JP2018105217A - Air cleaner of internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrain disturbance of an air flow.SOLUTION: An air cleaner of an internal combustion engine comprises a case 20 having a case body 21, and an inlet duct 26 integrated with the case body 21. The case 20 has: a first case molding 30 having an opening side peripheral wall part 31 surrounding an opening 22 of the case body 21 and a first half-cylinder-shaped inlet duct half-split part 32 extending in communication with the opening side peripheral wall part 31; and a second case molding 35 having a bottom wall 24 of the case body 21, a bottom wall side peripheral wall part 36 communicated with the bottom wall 24, and a second half-cylinder-shaped inlet duct half-split part 37 extending in communication with the bottom wall side peripheral wall part 36. By jointing a peripheral edge of the opening side peripheral wall part 31 and a peripheral edge of the bottom wall side peripheral wall part 36, the case body 21 is formed. By jointing a peripheral edge of the first inlet duct half-split part 32 and a peripheral edge of the second inlet duct half-split part 37, the inlet duct 26 is formed.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an air cleaner for an internal combustion engine.

An air cleaner for filtering intake air is provided in an intake passage of the internal combustion engine.
Some conventional air cleaners include a case having an inlet, a cap having an outlet, and a filter element provided between an opening of the case and an opening of the cap facing the opening. An inlet duct separate from the case is connected to the case inlet.

  In addition, the air cleaner described in Patent Document 1 includes a cap in which an inlet duct is integrally formed, and the opening on the downstream side of the inlet duct and the opening of the inlet of the case are assembled by assembling the cap with the case. The department communicates.

JP 2005-344555 A

  By the way, in the conventional general air cleaner, since a separate inlet duct is connected to the inlet of the case, a step is likely to occur on the inner peripheral surface of the connecting portion. For this reason, the air flow is disturbed by this step, which contributes to an increase in pressure loss.

  Further, in the air cleaner described in Patent Document 1, a step is easily formed on the inner peripheral surface of the connection portion between the opening on the downstream side of the inlet duct formed integrally with the cap and the opening of the inlet of the case. The flow will be disturbed. Furthermore, in the air cleaner described in Patent Document 1, since the inlet duct is formed integrally with the cap, when replacing the filter element, the inlet duct must be lifted and opened together with the cap. There is a problem that the work becomes complicated.

  The objective of this invention is providing the air cleaner of the internal combustion engine which can suppress disorder of the air flow.

  An air cleaner for an internal combustion engine that achieves the above-described object faces a case body having a case body, a case having an inlet duct formed integrally with the case body, a cap having an outlet, and the opening of the case body. And a filter element provided between the opening of the cap. The case includes a first case molded body having an opening-side peripheral wall that surrounds the opening of the case main body, and a half-cylindrical first inlet duct half-split extending continuously from the opening-side peripheral wall. A second wall having a bottom wall of the case main body, a bottom wall side peripheral wall portion continuous with the bottom wall, and a half cylindrical second inlet duct half portion extending continuously with the bottom wall side peripheral wall portion. The case body is formed by joining a peripheral edge of the opening-side peripheral wall part and a peripheral edge of the bottom wall-side peripheral wall part, and the first inlet duct half-split The inlet duct is formed by joining the peripheral edge of the part and the peripheral edge of the second inlet duct half part.

  According to this configuration, since the inlet duct is formed integrally with the case body, unlike the conventional configuration in which a separate inlet duct is connected to the inlet of the case, the inner peripheral surface of the intake passage No steps due to connection occur. Therefore, it is possible to suppress the disturbance of the air flow through the intake passage.

Further, since the inlet duct is integral with the case body, only the cap can be lifted and opened. For this reason, the exchange workability | operativity of a filter element is not impaired.
However, when the inlet duct is integral with the case body, it is difficult to mold the case when the shape of the inlet duct is complicated and it is difficult to remove the die.

