Claims:1. A tyre comprising:
a tread portion that remains in contact with a road surface, the tread portion further comprising at least two grooves running in the circumferential direction of the tyre; and
repeating array of serrations provided at the base of the circumferential grooves to considerably reduce noise in the tyre when the tread portion comes in contact with the road surface.
2. A tyre according to claim 1, wherein the serrations are shaped like an inverted V resembling the toothed edge of a saw.
3. A tyre according to claim 1, wherein the serrations are vertically engraved along the base of the circumferential grooves at a depth ranging from 0.5 mm to 1 mm.
4. A tyre according to claim 1, wherein the serrations at separated by a gap ranging from 0.8 mm to 1.5 mm.
5. A tyre according to claim 1, wherein the serrations are inclined with the radial axis of the tyre at an angle of serration a.
6. A tyre according to claim 1, wherein the angle of serration a ranges from 30 degrees to 40 degrees.
7. A tyre according to claim 1, wherein a tread wear indicator is provided within the circumferential grooves of the tread portion designed to give visual indication of the degree of wear of the tread portion.
8. A tyre according to claim 8, wherein the tread wear indicator comprises of a minimum height of 1.6 mm tall raised bars molded across the bottom of each circumferential groove.
9. A tyre according to claim 8, wherein the serrations are absent on either sides of the tread wear indicator in a predetermined portion providing a gap between the serrations and the tread wear indicator ranging from 7 mm to 10 mm.
10. A tyre according to claim 9, wherein the array of serrations are ended by enclosing them with an inverted U-shaped line across the length of the width of the circumferential grooves. , Description:CROSS-REFERENCE TO RELATED APPLICATIONS AND PRIORITY
[001] The present application does not claim priority from any patent application.

TECHNICAL FIELD
[002] The present invention relates to a tread pattern of a tyre, and more specifically, to a bottom groove of the tyre and its effect on the tyre noise characteristics.
BACKGROUND ART
[003] A tyre tread is generally comprised of circumferential grooves as well as lateral grooves. The non-skid depth or the depth of the circumferential grooves of a tyre is generally decided based on the mileage requirement of the tyre.
[004] Noise in tyre comes when the tyre tread comes in contact with the road surface. During the contact with the road surface, air is trapped in between the grooves of the tyre and the road surface. Because of this, air gets compressed inside the grooves of the tread. Higher the tread depth in the tyre, more is the volume of air inside the tyre and higher is the noise.
[005] Although various tyre treads with high tread depth are known, however, the prior art fails to teach or even suggest pattern of the tyre tread which minimizes the noise in the tyres with high tread depth.
SUMMARY OF THE INVENTION
[006] Before the present system(s) are described, it is to be understood that this application is not limited to the particular system(s) described, as there can be multiple possible embodiments, which are not expressly illustrated in the present disclosures. It is also to be understood that the terminology used in the description is for the purpose of describing the particular implementations or versions or embodiments only and is not intended to limit the scope of the present application. This summary is provided to introduce aspects related to a tread pattern of a tyre. This summary is not intended to identify essential features of the claimed subject matter nor is it intended for use in determining or limiting the scope of the claimed subject matter.
[007] In order to solve the problems described above and to achieve the object, repeating array of serrations are provided in circumferential grooves of a tyre tread. The array of serrations extends along the circumferential direction of the tyre at the base of the grooves. The serrations are shaped like an inverted V resembling the toothed edge of a saw. Also, the serrations are vertically engraved along the base of the circumferential grooves. All the serrations are inclined with the radial axis of the tyre at an ‘angle of serration’ a, and therefore, all the serrations are parallel to each other. Further, all the grooves in the tyre tread have same type of serrations. In a normal passenger car tyre, tread generally has two to four circumferential grooves.
[008] Another feature of the present invention is that the serrations are absent on both sides of a Tread Wear Indicator. The serrations are ended by enclosing them with an inverted U-shaped line across the length of the groove width.
[009] An object of the present invention is to provide a tyre having high tread depth and at the same time, minimizing the noise in the tyre when the tyre tread is in contact with the road surface. The objects of the invention will become clearer from the full description and the drawings present in the contents of the article.
BRIEF DESCRIPTION OF THE DRAWINGS
[010] The foregoing detailed description of embodiments is better understood when read in conjunction with the appended drawings. For the purpose of illustration of the present subject matter, an example of construction of the present subject matter is provided as figures; however, the invention is not limited to the specific method and system disclosed in the document and the figures.
[011] It is therefore to be noted that the appended drawings illustrate only typical embodiments of this invention and are therefore not to be considered for limiting its scope, for the invention may admit to other equally effective embodiments.
[012] Figure 1 shows the perspective view of the tyre including the serrations in the tread groove base.
[013] Figure 2 shows the front view of the grooves as shown in Figure 1.
[014] Figure 3 shows the two-dimensional view of Figure 2 as well as serrations and Tread Wear Indicator marked.
[015] Figure 4 shows the perspective view of the serrations as can be seen in the tyre.
[016] Figure 5 shows the two-dimensional view of the serrations as well as the section details of the serrations.
[017] Figure 6 shows the perspective view of the Tread Wear Indicator and the gap in between the serrations.
[018] Figure 7 shows the two-dimensional view of the Tread Wear Indicator as well as the section details.
