40results about How to "Improved seal durability" patented technology

It is intended that the rotation resistance is decreased while the durability and seal performance are kept in the rolling bearing unit with seal ring.

The most thin wall-thickness portion 30 is provided in the vicinity of the base end of the seal lip 22a projecting laterally in sliding contact with the mating surface. The most thick wall thickness portion 31 is provided adjacent to the most thin wall thickness portion 30 on the tip end side. The thickness is gradually decreased from the most thick wall thickness portion 31 to the tip end. Further, the ratios of thickness in the respective portions 22a are properly controlled.

A holder for magnetic transfer is formed by a chamber base and a chamber body which are moved toward and away from each other and form therebetween an inner space in which a master information carrier and a slave medium are accommodated and held in close contact with each other. The holder is provided at different parts with a first sealing portion for sealing the inner space between the chamber base and the chamber body and a second sealing portion allowing the pressing faces of the chamber base and the chamber body to move toward each other to press the master information carrier and the slave medium against each other with the inner space kept sealed.

A weather strip has a trim part 5 to be attached to a peripheral part of a door opening corresponding to a door and a sealing part projecting from the trim part 5 and having a hollow part. The weather strip is obtainable by coating a treatment liquid containing a simple sulfur, a sulfur compound, or both of the simple sulfur and the sulfur compound on an outer surface of the sealing part of an extruded, non-vulcanized, and non-foamed intermediate molded body and vulcanizing and foaming the intermediate molded body by passing the intermediate molded body through a heating zone. By the above production steps, in the trim part, a skin layer that is harder than a sponge layer is formed on the sponge layer and a superficial part of the trim part. The skin layer has a width of 10 mm or more in a width direction and a uniform thickness set in a range of 0.04 mm to 0.15 mm.

The present invention provides a plunger-type master cylinder capable of reducing lost strokes and preventing residual pressure without impairing the durability of a seal ring (70). The piston (91) of the master cylinder is provided with a recess (93) on the outer peripheral surface, and an overflow port (900) is provided in the recess (93). The seal ring (70) is provided with a seal joint (70s) on the inner periphery of the front end portion of the inner peripheral lip (701). The sealing junction (70s) is located at the opening of the overflow port (900) on the side of the piston (91) when the brake is not working. The distance from the sealing joint (70s) to the overflow opening (900) is small. Furthermore, the sealing ring (70) is provided with first and second protrusions (7006, 7002) on the inner peripheral surface of the inner peripheral lip (701), so that the working fluid on the inner peripheral side of the inner peripheral lip (701) can be ensured. flow path.

A sealed honeycomb structure may include porous walls dividedly forming inlet cells and outlet cells extending from an end surface of an inlet side to an end surface of an outlet side, inlet and outlet side sealing portion 5b, and an inlet side sealing portion, wherein at least one outlet cell is a reinforced cell where a reinforcing part 6 for reinforcing the outlet cell 2b is formed at at least one corner portion 21a at which the walls on a cross-section vertical to an extending direction of the cell cross each other, wherein the inlet cell is a non-reinforced cell where the reinforcing part is not formed at all the corner portions at which the walls on the cross-section vertical to the extending direction of the cell cross each other, and wherein the reinforcing parts 6 of the reinforced cells 22 are formed at a section of the honeycomb structure from the end surface of the outlet side in the extending direction of the cell.

Disclosed is a glass composition which is adapted to use in providing a hermetic seal between a metal and a ceramic, a metal and a metal, and a ceramic and a ceramic, to form crystallized glass having high strength and high thermal expansion which allow it to be used at high temperatures of 950° C. and over. The glass composition is substantially free of alkali metals, and contains, as calculated as oxide, 15-30 mass % of SiO₂, 0-5 mass % of Al₂O₃, 20-35 mass % of B₂O₃, 10-25 mass % of CaO, 25-40 mass % of MgO, 3-8 mass % (3.0% excluded) of ZrO₂, and 0-3 mass % of CeO₂, wherein the crystallized glass which is formed by firing a glass powder made of the glass composition at a temperature of 850-1050° C. has a thermal expansion coefficient of 90-110×10⁻⁷/° C. at 50-550° C. and flexural strength of not less than 80 MPa.

PROBLEM TO BE SOLVED: To keep the seal durability of a valve seat without any difficult work of excellent accuracy in machining the valve seat, and to reduce the operation force in opening a valve. SOLUTION: In a this valve device, a disk bush 10 to be integratedly connected to a boss part is arranged between a slide key 5 provided in a rod 4 and a boss part 9 of a valve element 3. A washer 7 is arranged around the disk bush 10, and the disk bush 10 and the washer 7 form a cylindrical assembly when they are closely fitted to each other. A bush 6 having a notch 6c in which the disk bush 10 can be locally projected on a seat ring 2a side is arranged around the washer 7. While the disk bush 10 is projected from the notch, the valve element 3 is moved straight. While the disk bush is retracted from the notch, the cylindrical assembly is turnably supported by the bush 6, and the valve element 3 is turned together with the rod 4.

A seal body that is used for gas seal includes a seal main body in which a recessed groove is formed by arranging a pair of lips so that the lips face each other; an elastic body that is inserted in the recessed groove and expands the lips; and a rigid body that is installed in the elastic body, and restricts deformation of the elastic body, due to narrowing of the recessed groove, within an elastic deformation range.

The invention discloses a metal-air fuel cell with a self-sealing cathode easy to fix. The metal-air fuel cell comprises a battery shell, a metal anode assembly, a cathode, a cathode pressing plate, an anode leading-out piece and a cathode leading-out piece. The battery shell comprises two opposite open type end faces, a first sealing groove is formed in a frame of each open type end face, a firstsealing piece is arranged in each first sealing groove, and a cathode maintaining structure is arranged in each open type end face. The metal anode is inserted into the battery shell through the anode through groove, and the anode base is fixed to the end face of the battery shell. The cathode pressing plate covers the open end surface and is clamped through a buckle, the cathode pressing plate is of a frame structure, a second sealing groove is formed in the outer frame of the cathode pressing plate, a second sealing piece is arranged in the second sealing groove, and the cathode is clampedbetween the first sealing piece and the second sealing piece. And the open end surface is hermetically connected with the cathode through a sealing groove and a sealing piece. The cathode material disclosed by the invention can be simply and quickly fixed, can be used for multiple times, and is durable in sealing.