  In this regard, according to the above configuration, the first case molded body having the opening side peripheral wall portion and the first inlet duct half portion, the bottom wall, the bottom wall side peripheral wall portion, and the second inlet duct half portion The case is formed by joining the second case molded body having For this reason, each case molded object can be shape | molded easily and a case can be formed easily.

  According to the present invention, air flow disturbance can be suppressed.

The perspective view which shows the whole air cleaner about one Embodiment of the air cleaner of an internal combustion engine. The disassembled perspective view which shows each component which comprises the air cleaner in the embodiment spaced apart from each other. Sectional drawing which shows the cross-sectional structure along line 3-3 in FIG. The perspective view which shows the case in the embodiment from the front side. The perspective view which shows the cap in the same embodiment from the front side. The perspective view which shows the 1st case molded object in the embodiment from the back side. The perspective view which shows the 2nd case molded object in the embodiment from the front side. The perspective view which shows the 1st cap molded object in the embodiment from the front side. The perspective view which shows the 1st cap molded object in the embodiment from the back side. The perspective view which shows the 2nd cap molded object in the same embodiment from the front side. The perspective view which shows the 2nd cap molded object in the embodiment from the back side. FIG. 4 is an exploded perspective view showing parts constituting the air cleaner in the same embodiment separated from each other, and is an exploded perspective view showing an enlarged portion corresponding to a case passage and a cap passage in a return passage of blow-by gas. It is a top view of the air cleaner in the embodiment, Comprising: The top view which expands and shows the part corresponding to a case channel | path and a cap channel | path. FIG. 14 is a cross-sectional view showing a cross-sectional structure along the line 14-14 in FIG. 13; FIG. 15 is a cross-sectional view showing a cross-sectional structure along the line 15-15 in FIG. 13;

  Hereinafter, an embodiment in which the present invention is embodied as an air cleaner (hereinafter referred to as an air cleaner 10) of an in-vehicle internal combustion engine mounted in an engine room of an automobile will be described with reference to FIGS.

  In the following description, the front side and the rear side of the vehicle in the front-rear direction are simply referred to as the front side and the rear side, respectively. Further, the right side and the left side when viewing the front from the rear of the vehicle are simply referred to as the right side and the left side.

  As shown in FIGS. 1 to 3, the air cleaner 10 has the same structure as a case 20 in which an inlet duct 26 is integrally formed, a cap 50 having an outlet 56, and a rectangular opening 22 formed in the upper part of the case 20. The filter element 80 is provided between the rectangular opening 52 formed in the lower part of the cap 50 facing the opening 22.

<Case 20>
As shown in FIGS. 3 and 4, the case 20 includes a flat case body 21 having a peripheral wall 23 and a bottom wall 24 surrounding the opening 22, an inlet duct 26 connected to the peripheral wall 23, and an inlet duct 26. And a resonator 48 connected on the way.

As shown in FIG. 3, a flange 25 is formed on the entire periphery of the periphery of the opening 22.
As shown in FIG. 4, a case passage 40 that forms a part of a recirculation passage for recirculating blow-by gas of the internal combustion engine to the intake passage is formed at the left edge of the peripheral wall 23.

  In a portion corresponding to the corner portion of the case main body 21, there are formed four to-be-latched portions 49 on which clamps 95 (see FIGS. 1 and 2) for fastening the case 20 and the cap 50 are latched. ing.

  As shown in FIGS. 3 and 4, the inlet duct 26 is connected to the front surface of the peripheral wall 23 of the case main body 21 and extends along the circumferential direction, and swells from the connection portion 261 toward the front side. It has a bulged portion 262 that is brought out. The connecting portion 261 is formed over the entire width of the front surface of the peripheral wall 23.

  The inlet duct 26 includes a first extending portion 27 extending from the bulging portion 262 toward the left side in the vehicle width direction, and a folded portion folded back from the first extending portion 27 toward the front side. 29 and a second extending portion 28 extending from the folded portion 29 toward the right side in the vehicle width direction.

