JP2016070183A - Canister - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a canister which inhibits vibration resulting from pulsation and enables improvement of quietness in a vehicle cabin.SOLUTION: A canister 1 processes an evaporative fuel from a fuel tank of a vehicle between the fuel tank and an engine. The canister 1 is formed by incorporating an adsorbent 11 into a casing 10. The canister 1 includes: a partition plate 23 which partitions an interior part of the casing 10 into a first space 1A and a second space 1B; a purge port 25 which is provided at a first space 1A side portion 21a of the casing 10 and discharges the evaporative fuel adsorbed by the adsorbent 11 to the engine side; and a fixing part 29 which is provided at a second space 1B side portion 21b of the casing 10 and fixed to a vehicle body. The partition plate 23 is formed into an arc shape expanding to the second space 1B side.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a canister for treating evaporated fuel (fuel gas) evaporated in a fuel tank of a vehicle.

  2. Description of the Related Art Conventionally, a technique for preventing leakage of a fuel component to the outside of a vehicle by guiding evaporated fuel evaporated in a fuel tank of a vehicle into a cylinder of an engine is known (see, for example, Patent Document 1). In this technique, the vaporized fuel in the fuel tank is temporarily recovered by a canister containing an adsorbent, and purge gas containing the vaporized fuel desorbed from the canister is introduced into the intake passage. A purge valve for adjusting the flow rate of the purge gas is interposed on the purge passage connecting the canister and the intake passage, and the opening degree is controlled according to the operating state of the engine.

JP 2012-237281 A

  Meanwhile, it is known that pulsation (purge pulsation) occurs in the purge passage as the purge valve is opened and closed. This purge pulsation is transmitted to the canister via the purge passage, and may vibrate the canister to generate vibration noise. In addition, the vibration of the canister is transmitted to the vehicle body, and vibration noise may reach the vehicle interior via the vehicle body. These vibration noises cause a decrease in the quietness in the passenger compartment.

  Depending on the mounting position of the canister, the pulsation of the intake system of the engine may be transmitted to the canister and vibrate the canister in the same manner as the purge pulsation. In addition, in order to reduce the vibration noise caused by such pulsation, it has been conventional to devise a canister mounting method or add pulsation reducing parts, but the structure is complicated and large Led to an increase in costs.

  The present invention has been developed in view of the above-described problems, and an object of the present invention is to provide a canister that can suppress vibration caused by pulsation and improve quietness in a vehicle interior. I will. The present invention is not limited to this purpose, and is a function and effect derived from each configuration shown in the embodiments for carrying out the invention described later, and other effects of the present invention are to obtain a function and effect that cannot be obtained by conventional techniques. Can be positioned.

  (1) The canister disclosed here is a canister that incorporates an adsorbent in a casing and processes evaporated fuel from a fuel tank of a vehicle between the fuel tank and the engine. The canister is provided in a partition plate that partitions the interior of the casing into a first space and a second space, and a portion of the casing on the first space side, and the evaporated fuel adsorbed on the adsorbent is A purge port that discharges to the engine side, and a fixing portion that is provided at a portion of the casing on the second space side and is fixed to the vehicle body. The partition plate is formed in an arc shape bulging toward the second space.

(2) It is preferable that the purge port is provided at a center portion of an upper surface of the casing located above the first space in a state of being fixed to the vehicle body.
(3) It is preferable that the said casing has a cylindrical side part.
(4) At this time, it is preferable that the said partition plate is formed in circular arc shape in which cross-sectional shape has a curvature smaller than the said side part of the said casing. The cross-sectional shape is a cross-sectional shape along the direction in which the first space and the second space are arranged side by side.

