There is provided a method of manufacturing a suspension arm for a vehicle. The method includes a preform forming operation of forming a preform as a preliminary molding object for forming the suspension arm for a vehicle; and a main-molding-object forming operation of hot-pressing the preform to form a main molding object for forming the suspension arm for a vehicle. The preform formed in the preform forming operation may be formed in a shape corresponding to a shape of the main molding object, and may be formed in a shape offset inward from an outer shape of the main molding object by a predetermined dimension.

On at least one surface of a structural part, on all or part of a hollow section between outer and inner peripheral borders, is associated at least one cover sheet made of rigid metallic material. The at least one cover sheet is mechanically fixed with the edge of the peripheral borders of the structural part, and covers all or part of inner cavities formed on open sides of the part. The at least one cover sheet has a triple function: to increase the rigidity of the structural part, to absorb shock by deforming in a plane while remaining integral with the part, and to allow reduction of the mass of the structural part and optimization of the mass/performance ratio.

The disclosure relates to an elongate link arm member of a support link arm. A ball joint socket is disposed on a first longitudinal and of the link arm member. The link arm member in a sheet-metal shell construction mode is formed from sheet metal and has a cavity portion. The ball joint socket is a forging or casting from metal and possesses a fastening appendage which is configured in a materially integral manner so as to be in one piece with said ball joint socket. The ball joint socket by way of the fastening appendage engages in the cavity portion of the link arm member and is joined to the link arm member.

The support link arm according to the invention has an elongate link arm member. A ball joint socket is disposed on a first longitudinal and of the link arm member. The link arm member in a sheet-metal shell construction mode is formed from sheet metal and has a cavity portion. The ball joint socket is a forging or casting from metal and possesses a fastening appendage which is configured in a materially integral manner so as to be in one piece with said ball joint socket. The ball joint socket by way of the fastening appendage engages in the cavity portion of the link arm member and is joined to the link arm member.

A stabilizer is a stabilizer including: a main body cylinder portion which is elastically deformable and a pair of connection plate portions respectively connected to a pair of left and right suspension devices, wherein the connection plate portion includes a pair of base material portions located on both sides in the connection plate portion in a plate thickness direction T and an alloy oxide region which is disposed between the pair of base material portions and in which alloy oxides are scattered, and wherein crystal grains constituting the pair of base material portions straddle the alloy oxide region in the plate thickness direction and the pair of base material portions are joined.

A fastening arrangement of a vibration damper of a vehicle includes a rubber bearing with a first bush and a second bush, a fastener where via the fastener one of the first bush and the second bush of the rubber bearing is fixed in three degrees of longitudinal freedom with regard to a wheel support of the vehicle or the body of the vehicle, and a measure disposed on the second bush and on the wheel support or on the body of the vehicle where via the measure a degree of rotational freedom of the second bush about an axis of the fastener is blocked by a positively locking block. The positively locking block is formed by a convexly curved cylinder segment of the second bush and a concavely curved cylinder segment of the wheel support or the body of the vehicle that are engagable into one another.

An aluminum alloy forging of the present invention includes 0.15 wt % to 1.0 wt % of Cu, 0.6 wt % to 1.3 wt % of Mg, 0.60 wt % to 1.45 wt % of Si, 0.03 wt % to 1.0 wt % of Mn, 0.2 wt % to 0.4 wt % of Fe, 0.03 wt % to 0.4 wt % of Cr, 0.012 wt % to 0.035 wt % of Ti, 0.0001 wt % to 0.03 wt % of B, 0.25 wt % or less of Zn, 0.05 wt % or less of Zr, the balance being Al and inevitable impurities. When integrated intensity of a diffraction peak of an AlFeMnSi phase in an X-ray diffraction pattern obtained by an X-ray diffraction measurement of a cross-section of the forging is “Q.sub.1” (cps.Math.deg) and integrated intensity of a diffraction peak of a (200) plane of an Al phase is “Q.sub.2” (cps.Math.deg), a value of Q.sub.1/Q.sub.2 is 6×10.sup.−2 or less.

A method for manufacturing a stabilizer, the stabilizer including a main body bar that is elastically deformable, and a pair of connecting plates that are separately connected to a pair of left and right suspension devices, the method including a forging step of forming the connecting pate by forging both end portions of a material tube, in which in the forging step, both end portions of the material tube are crushed in a radial direction to be formed into the connecting plate in a state where a sealing metal plate heated to a temperature equal to or higher than a melting point is disposed inside both end portions of the material tube heated to a temperature lower than the melting point.

In accordance with one aspect of the present disclosure, a suspension strut for use on a work machine is provided. The suspension strut may have a forged one piece cylindrical inner housing that includes a hollow rod which forms a circumferential piston at an open end and a lower clevis at a closed end of the hollow rod. The suspension strut may further have a forged one piece cylindrical outer housing that includes a hollow barrel having an interior and an exterior surface, a closed end that forms an upper clevis, an open end, and a port on an outside surface of the hollow barrel. Further, the inner and outer housing may be coupled by a disk shaped end cap attached to the open end of the hollow barrel having an inner diameter that is slideably engaged with an outer surface of hollow rod.

A method of manufacturing a forged product includes a heating step, a first and a second forging steps, wherein the forging temperature in the heating step is 450° C. or higher and 550° C. or lower, and surface temperatures of the upper molding part of the first upper die in the first forging step and the upper molding part of the second upper die in the second forging step are 150° C. or higher and 190° C. or lower, surface temperatures of the lower molding parts of the first and the second lower dies are 190° C. or higher and 230° C. or lower, and the surface temperatures of the lower molding parts of the first and the second lower dies are higher by 5° C. or more than the surface temperatures of the upper molding parts of the first and the second upper dies.