is provided at the bottom of the air cleaner so as to open downward.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS According to the present invention, an air cleaner is disposed between a wall surface of a vehicle body and a vehicle body frame in such a manner that a longitudinal direction of the air cleaner coincides with a body frame, and an intake duct is connected to a bottom portion of the air cleaner. Since the air inlet is opened downward, the dead space between the wall of the body and the body frame can be used effectively, and the fresh air inlet also functions as a drain. Since it is not necessary to separately provide a drain hole and a drain valve in the air cleaner, the number of parts can be reduced, the configuration can be simplified, and the cost can be reduced.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention; 1 to 4 show a first embodiment of the present invention. 4, reference numeral 2 denotes a vehicle, 4 denotes an engine mounted on the vehicle 2, 6 denotes a right side frame which is a body frame directed to the front and rear direction on the right side of the vehicle 2, 8 denotes a vehicle body (body outer plate), 10 Is a vehicle body floor. As shown in FIG. 4, the engine 4 is disposed in an engine room ER provided below a driver's seat (not shown).

The engine 4 is provided with a downstream side which is one end side of the intake manifold 12 connected thereto. The intake manifold 12 is directed rightward on the right side frame 6 side, and has a throttle body 14 mounted upstream on the other end side. Further, a downstream side of one end of the air cleaner hose 16 is connected to the throttle body 14 on the right side frame 6 side. This air cleaner hose 1
Numeral 6 is arranged rightward and connects an air cleaner 18 to the upstream side on the other end side. Air cleaner hose 16
In order to absorb the movement of the engine 4, the bellows 16
A is provided.

As shown in FIG. 3, the air cleaner 18 has a filter element 22 in a cleaner case 20 for filtering the intake air taken into the engine 4, and as shown in FIG. And a longitudinal direction X, and a dead space S between the wall surface 8A of the vehicle body 8 and the right side frame 6.
1 and is fixed on the vehicle body floor 10. Therefore, the air cleaner 18 is laid out at a considerably lower portion.

A fresh air inlet 24 is provided at the bottom 18A of the air cleaner 18 so as to open downward. Also,
Corresponding to the fresh air inlet 24, the vehicle body floor 10
A floor side opening 26 is formed. The fresh air inlet 24 is provided with a floor side opening 2 from below the vehicle body floor 10.
6, the downstream side of one end side of the intake duct 28 is connected and provided.

On the other hand, as shown in FIG. 1, a frame side opening 30 is formed in the right side frame 6 at a frame extension 6A extending slightly above the air cleaner 18 on the rear side of the vehicle 2. The upstream side of the other end of the intake duct 28 is connected to the frame side opening 30 from the outside to the inside of the right side frame 6. An intake passage 32 is formed in the right side frame 6.

The intake duct 28 is a dead space S between the vehicle body 8 and the right side frame 6 and below the vehicle body floor 10 that defines the vehicle interior 34 and the vehicle exterior 36.
2 is laid out. In other words, the intake duct 28 has a cleaner-side end 28-1 linearly extending from the bottom surface 18 </ b> A of the air cleaner 18 in a substantially vertical state to the vicinity of the lower end surface of the right side frame 6, and a lower part of the right side frame 6. An intermediate portion 28-2 extending horizontally behind the vehicle 2 along the end surface, a rising portion 28-3 extending substantially vertically to near the upper end surface of the right side frame 6, and a right side portion A frame-side end 28-4 extending along the right side frame 6 near the upper end surface of the frame 6.

Accordingly, fresh air to the air cleaner 18 is sucked from the intake passage 32 in the right side frame 6 through the frame side opening 30 and guided to the intake duct 28.
The air is introduced into the air cleaner 18 from the fresh air inlet 24 of the bottom portion 18A of the air cleaner 18.

The intake duct 28 is provided with an intermediate portion 28-2 fixed to the vehicle body floor 10 by a duct bracket 38. The duct bracket 38 is attached to the lower surface of the vehicle body floor 10 by floor-side mounting bolts 42, 42 inserted into the floor-side bolt holes 40, 40 on one side. The fixing brackets 44, 44 fixed to the portion 28-2 are mounted by duct-side mounting bolts 46, 46.

The intake duct 28 is provided with front and rear resonators connected to a duct bracket 38 on the front side and the rear side of the vehicle 2.

