PNEUMATIC VEHICLE TIRE HAVING A RIM PROTECTION RIB

Abstract

A pneumatic vehicle tire having a rim protection rib (9), wherein the design of the rim protection rib has the object of having a pneumatic vehicle tire with improved durability, and scaling of the axial width of the rim protection rib is intended to permit only minor effects on the rolling resistance and the durability; this is achieved in that, as viewed in the tire cross section, an axially outer contour (10) of the rim protection rib (9) begins radially on the outside with a convexly curved first region (12) which tangentially adjoins an axially outer contour (11) of the sidewall (6), in that the first region (12) merges radially inward tangentially into a concavely curved second region (13), in that the second region (13) merges tangentially into a convexly curved third region (15), and in that the third region (15) merges tangentially into a fourth region (16) encompassing the axially outermost point (17) of the rim protection rib (9).

Claims

1-9. (canceled)

10. A pneumatic vehicle tire having a tread (1), two sidewalls (6) and two bead regions (5), wherein axially on an outside (A) at least on one tire sidewall of the two tire sidewalls (6) at a level of one bead region of the two bead regions (5) there is a rim protection rib (9) running around a circumference of the one tire sidewall, wherein, as viewed in a tire cross section, an axially outer contour (10, 10′) of the rim protection rib (9) has a concave curvature; wherein as viewed in the tire cross section, the axially outer contour (10, 10′) of the rim protection rib (9): begins radially on the outside with a convexly curved first region (12) which tangentially adjoins an axially outer contour (11) of the one tire sidewall (6) and differs in its curvature from a curvature of the one tire sidewall (6) adjoining the rim protection rib (9) radially on the outside, in that the first region (12) merges radially inward tangentially into a concavely curved second region (13), in that the second region (13) merges tangentially into a convexly curved third region (15), and in that the third region (15) merges tangentially into a fourth region (16) encompassing an axially outermost point (17) of the rim protection rib (9).

11. The pneumatic vehicle tire as claimed in claim 10, wherein, as viewed in the tire cross section radially inward from radially on the outside, a thickness (29) of the one sidewall (6) is substantially constant over a height extent (30) of at least ⅓ of the height (28) of the sidewall radially outside a tire equator (14) and is from 2 mm to 5 mm.

12. The pneumatic vehicle tire as claimed in claim 11, wherein the thickness (29) of the one sidewall is 3 mm.

13. The pneumatic vehicle tire as claimed in claim 10, wherein height (20) of the rim protection rib (9) is from 14 mm to 21 mm, wherein the height (20) is measured radially outward from the axially outermost point (17) of the rim protection rib, and wherein the rim protection rib (9) has a height extent (21) of from 0 mm to a maximum of 8 mm radially outside the tire equator (14).

14. The pneumatic vehicle tire as claimed in claim 10, wherein the first region (12) adjoins the second region (13) at a first turning point (22), the first turning point (22) being arranged at a radial distance (23) from the axially outermost point (17) of the rim protection rib of from 10 mm to 17 mm, and in that the second region (13) adjoins the third region (15) at a second turning point (24), the second turning point (24) being arranged at a radial distance (25) from the axially outermost point (17) of the rim protection rib of from 4 mm to 6 mm.

15. The pneumatic vehicle tire as claimed in claim 10, wherein the first region (12) is designed as a circular arc with a first radius (R1) of from 40 mm to 200 mm.

16. The pneumatic vehicle tire as claimed in claim 10, wherein the second region (13) is designed as a circular arc with a second radius (R2) of from 30 mm to 40 mm.

17. The pneumatic vehicle tire as claimed in claim 10, wherein the third region (15) is designed as a circular arc with a third radius (R3) of from 8 mm to 12 mm.

18. The pneumatic vehicle tire as claimed in claim 10, wherein the fourth region (16) is delimited radially inward from the axially outermost point (17) and has a height (26) of from 1.8 mm to 3 mm.

19. The pneumatic vehicle tire as claimed in claim 10, wherein the pneumatic vehicle tire is a radial tire for a passenger car with a height-to-width ratio of from 25% to 65%.

