Pneumatic tire for bicycle

Abstract

The invention relates to a two-wheeled vehicle pneumatic tire (1), preferably bicycle tire, particularly preferably racing bike tire (1), having a tread (2), a tire carcass, tire side walls (3) and two bead regions (4), each with a tire bead with a core (5), wherein the tire carcass comprises two carcass inlays (6,6) wherein the two carcass inlays (6, 6) extend from a zenith region (17) of the two-wheeled vehicle pneumatic tire (1) over the tire side walls (3) as far as the two bead regions (4) and are looped there around the respective core (5) from axially on the inside axially outward and end with carcass inlay ends (7,7) and wherein the two bead regions (4) each have a bead protective strip (8) arranged on the carcass from the outside as protection against chafing. The problem addressed is that of improving the rolling resistance. The problem is solved in that the carcass inlay ends (7) of the inner carcass inlay (6) are covered from the outside by the respective bead protective strip (8), wherein the inner carcass inlay (6) is formed by that carcass inlay of the two carcass inlays (6, 6) which is the radially inner carcass inlay in the zenith region (17). The invention furthermore relates to a two-wheeled vehicle having a tire of said type.

Claims

1. A tubeless or tubeless-ready pneumatic bicycle tire comprising: a tread positioned proximate a top portion of the tire; a tire carcass comprising an outer carcass inlay and an inner carcass inlay, the tire carcass positioned below the tread with the outer carcass inlay being outward of the inner carcass inlay in a zenith region under the tread, and the inner carcass inlay being in direct contact with an interior space of the tubeless or tubeless-ready tire; tire side wall regions on sides of the tire constructed with side portions of the tire carcass; two bead regions positioned below respective bases of the tire side wall regions, each of the bead regions with a tire bead and a core; the inner and outer carcass inlays each have individual reinforcement members running parallel to one another, the reinforcement members of each carcass inlay being arranged to enclose an angle of 40 degrees to 60 degrees with respect to the direction of rotation, and the reinforcement members of the inner and outer carcass inlays having an opposite pitch angle; the inner and outer carcass inlays each extend from the zenith region through the tire side wall regions to the two bead regions, are looped outwardly around the respective cores, and terminate at respective carcass inlay ends of the inner and outer carcass inlays; the carcass inlay ends of both the inner and outer carcass inlays terminate in the bead region, with the respective carcass inlay ends of the inner carcass inlay terminating at a height of at most 13 mm as measured relative to an outermost turning point of the reinforcement members of the inner carcass inlay that are looped around the respective cores; bead protective strips arranged on the carcass to cover the carcass inlay ends of both the inner and outer carcass inlays on both sides of the tire, each of the bead protective strips extending to cover a portion of the respective bead region, with each bead protective strip terminating at its radially outer end at a height of at most 15 mm as measured relative to the outermost turning point of the reinforcement members of the inner carcass inlay that are looped around the respective cores; the bead protective strips each being formed from a rubberized monofilament fabric that is free of intertwined fibers and microchannels; wherein the arrangement and structure of the bead protective strips promotes airtightness along with the inner and outer carcass inlays for tubeless or tubeless-ready operation; and wherein the carcass, in the respective tire sidewall regions between (i) the respective radially outer ends of the bead protective strips and (ii) the tread, has only two carcass inlay plies with reinforcement members, with one of the two carcass inlay plies being only one ply of the inner carcass inlay and the other of the two carcass inlay plies being only one ply of the outer carcass inlay.

2. The tire of claim 1, wherein the outer carcass inlay end terminates prior to the inner carcass inlay end, such that the outer carcass inlay end is covered by the inner carcass inlay.

3. The tire of claim 1, further comprising a damping rubber inlay positioned between the tread and the tire carcass proximate the top portion of the tire; wherein the damping rubber inlay comprises a highly elastic rubber having a rebound value of between 70 and 80, and wherein the damping rubber inlay (9) has a material thickness between 0.2 and 1 mm.

4. The tire of claim 1, wherein the radially outer end of each bead protective strip terminates the height of 10 mm to 12 mm, as measured relative to the outermost turning point of the reinforcement members of the inner carcass inlay that are looped around the respective cores.

