Abstract: A high-pressure tank comprises a liner, a strengthening layer including a first helical layer and a first hoop layer each including a carbon fiber, and a protective layer including a second helical layer and a second hoop layer each including a glass fiber, in this order. The high-pressure tank is provided with a stress-generating portion, a reinforcement layer includes a first area ? overlapping the stress-generating portion in a stacking direction and a second area ? that is an area except for the first area, and a one-round portion including a final crossing portion at an end of winding of the glass fiber constituting the second hoop layer overlaps the second area in the stacking direction.

Abstract: A fuel cell separator includes a separator main body having a first surface and a second surface, and a first seal member disposed on the first surface. When a region on the first surface of the separator main body corresponding to an electrode member disposed on the second surface is defined as a power generation region, and a region on the first surface of the separator main body corresponding to an in-cell seal member is defined as a seal region, a displacement/vibration reducing member made of polymer is disposed at a part of the seal region. The displacement/vibration reducing member includes multiple protrusions and a coupling portion. When viewed in plan view, an axis line connecting the centers of the figures of the adjacent protrusions does not coincide with a center line passing through the widthwise center of the coupling portion. The coupling portion has a gate cut mark.

Abstract: A high-pressure tank comprises a liner, a strengthening layer including a first helical layer and a first hoop layer each including a carbon fiber, and a protective layer including a second helical layer and a second hoop layer each including a glass fiber, in this order. The high-pressure tank is provided with a stress-generating portion, a reinforcement layer includes a first area ? overlapping the stress-generating portion in a stacking direction and a second area ? that is an area except for the first area, and a one-round portion including a final crossing portion at an end of winding of the glass fiber constituting the second hoop layer overlaps the second area in the stacking direction.

Abstract: A high-pressure tank comprises a liner, a strengthening layer including a first helical layer and a first hoop layer each including a carbon fiber, and a protective layer including a second helical layer and a second hoop layer each including a glass fiber, in this order. The high-pressure tank is provided with a stress-generating portion, a reinforcement layer includes a first area ? overlapping the stress-generating portion in a stacking direction and a second area ? that is an area except for the first area, and a one-round portion including a final crossing portion at an end of winding of the glass fiber constituting the second hoop layer overlaps the second area in the stacking direction.

Abstract: A fuel cell separator includes a separator main body having a first surface and a second surface, and a first seal member disposed on the first surface. When a region on the first surface of the separator main body corresponding to an electrode member disposed on the second surface is defined as a power generation region, and a region on the first surface of the separator main body corresponding to an in-cell seal member is defined as a seal region, a displacement/vibration reducing member made of polymer is disposed at a part of the seal region. The displacement/vibration reducing member includes multiple protrusions and a coupling portion. When viewed in plan view, an axis line connecting the centers of the figures of the adjacent protrusions does not coincide with a center line passing through the widthwise center of the coupling portion. The coupling portion has a gate cut mark.

Abstract: A high-pressure tank comprises a liner, a strengthening layer including a first helical layer and a first hoop layer each including a carbon fiber, and a protective layer including a second helical layer and a second hoop layer each including a glass fiber, in this order. The high-pressure tank is provided with a stress-generating portion, a reinforcement layer includes a first area ? overlapping the stress-generating portion in a stacking direction and a second area ? that is an area except for the first area, and a one-round portion including a final crossing portion at an end of winding of the glass fiber constituting the second hoop layer overlaps the second area in the stacking direction.

Abstract: A method for manufacturing a grinding wheel which is formed by fitting a cylindrical grindstone chip including abrasive grains to a base metal formed to be of a columnar shape, comprises an adhesive agent applying step, a linear guide member arranging step for arranging and attaching a plurality of linear guide members on at least one of the outer peripheral surface of the base metal and the inner peripheral surface of the cylindrical grindstone chip, in parallel with a rotation axis of the base metal and with an equal distance separated in a circumferential direction from one another and a base metal and grindstone chip fitting step for fitting the base metal and the cylindrical grindstone chip to each other by relatively moving the base metal and the cylindrical grindstone chip, interposing therebetween the plurality of linear guide members arranged and attached with the equal distance separated from one another.

Abstract: A method for manufacturing a grinding wheel which is formed by fitting a cylindrical grindstone chip including abrasive grains to a base metal formed to be of a columnar shape, comprises an adhesive agent applying step, a linear guide member arranging step for arranging and attaching a plurality of linear guide members on at least one of the outer peripheral surface of the base metal and the inner peripheral surface of the cylindrical grindstone chip, in parallel with a rotation axis of the base metal and with an equal distance separated in a circumferential direction from one another and a base metal and grindstone chip fitting step for fitting the base metal and the cylindrical grindstone chip to each other by relatively moving the base metal and the cylindrical grindstone chip, interposing therebetween the plurality of linear guide members arranged and attached with the equal distance separated from one another.

Abstract: There are disclosed a tank having a structure which achieves both a burst strength and a fatigue strength, and a manufacturing method of the tank. In order to realize this, in a tank comprising a liner, and an FRP layer including a hoop layer and a helical layer formed by winding fibers around the outer periphery of the liner, at least an innermost helical layer is formed as a smooth helical layer. When the smooth helical layer, i.e., a helical layer which does not have any unevenness or which has only little unevenness is formed, the unevenness can be prevented from being transferred to the hoop layer adjacent to the helical layer. When structural bends (undulations) of the fibers of the hoop layer are suppressed, a fatigue strength of the fibers themselves can be enhanced.

