JP2000218117A - Particulate collector of internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the durability of a particulate filter. SOLUTION: Filter flat sheets 5 comprising a nonwoven fabric made of a metal and corrugated sheets 7 made of a metal are alternately laminated to form a filter laminate and this laminate is folded double around a shaft element 9 to form filter elements 10a, 10b which are, in turn, compactly inserted into an outer cylinder 11 in a double comma-shaped state. Since the filter flat sheets of the respective layers of the filter elements 10a, 10b are connected to the inner peripheral surface of the outer cylinder 11 at a short distance, the structural strength of a filter is increased and the deformation and damage of the filter elements caused by thermal expansion are prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a particulate collection device for an internal combustion engine, and more particularly, to an internal combustion engine using a filter element having a structure in which a filter plate made of a metal nonwoven fabric and a metal corrugated plate are laminated. The present invention relates to a particulate collection device for an engine.

[0002]

2. Description of the Related Art The exhaust gas of an internal combustion engine, especially the exhaust gas of a diesel engine, contains exhaust particulates mainly composed of carbon. For this reason, various particulate collection devices have been devised for collecting these particulates and preventing them from being released to the atmosphere.

[0003] An example of this type of particulate trapping apparatus is described in, for example, JP-A-9-262414. As shown in FIG. 10 (A), the collection device disclosed in the above publication has a cylindrical shape obtained by winding a laminated material obtained by alternately laminating an even number of filter flat plates 101 made of metal non-woven fabric and metal corrugated plates 103 in a roll shape. Is used. In the filter element 100 formed of the cylindrical laminated body formed as described above, a metal nonwoven fabric 101 is laminated at regular intervals by a corrugated plate 103, and an exhaust passage 105 extending along the crest ridge direction of the corrugated plate. Is formed. Further, at both ends of the cylindrical laminated body, the ends of the filter flat plate are alternately welded with the corrugated plate 103 interposed therebetween,
Each of the layers of the cylindrical laminated body has a passage 105a closed at one end and a passage 105a closed at the other end.
b are alternately arranged in the radial direction of the laminate.
In the above publication, as shown in FIG. 10 (B), a filter element made of this cylindrical laminated body is inserted into an outer cylinder 107 whose both ends are open to constitute a particulate collection device. That is, the exhaust gas flows into the passage (105a) having an open end on the upstream side in the filter element, passes through the filter plate 101, flows into the adjacent passage (105b) having the open end on the downstream side, and The exhaust fine particles contained in the exhaust gas are collected when passing through the filter flat plate 101 because they flow out of the element from the open end of the passage.

As described above, by using a filter element composed of a laminate of a filter plate made of a metal nonwoven fabric and a metal corrugated plate, the particulate collection efficiency is high and the pressure loss is relatively small. A device can be obtained.

[0005]

However, when a filter element composed of a roll-shaped cylindrical laminate 100 as shown in FIG. 10 is used, various problems may occur. For example, as a result of forming the filter element 100 as a roll-shaped cylindrical laminated body, the filter flat plate 101 and the corrugated plate 103 are firmly held by the contact with the outer cylinder 107 at the outermost peripheral portion, but the filter is provided at a portion other than the outer peripheral portion. The flat plate 101 and the corrugated plate 103 are simply a contact pressure when being wound into a roll and the filter flat plate 1 at one end of the passage.
No. 01 is fixed only by melting. Further, as a result of forming the laminated body in a roll shape, the vicinity of the element center is connected to the outer cylinder 107 through a long spiral shape extending over several layers. The binding force for fixing the plate 103 to each other tends to be small.

