JP2000045893A - Intake device for engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure a space for arranging a long intake duct while reducing intake noise by increasing the length of the duct. SOLUTION: Intake air is fed into an air-cleaner casing 21 through intake ducts 22, 23. The duct 22 has an outer duct part located outside of the casing 21, and a piercing duct part 22b piercing through the casing 21. The duct 23 serving as an outside circulation duct part is formed in a U-like shape so as to be long, having its upstream end connected to the piercing duct part 22b, and its downstream end connected to the bottom wall of the casing 21 (that is, the inner space of the casing 21). Intake-air is sucked through the upstream end 22a of the duct 22, and is introduced through the piercing duct part 22b and the outside circulation duct part 23, and into the casing 21 in which the intake-air then flows through a filter element. Thereafter, the intake-air is introduced into an engine outside of the casing 1. A resonance chamber 24 as a sound suppressing means is connected to the outside circulation duct part 23.

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.

[0002]

2. Description of the Related Art In an intake system of an engine, particularly a diesel engine for an automobile, a noise reduction device such as a resonance chamber is provided for an intake duct upstream of a filter element in an air cleaner case in order to reduce intake noise. Some of the devices are connected to each other (Japanese Patent Laid-Open Nos. 5-1634, 3-3-1).
279644).

[0003]

Incidentally, in order to sufficiently reduce the intake noise, it is necessary to increase the volume of the air cleaner case, increase the length of the intake duct, and increase the volume of the resonance chamber. When adopting such an intake noise reduction method such as expansion of volume, there is a case where it is not possible to secure a sufficient space for sufficient volume expansion due to the arrangement space of the air cleaner case. In addition, when the length of the intake duct is lengthened, there may be a case where it is not possible to secure a sufficient extra space for the operation.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide an intake system for an engine which can effectively utilize a limited space and can sufficiently reduce intake noise. Is to provide.

[0005]

In order to achieve the above-mentioned object, the present invention adopts the following solution. That is, in an intake system for an engine provided with a muffler in an intake duct upstream of a filter element in an air cleaner case as described in claim 1 of the claims, the intake air upstream of the filter element is provided. The duct has a through duct portion penetrating the inside of the air cleaner case, and is arranged so as to be connected to the through duct portion and located outside the air cleaner case, and the duct is provided upstream of the filter element. A preferred embodiment based on the above solution is formed so as to have an external circulation duct portion communicated with the inside of the air cleaner case, and the external circulation duct portion is provided with the muffling means. It is as described in claim 2 and the following claims.

[0006]

According to the first aspect of the present invention, a part of the intake duct is housed in the air cleaner case in a penetrating manner while further reducing intake noise by making the intake duct longer by the external circulation duct portion. Thus, a long intake duct can be configured in a limited space. Of course, since the noise reduction means is connected to the external circulation duct, the noise reduction effect corresponding to this can sufficiently reduce the intake noise as a whole.

According to the second aspect, the external circulation duct portion and the muffling means can be disposed by effectively utilizing the extra space below the air cleaner case. In particular, it is suitable when the air cleaner case is provided in a narrow space formed immediately behind the wheel house. Claim 3
According to the present invention, the external circulation duct portion is disposed substantially below the air cleaner case so that each end thereof faces upward while the external circulation duct portion is substantially U-shaped. The external circulation duct portion is accommodated in the horizontal cross-sectional area of the case, which is preferable as an arrangement structure when the opening area of the lower space of the air cleaner case is small as a whole.

According to claim 4, of the automobile body,
There is provided a device capable of sufficiently reducing intake noise while effectively utilizing a narrow space surrounded by a high position panel portion, a wheel house portion, and a vertical panel portion. According to claim 5,
A more specific arrangement relationship between the engine and the air cleaner case is provided, and the invention can be applied particularly to an arrangement structure often adopted in a one-box car or a 1.5-box car.

According to the sixth aspect, the air cleaner case can be effectively used by effectively utilizing the space of the corner formed by the high position panel portion and the vertical direction panel portion, that is, the dead space.
An external circulation duct portion and a noise reduction means can be provided. According to the seventh aspect, the filter element can be easily approached by opening the upper case. Of course, there is no penetrating duct portion in the upper case, so that there is no problem in opening the upper case. Further, this is preferable in that the filter element and the upper case can be shared with a vehicle type having no through duct portion or external circulation duct portion.

