Title:
【発明の名称】空気入りタイヤ
Document Type and Number:
Japanese Patent JP3373900
Kind Code:
B2
Abstract:
PURPOSE:To enhance the gripping performance at the time when a vehicle travels on snowy roads and icy roads in a tread part having a block pattern in which blocks rising from the groove bottom faces are arranged, by providing the reinforcing layers having a specified values of rubber thickness and rubber hardness on the front and rear wall faces of the base part of the block. CONSTITUTION:Plural blocks 4 (4A, 4B) forming the block pattern of a tread part 2 and rising from the groove bottom faces 3 are formed of a base part 5 which is made of rubber having the hardness of 40 to 65 degrees JISA and rises from the groove bottom face, and the reinforcing layers 6 covering the front and rear faces of the base part, which are directed in the direction of rotation of a tire, with rubber having the rubber thickness of 0.5 to 3.0mm and the hardness of 80 to 95 degrees JISA. Further, sipings 8 are provided on the upper face of the tread part 5, and the siping length ratio or the length obtained by projecting the sipings 8 per unit area on the tire meridian plane is determined to be 0.05 to 0.20mm/mm<2>. Furthermore, the difference in the angle of the rear wall face 7B of the block 4 to a radial line between the regular state and the quickly braked state on icy roads is formed to be 2 to 3 degrees.
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Inventors:
Kengo Hara
Application Number:
JP21222293A
Publication Date:
February 04, 2003
Filing Date:
August 03, 1993
Export Citation:
Assignee:
Sumitomo Rubber Industries, Ltd.
International Classes:
B60C11/00; B60C1/00; B60C11/11; B60C11/12; (IPC1-7): B60C11/11; B60C1/00; B60C11/00; B60C11/12
Domestic Patent References:
| JP61263807A | ||||
| JP2246808A | ||||
| JP5139121A | ||||
| JP2133205A | ||||
| JP481805U | ||||
| JP63129603U |
Attorney, Agent or Firm:
Tadashi Naemura