  According to the disclosed canister, since the partition plate that partitions the inside of the casing is formed in an arc shape, the surface rigidity of the partition plate can be increased. Moreover, since this partition plate bulges to the second space side, the distance from the purge port, which is the input point of pulsation, to the partition plate can be increased. From these, the vibration of the partition plate due to pulsation can be suppressed, so that the vibration transmitted to the vehicle body side can be reduced. Further, since the fixed portion is provided in the second space side portion of the casing, the second space can be interposed between the pulsation input point and the transmission position (vibration output point) to the vehicle body side. Thereby, the vibration transmitted to the vehicle body side can be further reduced. Therefore, according to the disclosed canister, the vibration caused by the pulsation can be suppressed and the quietness in the passenger compartment can be improved.

It is a figure which shows the structure of the canister which concerns on one Embodiment, (a) is a perspective view, (b) is a top view. 2 is a cross-sectional view of the canister of FIG. 1, (a) is a cross-sectional view taken along the line AA of FIG. 1 (b), and (b) is a cross-sectional view taken along the line BB of FIG. It is a system configuration | structure figure of a canister. It is a cross-sectional view of the canister which concerns on a modification, (a) is the 1st modification which changed the outer shape of the casing, (b) is the 2nd modification which changed the shape of the partition plate.

  Hereinafter, embodiments will be described with reference to the drawings. Note that the embodiment described below is merely an example, and there is no intention to exclude various modifications and technical applications that are not explicitly described in the following embodiment. Each configuration of the following embodiments can be implemented with various modifications without departing from the spirit thereof, and can be selected as necessary or can be appropriately combined.

[1. Constitution]
As shown in FIG. 3, the canister 1 according to the present embodiment temporarily recovers the evaporated fuel (fuel gas) evaporated in the fuel tank 2 and recovers the evaporated fuel when the negative pressure of the engine 3 is introduced. An evaporative fuel processing apparatus that processes evaporative fuel by releasing fuel. The canister 1 is provided between the fuel tank 2 and the engine 3. The canister 1 and the fuel tank 2 communicate with each other through a vapor passage 4, and the canister 1 and the intake passage 3 a of the engine 3 communicate with each other through a purge passage 5.

  The canister 1 has three ports: a tank port 24 to which the vapor passage 4 is connected, a purge port 25 to which the purge passage 5 is connected, and an atmospheric port 26 opened to the atmosphere. The canister 1 is filled with an adsorbent 11 (see FIG. 2A) that adsorbs evaporated fuel. The adsorbent 11 is, for example, activated carbon or a silicon-based material. The evaporated fuel evaporated in the fuel tank 2 flows into the canister 1 through the vapor passage 4 and is collected by being adsorbed by the adsorbent 11.

  On the purge passage 5 connecting the canister 1 and the engine 3, a purge valve 6 whose opening degree is controlled according to the operating state of the engine 3 is interposed. When the purge valve 6 is closed, the communication state of the purge passage 5 is interrupted, so that no gas flows in the purge passage 5. On the other hand, when the purge valve 6 is open, the negative pressure in the intake passage 3a of the engine 3 is introduced into the canister 1, so that air flows into the canister 1 through the atmospheric port 26, and the evaporation recovered by the canister 1 Fuel is released. This evaporated fuel is mixed with air, sucked as purge gas to the engine 3 side, burned in the cylinder of the engine 3 and processed.

  The structure of the canister 1 according to this embodiment will be described with reference to FIGS. As shown in FIGS. 1A, 1 </ b> B, and 2 </ b> A, the canister 1 includes three ports 24, 25, and 26 at the top of a cylindrical casing 10, and the adsorbent 11 is attached to the casing 10. Built-in. The canister 1 of this embodiment is mounted on a vehicle while maintaining the vertical direction shown in the figure. That is, the vertical direction of the canister 1 described here means the vertical direction when the canister 1 is fixed to the vehicle body, and coincides with the vertical direction of the vehicle (the direction of gravity is downward and the opposite is upward).

