JP5525276B2 - Intake device for internal combustion engine - Google Patents

Description

  The present invention relates to an intake device for an internal combustion engine, and more particularly to a layout of an intake system for improving soundproofing.

  Conventionally, various structures have been proposed in order to enhance the quietness in the interior of an automobile and promote high quality. For example, some sound insulation materials are installed on the bulkhead between the engine room and the passenger compartment, but the material becomes expensive or increases in weight when used in large quantities to improve sound insulation. There is a problem. Moreover, although it is effective to reduce the radiated sound from the engine, there is a problem that it takes enormous costs and time to change the design of the engine itself.

  On the other hand, there is an engine in which an air intake device is disposed on the engine compartment side, and in that case, it can be expected that the air intake device can replace the sound insulation wall (see, for example, Patent Document 1).

JP 2003-161155 A

  In the thing of the said patent document 1, the intake manifold is arrange | positioned to the side of an engine, and the air cleaner is arrange | positioned above the intake manifold, and noise insulation is anticipated by them. However, in the thing of patent document 1, the air cleaner of the width | variety which covers the upper direction of the several branch pipe divided into two with the throttle in between and arranged in the cylinder row direction is arrange | positioned. Therefore, there is a problem that the upper surface of the air cleaner is a wide surface, and sound is emitted from the wide surface.

In order to solve such a problem and improve the soundproofing property to the engine compartment side without using a soundproofing material or the like, in the present invention, it is connected to the upstream side of the air cleaner (8). The first intake pipe (4), the second intake pipe (11) connecting the downstream side of the air cleaner (8) and the throttle (12), and the intake chamber connected to the downstream side of the throttle (12) (13) is connected to the downstream side of the intake chamber (13) and each cylinder (CL) of the engine (1), and is connected to the first branch pipe (11) by the second intake pipe (11) in the cylinder row direction. 6a) and a second branch pipe (6b), a plurality of branch pipes (6) arranged with the second intake pipe (11) in between, the first intake pipe (4) or the A resonator (9a) connected to the second intake pipe (11) The air cleaner (8), the second being placed above the one side and the first branch pipe of the intake pipe (11) (6a), said resonator (9a), the second intake pipe (11 other side and the) was assumed to be placed above the second branch pipe (6b). According to this, since the air cleaner and the resonator are arranged above the plurality of branch pipes, it is possible to reduce the radiated sound radiated above the branch pipes.

In particular, prior Symbol plurality of branch pipes (6) may when being arranged on the cabin side of the engine (1), according to this, the rear intake branch pipes are arranged on the cabin side of the engine In the case of an engine, it is possible to suppress the radiated sound from the cylinder block and the operating sound of the engine valve from being transmitted to the passenger compartment side. The engine (1) is arranged horizontally extending in the width direction of the vehicle, and the first intake pipe (4) is arranged at one end side in the cylinder row direction of the engine (1) in the longitudinal direction of the vehicle. And an upstream resonator (9c) that communicates with the upstream tube portion (4a) and is disposed below the upstream tube portion (4a) separately from the resonator (9a). 9d) may be further included. According to this, a plurality of resonators can be arranged in a compact manner, and space saving and a high NV reduction effect can be obtained. Further, the air cleaner (8) and the resonator (9a) are preferably disposed on the same base material (5a, 5b). According to this, the air cleaner and the resonator are made of the same base material. Since they are integrated, the rigidity of the base material is increased and the effect of reducing radiated sound is increased.

  Also, each fuel injection valve (14) is disposed downstream of each of the plurality of branch pipes (6), and a fuel pipe (15) for supplying fuel to each fuel injection valve (14) has the plurality of branches. The air cleaner (8) and the resonator (9a) may be disposed so as to cover the fuel pipe (15) from above, extending in the cylinder row direction above the pipe (6). According to this, the radiated sound from the fuel pipe can also be reduced. Furthermore, the air cleaner (8) and the resonator (9a) are preferably arranged so as to cover the compartment (2) side of the fuel pipe (15). Radiation sound toward the room side can be reduced.

The first intake pipe (4) includes a pipe downstream part (4b) located above the second branch pipe (11), and the resonator (9a) is located above the pipe downstream part (4b). According to this configuration, the downstream portion of the first intake pipe and the resonator are arranged in a stacked state above the second branch pipe, thereby suppressing the sound radiated from the second branch pipe. The effect can be further increased. Further, the resonator (9a) is preferably arranged so as to cover the passenger compartment side of the pipe downstream portion (4b). According to this, the sound emitted from the pipe downstream portion toward the passenger compartment side is further increased. Can be suppressed. In addition, the separately from the resonator (9a), may further have a second intake pipe (11) and communicating vital the air cleaner (8) sub-resonator arranged on the cabin side of (9f), according to this For example, the radiated sound from the first branch pipe toward the passenger compartment can be further suppressed by the laminated structure of the air cleaner and the sub-resonator.

