Honeycomb structure

A honeycomb structure in which a plurality of honeycomb segments are integrally bonded via a bonding material, each of the honeycomb segments having a first end surface, a second end surface, porous partition walls to define and form a plurality of cells extending from the first end surface to the second end surface, and an outer peripheral surface connecting the first end surface to the second end surface,

• wherein as to each of the honeycomb segments other than the honeycomb segments positioned in the outermost periphery of the honeycomb structure among the plurality of honeycomb segments,
• the first end surface has a quadrangular shape,
• the second end surface has a quadrangular shape having an area larger than that of the first end surface,
• the outer peripheral surface comprises four side surfaces,
• the four side surfaces are constituted of a pair of parallel side surfaces including two side surfaces facing each other in parallel and a pair of tapered side surfaces including two side surfaces facing each other so that a space between the surfaces narrows from the side of the second end surface toward the side of the first end surface,
• when the first end surface is seen from a vertical direction thereto, both of X and Z are from 0.3 to 7 mm, where X is a distance between a side constituting the shape of the first end surface and coming in contact with the one side surface in the pair of tapered side surfaces and a side constituting the shape of the second end surface and coming in contact with the one side surface in the pair of tapered side surfaces, and Z is a distance between a side constituting the shape of the first end surface and coming in contact with the other side surface in the pair of tapered side surfaces and a side constituting the shape of the second end surface and coming in contact with the other side surface in the pair of tapered side surfaces,
• S1/S2 is 0.8 or more, where S1 is the area of the first end surface and S2 is the area of the second end surface,
• the plurality of honeycomb segments are disposed to constitute a plurality of parallel rows extending in a predetermined direction on an end surface of the honeycomb structure, and
• the honeycomb segments constituting the respective rows have a relation between adjacent honeycomb segments in which the first end surfaces of the respective honeycomb segments are directed opposite to each other, and the tapered side surfaces of adjacent honeycomb segments face each other.