TH85538B - Inflated tires - Google Patents

Abstract

DC60 (01/09/57) The pneumatic tire has high wet grip performance with steering stability and wear resistance. Each section of the tire's center (12) is equipped with grooves. The center groove (15) and the center sub-groove (16) are each curved in shape until the angle (t1) in the circumference gradually increases from its inner end (15i) to its outer end (15o). The circumferential length (L2) is between 0.6 and 1.0 times the provided pitch (P2) of the center groove (15). The center sub-groove (16) connects to the main tread groove (10), ends without connection to the main tread groove (9), and is curved in shape with an angle (t2) that gradually increases from its inner end (16i) to its outer end (16o). The length (L3) of the center sub-groove (16) is less than the length (L2) of the center groove and the adjacent center groove (15) and the center sub-groove (16). Overlapping each other along the axis of the tire.

Claims (6)

OCR 09WP 1. An inflatable tire consists of: the rubber compound, which is arranged with pairs of continuously expanding circumferential main tread grooves, each arranged on opposite sides of the tire's equator; pairs of continuously expanding circumferential main shoulder grooves, each arranged along the outer axis of the main tread grooves on each side of the tire's equator; and pairs of center pits, each arranged between the main tread grooves and the main shoulder grooves on each side of the tire's equator. Each center pit is arranged with multiple central tread grooves, each with an inner end axially connected to the main tread grooves and an outer end axially connected to the main shoulder grooves, and central sub-grooves extending between the central tread grooves adjacent to the circumference without overlapping the central tread grooves; each of the central tread grooves extends in a curved shape in such a way that the angle in the circumference of the tire gradually increases from its inner end to its outer end; The circumference length from the outer to the inner end of the central tread groove is between 0.6 and 1.0 times the allocated pitch of the central tread groove; a central sub-groove with its outer axial end connecting to the main tread groove and its inner axial end terminating without connecting to the main tread groove; a central sub-groove that extends in a curved shape until the angle in the circumference of the tire gradually increases from its inner end to its outer end; the circumference length from the outer to the inner end of the central sub-groove is less than the circumference length of the central tread groove; and the central tread groove and adjacent central sub-grooves overlap each other axially within the tire. 2. The pneumatic tire under Reservion 1, where the central surface of the tire is provided with a central reinforced tread groove between the central tread groove and the central sub-groove adjacent to the circumference; the central reinforced tread groove includes an axial outer end connected to the main groove and an axial inner end that terminates axially towards the inner end of the central sub-groove; and the central reinforced tread groove extends in a curved shape until the angle in the circumference of the tire gradually increases from its inner end to its outer end. 3. Pneumatic rubber tire according to Requisition 1, whereby the ground surface of the tire is provided axially to each of the main grooves of the tire, each of the ground surfaces of the tire is provided with a number of lateral grooves of the tire, each extending axially inward from the edge in contact with the tire compound and consisting of an inner end that terminates without connection to the main grooves of the tire, the ground surface of the tire is provided with a number of first sections of the tire, each of which is separated by lateral grooves of the tire adjacent to the circumference, each of the first sections of the tire is provided with tread grooves of the tire, tread grooves of the tire consisting of an inner end axially connected to the main grooves of the tire and extending in a curved shape at least to the edge in contact with the tire compound, and not less than 70% of the number of lateral sections of the tire consists of at least two tread grooves of the tire. 4. Pneumatic tire pursuant to claim 3, where the radius of curvature of the side groove is less than the radius of curvature of the center groove. 5. Pneumatic tire pursuant to claim 3, where the tread grooves have a greater depth at its outer end than at its inner end. 6. Pneumatic tires pursuant to claim 3, where the radius of curvature of the tread groove is in the range of 30 to 60 mm.