JPH04342816A - Exhaust filter for internal combustion engine - Google Patents
Exhaust filter for internal combustion engineInfo
- Publication number
- JPH04342816A JPH04342816A JP3115862A JP11586291A JPH04342816A JP H04342816 A JPH04342816 A JP H04342816A JP 3115862 A JP3115862 A JP 3115862A JP 11586291 A JP11586291 A JP 11586291A JP H04342816 A JPH04342816 A JP H04342816A
- Authority
- JP
- Japan
- Prior art keywords
- exhaust
- lattice
- openings
- filter
- filter element
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000002485 combustion reaction Methods 0.000 title claims description 6
- 239000002184 metal Substances 0.000 claims abstract description 32
- 239000002245 particle Substances 0.000 abstract description 3
- 230000002708 enhancing effect Effects 0.000 abstract 1
- 239000011859 microparticle Substances 0.000 abstract 1
- 239000000919 ceramic Substances 0.000 description 9
- 239000006260 foam Substances 0.000 description 5
- 239000003054 catalyst Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- QNRATNLHPGXHMA-XZHTYLCXSA-N (r)-(6-ethoxyquinolin-4-yl)-[(2s,4s,5r)-5-ethyl-1-azabicyclo[2.2.2]octan-2-yl]methanol;hydrochloride Chemical compound Cl.C([C@H]([C@H](C1)CC)C2)CN1[C@@H]2[C@H](O)C1=CC=NC2=CC=C(OCC)C=C21 QNRATNLHPGXHMA-XZHTYLCXSA-N 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 230000008929 regeneration Effects 0.000 description 3
- 238000011069 regeneration method Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000010419 fine particle Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Landscapes
- Processes For Solid Components From Exhaust (AREA)
- Filtering Materials (AREA)
- Filtering Of Dispersed Particles In Gases (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】この発明は、内燃機関、特にディ
ーゼル機関で問題となるカーボン等の排気微粒子を捕集
除去するための排気フィルタに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust filter for collecting and removing exhaust particulates such as carbon, which are a problem in internal combustion engines, particularly diesel engines.
【０００２】0002
【従来の技術】ディーゼル機関で問題となるカーボン等
の排気微粒子を、排気系に介装した排気フィルタにて捕
集除去することは従来から考えられており、種々の形式
の排気フィルタが既に提案されている。[Prior Art] It has long been considered that exhaust particulates such as carbon, which are a problem in diesel engines, can be collected and removed using an exhaust filter installed in the exhaust system, and various types of exhaust filters have already been proposed. has been done.
【０００３】この排気フィルタの代表的なものは、いわ
ゆる目封じ型フィルタに代表される濾過捕集形式のもの
である。上記目封じ型フィルタは、例えば特開昭５６−
１２４４１７号公報に示されているように、セラミック
ス製のブロックに排気流方向に沿った多数の微細な流路
を形成し、かつ各流路の端部を交互にセラミックスにて
閉塞した構成であって、流路間のセラミックスの隔壁を
排気が通過することにより、排気微粒子を濾過捕集する
ようにしたものである。A typical exhaust filter is of a filtration and collection type, typified by a so-called plugged filter. The above-mentioned sealed filter is, for example, JP-A-56-
As shown in Japanese Patent No. 124417, a large number of fine channels are formed in a ceramic block along the exhaust flow direction, and the ends of each channel are alternately closed with ceramics. The exhaust gas is passed through a ceramic partition wall between the flow channels to filter and collect exhaust particulates.
【０００４】この濾過捕集形式のものでは、非常に高い
捕集効率が得られる反面、排気微粒子を過剰捕集し易く
、微粒子捕集量がフィルタの焼損限界を越え易い。つま
り、バーナー等を用いた強制再生や排気熱による再生の
時期が多少でも遅れたような場合に、多量の排気微粒子
が急激に燃焼し、フィルタの焼損を招く可能性がある。
しかも焼却除去が不可能なＡｓｈ成分（オイル添加剤の
酸化物等）までも捕集してしまい、いずれは目詰まり状
態に至る可能性がある。[0004] Although this type of filtration and collection can achieve very high collection efficiency, it tends to collect excessive exhaust particulates, and the amount of collected particulates tends to exceed the burnout limit of the filter. In other words, if the timing of forced regeneration using a burner or the like or regeneration using exhaust heat is even slightly delayed, a large amount of exhaust particulates will suddenly burn, potentially causing burnout of the filter. Furthermore, Ash components (oxides of oil additives, etc.) that cannot be removed by incineration are also collected, which may eventually lead to clogging.