According to the eighth aspect, the air cleaner case can be firmly supported by utilizing the partition wall. This is also preferable in that noise generated in the external circulation duct portion and the muffling section is cut off by the partition wall so as to minimize transmission to the passenger compartment side. According to the ninth aspect, a general resonance chamber can be used as the muffling means. Further, since the resonance chamber does not need to be set to a specific shape, it is preferable to form a shape that matches the shape of the surroundings and to sufficiently secure the volume and sufficiently reduce noise.

[0011]

1 and 2, an automobile 1 is shown.
Is a box car, the steering handle of which is denoted by reference numeral 12, the front wheel is denoted by reference numeral 14, the rear wheel is denoted by reference numeral 15, and the wheel house portion where the front wheel 14 is disposed is denoted by reference numeral 13.

The floor panel 2 constituting the bottom wall of the passenger compartment is composed of a high position panel 2a and a vertical panel 2 from the front to the rear.
b, having a low position panel portion 2c. High position panel 2a
Is disposed to extend in a substantially horizontal direction immediately above the wheel house portion 13, and is disposed on the high position panel portion 2a.
A driver's seat 11 and a passenger seat 19 as the front row seats are placed. The low position panel portion 2c is located slightly behind the wheel house portion 13 to the rear, and extends substantially horizontally at a position lower than the high position panel portion 2a. The vertical panel portion 2b extends in the vertical direction, and connects (connects) the high position panel portion 2a and the low position panel portion 2c.

Below the high position panel portion 2a, a pair of left and right panel members 16 and 17 extending in the up-down direction and the front-rear direction, respectively, are provided. That is, the engine (in the embodiment, the direct injection type
A diesel engine) EG is provided.

The space formed at the corner between the high position panel 2a and the vertical panel 2b, that is, below the high position panel 2a, in front of the vertical panel 2b and in the wheel house 13 In a space (wheel apron part space) X formed behind, an air cleaner AK is provided.
Are arranged. The air cleaner device AK has an air cleaner case 21 in which a filter element is housed as described later, and intake ducts 22 and 23 for guiding intake air to an upstream portion of the filter element in the case 21.

The intake duct 22 includes a case outer duct portion 22c located outside the case 21 and a through duct portion 22 located inside the case 21 and penetrating through the case 21.
b, and the upstream end of the outer case duct portion 22b is an intake inlet 22a. The intake duct 23 is
The case 2 is positioned below the case 21 so that one end thereof is connected to the through-duct portion 22b and the other end is connected to the upstream side of the filter element in the case 21.
1 is connected to the bottom wall. A resonance chamber (resonance chamber forming case) 24 as a sound deadening means is connected to the middle of the intake duct 23. The intake port 22a is set at a relatively high position so as to face the outside of the vehicle body.

The space X is vertically divided into two spaces X1 and X2 by a partition wall portion 18 extending in a substantially horizontal direction. The case 21 and the intake duct 22 are provided in the upper space X1, and the intake duct 23 and the resonance chamber 24 are provided in the lower space X2.

Next, the air cleaner case 21 and the intake duct 22 will be described in detail with reference to FIGS. First, the case 21 is composed of the lower case 21A and the upper case 2
1B. Lower case 21A
Inside, the filter element 21C extends substantially horizontally and is removably housed. The upper case 21B includes the filter element 21
C is openably and closably attached to lower case 21A so as to cover C from above. And, as will be described later,
After passing through the filter element 21C from inside the lower case 21A, it passes through the inside of the upper case 21B and is supplied to the engine EG from the outlet port 33 formed in the upper case 21B.

The aforementioned through-duct portion 22b is formed only in the lower case 21A. One end of the through duct portion 22b is connected to the outer case duct portion 22c from one side wall of the lower case 21A. The other end of the through duct portion 22b is opened downward from the bottom wall of the lower case 21A, and this downward opening end is formed as a connection end 31 to the intake duct 23 from the bottom wall of the lower case 21A. Are also projected slightly downward. And the lower case 21A
A connection opening 32 for the intake duct 23 is formed in a bottom wall of the lower case 21A, and the connection opening 34 is also formed to project slightly below the bottom wall of the lower case 21A.

