The invention relates to a bicycle tire. Conventional bicycle tires, in particular racing bicycle tires, are specified and optimized in terms of rolling resistance, puncture protection, and service life.
It is known for bicycle tires to be provided with a cut-resistant fibrous inlay in order for the tire to be protected against puncturing. The relatively rigid material of the cut-resistant fibrous inlay may have a negative influence on the rolling resistance of the bicycle tire.
The invention is based on the object of improving a bicycle tire. In particular, the rolling resistance in the case of racing bicycle tires is to be reduced.
The object is achieved, as per the preamble and the characterizing features of claim 1, in that
a cut-resistant fibrous layer having a multiplicity of strength members, running in parallel, from a polymer are disposed between the running strip and the tire carcass, wherein the strength members are disposed at an angle between approx. 80 and 110 degrees in relation to the circumferential direction of the bicycle tire.
One advantage of the tire according to the invention is to be seen in that the rolling resistance is significantly improved by way of the new tire construction of the bicycle tire, wherein the puncture protection is not simultaneously compromised by the cut-resistant fibrous inlay. In particular, the rolling resistance of the bicycle tire is substantially reduced by the particular arrangement of the strength members at an angle between 80 and 110 degrees in relation to the circumferential direction of the bicycle tire. This surprising effect of the novel arrangement of the strength members has been demonstrated in particular in experiments.
In one advantageous refinement of the invention it is provided that the strength members of the cut-resistant fibrous layer in relation to the circumferential direction of the bicycle tire are disposed substantially at an angle from 85 to 110 degrees, preferably approx. 90 degrees. An optimum value for rolling resistance is achieved in the case of this arrangement of the strength members in the cut-resistant layer.
In one further advantageous refinement of the invention it is provided that the cut-resistant layer in the plan view is approx. 2 to 5 mm narrower than the running strip. On account thereof, the cut-resistant fibrous layer is only disposed in that region of the tire carcass in which cuts are to be normally expected.
In one further advantageous refinement of the invention it is provided that the strength members of the cut-resistant fibrous layer are composed of a liquid-spun polymer, in particular from polyester polyacrylate. This type of strength member is distinguished by a particularly high resistance to cutting.
In one further advantageous refinement of the invention it is provided that the diameter of the strength members is approx. 0.1 to 0.3 mm. On account thereof, the cut-resistant fibrous layer has a relatively low weight.
In one further advantageous refinement of the invention it is provided that the cut-resistant fibrous layer on the lower and the upper side comprises a rubber coating, and has a material thickness of approx. 0.3 to 0.5 mm, preferably of 0.35 mm. On account thereof, the bicycle tire has high puncture protection, wherein the total weight is simultaneously kept low.
In one further advantageous refinement of the invention it is provided that the strength members in the cut-resistant fibrous layer are disposed at a high material density, wherein the spacing of the strength members running in parallel is approx. 50 to 250 strength members per inch. On account thereof, the cut-resistant fibrous layer guarantees high puncture protection.
In one further advantageous refinement of the invention it is provided that a damping rubber inlay from a highly elastic rubber is disposed above the tire carcass, wherein the damping rubber inlay rebound 70 to 80 has a material thickness between 0.2 and 2 mm,
wherein the carcass inlay ends at maximum reach up to the lateral peripheral regions of the running strip.
A damping rubber inlay from a highly elastic rubber in the case of this tire construction is disposed between the running strip and the tire carcass. The ride comfort of the bicycle tire is substantially improved due to the special material thickness of the damping rubber inlay, since the bicycle tire overall is better able to adapt to the ground of the carriageway. Moreover, the carcass inlay ends at maximum reach up to the lateral peripheral regions of the running strip. In this way, the tire carcass below the running strip has high elasticity, on account of which the ride comfort is likewise substantially improved. The new tire construction leads to a substantial improvement of the ride comfort in particular in the case of racing bicycle tires.
In one further advantageous refinement of the invention it is provided that the tire carcass has two carcass inlays, lying on top of one another, wherein the side walls are reinforced and the rolling resistance is reduced by way of the carcass construction. The two carcass inlays, lying on top of one another, lead to a simplification in the manufacturing process of bicycle tires. Moreover, the rolling resistance of the bicycle tire may be reduced by way of this side-wall construction.
In one further advantageous refinement of the invention it is provided that the two carcass inlays, lying on top of one another, cover the entire side wall, and the carcass inlay ends terminate shortly below of the lateral peripheral regions of the running strip. Optimal protection for the side wall is guaranteed in this way.
In one further advantageous refinement of the invention it is provided that the damping rubber inlay has a material thickness between 0.3 and 1 mm. Optimum ride comfort is achieved at this material thickness, wherein the rolling resistance of the bicycle tire is not simultaneously increased.
In one further advantageous refinement of the invention it is provided that the damping rubber inlay is composed of a highly elastic rubber having a material rebound value between 70 and 80.
Optimum ride comfort is achieved at this material rebound value, wherein the rolling resistance of the bicycle tire is not simultaneously increased.
In one further advantageous refinement of the invention it is provided that the bicycle tire is a racing bicycle tire and is operated at a minimum tire pressure of approx. 5.5 bar. The new tire construction may be particularly advantageously employed in racing bicycle tires, since the ride comfort is substantially increased.
The invention is to be explained in greater detail using one exemplary embodiment. The drawings show:
Number | Date | Country | Kind |
---|---|---|---|
10 2014 214 893.6 | Jul 2014 | DE | national |
Filing Document | Filing Date | Country | Kind |
---|---|---|---|
PCT/EP2015/061617 | 5/27/2015 | WO | 00 |