Further, when such a collecting device is disposed in the exhaust passage of the internal combustion engine, a large temperature difference may occur between the vicinity of the element center and the vicinity of the outer cylinder due to a change in the exhaust gas temperature. For example, when the load on the engine suddenly increases and the exhaust gas temperature rises rapidly, the temperature near the center of the element immediately rises, but the temperature rise near the outermost outer cylinder is delayed, and the temperature rises temporarily in the element radial direction. Causes a large temperature gradient. When the engine load decreases and the exhaust gas temperature suddenly drops, the temperature near the center of the element immediately drops, but the temperature drop at the outermost periphery slows down. Large temperature gradients occur. When such a temperature gradient occurs, the filter plate 101
And the corrugated plate 103 undergo thermal expansion. However, since the flat plate and the corrugated plate near the center of the element are fixed to the outer cylinder via a long spiral distance, the restraining force is small near the center, and due to thermal expansion. A large displacement occurs between the layers. When such a temperature gradient is repeated during operation of the engine, in the case of a roll-shaped filter element, the so-called telescoping occurs in which the vicinity of the center protrudes due to the displacement between the layers, and the element is deformed and eventually damaged. There is. For this reason, in the particulate trapping device using a roll-shaped filter element in which a filter flat plate and a corrugated plate are laminated, there has been a problem that the durability of the filter element is reduced.

In the case of a filter element in the form of a roll, when one end of the passage is closed by sealing the filter plate by welding, one end of the filter element is connected to the flat plate and the corrugated plate before being wound into a roll. Although the flat plates can be welded in advance in the overlapped state, the other end surfaces of the filter elements cannot be welded unless they are formed into a roll shape. For this reason, the welding process for closing the passage end is extremely difficult, and there is a problem that the manufacturing cost of the filter element increases.

According to the present invention, when a filter element having a structure in which a filter flat plate made of a metal nonwoven fabric or the like and a metal corrugated plate are used is used, the deformation of the element due to the above-mentioned thermal expansion is effectively prevented, and It is an object of the present invention to provide a particulate collection device that can improve durability and is easy to manufacture.

[0009]

According to the first aspect of the present invention, a filter plate made of a nonwoven fabric made of metal and a metal corrugated plate are alternately laminated, and both ends of the filter plate are sandwiched between the corrugated plates. Between the filter flat plates alternately extending in the direction along the crest ridge line of the corrugated plate, alternately in the stacking direction, a passage whose one end is plugged and a passage whose other end is plugged. A particulate trapping device for an internal combustion engine including a filter laminate formed in the above, wherein a plurality of filter elements in which the filter laminate is folded in two along a crest ridgeline of the corrugated plate, Particulate of an internal combustion engine having a passage parallel to the axis of the outer cylinder and inserted in parallel into the outer cylinder so that the filter elements are in close contact with each other and the outer circumference of the filter element and the inner circumference of the outer cylinder. Collecting device is provided.

That is, in the first aspect of the present invention, the filter element is formed by a laminate in which filter flat plates made of metal nonwoven fabric and metal corrugated plates are alternately laminated. However, in the present invention, instead of winding the laminate into a roll, the laminate is folded in two to form a filter element, and a plurality of the filter elements are inserted in parallel into an outer cylinder to constitute a particulate collection device. I do. For example, as shown in FIG. 1, two filter elements each composed of a two-layered laminate may be inserted into the outer cylinder in the shape of a column to form a particulate collection device. As described above, since each filter element is formed into a folded shape, the filter flat plate and the corrugated plate of each element layer are connected to the inner peripheral surface of the outer cylinder at a shorter distance than when formed into a roll. become. For this reason, the flat plate and the corrugated plate are firmly held by the outer cylinder, and displacement or deformation of the filter element due to thermal expansion is prevented.

Further, as a result of forming the laminate into two folds,
Weld each passage before folding it in half except for the center layer.
It becomes possible to carry out the sealing, and the manufacture of the filter element becomes extremely easy. According to the invention as set forth in claim 2, a shaft having a cross-sectional shape having an arc portion is inserted into the folded portion of the filter laminate, and the filter laminate is folded along the arc portion of the shaft. A particulate collection device for an internal combustion engine according to claim 1, which is folded.