5. The tire of claim 4, wherein the respective inner carcass inlay ends of the inner carcass inlay terminate at the height of 8 mm to 10 mm, as measured relative to the outermost turning point of the reinforcement members of the inner carcass inlay that are looped around the respective cores.

Description

(1) Further features, advantages and details of the invention will now be explained in more detail with reference to the schematic drawings, which represent exemplary embodiments. In the drawings:

(2) FIG. 1: shows a two-wheeled vehicle tire in cross section;

(3) FIG. 2: shows a detail of a two-wheeled vehicle tire in cross section.

(4) FIG. 1 shows the essential tire components of the two-wheeled vehicle tire 1 in a cross-sectional view. The tire is a two-wheeled vehicle pneumatic tire 1, preferably a bicycle tire, particularly preferably a racing bike tire 1, with a tread 2, a tire carcass, tire sidewalls 3 and two bead regions 4, each with a tire bead with a core 5.

(5) The tire carcass comprises two carcass inlays 6,6, wherein the two carcass inlays 6, 6 each have individual reinforcement members running parallel to one another, the reinforcement members being arranged at an angle of 40 degrees to 60 degrees with respect to the direction of rotation U and the reinforcement members of the two carcass inlays 6 having an opposite pitch angle, and wherein the two carcass inlays 6, 6 extend from a zenith region 17 of the two-wheeled vehicle pneumatic tire 1 over the tire sidewalls 3 as far as the two bead regions 4 and are looped there around the respective core 5 from axially on the inside axially outward and end with carcass inlay ends 7,7 having reinforcement member ends of the carcass inlay 6,6.

(6) Furthermore, the two bead regions 4 each have a bead protective strip 8 arranged on the carcass from the outside as protection against chafing.

(7) The two-wheeled vehicle tire is distinguished in that at least the carcass inlay ends 7 of the inner carcass inlay 6 are covered from the outside by the respective bead protective strip 8, wherein the inner carcass inlay 6 is formed by that carcass inlay of the two carcass inlays 6, 6 which is the radially inner carcass inlay in the zenith region 17. The outer carcass inlay 6 is formed here by that carcass inlay of the two carcass inlays 6, 6 which is the radially outer carcass inlay in the zenith region.

(8) The carcass inlay ends 7 and thus the reinforcement member ends of the inner carcass inlay 6 are thus arranged between the bead protective strip 8 and the outer carcass inlay 6, wherein a rubber coating of the inner carcass inlay 6 can be arranged between the reinforcement member ends of the carcass inlay end 7 and the bead protective strip 8. A straight line 18 oriented perpendicular to the bead protective strip 8 can connect the bead protective strip 8 and the carcass inlay end 7.

(9) In the case of rubberized plies having reinforcement members, in particular the carcass inlays 6, 6 and/or the bead protective strip 8, the lines shown schematically represent the extent of the reinforcement members.

(10) The bead protective strip 8 can end at a radially outer end 12 at a first height 13 of at most 15 mm, preferably of 10 mm to 12 mm, as measured relative to an outermost turning point 14 of an outer edge of the reinforcement members of the inner carcass inlay 6 that are looped around the core 5. Alternatively or additionally, the carcass inlay ends 7 of the inner carcass inlay 6 can be arranged at a second height 15 of at most 13 mm, preferably of 8 mm to 10 mm, as measured relative to an outermost turning point 14 of the reinforcement members of the inner carcass inlay 6 that are looped around the core 5.

(11) A dimensioning of the first height 13 and the second height 15 is illustrated in FIG. 2.

(12) The bead protective strip 8 is designed as a rubberized band having fibers, in particular as a rubberized fabric band. The fibers, in particular the fabric edge of the fabric, predetermine the radially outer end 12 of the bead protective strip 8.

(13) The carcass inlay ends 7 of the inner carcass inlay 6 can end in the bead region 4, in particular coming from the core 5 in front of the sidewall 3.

(14) In particular for tubeless operation, the bead protective strip 8 is free of threads which have intertwined fibers and connect a radially outer end 12 of the bead protective strip 8 and an inner end 16 of the bead protective strip 8. For this purpose, the bead protective strip 8 can be designed as a rubberized monofilament fabric.