In addition to the resonator (9a), it is preferable to further include a sub-resonator (9f) that communicates with the second intake pipe (11) and is disposed on the cabin side of the resonator (9a) . According to this, a resonator can be made into a laminated structure, and the sound suppression effect by a resonator can be enlarged further.

  As described above, according to the present invention, it is possible to suppress the radiated sound from the intake branch pipe by appropriately arranging the air cleaner and the resonator used in the intake system structure without using a separate sound insulating material or the like. . Furthermore, it is possible to suppress noise emitted from fuel pipes and engine valves.

It is a top view which shows the principal part of the engine of the motor vehicle to which this invention was applied. It is the principal part front view seen from the one end side of the cylinder row direction of an engine. (A) is the whole air case figure seen from the arrow III line of FIG. 1, (b) is the top view seen from the arrow IIIb line of (a). FIG. 6 is a schematic intake path diagram showing the flow of intake air. It is a top view which shows an intake branch pipe. (A) is a top view of the principal part of the engine which shows 2nd Embodiment, (b) is the figure seen from the arrow VIb line | wire of (a). (A) is the top view seen by removing the cover of the air case in 2nd Embodiment, (b) is the sectional side view of the whole air case seen from the arrow VIIb line of (a).

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a plan view showing a main part of an automobile engine to which the present invention is applied. In the figure, the upper side is the vehicle front side, and the lower side is the vehicle compartment side (vehicle rear side).

  In FIG. 1, an engine 1 is provided in a horizontal orientation in which a crankshaft is orthogonal to a longitudinal direction of a vehicle in an engine room 3 provided on a vehicle front side of a passenger compartment 2. A first intake pipe 4 extends along the front-rear direction of the vehicle on one end side (right side in FIG. 1) of the engine 1 in the crankshaft direction, that is, in the cylinder (CL) row direction.

  As shown in FIG. 2, the first intake pipe 4 has an upper edge portion located substantially at the same height as the upper surface of the head cover 1 a of the engine 1 and also extends along the end surface in the cylinder row direction of the engine 1. It is provided and assembled to the engine 1 via a bracket (not shown). Each component of the intake system described below may be assembled to the outer surface of the engine 1 with a bolt or the like via a bracket, and the description of the assembly is omitted.

  An air case 5 to which the downstream end of the first intake pipe 4 is coupled is disposed on the vehicle interior side of the engine 1. The air case 5 is formed, for example, by injection molding a synthetic resin material, and is disposed above a plurality of branch pipes 6 communicating with each intake port (not shown) of the engine 1 as shown in FIG. And covers almost the entire area of the plurality of intake branch pipes 6 in plan view (see FIG. 1). The air case 5 includes a lower case 5a as a lower portion, a middle case 5b as an intermediate portion, and an air cleaner cover 5c and a resonator cover 5d as upper portions.

  Here, with reference to the schematic intake path diagram shown in FIG. 4, the flow of intake air and the relative positional relationship of each component of the intake system will be described. A pipe downstream portion 4b of the first intake pipe 4 is formed by the lower case 5a and the middle case 5b as base materials. A part of the upstream side of the pipe downstream portion 4b communicates with the first resonator 9a formed by the resonator cover 5d.

  An air cleaner 8 is accommodated in a portion of the middle case 5b which is a downstream end of the pipe downstream portion 4b, and intake air flowing into the pipe downstream portion 4b flows into the air cleaner cover 5c via the air cleaner 8. ing. A cleaner downstream side chamber 9b including an intake passage on the downstream side of the air cleaner 8 is formed by the air cleaner cover 5c.

  A second intake pipe 11 is connected to an intake outlet of a cleaner downstream side chamber 9 b that is downstream of the air cleaner 8. The cleaner downstream chamber 9b is formed higher than the head cover 1a in the height direction of the engine 1, and the second intake pipe 11 is bent downward and extended from a connection portion with the cleaner downstream chamber 9b.