In the inlet duct 26 of the present embodiment, the air flow path cross-sectional area is gradually increased from the first extending portion 27 toward the connecting portion 261.
The resonator 48 is connected to the front surface of the bulging portion 262 of the inlet duct 26, extends toward the right side, and protrudes toward the rear side, and is located on the right side of the case body 21. Yes.

As shown in FIGS. 4 and 12, the case passage 40 is formed from the rear edge of the first extending portion 27 of the inlet duct 26 to the left edge of the peripheral wall 23 of the case body 21.
As shown in FIG. 12, the case passage 40 is bent at the upper end of the upstream vertical hole 41 extending in the vertical direction, the upper end of the upstream vertical hole 41, and the rear edge of the first extending portion 27 and It has a horizontal hole portion 43 extending along the left edge of the peripheral wall 23, and a downstream vertical hole portion 44 that is bent at the downstream end of the horizontal hole portion 43, that is, the rear end portion and extends upward. ing.

  As shown in FIGS. 4, 12, and 14, the upstream end 42 of the upstream vertical hole 41 has a cylindrical shape and protrudes downward. A straight tubular hose (not shown) is externally fitted to the upstream end 42 and the hose is connected to a cylinder head cover (not shown) located immediately below.

  As shown in FIGS. 4, 12, and 15, the downstream end 45 of the downstream vertical hole 44 has a cylindrical shape and protrudes upward. A straight tubular hose 90 is fitted on the downstream end 45. Further, the hose 90 is fixed to the downstream end 45 by a clip 91.

As shown in FIGS. 2 to 4, the case 20 is divided into a first case molded body 30 and a second case molded body 35 provided on the lower side of the first case molded body 30. Has been.
As shown in FIGS. 2, 4, and 6, the first case molded body 30 includes an opening-side peripheral wall portion 31 that surrounds the opening 22, and a first half-tubular shape that extends continuously from the opening-side peripheral wall portion 31. The inlet duct half part 32, and the first resonator half part 34 in the form of a half cylinder extending continuously from the first inlet duct half part 32. A first case passage forming portion 33 is formed at the left edge of the opening-side peripheral wall portion 31. The first case molded body 30 is integrally formed of a hard resin material.

  As shown in FIGS. 2, 4, and 7, the second case molded body 35 extends to the bottom wall 24, the bottom wall side peripheral wall portion 36 that continues to the bottom wall 24, and the bottom wall side peripheral wall portion 36. A second cylindrical half inlet part 37 having a half cylinder and a second half resonator part 39 having a half cylinder extending continuously from the second inlet duct half part 37 are provided. A second case passage forming portion 38 is formed at the left edge of the bottom wall side peripheral wall portion 36. The second case molded body 35 is integrally formed of a hard resin material.

As shown in FIGS. 2 and 4, the case 20 is formed by joining the periphery of the first case molded body 30 and the periphery of the second case molded body 35 by vibration welding.
That is, the case main body 21 is formed by joining the peripheral edge of the opening-side peripheral wall portion 31 and the peripheral edge of the bottom wall-side peripheral wall portion 36. The inlet duct 26 is formed by joining the peripheral edge of the first inlet duct half part 32 and the peripheral edge of the second inlet duct half part 37. The periphery of the first resonator half 34 and the periphery of the second resonator half 39 are joined together to form a Helmholtz resonator 48.

Further, the case passage 40 is formed by joining the periphery of the first case passage forming portion 33 and the periphery of the second case passage forming portion 38.
<Cap 50>
As shown in FIGS. 3 and 5, the cap 50 includes a flat cap body 51 having a peripheral wall 53 and a top wall 54 surrounding the opening 52, and an outlet 56 formed integrally with the cap body 51. Yes.

