Amphibious tires with improved torque resistance properties |
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| 申请号 | US3736971D | 申请日 | 1971-04-14 | 公开(公告)号 | US3736971A | 公开(公告)日 | 1973-06-05 |
| 申请人 | UNIROYAL INC; | 发明人 | PAUL R; WILSON J; | ||||
| 摘要 | An amphibious tire construction for use with ''''all-terrain'''' vehicles and having improved resistance to failure, particularly in the hub area under severe acceleration and braking stresses are disclosed. In such a tire, the axial openings in the sidewalls are disposed concentrically with a rigid, tubular hub, and the side-walls are vulcanized or bonded at their radially inwardmost edge regions bounding said openings, directly to the respective opposite ends of the hub. The sidewalls are reinforced by respective centrally apertured disc-shaped patches incorporated in the sidewalls concentrically with the hub. Each such patch consists of a laminate of a plurality of strips of calender coated fabric stock superimposed on each other in a crossing, asterisk-like fashion so that the patch is thickest in the region thereof which is immediately adjacent its central opening and decreases in thickness gradually through the surrounding regions located radially outwardly of the central region. A tire so reinforced has a greater rigidity at the critical area thereof, which is in the vicinity of the hub, than at other sidewall areas, with this rigidity decreasing in the direction radially outwardly from the hub so that overall sidewall flexibility is effectively not impaired. | ||||||
| 权利要求 | 1. An amphibious tire for an all-terrain vehicle, comprising: A. a toroidally shaped tire body including 1. a circumferential tread, and 2. a pair of annular sidewalls, said sidewalls a. extending from the opposite side regions of said tread generally radially inwardly thereof and b. terminating in respective radially inwardmost edges defining a pair of coaxial central openings; B. an elongate rigid hub extending axially through said tire body and into both said central openings thereof; C. said tire body being vulcanized at the radially inwardmost edge regions of said sidewalls to said hub peripherally of the latter; and D. a pair of centrally apertured, planar, disc-shaped, reinforcing patches of calender coated fabric stock vulcanized to said sidewalls, respectively, with the boundaries of the central apertures of said patches generally coinciding with the periphery of said hub, 1. each of said patches being composed of a laminate of a plurality of multilateral strips of said fabric stock and having said central aperture thereof located in the region of superimposition of all said strips, and 2. each of said strips in each of said patches being angularly displaced in its plane about the axis of the respective central aperture relative to each next adjacent strip of the same patch to impart to that patch along any radial line thereof a plurality of radially contiguous zones of different thicknesses, with a. the zone of maximum thickness bounding the respective central aperture of that patch, and b. each successive zone as viewed in the radially outward direction from said central aperture having a lesser thickness than the immediately preceding zone; E. each of said sidewalls thereby having, in corresponding regions thereof surrounding said hub, an enhanced rigidity which decreases gradually in the radially outward direction of said tire body from a maximum value adjacent said hub; F. whereby the tire has improved torque resistance in the hub regions of said sidewalls without impairment of the overall flexibility and resiliency of the tire. 2. a pair of annular sidewalls, said sidewalls a. extending from the opposite side regions of said tread generally radially inwardly thereof and b. terminating in respective radially inwardmost edges defining a pair of coaxial central openings; B. an elongate rigid hub extending axially through said tire body and into both said central openings thereof; C. said tire body being vulcanized at the radially inwardmost edge regions of said sidewalls to said hub peripherally of the latter; and D. a pair of centrally apertured, planar, disc-shaped, reinforcing patches of calender coated fabric stock vulcanized to said sidewalls, respectively, with the boundaries of the central apertures of said patches generally coinciding with the periphery of said hub, 2. each of said strips in each of said patches being angularly displaced in its plane about the axis of the respective central aperture relative to each next adjacent strip of the same patch to impart to that patch along any radial line thereof a plurality of radially contiguous zones of different thicknesses, with a. the zone of maximum thickness bounding the respective central aperture of that patch, and b. each successive zone as viewed in the radially outward direction from said central aperture having a lesser thickness than the immediately preceding