JP2012180760A - Intake resonator of internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an intake resonator of an internal combustion engine that regulates a resonance frequency of the intake resonator with a set of configurations without changing the intake resonator and an exterior of the intake resonator.SOLUTION: The intake resonator 1 of the internal combustion engine divides a communication pipe 11 from an intake duct 2 and connects a resonance box 10 to the communication pipe 11 to reduce intake noise generated in the intake duct 2 through the resonance effect. The intake resonator 1 is inserted through the inside of the communication pipe 11 and includes a regulating pipe 12 disposed along an axial direction thereof so as to be slidable. In addition, the length L of a connection passage 14 for connecting between the inside of the intake duct 2 and the inside of the resonance box 10 can be regulated according to a position of the regulating pipe 12 in the axial direction.

Description

  The present invention relates to an intake resonator for an internal combustion engine that reduces intake noise generated in an intake duct of the internal combustion engine by resonance.

  2. Description of the Related Art Conventionally, in an internal combustion engine, an intake resonator is provided upstream of an air cleaner in an intake duct, so that intake noise generated in the intake duct is reduced by a resonance action by the intake resonator. In this intake resonator, a communication pipe is branched and connected in the middle of the intake duct, and a resonance box is connected to the communication pipe. Further, the resonance frequency by the intake resonator is defined by the volume of the resonance box, the length of the communication pipe, and the cross-sectional area of the communication pipe.

  Since the frequency characteristics of the intake noise vary depending on the model of the internal combustion engine, it is necessary to appropriately set the resonance frequency by the intake resonator, that is, the volume of the resonance box, the length of the communication pipe, and the cross-sectional area of the communication pipe for each model.

Conventionally, as such an intake resonator, for example, there are a technique described in Patent Document 1 and a technique described in Patent Document 2.
As shown in FIG. 8, in the technique described in Patent Document 1, an inner tube 212 is inserted into a first communication tube 211 connected to the resonance box 210. Further, the tip of the first communication pipe 211 and the tip of the second communication pipe 221 connected to the intake duct 202 are connected by a connection pipe 230 that covers these tips. A plurality of types of inner pipes 212 having different lengths X are prepared, and by selecting the inner pipe 212 having a length that satisfies the required resonance frequency, intake noise is reduced by the resonance action.

  As shown in FIG. 9, in the technique described in Patent Document 2, a protrusion 312 is formed on the outer peripheral surface of the first communication pipe 311 connected to the resonance box 310. The second communication pipe 321 connected to the intake duct 302 is formed with recesses 322 and 323 along the axial direction from the tip. The recesses 322 and 323 have different lengths. When the protrusion 312 is inserted into the longer recess 322 among these, the distance between the intake duct 302 and the resonance box 310 becomes the first predetermined value Y1 (see FIG. 9A). When the protrusion 312 is inserted into the shorter concave portion 323, the distance between the intake duct 302 and the resonance box 310 becomes a second predetermined value Y2 that is larger than the first predetermined value Y1 (FIG. 9B). )reference). In this way, the resonance frequency by the intake resonator can be changed.

Japanese Utility Model Publication No. 4-54959 JP 2008-133797 A

  However, in the technique described in Patent Document 1, in order to cope with intake noise for each model of the internal combustion engine, a plurality of types of inner pipes having different lengths must be prepared. That is, with one set of configurations, the resonance frequency by the intake resonator cannot be adjusted.

  In the technique described in Patent Document 2, the resonance frequency can be adjusted only by the number of the concave portions formed in the second communication pipe. For this reason, the resonance frequency by the intake resonator cannot be continuously changed, and it is not possible to appropriately deal with the specification of the frequency of intake noise that is slightly different for each model of the internal combustion engine.

  The present invention has been made in view of such circumstances, and an object thereof is an internal combustion engine capable of adjusting the resonance frequency of the intake resonator by a single configuration without changing the outer shape of the intake duct and the intake resonator. It is to provide an intake resonator.

Hereinafter, means for solving the above-described problems and the effects thereof will be described.
According to the first aspect of the present invention, an intake resonator for an internal combustion engine that branches a communication pipe from an intake duct of the internal combustion engine and connects a resonance box to the communication pipe to reduce intake noise generated in the intake duct by a resonance action. And an adjustment pipe that is inserted into the communication pipe and is slidable along the axial direction of the communication pipe, and the inside of the intake duct and the resonance box according to the position of the adjustment pipe in the axial direction. The gist is that the length of the connection passage connecting the inside is adjustable.

