Abstract:
To improve straight running stability on an off-road. An off-road pneumatic tire 1, which has on a tread portion 2 at least one block row 10 comprising a plural of blocks 9 arranged in the tire circumferential direction. The block row 10 includes a center block row 10A composed of center blocks 11 arranged on the tire equator C. Each of the center blocks 11 comprises a lateral-long block main portion 11a having a width BW in the tire axial direction larger than the length BL in the tire circumferential direction, and a keel portion 11b prepared integrally on the rear side of the block main portion 11a in the tire rotational direction and projecting with a small width toward the rear side in the tire rotational direction.
Abstract:
A corrugation forming apparatus includes, as forming members, a rack tool assembled to a slide table and a pinion tool which rotates with rotation of a shaft. The apparatus also includes, as a displacement synchronization mechanism, a feed rack integrally assembled to the table and a feed pinion gear in meshing engagement with the feed rack. When a handle is rotated, its rotational force is transmitted to the feed rack via the feed pinion gear, so that the rack tool moves along the axial direction, and the pinion tool rotates in synchronism with the movement of the rack tool. This enables forming of successive recesses and projections on the thin metal plate, while reducing ductile cracks and warpage.
Abstract:
An off-road tire (1) comprises a tread portion (2) provided with blocks (10, 11) forming a sea area (8) therearound. The sea area (8) is provided in the bottom (14) thereof with recesses (13), wherein the recesses (13) are arranged circumferentially of the tire and each extend axially of the tire, and the depth (d) of each of the recesses (13) is gradually increased towards its center (13a), whereby the enveloping power is improved.
Abstract:
A corrugation forming apparatus includes, as forming members, a rack tool assembled to a slide table and a pinion tool which rotates with rotation of a shaft. The apparatus also includes, as a displacement synchronization mechanism, a feed rack integrally assembled to the table and a feed pinion gear in meshing engagement with the feed rack. When a handle is rotated, its rotational force is transmitted to the feed rack via the feed pinion gear, so that the rack tool moves along the axial direction, and the pinion tool rotates in synchronism with the movement of the rack tool. This enables forming of successive recesses and projections on the thin metal plate, while reducing ductile cracks and warpage.
Abstract:
An off-road tire (1) comprises a tread portion (2) provided with blocks (10, 11) forming a sea area (8) therearound. The sea area (8) is provided in the bottom (14) thereof with recesses (13), wherein the recesses (13) are arranged circumferentially of the tire and each extend axially of the tire, and the depth (d) of each of the recesses (13) is gradually increased towards its center (13a), whereby the enveloping power is improved.