摘要:
Fluid distribution plate (1) for a fuel cell assembly, comprising a first plate (11) made of an electrically conductive material impermeable to all the fluids used in a fuel cell assembly, said distribution plate having a useful section (S) which is the surface over which the gases used by the electrochemical reaction are distributed, said useful section (S) being bordered all around by a peripheral section (P), said first plate having a given thickness e1 in the peripheral section and a smaller thickness e2 in the useful section so as to form a recess from the side facing the outer face and so as to have a flat inner surface, a flexible graphite foil (11C) being applied against said first plate (11) over the entire surface of the recess, the visible face of the flexible graphite foil having a distribution channel (111) for one of the fluids, said network being formed completely in the graphite foil.
摘要:
A pneumatic tire provided with a noise damper in the tire cavity, which can maintain high-speed durability and productivity while also reducing cavity resonance, comprising a tread having a width TW in contact with the ground during travel, in which a noise damper made of a sound-absorbing material is attached to the tire internal surface in order to reduce cavity resonance, wherein the noise damper is at least one continuous ribbon made of a sound-absorbing material and having a width W and a thickness E, which is fixed over an attachment width Wc to the tire internal surface over a range of at least 30% of the inside of the tread in the radial direction, the start end and terminal end which are the two ends of the continuous ribbon are disposed in such a way as to be offset from each other in the axial direction, and the continuous ribbon forms, together with the tire internal surface, a continuous groove having a groove width D which is at least equal to 10% of the width W of the continuous ribbon.
摘要:
A method for producing a pneumatic tire in which a noise damper in the form of at least one continuous ribbon for reducing cavity resonance in a tire cavity is provided on the internal surface of a tire on the inside in the radial direction of the tire corresponding to the tire tread, including, providing a vulcanized and shaped tire; mixing a composition for forming the noise damper with a foaming agent to produce a liquid composition; rotating the tire in an upright state by means of a tire holding and rotation device, and introducing the liquid composition onto the tire internal surface by a device for introducing the liquid composition; varying the relative positional relationship of the pneumatic tire and the introduction implement in the axial direction of the tire while introducing the liquid composition is introduced onto the tire internal surface, and forming the liquid composition into a gel; and foaming and drying the gelled liquid composition.
摘要:
Adhesive composition usable in particular as an adhesion primer, based on a polyisocyanate compound and a polyester or vinyl ester resin comprising (in particular hydroxyl) functional groups which are reactive towards isocyanate groups of said polyisocyanate, the total number of said isocyanate groups being in excess relative to the total number of said functional groups of the polyester or vinyl ester resin. The polyisocyanate compound is preferably a diisocyanate, the resin is preferably an epoxy vinyl ester resin, in particular novolac- and/or bisphenol-based. Said composition is usable, as an adhesion primer, in combination with a secondary adhesion layer preferably based on a polyvinylpyridine/stirene/butadiene elastomer and a polyester or vinyl ester resin. Use of such an adhesive system for bonding a cured polyurethane to an uncured diene elastomer composition, in particular in the manufacture of rubber articles consisting of ground contact systems for motor vehicles, in particular pneumatic or non-pneumatic tires.
摘要:
A tire having a reinforcement structure with improved resistance to a hinge effect is provided. More particularly, a tire is provided with a reinforcement structure that is positioned in the crown portion of the tire. The reinforcement structure has a circumferential extension modulus of about 5 GPa or greater and an axial plane shear modulus of about 10 MPa or greater. Exemplary embodiments of a tire with the reinforcement structure are provided.
摘要:
Adhesive composition usable in particular as an adhesion primer, based on a polyisocyanate compound and a polyester or vinyl ester resin comprising (in particular hydroxyl) functional groups which are reactive towards isocyanate groups of said polyisocyanate, the total number of said isocyanate groups being in excess relative to the total number of said functional groups of the polyester or vinyl ester resin. The polyisocyanate compound is preferably a diisocyanate, the resin is preferably an epoxy vinyl ester resin, in particular novolac- and/or bisphenol-based. Said composition is usable, as an adhesion primer, in combination with a secondary adhesion layer preferably based on a polyvinylpyridine/stirene/butadiene elastomer and a polyester or vinyl ester resin. Use of such an adhesive system for bonding a cured polyurethane to an uncured diene elastomer composition, in particular in the manufacture of rubber articles consisting of ground contact systems for motor vehicles, in particular pneumatic or non-pneumatic tires.
摘要:
Composite laminated product (1) that forms a deformable cellular structure, comprising: an upper band (2) and a lower band (3) both oriented in the same main direction (X); and between the two bands (2, 3) and connecting the latter, a series that extends in the direction X, of cylinders (4) referred to as connection cylinders, said connection cylinders (4) being non-touching in the direction X and having their generatrix oriented along an axis Y perpendicular to the direction X. The connection cylinders are composite cylinders comprising fibres embedded in a resin matrix. Such a laminated product can be used as an elastic beam having a high resistance to flexural/compressive stresses and having a high endurance to such repeated or alternated stresses, in particular as a shear band in a non-pneumatic resilient wheel.
摘要:
A sulfur-crosslinkable adhesive composition of the non-aqueous type, that is to say not requiring the presence of water, usable for direct bonding of a pregelled polyester or vinyl ester composite to rubber in the uncured state. The composition comprises polyvinylpyridine-styrene-butadiene elastomer (“p-VSBR”) in combination with a polyester or vinyl ester resin. Preferably, the resin used is a novolak and/or bisphenol based resin of the epoxy vinyl ester type. This composition, unlike conventional RFL adhesives, does not require any activation treatment, such as intermediate drying, at the time of use. A process for preparing such an adhesive composition, use of said composition for the manufacture of laminated composite parts.
摘要:
A vehicle (1) equipped with a tank (2) for storage of a fluid under pressure on the vehicle, the tank being connected to at least one vent channel (3 and 33), the vent channel leading to a discharge orifice (34), the vent channel being connected to the tank by means of at least one safety valve, wherein in that the safety valve is a thermal release valve (5), normally closed and capable of opening spontaneously under the effect of a rise in temperature, the safety valve being installed in a predefined zone of the vehicle and the discharge orifice being remote from the predefined zone.
摘要:
A non-pneumatic wheel having an annular reinforcement structure that includes rectangular reinforcements within a shear layer. The rectangular reinforcements replace deforming rubber or polymeric materials and can thereby reduce the volume of deforming materials to optimize energy loss therein and reduce rolling resistance of the non-pneumatic wheel.