Mazda Motor Corporation

Tetsuya Shirosaka

Haruaki Iseri

Provided is a vehicle suspension device capable of obtaining excellent steering stability and good riding comfort in conformity to a tire longitudinal spring constant. The suspension device () comprises: an upper arm (); a lower arm (); a wheel support (); and a shock absorber () having an upper end attached to a vehicle body (B) of a vehicle and a lower end attached to the lower arm, wherein the upper arm and the lower arm are arranged such that a ratio &#x3b6;of a scuff change-based apparent damping coefficient Cto a critical damping coefficient Cof the suspension device becomes equal to or greater than a lower limit, under the condition that the vehicle is traveling straight ahead on a flat road at a given vehicle speed, wherein the scuff change-based apparent damping coefficient Cis obtained by dividing, by a stroke speed of a wheel, an up-down directional component of a vehicle width-directional force arising on a ground contact surface of the wheel due to a vehicle width-directional displacement of the wheel occurring along with a stroke of the wheel, and the lower limit is set such that it becomes larger as a tire longitudinal spring constant of the wheel becomes smaller.

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Hatsukaichi, Japan

Tetsuya Shirosaka