CN1313291C

CN1313291C - Method for controlling PRAT as tyre characteristic

Info

Publication number: CN1313291C
Application number: CNB2004100594025A
Authority: CN
Inventors: 徐宗范
Original assignee: Hankook Tire Co Ltd
Current assignee: Hankook Tire and Technology Co Ltd
Priority date: 2003-07-09
Filing date: 2004-06-18
Publication date: 2007-05-02
Anticipated expiration: 2024-06-18
Also published as: KR20050006652A; KR100502555B1; CN1576065A

Abstract

A control method of PRAT(Plysteer Residual Aligning Torque), a characteristic of a tire is provided to reduce lowering in freedom of pattern design caused by the lowering of other performances, in changing the angle of a horizontal groove for PRAT control of in the initial pattern design and to reduce the re-manufacturing cost and a loss in time followed by the change of the angle of the horizontal groove for PRAT control after manufacturing a mold. In a control method of PRAT, a characteristic of a tire(10) in relation to the straight traveling performance of a vehicle, a slot(16) is designed to a block(14) adjacent to a horizontal groove(12) of the tire. The slot is selectively designed to a block or a pitch in the whole pitches of a row of blocks or one rib of the tire. Slots are designed to each row of blocks in a symmetrical shape around the center of the tire. Two circumferential slots are inserted into one block.

Description

Control is as the method for the PRAT of tire characteristics

Technical field

The present invention relates to PRAT (the residual rectification moment of torsion of Plysteer Residual AligningTorque:Plysteer as tire characteristics.Plysteer refers in the quasistatic slew test tyre slip angle when side force is zero) control method.More particularly, the present invention relates to a kind of PRAT control method, this method by with the pattern block (block) of tire transverse concave groove adjacency in easily embed or remove slit, overcome the problem that must make mould again for tyre P RAT is realized desirable control.

Technical background

The performance of running stability that tire advances always be by with the key property of the tire that shows cooperating of vehicle, be directly connected to the safety of vehicle.In vehicle manufacturing sector, in order to guarantee this performance, all check by all vehicles to batch manufacturing, make and have only performance could deliver goods through the vehicle of checking.

With regard to tire, the principal particulars value relevant with performance of running stability has tapering and PRAT, and tapering is the value that the geometry imparity according to tire produces, and is the characteristic that substantial connection is arranged with the tire manufacturing.PRAT mainly is the design-calculated eigenwert that the imparity of the decorative pattern of the imparity of the steel cable that mainly uses according to the radial-ply tyre that injects air and tread shows.But the PRAT value is not that to get certain value all right, but will be according to obtaining suitable value with the coupling of each vehicle, and the technology of therefore controlling suitable value is unusual important techniques field for tire.

The method of control PRAT in the past is to control PRAT by the angle that changes the translot 61 in the decorative pattern shown in Fig. 6 and 7.But, the angle of decorative pattern (α, change β) can greatly have influence on other performances, that is, and wearing and tearing, noise, brake etc.Therefore, changing PRAT can produce a lot of restrictions during Pattern Design to the initial stage, thus the degree of freedom when having reduced Pattern Design.

If increase rib (rib) away from the tire shoulder part of tire central authorities, perhaps increase from the angle of the transverse concave groove 61 of pattern block 62, can increase the value of PRAT, cause that vehicle tilts to the right.Otherwise, be positioned at tire central authorities and the middle intermediate rib of tire shoulder part if increase, perhaps increase the angle of the transverse concave groove 61 at pattern block 62 places, then can reduce the value of PRAT, cause that vehicle tilts to the left.Come vehicle is carried out suitable substance P RAT control according to such principle.In Fig. 6 and 7, symbol 63 expression tire belts, symbol 64 expression moulds (mold).

But in the said method, when changing the angle of transverse concave groove, needed mould in the time of must being produced on the tire making has again greatly been wasted funds and time, and the value of the change also difference because of decorative pattern is different, is attended by repeatedly tentative wrong shortcoming.

Summary of the invention

The objective of the invention is to, a kind of PRAT method of designing is provided, to alleviate two problems in the past.These two problems are, first, when designing at the decorative pattern initial stage, when changing the angle of transverse concave groove in order to control PRAT, because other performances are reduced, and produced the problem that the degree of freedom of Pattern Design reduces, second, after Mold Making well, be control PRAT, expense that the mould that causes is made again and the problem of the loss of time when changing the angle of transverse concave groove.

The invention relates to and control method, it is characterized in that as the PRAT of the tire characteristics of the performance of running stability of vehicle, with the pattern block of tire transverse concave groove adjacency in design slit is arranged.

