发明名称 PNEUMATIC RADIAL TIER FOR HEAVY LOAD
摘要 PURPOSE:To facilitate removal of stones bitten into a groove for making it possible to prevent a belt end from cracking by positioning bending points in a lug groove within a specified % of the tire width from the tread end, and still separating respective bending positions of the groove from each other over a specified distance in width direction and making width of the part of the groove outside the position of the bending point over a specified % of width of the part of the groove inside the same position. CONSTITUTION:By setting a distance (k), in the width direction of a tire, from the tread end of a point positioned in the middle of distance (1) in tire width direction between respective bending point (b), (c) on groove walls 4a, 4b of a lug groove, in a range of 15-25% of a tread width TW transmission of external force to side end edge (f) is largely reduced when the groove bits stones. Moreover mutually separated distance in the tierwidth direction of respective bending points (b), (c) on the groove wall 4a, 4b is made to be in 6-15mm, and width (d) of the part of the groove positioned outerward in the tire width direction from a bending point (a) in the lug groove 4 is made 150-170% of width (e) of the part of the groove positioned inward from the same bending point (a). Possibility of stones bitten in the lug groove 4 to naturally fall off is raised accordingly, and a fear of the groove bottom of the lug groove cut by the stones in broadly reduced.
申请公布号 JPH02127104(A) 申请公布日期 1990.05.15
申请号 JP19880280389 申请日期 1988.11.08
申请人 BRIDGESTONE CORP 发明人 FUNATO NAOMICHI
分类号 B60C9/18;B60C11/04;B60C11/11;B60C11/117;B60C11/13 主分类号 B60C9/18
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