As shown in FIG. 3, a flange 55 is formed on the entire periphery of the periphery of the opening 52.
As shown in FIG. 5, a cap passage 70 that forms a portion of the reflux passage on the downstream side of the case passage 40 is formed on the left edge of the peripheral wall 53.

In a portion corresponding to the corner portion of the cap body 51, four support portions 79 for supporting the clamp 95 (see FIGS. 1 and 2) in a tiltable manner are formed.
As shown in FIGS. 3 and 5, the outlet 56 is connected to the rear surface of the peripheral wall 53 of the cap body 51 and protrudes toward the rear side, and the downstream end thereof is directed downward.

As shown in FIGS. 5 and 12, the cap passage 70 is formed from the left side edge of the cap body 51 to the left side edge of the outlet 56.
As shown in FIG. 12, the cap passage 70 is bent at the vertical hole portion 71 extending in the vertical direction, the upper end portion of the vertical hole portion 71 and extending to the rear side, and further bent and extends toward the right side. And a horizontal hole 73 to be A downstream end 74 of the horizontal hole 73 is connected to the outlet 56.

As shown in FIGS. 12 and 15, the upstream end portion 72 of the vertical hole portion 71 has a cylindrical shape and protrudes downward.
As shown in FIGS. 12 and 15, the downstream end 45 of the case passage 40 and the upstream end 72 of the cap passage 70 are located on the same axis. The hose 90 is fitted on the upstream end 72 of the cap passage 70.

  As shown in FIGS. 2 and 6 to 8, the cap 50 is divided into a first cap molded body 60 and a second cap molded body 65 provided on the upper side of the first cap molded body 60. Is formed.

  As shown in FIGS. 2, 8, and 9, the first cap molded body 60 includes an opening-side peripheral wall portion 61 that surrounds the opening 52, and an opening-side peripheral wall portion 61 that extends toward the rear side. 1 outlet forming portion 63. A first cap passage forming portion 62 is formed on the left side edge portion of the opening side peripheral wall portion 61 and the first outlet molding portion 63.

  Further, the first cap molded body 60 is formed with an outer peripheral wall 57 that covers the cap body 51 from the outer peripheral side. The support portion 79 is formed on the outer peripheral wall 57. The outer peripheral wall 57 is formed with a notch 58 that exposes the upstream end 72 of the cap passage 70 to the outside. The first cap molded body 60 is integrally formed of a hard resin material.

  As shown in FIGS. 2, 10, and 11, the second cap molded body 65 is connected to the top wall 54 of the cap body 51, the top wall side peripheral wall portion 66 that continues to the top wall 54, and the top wall side peripheral wall portion 66. And a second outlet forming portion 68 extending toward the rear side. A second cap passage forming portion 67 is formed on the left side edge of the top wall side peripheral wall portion 66. The second cap molded body 65 is integrally formed of a hard resin material.

As shown in FIGS. 2 and 5, the cap 50 is formed by joining the peripheral edge of the first cap molded body 60 and the peripheral edge of the second cap molded body 65 by vibration welding.
That is, the cap body 51 is formed by joining the peripheral edge of the opening-side peripheral wall portion 61 and the peripheral edge of the top wall-side peripheral wall portion 66. The outlet 56 is formed by joining the peripheral edge of the first outlet molding part 63 and the peripheral edge of the second outlet molding part 68.

Further, the cap passage 70 is formed by joining the peripheral edge of the first cap passage forming portion 62 and the peripheral edge of the second cap passage forming portion 67 together.
<Filter element 80>
As shown in FIGS. 2 and 3, the filter element 80 includes a filtration part 81 formed by folding a filter material sheet such as a nonwoven fabric or filter paper, and an annular seal part 82 formed on the periphery of the filtration part 81. And have. The seal portion 82 is formed of an elastic member such as closed-cell polyurethane.

  As shown in FIG. 3, the seal portion 82 is sandwiched between the flange 25 of the case 20 and the flange 55 of the cap 50, thereby sealing between the flange 55 of the cap 50 and the seal portion 82.

