CN-122008739-A - High-control-performance radial tire for new energy automobile and manufacturing method

Abstract

The invention relates to the technical field of tire manufacturing, and discloses a radial tire with high control performance for a new energy automobile and a manufacturing method thereof. The tire is provided with an aramid U-shaped wrapping cloth at the tire bead, and the U-shaped wrapping cloth is attached to the apex and is of a U-shaped structure, and covers the inner surface and the outer surface of the apex. The thickness of the U-shaped wrapping cloth is 1.0-1.4 mm, and the angle alpha of the cord line is 40-50 degrees; the inner end point of the triangular glue is at least 10mm higher than the top end of the triangular glue in the radial direction, the outer end point is at least 10mm radially below the apex. In the manufacturing process, the U-shaped wrapping cloth is required to be positioned and bonded at one time at the same bonding station to form a tire bead composite part, and the tire bead composite part is assembled with a tire body for molding and vulcanization shaping. The scheme can optimize the rigidity transition and stress distribution of the tire bead and the tire side, improve the torsional rigidity and the dry-wet land control/braking performance, reduce the risk of end point superposition and gum shortage and separation, and is beneficial to mass production consistency and low rolling resistance design.

Inventors

• YANG HETAO
• REN YANPING
• LI NANA
• YAO JIAHUI

Assignees

• 中策橡胶集团股份有限公司
• 杭州海潮橡胶有限公司

Dates

Publication Date

20260512

Application Date

20260401

Claims (7)

1. 1. The radial tire with high control performance for the new energy automobile comprises a tread, a sidewall, a carcass ply and a tire bead, wherein the tire bead comprises a bead ring and a triangular rubber arranged on the periphery of the bead ring, and is characterized in that the tire bead is provided with a U-shaped Bao Buwei aramid fiber reinforced fabric layer, and the U-shaped flipper is attached to the triangular rubber and forms a U-shaped structure, so that the inner side and the outer side of the U-shaped flipper are respectively positioned at the inner side and the outer side of the tire bead; the thickness of the U-shaped wrapping cloth is 1.0-1.4 mm, and the cord angle alpha of the U-shaped wrapping cloth is 40-50 degrees; The inner end point of the U-shaped wrapping cloth is higher than the apex of the apex by at least 10mm in the radial direction of the tire, and the outer end point of the U-shaped wrapping cloth is lower than the apex of the apex by at least 10mm in the radial direction of the tire.
2. 2. The high handling performance radial tire for a new energy vehicle of claim 1, wherein said aramid fiber is 1680dtex/2.
3. 3. The high handling performance radial tire for a new energy vehicle according to claim 1, wherein the thickness of the U-shaped wrap is 1.2mm and the cord angle α is 45 °.
4. 4. The high handling performance radial tire for a new energy vehicle of claim 1, wherein said U-wrap is wrapped over the entire outer and inner surfaces of said apex.
5. 5. The high-handling performance radial tire for a new energy automobile according to claim 1, wherein the U-shaped wrapping cloth is adhered to the triangle glue through a rubber-covered layer, and the rubber-covered layer is a rubber-covered layer after dipping treatment or an adhesive interface formed after vulcanization.
6. 6. The high handling performance radial tire for a new energy vehicle of claim 1, wherein the U-wrap, bead and apex together form a bead rigid transition zone allowing the sidewall to be relatively thinned while maintaining handling response to reduce rolling resistance.
7. 7. A method of manufacturing a tyre as claimed in any one of claims 1 to 6, comprising the steps of: S1, forming a bead ring and forming triangular glue outside the bead ring Zhou Chengxing; S2, positioning the triangular glue and the bead ring at one time at the same bonding station, and bonding and wrapping the aramid U-shaped wrapping cloth on the triangular glue to form a tire bead composite part; Wherein the thickness of the U-shaped wrapping cloth is 1.0-1.4 mm, and the cord angle alpha is 40-50 degrees. And controlling the inner side end point to be at least 10mm higher than the top end of the triangular glue and the outer side end point to be at least 10mm lower than the top end of the triangular glue; S3, assembling the bead complex with a carcass ply; S4, completing tire molding and vulcanization shaping.