(15) The carcass can be in direct contact with the tire interior 10.

(16) At least in one region of the sidewall 3, in particular adjoining the bead strip 8 radially from the outside, the two carcass inlays 6, 6 can be the only inlays having reinforcement members.

(17) The carcass inlay ends 7 of the outer carcass inlay 6 of the two carcass inlays 6,6 can be covered from the outside by the inner carcass inlay 6 or by the bead protective strip 8. The outer carcass inlay 6 here is the radially outer of the two carcass inlays 6, 6 in the zenith region.

(18) A damping rubber inlay (9) composed of a highly elastic rubber can be arranged between the tread (2) and the tire carcass, the damping rubber inlay 9 having in particular a material thickness between 0.2 mm and 1 mm. The damping rubber inlay can preferably be composed of a highly elastic rubber having a material rebound value between 70 and 80.

(19) A protective ply (not shown) comprising a particularly tear-resistant fabric, preferably a fabric comprising fibers made of polyethylene terephthalate-polyacrylate, can be arranged between the tread 2 and the tire carcass.

(20) The reinforcement members of the carcass inlays are preferably arranged at an angle to the direction of rotation U of 42 degrees to 48 degrees, particularly preferably 43 degrees to 48 degrees.

(21) The tire can in particular be a tubeless tire or a tubeless ready tire. The tire can be suitable, intended and used for tubeless operation. The tire for tubeless operation or the tubeless tire can in particular be part of a bicycle, with the tire interior 10 enclosed by a rim and the tire 1 being without a tube.

(22) The tire can be a bicycle tire 1, in particular a racing bike tire 1, a mountain bike tire or a tire for a bicycle having an electric motor for driving the bicycle. The tire can be suitable, intended and used for a corresponding bicycle. In particular, a bicycle, in particular a racing bike, a mountain bike or a bicycle having an electric motor for driving the bicycle, can have such a tire 1.

(23) The tire 1 shown is preferably a racing bike tire.

(24) A tire for operation with a tube, in particular a clincher tire, can also have a corresponding advantageous construction. Motorcycle tires, in particular electric scooter tires, can also have the advantageous construction shown.

(25) FIG. 2 illustrates the dimensioning of the first height 13 and the second height 15.

(26) To determine the first height 13 and the second height 15, the two-wheeled vehicle pneumatic tire 1 can be bent up in its cross section in such a way that the two carcass inlays 6, 6 coming from the zenith region 17 are arranged substantially rectilinearly in the region of the sidewall 3 and merge into a looping around the core 5 that is substantially symmetrical with respect to the core 5. This can be a detail of the tire of FIG. 1, with the two-wheeled vehicle pneumatic tire 1 being correspondingly bent up in its cross section.

(27) In this arrangement, the first height 13 of the radially outer end 12 of the bead protective strip 8 is measured relative to the outermost turning point 14 of an outer edge of the reinforcement members of the inner carcass inlay 6 that are looped around the core 5 and measured parallel to the carcass inlays 6, 6 that are arranged substantially rectilinearly.

(28) In this arrangement, the second height 15 of the carcass inlay ends 7 is measured relative to the outermost turning point 14 of an outer edge of the reinforcement members of the inner carcass inlay 6 that are looped around the core and measured parallel to the carcass inlays 6, 6 arranged substantially rectilinearly.

LIST OF REFERENCE DESIGNATIONS

Part of the Description

(29) 1 Two-wheeled vehicle pneumatic tire 2 Tread 3 Sidewall 4 Bead region 5 Core 6 Outer carcass inlay 6 Inner carcass inlay 7 Carcass inlay end of the outer carcass inlay 7 Carcass inlay end of the inner carcass inlay 8 Bead protective strip 9 Rubber inlay 10 Tire interior 11 Tire exterior 12 Radially outer end of the bead protective strip 13 First height 14 Outermost turning point 15 Second height 16 Inner end 17 Zenith region 18 Straight line rR Radial direction aR Axial direction U Direction of rotation