A tire includes, in a tread portion, a pair of shoulder main grooves, a crown region between the shoulder main grooves, and shoulder regions disposed outside of the shoulder main grooves in a tire axial direction. Land ratios of the crown region and the shoulder regions are respectively 40%-60%. In the crown region, a plurality of middle blocks are arranged on both sides of a tire equator, and each middle block has a longitudinal shape in which a length in the tire circumferential direction is larger than a length in the tire axial direction.

A pneumatic tire can suppress uneven wear of the tire and can improve traction performance on snow. Land portions (12A, 12B, 12C), between a pair of outermost side circumferential grooves (11d, 11d) on the outermost sides in the tire widthwise direction among a plurality of circumferential grooves (11a, 11b, 11c, 11d) extending in the tire circumferential direction, are divided into a plurality of blocks (14A, 14B, 14C) by widthwise grooves (13a, 13b, 13c). A pair of groove side faces (13ap, 13aq; 13bp, 13bq; 13cp, 13cq) opposed to each other in the widthwise grooves (13a, 13b, 13c) are bent at bent portions (Kp, Kq) thereof.

The tire includes a tread section (10) including a pair of circumferential main grooves (20), and the tread section (10) includes a center land region (CR) partitioned by the pair of circumferential main grooves (20) and a shoulder land region (SR) partitioned by one circumferential main groove (20) and a tread end (TE). The center land region (CR) forms a dense structure, in which no main groove extending along the tire circumferential direction (TC) is formed. The shoulder land region (SR) includes a block (40) partitioned by a plurality of shoulder lateral grooves (30) crossing in the tire width direction (TW). A sipe (50) extending in the tire width direction (TW) and having one end communicating with the one circumferential main groove (20) is formed in the block (40). A projection (43) projecting inward in the tire width direction is formed on a first groove wall (21) of the circumferential main groove (20) in a corner part (41) of the block (40) formed by intersection of the one circumferential main groove (20) and the shoulder lateral groove (30).

A walking mechanism for driving a machine body includes a walking wheel group having a plurality of walking wheels attached to the machine body, with two front and two rear wheels relative to a traveling direction. The machine body has two sides with a pair of one of the front wheels and a one of the rear wheels being respectively located on each of the sides and driven to rotate synchronously. Each walking wheel includes an auto tire casing with a tread outer side having a tread pattern distributed along a circumferential direction of the auto tire casing. The tread pattern is configured as a plurality of tread ribs with a respective tread groove formed between each adjacent pair of the tread ribs, the tread pattern radiating outward from an axial center of the walking wheel. A related robot and self-walking mower are also disclosed.

A pneumatic tire includes a plurality of main grooves and a land portion defined by the main grooves. Further, the main groove includes a rib-shaped protrusion portion protruding from a groove bottom of the main groove and extending in a tire width direction, and being coupled to a groove wall of the main groove at, at least, one end. Further, a maximum height H1 of the protrusion portion has a relationship 0.01≤H1/Hg≤0.20 with respect to a groove depth Hg of the main groove. Further, the maximum height H1 of the protrusion portion is in a range H1≤1.6 mm.

Tyre (1) for heavy load vehicle wheels, having a tread band (8) comprising: —a plurality of circumferential grooves (3, 4, 5, 6); —a plurality of transverse grooves (15) extending between two axially consecutive circumferential grooves (3, 4, 5, 6), thus defining a plurality of blocks (21); —each block (21) comprising a radially outer top surface (7) and having a height (M) measured between said top surface and a bottom surface of a respective transverse groove (15); —said transverse grooves (15) comprising a first segment (16) having a width L1 and a second segment (17) having a width L2, where L2<L1; —said first segment (16) being at least partially delimited by walls of two circumferentially consecutive blocks (20, 21); —at least one filling element (18) contained within said first segment (16); —said at least one filling element (18) having a radially outer top surface (19), located radially inwardly relative to said top surface (7) of the block at a radial distance (D) between 5% and 50% of the height (M) of the blocks (21); —the plan surface area (A2) of said top surface (19) of said at least one filling element (18) being greater than 60% of the plan surface area (Ai) of said first segment (16); —said at least one filling element (18) being spaced apart from said walls (27, 28) along at least 70% of its perimeter (P).

A tire includes a tread portion provided with at least one circumferentially extending zigzag main groove having a groove bottom, the at least one main groove including first inclined portions, second inclined portions each inclined in an opposite direction to the first direction, and first intersections where the first inclined portions and the second inclined portions are communicated with each other. The first inclined portions and the second inclined portions are arranged alternately in the tire circumferential direction. The first inclined portions are longer than the second inclined portions. The groove bottom of the at least one main groove is provided with at least one protruding part extending in a width direction of the at least one main groove, and a distance between the at least one protruding part and one adjacent first intersection is equal to or less than 2 times groove widths of the first intersections.

A pneumatic tire can suppress uneven wear of the tire and improve the performance on snow. A plurality of inner side circumferential grooves (11a, 11b, 11c) arrayed between a pair of outermost side circumferential grooves (11d, 11d) have a groove width that is smaller than that of the outermost side circumferential grooves (11d) to such a degree allowing land portions on the opposite sides thereof to come into contact with each other upon grounding. A plurality of recessed portions (S) of a shape cut in a radial direction from a tread face are formed along the tire circumferential direction on opposing block wall faces (14Af, 14Bf) of blocks (14A, 14B) on the opposite sides of at least one (11b) of the inner side circumferential grooves.

A tire includes a tread portion 2. At least one middle lateral groove 10 includes first and second middle tie bars 16 and 17. First and second middle sipes 21 and 22 are provided on a ground-contact surface 15s of at least one middle block 15. The first middle sipe 21 includes a termination end 21a located on an inner side in a tire axial direction with respect to the first middle tie bar 16. The second middle sipe 22 includes a termination end 22a located on an outer side in the tire axial direction with respect to the second middle tie bar 17 and on the inner side in the tire axial direction with respect to the termination end 21a of the first middle sipe 21. On the ground-contact surface 15s of the middle block 15, no groove and no sipe are provided in a first region 23.

Disclosed is a pneumatic tire including: in a tread surface of a tread portion, a pair of main grooves (center main groove and shoulder main groove) arranged side by side in a tire lateral direction and extending in a tire circumferential direction; land portions (middle land portion) defined by the main grooves; a plurality of lug grooves arranged side by side in the tire circumferential direction and bent and folded back, each of the lug grooves including one end communicating with the shoulder main groove, the other end terminating within the middle land portion, and a bending point in a middle of a path from one end to the other end; and sipes extending across the lug grooves, at least one side of the sipe with respect to the lug groove being formed in a zigzag shape.