  A throttle 12 is provided on the downstream side of the portion extending below the second intake pipe 11, and the downstream end of the second intake pipe 11 is connected to the intake chamber 13. The intake chamber 13 is formed in a flat horizontally long box shape extending in the cylinder row direction of the engine 1, and is arranged at a position on the side of the cylinder block of the engine 1. The downstream end of the second intake pipe 11 (the downstream side of the throttle 12) is connected to the central portion of the intake chamber 13, and four branch pipes 6 extend from the intake chamber 13 as a plurality of branch pipes in the illustrated example. ing. Each branch pipe 6 is bent so as to be away from the intake chamber 13 with respect to the engine 1 and curved upward to reach each intake port of the engine 1.

  Further, the plurality of branch pipes 6 are divided by half in the cylinder row direction of the engine 1 with the second intake pipe 11 in between, and on the one side of the second intake pipe 11 there are two second pipes in the illustrated example. One branch pipe 6a is arranged, and on the other side of the second intake pipe 11, two second branch pipes 6b are arranged in the illustrated example. As described above, the air cleaner 8 is arranged above the first branch pipe 6a so as to cover the entire first branch pipe 6a in plan view, and the first resonator 9a is seen in plan view above the second branch pipe 6b. The second branch pipe 6b is disposed so as to cover the whole.

  Thus, the upward sound emitted from the first branch pipe 6a can be blocked by the air cleaner 8, and the upward sound emitted from the second branch pipe 6b can be blocked by the first resonator 9a. Radiated sound can be reduced. Therefore, for example, the soundproofing material provided in the bulkhead between the vehicle compartment 2 and the engine compartment 3 can be reduced, and the high cost for noise reduction can be suppressed, and weight reduction as an automobile can be achieved.

  Further, as described above, the branch pipe 6 and the intake chamber 13 are disposed on the side of the passenger compartment 2 with respect to the engine 1, and are each formed in a shape that is close to the length in the cylinder row direction of the engine 1. . Thereby, since the radiated sound from the surface of the engine 1 on the side of the compartment 2 is blocked, the magnitude of the radiated sound from the cylinder block of the engine 1 and the operating sound of the engine valve transmitted to the compartment side is reduced.

  Further, as described above, the engine 1 is placed horizontally with the cylinder row direction directed in the vehicle width direction, and the pipe upstream portion 4a of the first intake pipe 4 is disposed in the longitudinal direction of the vehicle at one end side of the engine 1 in the cylinder row direction. It is arranged to extend. Downstream of the pipe upstream portion 4a, upstream resonators 9c and 9d communicating with each arbitrary position of the pipe upstream portion 4a are arranged (see FIG. 2). In the illustrated example, two upstream resonators 9c and 9d are used, but any one of them may be used. As a result, the plurality of resonators 9a, 9c, and 9d can be arranged in a compact manner, and the first intake pipe 4 is used for intake from the front of the vehicle in the engine 1 that includes the intake port on the passenger compartment side as described above. When arranged, the upstream resonators 9c and 9d can be arranged by suitably utilizing the empty space below the space, and space saving and a high NV (vibration noise) reduction effect can be obtained.

  Further, the joint portion of the lower case 5a and the middle case 5b described above is vibration welded after, for example, injection molding. Thereby, the lower case 5a and the middle case 5b as the base material of the air case 5 having a length extending over almost the entire length in the cylinder row direction of the engine 1 are formed as a single body having high rigidity. On top of this, an air cleaner cover 5c and a resonator cover 5d are provided. Therefore, even if the air cleaner cover 5c and the resonator cover 5d are separated as in the illustrated example, high rigidity of the air case 5 as a whole is obtained, and the radiated sound reduction effect is increased. The air cleaner cover 5c is detachable so as to replace the air cleaner (element) 8. However, the resonator cover 5d may be vibration welded in the same manner as described above.

  2 and 5, a fuel injection valve 14 is provided in the vicinity of the intake port of each branch pipe 6, and a fuel pipe 15 for supplying fuel to each fuel injection valve 14 is provided. Is connected. The fuel pipe 15 extends in the cylinder row direction of the engine 1 above the plurality of branch pipes 6 by the fuel injection valve 14 being attached to the upper side of the branch pipes 6, and extends upward by the air case 5. Covered. Thereby, the radiation sound radiated | emitted upwards from the fuel piping 15 or the fuel injection valve 14 can also be reduced.

