Case for endless transmission member

A case for an endless transmission member, the case comprising:

• a first case configured to be attached to a vehicle-mounted internal combustion engine;
• and
• a second case attached to the first case, wherein
• an accommodation chamber is defined by a space between the first case and the second case and is configured to accommodate an endless transmission member looped over a plurality of rotating bodies of the vehicle-mounted internal combustion engine,
• the first case includes a main wall portion between the accommodation chamber and an inside of the vehicle-mounted internal combustion engine and includes a communication hole extending through a thickness of the main wall portion to connect the accommodation chamber to the inside of the vehicle-mounted internal combustion engine,
• the first case includes a guide rib configured to guide lubricant from the accommodation chamber to the inside of the vehicle-mounted internal combustion engine through the communication hole, the guide rib extending from an opening edge of the communication hole toward the space of the accommodation chamber, and
• in an orientation of the case when the vehicle-mounted internal combustion engine is installed in the vehicle,
• the communication hole includes a lower section which includes a lowest end of the opening edge and has a width that decreases toward the lowest end, and
• the guide rib includes an upper surface with a curved surface extending along the opening edge of the lower section of the communication hole, the curved surface curving downward from the space of the accommodation chamber toward the opening edge such that lubricant in the accommodation chamber moves toward the opening edge and through the communication hole to the inside of the vehicle-mounted internal combustion engine.