【０００５】そこで、この濾過捕集形式のものに代えて
、付着捕集形式の排気フィルタが提案されている。その
代表例としては、特開昭６２−４５３０９号公報に見ら
れるようなセラミックスの三次元多孔体いわゆるセラミ
ックスフォームをフィルタエレメントとしたものが知ら
れている。このセラミックスフォームからなる付着捕集
形式のものでは、連続気泡状に形成される複雑かつ微細
な流路を排気ガスが通流する際に、流路壁面に排気微粒
子が付着して捕集されるようになっている。そのため、
過剰捕集は生じにくく、かつＡｓｈ成分による目詰まり
も生じにくい。[0005] Therefore, instead of this filtration and collection type exhaust filter, an adhesion collection type exhaust filter has been proposed. As a typical example, a filter element using a three-dimensional porous ceramic material, so-called ceramic foam, as shown in Japanese Patent Laid-Open No. 62-45309, is known. In this adhesion collection type made of ceramic foam, when exhaust gas flows through a complex and fine flow path formed in the shape of open cells, exhaust particulates adhere to the wall of the flow path and are collected. It looks like this. Therefore,
Excessive collection is less likely to occur, and clogging due to Ash components is less likely to occur.
【０００６】[0006]
【発明が解決しようとする課題】しかしながら、上記の
ようにセラミックスフォームを用いた付着捕集形式のも
のでは、捕集密度が排気流方向で不均一になり易く、排
気の入口側となる表面にのみ多量の排気微粒子がたまっ
てしまうという不具合がある。そのため、フィルタエレ
メント全体を排気微粒子の捕集に有効利用することが難
しく、下流側部分にあまり排気微粒子が存在せず十分な
余裕がある段階でフィルタエレメントの再生が必要とな
る。換言すれば、必要な排気微粒子の捕集容量に対し、
フィルタエレメントが大型化し易い。しかも、入口側表
面での捕集の進行に伴って圧力損失が増大し易い。[Problems to be Solved by the Invention] However, as described above, in the adhesion collection type using ceramic foam, the collection density tends to be uneven in the exhaust flow direction, and the surface on the exhaust inlet side tends to be uneven. However, there is a problem in that a large amount of exhaust particulates accumulate. Therefore, it is difficult to effectively utilize the entire filter element for collecting exhaust particulates, and it is necessary to regenerate the filter element at a stage when there are not many exhaust particulates in the downstream portion and there is sufficient room. In other words, for the required collection capacity of exhaust particulates,
The filter element tends to be large. Moreover, as the collection progresses on the inlet side surface, pressure loss tends to increase.
【０００７】また、付着捕集形式のものではフィルタ全
体としての捕集効率が一般に低く、かつ機関の加速時等
に排気微粒子のブローオフが生じ易いという欠点もある
。[0007]Furthermore, the adhering type filter generally has a low collection efficiency as a whole, and also has the disadvantage that exhaust particulates are likely to blow off when the engine is accelerated.
