CN100439130C

CN100439130C - Tyre for weight reduction and durability improvement

Info

Publication number: CN100439130C
Application number: CNB2004100871812A
Authority: CN
Inventors: 丁孝准; 曹日
Original assignee: Hankook Tire Co Ltd
Current assignee: Hankook Tire and Technology Co Ltd
Priority date: 2003-11-25
Filing date: 2004-11-04
Publication date: 2008-12-03
Anticipated expiration: 2024-11-04
Also published as: CN1621252A; KR20050050327A; KR100579532B1

Abstract

A tyre provided in the invention reduces volume of a tread portion, reduces weight, and is good for heat discharging and capable of improving wearing performance by forming a certain portion of a profile of an inner side of a tyre shoulder. In addition, the invention increases rigidity of the tread portion by connecting grain blocks of the tyre shoulder in a draw-bar manner, and has an effect good for operation and brake performances.

Description

Tyre for weight reduction and durability improvement

Invention field

The present invention relates to tyre for weight reduction and durability improvement, more particularly, tire involved in the present invention forms the second heavy degree of depth with the definite part of the inboard profile of tire shoulder portion groove, reduced the volume of fetus face thus, thereby can expendable weight and help heat release, thereby can improve the endurance quality of tire.

Background technology

Now, remove very-high performance (U1tra High Performance:UHP) tire, general performance (General performance) tire is that to be designed to the main line degree of depth be the extreme depth (Full depth) of benchmark at the groove majority of the side surface direction of tire shoulder.

In order to ensure methods such as the tyre surface volume of deciding the desired endurance quality of consumer, adopted to reduce tire shoulder portion, increase supplementing structure, increase bracing ply width.But, when reducing the tyre surface volume of tire shoulder portion, be that the groove of side surface direction is under the situation of extreme depth at the inboard profile of groove, the amount that the tyre surface volume can reduce is little.

And when increasing supplementing structure, because problem such as exposing of belt cord can take place on making, it is limited that the volume of tyre surface tire shoulder portion reduces.In addition, in order to improve endurance quality, the increase and the weight-saving trend of the increase of supplementing structure and bracing ply width run in the opposite direction, and become the major cause that cost rises.

The one of the main reasons that influences the fetus face rigidity is the rigidity of fetus face pattern block.Specifically, in order to increase the rigidity of tire shoulder portion, widely used mode is that pattern block is connected with the form of pattern block with stopping-off piece (tie bar).For example, referring to US Patent 5,746,849,5,439,340 etc.But this mode has partly increased rubber at stopping-off piece, thereby has increased weight, becomes the major cause that cost rises.

Therefore, need save cost and compared with prior art can improve endurance quality, the design concept also favourable by expendable weight other performances.

In the accompanying drawing, Fig. 1 has shown the profile of tire of endurance quality that is used to improve fetus face of prior art, and the profile of tire can be divided into circumferential profile (profile) and be the inboard profile of the groove of benchmark with the degree of depth of groove.Usually, in order to improve the endurance quality of bracing ply, between first bracing ply 11 and second bracing ply 12, insert bracing ply endless belt (tape) 13, because this bracing ply endless belt 13 makes the distal portion of second bracing ply 12 raise to some extent than the 1st bracing ply 11.And, in order to improve endurance quality, if when increasing auxiliary bracing ply 14, will reduce the volume of tire shoulder portion, the end portion of second bracing ply 12 near or surpass inboard profile according to the groove of the concept design of extreme depth, can cause that then belt cord exposes the problem of (back exposed cord).

Summary of the invention

The present invention proposes for the problems referred to above that solve prior art, the objective of the invention is to, the inboard profile of the groove by improving tire, reduce the volume of tire shoulder portion, finally can reach the weight-saving purpose, simultaneously, provide and to save cost and have good road-holding property and the tire of deceleration and stopping performance.

According to the present invention, a kind of tyre for weight reduction and durability improvement is provided, in the inboard profile of the groove of tire protector, the groove of the side surface direction of tire shoulder portion comprises the second heavy degree of depth part with different depth with respect to the inboard profile of tread groove, and have first radius and second radius of the inboard profile of tread groove, the described second heavy degree of depth partly has the 3rd radius of the inboard profile of tread groove, its starting point is near the tire center equatorial plane one side, and with the starting point of bracing ply endless belt at same place, terminal point is near the tire shoulder side, and with the terminal point of second bracing ply at same place.

Description of drawings

Fig. 1 is the part amplification profile of tire protector portion in the past;

Fig. 2 is the part amplification profile according to tire protector of the present invention portion.

DETAILED DESCRIPTION OF THE PREFERRED

The present invention is a kind of tire that improves lightweight and durability, it is characterized by, form in the inboard profile of tread groove of the second heavy degree of depth in the degree of depth the groove of the side surface direction of tire tire shoulder portion, the first radius TR1 of the inboard profile of tread groove is identical with the corresponding tread radius of the inboard profile of existing tread of tyre groove with the second radius TR2, the starting point place that makes second heavy degree of depth part is that the starting point of the inboard profile radius of the tread groove part that is TR3 and the starting point of bracing ply endless belt 23 are same point, and the terminal point of the terminal point and second bracing ply 22 is designed to same point.

