The invention concerns a servo-assisted steering system for vehicles, the system having at least one steerable, rigid rear axle (1) steered by at least two cylinder-piston units (5, 6) which can be acted on hydraulically.
A motor mount 42 is connected between a swivel 44 and a live rear axle 46.
Each of the cylinder-piston units (5, 6) is disposed on one side of the rear axle (1) and is connected in hinged manner at one end to a frame (4) of the vehicle and, at the other, to the rear axle (1).
The bearing frame is connected to the rear axle by means of at least one lever (20) which is pivotally arranged and provided with a drive gear (19).
The inventive transformable personal transport means is provided with a chair (2) mounted on an abutting-lever structure which comprises a bearing frame and a rear axle.
A main deck (103), a stern deck (104) and a bow deck (105) are positioned on the hull and connecting rods (117) are provided on front and rear side of the hull for connecting two or more boats.
The vehicle is operable in first and second modes in which the ratios of the front and back differentials (including effect of the gearbox) (32) are respective greater than and less than 1:1.
The power transfer means enables advantageous packaging of a drive shaft (18) for driving a rear-positioned drive.