Seal structure and mounting method of belt cover for internal combustion engine

A seal structure of a belt cover for an internal combustion engine, which includes a timing belt disposed on one end side of an internal combustion engine body in a direction of a cylinder bore row and drivingly coupling a crankshaft and a camshaft, and a predetermined other component disposed on the one end side of the internal combustion engine body, the seal structure of the belt cover accommodating the timing belt in a liquid-tight state, the seal structure comprising:

• an inner cover member disposed on a side of the internal combustion engine body with respect to the timing belt;
• and
• an outer cover member that is disposed on an opposite side of the internal combustion engine body with respect to the timing belt and accommodates the timing belt in the liquid-tight state together with the inner cover member,
• wherein the outer cover member is divided into at least an upper outer cover and a lower outer cover in a cylinder axis direction,
• the upper outer cover and the inner cover member have mating surfaces to be mated with each other in outer peripheral portions, respectively, and sealing in the direction of the cylinder bore row is formed by a first seal member accommodated in an accommodating groove formed in one of the mating surfaces,
• the upper outer cover and the lower outer cover have an upper mating surface and a lower mating surface to be mated with each other in a lower end portion and an upper end portion, respectively, and sealing in the cylinder axis direction is formed by a second seal member accommodated in an accommodating groove formed in the lower mating surface,
• a predetermined gap through which the upper outer cover passes is formed between the inner cover member and the other component, and
• the lower mating surface of the lower outer cover is provided with a plurality of protrusions spaced apart from each other to lock the upper outer cover inserted from above.