  The casing 10 has a circular upper surface portion 21 (upper surface) and a substantially cylindrical side surface portion 22, and a main body portion 20 that is open at the bottom, and a lid portion 30 that is attached to the lower end portion of the main body portion 20 and closes the opening. It consists of. The main body portion 20 and the lid portion 30 of the present embodiment are integrally formed with a resin excellent in impact resistance, vibration resistance, and the like. The upper surface portion 21 and the side surface portion 22 of the main body portion 20 are formed to have substantially the same thickness, and the lid portion 30 is formed to be thicker than the main body portion 20.

  As shown in FIGS. 2 (a) and 2 (b), the main body 20 has a partition plate 23 that partitions the space inside the casing 10 into a main chamber 1A (first space) and a sub chamber 1B (second space). Have. The main chamber 1 </ b> A and the sub chamber 1 </ b> B are provided side by side in a direction perpendicular to the vertical direction (hereinafter referred to as a horizontal direction) inside the casing 10.

  The partition plate 23 of the present embodiment has a plate shape having substantially the same thickness as the upper surface portion 21 and the side surface portion 22, and has an arc shape in which the cross-sectional shape in the lateral direction (parallel direction) is curved toward the sub chamber 1B. Formed to be. In other words, the partition plate 23 is formed in a partial cylindrical surface shape that bulges toward the sub chamber 1 </ b> B, and is provided so that its axis K (the center point of the arc) extends in the vertical direction of the casing 10. The position of the partition plate 23 and its curvature are set according to the capacity ratio between the main chamber 1A and the sub chamber 1B. The capacity ratio between the main chamber 1A and the sub chamber 1B is set in advance so that the predetermined performance of the canister 1 is ensured.

  Of the four surrounding sides, the partition plate 23 has an arcuate upper side 23a in intimate contact with the inner surface of the upper surface portion 21, and two linear side sides 23b and 23c in intimate contact with the inner surface of the side surface portion 22, respectively. An arc-shaped lower side 23 d is provided separately from the lid 30. That is, the partition plate 23 does not completely divide the space inside the casing 10 into two, but partially divides the space inside the casing 10 into two. The space inside the casing 10 is divided into separate spaces of the main chamber 1 </ b> A and the sub chamber 1 </ b> B by the partition plate 23 in the upper part and the middle part, but is connected in the lower part.

  As shown in FIG. 2B, the axis K of the partition plate 23 is an alternate long and short dash line L that connects the intersections of the partition plate 23 and the side surface portion 22 (points on the side sides 23b and 23c) in the transverse cross section. It is on the vertical bisector M and is provided on the main chamber 1A side (left side in the figure) from the center point O of the casing 10. That is, the radius of curvature of the partition plate 23 is larger than the radius of the casing 10, and the partition plate 23 is formed with a smaller curvature than the side surface portion 22.

  As shown in FIGS. 1A and 1B and FIGS. 2A and 2B, the main body portion 20 is a portion of the upper surface portion 21 on the main chamber 1A side (hereinafter referred to as a first upper surface portion 21a). The tank port 24 and the purge port 25 are provided, and the atmosphere port 26 is provided in a portion of the upper surface portion 21 on the side of the sub chamber 1B (hereinafter referred to as the second upper surface portion 21b). That is, the tank port 24 and the purge port 25 are provided in the first upper surface portion 21a located above the main chamber 1A and open to the main chamber 1A. On the other hand, the atmospheric port 26 is provided in the second upper surface portion 21b located above the sub chamber 1B and opens to the sub chamber 1B.

  The main body portion 20 is recessed between a groove portion 27 (hereinafter referred to as a first groove portion 27) recessed around the atmosphere port 26 of the second upper surface portion 21b, and between the first upper surface portion 21a and the second upper surface portion 21b. And a groove portion 28 (hereinafter referred to as a second groove portion 28). The first groove portion 27 is formed on the entire outer periphery of the atmospheric port 26 and is provided continuously with the second groove portion 28. The second groove portion 28 is provided across the upper surface portion 21, is continuous with the first groove portion 27 at an intermediate portion thereof, and both end portions thereof are provided to be opened laterally.

