Abstract: The invention provides a process for producing gaskets that is capable of improving the wettability of the metal surface to thereby enhance the tackiness when rubber is anchored to a metal core material without using an adhesive.

Abstract: A high-performance gasket (1) capable of coping with a reduction in size and developing a sealing property without producing a squeeze-out at the time of attachment and using a material having a hardness range of 30 to 80 degrees (JIS durometer type A), wherein the requirement of W1/W0<0.9 is satisfied where the bonding width of a base part (1a) is (W0) and the width thereof at a position half a height from the bonding part of the base part (1a) to the tip end of a main bead part (2) is (W1), the requirement of 1.15<H/W0<1.80 is satisfied where the height from the bonding part of the base part (1a) to the tip end of the main bead part (2) is (H), the requirement of L/W0>=3 is satisfied where the length of the non-bonded portion of the base part (1a) around the cross-section thereof excluding the bonded portion is (L), and the compressibility of the gasket when compressed is 13.5% or higher.

Abstract: A seal ring for sealing an annular clearance between two members, which are made rotatable relative to each other. The seal ring is provided with a relief 5 throughout the circumference of a sliding face side to confront the side wall face 72 of an annular groove 71. This relief 5 is set to have a radially smaller width in the vicinity of a separate portion 2 and a radially larger width at a position apart from the separate portion 2, and the portion of the relief 5 to transit from the narrower portion to the wider portion is set to have a gradually changing width.

Abstract: To prevent the number of parts from being increased due to a trigger plate in a damper with trigger plate, a damper which is formed by interposing a sleeve and an elastic body between a hub fitted to a rotating shaft and an annular mass body disposed at the outer peripheral side of the hub, is characterized in that a magnetized trigger plate is integrally fitted, at specified pitch in the circular direction, to one end part of the sleeve, and the sleeve is fitted to the outer peripheral side of the hub or the inner peripheral side of the annular mass body.

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: To secure stability of the stacked sealing devices, a magnetic encoder-equipped sealing device has the slinger attached to either of two relatively rotating members and the lip seal attached to the other, the slinger has a magnetic encoder at one end face in the axial direction, the lip seal is formed by attaching a seal lip to an attachment ring and is slidably in contact with the slinger, an adhesion prevention projection, formed from a rubbery elastic body, is provided on the other end face in the axial direction of the attachment ring to prevent mutual adhesion of sealing devices when they are stacked, and the adhesion prevention projection (7) has a tapered cross-sectional shape in which an inner peripheral side-face (7a) of the projection (7) tilts relative to a rotation axis (O) at an angle greater than the tilt angle of an outer peripheral side-face (7b).

Abstract: A sliding portion between a seal lip (7) and the circumference of a shaft (3) is made of a sliding face (10) so that the facial pressure at the initial action time can be lowered to suppress the proceeding of the wear of the seal lip (7) thereby to elongate the lifetime of a sealing device (1). Moreover, screw ridges (12) are formed from an atmospheric side slope (11) to a sliding face (10) so that satisfactory sealing properties can be exhibited initially and endurably for a long time.

Abstract: In a sealing device (1) formed by combining a seal member (11) and a slinger (31), the seal member (11) has a first side lip (19) slidably in close contact with an axial end surface (33a) of the slinger (31), and a second side lip (20) arranged closer to an object of sealing than the first side lip (19) at the outside of the first side lip (19), wherein, in order to minimize torque generated during the sliding as much as possible, the second side lip (20) is shaped so as to have smaller interference allowance than that of the first side lip (19), or the second side lip (20) may be formed as a labyrinth structure in non-contact with the axial end surface (33a) of the slinger (31) with the interference allowance being set to zero.

Abstract: There is provided a seal ring that makes it possible to improve attachability and sealability. The seal ring 1 is separated from each other in one area and has a shape with ends, is inserted in an annular groove in a shaft by temporarily moving both the fittable ends 3 and 4 away from each other, and thereby seals an annular gap formed between the shaft and a housing that has a shaft hole into which the shaft is inserted. The seal ring is configured such that: one of both the ends 3 and 4 has a projection 31 projecting in the direction of the circumference of the seal ring; the other end 4 has a recess 42 used in combination with the projection 31. The projection 41 and the recess 42 are fitted together while slid against each other, thereby bringing both the ends 3 and 4 into contact with each other.

Abstract: A silicone rubber composition, which comprises 100 parts by weight of a vinyl group-introduced methylfluoroalkylvinyl-based silicone rubber obtained by copolymerization of a dimethylsiloxane copolymerization unit as the main component with 5-50% by mole of a methylfluoroalkylsiloxane copolymerization unit, and 0.2-8 parts by weight of an organic peroxide. When silica is used as a filler, it is desirable to use a surfactant for silica, and water at the same time. The present silicone rubber composition can give distinguished low-temperature characteristics and blister resistance, and thus can be used for seal materials directed to high-pressure hydrogen gas storage tanks, for example, to storage under 70 MPa, and particularly as suitable vulcanization-molding materials for O-rings, packings, gaskets, oil seals, valves, etc. High-pressure gases for storage are not limited only to hydrogen gas, but also to oxygen gas, nitrogen gas, helium gas, etc. likewise.

Abstract: A resin lip type seal (1) capable of increasing safety against rupture by reducing the rigidity of a plate-like lip (4) bent about the tip point A of a roughly wedge-shaped recessed part (8) to reduce stress concentration at the point A, suppressing the lowering of sealability due to a reduction in the creep of the lip, and increasing the follow-up capability of the lip to the eccentricity of its axis. Slits are formed in the slidable contact surface (41) of the plate-like lip (4) or/and the anti-slidable contact surface (42) thereof. Slits (7) are also formed in the sloped slidable contact surface (21) of the inner lip (2) of the seal.

