| 摘要 |
The tread pattern has profile blocks running axially from the outer to the inner tire shoulders. The axial rows are separated by a first circumferential channel (7) into circumferential block rows (1,2;3,4,5), those on one side of the channel performing a different function to those on the other. Blocks (31,32) in the axial rows running to the outer tire shoulder have a higher transverse shear strength than blocks (33,34,35) running to the inner shoulder on the other side of the channel. Preferred Features: The number of profile blocks (33,34,35) and lamellae (166-21), in both circumferential and transverse directions in the blocks members on the inner side (I) of the circumferential channel (7) is 10-50% higher than on the outer side (A). Additional circumferential channels may further divide the axial block rows on both sides of the first channel, the cross-section of the additional channel (8) on the inner side being greater than that of the channel (6) on the outer side of the first circumferential channel. Lamellae in axial blocks on the inner side of the first circumferential channel are equally spaced from each other, but the distance between the outer lamellae and the profile block edge is 7-15% greater than the lamellae spacing in a block. Lamellae depth in the inner area blocks is 10-20% greater than the lamellae spacing in a block. Lamellae depth in the inner area blocks is 10-20% less at the edge of a block than in the area between the edges. Lamellae are aligned at 80-110 degrees to the longer diagonal between the corners of the trapezium shaped blocks. Blocks (35) in the shoulder block row (5) on the inner side of the tire have lamellae with a sine wave form along their length, the sine wave in adjacent lamellae being phase offset. Phase offset increases with lamellae depth and occurs along two straight lines at different angles to a radial line. The two lines cross each other and form an included angle which is greater, e.g.. 35-60 degrees , in the shoulder block row than in the other rows, e.g.. 15-25 degrees .
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