【０００８】[0008]
【課題を解決するための手段】そこで、この発明に係る
内燃機関の排気フィルタは、線部で区切られた略矩形の
開口部が多数形成されてなる格子状金属板を、上記開口
部の対角線方向に交互にずらして多数枚積層し、かつ上
記開口部の対角線方向に略沿って排気が通流するように
、この格子状金属板の積層体を筒状のフレーム内に収容
したことを特徴としている。[Means for Solving the Problems] Therefore, in the exhaust filter for an internal combustion engine according to the present invention, a lattice-shaped metal plate formed with a large number of substantially rectangular openings separated by lines is arranged so that the diagonal lines of the openings A laminate of lattice-shaped metal plates is housed in a cylindrical frame such that a large number of lattice-shaped metal plates are laminated with alternating directions and the exhaust gas flows approximately along the diagonal direction of the opening. It is said that
【０００９】[0009]
【作用】上記構成では、格子状金属板の積層体の端面に
排気が衝突し、概略的には各金属板と平行に排気が通流
しようとする。ここで、微視的に見れば、各開口部の対
角線に略沿って流入した排気は、各開口部の隅部に衝突
し、該隅部に排気微粒子が捕集されるとともに、上下に
積層した他の開口部に順次拡散していく。このとき、各
隅部における流路はクサビ状に縮小しているため、一種
のクサビ効果によって排気微粒子が付着捕集され易い。
また、排気流は、各開口部を移動する間に、縮小，拡散
を繰り返し、これにより順次下流側の開口部の隅部に排
気微粒子が捕集されていく。[Operation] In the above structure, the exhaust gas collides with the end faces of the stack of lattice-shaped metal plates, and the exhaust gas tends to flow approximately parallel to each metal plate. Here, from a microscopic perspective, the exhaust gas that flows in roughly along the diagonal line of each opening collides with the corner of each opening, and the exhaust particulates are collected at the corner and stacked vertically. It then spreads sequentially to other openings. At this time, since the flow path at each corner is reduced in the shape of a wedge, exhaust particulates are likely to be attached and collected due to a kind of wedge effect. In addition, the exhaust flow repeatedly contracts and diffuses while moving through each opening, and as a result, exhaust particulates are successively collected at the corners of the openings on the downstream side.
【００１０】0010
【実施例】以下、この発明の一実施例を図面に基づいて
詳細に説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings.
【００１１】図４は、この発明に係る排気フィルタの全
体的構成を示す断面図であり、断面略矩形の筒状をなす
ケーシング１の一端に角錐形をなす入口部１ａが設けら
れ、かつ排気入口管２が接続されている。また他端に角
錐形をなす出口部１ｂが設けられ、かつ排気出口管３が
接続されている。そして、ケーシング１内部に、緩衝材
４を介して略矩形のフィルタエレメント５が収容されて
いる。FIG. 4 is a sectional view showing the overall structure of the exhaust filter according to the present invention, in which a pyramid-shaped inlet portion 1a is provided at one end of a cylindrical casing 1 with a substantially rectangular cross section, and An inlet pipe 2 is connected. Further, a pyramid-shaped outlet portion 1b is provided at the other end, and an exhaust outlet pipe 3 is connected thereto. A substantially rectangular filter element 5 is housed inside the casing 1 with a buffer material 4 in between.
【００１２】上記フィルタエレメント５は、図３に示す
ように、１ｍｍ程度の板厚を有する多数の格子状金属板
６を上下に積層し、この積層体を略矩形の筒状をなす金
属製フレーム７内に収容するとともに、例えばスポット
溶接等で一体に固定した構成となっている。As shown in FIG. 3, the filter element 5 has a plurality of lattice-shaped metal plates 6 each having a thickness of about 1 mm stacked one above the other, and this laminate is attached to a metal frame having a substantially rectangular cylindrical shape. 7 and fixed together by, for example, spot welding.
【００１３】各格子状金属板６は、例えば図５に示すよ
うに、平坦な金属板からなる母材６´に多数のスリット
８を交互に形成し、これをスリット８と直交する矢印Ａ
−Ａ方向へ引き伸ばしたものであり、これによって、図
１に詳示するように、細い線部９によって区切られた菱
形の多数の開口部１０を有する菱形の格子状に形成され
ている。また積層される多数の格子状金属板６は、いず
れも同一形状，同一寸法の格子状に形成されている。
尚、上記開口部１０の寸法は適宜に設定すれば良いが、
例えば、格子間距離Ｓが５ｍｍ程度、各辺のなす角α，
βが、それぞれ６０゜，１２０゜程度に設定されている
。また、この格子状金属板６は、個々にあるいはフレー
ム７と組み立てた状態において触媒を含むセラミックス
のコーティングがなされ、触媒を担持した状態となって
いる。Each lattice-shaped metal plate 6 has a large number of slits 8 alternately formed in a base material 6' made of a flat metal plate, as shown in FIG.