  According to this configuration, by changing the position of the adjustment pipe in the axial direction of the communication pipe, the length of the connection passage that connects the inside of the intake duct and the inside of the resonance box according to the position of the adjustment pipe is continuous. Can be adjusted. For this reason, the resonance frequency by the intake resonator can be adjusted by one type of adjusting tube. Therefore, the resonance frequency by the intake resonator can be adjusted by a set of configurations without changing the outer shapes of the intake duct and the intake resonator.

The gist of the invention according to claim 2 is that, in the intake resonator of the internal combustion engine according to claim 1, the adjusting pipe is provided so as to protrude inside the resonance box.
For example, in a configuration in which the adjustment pipe cannot protrude into the resonance box and can only protrude into the intake duct, a contradiction such as increasing the flow resistance inside the intake duct occurs depending on the position of the adjustment pipe. In this regard, according to the above-described configuration, the adjustment tube can be protruded into the resonance box, so that the resonance frequency by the intake resonator can be adjusted without increasing the flow resistance of the air flowing through the intake duct. .

  According to a third aspect of the present invention, in the intake resonator of the internal combustion engine according to the first or second aspect, an elongated hole is formed in the communication pipe along an axial direction thereof, and the communication pipe is provided with the communication pipe. A protrusion inserted into the long hole of the pipe is formed, and the long hole of the communication pipe is provided with a seal member for fixing the protrusion to the communication pipe and sealing the hole. That is the gist.

  According to this configuration, it is possible to easily change the position of the adjustment pipe in the axial direction of the communication pipe by changing the position of the adjustment pipe in a state where the protrusion of the adjustment pipe is inserted into the long hole of the communication pipe. it can. In addition, since the hole of the communication pipe is sealed by the seal member, it is possible to avoid leakage of air from the hole of the communication pipe to the outside. Further, the position of the adjustment pipe relative to the communication pipe can be fixed by the seal member.

  According to a fourth aspect of the present invention, in the intake resonator of the internal combustion engine according to any one of the first to third aspects, a connection portion to which one end of the communication pipe can be attached and detached is branched at the intake duct. The gist of the present invention is that a sealing member is provided for sealing between the one end of the communication pipe and the connecting portion.

  According to this configuration, since the gap between the connection portion of the intake duct and the communication pipe is sealed by the seal member, it is possible to prevent air from leaking from the gap to the outside.

1 is a schematic diagram illustrating an overall configuration of an intake resonator of an internal combustion engine according to an embodiment of the present invention. Sectional drawing of the intake resonator of the embodiment. (A) Perspective view of connecting pipe, (b) Perspective view of adjusting pipe. The schematic diagram of the intake resonator of the embodiment. The graph which shows the relationship between the length of the connection path of an intake resonator, and the resonance frequency by an intake resonator for every internal diameter of a connection path. Sectional drawing of the modification of the intake resonator of the internal combustion engine which concerns on this invention. (A), (b) The perspective view of the seal member in the other modification of the intake resonator of the internal combustion engine which concerns on this invention. Sectional drawing which shows the cross-section of the intake resonator of patent document 1. FIG. (A), (b) Sectional drawing which shows the cross-section of the intake resonator of patent document 2. As shown in FIG.

Hereinafter, with reference to FIGS. 1 to 5, an embodiment in which an intake resonator of an internal combustion engine according to the present invention is embodied will be described in detail.
As shown in FIG. 1, an intake resonator 1 is provided on the upstream side of the air cleaner 3 in the intake duct 2 of the internal combustion engine. In the intake resonator 1, a communication pipe 11 is branched and connected in the middle of the intake duct 2, and a resonance box 10 is connected to the communication pipe 11.

  As shown in FIG. 2, a cylindrical connecting portion 21 is formed in the intake duct 2. The resonance box 10 has a communication pipe 11 protruding outward. The distal end of the communication tube 11 is inserted into the connecting portion 21, and an annular first seal member 22 for sealing the gap is formed in the gap between the outer peripheral surface of the distal end and the inner peripheral surface of the connecting portion 21. It is installed. The first seal member 22 is made of urethane rubber.

An adjustment tube 12 is inserted into the communication tube 11. The outer diameter of the adjustment pipe 12 is slightly smaller than the inner diameter of the communication pipe 11.
As shown in FIG. 3A, the communication tube 11 is formed with a slit hole 11a extending from the end on the tip side toward the resonance box 10 along the axial direction.

