A component comprises a mounting surface to male with another component, a seal channel extending into the mounting surface, and retention tabs extending into the seal channel at or below the mounting surface, wherein the retention tabs are spaced from each other about a perimeter of the seal channel. A method for manufacturing a component comprises producing a component with a seal channel in a flat mate face and mounds of material adjacent the seal channel that extend away from the flat mate face, and deforming the mounds of material to form retention tabs extending into the seal channel.

Seal ring groups to be assembled with edges of through holes of a gasket includes a plurality of sealing groups. One of the plurality of sealing groups has an inner peripheral shape different from an inner peripheral shape of another of the plurality of sealing groups to distinguish one sealing group from another sealing group.

A cylinder head [20, 120] mountable onto a cylinder block [16] of an engine [10] is disclosed. The cylinder head [20, 120] includes at least one fastener boss [28, 128] configured for receiving a fastener [24], and the cylinder head [20, 120] is securely fastened onto the cylinder block [16] of the engine [10] by the fastener [24]. A boss cutout [30, 130] is formed on a lower portion of the at least one fastener boss [28, 128] that abuts the cylinder block [16] such that a contact pressure balance of sealing pressures around the cylinder block [16] is evenly distributed.

A cylinder head [20, 120] mountable onto a cylinder block [16] of an engine [10] is disclosed. The cylinder head [20, 120] includes at least one fastener boss [28, 128] configured for receiving a fastener [24], and the cylinder head [20, 120] is securely fastened onto the cylinder block [16] of the engine [10] by the fastener [24]. A boss cutout [30, 130] is formed on a lower portion of the at least one fastener boss [28, 128] that abuts the cylinder block [16] such that a contact pressure balance of sealing pressures around the cylinder block [16] is evenly distributed.

A gasket to be attached between a cylinder head and a cylinder block of an internal combustion engine includes a pair of substrates, an intermediate plate disposed between the pair of substrates, and a spacer disposed between the pair of substrates. Each of the pair of substrates includes a cooling water sealing bead for sealing a cooling water passage surrounding a bore wall formed in the cylinder block. The intermediate plate includes a wedge portion formed in a shape corresponding to a deck surface of the bore wall of the cylinder block so as to be sandwiched between the bore wall and the cylinder head. The spacer is formed so as to extend in a cross direction S crossing an arrangement direction L of boreholes of the cylinder block without overlapping the cooling water sealing bead.

An elastic body includes an annular main body portion to be disposed in an annular gap, a seal lip portion extending from a portion, closer to an object to be sealed, of the main body portion and being to be in contact with an inner member, a flange portion extending outwardly from an end, opposite to the object to be sealed, of the main body portion and including a first side closer to the object to be sealed, the first side being to be in contact with an outer member, a side lip portion extending from the end opposite to the object to be sealed in a direction away from the object to be sealed, and a projecting portion formed circumferentially on a second side, opposite to the object to be sealed, of the flange portion. The side lip portion has a back surface configured to be in contact with the projecting portion in response to the side lip portion being pressed by a mating member disposed opposite to the object to be sealed.

A multi-layered metal sheet is disclosed formed of a laminate of a plurality of metal sheets fixed to each other by a clinch formed in a concave shape from one main surface toward another main surface, the clinch has an schematic pillar shape, the clinch being defined by an open top, a pair of cut surfaces which are respectively formed from the open top toward a bottom, a pair of inclined surfaces respectively inclined from the open top toward the bottom, transitional surfaces which connect the cut surfaces and the inclined surfaces to each other, and the bottom having overlapping parts which extend over the main surface of the multi-layered metal sheet on a lower side immediately below the cut surfaces, and lengthwise end portions of a cut formed in each of upper edge portions of the cut surfaces are disposed on upper edge portions of the transitional surfaces.

A multi-layer head gasket having at least two active layers and a shim layer sandwiched there between. The gasket and shim layer include cylinder openings aligned with the cylinders disposed within an engine block. The shim layer incorporates a plated portion for adding topography to an otherwise flat shim layer, the areas of plating determined based on FEA and/or pressure film load testing, for improving fatigue resistance, sealing pressure, and/or loading characteristics of the gasket.

A cylinder head for an internal combustion engine includes a casting and plug. The casting defines a first channel, a second channel, and a bore extending inward from an exterior surface of the casting. The first channel intersects a central portion of the bore. The second channel intersects an opposing end of the bore relative to the exterior surface. The plug is disposed within the bore. The plug has a distal end that engages the casting along the opposing end of the bore via a slip-fit engagement, a proximal end that engages the casting within the bore proximal to the exterior surface via a fixed engagement, and an intermediate portion that is spaced apart from the casting along the central portion of the bore. The plug defines an internal channel that establishes fluid communication between the first and second channels.

A gasket material, in which a crosslinked rubber layer compounding 30 to 200 parts by weight of titanium oxide based on 100 parts by weight of NBR or hydrogenated NBR is formed on a metal plate, improves blister resistance, and thus exhibits an excellent effect of preventing rubber peeling of the gasket in the engine and leading to an improvement of engine malfunction. Further, the use of NBR or hydrogenated NBR results in an advantage of low cost relative to that of fluororubber. Therefore, the gasket material of the present invention is effectively used as a cylinder head gasket.