-A direction, thereby forming a rhombic lattice shape having a large number of rhombic openings 10 separated by thin line portions 9, as shown in detail in FIG. Further, the large number of stacked lattice-shaped metal plates 6 are all formed in a lattice-like shape with the same shape and size. Incidentally, the dimensions of the opening 10 may be set appropriately;
For example, when the interlattice distance S is about 5 mm, the angle α between each side is
β is set to about 60° and 120°, respectively. Further, the lattice-shaped metal plate 6 is coated with ceramics containing a catalyst, either individually or when assembled with the frame 7, so that the metal plate 6 supports the catalyst.
【００１４】そして、各格子状金属板６を積層する際に
は、図１に示すように、隣接する格子状金属板６同士で
格子の線部９が重なることのないように、各格子状金属
板６を開口部１０の対角線方向に交互にずらしてある。
具体的には、格子間距離Ｓの１／２づつずらして重ねて
ある。When stacking each lattice-shaped metal plate 6, as shown in FIG. The metal plates 6 are alternately shifted in the diagonal direction of the opening 10. Specifically, they are overlapped with a shift of 1/2 of the inter-lattice distance S.
【００１５】また、上記格子状金属板６は、開口部１０
の長手方向の対角線が排気流入方向と平行となるような
向きでフレーム７内に収容されている。[0015] Furthermore, the lattice-shaped metal plate 6 has an opening 10
It is housed in the frame 7 in such a direction that its longitudinal diagonal line is parallel to the exhaust gas inflow direction.
【００１６】上記実施例の構成においては、内燃機関を
出た排気が図３の矢印Ｇのようにフィルタエレメント５
を通過する。つまり、格子状金属板６の面と平行にかつ
開口部１０の長手方向の対角線に沿って排気が流入する
。この排気はフィルタエレメント５の端面に位置する多
数の開口部１０に流入するが、同一平面で見た場合に各
開口部１０の先端部はクサビ状に閉じているので、同一
平面に沿って排気が流れることはできない。つまり、各
開口部１０に流入した排気は、クサビ状に閉じた線部９
に衝突し、図２の矢印Ｇのように、上面側もしくは下面
側に位置する次段の開口部１０に分流，拡散していく。
そして、このように分流した排気は、やはりその開口部
１０の先端部に衝突し、上面側もしくは下面側に位置す
るさらに下流の開口部１０に分流，拡散していく。
つまり、次々と衝突，分流，拡散を繰り返しながら下流
へ流れ、最終的にフィルタエレメント５の他端に達する
ことになる。In the configuration of the above embodiment, the exhaust gas exiting the internal combustion engine passes through the filter element 5 as indicated by arrow G in FIG.
pass through. That is, the exhaust gas flows in parallel to the surface of the lattice-shaped metal plate 6 and along diagonal lines in the longitudinal direction of the opening 10 . This exhaust gas flows into a large number of openings 10 located on the end face of the filter element 5, but since the tip of each opening 10 is closed in a wedge shape when viewed from the same plane, the exhaust gas flows along the same plane. cannot flow. In other words, the exhaust gas flowing into each opening 10 is directed to the wedge-shaped closed wire portion 9.
The water collides with the water, and as indicated by arrow G in FIG. 2, the water is divided and diffused into the next stage opening 10 located on the upper surface side or the lower surface side. The thus divided exhaust gas also collides with the tip of the opening 10, and is divided and diffused to the further downstream opening 10 located on the upper surface side or the lower surface side. In other words, the water flows downstream while repeatedly colliding, dividing, and diffusing one after another, and finally reaches the other end of the filter element 5.