  The second groove portion 28 of the present embodiment is located above the partition plate 23, is curvedly formed along the partition plate 23, and both end portions thereof extend to the side surface portion 22. That is, the second groove portion 28 partitions the upper surface portion 21 of the main body portion 20 into a first upper surface portion 21a and a second upper surface portion 21b. Here, the second groove portion 28 is formed to a depth slightly larger than the depth of the first groove portion 27, and is formed to have a width substantially the same as the thickness of the partition plate 23.

  These two grooves 27 and 28 regulate the fuel dripping position when an abnormality occurs in a component such as a valve in the fuel tank 2 and liquid fuel leaks from the atmospheric port 26. . The first groove 27 functions as a leakage path that guides the fuel to the second groove 28 when fuel leaks from the atmospheric port 26. The second groove portion 28 functions as a leakage path that guides the fuel from the first groove portion 27 to a specific portion of the side surface portion 22 of the main body portion 20. As a result, the leaked fuel is dropped downward from both end portions of the second groove portion 28 through the side surface portion 22.

  The purge port 25 of the present embodiment is provided at the central portion C of the first upper surface portion 21a and opens to the main chamber 1A at the central portion C. The center portion C is on the vertical bisector M and means a position where the distance from the side surface portion 22 and the distance from the partition plate 23 are equal. The center portion C of the first upper surface portion 21a can be said to be an intersection portion between the straight line extending in the vertical direction through the center of the main chamber 1A and the first upper surface portion 21a. The purge port 25 of the present embodiment is provided so that the center point of the opening coincides with the center portion C of the first upper surface portion 21a.

  The tank port 24 of the present embodiment is provided at a position shifted from the purge port 25 on the first upper surface portion 21a, and the atmospheric port 26 is provided at the center of the second upper surface portion 21b. The positions of these two ports 24 and 26 are not particularly limited, and are set in consideration of the arrangement relationship with other in-vehicle devices (for example, the fuel tank 2), ease of molding of the canister 1, and the like.

The main body 20 has a fixing portion 29 for fixing the canister 1 to the vehicle body. The fixing portion 29 is provided in a portion of the side surface portion 22 of the main body portion 20 that is farthest from the purge port 25 across the sub chamber 1B. That is, the fixing portion 29 is the side surface portion 22 on the side of the sub chamber 1B, and is provided so that the center thereof is located on the vertical bisector M.
The canister 1 is formed by filling the adsorbent 11 in the main body 20 and then welding the lid 30 to the lower end of the main body 20. Further, the canister 1 is fixed to the vehicle body by attaching a fixing portion 29 to a holding member (not shown) provided on the vehicle body side, for example.

[2. Action, effect]
The purge pulsation generated when the purge valve 6 is opened and closed and the pulsation of the intake system of the engine 3 are input from the purge port 25 to the canister 1 through the purge passage 5 and transmitted to the vehicle body through the fixing portion 29. That is, the purge port 25 serves as an input point for pulsation, and the fixed portion 29 serves as an output point for vibration caused by the pulsation. It should be noted that the pulsation transmitted to the canister 1 spreads concentrically from the input point, and attenuates and decreases toward the outside.

  In the canister 1 described above, since the cross-sectional shape of the partition plate 23 that partitions the inside of the casing 10 is formed in an arc shape (arc shape), the surface rigidity of the partition plate 23 can be increased, and the partition plate 23 is less likely to vibrate. be able to. Further, since the partition plate 23 is formed in an arc shape that bulges toward the sub chamber 1B, the distance from the purge port 25, which is a pulsation input point, to the partition plate 23 can be increased. Also by this, the vibration of the partition plate 23 caused by pulsation can be suppressed.

  Further, since a fixing portion 29 for fixing the canister 1 to the vehicle body is provided on the side surface portion 22 on the side of the sub chamber 1B in the casing 10, a pulsation input point (purge port 25) and a transmission position (vibration of vibration) to the vehicle body side are provided. The sub chamber 1B can be interposed between the fixed portion 29) which is an output point. Thereby, since the pulsation transmitted from the purge port 25 to the canister 1 is attenuated in the sub chamber 1B, the vibration transmitted to the vehicle body side can be further reduced. Therefore, according to the canister 1 described above, it is possible to suppress the vibration caused by the pulsation and improve the quietness in the passenger compartment.

