JPH0617602Y2 - Asymmetric tire - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to an asymmetric tire that can improve skid and ride comfort.

[Conventional technology and problems to be solved]

As the maintenance of highways progresses, high-speed running characteristics of automobile tires are demanded. Therefore, tires are flattened to widen the tread width, and high-speed steering stability and grip performance are being improved. However, tires having a particularly wide tread of this kind are generally more likely to skid than other types of tires and have poor riding comfort. , None of them have been satisfactory.

An object of the present invention is to provide an asymmetric tire which can solve such problems and can be suitably used especially for a wide tire.

[Means for solving the problem]

The present invention is directed to a pair of circumferential center grooves extending linearly in the tire circumferential direction on both sides of the tire equatorial plane and arranged at equal intervals with the tire equatorial plane, and a tire shaft of the circumferential center groove. And a pair of circumferential side grooves extending outward in the tire circumferential direction on a straight line, and forming a V shape from one of the circumferential center grooves toward both side ends of the tread, and the tire circumferential direction It is an asymmetric tire having a tread pattern that is asymmetric with respect to the equatorial plane of the tire by providing a straight lateral groove that extends obliquely with respect to.

[Action]

By including the circumferential center grooves on both sides of the tire equatorial surface at equal intervals, the tread rigidity is equalized on the left and right sides of the tire equatorial surface, and the circumferential groove extending on the tire equatorial surface where the ground contact pressure is large. The uneven wear of the peripheral edge of the groove caused when the groove is provided is prevented, and the straight central groove and the circumferential side groove prevent side slippage and drainage is enhanced to improve wet grip performance.

The lateral groove is a continuous groove extending in a V shape from one circumferential center groove to both side ends of the tread. As a result, it is obvious that the lateral groove also passes through the equator between the circumferential central grooves, and drainage and water film cutting at the tire equator are better than when the lateral groove is not provided at the equator, which is obvious. Helps to improve skiing and prevent skidding.

Further, such a continuous lateral groove forms a block-shaped tread portion in cooperation with the circumferential center groove and the circumferential side groove, reduces bending rigidity in the radial direction on the tire circumferential surface, and imparts flexibility. And improve riding comfort. In addition, the V-shaped lateral groove not only enhances the appearance of the tire, but also balances the ground contact performance in the left and right regions of the tire, prevents side slippage, and contributes to noise reduction because the block has a parallelogram shape. To do.

Further, the tread portion has an asymmetrical tread pattern in which the lateral groove extends in a V shape from one of the circumferential center grooves separated from the tire equatorial plane toward the side ends on both sides of the tread. By not arranging the one circumferential center groove in the axially outer portion of the tire on which a large load acts, it is possible to position the V-shaped intersection where abrasion resistance tends to decrease in the inner portion,
It can improve the durability of the tire. In addition, it helps remove the influence of plysteer that causes the one-sided flow of the vehicle that tends to occur due to the orientation of the cord of the uppermost ply of the belt layer, etc.
It acts as an asymmetric tire.

〔Example〕

 An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, the asymmetric tire 1 has a tread portion P,
The tire equatorial plane C is sandwiched between the tire equatorial plane C and a straight line extending in the tire circumferential direction on both sides of the tire equatorial plane C.
A pair of circumferential center grooves G2, G3 and this circumferential center groove G
2 and G3 are arranged on the outer side in the tire axial direction and have a pair of circumferential side grooves G1 and G4 extending linearly in the tire circumferential direction, and from one circumferential center groove G2 on one side end to both sides of the tread. The tread pattern is asymmetric with respect to the tire equatorial plane C by providing straight lateral grooves K1 and K2 that make a V shape toward the tire circumferential direction and extend.

In this example, the circumferential grooves G1 and G4 are also arranged symmetrically with respect to the tire equator C, and the circumferential central groove G is also provided.
2, G3 are separated from the tire equatorial plane C by a small distance, and the groove width Gg of each of the grooves G1 to G4 is 5 to the tread width Tw.
It is in the range of 10%. The tread width Tw is the ground contact width when the rim is assembled to the regular rim and the regular internal pressure and the regular load are applied, as shown in FIG.

As a result, the circumferential center grooves G2 and G3 equalize the rigidity in the vicinity of the tire equatorial plane on the left and right, and prevent uneven wear of the circumferential edge of the groove that occurs when a circumferential groove extending on the tire equatorial plane having a large ground contact pressure is provided. In addition, the straight circumferential groove prevents skidding and enhances drainage to improve wet grip.

Further, as in this example, another pair of circumferential side grooves G1, G4
Also, by arranging them at equal intervals on the outer sides in the tire axial direction of the circumferential center grooves G2 and G3, respectively, it is possible to enhance the left-right uniformity with respect to the tire equator.

The lateral grooves K1 and K2 are the central grooves G2 and G3 in the circumferential direction.
On the other hand, for example, a straight groove extending from the circumferential groove G2 with respect to the tire circumferential direction at angles θ1 and θ2 so as to form a V shape and extending to the tread side end is formed.

Further, the lateral groove K2 extends from one circumferential center groove G2 and crosses the region between the circumferential center grooves G2, G3 on both sides of the tire equatorial plane C in a fixed direction, so that the tread pattern with respect to the tire equatorial plane C. And become asymmetric.

