Vehicle suspension unit, particularly for an electric vehicle, with a transverse leaf spring

A vehicle suspension unit includes a frame module and two wheel supports each connected to the frame module by upper and lower oscillating arms, each arm having a first end portion swivelly connected to the respective wheel support by a first swivel joint and a second end portion swivelly connected to the frame module by a second swivel joint. A suspension spring arrangement includes a single leaf spring, constituting a separate element with respect to the upper and lower arms and arranged transversely relative to a vehicle longitudinal direction, in a symmetrical position relative to a vehicle vertical median plane. The leaf spring has a central portion connected to the frame module and end portions connected to the upper arms. In one version, the central portion is connected to the frame module by a device for adjustment of a position in height of said central portion relative to the frame module.