  In such an air cleaner 10, the upstream end portion 72 of the cap passage 70 is fitted on the hose 90 as the cap 50 is assembled to the case 20. Thereby, the case passage 40 and the cap passage 70 are communicated with each other.

According to the air cleaner for an internal combustion engine according to the present embodiment described above, the following effects can be obtained.
(1) The case 20 of the air cleaner 10 of the internal combustion engine includes an opening-side peripheral wall portion 31 that surrounds the opening 22 of the case main body 21, and a half-cylindrical first inlet duct half extending continuously from the opening-side peripheral wall portion 31. A first case molded body 30 having a split portion 32 is provided. The case 20 includes a bottom wall 24 of the case body 21, a bottom wall side peripheral wall portion 36 continuous with the bottom wall 24, and a half cylindrical second inlet duct half extending continuously with the bottom wall side peripheral wall portion 36. A second case molded body 35 having a split portion 37 is provided. The case main body 21 is formed by joining the peripheral edge of the opening side peripheral wall portion 31 and the peripheral edge of the bottom wall side peripheral wall portion 36. The inlet duct 26 is formed by joining the peripheral edge of the first inlet duct half part 32 and the peripheral edge of the second inlet duct half part 37.

  According to such a configuration, since the inlet duct 26 is formed integrally with the case main body 21, unlike the conventional configuration in which a separate inlet duct is connected to the inlet of the case, the inner circumferential surface of the intake passage is provided. No steps due to connection occur. Therefore, disturbance of the air flow can be suppressed.

  Further, since the inlet duct 26 is integral with the case body 21, only the cap 50 can be lifted and opened. For this reason, the exchange workability | operativity of the filter element 80 is not impaired.

However, if the inlet duct 26 is integral with the case main body 21, it is difficult to mold the case 20 when the shape of the inlet duct 26 is complicated and it is difficult to remove the die.
In this regard, according to the above configuration, the first case molded body 30 having the opening side peripheral wall portion 31 and the first inlet duct half portion 32, the bottom wall 24, the bottom wall side peripheral wall portion 36, and the second case. The case 20 is formed by joining the second case molded body 35 having the inlet duct half portion 37. For this reason, each case molded object 30 and 35 can be shape | molded easily, and the case 20 can be formed easily.

Therefore, it is excellent in the exchange workability | operativity and moldability of the filter element 80, and disturbance of the air flow can be suppressed.
(2) The inlet duct 26 has a folded portion 29.

In the case where the inlet duct 26 has the folded portion 29, it is difficult to perform die cutting along the extending direction.
In this regard, according to the above configuration, since the inlet duct 26 has a divided structure of the first inlet duct half part 32 and the second inlet duct half part 37, the inlet duct 26 is integrally formed. The case 20 can be easily formed.

  (3) The inlet duct 26 is connected to the front surface of the peripheral wall 23 of the case main body 21 and extends along the circumferential direction, and a bulging portion 262 bulging from the connecting portion 261 toward the front side. And a first extending portion 27 connected to one end of the bulging portion 262 in the circumferential direction and extending along the circumferential direction. The air flow path cross-sectional area is gradually increased from the first extending portion 27 toward the connecting portion 261.

  According to such a configuration, air is introduced into the case body 21 through the first extending portion 27, the bulging portion 262, and the connecting portion 261 of the inlet duct 26. At this time, since the air flow path cross-sectional area gradually increases from the first extending portion 27 toward the connecting portion 261, it is possible to suppress an abrupt decrease in the air pressure and reduce the air flow. Disturbance can be suppressed.

  (4) The first case molded body 30 is formed with a half-cylinder-shaped first resonator half part 34. The second case molded body 35 is formed with a half resonator-shaped second resonator half 39. A Helmholtz resonator 48 is formed by joining the periphery of the first resonator half 34 and the periphery of the second resonator half 39.