In other words, according to the second aspect of the present invention, the shaft is inserted into the two-folded portion of the filter element, so that the bending angle of the filter plate at the two-folded portion is prevented from increasing. Since the filter plate is made of a metal nonwoven fabric, the filter has low strength against bending, and easily breaks when the bending angle locally increases at the folded portion of the filter element. According to the present invention, it is possible to increase the bending angle by inserting a shaft having a cross-sectional shape including an arc portion into the two-fold portion of the filter element and gently bending the filter element along the arc portion (that is, locally increasing the bending angle). It prevents sharp bending. This prevents the strength of the folded part of the filter element from being reduced. The cross-sectional shape of the shaft body to be inserted may be a semicircle or a teardrop shape.

According to the third aspect of the present invention, at least two of the plurality of filter elements that come into contact with each other have an open end of the passage at the outermost periphery of the element at an end surface on a different side of the outer cylinder. A particulate collection device for an internal combustion engine according to claim 1, which is arranged to be located. That is, according to the third aspect of the present invention, the passages formed at the outermost periphery of the two filter elements that are in contact with each other have open ends in opposite directions. The exhaust gas flows into one element from a passage having an open end on the upstream side, passes through both outermost filter plates, flows into a passage having an open end on the downstream side of the other element, and is opened downstream. It flows out of the element from the end. Particulates in the exhaust gas are collected when the exhaust gas passes through the filter plate. For this reason, by locating the open ends of the passages adjacent to each other at the contact portions of the filter elements in opposite directions, the exhaust gas passes through the outermost filter flat plates of both elements, and the collection efficiency of the particulates is reduced. improves.

[0014]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a plan view showing the structure of a particulate collection device 1 of the present invention, and FIG.
It is sectional drawing which followed the -A line. FIG. 1 shows a configuration in which two filter elements 10a and 10b are inserted in parallel into a cylindrical outer cylinder 11 like a tom. The filter elements 10a and 10b of the present embodiment are formed as a laminate of a filter flat plate 5 made of a metal nonwoven fabric and a metal corrugated plate 7.

FIGS. 3A and 3B show filter element 1.
It is a schematic diagram explaining the structure of 0a, 10b. The filter elements 10a and 10b each include a plurality of filter flat plates 5 made of a metal non-woven fabric and a plurality of metal corrugated plates 7.
It is formed by laminating so that the flat plates 5 are located at both ends (FIG. 3A), and folding this laminate through a shaft 9 and a metal corrugated plate 7 (FIG. 3B). )).

As a result, in each layer of the laminate folded in two, the filter flat plates 5 are held apart from each other by the corrugated plate 7, and between the respective layers along the crest ridge line of the corrugated plate 7 (FIG. 3 (A) ( B)
At right angles to the plane of the drawing)
Is formed. The width of the filter flat plate 5 in each layer is larger than the width of the corrugated plate 7, and the flat plate 5 projects out of the corrugated plate 7 at both ends of the passage 3. In the present embodiment, the open end of the passage is closed (plugged) by crimping electric welding of the flat plate portions protruding to both sides of the laminate. In this case, by adhering the ends of the different flat plates on both sides of the laminate, only one end of each layer is closed, and the passages of which the ends on the different sides are closed alternately in each layer. To be placed. That is, in the example of FIG. 3, for example, in the laminate of FIG. 3, the ends of the flat plates 5 of the layers indicated by III and II in FIG. And III, II and I are welded to each other at the end face of the laminate located on the back side of the drawing. Further, the flat plates of the layer I are welded to each other at the end faces located on the front side of the drawing after being folded in two.
The flat plates of layers II to IV may be capped before folding the laminate into two.

FIG. 4 shows the end face of the laminate after the sealing. As described above, the ends of the flat plate were fastened alternately at both ends of the laminate. As a result, the end surface of the laminate was fastened by a passage layer having an open end and a flat welded portion indicated by line B in FIG. The layers of the passage having a closed end are formed alternately.
The passage having an open end on the end face side shown in FIG. 4 is closed on the opposite end face.