Referring to FIG. 6 to FIG.
3. The resonance chamber 24 will be described in detail. First, the intake duct 23 has a substantially U-shape as a whole, and is provided with connection ends serving as both ends thereof facing upward. The upstream portion of the intake duct 23 that extends in the vertical direction and is connected to (the connection end 31 of) the through-duct portion 22b is indicated by reference numeral 23a, and extends in the vertical direction to form the lower case 21.
Reference numeral 23 denotes a downstream portion connected to the connection opening 32 of A.
b, the two portions 23a and 2
A connecting portion for connecting (connecting) 3b is indicated by reference numeral 23c. The resonance chamber 24 is connected (communicated) to the connecting portion 23c of the intake duct 23.

The air cleaner case 21 is placed on the partition wall 18 (in a state where the weight is supported).
The intake duct 23 and the resonance chamber 24 are fixed to the surrounding vehicle body panel members via brackets and the like. In addition, as shown in FIG.
The resonance chamber 24 is formed so as to extend below the front end of the low position panel portion 2c, but the shape itself can be appropriately set. The intake duct 23 has a shape that fits within a projection area range from above the case 21.

In the above embodiment, the intake air is
The air is introduced into the intake duct 22 from the inlet 22a of the intake duct 22, flows through the through duct portion 22b, and flows to (the upstream portion 22a of) the intake duct 23. The intake air introduced into the intake duct 23 is introduced into the lower case 21A through the connection portion 22c and the downstream portion 22b.
The intake air introduced into the lower case 21A is
After passing through 1C, it is introduced into the upper case 21B, and thereafter flows from the outlet 33 to the engine EG.

The intake duct is formed long, such as 22, 23. In particular, the noise reduction effect is enhanced by the through duct portion 22b formed by utilizing the space in the lower case 21A and the long intake duct 23 having a substantially U shape. Further, the resonance chamber 24 connected to the intake duct 23 further enhances the noise reduction effect. Since the through-duct portion 22b is disposed in the case 21, it is preferable in that the space for the through-duct portion 22b can be saved, and the sound insulation of the case 21 prevents leakage of intake noise from the through-duct portion 22b to the outside. Become.

The connection ends 31, 32 projecting downward from the bottom wall of the lower case 21A cooperate with the intake duct 23 to form an external circulation duct portion. (The connection seal members are fitted and held in advance at the connection ends 31 and 32. Can be provided on the intake duct 23 side). In addition, case 21
Is placed on the partition wall 18, the partition wall 18
By forming the fitting holes corresponding to the connection ends 31 and 32 in advance, the case 21 is automatically positioned when the connection ends 31 and 32 are fitted into the fitting holes. Will be.

Although the embodiment has been described above, the present invention is applied to an automobile such as a 1.5 box car,
A two-box car, a three-box car, a body form and a vehicle type form are not limited. Further, depending on the position of the air cleaner device AK, if there is a marginal space around the air cleaner case 21 on the side, the intake duct 2
For example, the direction in which the external circulation duct portion is disposed with respect to the case 21, such as extending to the side of the external circulation duct portion case 21, can be appropriately adopted. The engine is not limited to a diesel engine, but may be a spark ignition engine represented by a gasoline engine.

The intake duct 23 constituting the external circulation duct portion is not limited to a U-shape, and may be partially or largely curved so as to be disposed as long as possible by effectively utilizing the surrounding dead space. The shape can be set to an appropriate shape such as the shape of the shape. Also, the resonance chamber 2
The connection position of 4 to the external circulation duct portion may be an appropriate position such as an upstream portion or a downstream portion of the external circulation duct portion. The purpose of the present invention is not limited to what is explicitly specified, but also implicitly includes providing what is substantially preferred or expressed as an advantage.

[Brief description of the drawings]

FIG. 1 is an overall simplified side view showing an embodiment of the present invention.

FIG. 2 is a simplified front view of the embodiment shown in FIG.

FIG. 3 is a side view showing details of an air cleaner case portion.

FIG. 4 is a right side view of FIG. 3;

FIG. 5 is a plan view of FIG. 3;

FIG. 6 is a front view of an external circulation duct portion and a resonance chamber.

