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 that can balance the performance on ice and the rutting performance. Background technique [0002] In the past, there have been proposed pneumatic tires that ensure a larger ground contact area by increasing the tread width and land ratio. Since such a pneumatic tire can obtain a large frictional force with the road surface, it can improve the running performance on icy roads. [0003] However, as Picture 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 accordance with the specifications is applied, it can obtain the best and larger ground contact area, but when the load is less than the normal load In the case of a smaller load n2, such as Picture 10 As shown in (b), since the ground contact width w2 is smaller than the ground contact width w1, the desired ground contact area cannot be obtained. [0004] In addi...

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Problems solved by technology

[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 above contact width w1, the desired contact area cannot be obtained.

[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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