In the present embodiment, the two filter elements 10a and 10b of the same shape formed as described above are attached to a cylindrical outer cylinder 11 made of metal and having both ends opened, and the outer peripheral surfaces of the filter elements 10a and 10b, and The particulate filter 1 is formed by inserting the filter elements 10a and 10b so that the outer peripheral surfaces thereof and the inner peripheral surface of the outer cylinder 11 are in close contact with each other. Thereby, the particulate filter 1
Of the two-fold filter element 10
a and 10b are arranged like a tom as shown in FIG. As shown in FIG. 2, in each of the filter elements 10a and 10b, a passage 3 whose one end is closed and a passage 3 whose other end is closed are alternately arranged for each layer in parallel with the axis of the outer cylinder 11. Will be formed.

By connecting the particulate filter 1 of FIG. 1 to an exhaust pipe, exhaust gas flows into the filter elements 10a and 10b from the passage 3 having an open end on the upstream side, and passes through the filter plate 5 separating the passages. And flows into the passage 3 having an open end on the downstream side, and flows out of the filter elements 10a and 10b from the downstream open end of the passage 3.
Since the filter plate 5 is made of a metal nonwoven fabric, fine particles (particulates) in the exhaust gas are collected by the filter plate 5 when the exhaust gas passes through the filter plate 5.

The particulate filter 1 of the present embodiment
Is a filter element 1 having a shape obtained by folding a laminate including a filter flat plate 5 and a corrugated plate 7 into two as shown in FIG.
By adopting a configuration in which 0a and 10b are inserted into the outer cylinder 11 without any gap, the durability of the filter element is greatly improved as compared with the case where a conventional roll-shaped filter element (FIG. 10) is used.

As described above, in the conventional roll-shaped filter element (FIG. 10), the filter plate 101 and the corrugated plate 1 are used.
Numeral 03 indicates that each layer of the filter extends spirally from the contact portion with the inner periphery of the outer cylinder toward the center. For this reason, the distance from the contact surface with the outer cylinder becomes long near the center of the filter, and the filter flat plate 101 and the corrugated plate 103
Is small, and the flat plate and the corrugated plate are held only by mutual friction due to the tightening force when wound into a roll. For this reason, if thermal expansion and contraction due to changes in the exhaust gas temperature are repeated, axial displacement occurs between the layers, and telescoping occurs in which the vicinity of the center of the filter element protrudes in the axial direction.

On the other hand, in the present embodiment, the filter flat plate 5 and the corrugated plate 7 of each layer are fixed to the inner peripheral surface of the outer cylinder 11 at the two-folded ends (portions indicated by C in FIG. 1). Yes,
Each part of the filter plate 5 and the corrugated plate 7 is a short distance from the
Will be connected to For this reason, the filter flat plate 5 and the corrugated plate 7 of each layer are firmly held by the outer cylinder, and even if a history of thermal expansion due to a temperature change occurs, deformation such as telescoping is unlikely to occur. The durability of the filter element is greatly improved.

Further, in the conventional roll-shaped filter element, the flat plate-welded portion of each layer for sealing is formed by a continuous one-piece.
Due to the number of spiral lines, when performing welding, it is necessary to continuously perform welding over a long distance from the welding start point, and there has been a problem that welding requires a long time. In order to prevent this, it is theoretically possible to divide the single spiral welding wire into a plurality of sections and perform welding in parallel in each section separately. There are problems such as the occurrence of wrinkles at the connection portions of the sections, which is actually difficult. In addition, as a result of being formed in a roll shape, at one end of the filter element, flat plate welding and sealing can be performed before winding in a roll shape, but welding at the other end portion is performed after winding in a roll shape. If not, it cannot be caught. For this reason, in the case of the conventional roll-shaped filter element, an extremely long time is required for the welding process, which causes an increase in manufacturing cost.

On the other hand, in the filter element of this embodiment, the welded portion of the flat plate 3 is divided for each layer.
Each is a short line starting from the outer periphery of the filter element and ending at the outer periphery. For this reason, in the filter element of the present embodiment, it is possible to process a plurality of welded portions in parallel. In addition, since the filter element has a two-fold structure, the welding process on both sides of the element can be performed at the same time before the two-fold process, except for the welded portion at the center of the element. For this reason, in the filter element of the present embodiment, it is possible to greatly reduce the time required for the welding process as compared with the related art.