Especially, purpose of the present invention can be by in all pitches (pitch) of rib of tire or pattern block row, only in a part of pitch or a part of pattern block optionally with the pattern block edge of transverse concave groove adjacency in the design slit realize.

And above-mentioned purpose of the present invention is by being benchmark with the tire center, in each pattern block row slit is set with the form of former point symmetry and realizes.

And above-mentioned purpose of the present invention can be by in a pattern block, and the slit that embeds two or three above circumferencial directions is realized.

Description of drawings

Fig. 1 is according to the present invention, for removing PRAT, with the pattern block face of the transverse concave groove adjacency of tire in the design slit tire and realize the part amplification view of the shape of this design-calculated mould;

Fig. 2 is the mode chart of the various slits seen from the A direction among Fig. 1;

Fig. 3 is the mode chart of the various slits seen from the B direction among Fig. 1;

Fig. 4 a to 4b be with the pattern block face of transverse concave groove adjacency in embed slit, the planar view of the tire that the configuration of its position has nothing in common with each other;

The chart of the PRAT value that changes along with slit quantity that Fig. 5 is in the tire of 195/65R15 specification to be measured;

Fig. 6 is the planar view of conventional tyre in the past;

Fig. 7 is the part amplification sectional view of conventional tyre in the past.

Concrete embodiment

Describe the present invention below with reference to the accompanying drawings in detail.

In the accompanying drawings, Fig. 1 is control PRAT according to of the present invention, with the pattern block face of the transverse concave groove adjacency of tire in be provided with the tire of slit and use the part amplification view of the shape of this design-calculated mould; Fig. 2 is the mode chart of the various slits seen from the A direction among Fig. 1; Fig. 3 is the mode chart of the various slits seen from the B direction among Fig. 1.

According to Fig. 1, specific embodiments of the invention are, with the face of the pattern block 14 of transverse concave groove 12 adjacency of tire 10 on design slit 16, change the PRAT characteristic, thereby realize desired PRAT control.Symbol 18 expression moulds among Fig. 1.

As shown in Figures 2 and 3,,, revise the mould that has made, can change PRAT simply and effectively according to desired PRAT though above-mentioned slit 16 can embed with various shapes.

As shown in Figures 2 and 3, the radial depth of slit 16 (L) can be set at the entire depth from 1mm to the groove, and (w1 w2) can decide according to the desired PRAT value and the outward appearance of decorative pattern with the lip-deep degree of depth (d1) its width.The quantity of slit 16 also is to decide according to PRAT and outward appearance.

In the accompanying drawing, Fig. 4 a to 4b be with the adjacent pattern block face of horizontal groove in embed the planar view of the tire that the position of slit, slit disposes differently, can from the row of the pattern block on each rib, select suitable slit embedded location.

Promptly, in the whole pitch of a rib or pattern block row, only in a part of pitch or a part of pattern block, optionally with the pattern block of transverse concave groove adjacency in embed slit, can be benchmark both with the tire center, list the embedding slit with the initial point symmetrical manner at each pattern block, also can in a pattern block, along the circumferential direction embed two or three above slits.

For example, Fig. 4 a (embodiment 1) embeds two slits in the pattern block face, and Fig. 4 b (embodiment 2) is four slits, and Fig. 4 c (embodiment 3) is to be to embed slit with the direction opposite with Fig. 4 b with the direction opposite with Fig. 4 a, Fig. 4 d (embodiment 4).In each pattern block row, be benchmark with the center of tire, adopting effect under the situation of former point symmetry is as shown in Figure 42 times of effect.

In the accompanying drawing, Fig. 5 shown in the tire of 195/65R15 specification, and with the PRAT that the quantity (embodiment 1～4 and comparative example (Fig. 6)) of slit changes, its variable quantity is 5[Nm to the maximum as can be known].And, also shown in a pattern block different according to the position of the slit that embeds and quantity, the variation characteristic of the direction of PRAT and size among the figure.

According to the present invention, the embedding of aforesaid slit, or under the situation about removing, even after the Mold Making well, also can obtain the PRAT value of desired tire easily by the repairing of mould, the problem of having to make again mould in order to control PRAT has obtained the actv. improvement.

Claims

1. a control is as the method for the PRAT of tire characteristics, and this PRAT is the tire characteristics relevant with the performance of running stability that advances of vehicle always, it is characterized in that, with the pattern block edge of the transverse concave groove adjacency of tire in slit is set.

2. control as claimed in claim 1 is characterized in that as the method for the PRAT of tire characteristics, at a flank of tire, or in whole pitches of pattern block row, in a part of pitch or described slit only optionally is set in a part of pattern block.

3. control as claimed in claim 2 is characterized in that as the method for the PRAT of tire characteristics described method is a benchmark with the tire center, in each pattern block row described slit is set with the form of former point symmetry.