Patent ID: 8398178

Claim:
A vehicle wheel disk comprising: a hub coupling portion; an inclined portion being substantially conical and rising from the hub coupling portion; a plurality of spoke portions each extending outwardly from the inclined portion in a radial direction of the wheel; a vent window located between adjacent spoke portions of the plurality of spoke portions; and a radially outer disk portion located at a radially outer end portion of the wheel and connecting radially outer end portions of the plurality of spoke portions in a circumferential direction of the wheel, wherein the inclined portion extends radially outwardly and axially outwardly from the radially outer portion of the hub coupling portion, wherein the spoke portion has a spoke bottom wall and a spoke side portion, the spoke bottom wall extending outwardly from the inclined portion in the radial direction of the wheel, the spoke side portion including a spoke side wall rising from the spoke bottom wall in an axial direction of the wheel and a spoke reinforcing wall connected from an axially end portion of the spoke side wall and curved from the axial direction of the wheel toward the circumferential direction of the wheel and extending in the circumferential direction of the wheel, and wherein a pair of spoke side portions located on opposite sides of the vent window in the circumferential direction of the wheel have radially inner end portions are both connected to a common connecting wall, the connecting wall being flat or substantially flat in the circumferential direction of the wheel, the connecting wall being connected to the inclined portion at a radially inner end of the connecting wall.