20. A pneumatic vehicle tire having a tread (1), two sidewalls (6) and two bead regions (5), wherein axially on an outside (A) at least on one tire sidewall of the two tire sidewalls (6) above one bead region of the two bead regions (5) there is a rim protection rib (9) running around a circumference of the one tire sidewall, wherein, as viewed in a tire cross section, an axially outer contour (10, 10′) of the rim protection rib (9) has a concave curvature; wherein as viewed in the tire cross section, the axially outer contour (10, 10′) of the rim protection rib (9): begins radially on the outside with a convexly curved first region (12) which tangentially adjoins an axially outer contour (11) of the one tire sidewall (6) and differs in its curvature from a curvature of the one tire sidewall (6) adjoining the rim protection rib (9) radially on the outside, in that the first region (12) merges radially inward tangentially into a concavely curved second region (13), in that the second region (13) merges tangentially into a convexly curved third region (15), and in that the third region (15) merges tangentially into a fourth region (16) encompassing an axially outermost point (17) of the rim protection rib (9).

21. The pneumatic vehicle tire as claimed in claim 20, wherein, as viewed in the tire cross section radially inward from radially on the outside, a thickness (29) of the one sidewall (6) is substantially constant over a height extent (30) of at least ⅓ of the height (28) of the sidewall radially outside a tire equator (14) and is from 2 mm to 5 mm.

22. The pneumatic vehicle tire as claimed in claim 21, wherein the thickness (29) of the one sidewall is 3 mm.

23. The pneumatic vehicle tire as claimed in claim 20, wherein height (20) of the rim protection rib (9) is from 14 mm to 21 mm, wherein the height (20) is measured radially outward from the axially outermost point (17) of the rim protection rib, and wherein the rim protection rib (9) has a height extent (21) of from 0 mm to a maximum of 8 mm radially outside the tire equator (14).

24. The pneumatic vehicle tire as claimed in claim 20, wherein the first region (12) adjoins the second region (13) at a first turning point (22), the first turning point (22) being arranged at a radial distance (23) from the axially outermost point (17) of the rim protection rib of from 10 mm to 17 mm, and in that the second region (13) adjoins the third region (15) at a second turning point (24), the second turning point (24) being arranged at a radial distance (25) from the axially outermost point (17) of the rim protection rib of from 4 mm to 6 mm.

25. The pneumatic vehicle tire as claimed in claim 20, wherein the first region (12) is designed as a circular arc with a first radius (R1) of from 40 mm to 200 mm.

26. The pneumatic vehicle tire as claimed in claim 20, wherein the second region (13) is designed as a circular arc with a second radius (R2) of from 30 mm to 40 mm.

27. The pneumatic vehicle tire as claimed in claim 20, wherein the third region (15) is designed as a circular arc with a third radius (R3) of from 8 mm to 12 mm.

28. The pneumatic vehicle tire as claimed in claim 20, wherein the fourth region (16) is delimited radially inward from the axially outermost point (17) and has a height (26) of from 1.8 mm to 3 mm.

29. The pneumatic vehicle tire as claimed in claim 20, wherein the pneumatic vehicle tire is a radial tire for a passenger car with a height-to-width ratio of from 25% to 65%.

Description

[0034] Further features, advantages and details of the invention will be discussed in more detail on the basis of the drawings, which illustrate schematic exemplary embodiments. In the drawings

[0035] FIG. 1 shows a partial cross section of the pneumatic vehicle tire according to the invention;

[0036] FIGS. 2 and 3 each show an enlargement of a partial cross section of a pneumatic vehicle tire according to the invention.

[0037] FIG. 1 shows a partial cross section through a radial tire for passenger cars, which has a profiled tread 1, a belt 2 consisting of two plies 2a, 2b, which is covered by a bandage 18, a radial carcass 3, an airtight inner layer 4, sidewalls 6 and bead regions 5 with bead cores 7 and core profiles 8. A rim protection rib 9 running around the circumference of the tire sidewall 6 is arranged axially on the outside A at least on one tire sidewall 6 above the bead region 5. The rim protection rib 9 is completely or partially part of the sidewall 6.

[0038] As viewed in the tire cross section, an axially outer contour 10 of the rim protection rib 9 begins radially on the outside with a convexly curved first region 12 which tangentially adjoins an axially outer contour 11 of the sidewall 6 and differs in its curvature from a curvature of the sidewall 6 adjoining the rim protection rib 9 radially on the outside.

[0039] The first region 12 merges radially inward tangentially into a concavely curved second region 13. The second region 13 merges tangentially into a convexly curved third region 15. The third region 15 merges tangentially into a fourth region 16 encompassing the axially outermost point 17 of the rim protection rib 9.

