Patent ID: 8474418

Claim:
A partition member that divides a groove-like cooling passage formed in a cylinder block of an internal combustion engine into a plurality of passages in a direction defined by a depth of the cooling passage, wherein a cooling heat medium flows through the cooling passage, the cooling passage having a bottom surface and a pair of opposing inner surfaces, the partition member comprising: a separating member arranged in the cooling passage, wherein, before being arranged in the cooling passage, the separating member has a width wider than a width of the cooling passage, and wherein the separating member is elastically deformable such that the width of the separating member can be reduced to a size that allows the separating member to be arranged in the cooling passage; and a spacer having a thickness that is less than the width of the cooling passage, wherein the spacer is arranged between the separating member and the bottom surface, thereby creating a distance between the bottom surface and the separating member; wherein: the cooling passage extends continuously to encompass all cylinder bores formed in the cylinder block, the separating member having an opening at a position that corresponds to a part of the cooling passage in a circumferential direction, the spacer extends along the entire circumference of the cooling passage, and the spacer has a guide wall at a position that corresponds to the opening of the separating member, the guide wall guiding the cooling heat medium to a cooling passage of a cylinder head, and the separating member is coupled with an upper end surface of the spacer, and the guide wall extends toward the cylinder head relative to the separating member.