JP2016017405A - Canister - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a canister capable of dispensing with a need to change setting of a large capacity chamber and a length of a purge pipe, reducing noise resulting from intake air pulsation, and yet preventing entry of a foreign object and a liquid from outside.SOLUTION: This invention concerns a canister in which an inlet port into which evaporative fuel flows, a purge port supplying the evaporative fuel to an internal combustion engine, and air inlet port open to the atmosphere are provided in a canister body including an adsorbent that can adsorb and desorb the evaporative fuel, comprises an atmosphere release cap that includes an inner cylinder portion attached to the air inlet port, a lid portion disposed to surround the inner cylinder portion, and an elastic member coupling the inner cylinder portion to the lid portion, the lid portion of the atmosphere release cap being supported by the inner cylinder portion attached to the air inlet port to be deformable by the elastic member.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a canister, and more particularly, to a canister that is designed to reduce noise caused by pulsation of intake air and to prevent entry of foreign matter and liquid from the outside.

A vehicle equipped with an internal combustion engine includes a canister for processing evaporated fuel generated in a fuel tank. The canister has a canister body attached to a vehicle body component such as a dash panel. The canister body contains an adsorbent capable of adsorbing and releasing evaporated fuel, an inflow port through which the evaporated fuel flows from the fuel tank, a purge port for supplying the evaporated fuel to the internal combustion engine, and an atmosphere for introducing air. And an open air introduction port.
In a conventional canister, as disclosed in Patent Document 1, in a canister fixed to a vehicle body panel member such as a partition wall, in order to prevent unpleasant noise in a vehicle interior due to propagation and vibration of pulsation of an intake system A technique is described in which a volume chamber is set in the purge port of the canister and the pulsation is attenuated and eliminated.

JP 2013-174217 A

However, when the volume chamber is set as in Patent Document 1, it is necessary to secure a certain large volume in order to have a sufficient pulsation damping effect. Further, since the volume portion must be positioned at the antinode portion of the pulsation wave in order to have the effect of pulsation attenuation, it is necessary to appropriately set the length of the purge pipe for supplying the evaporated fuel to the internal combustion engine. is there.
For this reason, the canister of Patent Document 1 can reduce the pulsation of the intake air, but has a problem of increasing the size because it requires a large volume chamber, and also requires a purge pipe having a length corresponding to the pulsation wavelength. For this reason, there is a problem that the arrangement position is restricted depending on the piping.

  The present invention provides a canister capable of reducing noise caused by intake pulsation by a structure that is not restricted in size or disposed, and that can prevent entry of foreign matter / liquid from the outside. The purpose is to provide.

  The present invention includes a canister body containing an adsorbent capable of adsorbing and releasing evaporated fuel, an inflow port through which the evaporated fuel flows, a purge port for supplying the evaporated fuel to the internal combustion engine, and an air introduction port opened to the atmosphere. The canister further includes an air release cap having an inner cylinder portion attached to the air introduction port, a lid portion arranged to surround the inner cylinder portion, and an elastic member connecting the inner cylinder portion and the lid portion. The opening cap is characterized in that a lid portion is supported by an elastic member on an inner cylinder portion attached to an air introduction port so as to be displaceable.

In the present invention, the lid portion of the air release cap is displaceable with respect to the pulsation of the intake air acting from the purge port to the air introduction port, and the air release cap functions as a dynamic damper, suppressing the pulsation of the intake air and making noise Can be reduced.
Further, according to the present invention, an air release cap having a compact structure in which an inner cylinder portion attached to the air introduction port and a lid portion arranged so as to surround the inner cylinder portion are connected by an elastic member functions as a dynamic damper. This eliminates the need for large volume chambers or purge pipes with lengths that match the pulsation wavelength, and prevents noise reduction due to intake pulsation from being enlarged or restricted in location. Can be realized.
Furthermore, according to the present invention, a labyrinth structure is formed between the inner cylinder portion and the lid portion of the air release cap, and foreign matter / liquid can be prevented from entering.

