Abstract: A grease composition, which comprises a mixture of mutually incompatible thickener-containing non-fluorine-based base oil and thickener-containing fluorine-based base oil, the base oils being in a morphological structure, where one of the base oils is homogeneously dispersed in a particulate state in the other base oil, can be produced by kneading the mixture through a three-roll mill at least twice. By forming a morphological structure, one of the mutually incompatible non-fluorine-based base oil and fluorine-based base oil is homogeneously dispersed in a particulate state in the other base oil, that is, by forming a microscopically dispersed state, the following effects can be obtained (1) less oil separation (smaller degree of oil separation) at elevated temperatures, (2) distinguished shearing stability, (3) low and stable friction coefficient, and (4) less abrasion.

Abstract: A bi-directional dynamic seal advantageously provides for the return of captured lubricant to the lubricant side regardless of a direction of relative rotation between the seal and the shaft. The seal utilizes a pattern of symmetrical pumping elements to facilitate the hydrodynamic pumping of the captured lubricant in response to the relative rotation. The symmetrical pumping elements have ending points that stop short of the seal edge of the seal. The seal may utilize secondary pumping elements that communicate with the primary pumping elements to capture lubricant that is not captured by the primary pumping elements.

Abstract: A sealing device includes a side lip contacting with a surface angled to the axis. To optimize the cross sectional shape of the side lip, T1/T3 is set to not less than 0.5 and less than 0.8 and L2/L1 is set to 0.2 to 0.4, where the thickness of the lip end (5c) of the side lip (5) is T1, the thickness of the lip base (5a) is T3, the length of the lip end (5c) is L1, and the length of the lip base (5a) is L2. Further, in a sealing device which includes a side lip (5) contacting with a surface angled to the axis over its contact width, the maximum value of the surface pressure in the side lip (5) is set at the most leading end (5d) of the lip.

Abstract: A seal structure provided in an inner mechanism of an automatic shift gear includes: a housing; a piston; a canceller; a return spring; an opponent member which is disposed opposite to a centrifugal canceller chamber in the canceller and forms an oil path between the opponent member and the canceller; an outer circumferential seal unit which is provided on an outer circumferential portion of the canceller and comes into contact with the piston to seal an operating oil supplied to the canceller chamber; and a second outer circumferential seal unit which is provided on the outer circumferential portion of the canceller and comes into contact with the opponent member to seal an operating oil flowing through the oil path, in which the second circumferential seal unit has an axial seal shape which comes into contact with an inner circumferential shape of a cylindrical shape provided on the opponent member.

Abstract: To prevent plastic deformation of a bellows due to a pressure difference between inner and outer sides of the bellows in an outside gas type or inside gas type accumulator, a disc-like gasket is held in a floatable state to a surface close to a stay in a bellows cap by a gasket holder, so that, the disc-like gasket moves together with the bellows cap at a steady operation time, the disc-like gasket moves together with the bellows cap to contact with an end surface portion of the stay, thereby closing the liquid chamber at a zero-down time, and the bellow cap moves toward a position where liquid pressure and gas pressure balance while the disc-like gasket keeps contacting with the stay due to a difference of pressure receiving areas in both the surfaces when the liquid in the liquid chamber is thermally expanded at a zero-down time.

Abstract: A dynamic shaft seal assembly is provided including a dynamic seal for engaging a rotary shaft. The dynamic seal includes a base portion that is mounted within a casing and has an axially extending barrel portion extending from a radially inner end of the base portion. The axially extending barrel portion terminates in a radially extending leg portion which extends inwardly from an end of the axially extending portion. A generally conically shaped seal portion extends from an end of the radially extending portion and the seal portion includes a radially inner face engaging the shaft and a radially outer face having a stiffening bead integrally formed thereon. The stiffening bead reduces the seal's propensity for “bell mouthing” while the axially extending barrel portion provides improved shaft followability for the dynamic seal.