Next, the shaft 9 inserted into the folded part of the filter element of FIG. 1 will be described. In the filter element of the present embodiment, a metal nonwoven fabric is used as a filter plate. This metal nonwoven fabric is extremely weak in bending, and tends to break easily when the bending angle (the angle indicated by α in FIG. 5 as the bending angle in this specification) is large. Therefore, when a filter element is formed by folding a laminate of a metal nonwoven fabric filter flat plate and a corrugated plate into two as in the present embodiment, it is necessary to directly bend without inserting a shaft into the two-fold portion. The bending angle of the filter plate of the innermost layer is locally 1
At 80 degrees, the filter plate may be broken. If a break occurs in the two-folded portion, this portion becomes a starting point during manufacture and use of the filter element, and the break grows to cause a problem that the filter element is damaged.

In the present embodiment, a shaft body having a cross-sectional shape including an arc portion is inserted into the folded portion of the filter element, and the innermost filter plate is bent along the arc portion. Is prevented from occurring. FIG. 6 (A) shows the bending state of the innermost filter plate 5 when the bending is performed directly without passing through the shaft, and FIG. 6 (B) shows the case where a shaft having a circular cross section is used. 5A and 5B are diagrams respectively showing states of bending of the innermost filter plate.

As shown in FIG. 6 (A), when the shaft body is not used, the bending angle α of the filter plate is 1 at the folded portion.
At 80 degrees, the filter plate is likely to break at this point. On the other hand, as shown in FIG. 6B, when the bending is performed with the shaft 9 having a circular cross section inserted into the two-folded portion, the bent portion of the innermost filter plate is formed into an arc of the cross section of the shaft. Therefore, a large bending angle does not occur locally because the bending is performed along a large radius. This prevents the filter plate from being damaged.

FIG. 6 (C) is a view similar to FIG. 6 (B) showing a case where a shaft having a teardrop-shaped cross section is used as the shaft body 9. The innermost filter flat plate is welded at its end to seal the passage 3 after the filter element is folded in two. On the welding side, the shaft 9 and the filter flat plate 5 need to be in close contact with each other to prevent leakage of exhaust gas. . Therefore, on the welding side, the filter plate 5 is bent at 90 degrees at the end of winding of the shaft 9 of the filter plate 5 (portion indicated by E in FIG. 6B). On the other hand, in order to reduce the possibility of breakage of the filter plate 5, it is preferable to set the bending angle as small as possible. Therefore, in FIG. 6C, the bending angle of the filter plate 5 at the end of winding of the shaft 9 is greatly reduced by using the shaft 9 having a teardrop-shaped cross section. In this case, since the innermost filter flat plate 5 is gently bent along the arc shape of the head of the cross section of the teardrop of the shaft 9 in the folded portion, a shaft having a circular cross section (FIG. 6 (B)) is used. As in the case where the filter is folded, it is possible to prevent a large bending angle from being locally generated on the filter plate at the two-fold portion.
Further, since the filter plate 5 ends to be wound at the tail of the teardrop cross section of the shaft 9, even if the shaft 9 and the filter plate 5 are brought into close contact with each other at the end of winding and the end of the filter plate is welded, the winding is performed. The bending angle at the end can be reduced. As a result, the possibility of breakage of the filter plate due to bending at the end of winding is greatly reduced.

FIG. 7 is a view showing another embodiment different from FIG. 6C in which a shaft having a teardrop-shaped cross section is used. In FIG. 6 (C), the shaft 9 has a uniform cross-sectional shape like a droplet over its entire length. However, as shown in FIG. 7 (A), in this embodiment, the shaft 9 has one end portion. FIG. 6C is different from FIG. 6C in that only the vicinity 9a is formed in a droplet-shaped cross section, and the other portion 9b is formed in a semicircular cross section.

