Honeycomb structure

A honeycomb structure comprising a honeycomb segment bonded member including;

• a plurality of prismatic columnar shaped honeycomb segments;
• and a bonding layer mutually bonding side faces of the plurality of honeycomb segments, wherein
• the honeycomb segments have a porous partition wall disposed so as to surround a plurality of cells extending from a first end face as an inlet side of fluid to a second end face as an outlet side of the fluid;
• and a segment outer wall defining side faces of the honeycomb segment,
• one honeycomb segment out of the plurality of honeycomb segments has at least one bulge that bulges outward on one side face of the one honeycomb segment,
• the at least one bulge is provided so as to start from either the first end face or the second end face in an axial direction from the first end face to the second end face of the one honeycomb segment and extend in the axial direction,
• another honeycomb segment out of the plurality of honeycomb segments has at least one recess that is recessed inward on one side face of the another honeycomb segment,
• the at least one recess is provided so as to start from either the first end face or the second end face in an axial direction from the first end face to the second end face of the another honeycomb segment and extend in the axial direction,
• in the honeycomb segment bonded member, the one honeycomb segment and the another honeycomb segment are disposed adjacent to each other so that their one side faces are opposed to each other, and bonded to each other via the bonding layer with the bulge of the one honeycomb segment inserted in the recess of the another honeycomb segment,
• length W2 of the bulge in a width direction orthogonal to the axial direction and a bulging height direction of the bulge is smaller than length W1 of the one side face of the one honeycomb segment in the width direction,
• length W4 of the recess in a width direction orthogonal to the axial direction and a recessing direction of the recess is smaller than length W3 of the one side face of the another honeycomb segment in the width direction,
• a base part in the bulging height direction of the bulge is defined with a bent side face that is bent from a flat portion of the one side face,
• angle θ1 formed between an imaginary bottom face of the bulge, which includes a plane imaginarily extending from the flat portion of the one side face, and the bent side face of the bulge being 60° or more;
• wherein length W2 of the bulge in the width direction is 20 to 70% of length W1 of the one side face of the one honeycomb segment in the width direction, and length W4 of the recess in the width direction is 20 to 70% length W3 of the one side face of the another honeycomb segment in the width direction.