JP4411809B2 - Air cleaner for internal combustion engine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an air cleaner for an internal combustion engine for adsorbing fuel vapor leaking from an intake system of an internal combustion engine such as an automobile engine.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, as an air cleaner for an internal combustion engine for adsorbing fuel vapor leaking from an intake system of an internal combustion engine such as an automobile engine, a housing divided into a first housing and a second housing (also referred to as a case and a cap) And an element disposed in the housing and an adsorption sheet that is also disposed in the housing and prevents the fuel vapor from the internal combustion engine from being released to the outside air. No. 61-58676.
[0003]
[Problems to be solved by the invention]
However, such an air cleaner for an internal combustion engine has a configuration in which an adsorption sheet having a filter portion that adsorbs HC (hydrocarbon) is inserted into a resin frame. As a result, in the cooling process of the product (adsorption sheet) after insert molding, the resin frame constituting the outer peripheral portion of the adsorption sheet contracts, and distortion occurs in the adsorption filter surrounded by the resin frame. For this reason, this distortion causes disturbance in the air flow passing through the filter portion of the suction sheet, which adversely affects the measurement accuracy of the air flow rate measurement sensor (air flow meter) disposed on the downstream side of the suction sheet.
[0004]
An object of the present invention is to obtain an air cleaner for an internal combustion engine that can reduce the distortion of the filter portion of the suction sheet that occurs during manufacturing in consideration of the above facts.
[0005]
[Means for Solving the Problems]
The invention according to claim 1 is a housing divided into a first housing and a second housing;
An element sandwiched between the first housing and the second housing;
An adsorbing sheet that is fixed in the first housing or the second housing and has an outer periphery held by a resin frame;
In an internal combustion engine air cleaner having
The resin frame in the adsorption sheet is divided into a plurality of parts along the circumferential direction of the resin frame. Therefore, in the cooling process of the product after insert molding in the adsorption sheet, the resin frame constituting the outer peripheral portion Even when the shrinkage occurs, the resin frame of the suction sheet is divided into a plurality of portions along the circumferential direction, so that the shrinkage of the entire resin frame can be reduced. As a result, the distortion of the filter portion of the suction sheet caused by the shrinkage of the resin frame can be reduced as compared with the conventional structure in which the resin frame is not divided into a plurality of portions along the circumferential direction. For this reason, it is possible to suppress the turbulence of the air flow passing through the adsorption filter caused by this distortion, and it is possible to prevent the measurement accuracy of the air flow rate measuring sensor set downstream of the adsorption filter from being lowered.
[0006]
According to a second aspect of the present invention, in the air cleaner for an internal combustion engine according to the first aspect, a plurality of mounting holes are provided in the resin frame, and the mounting holes are fixed to the first housing or the second housing. And the interval between the pair of attachment holes facing each other in plan view is narrower than the interval between the pair of attachment portions fixed to the pair of attachment holes.
[0007]
Therefore, in addition to the content described in claim 1, when the adsorption filter is assembled to the first housing or the second housing, the mounting hole set in the resin frame of the adsorption filter is set in the first housing or the second housing. At this time, the distance between the pair of mounting holes facing each other in plan view is set narrower than the distance between the pair of mounting parts fixed to the pair of mounting holes. Each part of the resin frame divided into two is pulled outward, and an arbitrary tension is applied to the filter portion of the suction sheet. As a result, the strain of the filter portion of the suction sheet can be corrected by these tension tensions, so that the strain of the filter portion of the suction sheet can be further reduced in the assembled state of the housing.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of an air cleaner for an internal combustion engine of the present invention will be described with reference to FIGS.
[0009]
As shown in FIG. 3, the housing 12 of the air cleaner 10 for the internal combustion engine according to the present embodiment is formed of synthetic resin, and has a lower housing 16 as a second housing having an inlet port 14 and an outlet port 18. It is divided into an upper housing 20 as a first housing. That is, the upper surface of the lower housing 16 and the lower surface of the upper housing 20 are open.