As shown in FIG. 3 (b), a pin 12a projects from the outer peripheral surface of the adjustment tube 12 toward the radially outer side.
As shown in FIG. 2, the pin 12 a of the adjustment tube 12 is inserted into the slit hole 11 a of the communication tube 11. As a result, the adjustment pipe 12 can slide along the axial direction of the communication pipe 11 and can protrude into the resonance box 10.

  A second seal member 13 made of a nonwoven fabric such as felt is provided in the slit hole 11a of the communication tube 11. Specifically, the second seal member 13 is pushed into the slit hole 11a above and below the pin 12a. The second seal member 13 fixes the pin 12a to the communication tube 11 and seals the slit hole 11a.

  In the intake resonator 1 having such a configuration, the length L of the connection passage 14 that connects the inside of the intake duct 2 and the inside of the resonance box 10 can be adjusted according to the position of the adjustment pipe 12 in the axial direction.

  As shown in FIGS. 4 and 5, the resonance frequency F by the intake resonator 1 is such that the inner diameter a of the connection passage 14 is smaller as the length L of the connection passage 14 is longer if the volume V of the resonance box 10 is constant. It gets smaller.

The pin 12a of the adjustment pipe 12 corresponds to a protrusion according to the present invention, and the slit hole 11a of the communication pipe 11 corresponds to a long hole according to the present invention.
According to the intake resonator of the internal combustion engine according to the present embodiment described above, the following effects can be obtained.

  (1) The intake resonator 1 of the internal combustion engine includes an adjustment pipe 12 that is inserted into the communication pipe 11 and is slidable along the axial direction thereof. Further, the length L of the connection passage 14 that connects the inside of the intake duct 2 and the inside of the resonance box 10 can be adjusted according to the position of the adjustment pipe 12 in the axial direction. According to such a configuration, the resonance frequency by the intake resonator 1 can be adjusted by the adjustment pipe 12 having one type of shape. That is, the length L of the connection passage 14 can be adjusted without changing the actual distance M between the intake duct 2 and the resonance box 10 as shown in FIG. Therefore, the resonance frequency by the intake resonator 1 can be adjusted by a set of configurations without changing the outer shapes of the intake duct 2 and the intake resonator 1.

  (2) The adjustment tube 12 is provided in the resonance box 10 so as to protrude. For example, in a configuration in which the adjustment pipe cannot protrude into the resonance box and can only protrude into the intake duct, a contradiction such as increasing the flow resistance inside the intake duct occurs depending on the position of the adjustment pipe. In this regard, according to the present embodiment, the adjustment tube 12 can be protruded into the resonance box 10, and therefore the resonance frequency by the intake resonator 1 can be increased without increasing the flow resistance of the air flowing through the intake duct 2. Can be adjusted.

  (3) The communication tube 11 is formed with a slit hole 11a along the axial direction thereof. Further, a pin 12 a that is inserted into the slit hole 11 a of the communication pipe 11 is formed in the adjustment pipe 12. In addition, the slit hole 11 a of the communication pipe 11 is provided with a second seal member 13 for fixing the pin 12 a to the communication pipe 11 and closing the slit hole 11 a. According to such a configuration, the position of the adjustment pipe 12 in the axial direction of the communication pipe 11 can be easily changed by changing the position of the pin 12a while the pin 12a of the adjustment pipe 12 is inserted into the slit hole 11a of the communication pipe 11. Can be changed. Moreover, since the slit hole 11a of the communicating tube 11 is sealed by the second seal member 13, it is possible to avoid air from leaking outside from the slit hole 11a. Further, the position of the adjustment pipe 12 with respect to the communication pipe 11 can be fixed by the second seal member 13.

  (4) The intake duct 2 is formed with a branching portion 21 to which one end of the communication pipe 11 can be attached and detached. Further, a first seal member 22 that seals a gap between one end of the communication tube 11 and the connection portion 21 is provided. According to such a configuration, since the gap between the connection portion 21 of the intake duct 2 and the communication pipe 11 is sealed by the first seal member 22, it is possible to avoid air from leaking to the outside through the gap. .

  In addition, the intake resonator of the internal combustion engine according to the present invention is not limited to the configuration exemplified in the above-described embodiment, and can be implemented, for example, as follows by appropriately changing the configuration.

