Patent ID: 7082919

Claim:
A mounting structure for an engine cover comprising: a protruded member which is provided protrudingly from a front surface of an engine side member and has a neck and a head with a larger diameter than the neck; and a recessed member which has an external circumferential surface small diameter section to be locked to a mounting hole of a mounting seat, which is arranged so as to be opposed to the protruded member, on a rear surface side of the engine cover, a press-fit passage holding the head of the press-fit protruded member on an internal circumference side of the external circumferential surface small diameter section, and a concave communicating with a depth end of the press-fit passage and defining a holding space for holding the head of the press-fit protruded member, wherein in the protruded member, at least a portion surrounding the concave is formed solid; in a press-fit position, the head is arranged closer to the rear surface of the engine cover than the mounting hole; and when it is assumed that an inner diameter of the mounting hole is D 1 , an outer diameter of the head is D 2 , an outer diameter of the external circumferential surface small diameter section before locking the mounting hole is D 3 , and an inner diameter of the press-fit passage before press-fitting the protruded member is D 4 , D 1 , D 2 , D 3 , and D 4 satisfy an inequality D 1 <D 2 +(D 3 −D 4 ).