[0010]
Further, a well-known clamp receiver 26 is formed along a circumferential direction at a predetermined portion on the outer periphery of the open portion 20 </ b> A in the upper housing 20. On the other hand, a plurality of well-known brackets are formed at predetermined intervals with respect to the circumferential direction at predetermined locations on the outer periphery of the open portion of the lower housing 16, and clamps made of metal spring materials attached to these brackets are provided. The lower housing 16 and the upper housing 20 are connected to each other by being hooked on the clamp receiver 26 of the upper housing 20.
[0011]
As shown in FIG. 4, ribs 30 are formed from the inner wall 20 </ b> B near the opening 20 </ b> A in the upper housing 20 along the flow of intake air in the upper housing 20 (arrow W in FIG. 3).
[0012]
As shown in FIG. 2, a plurality of these ribs 30 are formed at a predetermined interval along the circumferential direction of the opening 20A, and the end of each rib 30 on the opening 20A side has a heat as an attachment portion. A caulking pin 32 is provided upright.
[0013]
As shown in FIG. 4, the suction sheet 44 is inserted into the resin frame 46, and the pin 32 for heat caulking is inserted into a mounting hole 48 formed in the resin frame 46 holding the outer periphery 44 </ b> A of the suction sheet 44. Has been inserted.
[0014]
As shown in FIG. 1, a plurality of attachment holes 48 are formed along the circumferential direction of the resin frame 46. The resin frame 46 has a plurality of portions 46A, 46B, 46C, 46D, and 46E along the circumferential direction by a plurality of (six in this embodiment) slits 50 formed at the four corners and the central portion in the longitudinal direction. , 46F.
[0015]
Further, in the present embodiment, the distance between the pair of mounting holes 48 facing each other in plan view, for example, L1 and M1, is the distance between the pair of pins 32 to which the pair of mounting holes 48 are fixed. 2) is set narrower (L1 <L2, M1 <L2).
[0016]
As shown in FIG. 5, the tip 32 </ b> A of the heat caulking pin 32 is heat caulked, and the end 30 </ b> A on the opening 20 </ b> A side of the rib 30 is used when the suction sheet 44 is attached. The seat portion receives the resin frame 46.
[0017]
As shown in FIG. 3, a soft outer peripheral frame 22 </ b> A made of a nonwoven fabric formed integrally with the element 22 is provided on the outer peripheral portion of the element 22, and the outer peripheral frame 22 </ b> A is connected to the open portion 20 </ b> A of the upper housing 20. It is sandwiched between the lower housing 16 and the open portion 16A.
[0018]
Next, the operation of this embodiment will be described.
[0019]
In the present embodiment, even when the resin frame 46 constituting the outer periphery contracts during the cooling process of the product after the insert molding in the suction sheet 44, the resin frame 46 has a plurality of portions 46A along the circumferential direction by the slit 50. , 46B, 46C, 46D, 46E, and 46F, the shrinkage of the entire resin frame 46 can be reduced.
[0020]
As a result, the distortion of the filter portion 44B of the suction sheet 44 caused by the shrinkage of the resin frame 46 can be reduced as compared with the conventional structure in which the resin frame 46 is not divided into a plurality of parts along the circumferential direction. For this reason, it is possible to suppress the turbulence of the air flow passing through the filter portion 44B of the suction sheet 44 caused by this distortion, and to prevent the measurement accuracy of the air flow measurement sensor set downstream of the suction sheet 44 from being lowered. it can.
[0021]
In the present embodiment, when the suction sheet 44 is assembled to the upper housing 20, the mounting holes 48 set in the resin frame 46 of the suction sheet 44 are fixed to the pins 32 set in the upper housing 20, The distance between the pair of mounting holes 48 facing each other in plan view, for example, L1 and M1 (see FIG. 1) is the distance between the pair of pins 32 to which the pair of mounting holes 48 are fixed, L2 and M2 (see FIG. 2). ) Is set narrower (L1 <L2, M1 <L2). For this reason, arbitrary tension | tensile_strength (tension | tensile_strength) is given to the filter part 44B of the adsorption | suction sheet | seat 44 by each part 46A, 46B, 46C, 46D, 46E, 46F of the resin frame 46 being pulled outward. As a result, the strain of the filter portion 44B of the suction sheet 44 can be corrected by these tension tensions. For this reason, the distortion of the filter part 44B of the suction sheet 44 can be further reduced in the housing assembly state, and the disturbance of the air flow passing through the filter part 44B of the suction sheet 44 can be further suppressed.