Abstract: A tank that includes layers of fiber reinforced plastics (FRP) formed by alternately winding hoop and helical bundles of fiber over its outer surface. The winding produces stepped portions, i.e. unevenness, in a helical layer positioned as the innermost layer. Such unevenness affects an outer layer (especially a hoop layer) directly adjacent to the innermost helical layer and lowers fatigue strength of the adjacent outer layer. In order to prevent this fatigue strength decrease, the bundle of fiber used for the innermost helical layer has a smaller sectional area than the bundles used for the outer layers. Consequently, decreasing the sectional area of the innermost helical bundle decreases the stepped portions, which, in turn, decreases the transfer of unevenness to the outer layer (especially a hoop layer) directly adjacent to the helical layer. As a result, fatigue strength of the adjacent outer layer (especially a hoop layer) increases.

Abstract: There is avoided a phenomenon where owing to an influence of a stepped portion of the surface of a helical layer positioned in an inner layer of an FRP layer, a fatigue strength of a layer (especially, a hoop layer) adjacent to the outside of the helical layer lowers. To realize this, there is disclosed a tank comprising a liner, and an FRP layer constituted of hoop layers and helical layers alternately formed by winding fiber bundles around the outer periphery of the liner, and in at least one of a plurality of helical layers positioned in an inner layer of the FRP layer, a sectional area of the fiber bundle constituting the helical layer is set to be smaller than that of the fiber bundle constituting another layer formed outside the helical layer. When the helical layer is formed by using this fiber bundle having the small sectional area, unevenness in the helical layer becomes small, and the unevenness can be prevented from being transferred to the other layer (e.g.

Abstract: There are disclosed a tank having a structure which achieves both a burst strength and a fatigue strength, and a manufacturing method of the tank. In order to realize this, in a tank comprising a liner, and an FRP layer including a hoop layer and a helical layer formed by winding fibers around the outer periphery of the liner, at least an innermost helical layer is formed as a smooth helical layer. When the smooth helical layer, i.e., a helical layer which does not have any unevenness or which has only little unevenness is formed, the unevenness can be prevented from being transferred to the hoop layer adjacent to the helical layer. When structural bends (undulations) of the fibers of the hoop layer are suppressed, a fatigue strength of the fibers themselves can be enhanced.

Abstract: A hydrogen tank liner material comprises a polyamide resin composition which comprises (A) a polyamide resin at 85-40 wt %, (B) a copolyamide at 5-30 wt % and (C) an impact-resistant material at 10-30 wt % with respect to the total weight of the polyamide resin composition. Preferably, the (B) copolyamide is PA6/66 and the (C) impact-resistant material is an acid-modified ethylene/?-olefin-based copolymer. A hydrogen tank liner material with excellent gas barrier properties and superior impact resistance even at low temperatures is obtained.

Abstract: A pressure vessel capable of securely sealing a mouth ring with a liner portion, and being manufactured at low costs. A boss seal part 112 is provided in a liner portion 11 of the pressure vessel, and an inner peripheral surface of a boss part 20 of a mouth ring 2 is covered with the boss seal part 112. A boss-side collar part 114 is provided in the boss seal part 112 so as to project outwardly, and a sealing member 4 composed of a resilient body is disposed in a space between an inner peripheral surface of the boss seal part 112 and an outer peripheral surface of the valve 3.

Abstract: An opening section of a tank projects to the inside of the tank. In the inwardly projecting section, a fitting projects to the inside of the tank, surrounding a substantially cylindrical column-like valve. Also, an inner circumferential wall projects to the inside of the tank so as to surround the fitting. Further, a metal ring is provided surrounding the inner circumferential wall, and a metal nut is attached from the end in the direction of the projection of the inner circumferential wall. The metal ring and the metal nut function as support members for supporting the inner circumferential wall and increase the quality of the seal between the inner circumferential wall and the fitting.

Abstract: A hydrogen tank liner material comprises a polyamide resin composition which comprises (A) a polyamide resin at 85-40 wt %, (B) a copolyamide at 5-30 wt % and (C) an impact-resistant material at 10-30 wt % with respect to the total weight of the polyamide resin composition. Preferably, the (B) copolyamide is PA6/66 and the (C) impact-resistant material is an acid-modified ethylene/?-olefin-based copolymer. A hydrogen tank liner material with excellent gas barrier properties and superior impact resistance even at low temperatures is obtained.

Abstract: A pressure vessel capable of securely sealing a mouth ring with a liner portion, and being manufactured at low costs. A boss seal part 112 is provided in a liner portion 11 of the pressure vessel, and an inner peripheral surface of a boss part 20 of a mouth ring 2 is covered with the boss seal part 112. A boss-side collar part 114 is provided in the boss seal part 112 so as to project outwardly, and a sealing member 4 composed of a resilient body is disposed in a space between an inner peripheral surface of the boss seal part 112 and an outer peripheral surface of the valve 3.

Abstract: An FRP drive shaft wherein the shaft body and the flanges are formed in a body and a method of manufacturing the same are disclosed. The shaft body is formed by winding a resin impregnated fiber on a mandrel having pins on its circumferential surface while hooking the fiber on the pins. The fiber is then circumferentially wound to form a hoop-like reinforcing band near each end of the shaft body. After the pins and end parts of the mandrel are removed, each end portion of the shaft body is expanded by a pressing mold to form a flange. After hot setting, the remaining part of the mandrel is removed.

Abstract: A sliding part produced by monomer casting. The sliding part consists of a bearing, a shaft which is rotatably or reciprocatably supported by and fitting into the bearing, and a resin lining formed on the bearing surface of the bearing. The resin lining is formed by pouring a low-viscosity monomer or prepolymer into the clearance between the bearing surface and the shaft and permitting the monomer or prepolymer to polymerize or cure in situ. The shaft is slidable on the resin lining.