FIG. 7 is a right side view of FIG. 6;

FIG. 8 is a plan view of FIG. 6;

[Explanation of symbols]

 1: automobile 2: floor panel 2a: high position panel 2b: vertical panel 2c: low position panel 11, 19: front row seat 13: front wheel house 14: front wheel 18: partition wall 21: air cleaner Case 21A: Lower case 21B: Upper case 21C: Filter element 22: Intake duct 22a: Intake inlet 22b: Through duct portion 22c: Outer case duct portion 23: Intake duct (external circulation duct portion) 23a: Upstream portion 22b: Downstream part 22c: Connecting part 24: Resonance chamber (silencer) X: Space X1: Upper space X2: Lower space EG: Engine

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Yuji Togezaki 3-1 Shinchi, Fuchu-cho, Aki-gun, Hiroshima Prefecture F-term in Mazda Co., Ltd. (Reference) 3D038 BA01 BA12 BB03 BC03 BC07 BC11 BC15

Claims (9)

[Claims] 1. An air intake system for an engine, wherein a muffler is provided in an intake duct upstream of a filter element in an air cleaner case, wherein an intake duct upstream of the filter element penetrates through the air cleaner case. External circulating duct portion having a through duct portion, and being disposed so as to be located outside of the air cleaner case so as to be continuous with the through duct portion and communicating with the air cleaner case at an upstream side of the filter element. An air intake device for an engine, wherein the muffler is provided in the external circulation duct portion. 2. The vehicle according to claim 1, wherein the external circulation duct portion and the muffler are located below the air cleaner case, and the air cleaner case, the external circulation duct portion and the muffler are located immediately after the wheel house in the vehicle body. An intake device for an engine, wherein the intake device is disposed in a wheel apron part space located at a side. 3. The air circulation case according to claim 1, wherein the external circulation duct portion is formed in a substantially U-shape, and a downstream end of the through-duct portion is located upstream of the filter element in the air cleaner case. The outer circulation duct portion is open at the bottom wall portion thereof, and each end of the external circulation duct portion is disposed to face upward, and one end of the external circulation duct portion is connected to the downstream end of the through duct portion. The other end of the external circulation duct portion is connected to the inside of the air cleaner case from the bottom wall of the air cleaner case. 4. The high-position panel section according to claim 3, wherein the floor panel is located above a front wheel of the automobile and a front-row seat is placed thereon, and the rear panel is located behind the high-position panel section and the wheel house section. And it is set so as to have a low position panel portion located at a position lower than the high position panel portion, and a vertical panel portion extending in the vertical direction and connecting the high position panel portion and the low position panel portion. The air cleaner case, the external circulation duct portion, and the muffling means are disposed in a space formed below the high position panel portion, behind the wheel house portion, and in front of the vertical panel portion. An intake system for an engine. 5. The engine according to claim 4, wherein an engine to which intake air after passing through the filter element is supplied is provided between the left and right front wheels and at a position lower than the high position panel portion. Characteristic engine intake device. 6. The vehicle body according to claim 1, wherein the floor panel of the vehicle body has a high position panel portion, and a low position panel portion located behind the high position panel portion and lower than the high position panel portion. And a vertical panel portion extending in the vertical direction and connecting the high position panel and the low position panel portion, wherein the air cleaner case, the external circulation duct portion and the muffler are arranged in the vertical direction with the high position panel portion. An intake device for an engine, which is disposed in a corner space formed by a panel portion. 7. The air cleaner case according to claim 1, wherein the air cleaner case is detachably accommodated in the lower case, and the upper case is openably and closably attached to the lower case to cover the filter element from above. It is set so that the intake air passes through the filter element from inside the lower case and then flows into the upper case, and the through duct portion penetrates only through the lower case. An intake device for an engine, wherein intake air passing through the external circulation duct portion is set to be introduced into the lower case. 8. The vehicle body according to claim 4, wherein the vehicle body has a partition wall extending substantially horizontally below the high position panel portion and behind the wheel house portion, and a space above the partition wall portion. The air cleaner case is disposed, the external circulation duct portion and the muffling means are disposed in a space below the partition wall portion, and an upper end portion of the external circulation duct portion passes through the partition wall portion. An intake system for an engine. 9. An air intake system for an engine according to claim 1, wherein said muffling means is a resonance chamber connected to said external circulation duct portion.