Especially, as mentioned above, be 1.0 to 1.6mm as the difference of the 3rd radius TR3 of the inboard profile of the second radius TR2 of the inboard profile of the tread groove of the difference of the above-mentioned second heavy degree of depth and tread groove.

In the accompanying drawing, Fig. 2 has shown the inboard profile according to the tread groove of the rigidity that can improve tire protector portion of the present invention, identical in the inboard profile of the first radius TR1 of the inboard profile of this tread groove and the second radius TR2 and existing tread of tyre groove, the starting point of part of the 3rd radius TR3 of inboard profile with tread groove is near the tire center equatorial plane one side, and with the starting point of bracing ply endless belt 23 be same point, terminal point 26 is near the tire shoulder sides, with the terminal point of second bracing ply 22 be same point.This also can be different according to the specification difference.Symbol 21 expressions first bracing ply among Fig. 2, symbol 22 expressions second bracing ply, symbol 24 is to replenish bracing ply.

And the 3rd radius TR3 of the inboard profile of tread groove is TR2+a, than the big 1.0mm to 1.6mm of TR2.Here, the minimum value 1.0mm of a is a value of considering the effect that reduces effect and lightweight and endurance quality of tyre surface volume, because the extreme depth of tread wear indicating device (Tread wear indicator) is 1.6mm, so maxim 1.6mm is a value of having considered the tyre performance after the wearing and tearing.

By the inboard profile of groove of the present invention, with respect to extreme depth, the degree of depth of the second heavy degree of depth part is less, so the degree of its depth difference can significantly reduce the volume of tire shoulder portion, and this can go far towards weight-saving and realize.According to the difference of specification, relievable amount has certain difference, and its degree that alleviates of tire that specification is big more is big more.

What the durability of tire was had the greatest impact is cal val, and heat-producing mainly is tread-rubber.Utilizing when of the present invention,, reduce heating by reducing the tyre surface volume of tire shoulder portion.And help heat release more, have the effect that improves tyre last greatly.

And, if utilize the inboard profile of such groove, be formed naturally, thereby increased the rigidity of tyre surface tread block and pattern block bonded assembly stopping-off piece form, favourable to road-holding property and deceleration and stopping performance.

Following table 1 and 2 is that profile of the present invention is used for the lightweight shown behind the specification 195/50R15H and the experimental result of travelling.Following table 1 is the situation that the goods of prior art adopt the contour design mode (extreme depth) of prior art.

Table 1 (weight-saving effect)

The prior art goods	The present invention	The effect that alleviates
The prior art goods	The present invention	The effect that alleviates	2.798kg	2.701kg	0.097kg

Table 2 (effect that indoor high-speed is travelled)

Condition	The running time of prior art products	The running time of product of the present invention	Improve effect
Condition	The running time of prior art products	The running time of product of the present invention	Improve effect	Program I	1. 54 minutes 2. 58 minutes	1. 64 minutes 2. 67 minutes	About 10 minutes
Program II	1. 68 minutes 2. 72 minutes	1. 104 minutes 2. 95 minutes	About 30 minutes	Program I	1. 54 minutes 2. 58 minutes	1. 64 minutes 2. 67 minutes	About 10 minutes
Program II	1. 68 minutes 2. 72 minutes	1. 104 minutes 2. 95 minutes	About 30 minutes	Program III	1. 45 minutes 2. 42 minutes	1. 61 minutes 2. 64 minutes	About 17 minutes

Above-mentioned driving conditions is the driving conditions of Volkswagen (masses) company defined.

Shown in above-mentioned table 1 and 2, the possibilities that alleviate of 100 grams are arranged approximately, according to the difference of the condition of running at high speed, have and assign to 30 minutes the effect of improving from 10 of minimum.

The present invention is improved to by the inboard profile with the groove of tire shoulder has the second heavy degree of depth, thereby can reduce the volume of tire face, reaches the purpose that alleviates, and, be conducive to heat release, have the effect that improves the tyres durable performance.

Claims

1. tyre for weight reduction and durability improvement, it is characterized in that, in the inboard profile of the groove of described tire protector, the groove of the side surface direction of tire shoulder portion comprises the second heavy degree of depth part with different depth with respect to the inboard profile of tread groove, and have first radius (TR1) and second radius (TR2) of the inboard profile of tread groove, the described second heavy degree of depth partly has the 3rd radius (TR3) of the inboard profile of tread groove, its starting point is near the tire center equatorial plane one side, and with the starting point of bracing ply endless belt (23) at same place, terminal point is near the tire shoulder side, and with the terminal point of second bracing ply (22) at same place.

2. tyre for weight reduction and durability improvement as claimed in claim 1, it is characterized in that, poor as the double degree of depth, second radius (TR2) of the inboard profile of described tread groove is 1.0mm to 1.6mm with the difference of the 3rd radius (TR3) of the inboard profile of tread groove.