Mazda Motor Corporation

Y-tec Corporation

Shun Kuwako

Hiroyuki Takahashi

Kazuhiro Nishimura

Hideaki Kawaguchi

Masayuki Jobira

Nobuyuki Nakado

A torsion beam of a vehicle torsion beam suspension has a closed cross section. A beam center portion has an inverse substantially v-shaped cross section or a substantially v-shaped cross section. Circumference increasing portions having a longer circumferential length toward the beam ends are disposed at opposite sides of the beam center portion. Each circumference increasing portion has a beam width that is a width in the fore and aft direction of a vehicle body, the beam width gradually increasing toward a beam end, and increasing at a higher rate as a position of the beam width is closer to the beam end.

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Hiroshima, Japan

Shun Kuwako