Here, the lateral grooves K1 and K2 have a groove width Gk that is substantially the same as or narrower than the lateral width Gg of the grooves GI to G4, and intersect with the circumferential grooves G1 to G4 so that the parallel four sides are formed therebetween. Form block B.

In this way, the lateral groove K2 also passes through the equatorial portion between the circumferential center grooves, so drainage and water film cutting in the equatorial portion are better and wet grip is better than when the lateral groove is not provided in the equatorial portion. Helps to improve skiing and prevent skidding.

Further, as described above, the block pattern is a parallelogram, the bending rigidity in the radial direction on the tire peripheral surface is reduced, and flexibility is imparted to improve riding comfort.

In this embodiment, the inclination angles θ1 and θ of the lateral grooves K1 and K2 are
2 is preferably set to the same angle in the range of 30 to 60 °, for example. Therefore, the lateral grooves K1 and K2 have a barbed pattern with the same angle of the hypotenuse inclined to the V shape. Where the angles θ1, θ
If 2 is less than 30 °, wet grip performance is poor,
If it exceeds 60 °, high-speed performance will be deteriorated. The left and right inclination angles θ1 and θ2 can be made different, which increases the asymmetry of the tire.

In the present invention, the block unit B has grooves G1, G2,
The wet grip performance is improved by providing G3 with two short slots S extending in the axial direction of the tire, that is, in the lateral direction. The slot S has a width dimension equal to or narrower than the groove width Gk of the lateral grooves K1 and K2. It is also possible to form a so-called cut shape that has substantially no width.

Further, the lateral grooves K1 and K2 communicate with the auxiliary grooves M1 and M2 extending in the circumferential direction of the tire at the buttress portion and the auxiliary grooves M1 and M2.
It is interrupted by M2. As a result, rainwater can be smoothly moved and removed from the lateral grooves K1 and K2 in the direction of the sub-grooves M1 and M2, and wet grip performance can be improved.

FIG. 2 shows another embodiment of the present invention.

In this embodiment, the tread P has two pairs of outer circumferential side grooves G1, G6 and a circumferential inner groove G2 outside the pair of circumferential center grooves G3, G4 adjacent to each other with the tire equatorial plane C interposed therebetween. G
5 is arranged, and the lateral grooves K1 and K2 have a tread pattern in which the lateral grooves K1 and K2 are inclined in a V shape at the same angle θ from the circumferential center groove G3.

The lateral grooves K1 and K2 form parallelogram block units B by intersecting the respective grooves G1 to G6. Since the central groove G3 in the circumferential direction is not on the equatorial plane C of the tire, the tire pattern is asymmetrical as in the case of the embodiment shown in FIG. It is also possible to use eight even circumferential grooves.

[Effect of device]

As described above, the asymmetric tire of the present invention includes the circumferential center grooves that are equally spaced on both sides of the tire equatorial plane so that the tread rigidity is equalized on the left and right sides of the tire equatorial plane.

Further, since it does not extend on the tire equatorial plane where the ground contact pressure is large, uneven wear of the peripheral edge of the groove is reduced, and the linear circumferential central groove and circumferential side groove prevent skidding. It also has good drainage and improves wet grip.

The lateral groove extends in a V shape and passes through the equatorial portion between the circumferential central grooves, and by providing the lateral groove in the equatorial portion, drainage and water film cutting performance in the tire equatorial portion are good, and wet grip performance is enhanced.

The lateral groove cooperates with the circumferential center groove and the circumferential side groove to form the tread portion into a block-shaped pattern, which reduces bending rigidity in the radial direction and imparts flexibility and enhances riding comfort.

Moreover, since the block has a parallelogram shape, it contributes to noise reduction.

Further, since the tread portion has an asymmetrical tread pattern, it is used in consideration of, for example, a difference in the load acting on the left and right sides of the tire equator when turning the vehicle. Such as helping to reduce the price tear that causes
The effect as an asymmetric tire can be sufficiently exhibited, and it can be suitably used particularly for a wide tire.

In the asymmetric tire of the present invention, a pair of left and right asymmetric tires may be manufactured and attached to the left and right wheels of the axle, or the same tire may be used for the left and right wheels depending on the purpose.

[Brief description of drawings]

1 and 2 are plan views showing an embodiment of the tire of the present invention. G1, G2, G3, G4, G5, G6 ... Groove, K1, K
2 ... Lateral groove, P ... Tread part

Claims (2)

[Scope of utility model registration request] 1. A pair of circumferential center grooves extending straight in the tire circumferential direction on both sides of the tire equatorial plane and arranged at equal intervals with the tire equatorial plane, and a tire having the circumferential center groove. A tire circumferential direction having a pair of circumferential side grooves arranged on the outer side in the axial direction and extending linearly in the tire circumferential direction, and forming a V shape from one of the circumferential direction central grooves toward both side ends of the tread. An asymmetric tire having a tread pattern that is asymmetric with respect to the tire equatorial plane by providing a straight lateral groove that is inclined with respect to the direction. 2. The asymmetric tire according to claim 1, wherein the V-shaped lateral grooves are inclined at the same angle with respect to the tire circumferential direction.