Pneumatic tire

Abstract

The invention provides a pneumatic tire, which symmetrically improves the on-ice performance and the driving performance of a vehicle. When the pneumatic tire is assembled to a regular rim and filled with a regular inner pressure of a normal state without load, the ratio (TW / SW) of the tread width (TW) between the tread ends (Te) to the maximum width (SW) of a tire is 0.75 to 0.95. The tire surface (14) is equipped with a continuously extending thin groove (15) along the circumferential direction of the tire. The center line (15G) of the groove (15) and the normal (6n) of the carcass are at an angle (alpha) of small than 10 degrees, wherein the normal (6n) of the carcass passes through the extension line (15e) of the center line (15G) and the point of intersection thereof with the carcass (6) is (e1). A pair of shoulder main grooves (8c) continuously extending along the circumferential direction of the tire are arranged on the outer side of the tread end (Te) of the tread portion (2). The depth (D3) of the thin groove (15) is 20% to 50 % of the depth (D2) of the shoulder main grooves (8c).

Description

technical field [0001] The present invention relates to a pneumatic tire which improves performance on ice and driving performance on ruts in a balanced manner. Background technique [0002] Conventionally, a pneumatic tire has been proposed that ensures a large contact area by increasing the tread width and the land ratio. Since such a pneumatic tire can obtain a large frictional force with the road surface, the running performance on an icy road surface can be improved. [0003] However, if Figure 10 As shown in (a), since the above-mentioned pneumatic tire can ensure an appropriate ground contact width w1 when the normal load n1 specified in the specifications is applied, an optimal and large ground contact area can be obtained. However, when the normal load is applied In the case of a smaller load n2, such as Figure 10 As shown in (b), since the contact width w2 is smaller than the contact width w1 described above, a desired contact area cannot be obtained. [0004] ...

AI Technical Summary

Problems solved by technology

[0004] In addition, in a pneumatic tire with an enlarged tread width, the tread end and a part of the wall surface tend to come into contact with the slope of the rut, etc., and the tire is shaken by an external force from the road surface, and it is easy to yaw.

Therefore, although increasing the ground contact area can improve the performance on ice, on the other hand, there is a problem of deteriorating the anti-yaw performance.

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