Abstract: A method of connecting a resin hose to a metal pipe comprising the steps of: forming a fluororubber coating layer on an inner peripheral surface of the resin hose; forming a lubricating layer of a fluorine-containing lubricant on an inner peripheral surface of the fluororubber coating layer; and inserting an end portion of the metal pipe into an end portion of the resin hose formed with the lubricating layer. Fluorine atoms in a fluororubber molecular skeleton are hydrogen-bonded to hydroxyl groups introduced in a metal of the metal pipe and therefore the adhesion between the resin hose and the metal pipe is enhanced for improvement of the sealing property. Further, the lubricating layer facilitates the insertion of the metal pipe into the resin hose for the connection therebetween.

Abstract: A method of producing a fuel hose having superior adhesive reliability with superior initial adhesive strength between a tubular fluororesin inner layer and a thermoplastic resin outer layer and with restrained deterioration in adhesive strength after heat aging and immersion into fuel under severe conditions such as an inside of an engine compartment. The method includes plasma treatment on a peripheral surface of the tubular fluororesin inner layer, at least one treatment of water treatment and silane coupling agent treatment on the plasma treated surface and formation of the thermoplastic resin outer layer on the treated peripheral surface.

Abstract: A hose device for fuel transportation having superior methanol permeation resistance, methanol resistance, non-extractability with methanol, water resistance, heat resistance, pressure resistance, etc., when methanol is used as a fuel. The hose device for fuel transportation comprises a hose main body having a three-layer structure composed of an innermost layer made of a resin having methanol permeation resistance, an intermediate layer, and an outermost layer, and a quick connector mounted on the end portion of the hose main body. The aforementioned quick connector is composed of a housing section and a pair of O-rings. The aforementioned housing section is composed of a material having methanol permeation resistance, one end portion of the housing section is formed as an insert portion to be inserted into the aforementioned hose main body, and the other end portion is formed as a container portion for containing an engagement target member therein.

Abstract: A resin connector having: a generally cylindrical housing having a first end that is adapted to be inserted into a hose and constitutes an insert section and a second end that is adapted to house a male member to be engaged and constitutes a housing section; and a pair of first and second O-rings being mounted on an inner surface of the housing section of the housing, the first O-ring being disposed proximal to the insert section, and the second O-ring being disposed distal from the inset section, the housing being made of a cured resin composition satisfying the following conditions (A), (B) and (C), and the first O-ring being made of an elastomer satisfying the following condition (D): (A) the following condition (al) or (a2): (a1) a helium permeability at 80° C. is less than or equal to 5×10−10 cm3·cm/cm2·sec·cm-Hg; or (a2) a methanol permeability at 60° C. is less than or equal to 5 mg·mm/cm2/day; (B) a water permeability at 80° C.

Abstract: A hose device for fuel transportation having superior methanol permeation resistance, methanol resistance, non-extractability with methanol, water resistance, heat resistance, pressure resistance, etc., when methanol is used as a fuel. The hose device for fuel transportation comprises a hose main body having a three-layer structure composed of an innermost layer made of a resin having methanol permeation resistance, an intermediate layer, and an outermost layer, and a quick connector mounted on the end portion of the hose main body. The aforementioned quick connector is composed of a housing section and a pair of O-rings. The aforementioned housing section is composed of a material having methanol permeation resistance, one end portion of the housing section is formed as an insert portion to be inserted into the aforementioned hose main body, and the other end portion is formed as a container portion for containing an engagement target member therein.

Abstract: A rubber hose having a multilayer wall is formed of an inner layer of NBR type rubber having a high AN content, available at a low cost and highly impermeable to fuel and an outer layer of a rubber composition having a minimum Mooney viscosity of 25 to 65 at its curing temperature and highly resistant to flattening. Those layers are extruded and cured together without the aid of any mandrel owing to the inside diameter and wall thickness of the hose and the thickness of the outer layer which fall within specific ranges. This process enables the manufacture of a fuel hose having a high fuel impermeability at a low cost, while protecting its inner wall effectively from flattening during curing.

Abstract: A plasticizer having a specific SP value and a specific molecular weight is added to NBR having a specific AN content in an ultrahigh range, or a blend of such NBR and less than 25 percent by weight of PVC so that a good balance may be obtained between its amount and the AN content of the NBR. A fuel hose for a vehicle having an inner wall layer formed from such a rubber composition and an outer wall layer formed from a rubber material having ozone resistance or cure flatting resistance is provided. The rubber composition is of good fuel impermeability and low temperature properties and also has a high conductivity. The hose is of good fuel impermeability and low temperature properties and also has a high conductivity.

Abstract: A hydrogen fuel hose having a wall formed by an innermost layer of rubber cured by an agent not containing any metal oxide, or sulfur, and a metallic barrier layer formed in the wall surrounding it. The barrier layer may be a metal laminated layer. The hose is used for conveying e.g. a hydrogen fuel in a fuel-cell vehicle. The hose has a high impermeability to hydrogen gas and a high electric resistance, and does not cause any dissolution of ions in hot steam that may cause the pollution of the fuel-cell catalyst.

Abstract: A method for manufacturing a fuel transporting hose which is low in manufacturing costs and is superior in characteristics, including insertability, sealability and pull-out resistance. The method includes the steps of extrusion-molding an unvulcanized hose having fluoro rubber as an inner layer without using a mandrel, vulcanizing the unvulcanized hose so as to form a fuel transporting hose having a fluoro rubber inner layer, and forming a fluorine-modified silicone lubricating layer on the inner peripheral surface of the fluoro rubber inner layer.