When a shaft having a uniform teardrop cross-sectional shape is used as shown in FIG. 6C, the bending angle of the filter plate at the end of winding of the shaft can be reduced. A portion where no corrugated sheet exists between the filter plates near the tail portion of the teardrop cross-section is generated. That is, when a shaft body having a uniform teardrop cross-sectional shape is used, as shown in FIG. 7 (C), the corrugated plate 7 supporting the filter plates 5 in a separated state comes into contact with the tail end of the droplet-like cross section. 7 (C), the filter plate 5 is not supported by the surface of the shaft nor by the corrugated plate 7, and the filter plate 5 in this portion is not supported.
Is easily damaged. Further, when thermal expansion occurs in the corrugated plate 7 in a state where the end of the tearful cross section and the end of the corrugated plate are in contact with each other, the end of the corrugated plate 7 rides on the tail of the tearful cross section and compresses the filter plate from the inside. In some cases.

In this embodiment, as shown in FIG. 7 (B), the shaft 9 is inserted so that the teardrop-shaped cross section 9a is on the side where the end of the filter plate 5 is welded after being folded in two. Folding and welding of the filter plate 5 are performed.
Thus, as in the case of FIG. 6C, the bending angle of the welded portion of the filter plate 5 at the end of the winding of the shaft 9 can be reduced. Further, in the present embodiment, the corrugated plate 7 reaches near the center of the shaft body in the semicircular cross-sectional shape portion. A portion where the filter plate 7 is not supported between the arc portion of the shaft 9 and the portion in contact with the corrugated plate 7 as in the case of using a shaft having a uniform tear-like cross section is provided. Will not occur. Also, the corrugated plate 7 comes into contact with the plane of the semicircular cross section of the shaft body 9 at right angles,
Since the movement (riding) of the corrugated sheet 7 due to thermal expansion or the like is prevented, the durability of the filter is further improved.

Next, the direction in which the filter elements 10a and 10b of the present embodiment are inserted into the outer cylinder 11 will be described with reference to FIGS. In the filter elements 10a and 10b of the present embodiment, since the filter plate 5 is arranged on the outermost layer, the elements 10a and 10b are
In this case, a portion where the outermost filter plate of the element 10a and the outermost filter plate of the element 10b are in close contact with each other (a portion indicated by a line D in FIG. 1) is formed. In the present embodiment, as shown in FIG. 2, the filter elements 10 a and 10 b are inserted so that the openings of the outermost passages 3 are located on the opposite end faces of the outer cylinder 11. That is, in the present embodiment, two filter elements 10a and 10b having the same shape are manufactured and inserted into the outer cylinder 11 so as to be opposite to each other.
Thereby, the contact portion of the filter element (FIG. 1, D)
In this case, the outermost layer passages (FIGS. 2, 3a, 3b) of each filter element are opened in opposite directions with respect to the outermost filter plates 5a, 5b of both elements. As a result, the exhaust gas flowing into the passage from the open end 31b of one passage (for example, 3b) always passes through the filter plates 5b and 5a and then flows into the other passage 3a.
Since it flows out from the open end 31a to the downstream side, the filter plates 5a and 5b of the outermost layer of the filter elements 10a and 10b can be effectively used as a filter for collecting particulates.

Although the embodiment of the present invention has been described with reference to FIGS. 1 to 7, the present invention is not limited to the above embodiment. For example, in the embodiment of FIG. 1, the outer cylinder 11 into which the filter elements 10a and 10b are inserted has a cylindrical shape. However, the cross-sectional shape of the outer cylinder 11 does not need to be circular, Any other shape may be used as long as it comes into contact with the inner circumference of the cylinder 11 without forming a gap. For example, as shown in FIG. 8, a configuration in which two filter elements 10a and 10b are inserted like a tom in an outer cylinder 11 having an elliptical or elliptical cross-sectional shape is also possible.

Further, in each of the above embodiments, the configuration in which two filter elements are inserted into the outer cylinder 11 is exemplified. However, the particulate collection device 1 is configured by inserting two or more filter elements. It is also possible.
FIG. 9 shows three filter elements 10a, 10b, 10
An example is shown in which a particulate collection device is constructed by inserting the c into the outer cylinder 11 having a circular cross section. In this case, since a gap is formed between the filter elements in the outer cylinder 11, it is necessary to provide a shaft 13 for filling the gap in order to prevent exhaust gas from flowing through this section.

