Patent ID: 7156155

Claim:
A heat storage unit comprising: a main member provided with: a housing provided with openings at front and rear ends in the axial direction with identical cross-sections perpendicular to the axis; a plurality of wall sections within the housing, the wall sections including a fluid passage formation section which forms a fluid passage for circulating a heat containing fluid, on the inside of said housing, and a heat storage material filling space formation section which forms a heat storage material filling space for filling with a heat storage material, adjacent to said fluid passage on the inside of said housing; a plurality of reinforcing sections which extend inwardly from an interior surface of the housing into engagement with one of the wall sections; and a pair of lid members arranged at the front and rear ends of said main member, wherein said housing of said main member, said fluid passage formation section, and said heat storage material filling space formation section are integrally formed.