Case

A case that houses a drive force transmission device, comprising:

• a circular ring part defining an opening through which a shaft that transmits a drive force is configured to be inserted;
• a plurality of fastening boss parts provided around the circular ring part, to which fastening members are to be secured;
• a plurality of first ribs respectively formed between a portion of the fastening boss parts and the circular ring part when viewed from an axial direction of the shaft;
• a non-fastening boss part provided between adjacent ones of the fastening boss parts to which the first ribs are not connected when viewed from the axial direction, a fastening member being not configured to be secured to the non-fastening boss part;
• and
• a second rib formed between the non-fastening boss part and the circular ring part, the second rib extending along a line passing through a hole or a recess defined by the non-fastening boss part when viewed from the axial direction of the shaft, wherein
• when viewed from the axial direction, the non-fastening boss part is provided between one end face of the case in a radial direction of the shaft and the circular ring part, and
• casting of the case is done by supplying molten metal from a side of the one end face in the radial direction.

A case that houses a drive force transmission device, comprising:

• a circular ring part defining an opening through which a shaft that transmits a drive force is to be inserted;
• a plurality of fastening boss parts provided around the circular ring part, to which fastening members are to be secured;
• a plurality of first ribs respectively connected to outer circumferences of a portion of the fastening boss parts and the circular ring part when viewed from an axial direction of the shaft;
• a non-fastening boss part provided between adjacent ones of the fastening boss parts to which the first ribs are not connected when viewed from the axial direction, a fastening member being not configured to be secured to the non-fastening boss part;
• and
• a second rib formed between the non-fastening boss part and the circular ring part, the second rib extending along a line passing through a hole or a recess defined by the non-fastening boss part when viewed from the axial direction of the shaft.