Abstract: To prevent breakage by abnormal deformation when seal function of a seal section becomes ineffective to cause pressurized liquid remaining in the liquid chamber to be lost, a metallic bellows-type accumulator having a metal bellows, a bellows cap, an outer gas chamber and an inner liquid chamber, in a shell is structured to have a bellows constructed such that, when pressure in the liquid chamber (12) is further reduced after the bellows cap (31) is brought into contact with an oil port (4), surface contact sections (35) are formed on the metal bellows (3) and a curvature radius of U-shaped sections (3A) of crest portions (32) at the outer diameter side is reduced, and a curvature radius of U-shaped sections (3A) of root portions (33) at the inner diameter side is enlarged.

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: To provide a resin lip type seal having first inner and outer peripheral seal lips slidably contacting with an operation member and a fixed member and a second inner peripheral seal lip formed at the second sealed fluid side, wherein second inner peripheral seal lip is not forcibly bent and reduction in fastening due to creep can be compensated, a second inner peripheral seal lip (14) is formed in a plate-shape to extend obliquely in an inner peripheral direction toward the second sealed fluid side (B) so that an inner peripheral side end portion (15) slidably contacts with a shaft (2), and an outer peripheral side end portion (16) contacts with a taper surface (52) formed on a housing (3) or an installation member (5) of the housing (3), whereby contact surface pressure in the inner peripheral direction acts on the inner peripheral side end portion (15).

Abstract: A magnetic encoder, which is formed annularly of a magnetic rubber material, is magnetized to be multipolar in the circumferential direction and has a detected surface read by a magnetic sensor, is provided with a three-dimensional shape (3) such as annular steps with a lower surface portion between the higher surface portions at outer and inner circumferential sides, protrusions or notches provided radially, concentrically, in a grid shape, or in a logo pattern, on the detected surface (2), in order to reduce an area which tends to be scratched in the detected surface (2) and to make a scratch inconspicuous when the detected surface (2) is scratched, thereby preventing a significant scratch on the detected surface (2) and make a scratch inconspicuous even if scratched, to prevent reduction in a product value.

Abstract: A hydrogenated NBR composition, which comprises 100 parts by weight of a blend of a hydrogenated NBR having an acrylonitrile content of 25-44% by weight and an iodine number of 32-65, with such an amount of an NBR as to make the iodine number of the blend of 40-160, 2-23 parts by weight of an ester-based plasticizer, and 0.5-10 parts by weight of an organic peroxide, preferably which further contains 0.5-10 parts by weight of a polyfunctional, unsaturated compound, has a distinguished cost performance because of blending an expensive hydrogenated NBR with a cheap NBR, can give cross-linked products having a distinguished oil resistance (resistance to such oil as No. 3 oil and other general-purpose, commercially available engine oil, etc.) and a distinguished fuel oil resistance (resistance to such fuel oil as fuel oil C, and other general-purpose, commercially available gasoline, etc.

Abstract: To prevent grease applied to seal lips of sealing device from adhering to an attaching ring of an adjacent sealing device when the sealing devices are stacked in the axial direction, a sealing device (1) comprising seal lips (12, 13) made of a rubber-like elastic material and integrally provided on an attaching ring (11) has a projection (17) made of a rubber-like elastic material and provided at an outer periphery of the attaching ring (11) so that the projection (17) serves as a retention portion to contact with the attaching ring (11) of the adjacent sealing device (1) at the side to which the seal lips (12, 13) are directed when the sealing devices (1) are stacked, whereby desired gaps (?1, ?2) are retained between grease (G) applied to the sealing lips (12, 13) and the attaching ring (11) of the adjacent sealing device (1).

Abstract: To provide a sealing device in which a spring retainer portion integrally provided on a metal ring is neither worn away nor damaged, whereby it is made possible to achieve an easy production and a cost reduction, a sealing device is constructed by a cylindrical metal ring, a seal lip provided on one end of the metal ring and made of a rubber-like elastic material, a spring retainer portion provided on the other end of the metal ring, and a spring seated on the spring retainer portion, and the spring retainer portion is provided with an engaging means for preventing a rotating motion of the spring.

Abstract: To provide a seal structure which has a seal member integrally formed on a flexible wiring board without peeling off an insulating layer (top coat) of the flexible wiring board, has excellent sealing performance and can be manufactured at a low cost, the seal structure is composed of a housing, to which the flexible wiring board is inserted, and the seal member, which is integrally formed with the flexible wiring board and seals a gap between the housing and the flexible wiring board, the flexible wiring board is composed of a base FPC composed of an elastic material, a patterned copper foil and an adhesive layer, conductive electromagnetic shielding layers formed on surfaces of the base FPC, and insulating layers covering surfaces of the electromagnetic shielding layers, and the seal member is integrally formed directly on the insulating layers by using a self-adhesive liquid rubber.

Abstract: Case 10 is characterized by providing a pair of mutually facing surfaces, and a pair of side surfaces which join that pair of surfaces, opening 11 which is the entrance is formed on one of the surfaces 10a of the opposing pair of surfaces, while the opening 12 which is the exit is formed on the other surface 10b, and spaces S1 and S2 are provided between one surface 10a and the hollow fiber membrane stack 20, and between the other surface 10b and the hollow fiber membrane stack 20 in the entire domain in the direction from one side extreme of case 10 to the other side extreme, with the exception of the part where sealing and fixing devices 31 and 32 are provided, moreover, no space is configured between the pair of side surfaces and the hollow fiber membrane stack 20.