Abstract: An optical disc apparatus, comprising: a tray 20 being provided to be movable between a first position where an optical disc can be loaded therein and a second position where information is readout from said optical disc loaded; and a housing 10 supporting said tray to be slidable, and including an electronic circuit board in a part thereof, wherein the tray mounts thereon various kinds of parts including a pickup 30, a disc motor 31, and a control portion for controlling them, and is electrically connected between the electronic circuit board of the housing through a flexible cable, which is provided under condition of being bent within the housing, wherein a reinforcing sheet shaped 50 into waveform at the end portion thereof for dispersing the stresses is adhered in a part of a bent region of the flexible cable, which moves accompanying with movement of the tray when the tray moves between the first position and the second position.

Abstract: A hydrogenated NBR composition, which comprises 100 parts by weight of a hydrogenated NBR having an acrylonitrile content of 25-44% by weight and an iodine number of 32-65, or a blend of the hydrogenated NBRs themselves, 2-23 parts by weight of an ester-based plasticizer, and 0.5-10 parts by weight of an organic peroxide, and preferably further contains 0.5-10 parts by weight of a polyfunctional unsaturated compound, can give molding products having distinguished oil resistance and fuel oil resistance as well as distinguished heat resistance and cold resistance, and thus can be used as suitable molding materials for intake manifold gaskets of automobile engines.

Abstract: To eliminate pins for specifying a vertical position of a metal fixture from a dust cover forming mold to suppress variation in product shape caused by wear of the pins, the ring-shaped metal fixture (1) is embedded in the dust cover (2) to fix the dust cover (2) at an installation position, inner diameter teeth (6) are formed integrally at one end in the axial direction of an outer diameter tube section (4) via a bend (5), the metal fixture (1) is embedded in the dust cover (2) so that one end (5a) in the axial direction of the bend (5) is set at axially the same position as one end face (2a) in the axial direction of the dust cover (2), and groove-like communication sections (8) radially penetrating the bent section (5) are formed in a radial shape at the one end (5a).

Abstract: To restrain abnormal deformation of a bellows due to a pressure difference between the inside and outside thereof, an outside gas type accumulator includes a pressure difference regulation mechanism (21) having a movable plate (22) supported by a coil spring (23) on the oil port (4) side of a bellows cap (8), the plate (22) moves together with the cap (8) in a state of being supported by the spring (23), during normal operation, the plate (22) moves together with the cap (8) to be brought into contact with a seal (13) at zero-down time, and the plate (22) keeps contact with the seal (13) and the cap (8) moves to a position where liquid pressure and gas pressure balances while compressing the spring (23) when the liquid and the charged gas expand thermally.

Abstract: A sealing device having a dust filter, in which sliding torque due to the dust filter is reduced with dust sealing performance of the dust filter maintained at a high level. The sealing device is provided with a seal lip (12) mounted to a non-rotating housing (200) and made to be in slidable close contact with a rotation-side member (2), and the sealing device is also provided with the dust filter (16) located closer to the atmosphere (A) than the seal lip (12) and having an inner diameter section (16a) which is made to be in slidable close contact with the outer peripheral surface of the rotation-side member (2). Cutouts (16b) are formed at predetermined circumferential intervals in the inner diameter section (16a) of the dust filter (16), and the deepest sections of the cutouts (16b) have an appropriate allowance for fastening to the outer peripheral surface of the rotation-side member (2).

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: An oil strainer in which pressure loss by a turbulent flow in a case (10) is reduced as much as possible. The oil strainer has the case (10) having an inflow opening (112) and an outflow opening (122) that are at positions separated from each other, and also has a filter member (20) provided so as to partition the inner space of the case (10) into a space (SI) on the inflow opening (112) side and a space (SO) on the outflow opening (122) side. A guiding surface (13) is provided in the case (10), and the guiding surface (13) has dam-like ribs (113, 123), extends via a position behind the outflow opening (122) when viewed from the inflow opening (112) side, and converges the flow of oil toward the outflow opening (122).

Abstract: A nitrile rubber solution prepared by dissolving and dispersing into an organic solvent a nitrile rubber composition comprising 100 parts by weight of nitrile rubber, 40 parts by weight or more of carbon black having a DBP oil absorption amount of 30-100 ml/100 g (according to ASTM D1765-91), 15-100 parts by weight of silica having particle sizes of 0.01-0.1 ?m, 0-40 parts by weight of other inorganic filler than the carbon black and silica, and 5-20 parts by weight of an organic peroxide, and preferably further containing 2-10 parts by weight of a silane coupling agent is applied to an adhesive layer on one side or both sides of a metallic sheet, followed by vulcanizing the coated layer, thereby forming a rubber layer.

