Abstract: A bonded piston seal, which comprises a metal ring, and a rubbery elastomer seal as vulcanization-bonded thereto expect the sliding site along which a mating seal member slides, where the rubbery elastomer seal is partially bonded to the metal ring through an adhesive layer, wherein the adhesive layers comprises (a) an underlayer adhesive layer comprising a phenol resin and an epoxy resin, and (b) an overlayer adhesive layer comprising a phenol resin, a halogenated polymer, and a metal oxide. Not only the distinguished initial adhesiveness, but also the distinguished water-resistance can be obtained by providing (a) the underlayer adhesive layer of the afore-mentioned components and (b) the overlayer adhesive layer of the afore-mentioned components.

Abstract: The problem to be solved by the present invention is to clear up an eccentric load onto a pin and a problem of deformation and cavity due to flowing material during extrusion when spring washer blind-holes in a piston for an automobile transmission are formed by extrusion with a pin. After an annular region along the peripheral edge portion on the back of an end plate of a secondary workpiece is flattened, the secondary workpiece is set on a lower die. Further, while the lower die is pressed with upper dies and cushion pressure is applied on the lower die, pins, for piercing the spring washer blind-holes are made to perform an extrusion operation onto the end plate of the secondary workpiece from the backside of the end plate. The extruded material is made to flow into recess holes of the upper die, and thus spring washer blind-holes are formed. Then, projections which have flowed and protrude on the front side are removed by turning with a lathe.

Abstract: To make it unnecessary to insert a plate spring as a separate part between a metal ring (2) and a mating member (11) to be coupled therewith such as a clutch plate, and reduce the number of parts and the assembly manhours, the sealing device (1) includes the metal ring (2) and seal sections (3) such as packings supported by the metal ring (2), and the metal ring (2) is provided with a intimate-contact region (4) for intimately contacting to the mating member (11) to be coupled, wherein the sealing device (1) is characterized in that the intimate-contact region (4) of the metal ring (2) is integrally formed with pawl-like intimate-contact sections (6) which are in the form of a pawl and which exert spring force on the mating member (11) to be coupled, and is used, for example, as a bonded piston seal (BPS) in an automatic transmission.

Abstract: A piston includes a piston main body and a seal ring. The seal ring has a metal ring including a fitting tube portion fitted to a cylinder portion of the piston main body and a flange portion extending radially to axially oppose a pressure receiving portion of the piston main body, and a rubber-like seal main body provided on the metal ring. The seal main body has a first seal lip contacting an inner surface of a clutch cylinder, a second seal lip extending from an end of the flange portion to contact the pressure receiving portion, and an axial direction compression seal portion provided on the flange portion and compressed toward the pressure receiving portion.

Abstract: A bonded piston ring, which comprises a metal ring, and a rubbery elastomer seal as vulcanization-bonded thereto except the sliding site along which a mating seal member slides, where the rubbery elastomer seal in partially bonded to the metal ring through an adhesive layer, wherein the adhesive layers comprise (a) an underlayer adhesive layer comprising a phenol resin and an epoxy resin, and (b) an overlayer adhesive layer comprising a phenol resin, a halogenated polymer, and a metal oxide. Not only the distinguished initial adhesiveness, but also the distinguished water-resistance can be obtained by providing (a) the underlayer adhesive layer of the afore-mentioned components and (b) the overlayer adhesive layer of the afore-mentioned components.

Abstract: The problem to be solved by the present invention is to clear up an eccentric load onto a pin and a problem of deformation and cavity due to flowing material during extrusion when spring washer blind-holes in a piston for an automobile transmission is formed by extrusion with a pin. After an annular region along the peripheral edge portion on the back of an end plate 3c of a secondary workpiece 3 is flattened, the secondary workpiece 3 is set on a lower die 11f. Further, while the lower die is pressed with upper dies 10f, 10g and cushion pressure is applied on the lower die 11f, pins 13, 13 . . . for piercing the spring washer blind-holes are made to perform an extrusion operation onto the end plate 3c of the secondary workpiece 3 from the backside of said end plate. The extruded material is made to flow into recess holes 10f1, 10f1 . . . of the upper die 10f and thus spring washer blind-holes 5, 5 . . . are formed.

Abstract: To avoid strict control of flatness of a pressing portion, while keeping stability, in a sealing device comprising a metal ring and a seal portion, a metal ring (2) has an annular pressing portion (5) provided with a predetermined width in a diametrical direction for pressing an opponent member (11) when the metal ring (2) shifts in the axial direction, pressing surface (7) of the pressing portion (5) is formed in a circular arc or wavy sectional shape protruding toward the opponent member (11), the pressing portion (5) is constituted by an outward flange portion (6) integrally formed at an end of a tubular portion (4) of the metal ring (2), and the flange portion (6) has a smaller thickness than the tubular portion (4) and is formed in a circular arc or wavy sectional shape so as to have a spring characteristic.