  In the canister 1 described above, since the purge port 25 is provided at the center C of the first upper surface portion 21a located above the main chamber 1A, the distance from the pulsation input point to the side surface portion 22 and the partition plate 23 Any distance can be increased. In other words, a pulsation input point can be provided at a position farthest from the side surface portion 22 and the partition plate 23. Thereby, each vibration of the side part 22 and the partition plate 23 resulting from pulsation can be suppressed, and the quietness in a vehicle interior can be improved.

Furthermore, in the canister 1 described above, since the casing 10 has the cylindrical side surface portion 22, the surface rigidity of the side surface portion 22 can be increased, and the side surface portion 22 can be made difficult to vibrate. Thereby, the vibration of the entire canister 1 due to pulsation can be suppressed, and the quietness in the passenger compartment can be further improved.
In the canister 1 described above, the partition plate 23 is formed in an arc shape in which the cross-sectional shape in the lateral direction has a smaller curvature than the side surface portion 22 of the casing 10, so that the shape of the casing 10 can be simplified, It is possible to easily secure a capacity ratio between the main chamber 1A and the sub chamber 1B.

  In the present embodiment, the main body 20 constituting the casing 10 of the canister 1 is integrally formed of resin. For this reason, the fluidity | liquidity of resin can be improved by making the thickness of each planar part (the upper surface part 21, the side part 22, the partition plate 23) of the main-body part 20 constant, and productivity is improved. be able to. In particular, since the second groove portion 28 provided in the upper surface portion 21 is located above the partition plate 23 and is curved along the partition plate 23, the thinning of the upper surface portion 21 due to the formation of the second groove portion 28 is reduced. Can be prevented. Also by this, the fluidity | liquidity of resin can be improved and productivity can be improved.

[3. Others]
Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.
The canister 1 described above is configured by filling the cylindrical casing 10 with the adsorbent 11, but the shape of the casing 10 is not limited to the cylindrical shape. For example, as shown to Fig.4 (a), casing 10 'may be comprised with the square-shaped main-body part 20'. Even in such a casing 10 ′, the same effect as that of the above-described embodiment can be obtained by including the partition plate 23 whose lateral cross-sectional shape bulges toward the sub chamber 1 </ b> B as in the above-described embodiment. It will be a thing.

  In addition, the specific configuration of the partition plate 23 is not limited to the above-described one, and a capacity ratio between the main chamber 1A and the sub chamber 1B can be secured, and the shape and arrangement of the partition plate 23 can be used as long as the arc shape bulges toward the sub chamber 1B. Can be changed. For example, the cylindrical surface axis K of the partition plate 23 may be provided to be inclined with respect to the vertical direction of the casing 10. In other words, the partition plate 23 may have a cylindrical surface shape provided so as to extend while being inclined with respect to the vertical direction of the casing 10.

Further, as shown in FIG. 4B, the partition plate 23 ″ may be formed in an arc shape in which the transverse cross-sectional shape has a larger curvature than the side surface portion 22 of the main body portion 20 ″. Even with such a casing 10 ″, the same effects as those of the above-described embodiment can be obtained.
Further, the cross-sectional shape in the horizontal direction of the partition plate 23 is not limited to an arc shape. That is, the partition plate 23 may not have a certain curvature, and may be an arc shape such as an elliptical arc shape, a catenary shape, or a bow shape. Even if it is such a shape, there exists an effect similar to the above-mentioned embodiment.