  According to such a configuration, since the resonator 48 is integrally formed with the inlet duct 26, a process of separately attaching the resonator 48 to the inlet duct 26 becomes unnecessary.

  (5) The case 20 is formed with a case passage 40 constituting a part of a recirculation passage for recirculating blow-by gas of the internal combustion engine to the intake passage. The cap 50 is formed with a cap passage 70 that constitutes a portion of the reflux passage on the downstream side of the case passage 40. The case passage 40 and the cap passage 70 are configured to communicate with each other when the case 20 and the cap 50 are assembled.

  According to such a configuration, by assembling the case 20 and the cap 50 of the air cleaner 10, the case passage 40 and the cap passage 70 which constitute a part of the return passage for returning the blow-by gas of the internal combustion engine to the intake passage are communicated with each other. The

  Thereby, it becomes possible to shorten the length of the hose which comprises a part of recirculation | reflux channel | path of blow-by gas, and the hose of a special shape becomes unnecessary. Therefore, the configuration around the air cleaner 10 can be simplified.

(6) The case passage 40 is formed at the edge of the case body 21. The cap passage 70 is formed at the edge of the cap body 51.
According to such a configuration, it is possible to appropriately avoid the influence of the internal space of the case body 21, that is, the shape of the intake passage due to the provision of the case passage 40 in the case 20. In addition, it is possible to appropriately avoid the influence of the internal space of the cap body 51, that is, the shape of the intake passage due to the provision of the cap passage 70 in the cap 50.

(7) The downstream end 45 of the case passage 40 and the upstream end 72 of the cap passage 70 are located on the same axis.
According to such a configuration, the case passage 40 and the cap passage 70 can be easily communicated with each other by assembling the opening 22 of the case 20 of the air cleaner 10 and the opening 52 of the cap 50 facing each other. Therefore, the assembly work of the case 20 and the cap 50 can be easily performed.

(8) A straight tubular hose 90 is interposed between the downstream end 45 of the case passage 40 and the upstream end 72 of the cap passage 70.
According to such a configuration, the downstream end 45 of the case passage 40 and the upstream end 72 of the cap passage 70 communicate with each other via the hose 90.

  Further, since the straight tubular hose 90 functions as a guide when the cap 50 is assembled to the case 20, the assembling work of the case 20 and the cap 50 can be easily performed.

(9) The hose 90 is fixed to the downstream end 45 of the case passage 40.
When removing the cap 50 from the case 20, the hose 90 may come off from the case 20. In this case, when the cap 50 is assembled to the case 20, it is necessary to reassemble the hose 90 to the downstream end 45 of the case passage 40, and the assembling work becomes complicated.

  In this regard, according to the above configuration, the hose 90 is fixed to the downstream end 45 of the case passage 40, and therefore the hose 90 does not come off the case 20 when the cap 50 is removed from the case 20. For this reason, when the cap 50 is assembled to the case 20, it is not necessary to reassemble the hose 90 to the downstream end 45 of the case passage 40, and the assembly operation of the cap 50 to the case 20 can be easily performed. .

  (10) The cap 50 has an outer peripheral wall 57 that covers the cap body 51 from the outer peripheral side. The outer peripheral wall 57 is formed with a notch 58 that exposes the upstream end 72 of the cap passage 70 to the outside.

  It is conceivable that an outer peripheral wall 57 that covers the cap main body 51 from the outer peripheral side is integrally formed, and a support portion 79 of a clamp 95 for fastening the case 20 and the cap 50 is formed on the outer peripheral wall 57.

  However, in this case, if the upstream end portion 72 of the cap passage 70 is covered by the outer peripheral wall 57 from the outer peripheral side, the cap passage 70 is connected to the hose 90 fixed to the downstream end portion 45 of the case passage 40. It is difficult for an operator to visually confirm whether or not the upstream end portion 72 is inserted to a proper position.

