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US 10,870,077 B2Granted
Porous honeycomb filter
AssigneeDenso Corporation
InventorsYasushi Takayama, Shusaku Yamamura
Life of this patent
Estimating the term…
Abstract
Provided is a porous honeycomb filter comprising a porous first cell wall that permits exhaust gas to permeate, a second cell wall that permits exhaust gas to permeate than the first cell wall, and a cell that is surrounded by the first cell wall and the second cell wall to form an extending gas flow passage. The second cell wall has a smaller porosity than the first cell wall.
Claims23
A porous honeycomb filter comprising:
- a porous first cell wall that permits exhaust gas to permeate;
- a second cell wall that permits the exhaust gas to permeate less easily than the first cell wall;
- and
- a cell that is surrounded by the first cell wall and the second cell wall to form an extending gas flow passage, wherein
- the second cell wall has a smaller porosity than the first cell wall,
- the cell comprises a plurality of cells,
- the porous honeycomb filter further comprising a tubular outer shell constituting an outer periphery thereof,
- a plurality of the first cell walls and a plurality of the second cell walls partition an inside of the tubular outer shell into the cells,
- the first cell walls include an inclined wall extending inclined relative to an axial direction of the tubular outer shell, and the second cell walls include a parallel wall extending parallel to the axial direction.
6 more elements
A porous honeycomb filter comprising:
- a porous first cell wall that permits exhaust gas to permeate;
- a second cell wall that permits the exhaust gas to permeate less easily than the first cell wall;
- and
- a cell that is surrounded by the first cell wall and the second cell wall to form an extending gas flow passage, wherein
- the second cell wall has a smaller porosity than the first cell wall,
- the cell comprises a plurality of cells,
- the porous honeycomb filter further comprising a tubular outer shell constituting an outer periphery thereof,
- a plurality of the first cell walls and a plurality of the second cell walls partition an inside of the tubular outer shell into the cells,
- in a cross section of the porous honeycomb filter in the direction orthogonal to the axial direction of the tubular outer shell, a cross-sectional area Sa occupied by a plurality of the first cell walls and a cross-sectional area Sb occupied by a plurality of the second cell walls satisfy the following condition:
- Sa>Sb,
- the number of the second cell walls is fewer than the number of the first cell walls.
8 more elements
A porous honeycomb filter comprising:
- a porous first cell wall that permits exhaust gas to permeate;
- a second cell wall that permits the exhaust gas to permeate less easily than the first cell wall;
- and
- a cell that is surrounded by the first cell wall and the second cell wall to form an extending gas flow passage, wherein
- the second cell wall has a smaller porosity than the first cell wall,
- the cell comprises a plurality of cells,
- the porous honeycomb filter further comprising a tubular outer shell constituting an outer periphery thereof,
- a plurality of the first cell walls and a plurality of the second cell walls partition an inside of the tubular outer shell into the cells,
- in a cross section of the porous honeycomb filter in the direction orthogonal to the axial direction of the tubular outer shell, a cross-sectional area Sa occupied by a plurality of the first cell walls and a cross-sectional area Sb occupied by a plurality of the second cell walls satisfy the following condition:
- Sa>Sb,
- a thickness T1 of each first cell wall and a thickness T2 of each second cell wall satisfy the following condition:
- T1<T2.
9 more elements
Dependencies are inferred from the claim text.