Load inflation tire

Abstract

The invention discloses a load inflation tire, which can be used to remain the drainage performance and reduce the stones. The load inflation tire is provided with at least a central main groove extending in a tooth-shaped manner on the central area. The central main groove comprises a groove bottom and a pair of groove walls extending from the groove bottom to the tire surface treading surface. Each of the groove walls is provided with groove bottom side steep inclined part and a treading surface side slowly inclined part extending from the external end of the tire of the groove bottom side steep inclined part to the tire surface treading surface, and extends at an angle, which is larger than the groove bottom side steep inclined part. The groove width of the groove bottom side steep inclined part is in a range of from 2 to 8 cm. Each groove wall comprises a concave corner part of the central main groove, and a protruding corner part being bent toward the opposite direction of the central line of the groove. The angle of the treading surface side slowly inclined part is increased gradually from the protruding corner part to the concave corner part.

Description

technical field [0001] The present invention relates to a pneumatic load tire capable of maintaining drainage performance and reducing stone inclusion. Background technique [0002] In order to ensure drainage performance, one or more wide main grooves extending continuously in the tire circumferential direction are provided on the tread portion of the pneumatic tire. For example, when the main ditch is driven at a construction site or the like, a so-called stone trap, in which small stones are caught and kept in a state where the small stones are caught, is likely to occur. Such stone inclusions are particularly likely to occur in heavy-duty pneumatic tires with a large tread pressure and a large groove depth, so there is a problem that rubber chips or cracks occur near the main groove. [0003] As a technique for suppressing such stone inclusions, such as Figure 10 As shown, it is proposed that at the bottom of the main groove 3 and at a position separated from the groov...

AI Technical Summary

Problems solved by technology

[0005] However, the above-mentioned protrusion 35 is easily deformed due to the contraction of the main groove 3 when it is grounded, and thus cannot sufficiently reduce stone inclusions.

In addition, since the protrusion 35 reduces the groove volume of the main groove 3, there is also the problem that the drainage performance is easily reduced.

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