  In this regard, according to the above configuration, since the upstream end 72 of the cap passage 70 is exposed to the outside through the notch 58, the operator can use the upstream end 72 of the cap passage 70 with respect to the hose 90. It can be visually confirmed that is inserted to a proper position.

(11) The downstream end 74 of the cap passage 70 is connected to the outlet 56.
When the downstream end 74 of the cap passage 70 is connected to the cap body 51, the blow-by gas is recirculated into the cap body 51. Therefore, when the cap main body 51 has a flat shape as in the present embodiment, oil mist contained in the blow-by gas is likely to adhere to the filtration part 81 of the filter element 80, thereby reducing the filtration performance of the filtration part 81. There is a fear.

  In this regard, according to the above configuration, since the downstream end 74 of the cap passage 70 is connected to the outlet 56, the blow-by gas flows toward the downstream side of the outlet 56, and the oil mist flows through the filter element 80. Adhering to the filtration part 81 can be appropriately avoided.

  (12) The case passage 40 has an upstream vertical hole portion 41 extending upward from the upstream end portion 42 thereof, and a horizontal hole portion 43 bent and extended at the upper end portion of the upstream vertical hole portion 41. doing.

  According to such a configuration, when the blow-by gas passes through the bent portion between the upstream vertical hole portion 41 and the horizontal hole portion 43 of the case passage 40 as shown by the broken arrow in FIG. By colliding with the ceiling surface 46, the oil mist contained in the blow-by gas is easily separated. Therefore, it is possible to suppress the oil mist contained in the blow-by gas from flowing into the intake passage.

(13) The cap passage 70 has a vertical hole portion 71 extending upward from the upstream end portion 72 thereof, and a horizontal hole portion 73 bent and extended from the upper end portion of the vertical hole portion 71.
According to such a configuration, when blow-by gas passes through the bent portion between the vertical hole portion 71 and the horizontal hole portion 73 of the cap passage 70 as shown by the broken arrow in FIG. The oil mist contained in the blow-by gas is easily separated by colliding with 75. Therefore, it is possible to suppress the oil mist contained in the blow-by gas from flowing into the intake passage.

  (14) The case 20 includes a first case molded body 30 having an opening-side peripheral wall portion 31 and a first case passage forming portion 33, a bottom wall 24, a bottom wall-side peripheral wall portion 36, and a second case passage forming. And a second case molded body 35 having a portion 38. The case main body 21 is formed by joining the peripheral edge of the opening side peripheral wall portion 31 and the peripheral edge of the bottom wall side peripheral wall portion 36. The case passage 40 is formed by joining the first case passage forming portion 33 and the second case passage forming portion 38 to each other.

  According to such a configuration, the case passage 40 is formed by joining the first case passage forming portion 33 and the second case passage forming portion 38 together. For this reason, even when the shape of the case passage 40 is complicated and it is difficult to remove the die, the case 20 can be easily formed.

  (15) The cap 50 includes the first cap molded body 60 having the opening side peripheral wall portion 61 and the first cap passage forming portion 62, the top wall 54, the top wall side peripheral wall portion 66, and the second cap passage forming. And a second cap molded body 65 having a portion 67. The cap body 51 is formed by joining the peripheral edge of the opening-side peripheral wall portion 61 and the peripheral edge of the top wall-side peripheral wall portion 66. The cap passage 70 is formed by joining the first cap passage forming portion 62 and the second cap passage forming portion 67 together.

  According to such a configuration, the cap passage 70 is formed by joining the first cap passage forming portion 62 and the second cap passage forming portion 67 together. For this reason, the cap 50 can be easily formed even when the shape of the cap passage 70 is complicated and it is difficult to remove the die.

<Modification>
In addition, the said embodiment can also be changed as follows, for example.
The inlet duct 26 and the resonator 48 can be formed separately. In this case, a resonator may be connected to the inlet duct.