[0040] The four regions 12, 13, 15, 16 in each case merge into one another tangentially, as a result of which an axially outer contour of the rim protection rib free of kinks is made possible. The cross-sectional height Qh of the pneumatic vehicle tire is measured from the outer tread surface to the cross-sectional height of the nominal rim diameter at which the nominal rim width 19 is measured.

[0041] The tire equator 14 runs perpendicular to the radial direction rR at half the cross-sectional height ½ Qh of the tire. The rim protection rib 9 is completely or at least partially part of the sidewall 6. The designation of the curvature as concavely or convexly curved refers to a viewing direction of the tire surface from axially on the outside.

[0042] A radial tire for a passenger car, preferably with a height-to-width ratio of 25% to 65%, can be involved.

[0043] The thickness 29 of the sidewall 6 can be substantially constant over a height extent 30 of at least ⅓ of the height 28 of the sidewall radially outside the tire equator 14 and can be 2 mm to 5 mm, in particular approximately 3 mm, here. The height 28 of the sidewall radially outside the equator 14 is measured here from the tire equator 14 as far as the radially innermost end of a breaker belt assembly made of belt plies 2a, 2b and a bandage 18. The thickness 29 of the sidewall is measured axially outside the carcass 3 perpendicular to the carcass 3.

[0044] FIG. 2 illustrates an enlargement of a partial cross section of an exemplary embodiment of a pneumatic vehicle tire according to the invention at least in the region of the rim protection rib 9. For the sake of clarity, only the contour of the tire is illustrated. It can be the pneumatic vehicle tire illustrated in FIG. 1.

[0045] The height 20 of the rim protection rib 9 is 14 mm to 21 mm, preferably 17 mm to 21 mm, particularly preferably 19 mm to 21 mm, the height 20 being measured radially outward from the axially outermost point 17 of the rim protection rib. At the same time, the rim protection rib 9 radially outside of the tire equator 14 has a height extent 21 of 0 mm to a maximum of 8 mm.

[0046] The first region 12 adjoins the second region 13 at a first turning point 22, the first turning point 22 being arranged at a radial distance 23 from the axially outermost point 17 of the rim protection rib of 10 mm to 17 mm. At the same time, the second region 13 adjoins the third region 15 at a second turning point 24, the second turning point 24 being arranged at a radial distance 25 from the axially outermost point 17 of the rim protection rib of 4 mm to 6 mm.

[0047] The first region 12 is designed as a circular arc, preferably as a circular arc with a radius R1 of 40 mm to 200 mm. The segment of a circle belonging to the circular arc is illustrated by dashed lines. The second region 13 is designed as a circular arc with a radius R2 of 30 mm to 40 mm, preferably of 34 mm to 36 mm. The third region 15 is designed as a circular arc with a radius R3 of 8 mm to 12 mm, preferably of approximately 10 mm.

[0048] The fourth region 16 is delimited radially inward from the axially outermost point 17 and has a height 26 here of 1.8 mm to 3 mm, preferably of approximately 2 mm.

[0049] FIG. 3 illustrates the advantageous scalability of the rim protection rib 9 that is made possible by the S twist. A detail of the axially outer contour 10, 11 of a pneumatic vehicle tire is shown. It can be the axially outer contour of the detail shown in FIG. 2. The dashed line shows an axially outer contour 10′, 11 for scaling of the rim protection rib 9 axially outward. Such a scaling is possible without the axially outer contour 11 of the sidewall 6 having to be changed radially outside of the rim protection rib 9.

LIST OF REFERENCE SIGNS

(Part of the Description)

[0050] 1 Tread [0051] 2 Belt [0052] 3 Carcass [0053] 4 Inner layer [0054] 5 Bead region [0055] 6 Sidewall [0056] 7 Bead core [0057] 8 Bead filler [0058] 9 Rim protection rib [0059] 10 Axially outer contour of the rim protection rib [0060] 11 Axially outer contour of the sidewall [0061] 12 First region [0062] 13 Second region [0063] 14 Tire equator [0064] 15 Third region [0065] 16 Fourth region [0066] 17 Axially outermost point of the rim protection rib [0067] 18 Belt bandage [0068] 19 Nominal rim width [0069] 20 Height [0070] 21 Height extent [0071] 22 First turning point [0072] 23 Radial distance [0073] 24 Second turning point [0074] 25 Radial distance [0075] 26 Height [0076] 28 Height [0077] 29 Thickness [0078] 30 Height extent [0079] Qh Cross-sectional height of the tire [0080] rR Radial direction [0081] aR Axial direction [0082] A Axially on the outside [0083] I Axially on the inside