[0035]

According to the invention described in each claim, when a particulate trapping device is constituted by using a filter element having a structure in which a filter flat plate and a corrugated plate are laminated, deformation due to thermal expansion is effectively prevented. To improve the durability of the filter element, and has a common effect that the filter element can be easily manufactured.

According to the second aspect of the present invention, the bending angle of the filter flat plate can be reduced to an allowable range. This has the effect that the durability of the filter element can be further improved.
According to the third aspect of the present invention, it is possible to efficiently use a filter plate when configuring a particulate collection device using a plurality of filter elements. Thus, there is an effect that the collection efficiency of the particulate collection device can be improved.

[Brief description of the drawings]

FIG. 1 is a plan view showing the structure of an embodiment of a particulate collection device according to the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a schematic diagram illustrating a structure of a filter element of the particulate collection device of FIG.

FIG. 4 is a view schematically showing an end face of a filter element of the particulate collection device of FIG. 1;

FIG. 5 is a diagram showing a definition of a bending angle of a filter plate.

FIG. 6 is a diagram schematically illustrating a change in a filter plate bending angle when a shaft is inserted into a bent portion of a filter element.

FIG. 7 is a diagram illustrating an effect when a shaft having a teardrop-shaped cross section is used.

FIG. 8 is a diagram illustrating a configuration of an embodiment different from FIG. 1 of the particulate trapping device.

FIG. 9 is a diagram illustrating a configuration of an embodiment of the particulate collection device different from FIGS. 1 and 8;

FIG. 10 is a diagram illustrating a configuration of a particulate trapping device using a conventional roll-shaped filter element.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Particulate collection device 3 ... Passage 5 ... Filter plate 7 ... Metal corrugated plate 9 ... Shaft 10a, 10b ... Filter element 11 ... Outer cylinder

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yoshimitsu Henda 1 Toyota Town, Toyota City, Aichi Prefecture Toyota Motor Corporation (72) Inventor Hiromichi Yanagihara 1 Toyota Town, Toyota City, Aichi Prefecture Toyota Motor Corporation ( 72) Inventor Toshihisa Sugiyama 1-Toyota-cho, Toyota-shi, Aichi F-term in Toyota Motor Corporation (reference) 3G090 AA01 4D019 AA01 BA02 BB03 BB10 CA02 CA03 CB01 4D058 JA12 JA42 JB03 JB25 JB39 KA03 KA08 KA11 SA08

Claims (3)

[Claims] 1. A filter plate made of a metal nonwoven fabric and a metal corrugated plate are alternately laminated, and both ends of the filter plate are alternately fastened with the corrugated plate interposed therebetween, and the filter plate is interposed between the filter plates. Particulate trapping of an internal combustion engine provided with a filter stack in which a passage whose one end is plugged and a passage whose other end is plugged are alternately formed in the stacking direction and extend in the direction along the crest ridgeline of the corrugated plate. A filter device, wherein a plurality of filter elements obtained by folding the filter laminate in half along the crest ridge line of the corrugated plate, the passage of the filter element is parallel to the outer cylinder axis, and the filter elements mutually, and A particulate collection device for an internal combustion engine, which is inserted in parallel into an outer cylinder so that an outer periphery of a filter element and an inner periphery of an outer cylinder are in close contact with each other. 2. A filter according to claim 1, wherein a shaft having a cross-sectional shape having an arc portion is inserted into the folded portion of the filter laminate, and the filter laminate is folded in two along the arc portion of the shaft. 3. The particulate trapping device for an internal combustion engine according to claim 1. 3. The at least two filter elements in contact with each other among the plurality of filter elements,
2. The particulate collection device for an internal combustion engine according to claim 1, wherein the open ends of the passages on the outermost periphery of the element are arranged on different end surfaces of the outer cylinder.