Rear suspension system for an automotive vehicle

A rear suspension system for an automotive vehicle including a rear wheel, a support member for rotatably supporting said rear wheel and a rear lower arm having one end pivotally supported on a vehicle body and the other end pivotally supported on said vehicle body at a rearward portion with a center of said rear wheel, comprising;

• a T-shaped front lower arm provided with a lateral arm portion disposed parallel to said rear lower arm and a forward arm portion extending forwardly from an intermediate part of said lateral arm portion,
• said lateral arm portion having a first pivotal point pivotally supported on said vehicle body and a second pivotal point pivotally supported on said support member at a forward portion with the center of said rear wheel,
• said forward arm portion having a third pivotal point pivotally supported on said vehicle body via a bush, which is located inwardly from a line extending through the second pivotal point and an intersection defined by an extension line extending from a center line of the rear lower arm and a central plane of the rear wheel,
• said bush having a ratio of a longitudinal spring constant thereof to a lateral spring constant thereof, which is smaller than a ratio of a tangent of an angle defined by a line extending through the third pivotal point and the first pivotal point as well as a lateral axis of the vehicle to a tangent of an angle defined by a line extending through the third pivotal point and the second pivotal point as well as a longitudinal axis of the vehicle.