  In the above embodiment, the adjustment pipe 12 has a small thickness and there is little difference between the inner diameter of the communication pipe 11 and the inner diameter of the adjustment pipe 12. However, instead of this, as shown in FIG. The thickness of the tube 112 is large, and the difference can be changed between the inner diameter of the communication tube 11 and the inner diameter of the adjustment tube 112.

In the above embodiment, the second seal member 13 is made of felt (nonwoven fabric). However, instead of this, the seal member may be made of another material such as a rubber material.
In the above embodiment, the second seal member 13 is pushed into the slit hole 11a above and below the pin 12a. However, the configuration of the seal member is not limited to the split type as described above, and an integrated seal member can also be adopted. That is, as shown in FIG. 7A, the long seal member 413 is formed of an elastic member, and the seal member 413 has a first cut along its longitudinal direction (vertical direction in FIG. 7). 413a is formed. Further, in the middle of the first cut 413a, a second cut 413b is formed in a direction (left-right direction in FIG. 7) orthogonal to the longitudinal direction. If such a seal member 413 is used, the position of the adjustment pipe 12 in the axial direction of the communication pipe 11 can be changed by moving the pin 12a along the first notch 413a. Further, if the pin 12a is moved from the first cut 413a to the second cut 413b, a gap is suppressed from being generated between the pin 12a and the second cut 413b by the elastic force of the seal member 413. Further, the pin 12 a can be fixed to the seal member 413, that is, to the communication pipe 11. Further, as shown in FIG. 7B, a plurality of such second cuts 513 b may be formed in the longitudinal direction of the seal member 513. Incidentally, a resin material or a rubber material is desirable as the elastic member.

  In the above embodiment, the adjustment tube 12 can be slid along the axial direction by the slit hole 11a of the communication tube 11 and the pin 12a of the adjustment tube 12, but the present invention is not limited to this. In addition, for example, the slit hole (hole) of the communication pipe and the pin (projection) of the adjustment pipe are omitted, the adjustment pipe is inserted into the connection pipe, and the position in the axial direction is determined by sliding the adjustment pipe Thus, for example, the adjusting tube may be fixed to the connecting tube by bonding or the like.

  -The intake duct and the communication pipe may be integrally formed. In this case, one end of the communication pipe may be detachably provided on the resonance box. Further, a sealing member for sealing the gap between the one end of the communication pipe and the resonance box may be provided.

  DESCRIPTION OF SYMBOLS 1 ... Intake resonator, 10 ... Resonance box, 11 ... Communication pipe, 11a ... Slit hole, 112, 112 ... Control pipe, 12a, 112a ... Pin, 13 ... Second seal member, 14 ... Connection passage, 2 ... Intake duct, DESCRIPTION OF SYMBOLS 21 ... Connection part, 22 ... 1st sealing member, 3 ... Air cleaner, 210, 310 ... Resonance box, 211, 311 ... 1st communicating pipe, 202, 302 ... Intake duct, 221, 321 ... 2nd communicating pipe, 212 ... Inner pipe, 230 ... connecting pipe, 312 ... projection, 322, 323 ... recess, 413, 513 ... seal member, 413a, 513a ... first cut, 413b, 513b ... second cut.

Claims (4)

In the intake resonator of the internal combustion engine for branching the communication pipe from the intake duct of the internal combustion engine and connecting a resonance box to the communication pipe to reduce intake noise generated in the intake duct by resonance action,
An adjustment pipe that is inserted into the communication pipe and is slidable along the axial direction; and depending on the position of the adjustment pipe in the axial direction, the inside of the intake duct, the inside of the resonance box, An intake resonator for an internal combustion engine, characterized in that the length of the connection passage connecting the two is adjustable. The intake resonator of the internal combustion engine according to claim 1,
An intake resonator for an internal combustion engine, wherein the adjustment pipe is provided so as to protrude inside the resonance box. The intake resonator of the internal combustion engine according to claim 1 or 2,
The communication pipe is formed with a long hole along its axial direction,
The adjustment pipe is formed with a protrusion inserted into the long hole of the communication pipe,
An intake resonator for an internal combustion engine, wherein the elongated hole of the communication pipe is provided with a seal member for fixing the protrusion to the communication pipe and sealing the hole. In the intake resonator of the internal combustion engine according to any one of claims 1 to 3,
A connecting portion in which one end of the communication pipe can be attached and detached is branched in the intake duct,
An intake resonator for an internal combustion engine, comprising: a seal member that seals between one end of the communication pipe and the connection portion.

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