FIG. 1 is a plan view of the canister. (Example) FIG. 2 is a front view of the canister. (Example) FIG. 3 is a side view of the canister. (Example) 4 is an enlarged cross-sectional view of the air introduction port portion taken along line AA of FIG. (Example) FIG. 5 is an enlarged cross-sectional view of the air introduction port portion taken along line BB in FIG. (Example) FIG. 6 is an enlarged cross-sectional view of the air introduction port portion taken along line CC in FIG. (Example)

  Embodiments of the present invention will be described below with reference to the drawings.

1 to 6 show an embodiment of the present invention. As shown in FIGS. 1 to 3, the canister 1 is disposed on the engine room 2 side of a dash panel (vehicle body constituent member) 4 that partitions the engine room 2 and the vehicle room 3 of the vehicle. The canister 1 adsorbs and holds the evaporated fuel generated in the fuel tank 5 and supplies it to the internal combustion engine 6 for combustion.
The canister 1 includes a canister body 7 containing an adsorbent capable of adsorbing and releasing evaporated fuel. The canister body 7 is slightly raised upward by four curved side walls 8 to 11 that are continuous with each other, a lower wall 12 that closes the lower part of the side walls 8 to 11, and an upper wall 13 that closes the upper part of the side walls 8 to 11. It is formed in a substantially quadrangular frustum shape that narrows down. The upper wall 13 of the canister body 7 is provided with an inflow port 14, a purge port 15, and an air introduction port 16. An evaporative fuel inflow pipe 17 for introducing evaporative fuel from the fuel tank 5 is connected to the inflow port 14. A purge pipe 18 for supplying evaporated fuel to the internal combustion engine 6 is connected to the purge port 15. The air introduction port 16 is opened to the atmosphere in order to introduce air for separating the evaporated fuel.
The canister 1 is provided with attachment portions 19 and 20 for attachment to the dash panel 4 on the side walls 8 to 11 of the canister body 7. In this embodiment, mounting portions 19 and 20 formed in a common shape are provided to project from two side walls 8 and 9 that are continuous in a direction crossing each other. Each of the attachment portions 19 and 20 is formed separately in two in the vertical direction. Each mounting portion 19, 20 is formed in a tapered shape so that the width becomes narrower as it goes downward in the vertical direction when viewed from the horizontal direction, and from the side walls 8, 9 when viewed from the vertical direction. It is formed in a substantially inverted trapezoidal shape so that the width is increased according to the distance.

The canister 1 is attached to a bracket 23 in which one of the attachment portions 19 and 20 having a common shape is fixed to the dash panel 4. As shown in FIGS. 1 and 3, the bracket 23 includes a fixture 24 that is fixed to the dash panel 4 and an engagement tool 25 that engages the canister 1.
The fixing tool 24 is formed in a substantially hat shape in a side view by projecting an intermediate connecting portion 27 in a direction away from the dash panel 4 with respect to the fixing portions 26 and 26 at both ends in the vertical direction. The fixing portions 26 and 26 are attached to the dash panel 4 by fixing bolts 28 and 28, respectively. An engaging tool 25 to which any one of the attaching portions 19 and 20 is engaged is connected to the connecting portion 27.
The engaging tool 25 is formed in a substantially hat shape opposite to the fixing tool 24 in a side view by projecting an intermediate connecting part 30 toward the dash panel 4 with respect to the engaging parts 29, 29 at both ends in the vertical direction. Is done. Each engaging portion 29, 29 is formed with a pair of engaging protrusions 31, 31 that protrude from both sides in the width direction. The pair of engaging protrusions 31 and 31 are tapered so that the width becomes narrower toward the lower side in the vertical direction when viewed from the horizontal direction, as in the mounting portions 19 and 20, and also viewed from the vertical direction. In this case, it is formed in a substantially trapezoidal shape so that the interval becomes narrower as the distance from the engaging portions 29 and 29 increases. The engagement protrusions 31 and 31 are formed so as to be spaced apart in the vertical direction so as to correspond to the mounting portions 19 and 20 formed separately in two in the vertical direction. The connecting part 30 is connected to the connecting part 27 of the fixing tool 24 by a connecting tool.
The canister 1 is attached to the dash panel 4 by engaging any one of the attachment portions 19 and 20 of the canister body 7 with the engagement protrusions 31 and 31 of the bracket 23 attached to the dash panel 4. . At this time, the canister 1 can change the attachment direction by selecting the attachment portions 19 and 20 and engaging the engagement protrusions 31 and 31.

