Goodyear Patente

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An air maintenance tire assembly and a method of maintaining air within a tire is disclosed. The assembly comprises a tire having a tire cavity bounded by first and second sidewalls extending to a tire tread region, and having an elongate valve stem projecting outward from the tire cavity and operative to admit pressurized air into the cavity through a valve stem internal air passageway; the first sidewall having an elongate sidewall air passageway operatively located to compress segment by segment from an expanded diameter to a substantially reduced diameter responsive to a bending strain introduced into the first sidewall from a rolling tire footprint whereby forcing air segment by segment along the sidewall air passageway; and a connecting air passageway connected at opposite ends with the sidewall air passageway and with the valve stem internal air passageway, the connecting air passageway operative to direct air forced along the sidewall air passageway into the valve stem internal passageway as the tire rolls over a ground surface.

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A second stage tire building drum is disclosed. The drum (100) comprises a first and second hub (120, 120'), wherein each hub is mounted on a central shaft (110) of the second stage tire building drum (100); wherein at least one of said hubs (120, 120') is configured for unconstrained axial movement on the central shaft (110); and wherein each hub (120, 120') has a bead receiving mechanism mounted on each hub. Also, a method of forming a tire on a tire building drum (100) from a green tire carcass (600) is disclosed. The method comprises the steps of (i) applying a green tire carcass (600) onto the tire building drum (100) by placing a first and second bead onto a first and second respective bead receiving member of the tire building drum, wherein no bead locking force is utilized or (ii) applying a green tire carcass (600) onto the tire building drum (100) by placing a first and second bead onto a first and second respective bead pocket (212) of the tire building drum (100), wherein preferably a relatively low bead locking force is utilized and wherein at least one of the first and second respective bead pockets (212) are configured for unconstrained sliding in the axial direction. The method further comprises the step of inflating the carcass (600) into engagement with a belt and tread package (650) while at least one of the beads is free to move axially inward.

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A method for detecting the imbalanced state of a wheel (10) is disclosed. The method comprises the steps of: utilizing or measuring a tire acceleration signal and generating or extracting tire vertical mode frequency data; determining a wheel hop value from the peak of the curve of the tire vertical mode frequency data; and determining if the wheel hop value is greater than a predetermined threshold value, and then sending an alert if an imbalance is detected. Also, a wheel imbalance detection apparatus for determining if a wheel (10) is out of balance is disclosed. The apparatus comprises: tire vertical mode measuring means for measuring tire vertical mode frequency and generating tire vertical mode frequency data; tire identification means for generating a tire-specific threshold value using tire-specific identification data; and a comparator for comparing the vertical mode frequency data with a threshold value.

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A rubber composition for use in a pneumatic tire tread is disclosed. The rubber composition comprises, based on parts by weight per 100 parts by weight elastomer (phr): (A) 100 phr of diene-based elastomers comprising: (1) from 50 to 90 phr of a styrene/butadiene elastomer having a Tg in a range of from -35°C to -5°C or in a range of from -30°C to -10°C; (2) from 10 to 50 phr of cis 1,4-polybutadiene rubber having a Tg in a range of from -100°C to -109°C; (3) optionally zero up to 25 of at least one additional diene-based elastomer; (4) from 10 to 50 phr or from 20 to 40 phr of rubber processing oil comprising at least one of a petroleum based rubber processing oil and a vegetable triglyceride oil; (5) from 2 to 40 phr or from 4 to 20 phr of polyethylene glycol having an average molecular weight in a range of from 2000 to 6000; (B) from 40 to 250 phr or from 50 to 175 phr of a rubber reinforcing filler comprising silica and carbon black in a ration of silica to carbon black of at least 9/1; and (C) optionally 2 to 20 phr of a resin, preferably a traction promoting resin.

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A pneumatic tire having a radially outer tread (1500) is disclosed. The tread (1500) has one or more circumferential grooves (1510), wherein the bottom, or one or both sides, or the bottom and one or both sides of at least one circumferential groove (1510) are at least partially textured with flat-topped pyramids (1520).