Pneumatic tire
A pneumatic tire comprising circumferential main grooves, a land portion defined by the circumferential main grooves, and a plurality of lug grooves disposed in the land portion that open to the circumferential main grooves. The land portion comprises notch portions formed on opening portions of the lug grooves and chamfered portions formed on edge portions of the notch portions. The notch portions have an edge portion with a V-shape projecting in a tire circumferential direction. A maximum width W 2 of the notch portions and a width W 3 of the chamfered portions have the relationship 0.30≤W 3 /W 2 ≤1.80.
1. A pneumatic tire, comprising:
a plurality of circumferential main grooves;
a land portion defined by a pair of the plurality of circumferential main grooves; and
a plurality of lug grooves disposed in the land portion that open to at least one of the plurality of circumferential main grooves;
the land portion comprising notch portions formed only on opening portions of the lug grooves, and chamfered portions formed on edge portions of the notch portions, the notch portions comprising an edge portion with a V-shape projecting in a tire circumferential direction; and
a maximum width W 1 of the land portion and a maximum width W 2 of the notch portions having a relationship 0.05≤W 2 /W 1 ≤0.25.
2. The pneumatic tire according to claim 1 , wherein the maximum width W 2 of the notch portions and a width W 3 of the chamfered portions have a relationship 0.30≤W 3 /W 2 ≤1.80.
3. The pneumatic tire according to claim 1 , wherein a width W 3 of the chamfered portions is in a range 1.5 mm≤W 3 ≤6.0 mm.
4. The pneumatic tire according to claim 1 , wherein a maximum groove depth D 1 of the lug grooves and a maximum depth D 2 of the notch portions have a relationship 0.30≤D 2 /D 1 ≤1.00.
5. The pneumatic tire according to claim 4 , wherein the lug grooves include wider lug grooves and narrower lug grooves, and wherein the maximum groove depth D 1 of the narrower lug grooves and the maximum depth D 2 of the notch portions have the relationship D 2 /D 1 ≤0.80.
6. The pneumatic tire according to claim 1 , wherein a circumferential length L 1 of edge portions of the land portion defined by the lug grooves adjacent to one another and a circumferential length L 2 of the notch portions formed on the edge portions have a relationship 0.30≤L 2 /L 1 ≤0.80.
7. The pneumatic tire according to claim 1 , wherein a bend angle θ of the V-shape of the notch portions is in a range 10 degrees≤θ≤70 degrees.
8. The pneumatic tire according to claim 1 , wherein the notch portions are disposed intersecting the opening portions of the lug grooves.
9. The pneumatic tire according to claim 1 , wherein
the land portion is a first land portion and land portions on an other side of the circumferential main grooves from the first land portion are second land portions, and
the second land portions each comprise a pair of lug grooves that incline at different inclination angles, and extension lines of groove center lines of the pair of lug grooves meet at the edge portion of the first land portions, and
the notch portions of the first land portion are formed surrounding the extension lines of the groove center lines of the pair of lug grooves.
10. The pneumatic tire according to claim 1 , wherein the land portion comprises a three-dimensional sipe that pass completely through the chamfered portion and opens to the circumferential main groove.
11. The pneumatic tire according to claim 10 , wherein an opening portion of the three-dimensional sipe to the circumferential main groove and the notch portions are disposed spaced apart from one another in a tire circumferential direction at the edge portion of the land portion.
12. The pneumatic tire according to claim 10 , wherein
the land portion comprises a three-dimensional sipe that terminates within the land portion at one end portion and opens to the edge portion of the land portion at an other end portion, and
a terminating end portion of the three-dimensional sipe and the chamfered portion are disposed spaced apart from one another.
13. A pneumatic tire, comprising:
a plurality of circumferential main grooves continuously extending in a tire circumferential direction;
a first land portion defined by a pair of the plurality of circumferential main grooves;
a plurality of lug grooves disposed in the first land portion that open to at least one of the plurality of circumferential main grooves; and
second land portions on an other side of the circumferential main grooves from the first land portion; wherein
the first land portion comprising notch portions formed only on opening portions of the lug grooves, and chamfered portions formed on edge portions of the notch portions;
the second land portions each comprise a pair of lug grooves that incline at different inclination angles, and extension lines of groove center lines of the pair of lug grooves meet at the edge portion of the first land portions;
the notch portions of the first land portion are formed surrounding the extension lines of the groove center lines of the pair of lug grooves; and
a maximum width W 1 of the land portion and the maximum width W 2 of the notch portions have a relationship 0.05≤W 2 /W 1 ≤0.25.
14. A pneumatic tire, comprising:
a plurality of circumferential main grooves;
a land portion defined by a pair of the plurality of circumferential main grooves; and
a plurality of lug grooves disposed in the land portion that open to at least one of the plurality of circumferential main grooves; wherein
the land portion comprises notch portions formed only on opening portions of the lug grooves, and chamfered portions formed on edge portions of the notch portions;
the lug grooves include wider lug grooves and narrower lug grooves alternately disposed in a tire circumferential direction;
the narrower lug grooves have the notch portions and the chamfered portions;
the wider lug grooves do not have the notch portions and the chamfered portions; and
a maximum width W 1 of the land portion and the maximum width W 2 of the notch portions have a relationship 0.05≤W 2 /W 1 ≤0.25.