The canister 1 includes an air release cap 32 attached to the air introduction port 16. As shown in FIGS. 4 to 6, the air release cap 32 includes an inner cylinder portion 33 attached to the air introduction port 16, a lid portion 34 disposed so as to surround the inner cylinder portion 33, the inner cylinder portion 33 and the lid. And an elastic member 35 connecting the portion 34.
The inner cylinder portion 33 includes a cylindrical vertical wall 36 that is externally fitted to the air introduction port 16, and an upper wall 38 that covers the upper end of the vertical wall 36 and that has an opening 37 that communicates with the canister body 7. . The lid portion 34 surrounds and opposes the vertical wall 36 of the inner cylindrical portion 33, and the upper wall 40 covers the upper end of the vertical wall 39 and faces the upper wall 38 of the inner cylindrical portion 33. Have On the vertical wall 39 of the lid portion 34, air introduction notches 41 are formed on both the left and right sides of the lower end in the vertical direction. The elastic member 35 is attached between the vertical wall 36 of the inner cylinder portion 33 and the vertical wall 39 of the lid portion 34.
The elastic member 35 is a lower portion in the vertical direction between the vertical wall 36 of the inner cylinder portion 33 and the vertical wall 39 of the lid portion 34, and is at circumferentially equidistant positions (four positions at 90 ° intervals in FIG. 6). It is attached so as to be inclined upward from the vertical wall 36 of the inner cylinder portion 33 toward the vertical wall 39 of the lid portion 34. By this support, the elastic member 35 is elastically supported so as to push up the lid portion 34 with respect to the inner cylinder portion 33, and the lid portion is interposed between the upper wall 38 of the inner cylinder portion 33 and the upper wall 40 of the lid portion 34. A space 42 that allows the displacement of the upper and lower portions 34 is formed. The space 42 communicates with the opening 37 of the upper wall 38 of the inner cylinder portion 33. In addition, the atmosphere release cap 32 is attached to the upper and lower sides of the annular cross section that communicates the atmosphere and the space 42 between the vertical wall 36 of the inner cylinder portion 33 and the vertical wall 39 of the lid portion 34 by attaching the elastic member 35. An extending passage 43 is formed.
The air release cap 32 is attached by fitting the inner cylindrical portion 33 to the air introduction port 16. The air release cap 32 in which the inner cylinder part 33 is attached to the air introduction port 16 is supported by the elastic member 35 so that the lid part 34 can be displaced by the inner cylinder part 33 attached to the air introduction port 16. The air release cap 32 includes an opening 37 in the upper wall 38 of the inner cylinder portion 33, a space 42 between the upper wall 38 of the inner cylinder portion 33 and the upper wall 40 of the lid portion 34, and a vertical wall of the inner cylinder portion 33. The inside of the canister body 7 is opened to the atmosphere through the passage 44 of the air introduction port 16 by the passage 43 between the vertical wall 39 of the lid portion 34 and 36.