Abstract: To provide a method for producing a steel component integrally having a rubber portion without necessity to remove by a lathe turning a film formed on the surface of a steel component by a chemical conversion treatment and without deterioration of water-resistant adhesive property and anti-corrosion property during production steps due to omission of the chemical conversion treatment, the method for producing a steel component integrally having a rubber portion includes the steps of subjecting a surface of a steel component to a chemical conversion treatment with iron phosphate as a ground treatment (step S3), partially coating an adhesive on a portion to which a rubber portion is to be bonded (step S4), and bonding the rubber portion via baking to the steel component (step S5).

Abstract: In order to prevents a crack from being generated in an end portion of stoppers (13) formed for regulating a diametrical expansion of a snap ring (2) in a cancel plate (1) due to stress concentration, the cancel plate (1) having an inner peripheral flange portion (12) locked to an inner peripheral portion at a drive side in a hydraulic clutch apparatus via the snap ring (2) is structured such that a plurality of the stoppers (13) for regulating a diametrical expansion of the snap ring (2) due to centrifugal force are formed by pressing to protrude on the inner peripheral flange portion (12), and both end portions (13b) of each of the stoppers (13) with respect to a circumferential direction of the cancel plate (1) rise up in a state of being inclined or curved with respect to the inner peripheral flange portion (12).

Abstract: For incremental sealing performance and cost reduction, a piston comprises a piston main body (1) and a seal ring (2), the seal ring (2) comprises a metal ring (21) including a fitting tube portion (21a) fitted to a cylinder portion (12) of the piston main body (1) and a flange portion (21b) extending radially oppose axially to a pressure receiving portion (11) of the piston main body (1), and a rubber-like seal main body (22) provided on the metal ring (21), and the seal main body (22) has a first seal lip (221) contacting to an inner surface of a clutch cylinder (3), a second seal lip (222) extending from an end of the flange portion (21b) to contact with the pressure receiving portion (11) and an axial direction compression seal portion (223) provided on the flange portion (21b) and compressed toward the pressure receiving portion (11)

Abstract: A sealing device (1) in which, even when a seal member (6) having a core metal (4) and a sealing section (5) is fitted on a piston member (3) that axially reciprocates in a bottomed circular cylinder (2), force required for the fitting can be suppressed to a low level and as a result the core metal (4) of the seal member (6) is not deformed. The wall thickness of a circular cylindrical portion (42) fitted on the piston member (3), of the core metal (4) is reduced to provide the circular cylindrical portion with spring properties. Alternately, slits (44) are equally arranged on the circumference of the circular cylindrical portion (42) of the core metal (4) or, alternatively, the circular cylinder portion (42) is constructed from claws (45).

Abstract: In a hermetically sealing device provided by fitting and mounting a seal member on an annular member, fitting strength between the annular member and the seal member is reduced. A seal member (7) is provided with a reinforcing ring (7b), a contact part (72), which is integrally provided with the reinforcing ring (7b) and contacts a first outer circumference skirt part (13a) when it is fitted in the first outer circumference skirt part (13a) of a piston member (11), and a seal main body (7a) which has a seal lip (71) which hermetically contacts a circumference plane of a piston inserting hole (5).

Abstract: To make it unnecessary to insert a plate spring as a separate part between a metal ring (2) and a mating member (11) to be coupled therewith such as a clutch plate, and reduce the number of parts and the assembly manhours, the sealing device (1) includes the metal ring (2) and seal sections (3) such as packings supported by the metal ring (2), and the metal ring (2) is provided with a intimate-contact region (4) for intimately contacting to the mating member (11) to be coupled, wherein the sealing device (1) is characterized in that the intimate-contact region (4) of the metal ring (2) is integrally formed with pawl-like intimate-contact sections (6) which are in the form of a pawl and which exert spring force on the mating member (11) to be coupled, and is used, for example, as a bonded piston seal (BPS) in an automatic transmission.

Abstract: A part of a rubber layer of the base section of a piston seal is replaced with a reinforcement ring with high rigidity, and a part of the reinforcement ring reaches the root of a seal lip. This provides the piston seal with required rigidity. Further, providing an outer diameter side radial section on a piston body secures a contact width coming into contact with a section to be pressed. A piston has a piston body (111) having a clutch pressing section (111f) provided so as to be in surface-contact with a multiple disc clutch (105), a reinforcement ring (112) fitted on the outer periphery of an outer cylinder section (111e) of the piston body, and an outer peripheral seal lip (113a) provided on the reinforcement ring and in sealing contact with the inner peripheral surface (102a) of the outer peripheral section of a housing (102).

Abstract: A sealing device for application to relatively movable concentric members at an interface between liquid and air contains a seal lip having a pair of annular projections on the surface thereof on predetermined axial spacing. Free ends of the projections on the device having convergent surfaces wherein, on the liquid end of the device, the angularity of the surface facing the intermediate space is no less than that of the liquid-facing surface and, on the air end of the device, the angularity of the surface facing the intermediate space is greater than that of the air-facing surface.