Abstract: A method of connecting a resin hose to a metal pipe comprising the steps of: forming a fluororubber coating layer on an inner peripheral surface of the resin hose; forming a lubricating layer of a fluorine-containing lubricant on an inner peripheral surface of the fluororubber coating layer; and inserting an end portion of the metal pipe into an end portion of the resin hose formed with the lubricating layer. Fluorine atoms in a fluororubber molecular skeleton are hydrogen-bonded to hydroxyl groups introduced in a metal of the metal pipe and therefore the adhesion between the resin hose and the metal pipe is enhanced for improvement of the sealing property. Further, the lubricating layer facilitates the insertion of the metal pipe into the resin hose for the connection therebetween.

Abstract: In an electric blower, exhaust air discharged radially from a centrifugal fan is redirected to a motor drive section by a diffuser and a fan cover. The air passes from a ventilation opening on a motor frame and through a bracket to cool the motor drive section. A portion of the air from the centrifugal fan is bled off through exhaust openings without passing over the motor, whereby this portion remains cooler and cleaner than the air that passes over the motor. Air flows up a wand and then passes over the motor to cool the motor. This air passes through filters before being discharged. The portion of air that is bled off passes along a parallel path in the wand to agitate dirt, and to maintain the wand relatively cool. In one embodiment, some of the bled-off portion is discharged directly without passing along the wand.

Abstract: A relatively small amount of a plasticizer having an SP value of at least 8.8 and a molecular weight of at most 550 is added to blend rubber of NBR-PVC in which NBR has an AN content of from 43 to 50% by weight. The fuel impermeability and the low-temperature flexibility of the resulting rubber composition are improved to be comparable to those of FKM, and the amount of the plasticizer and its reaction product to be released from the rubber composition in fuel is reduced. Adding a controlled amount of carbon black to the rubber composition makes the composition have favorable electroconductivity. The rubber composition is formed into hoses or electroconductive hoses of low fuel permeation.

Abstract: A fuel transporting hose includes at least one layer of a rubber composition mainly comprised of a polymer blend which comprises: (A) an acrylonitrile-butadiene rubber (NBR) containing bound acrylonitrile in an amount (ACN amount) of 42 wt % to 52 wt %; (B) a polyvinyl chloride (PVC) having an average polymerization degree of 700 to 1400, wherein the component (A) and the component (B) are present in a weight ratio of (A)/(B)=90/10 to 65/35 in the polymer blend, wherein the polymer blend has a Mooney viscosity of 20 to 45 at a vulcanization temperature.

Abstract: A fuel hose comprises a single layered or multi-layered tubular rubber body and a thin film resin layer formed on the inner circumferential surface of the innermost layer of the tubular rubber body. The resin layer is formed of a resin such that an amount of permeation of 10% ethanol-mixed gasoline is 2 mg/cm2/day (at 60° C.) or less when the thickness of the resin layer is 0.1 mm. A preferred example of such a resin is EVOH with an ethylene content of from 35 to 50 mol % or polybutylene aromatic ester. The fuel hose has necessary flexibility and shows excellent impermeability even to an alcohol-mixed gasoline.

Abstract: A vacuum cleaner wherein a hose, a pipe and a suction nozzle, which are connected to a vacuum cleaner main body incorporating therein a motor fan, are formed with a suction air passage as well as an exhaust air passage for making air exhausted from the motor fan circumfluently flow. The pipe is composed of an inner cylindrical portion having a substantially circular section and forming the suction air passage, and an outer cylindrical portion a part of which is uniformly formed with the inner cylindrical portion and which covers the inner cylindrical portion to form the exhaust air passage. There can be achieved for a light-weighted and slim-sized arrangement of the pipe through which the suction air passage and the exhaust air passage extends without the fear of dust plugging, and a vacuum cleaner of exhaust circumfluently flowing type can be easily put into to practice.

Abstract: A floating-point arithmetic processing apparatus has a circuit for generating a limit value for normalization shift by subtracting an exponent of the minimum value of a normalized number from a value of an exponent of an intermediate result, and a circuit for generating, as a normalization shift number, smaller one of a shift number necessary for making the mantissa of the intermediate result a normalized number and the limit value for normalization shift. The floating-point arithmetic processing apparatus further has a circuit having a circuit for detecting a condition for overflow before the rounding process and a circuit for generating a value in the case of overflow, so that a predetermined value is delivered as a final result only when the overflow condition is detected before the rounding process but in the other case, a result obtained by performing the normalization process and the rounding process is delivered.

Abstract: A multiplying apparatus includes a Booth decoder for performing a second-order Booth decode on a multiplier, a Booth selector for generating a partial product except the two high-order digits from the output of the decoder and a multiplicand, a partial product corrector for correcting the two high-order digits of the partial product based on the multiplier and the multiplicand and outputting the corrected result, for cancelling a sign corrected portion of the negative partial product, and a carry save adder for being inputted with the outputs of the Booth selector and the outputs of the corrector and adding them.

Abstract: To offer a floating-point addition/subtraction processing apparatus and a method thereof, capable of shortening the computation time, the floating-point calculation processing apparatus includes an approximate shift mount predicting unit for predicting a shift amount for normalization by using the input floating-point data to be addition/subtraction processed within an error of 1 bit, a shift error detecting unit for detecting a difference between the predicted shift amount and a correct shift amount, and an bit shifter for correcting a result, obtained by normalization using the predicted shift amount, by the detected difference of the two shift amounts, wherein a round-off determination and a shift amount calculation are processed in parallel before a normalization shift processing is executed.