【００１７】従って、排気微粒子は、開口部１０を囲む
線部９の表面、特に排気が衝突する開口部１０の隅部１
１に順次付着捕集されていく。この隅部１１は、クサビ
状に流路が狭まっているため、一種のクサビ効果によっ
て排気微粒子が確実に捕集されるようになる。しかも排
気が多数の開口部１０の間で拡散，衝突を複雑に繰り返
すことから、フィルタ全体として非常に高い捕集効率を
確保できる。Therefore, the exhaust particles are exposed to the surface of the line portion 9 surrounding the opening 10, especially the corner 1 of the opening 10 where the exhaust collides.
1 and are successively collected. Since this corner 11 has a narrow wedge-shaped flow path, exhaust particulates are reliably collected by a kind of wedge effect. Moreover, since the exhaust gas diffuses and collides repeatedly between the many openings 10 in a complicated manner, a very high collection efficiency can be ensured as a whole of the filter.
【００１８】また、各開口部１０の寸法自体は比較的大
きなものであるから、フィルタエレメント５の入口側端
部のみで局部的な捕集が行われることはなく、セラミッ
クスフォーム等に比して比較的各部均一に排気微粒子が
捕集されるようになる。そのため、表面での局部的な捕
集による圧力損失の増大が回避できる。尚、上記のよう
に格子状金属板６を積層した構成では、各部に形成され
る複雑な流路を同一パターンで非常に均一に得ることが
でき、従って排気流の偏りや捕集の偏りが抑制され、各
部の微粒子の分布を一層均一にできる。Furthermore, since the dimensions of each opening 10 are relatively large, local collection is not performed only at the inlet end of the filter element 5, and compared to ceramic foam, etc. Exhaust particles are collected relatively uniformly in all parts. Therefore, an increase in pressure loss due to local collection on the surface can be avoided. In addition, in the structure in which the lattice-shaped metal plates 6 are laminated as described above, it is possible to obtain the complicated flow paths formed in each part in the same pattern in a very uniform manner, and therefore the bias in the exhaust flow and the collection are prevented. The distribution of fine particles in each part can be made more uniform.
【００１９】そして、このように比較的均一に排気微粒
子の捕集が進行することから、機関を急加速したような
場合に排気微粒子のブローオフが生じにくい。また、仮
に微粒子堆積量が大となる入口側部分で多少のブローオ
フが生じたとしても、上述した捕集作用により下流側で
再度捕集され易く、外部へ黒煙となって排出されること
がない。Since the exhaust particulates are collected relatively uniformly in this manner, blow-off of the exhaust particulates is less likely to occur when the engine is suddenly accelerated. In addition, even if some blow-off occurs at the inlet side where the amount of fine particles accumulated is large, the above-mentioned collection action makes it easy for them to be collected again on the downstream side, preventing them from being emitted outside as black smoke. do not have.
【００２０】尚、上記実施例では、格子状金属板６表面
に触媒をコーティングしてあるが、上記のように排気の
流動が複雑となり、線部９に繰り返し衝突するため、触
媒との接触効率も良好となって触媒作用による再生能力
やＣＯ、ＨＣ等に対する排気浄化作用が向上する。In the above embodiment, the surface of the lattice metal plate 6 is coated with a catalyst, but as mentioned above, the flow of exhaust gas becomes complicated and it repeatedly collides with the wire portions 9, so that the contact efficiency with the catalyst is reduced. As a result, the regeneration ability due to catalytic action and the exhaust gas purification effect on CO, HC, etc. are improved.
【００２１】また上記構成では、フィルタエレメント５
全体が金属製であるため、熱容量が小さく、昇温特性に
優れたものとなる。Furthermore, in the above configuration, the filter element 5
Since the entire device is made of metal, it has a small heat capacity and excellent temperature rise characteristics.
【００２２】以上、この発明の一実施例を説明したが、
この発明は上記実施例に限定されるものではない。例え
ば、上記実施例では、開口部１０を菱形としてあるが、
正方形あるいは長方形のような格子形状も可能である。
また、このような開口部１０を平坦な金属板から打ち抜
いて格子状金属板６を構成することもできる。One embodiment of the present invention has been described above, but
This invention is not limited to the above embodiments. For example, in the above embodiment, the opening 10 is rhombic, but
Grid shapes such as squares or rectangles are also possible. Further, the lattice-shaped metal plate 6 can also be constructed by punching out such openings 10 from a flat metal plate.