[0022]
Further, in the present embodiment, by forming the slit 50 in the resin frame 46, the amount of resin used in the resin frame 46 can be reduced, so that the cost and weight can be reduced.
[0023]
Although the present invention has been described in detail with respect to specific embodiments, the present invention is not limited to such embodiments, and various other embodiments are possible within the scope of the present invention. It will be apparent to those skilled in the art. For example, in the above embodiment, the pin 32 as the attachment portion is formed in the upper housing 20 as the first housing, but instead, the pin 32 as the attachment portion is formed in the lower housing 16 as the second housing. May be. Further, the mounting of the resin frame 46 to the housing 12 is not limited to the mounting by the mounting hole and the pin.
[0024]
Moreover, in the said embodiment, the resin frame 46 is made into six site | part 46A, 46B, 46C, 46D, 46E, 46F along the circumferential direction by the six slits 50 formed in the four corners and the longitudinal direction center part. Although divided | segmented, the position and number of the slits 50 are not limited to the said embodiment.
[0025]
【The invention's effect】
According to the first aspect of the present invention, the housing divided into the first housing and the second housing, the element sandwiched between the first housing and the second housing, and the first housing or the second housing are fixed. In the air cleaner for an internal combustion engine having an adsorbing sheet whose outer periphery is held by a resin frame, the resin frame in the adsorbing sheet is divided into a plurality of parts along the circumferential direction. It has an excellent effect that distortion can be reduced.
[0026]
According to a second aspect of the present invention, in the air cleaner for an internal combustion engine according to the first aspect, the plurality of mounting holes are provided in the resin frame, and the plurality of mounting portions are fixed to the first housing or the second housing. In addition to the effect of the first aspect, the distance between the pair of mounting holes facing each other in plan view is narrower than the distance between the pair of mounting portions fixed to the pair of mounting holes. It has an excellent effect that the strain of the filter portion of the suction sheet can be further reduced in the attached state.
[Brief description of the drawings]
FIG. 1 is a plan view showing an adsorption sheet of an air cleaner for an internal combustion engine according to an embodiment of the present invention.
FIG. 2 is a perspective view showing a part of an upper housing of an air cleaner for an internal combustion engine according to an embodiment of the present invention.
FIG. 3 is a side sectional view showing an air cleaner for an internal combustion engine according to an embodiment of the present invention.
FIG. 4 is an enlarged side sectional view showing a part of an air cleaner for an internal combustion engine according to an embodiment of the present invention.
FIG. 5 is an enlarged side sectional view showing a part of an air cleaner for an internal combustion engine according to an embodiment of the present invention.
[Explanation of symbols]
10 Internal Air Engine Cleaner 12 Housing 16 Lower Housing (Second Housing)
20 Upper housing (first housing)
22 Element 30 Rib 32 Pin for heat caulking (mounting part)
44 Adsorption sheet 46 Resin frame 48 Mounting hole

Claims (2)

A housing divided into a first housing and a second housing;
An element sandwiched between the first housing and the second housing;
An adsorbing sheet that is fixed in the first housing or the second housing and has an outer periphery held by a resin frame;
In an internal combustion engine air cleaner having
An air cleaner for an internal combustion engine, wherein a resin frame in the adsorption sheet is divided into a plurality of portions along a circumferential direction of the resin frame. A plurality of mounting holes are provided in the resin frame, a plurality of mounting portions for fixing the mounting holes are provided in the first housing or the second housing, and a distance between the pair of mounting holes facing each other in plan view is set. 2. The air cleaner for an internal combustion engine according to claim 1, wherein the pair of mounting holes is narrower than the interval between the pair of mounting portions to which the pair of mounting holes are fixed.

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