  Moreover, the tank port 24 and the purge port 25 should just be provided in the part by the side of the main chamber 1A among the casings 10, and should just open to the main chamber 1A, The position and shape are not restricted above. For example, in the above embodiment, the purge port 25 is provided so that the center point of the opening coincides with the center part C of the first upper surface part 21a, but is provided so that the center part C is included in the opening. It may be provided, or may be provided at a position shifted from the central portion C. For example, the vibration of the partition plate 23 can be further suppressed by providing the purge port 25 at a position away from the partition plate 23 (to the left of the center portion C in FIG. 2B). Further, the tank port 24 and the purge port 25 may be provided in a line in the horizontal direction, or may be provided not on the upper surface portion 21 but on the upper portion of the side surface portion 22 on the main chamber 1A side.

Similarly, the atmospheric port 26 may be provided in the portion of the casing 10 on the side of the sub chamber 1B and may be open to the sub chamber 1B, and the position and shape thereof are not limited to those described above.
Moreover, in the said embodiment, although the fixing | fixed part 29 illustrated the canister 1 provided in the part most distant from the purge port 25 on both sides of the subchamber 1B among the side parts 22, the position and shape of the fixing | fixed part 29 are shown. It is not limited to this. At least the fixing portion 29 may be provided in a portion of the casing 10 on the sub chamber 1B side.

  Moreover, the shape of the groove parts 27 and 28 provided in the upper surface part 21 of the casing 10 is not restricted to the above-mentioned thing. For example, the first groove portion 27 and the second groove portion 28 may be formed at the same depth, or the depth of the first groove portion 27 may be larger than that of the second groove portion 28. Moreover, the 2nd groove part 28 does not need to be curved along the partition plate 23, for example, may be linear form. Further, only one of both end portions of the second groove portion 28 may be opened to the side, or the bottom surface of the second groove portion 28 may be provided to be inclined downward toward the side. These two groove portions 27 and 28 are not essential and can be omitted.

  In the canister 1 described above, the casing 10 is formed by welding the main body portion 20 and the lid portion 30 after being integrally formed with resin, but the manufacturing method of the casing 10 is not particularly limited. Further, the thickness of the main body portion 20 may not be constant. For example, the thickness of the side surface portion 22 may be larger than the thickness of the upper surface portion 21 to suppress the vibration of the side surface portion 22.

  Moreover, in the said embodiment, although the lower side 23d of the partition plate 23 was provided apart from the cover part 30 and illustrated the canister 1 with which the space inside the casing 10 was connected in the lower part, the main chamber 1A and the subchamber 1B were illustrated. The lower side 23d of the partition plate 23 may be provided to extend to the lid portion 30 as long as the gas can go back and forth through a portion (for example, a communication hole) that communicates with the lid portion 30.

1 Canister 1A Main room (first space)
1B Vice room (second space)
2 Fuel tank 3 Engine 4 Vapor passage 5 Purge passage 6 Purge valve 10, 10 ', 10 "Casing 11 Adsorbent 20, 20', 20" Main body 21 Upper surface (upper surface)
21a First upper surface portion 22, 22 ′ Side surface portion 23, 23 ″ Partition plate 24 Tank port 25 Purge port 26 Atmospheric port 27 First groove portion 28 Second groove portion 29 Fixed portion 30 Lid portion C Center portion

Claims (4)

A canister that contains an adsorbent in a casing and processes evaporated fuel from a fuel tank of a vehicle between the fuel tank and the engine,
A partition plate for partitioning the inside of the casing into a first space and a second space;
A purge port provided in a portion of the casing on the first space side and discharging the evaporated fuel adsorbed on the adsorbent to the engine side;
A fixing portion that is provided in a portion of the casing on the second space side and is fixed to the vehicle body;
The canister is characterized in that the partition plate is formed in an arc shape bulging toward the second space. 2. The canister according to claim 1, wherein the purge port is provided at a central portion of an upper surface of the casing located above the first space in a state of being fixed to the vehicle body. The canister according to claim 1, wherein the casing has a cylindrical side surface portion. The canister according to claim 3, wherein the partition plate is formed in an arc shape having a smaller cross-sectional shape than the side surface portion of the casing.

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