[019] Figure 8 provides parameters of the constructional features and various elements according to the aspects of the present invention
DETAILED DESCRIPTION
[020] Some embodiments of this disclosure, illustrating all its features, will now be discussed in detail. The words "comprising," "having," "containing," and "including," and other forms thereof, are intended to be equivalent in meaning and be open ended in that an item or items following any one of these words is not meant to be an exhaustive listing of such item or items, or meant to be limited to only the listed item or items. It must also be noted that as used herein, the singular forms "a," "an," and "the" include plural references unless the context clearly dictates otherwise. Although any system similar or equivalent to those described herein can be used in the practice or testing of embodiments of the present disclosure, the exemplary system are now described. The disclosed embodiments are merely examples of the disclosure, which may be embodied in various forms. The disclosed embodiments can be used as standalone or in combination. Various modifications to the embodiment will be readily apparent to those skilled in the art and the generic principles herein may be applied to other embodiments. However, one of ordinary skill in the art will readily recognize that the present disclosure is not intended to be limited to the embodiments described, but is to be accorded the widest scope consistent with the principles and features described herein.
[021] Referring to Figure 1, which is a perspective view illustrating a tyre 10, the tyre 10 includes a tread portion 12 that remains in contact with a road surface. The tread portion 12 of the tyre 10 comprises of grooves running in the circumferential direction of the tyre 10, hereinafter referred to as circumferential grooves. In general, there are two to four circumferential grooves in a normal passenger car tyre.
[022] The tyre 10 as shown in Figure 1 has three circumferential grooves 14, 16, 18. Groove 16 is the central groove while grooves 14 and 18 are a pair of side grooves. Central groove 16 is at the equatorial plane of the tyre 10. Each of these grooves has a repeating array of serrations 34 present at the base of each groove as shown in Figures 3 to 7. The array of serrations 34 extend along the circumferential direction of the tyre 10 in the circumferential grooves.
[023] In Figure 2, which is an enlarged view of the tyre 10 as shown in Figure 1, is shown the front view of circumferential grooves 14, 16, 18 of the tread portion10.
[024] In Figure 3 is shown a two-dimensional view of Figure 2 as well as the array of serrations 34 and a Tread Wear Indicator 36. The Tread Wear Indicator 36 refers to the projections within the circumferential grooves of the tyre tread designed to give visual indication of the degree of wear of the tyre tread. Further, ‘angle of serration’ a refers to the angle in between radial axis of the tyre and the serrations.
[025] According to an aspect of the invention, the serrations are absent in portions 38 on both sides of the Tread Wear Indicator 36 in each groove, as shown in Figure 6. In Figure 3, the portions where the serrations are not present are marked 38a, 38b, 38c, 38d, 38e and 38 f.
[026] According to an aspect of the invention, the gap D in between end of the serrations and Tread Wear Indicator 36 is in a range of 7 mm to 10 mm, as shown in Figure 6 and Figure 8. Accordingly, the serrations are absent in the regions 38a to 38f at a distance D ranging from 7 mm to 10 mm on each side of the Tread Wear Indicator 36.
[027] Further, as shown in Figures 3 and 4, all the grooves have same type of serrations and the serrations are present at the base of each groove. The detailed constructional features of the serrations in the grooves are further depicted in Figures 4 to 8.
[028] In Figure 4 is shown the perspective view of a portion of the array of serrations 34 as can be seen in the grooves of the tyre. According to an aspect of the invention, each of the serrations is spaced at a distance B ranging from 0.8 mm to 1.5 mm from an adjacent serration. The serrations are vertically engraved along the base of the circumferential tread grooves.
[029] In Figure 5 is shown the two-dimensional view of a portion of the array of serrations 34 as well as the ‘angle of serration’ a. According to an aspect of the invention, all the serrations in the circumferential grooves are inclined with the radial axis of the tyre at the same ‘angle of serration’ a, and therefore, all the serrations are parallel to each other. Further, the value of a can be greater than or equal to 30 degrees or less than or equal to 40 degrees, according to the various aspects of the invention.
[030] In Figure 5, section details of serrations are shown as in the enlarged section X-X of the array of serrations 34. The depth A of each serration is defined in the range of 0.5 mm to 1 mm.
[031] Further, according to an aspect of the invention, as shown in section X-X enlarged view of Figure 5 and in Figure 6, all the serrations are shaped like an inverted V resembling the toothed edge of a saw.
[032] Figure 6 shows the perspective view of the Tread Wear Indicator 36. According to an aspect of the invention, the width E of each of the Tread Wear Indicator 36 is in the range of 7 mm to 8 mm.
[033] In Figure 7, the two-dimensional view and the sectional view of the Tread Wear Indicator 36 is shown, the Tread Wear Indicator 36 comprising of a minimum height of 1.6 mm tall raised bars molded across the bottom of each circumferential tread groove from shoulder to shoulder.
[034] In Figure 6 and in Section P-P enlarged view of Figure 7, according to another aspect of the invention, the array of serrations 34 is shown having been ended by enclosing them with an inverted U-shaped line across the length of the groove width. According to an aspect of the invention, the radius F of section P-P enlarged is in the range from 0.5 mm to 1 mm.
[035] In Figure 8, the parameters of constructional features and various elements according to the aspects of the invention is provided. According to an aspect of the present invention, the gap D in between end of serration and Tread Wear Indicator 36 is constant at all the places of its existence in the circumferential grooves of a tyre.
[036] For instance, while the various designs have been described with respect to structure and constructional features of the preferred embodiments of the invention, novel aspects of the embodiments described may be incorporated in other designs. Also, the description is made with respect to exemplary embodiments only and it should be understood that the arrangement of many of the design blocks and components may be changed without departing from the scope of an appended claim. Also, it should be understood that in alternate embodiments claimed in the claims, many of the components described with respect to the exemplary embodiments may be withheld or may be replaced by equivalent structures. Numerous modifications and adaptations of the system of the present invention will be apparent to those skilled in the art, and thus it is intended by the appended claims to cover all such modifications and adaptations which fall within the true spirit and scope of this invention.