Nippon Gasket Company, Ltd.

Kenji Ishida

Kunitoshi Inoue

Yutaka Furuta

Tsuyoshi Hiramatsu

Tomoyoshi Ogaeri

Hiroshi Uemura

Naoki Ii

A metal gasket is disclosed which is used arranged between a cylinder block and a cylinder head. The metal gasket comprises carrier plates having thereon beads, and a stopper plate overlaid on the carrier plates and provided with folded constructions, which are each composed of a folded flange area and its counterpart area confronting each other so as to provide a gap of a preselected interval between them. The gaps exert elasticity on the folded flange areas continuously whenever the gasket is squeezed and loaded due to engine operation whereby the folded constructions may compensate for intolerable clearance that might occur owing to the distortion in fatigue of the cylinder block with respect to the gasket, with resulting in improving sealing performance of the gasket.

Metal gaskets

An engine gasket flattens the surface pressure occurring around holes, prevents the occurrence of impressions in and damage to a cylinder block and a cylinder head, and secures a stable sealing performance. This metal gasket has elastic metal plates and an intermediate metal plate interposed between these elastic metal plates. The elastic metal plates are provided with full beads along the circumferences of the holes so that the ridge portions of the full beads contact the intermediate metal plate. The intermediate plate has, on regions which are between the holes and full beads of the elastic metal plates, half beads extending toward the elastic metal plates. The elastic metal plates are folded back along the circumferences of the holes.

Metal gasket

In this metal gasket, the stopper plate stacked on the bead base plates has its reduced thickness portionwhose thickness is smaller than the thickness of the stopper plate body-folded back to form a stopper portion. This structure provides the stopper portion with a limited stopper function with fewer parts. Between a pair of bead base plates that seal around the bore holes of the metal gasket is clamped an intermediate plate as the stopper plate. Around the bore holes in the intermediate plate are arranged folded portions, whose total thickness is larger than the thickness of the stopper plate body, to restrict the deformation of the beads. The folded portions are formed by folding back fold parts onto base parts that are thinner than the stopper plate body. This structure can limit the step height (stopper height) of the intermediate plate without using other parts such as metal plates or stopper pieces.

A metal gasket in which a thin metal plate for reinforcing the beads of an elastic metal plate is laminated on bead regions only of the elastic metal plate, whereby a stable sealing performance is secured for a long period of time. This metal gasket comprises a thin metal plate provided with beads extending around the circumferences of parallel arranged combustion chamber holes, and an elastic metal plate having combustion chamber holes and extending with a predetermined width and laminated on the portions of the thin metal plate which are around the combustion chamber holes so as to be opposed to valley portions of the beads. The thickness of the thin metal plate is set smaller than that of the elastic metal plate. The thin metal plate is fixed to the elastic metal plate with locking portions formed at the outer circumference of the former engaged with slits formed in the regions of the latter which are on the outer sides of the beads, the thin metal plate being combined with the elastic metal plate at joint portions thereof by spot welding or laser welding.

Growing community of inventors

Osaka, Japan

Kenji Ishida