That is, the intermediate portion 28-2 of the intake duct 28
In the front space S3, which is a dead space on the front side of the vehicle 2, one end of a resonator pipe 48 oriented horizontally in the vicinity of the lower end surface of the right side frame 6 is provided. This resonator pipe 48
On the other end side, a large-capacity Helmholtz resonator 50 is connected and provided as a resonator on the front side.
The Helmholtz resonator 50 has a front space S3.
The longitudinal direction is arranged along the right side frame 6 in the horizontal direction. A resonator bracket 52 is fixed to the upper end of the Helmholtz resonator 50. Bracket 5 for this resonator
2 is fixed to the lower surface of the vehicle body floor 10 by a mounting bolt 54 for a resonator.

The frame-side end 2 of the intake duct 28
8-4, one end side of a side branch resonator 56 is provided as a rear side resonator in a rear space S4 which is a dead space on the rear side of the vehicle 2 with respect to the rising portion 28-3. The side branch resonator 56 is smaller in capacity than the Helmholtz resonator 50, has a different muffling frequency, and has a rising portion 28-.
3, and the front end is disposed near the lower end surface of the right side frame 6.

Next, the operation of the first embodiment will be described.

The fresh air sucked into the air cleaner 18 from the intake passage 32 inside the right side frame 6 is introduced through the intake duct 28 from the fresh air inlet 24 of the bottom portion 18A. At this time, the pulsation of the intake air in the intake duct 28 is suppressed by the Helmholtz resonator 50 and the side branch resonator 56, so that the generation of intake noise is reduced.

When water accumulates in the air cleaner 18, it flows downward from the fresh air inlet 24 of the bottom portion 18A as shown in FIG.

As a result, the air cleaner 18 is disposed so as to coincide with the right side frame 6 in the longitudinal direction X, and is disposed between the wall surface of the vehicle body 8 and the right side frame 6 as the vehicle frame. A fresh air inlet 2 to which an intake duct 28 is connected is provided on a bottom portion 18A of the air intake 18.
4, the air cleaner 18 is provided in the dead space between the wall surface of the vehicle body 8 and the right side frame 6, so that the dead space can be effectively used. The inlet 24 can function as a drain, and it is not necessary to separately provide a drain hole or a valve in the air cleaner 18, so that the number of parts can be reduced, the configuration can be simplified, and the cost can be reduced. , To improve the airtightness of the air cleaner 18 alone,
The noise reduction performance can be improved.

The intake duct 28 is connected to the right side frame 6, and an intake passage 32 is formed in the right side frame 6, so that the fresh air inlet 24 is connected to the right side frame 6 through the intake duct 28. An opening is provided in the closed space of the frame 6 to prevent impurities such as mud and snow from being sucked from the fresh air inlet 24.

Further, the intake duct 28 is provided between the vehicle body 8 and the right side frame 6 and between the vehicle interior 34 and the exterior 38.
By disposing below the vehicle body floor 10 that partitions the vehicle, the space in the passenger compartment 34 can be formed wider,
Effective use of space can be achieved.

Furthermore, the intake duct 28 is fixed to the vehicle body floor 10 via a duct bracket 38, and the intake duct 28 has a front side and a rear side of the vehicle 2 with respect to the duct bracket 38. Since the Helmholtz resonator 50 and the side branch resonator 56 are connected and provided as the rear side resonator, the vehicle body floor 10
A large resonator can be laid out in the dead space below the fin, and a plurality of resonators having different silencing frequencies can be arranged in a well-balanced manner, and the silencing performance can be further improved.

FIG. 5 shows a special structure of the present invention.
It shows an embodiment.

In the following embodiment, portions having the same functions as those in the above-described first embodiment will be described with the same reference numerals.

The features of the second embodiment are as follows. That is, the right side frame 6 is provided with the impurity infiltration preventing body 62 so as to cover the frame opening 30 to which the intake duct 28 is connected from the near side. A plurality of passage holes (not shown) are formed in the impurity infiltration preventive body 62, and impurity guide members 62A inclined downward with respect to the flow of air are arranged in a plurality of stages.

According to the structure of the second embodiment, when air reaches the impurity infiltration preventing body 62, impurities such as water are guided downward by the impurity guiding member 62A, so that impurities can be easily removed. it can.

FIG. 6 shows a special configuration of the present invention.
It shows an embodiment.