【００２３】[0023]
【発明の効果】以上の説明で明らかなように、この発明
に係る内燃機関の排気フィルタにおいては、格子状金属
板を交互にずらして多数積層することによって、略矩形
の開口部が連続してなる複雑かつ均一な流路を形成する
ようにしたので、付着捕集でありながらも全体として非
常に高い捕集効率を確保できる。特に、流路が狭められ
る開口部の隅部を利用して確実な捕集が可能となる。ま
た、セラミックスフォームからなるフィルタに比して入
口側表面での局部的な捕集が抑制され、フィルタエレメ
ント全体を有効利用した形で捕集を行うことができる。
従って、外部へのブローオフが生じにくくなるとともに
、局部的な捕集による圧力損失の増大を回避できる。Effects of the Invention As is clear from the above description, in the exhaust filter for an internal combustion engine according to the present invention, by stacking a large number of lattice-shaped metal plates with alternating shifts, substantially rectangular openings are formed continuously. Since a complex and uniform flow path is formed, a very high overall collection efficiency can be ensured even though the collection is based on adhesion. In particular, reliable collection is possible by utilizing the corner of the opening where the flow path is narrowed. Further, compared to a filter made of ceramic foam, local collection on the inlet side surface is suppressed, and collection can be performed while effectively utilizing the entire filter element. Therefore, blow-off to the outside is less likely to occur, and an increase in pressure loss due to local collection can be avoided.
【図１】この発明の排気フィルタに用いられる格子状金
属板を積層状態で示す要部平面図。FIG. 1 is a plan view of essential parts showing a laminated state of lattice-shaped metal plates used in the exhaust filter of the present invention.
【図２】同じく格子状金属板を積層状態で示す要部の斜
視図。FIG. 2 is a perspective view of the main parts similarly showing the grid-like metal plates in a stacked state.
【図３】上記格子状金属板を用いたフィルタエレメント
の斜視図。FIG. 3 is a perspective view of a filter element using the lattice-shaped metal plate.
【図４】この発明に係る排気フィルタの全体的構成を示
す断面図。FIG. 4 is a sectional view showing the overall configuration of an exhaust filter according to the present invention.
【図５】格子状金属板の形成方法の一例を示す説明図。FIG. 5 is an explanatory diagram showing an example of a method for forming a grid-like metal plate.
１…ケーシング ５…フィルタエレメント ６…格子状金属板 ７…フレーム １０…開口部 1...Casing 5...Filter element 6...Grid metal plate 7...Frame 10...Opening part
Claims (1)
数形成されてなる格子状金属板を、上記開口部の対角線
方向に交互にずらして多数枚積層し、かつ上記開口部の
対角線方向に略沿って排気が通流するように、この格子
状金属板の積層体を筒状のフレーム内に収容したことを
特徴とする内燃機関の排気フィルタ。Claim 1: A large number of lattice-shaped metal plates each having a large number of substantially rectangular openings separated by lines are laminated so as to be alternately shifted in the diagonal direction of the openings, and the diagonal of the openings 1. An exhaust filter for an internal combustion engine, characterized in that the laminate of lattice-shaped metal plates is housed in a cylindrical frame so that exhaust gas flows substantially along the direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3115862A JP2722854B2 (en) | 1991-05-21 | 1991-05-21 | Exhaust filter for internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3115862A JP2722854B2 (en) | 1991-05-21 | 1991-05-21 | Exhaust filter for internal combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04342816A true JPH04342816A (en) | 1992-11-30 |
| JP2722854B2 JP2722854B2 (en) | 1998-03-09 |
Family
ID=14672993
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3115862A Expired - Lifetime JP2722854B2 (en) | 1991-05-21 | 1991-05-21 | Exhaust filter for internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2722854B2 (en) |
-
1991
- 1991-05-21 JP JP3115862A patent/JP2722854B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JP2722854B2 (en) | 1998-03-09 |
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