A plate assembly for a motor vehicle may include a first plate, a second arranged substantially parallel to the first plate, the second plate defining a plurality of perforations, and a mesh core including a plurality of wire bundles, the core arranged between the plates, wherein the mesh core is rigidly joined to an inner surface of each plate via the perforations.

A press-formed product includes a main body part having a first end part and a second end part respectively on both ends, and a protruded part that protrudes outward of bending from a bent part of the main body part. On a surface of the top plate part of the main body part, a groove part is provided in a domain on the first end part side from a root of the protruded part. A first vertical wall part extending from the first end part of the main body part to the protruded part has a corner part connecting the main body part and the protruded part. An angle that is formed by a part which is on the main body part side from the corner part and a part which is on the protruded part side from the corner part is an acute angle.

The present invention is a torsion beam suspension 100 including an upper member 10 and a lower member 20, and including right and left trailing arms 50 configured to include a pair of trailing arm configuration members 11 and the pair of lower members and configured to extend in a longitudinal direction of a vehicle body and to be swingable in a vertical direction and a torsion beam 16 which is disposed between the right and left trailing arm configuration members of the upper member 10. The lower member includes an upper connection 21 and a beam joint portion 22 inclined from the upper connection 21 to a bottom portion of the U-shaped cross section of the torsion beam and joined with the torsion beam.

An automobile undercarriage part of the present invention is an automobile undercarriage part including a welded joint in which a first steel sheet and a second steel sheet are overlapped and a fillet weld is formed between an end surface of the first steel sheet and a surface of the second steel sheet, in which a chemical composition of a weld metal that forms the welded joint contains, with respect to a total mass of the weld metal, by mass %, C: 0.02% to 0.20%, Si: more than 0% to less than 0.10%, Mn: 0.3% to 2.0%, Al: 0.002% to 0.30%. Ti: 0.005% to 0.30%, P: more than 0% to 0.015%, and S: more than 0% to 0.030%, and the following formula (1) and formula (2) are satisfied.
[Al]+[Ti]>0.05Formula (1)
7[Mn]112[Ti]30[Al]4.0Formula (2)

A leaf spring for a wheel suspension of a motor vehicle, comprises a first spring part made from a fibre reinforced plastic material and a second spring part made from a steel material. The first spring part and the second spring part are connected to each other. The ratio of the length of the first spring part to the length of the second spring part is larger than two. A leaf spring assembly can include such a leaf spring and receiving devices.

A press-formed product includes a main body part having a first end part and a second end part respectively on both ends, and a protruded part that protrudes outward of bending from a bent part of the main body part. On a surface of the top plate part of the main body part, a groove part is provided in a domain on the first end part side from a root of the protruded part. A first vertical wall part extending from the first end part of the main body part to the protruded part has a corner part connecting the main body part and the protruded part. An angle that is formed by a part which is on the main body part side from the corner part and a part which is on the protruded part side from the corner part is an acute angle.

A wheel carrier mounted on a rear axle body of a vehicle, which wheel carrier comprises a supporting plate and a bearing plate. The supporting plate coincides with a virtual king-pin axis and the properties of the supporting plate are such that the supporting plate may bend around the virtual king-pin axis in the area of a flexible supporting section. The bearing plate comprises a section with such properties that the section is allowed to deflect in a lateral direction of the vehicle. When a lateral force F.sub.lateral and a brake force F.sub.brake are applied to the wheel carrier, e.g. during cornering and braking, the properties of the supporting plate and the bearing plate create lateral force under steer and brake force under steer.

A bolster spring for a vehicle suspension including a base plate, a top plate, elastomeric material positioned between the base plate and the top plate, a first flange comprising a pair of ears having a bottom mounting surface upwardly extending from a first end of the base plate at an angle , and one or more mounting holes positioned in the pair of ears in the first flange adapted for attachment to a pair of ears on an upwardly extending flange on a second bolster spring.

[Object] Damage to a surface of a resin bush caused by press-fitting is prevented even when a configuration for positioning during welding is added.

[Solving Means] A rolled collar (40) is a steel rolled collar into which a resin bush (90) is pressed-fitted, and which is joined to a joining member by welding. The rolled collar includes a main body part (50) formed in a hollow cylindrical shape, and a clinch part that joins both end surfaces of the main body part together by fitting. The rolled collar includes a notch part (70) formed by cutting off a portion of an annular edge (53) in the main body part. Here, a convex jig determining a position of the main body part at a time of welding is fit into the notch part. The rolled collar includes a cavity part (80) formed to be hollow from an inner circumferential surface side on a wall surface around the notch part to form a clearance (81) between the press-fitted resin bush and an edge portion (71) of the notch part on the inner circumferential surface side.