The features of the third embodiment are as follows. That is, in front of the entrance of the intake duct 28, the first and second air introduction bodies 72-1 and 72-2 are arranged in series with a space therebetween, and the first and second air introduction bodies 72-1 and 72-1 are introduced in series. A gap 74-1 for dropping the first impurity is formed between the first air introduction body 72-2 and the second air introduction body 72-2.
A first impurity dropping gap 74-1 is formed between the first impurity dropping portion and the inlet portion of the intake duct 28. The first air introduction body 72-1 and the second air introduction body 72-2 are provided so that air can be easily introduced.
The inlet side has a larger diameter than the outlet side. The inlet portion of the intake duct 28 is formed to have the same diameter as the inlet portions of the first and second air introduction bodies 72-1 and 72-2.

According to the configuration of the third embodiment, the fresh air
The air is guided by the first and second air introduction bodies 72-1 and 72-2 and flows into the intake duct 28. At this time, impurities such as water contained in the fresh air fall from the first and second impurity dropping gaps 74-1 and 74-2 and flow downward by the gravity thereof. Invasion can be prevented. In this case, the first and second air introduction bodies 72-1 and 72-2 are moved in the axial direction to overlap the first and second air introduction bodies 72-1 and 72-2. The second air introduction body 72-2 and the intake duct 28
First, by overlapping the entrance site of
By adjusting the second impurity drop gaps 74-1 and 74-2,
Impurities can be effectively removed.

In the present invention, a drain valve mechanism such as a check valve for discharging the water that has flowed down is provided in an intermediate portion, which is a low portion of the intake duct, so that the water can be actively discharged to the outside. It is.

[0035]

As is apparent from the above detailed description, according to the present invention, the air cleaner is arranged between the wall surface of the vehicle body and the vehicle body frame while making the longitudinal direction of the air cleaner coincide with the vehicle body frame. Has a fresh air inlet that is connected to the intake duct at the bottom, making it possible to effectively use the dead space between the body frame wall and the body frame. The opening can be made to function as a drain, and there is no need to separately provide a drain hole or a valve in the air cleaner, so that the number of parts can be reduced, the configuration can be simplified, and the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a side view of an intake device of a vehicle.

FIG. 2 is a front view of an intake device of the vehicle.

FIG. 3 is a schematic sectional view of an air cleaner.

FIG. 4 is a plan view of the intake device of the vehicle.

FIG. 5 is a partial side view of an intake device of a vehicle in a second embodiment.

FIG. 6 is a partial perspective view of a vehicle air intake device according to a third embodiment.

FIG. 7 is a plan view of a conventional vehicle air intake device.

FIG. 8 is a side view of a conventional vehicle air intake device.

FIG. 9 is a cross-sectional view in which a drain valve is conventionally attached to the bottom surface of an air cleaner.

[Explanation of symbols]

 2 Vehicle 4 Engine 6 Right side frame 10 Body floor 18 Air cleaner 24 Fresh air inlet 28 Intake duct 32 Intake passage 38 Duct bracket 50 Helmholtz resonator 56 Side branch resonator

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F02M 35/16 F02M 35/16 S J35 / 10 301V

Claims (5)

[Claims] An engine room is provided below a driver's seat of a vehicle, an engine is arranged in the engine room, an air cleaner for filtering intake air taken into the engine is provided, and an intake duct connected to the air cleaner is provided. In the provided air intake device for an engine, the air cleaner is disposed between a wall surface of the vehicle body and the vehicle body frame while the longitudinal direction of the air cleaner is aligned with the vehicle body frame, and the air intake duct is connected to a bottom surface of the air cleaner. An intake device for an engine, wherein a fresh air inlet is provided opening downward. 2. The engine intake system according to claim 1, wherein the intake duct is connected to the vehicle body frame, and an intake passage is formed in the vehicle body frame. 3. The air intake duct is disposed between the vehicle body and the vehicle body frame and below a vehicle body floor that separates a vehicle compartment from the outside of the vehicle.
An intake device for an engine according to Claim 1. 4. The intake duct is fixed to the vehicle body floor via a duct bracket, and the intake duct is provided at a front side and a rear side of the front and rear sides of the vehicle with respect to the duct bracket. 4. The intake device for an engine according to claim 3, wherein the resonators are connected to each other. 5. The vehicle body frame covers a frame side opening to which the intake duct is connected from a near side,
The intake device for an engine according to claim 2, further comprising an impurity intrusion prevention member provided with an impurity guide member.