CN-117341395-B - Anti-bias wear low-rolling-resistance heavy-duty tire

CN117341395BCN 117341395 BCN117341395 BCN 117341395BCN-117341395-B

Abstract

The invention relates to the technical field of tires, and discloses an anti-eccentric low-rolling-resistance heavy-duty tire, wherein the radial distance from a tread center point A to an intersection point B of a groove wall on the outer side of a pattern groove and a tread forms a rolling radius diameter difference h1, the radial distance from the tread center point A to a tire shoulder point C forms a rolling radius diameter difference h2, the distance L from the intersection point B to the tire shoulder point C is the width of a pattern rib, and the ratio of the difference value of the rolling radius diameter difference h2 and the rolling radius diameter difference h1 to the width L of the pattern rib is 0.08-0.13. Through the adjustment of the tire running surface diameter difference, the relation between the setting of the protective groove and the running surface diameter difference is regulated, the relative slippage of the tire shoulder relative to the rubber in the middle of the tire crown is fully reduced, the anti-eccentric wear performance of the tire is effectively improved, and meanwhile, the wear performance of the tire is ensured.

Inventors

SUN LIJUAN
HUANG XUEHAI
HUANG CHUNLIAN
HUANG YAOHUA

Assignees

安徽佳通乘用子午线轮胎有限公司

Dates

Publication Date: 20260512
Application Date: 20231012

Claims (2)

1. An anti-eccentric wear low-rolling-resistance heavy-duty tire comprises a tread, a pair of first main grooves and a pair of second main grooves which are circumferentially arranged on the tread, and ribs, wherein the two first main grooves are symmetrically arranged about a tire center plane, the two second main grooves are symmetrically arranged about the tire center plane, the second main grooves are axially outside the first main grooves, and the ribs are axially outside the second main grooves, and the anti-eccentric wear low-rolling-resistance heavy-duty tire is characterized in that a radial distance from a tread center point A to an intersection point B of a groove wall outside the second main grooves and the tread forms a rolling radius diameter difference h1, a radial distance from the tread center point A to a tire shoulder point C forms a tire shoulder rolling radius diameter difference h2, a distance L from the intersection point B to the tire shoulder point C is the width of the ribs, and the ratio of a difference value between the rolling radius diameter difference h2 and the rolling radius diameter difference L is 0.08-0.13, namely (h 2-h 1)/L is more than or equal to 0.13; The three-dimensional sipe is arranged on the rib along the circumferential direction of the tire, the three-dimensional sipe is wavy in the section of the tire, the groove at the joint of the three-dimensional sipe and the surface of the tread is called a protection groove, the thickness of the cutter groove body is equal to the width of the protection groove, the thickness of the cutter groove body is s, the amplitude width w of the three-dimensional sipe is 1.8 times to 3.0 times of the thickness s, namely, the amplitude width w is 1.8 times to 3.0 times of the thickness s.
2. The bias wear resistant low rolling resistance truck tire according to claim 1, wherein the radial depth d is smaller than the depth d21 of the first main groove and the depth d22 of the second main groove, the three-dimensional sipe bottom is composed of a first circular arc r1 and a second circular arc r2, the first circular arc r1 is tangent to the first sipe body line segment p1, the second circular arc r2 is tangent to the second sipe body line segment p2, and the sipe bottom pattern thickness t is at least 1mm larger than the sipe body thickness s, namely t is equal to or larger than s+1mm.

Description

Anti-bias wear low-rolling-resistance heavy-duty tire Technical Field The invention relates to the technical field of tires, in particular to an anti-bias low-rolling-resistance heavy-duty tire. Background In the process of running the truck tire, because the tire inflation pressure and the load force are large and the rolling radius of the running surface from the middle to the shoulder is inconsistent, relative sliding is generated, the phenomenon that the shoulder rubber is worn relatively fast compared with the middle rubber is easy to occur, and the phenomenon is called uneven wear, and the uneven wear also reduces the service life of the tire. Similarly, during running, the tire generates a phenomenon of energy dissipation due to the deformation of the tire and the hysteresis characteristics of the rubber itself, which is called tire rolling resistance. Tire rolling resistance is related to fuel economy and environmental protection of the vehicle. In order to solve the problem of uneven wear, the diameter difference of the rolling radius of the running surface is reduced or a shoulder protection groove is added to improve, however, the reduction of the diameter difference increases the contact length between the shoulder and the ground, so that the rolling resistance of the tire is increased, and the steering performance of the tire is also deteriorated due to the reduction of the diameter difference because of the influence of transverse force for the guiding position and the trailer position of the tire. The shoulder protection groove is added, the part which is easy to generate shoulder eccentric wear is divided from the main body of the running surface, the relative sliding action of the shoulder and the main body is relieved, the possibility of the occurrence of the eccentric wear can be reduced to a certain extent, but the shoulder rib is divided by the protection groove, so that the rigidity of the part is reduced, and the rolling resistance of the tire is increased and the abrasion life is reduced. And the ribs with the shoulders divided by the protective grooves are easy to tear when being squeezed and scratched by road foreign matters. Because of the interaction and mutual influence among the service performances of the tire, the parameters affecting the partial wear performance can also affect the rolling resistance, the crack resistance and other performances of the tire. The prior art mostly adopts the mode of adjusting the tread crown arc and adding a protection ditch to reduce the uneven wear. However, the adjustment of the crown arc and the addition of the guard groove are likely to cause an increase in rolling resistance. The adjustment of the crown arc simultaneously influences the steering of the tire, and the guiding and trailer tire performance is more obvious. The shoulder protection ditch is easy to be torn by a fine shoulder strip when being squeezed and scratched by road foreign matters, so that early failure of the tire and reduction of the abrasion life are caused. While the prior art provides for the formation of a protective groove bottom to minimize the risk of tearing, this effect is limited. Meanwhile, the relationship between the radial difference of the tire rolling radius and the radial difference of the tire rolling radius is not considered for increasing the protection groove. Disclosure of Invention In order to solve the technical problems, the invention provides the bias-wear-resistant low-rolling-resistance heavy-duty tire, and the relationship between the running surface diameter difference and the protection groove is arranged, so that the three-dimensional sipe design of the protection groove is increased, the bias wear resistance and the crack resistance of the tire are fully improved, and the rolling resistance is reduced. In order to solve the technical problems, the invention adopts the following technical scheme: an anti-eccentric low-rolling-resistance heavy-duty tire comprises a tread, a pair of first main grooves and a pair of second main grooves which are circumferentially arranged on the tread, and ribs, wherein the two first main grooves are symmetrically arranged about a tire center plane, the two second main grooves are symmetrically arranged about the tire center plane, the second main grooves are axially outside the first main grooves, and the ribs are axially outside the second main grooves, and the anti-eccentric low-rolling-resistance heavy-duty tire is characterized in that a radial distance from a tread center point A to an intersection point B of a groove outer side wall and the tread forms a rolling radius diameter difference h1, a radial distance from the tread center point A to a tire shoulder point C forms a rolling radius diameter difference h2, a distance L from the intersection point B to the tire shoulder point C is the width of the ribs, and the ratio of a difference value between the rolling radius diameter difference h2 and the