  Further, a portion corresponding to the air cleaner 8 (cleaner downstream side chamber 9b) of the air case 5 (lower case 5a and middle case 5b) and the first resonator 9a covers the fuel pipe 15 and the vehicle compartment 2 side of each fuel injection valve 14. Is provided. Thereby, it is possible to block the radiated sound from the fuel pipe 15 and the fuel injection valve 14 from being transmitted to the vehicle compartment 2 and to reduce the radiated sound from the fuel pipe 15 and the fuel injection valve 14 toward the vehicle compartment 2 side. In addition to the effect of suppressing the upward radiated sound, the radiated sound transmitted to the passenger compartment 2 can be further suppressed.

  Further, the pipe downstream portion 4b of the first intake pipe 4 is formed by using a part (5a, 5b) of the air case 5 in the illustrated example, and is located above the second branch pipe 6b. The first resonator 9a is positioned above the pipe downstream portion 4b, and the pipe downstream portion 4b and the first resonator 9a are disposed in a stacked state above the second branch pipe 6b. The effect of suppressing the radiated sound from the two-branch pipe 6b can be further increased.

  Further, due to a part (5a, 5b) of the air case 5 forming the pipe downstream portion 4b, the lower extension chamber 9e of the first resonator 9a is a pipe in a vehicle front-rear direction view of the air case 5 viewed from the rear side of the vehicle. It is formed so as to straddle the downstream portion 4b (in other words, cover it). The first resonator 9a and the lower extension chamber 9e communicate with each other to form one resonance space. And the lower extension chamber 9e located in the casing 2 side of the pipe downstream portion 4b covers the casing 2 side of the pipe downstream portion 4b, and thereby goes to the casing 2 side from the pipe downstream portion 4b. Radiated sound can be further suppressed. In the illustrated example, the first resonator 9 a is connected to the first intake pipe 4, but may be connected to the second intake pipe 11. Even in this case, the same layout as described above can be obtained, and the same effects can be obtained.

  A sub-resonator 9f that is integrally formed when the lower case 5a is formed is provided on the side of the air cleaner 8 that is closer to the vehicle compartment 2. The sub resonator 9 f communicates with the upstream side of the throttle 1 of the second intake pipe 11. The sub-resonator 9f thus provided has a laminated structure with the air cleaner 8 on the passenger compartment side with respect to the first branch pipe 6a, and further emits radiated sound from the first branch pipe 6a toward the passenger compartment 2 side. Can be suppressed.

  In the present embodiment, the first resonator 9a is set to have the largest volume among the plurality of resonators (9a, 9c to 9f), and the first resonator 9a extends from the intake opening end to the throttle 12. It is disposed at a substantially intermediate position of the intake passage length (that is, the distance from the upstream end of the first intake pipe 4 to the downstream end of the second intake pipe 11). In order to increase the silencing effect in the low frequency range, it is usually necessary to increase the volume of the resonator (9a). However, the first resonator 9a is disposed at a substantially intermediate position of the intake passage length from the intake opening end to the throttle 12. Thus, the silencing effect of the first resonator 9a is improved, and as a result, the volume of the first resonator 9a can be set small. Thereby, the whole intake system can be made compact and lightweight.

  Next, a second embodiment to which the present invention is applied will be described with reference to FIGS. In addition, about the part similar to the above, the same code | symbol is attached | subjected and the detailed description is abbreviate | omitted. As shown in FIG. 6A showing a plan view, in the horizontally mounted engine 1 as in the first embodiment, the first intake pipe 4 extends in the longitudinal direction of the vehicle on one end side in the cylinder row direction. An air case 15 corresponding to the air case 5 is arranged on the vehicle compartment side of the engine 1.

  As shown in FIG. 6 (b) showing a side view seen from the arrow VIb line in FIG. 6 (a), the air case 15 has a length in the cylinder row direction of the engine 1 above the plurality of branch pipes 6. A main body case 15a arranged to extend over almost the entire length, a resonator cover 15b arranged above the first branch pipe 6a above the main body case 15a, and above the main body case 15a. The air cleaner cover 15c is arranged above the second branch pipe 6b.

  Next, with respect to the inside of the air case 15, the resonator cover 15b and the air cleaner cover 15c are removed and the plan view showing the inside of the main body case 15a is seen from the line VIIb in FIG. 7 (a) and FIG. 7 (a). The air case 15 will be described with reference to a side sectional view. The main body case 15a is formed with a communication conduit 16 that communicates with the first intake pipe 4 and extends in the extending direction (cylinder row direction) of the main body case 15a.