Description

High-control-performance radial tire for new energy automobile and manufacturing method Technical Field The invention relates to the technical field of tire manufacturing, in particular to a high-steering performance radial tire for a new energy automobile and a manufacturing method thereof. Background The tire bead area is an important structural area where the tire is reliably assembled with the rim, transmitting drive/brake torque and receiving lateral forces. The whole vehicle platform represented by a passenger vehicle (especially a new energy vehicle) has typical working condition characteristics of large preparation quality, low-speed and large torque output, frequent acceleration/braking, high transient transverse load and the like, so that the contradiction between the control response and the durability reliability of the tire is more prominent. To improve handling, it is often desirable to increase the torsional/lateral stiffness of the bead and sidewall transition regions in engineering, but excessive stiffness may also cause poor comfort, localized stress concentrations, "starved/bubble/delamination" defects caused by bead component end-point stacking, and manufacturing uniformity issues, thereby reducing high speed durability and low air pressure durability. Based on the above contradiction, the prior art is optimized for a balance between handling and durability with a wide range of bead area-surrounding apexes (bead filler/bead apex/bead core), carcass ply turnup structures, chafers/reinforcements, and their end points "differences (differences)". For example, chinese patent CN210416096U discloses a steel wire carcass UHP tire, the bead structure of which comprises a bead ring, a bead ring-coated apex and a tackifying sheet matched with the apex, and defines the radial positional relationship between the inner end point and the outer end point of the tackifying sheet, the apex end point and the carcass turnup end point, and simultaneously, the patent also sets a reinforcing layer and provides the radial distance between the upper and lower positioning points of the reinforcing layer and the apex end point/carcass turnup end point and the range of the included angle between the reinforcing layer and the circumferential direction of the tire, thereby alleviating the rim-pull, stress concentration and improving the handling and durability. Chinese patent CN103738122a discloses an all steel radial tire with two layers of U-shaped steel wire reinforced beads and a method for preparing the same. The first steel wire cord fabric reinforcing layer and the second steel wire cord fabric reinforcing layer are arranged in a tire bead area, the section of the first steel wire cord fabric reinforcing layer, which bypasses the bead ring, is U-shaped, the inner end point of the first steel wire cord fabric reinforcing layer is higher than the turn-up end point of the carcass ply, the outer end point of the first steel wire cord fabric reinforcing layer is lower than the turn-up end point of the carcass ply, the preferable range of the end point level difference (for example, the outer end point level difference from 10mm to 20mm, the inner end point level difference from 2mm to 10mm and the like) is further provided, and the second steel wire cord fabric reinforcing layer is U-shaped and forms dislocation with the end point of the first reinforcing layer. Chinese patent CN201472075U discloses an improved tire bead structure, which is provided with a single nylon cloth between the outer sides of the upper and lower bead filler and bead ring and the tire body, and performs parameter control on the difference level (for example, 30-40 mm) between the outer end point of the nylon cloth and the turn-up end point of the tire body, the difference level between Bao Duandian in the nylon cloth and the end point of the tire body, and the like, so as to improve the rigidity of the tire bead, reduce the sinking and deformation amount in the overload running state, reduce the heat generation speed and improve the strength of the tire bead. It can be seen from the above prior art that a common path of improvement in the industry for the bead area mainly includes providing a tackifying sheet/reinforcing layer/wrap or wirecord reinforcement, etc., near the bead apex and carcass turnup end points, and by controlling the radial "step" between the end point position of the reinforcing member and the key feature points of the carcass turnup end points, apex end points, etc., to disperse stresses, reduce end point overlap and improve durability and handling. However, the above-mentioned scheme may still have several disadvantages when facing the comprehensive requirements of "high control+low energy consumption+high consistency mass production" of new energy automobiles, on one hand, some schemes adopt a wirecord fabric reinforcing layer or a wirecord carcass structure, while being beneficial to improving local rigidity, the pr