zone; E. each of said sidewalls thereby having, in corresponding regions thereof surrounding said hub, an enhanced rigidity which decreases gradually in the radially outward direction of said tire body from a maximum value adjacent said hub; F. whereby the tire has improved torque resistance in the hub regions of said sidewalls without impairment of the overall flexibility and resiliency of the tire. 2. An amphibious tire as claimed in claim 1, wherein each of said patches is a laminate of three generally rectangular strips of said fabric stock of substantially equal lengths, said strips being arranged in crossing, asterisk-like fashion relative to each other with their end edges forming the sides of a hexagon when viewed in plan. 3. An amphibious tire as claimed in claim 2, wherein each of said patches further includes a second three-strip laminate identical to and laminated with said first-named laminate. 4. An amphibious tire as claimed in claim 3, wherein said second laminate is angularly displaced in its plane about the axis of the respective central aperture relative to said first-named laminate to dispose the two contacting middle strips of the respective patch in angularly crossing relation to each other. 5. An amphibious tire as claimed in claim 1, wherein each of said patches includes four generally rectangular strips of said fabric stock of substantially equal lengths, said strips being arranged in crossing, asterisk-like fashion relative to each other with their end edges forming the sides of an octagon when viewed in plan. 6. An amphibious tire as claimed in claim 5, wherein each of said patches further includes a second four-strip laminate identical to and laminated with said first-named laminate. 7. An amphibious tire as claimed in claim 6, wherein said second laminate is angularly displaced in its plane about the axis of the respective central aperture relative to said first-named laminate to dispose the two contacting middle strips of the respective patch in angularly crossing relation to each other. 8. An amphibious tire as claimed in claim 1, wherein an annular groove facing outwardly of the tire is provided in each of said sidewalls concentrically with said hub and adjacent the juncture thereof with the respective sidewall, each of said patches having its zone of maximum thickness located in the region of the associated groove and following the contours of the latter. 9. A sidewall-reinforcing patch for an amphibious tire having a hub to which the radially inwardmost regions of the tire sidewalls are vulcanized, comprising a planar laminate of a plurality of multilateral strips of calender coated fabric stock, said laminate in the region of superimposition of all said strips having a central aperture of a size sufficient to accommodate the hub of the tire, and each of said strips being angularly displaced in its plane about the axis of said central aperture relative to each next adjacent strip to impart to the patch along any radial line thereof a plurality of radially contiguous zones of different thicknesses, with the zone of maximum thickness bounding said central aperture, and with each successive zone as viewed in the radially outward direction from said central aperture having a lesser thickness than the immediately preceding zone. 10. A sidewall-reinforcing patch as claimed in claim 9, wherein there are provided three generally rectangular strips of said fabric stock of substantially equal lengths, said strips being arranged in crossing, asterisk-like fashion relative to each other with their end edges forming the sides of a hexagon when viewed in plan. 11. A sidewall-reinforcing patch as claimed in claim 10, further comprising a second three-strip laminate identical to and laminated with said first-named laminate. 12. A sidewall-reinforcing patch as claimed in claim 11, wherein said second laminate is angularly displaced in its plane about the axis of said central aperture relative to said first-named laminate to dispose the two contacting middle strips of the patch in angularly crossing relation to each other. 13. A sidewall-reinforcing patch as claimed in claim 9, wherein there are provided four generally rectangular strips of said fabric stock of substantially equal lengths, said strips being arranged in crossing, asterisk-like fashion relative to each other with their end edges forming the sides of an octagon when viewed in plan. 14. A sidewall-reinforcing patch as claimed in claim 13, further comprising a second four-strip laminate identical to and laminated with said first-named laminate. 15. A sidewall-reinforcing patch as claimed in claim 14, wherein said second laminate is angularly displaced in its plane about the axis of said central aperture relative to said first-named laminate to dispose the two contacting middle strips of the patch in angularly crossing relation to each other. |
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