Abstract: A suspension system comprises front and rear cantilever spring arms. First end portions of the arms are fixed to a vehicle body. Second end portions of the arms extend toward a member for supporting a wheel. The second end portions are connected to each other by means of a curved section. The spring arms are formed integrally with the curved section through the medium of the matrix resin and the fibers so as to be V-shaped as viewed from above. A joint assembly is fixed to the curved section, and a hub carrier is mounted on the assembly.

Abstract: A suspension system comprises front and rear cantilever spring arms. First end portions of the arms are fixed to a vehicle body. Second end portions of the arms extend toward a member for supporting a wheel. The second end portions are connected to each other by means of a curved section. The spring arms are formed integrally with the curved section through the medium of the matrix resin and the fibers so as to be V-shaped as viewed from above. A joint assembly is fixed to the curved section, and a hub carrier is mounted on the assembly.

Abstract: A suspension system comprising a pair of fiber reinforced plastic spring arms, right and left, and a beam assembly connecting the respective free ends of the arms, said springs arms having a free-end-side portion and being vertically bendable, each spring arm serving as a suspension spring. A fixed end of each spring arm is fixed to a vehicle body. The beam assembly, which extends in the transverse direction of the vehicle body, includes an intermediate beam member of fiber reinforced plastic and metallic end beam members fixed individually to two opposite end portions of the intermediate beam member. Each end beam member is provided with an axle. If the right and left spring arms are subjected to loads of opposite phases at the time of turning, the intermediate beam member is twisted to produce a stabilizer effect.

Abstract: A hydropneumatic suspension for a left wheel and a hydropneumatic suspension assembly for a right wheel are connected to each other by means of an anti-roll cylinder. A sub-tank is connected to each suspension assembly. A spring constant switching valve is disposed between each suspension assembly and its corresponding sub-tank. The sub-tanks are charged with a compressed inert gas. When a vehicle turns, the anti-roll cylinder operates so that some of oil is discharged from the inside suspension assembly, while oil is supplied to the outside suspension assembly. While the vehicle is turning, the spring constant switching valve for outside suspension assembly is opened, so that the outside suspension assembly is caused to communicated with its corresponding sub-tank, whereby the spring constant of the outside suspension assembly is lowered. When the turning movement is finished, the spring constant switching valve is closed, so that the suspension assembly is disconnected from the sub-tank.

Abstract: In a cushion which uses synthetic cotton formed of curled polyester fibers, the synthetic cotton is a mixture of first and second fibers having two different thicknesses. The fibers are three-dimensionally intertwined with air-passing space. The first fibers have the denier value of 20 or more, while the second fibers have the denier value of less than 20. The first and second fibers are mixed in the ratio of 0.5 to 2:1 by weight. These fibers of the synthetic cotton are bound at their intersections by means of a polyurethane binder such that the air-passing space is maintained.

Abstract: In a FRP leaf spring consisting of a main body and a rib, the main body has a taper portion so tapered that the thickness of the main body varies continuously along the longitudinal direction thereof, and the rib is projected integrally from the main body in the direction of the thickness thereof, extending along the longitudinal direction of the main body, so that the total sectional area of the main body and the rib, as well as the width of the main body, is kept substantially fixed in every position along the longitudinal direction to ensure uniform stress distribution.

Abstract: An FRP leaf spring wherein finer continuous fibers are embedded in that thickness range of the leaf spring to which tension stress is applied, and continuous fibers of greater diameters are embedded in that thickness range of the leaf spring to which compression stress is applied.