Abstract: Cross-linked rubber obtained from a rubber composition, which comprises 100 parts by weight of EPDM, 5-120 parts by weight carbon black, 70-150 parts by weight of fine bituminous powder, and 0.2-8 parts by weight of an organic peroxide, has distinguished heat resistance and sealability, and can suppress blister generation due to pressure changes when used in contact with carbon dioxide, and is specifically distinguished foaming-resistance characteristics due to abrupt pressure reduction of carbon dioxide, which are the necessary characteristics of seal material for carbon dioxide refrigerant, and also distinguished compression set characteristics, which determine the product life at elevated temperatures, and thus is suitable for use as carbon dioxide seal materials, such as O rings, packings, gaskets, oil seals, valves, etc.

Abstract: To perform exhaustion to regulate pressure in a case with surely recovering liquid in the case without draining it even when the pressure in the case rises rapidly, a breather for regulating internal pressure in a case by performing exhaustion to the outside when the internal pressure exceeds predetermined pressure thereby reducing the internal pressure, includes an exhaust passage leading from the inside of the case to the outside; a liquid recovery passage for recovering liquid discharged from the inside of the case to the inside of the case; and a discharge valve means which opens when the internal pressure in the case exceeds the predetermined pressure, wherein the liquid recovery passage is provided at the atmosphere side beyond the discharge valve means, and a recovery valve means is provided in the liquid recovery passage.

Abstract: A gasket in an integrated double-layered structure comprising an outer layer and an inner layer enclosed by the outer layer, in which the outer layer is a low-hardness rubber layer having a JIS A hardness of 40-70, and the inner layer is a high-hardness rubber layer having a JIS A hardness of 80-100, where a ratio h/h0 of height h of the inner layer to height h0 of the outer layer is preferably 0.3-0.8, and ratio d/d0 of height d of the inner layer to width d0 of the outer layer is preferably 0.5-0.8 in the longitudal cross-section as view from the width direction of the gasket, has a low reaction force, and distinguished sealability and insertibility, and used as inserted between two members, one of which has a groove for insertion.

Abstract: To minimize thermal influence when integrally forming the sealing member on a flexible wiring board, a sealing structure includes a housing, a flexible wiring board inserted therethrough, and a sealing member integrally formed with the flexible wiring board to airtightly seal a gap between the housing and the flexible wiring board, the flexible wiring board includes a base substrate made of an elastic material, an electrically conductive printed wiring layer formed on a surface of the base substrate, and a cover film covering a surface of the printed wiring layer, and the printed wiring layer which crosses the sealing member is formed as a plurality of divided print wiring layers at only a crossing region with the sealing member and its vicinity.

Abstract: A rollback seal, which is used in a space between a piston and a housing of a hydraulic brake configured to brake a wheel by clamping a disc rotor fixedly attached to the wheel, is arranged in an annular groove of the housing, has a substantially rectangular sectional shape, has an annular recess formed in one end face thereof at the side where hydraulic pressure acts on the piston, and has a chamfered section formed at a piston side corner of the other end face thereof at the opposite side to that where the recess is formed, thereby to reduce total weight of brake system, secure sufficient amount of rollback at low temperature, and reliably return a piston from brake position to release position with improved sealing characteristics over a longer service life.

Abstract: The invention provides a method for manufacturing a seal integrally provided with conducting members, the method capable of suppressing generation of burrs even if the conducting members have complicated structures, e.g., when the conducting members are laid on each other while displaced from each other. In the method for manufacturing the seal provided with the plurality of FPCs 21, 22 and 23 laid on each other, while displaced from each other, leakage preventing portions 31, 32, 33, and 34 for preventing leakage of a seal material from a cavity C are formed in a portion of a gap formed between the FPCs 21 and 23 and at portions of surfaces of the FPC 23 and FPC 22 before the FPCs 21, 22, and 23 are disposed in a mold. In this way, it is possible to prevent the leakage of the seal material in molding a seal member 11.