-The inlet duct 26 is not limited to what has the folding | turning part 29, The shape can be changed suitably.
In the above embodiment, the cap 50 is formed by joining the first cap molded body 60 and the second cap molded body 65, but the cap may be formed by integral molding.

  In the above embodiment, the first case molded body 30 and the second case molded body 35 are joined by vibration welding. However, the first case molded body 30 and the second case molded body 35 are bonded to each other by an adhesive. You may make it join by.

  DESCRIPTION OF SYMBOLS 10 ... Air cleaner, 20 ... Case, 21 ... Case main body, 22 ... Opening, 23 ... Perimeter wall, 24 ... Bottom wall, 25 ... Flange, 26 ... Inlet duct, 261 ... Connection part, 262 ... Swelling part, 27 ... 1st 28 ... second extending portion, 29 ... folded portion, 30 ... first case molded body, 31 ... opening-side peripheral wall portion, 32 ... first inlet duct halved portion, 33 ... first 34 ... first resonator half part, 35 ... second case molded body, 36 ... bottom wall side peripheral wall part, 37 ... second inlet duct half part, 38 ... second case Passage forming part, 39 ... second resonator half split part, 40 ... case passage, 41 ... upstream side vertical hole part, 42 ... upstream side end part, 43 ... side hole part, 44 ... downstream side vertical hole part, 45 ... downstream side end 46, ceiling surface, 48 ... resonator, 49 ... hooked part, 50 ... key , 51 ... cap body, 52 ... opening, 53 ... peripheral wall, 54 ... top wall, 55 ... flange, 56 ... outlet, 57 ... outer peripheral wall, 58 ... notch, 60 ... first cap molding, 61 ... Opening side peripheral wall part, 62 ... first cap passage forming part, 63 ... first outlet molding part, 65 ... second cap molded body, 66 ... top wall side peripheral wall part, 67 ... second cap passage forming part , 68 ... second outlet molding part, 70 ... cap passageway, 71 ... vertical hole part, 72 ... upstream end part, 73 ... horizontal hole part, 74 ... downstream end part, 75 ... ceiling surface, 79 ... support part, 80 ... Filter element, 81 ... Filtration part, 82 ... Seal part, 90 ... Hose (connection member), 91 ... Clip, 95 ... Clamp.

Claims (4)

A case having a case body and an inlet duct formed integrally with the case body;
A cap having an outlet;
A filter element provided between the opening of the case body and the opening of the cap facing the opening;
The case includes a first case molded body having an opening-side peripheral wall that surrounds the opening of the case main body, and a half-cylindrical first inlet duct half-split extending continuously from the opening-side peripheral wall. A second wall having a bottom wall of the case main body, a bottom wall side peripheral wall portion continuous with the bottom wall, and a half cylindrical second inlet duct half portion extending continuously with the bottom wall side peripheral wall portion. A case molded body,
The case main body is formed by joining the peripheral edge of the opening side peripheral wall part and the peripheral edge of the bottom wall side peripheral wall part,
The inlet duct is formed by joining the peripheral edge of the first inlet duct half part and the peripheral edge of the second inlet duct half part,
Air cleaner for internal combustion engines. The inlet duct has a folded portion,
The air cleaner for an internal combustion engine according to claim 1. The inlet duct is connected to one surface of the peripheral wall of the case body and extends along the circumferential direction; a bulging portion bulged from the connecting portion toward the outer periphery; and An extended portion connected to one end in the circumferential direction in the bulging portion and extending along the circumferential direction;
The flow passage cross-sectional area of air is gradually increased from the extending portion toward the connecting portion,
An air cleaner for an internal combustion engine according to claim 1 or 2. The first case molded body is formed with a half cylinder-shaped first resonator half part,
The second case molded body is formed with a half-cylinder-shaped second resonator half part,
The Helmholtz resonator is formed by joining the periphery of the first resonator half and the periphery of the second resonator half,
An air cleaner for an internal combustion engine according to any one of claims 1 to 3.

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