  A first resonator 9a as an upstream side resonator formed by a part of the main body case 15a and the resonator cover 15b is formed on the opening side of the communication pipe 1 opposite to the connection side of the first intake pipe 4. . The air cleaner cover 15c described above is detachably attached to the upper side of the intermediate portion of the communication pipe line 16, and an opening formed in the main body case 15a to communicate the communication pipe line 16 and the inside of the air cleaner cover 15c. An air cleaner 8 is accommodated in the interior.

  A second intake pipe 11 is connected to the air cleaner cover 15c, and the layout of the parts is the same as that described above on the downstream side of the second intake pipe 11, and the main body case 15a has a main body on the compartment side of the first resonator 9a. A sub-resonator 9f is provided as a downstream-side resonator that is integrally molded when the case 15a is molded.

  This second embodiment is different from the first embodiment in terms of the left and right sides in the side view of the air cleaner 8 and the first resonator 9a. Even in such a case, the same effect as described above can be obtained. It is done. The sub-resonator 9f is formed in such a size that the first resonator 9a and the sub-resonator 9f have a laminated structure with respect to the compartment 2 side of the engine 1 as shown by a two-dot chain line in FIG. Therefore, the sound suppression effect is further enhanced by the resonators 9a and 9f having the laminated structure.

  In each of the above embodiments, a plurality of resonators are provided, and a resonator that covers the air cleaner 8 and the plurality of branch pipes 6 and the compartment 2 side is described as the first resonator 9a. For this reason, it is not intended to limit the order of connection to the intake pipe.

1 Engine 4 First intake pipe, 4a Pipe upstream part, 4b Pipe downstream part 5a Lower case (base material), 5b Middle case (base material)
6 Branch pipe, 6a First branch pipe, 6b Second branch pipe 8 Air cleaner 9a Resonator (Upstream side resonator)
9c / 9d Upper Resonator 9f Sub Resonator (Downstream Resonator)
11 Second intake pipe 12 Throttle 13 Intake chamber 14 Fuel injection valve 15 Fuel piping

Claims (10)

A first intake pipe connected to the upstream side of the air cleaner; a second intake pipe connecting the downstream side of the air cleaner and the throttle; an intake chamber connected to the downstream side of the throttle; and a downstream side of the intake chamber And a plurality of cylinders arranged between the engine and the cylinders of the engine so as to be divided into a first branch pipe and a second branch pipe by the second intake pipe in the cylinder row direction. A branch pipe, and a resonator connected to the first intake pipe or the second intake pipe,
The air cleaner is placed above the one side and the first branch pipe of the second intake pipe,
The resonator is an intake device for an internal combustion engine, characterized in that it is placed above the other side and the second branch pipe of the second intake pipe. An intake device for an internal combustion engine according to claim 1, before Symbol plurality of branch pipes, characterized in that it is arranged on the cabin side of the engine. The engine is disposed horizontally extending in the width direction of the vehicle,
The first intake pipe includes a pipe upstream portion extending in the front-rear direction of the vehicle on one end side in the cylinder row direction of the engine,
3. The intake device for an internal combustion engine according to claim 1, further comprising an upstream resonator communicating with the upstream portion of the pipe and disposed below the upstream portion of the pipe , separately from the resonator.   The intake device for an internal combustion engine according to any one of claims 1 to 3, wherein the air cleaner and the resonator are disposed on the same base material. Each fuel injection valve is disposed downstream of each of the plurality of branch pipes,
A fuel pipe for supplying fuel to each fuel injection valve extends in the cylinder row direction above the plurality of branch pipes;
The intake device for an internal combustion engine according to any one of claims 1 to 4, wherein the air cleaner and the resonator are disposed so as to cover the fuel pipe from above.   The intake device for an internal combustion engine according to claim 5, wherein the air cleaner and the resonator are arranged so as to cover a cabin side of the fuel pipe. The first intake pipe includes a pipe downstream portion located above the second branch pipe;
The intake device for an internal combustion engine according to any one of claims 1 to 6, wherein the resonator is disposed above the downstream portion of the pipe.   The intake device for an internal combustion engine according to claim 7, wherein the resonator is disposed so as to cover a passenger compartment side of the pipe downstream portion. Apart from the resonator, an intake device for an internal combustion engine according to claim 7 or claim 8, characterized in that it further comprises a sub-resonator arranged on the cabin side of the second intake pipe and communicating vital the air cleaner . 7. The internal combustion engine according to claim 1 , further comprising a sub-resonator that communicates with the second intake pipe and is disposed on a cabin side of the resonator separately from the resonator. Inhalation device.

Images