The canister 1 introduces the evaporated fuel in the fuel tank 5 from the inlet port 14 into the canister body 7 via the evaporated fuel inflow pipe 17 and holds it in the adsorbent. During operation of the internal combustion engine 6, the canister 1 separates the evaporated fuel held by the adsorbent with the air introduced from the air introduction port 16 and supplies it from the purge port 15 to the intake system of the internal combustion engine 6 through the purge pipe 18. And burn.
In the canister 1, an air release cap 32 having an inner cylinder portion 33, a lid portion 34, and an elastic member 35 is attached to the air introduction port 16. In the atmosphere release cap 32 in which the inner cylinder portion 33 is attached to the air introduction port 16, the lid portion 34 is elastically supported on the inner cylinder portion 33 by the elastic member 35. The lid part 34 can be displaced in the vertical direction by a space 42 between the upper wall 38 of the inner cylinder part 33 and the upper wall 40 of the lid part 34.
In the canister 1, when the intake system pulsation propagates from the purge port 15 into the canister body 7 and acts on the air introduction port 16, the lid 34 of the air release cap 32 is elastically coupled to the inner cylinder 33. Displaces vertically.
As a result, the canister 1 has a mass in which the lid portion 34 of the atmospheric release cap 32 can be displaced with respect to the pulsation of the intake air acting from the purge port 15 to the air introduction port 16, and the atmospheric release cap 32 functions as a dynamic damper. Thus, noise can be reduced by suppressing pulsation of intake air.
Further, the canister 1 has a dynamic structure in which an air release cap 32 having a compact structure in which an inner cylindrical portion 33 attached to the air introduction port 16 and a lid portion 34 disposed surrounding the inner cylindrical portion 33 are connected by an elastic member 35 is dynamic. Since it functions as a damper and suppresses pulsation of intake air, it does not require a large volume chamber or a purge pipe with a length that matches the pulsation wavelength as in the past, and noise reduction due to intake pulsation can be reduced in size and distribution. This can be realized by a structure that is not restricted by the installation position.
Further, in the canister 1, the space 42 and the passage 43 formed between the inner cylinder portion 33 and the lid portion 34 of the air release cap 32 have a labyrinth structure, and foreign matter / liquid can be prevented from entering the canister body 7. .
Furthermore, the canister 1 has an elastic member 35 attached between the vertical wall 36 of the inner cylinder part 33 and the vertical wall 39 of the lid part 34, and the upper wall 38 of the inner cylinder part 33 and the upper wall 40 of the lid part 34 Since the space 42 in which the lid portion 34 can be displaced in the vertical direction is formed in between, the function of the dynamic damper of the air release cap 32 and the function of the labyrinth structure can be reliably achieved.

  This invention can reduce the noise caused by the pulsation of intake air and prevent the entry of foreign matter and liquid from the outside without being restricted by the layout due to the addition of a large volume chamber or the change of the purge piping. Thus, the present invention is not limited to a canister and can be applied to a device having a port through which a gas flows.

DESCRIPTION OF SYMBOLS 1 Canister 4 Dash panel 5 Fuel tank 6 Internal combustion engine 7 Canister body 14 Inflow port 15 Purge port 16 Air introduction port 19 Mounting part 20 Mounting part 23 Bracket 32 Atmospheric release cap 33 Inner cylinder part 34 Cover part 35 Elastic member 36 Vertical wall 37 Opening 38 Upper wall 39 Vertical wall 40 Upper wall 42 Space 43 Passage

Claims (2)

  In a canister having a built-in adsorbent capable of adsorbing and releasing evaporated fuel, an inflow port into which evaporated fuel flows, a purge port for supplying evaporated fuel to an internal combustion engine, and an air introduction port opened to the atmosphere, An air release cap having an inner cylinder portion attached to the air introduction port, a lid portion arranged to surround the inner cylinder portion, and an elastic member connecting the inner cylinder portion and the lid portion; An air release cap is a canister characterized in that the lid portion is supported by the elastic member to be displaceable by the inner cylinder portion attached to the air introduction port.   The inner cylinder portion includes a cylindrical vertical wall that is externally fitted to the air introduction port, and an upper wall that covers an upper end of the vertical wall and that has an opening communicating with the canister body. The portion includes a cylindrical vertical wall that surrounds and opposes the vertical wall of the inner cylindrical portion, and an upper wall that covers an upper end of the vertical wall and faces the upper wall of the inner cylindrical portion, The vertical wall of the cover part and the vertical wall of the cover part are connected by the elastic member, and the cover part can be displaced in the vertical direction between the upper wall of the inner cylinder part and the upper wall of the cover part. The canister according to claim 1, wherein a space is formed.

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