39results about How to "Increase the edge" patented technology

A pneumatic tire (1) has a shoulder land zone provided with lateral grooves (26) arranged at variable pitches in the tire circumferential direction and extending at an angle of not more than 30 degrees with respect to the tire axial direction. The domains defined between the shoulder lateral grooves include a smallest domain (31S) having the smallest circumferential length and a largest domain (31L, 41L) having the largest circumferential length. The domains are each provided with at least one sipe (32) extending at an angle of not more than 30 degrees with respect to the tire axial direction. The number of the sipe(s) in the smallest domain (31S, 41S) is less than the number of the sipes in the largest domain (31L, 41L).

A pneumatic tire for running on rough terrain is provided in the tread portion with crown blocks, middle blocks and shoulder blocks. Aspect ratios of the crown blocks are less than those of the middle blocks and shoulder blocks. The crown blocks include shifted blocks provided with a slot to form two subdivided block pieces circumferentially shifted from each other. The middle blocks and the shoulder blocks including cut blocks provided with a U-shaped cut opened at the top face and a side face of the block.

The invention discloses an enhancement method of a low-illumination color image. The method comprises the following steps: S1, inputting a low-illumination image; S2, performing color separation on the input image to obtain R, G and B component images; S3, performing homomorphic high-frequency filtering and homomorphic low-frequency filtering on the three component images to respectively obtain high-frequency and low-frequency images of each component; S4, performing linear scaling transformation on the low-frequency image of each component; S5, performing multi-scale Retinex algorithm processing on the high-frequency image of each component; S6, combining the high-frequency image and the low-frequency image after each component is processed; and S7, combining the three component images to obtain an enhanced low-illumination color image. According to the method, the low-illumination color image is enhanced, so that the enhanced image is clearer in detail and higher in contrast ratio, and a better visual effect is achieved.

Provided is a pneumatic tire that has improved travel performance and cut resistance on unpaved roads. According to the present invention, block groups B comprise: a pair of adjacent shoulder blocks 21 that sandwich a shoulder lug groove 31; and a pair of adjacent side blocks 23 that sandwich a side groove 33 that is positioned on a line that extends from the shoulder lug groove 31 that is between the pair of shoulder blocks 21. Contour lines L1 of tire-width-direction outside side surfaces of the shoulder blocks 21 and contour lines L3 of top surfaces of the side blocks 23 extend along the same straight lines. Contour lines L3 that, of the contour lines L3 of the top surfaces of the side blocks 23, are on the side that is away from the side groove 33 that is between the pair of side blocks 23 and contour lines L4 of narrow grooves 42 that are formed in the side blocks 23 are formed from straight portions L3a, L4a that extend along the tire radial direction on the shoulder block 21 side and inclined portions L3b, L4b that extend so as to converge toward the side groove 33 that is between the pair of side blocks 23.

The present invention provides a pneumatic tire for rough terrain, to maintain a grip during cornering and traction performance, and to reduce the rigid feeling of improved light manipulation. A pneumatic tire for rough terrain comprises a tread portion (2) provided with a plurality of blocks (11), the blocks (11)comprising a plurality of center blocks (12), a plurality of shoulder blocks (13) and a plurality of middle blocks (14), each of the center blocks, middle blocks and shoulder blocks comprising a top face (15) and a sidewall face (16), wherein at least one of the middle blocks(14) and shoulder blocks (13) is a U-shaped block (18) having a lateral slot (17) which extends from an axially outer sidewall face of the block to an axially inner end thereof being terminated within the block.

Provided is a pneumatic tire that is advantageous as an off-road tire, the tire having improved driving performance, wear resistance, and cut resistance on off-road surfaces. The pneumatic tire comprises a block pattern having a point-symmetrical structure. Narrow-width outer blocks (21a) and wide-width outer blocks (21b), outer ends of which have different positions with respect to the tire widthwise direction, are alternately disposed around the tire circumferential direction. From among side blocks (23) provided in a side region, large blocks (23a) having large projection areas are disposedto the outside of the narrow-width outer blocks (21a) with respect to the tire widthwise direction, and small blocks (23b) having small projection areas are disposed to the outside of the wide-widthoutside blocks (21b) with respect to the tire widthwise direction. Lateral grooves (12) and side grooves (13) are connected, with the widths of the side grooves (13) communicating with wide-width sections (12a), constituted by the lateral grooves (12) having wide widths at the positions of the outer blocks (21), decreasing inward in the tire radial direction, and the widths of side parts communicating with narrow-width sections (12b), constituted by the lateral grooves (12) having narrow widths at the positions of the outer blocks (21), increasing inward in the tire radial direction, yieldinga tapered shape such that the side blocks (23) decrease in block width toward the wide-width sections (12a) as distance inward in the tire radial direction increases.

Provided is a pneumatic tire that is suitable as a tire for traveling on an unpaved road and that allows improvement of traveling performance and cut resistance on the unpaved road. A pair of side blocks 21, which extend in the tire width direction and face each other with a side groove 22 interposed therebetween, are provided in side regions located on the outer sides in the tire width directionof shoulder regions of a tread portion 1. Repetition elements 20 each comprising the side groove 22 and the pair of side blocks 21 are arranged at an interval in the tire circumferential direction. Atread of each of the side blocks 21 is formed into a protrusion and recess shape that comprises a reference surface 21a located on the side groove 22 side and a step portion 21b which is located on the side opposite to the side groove 22 side and protrudes from the reference surface 21a. A bottom raising portion 22a, which protrudes from the groove bottom and couples the pair of side blocks 21, isprovided in the side groove 22.

A pneumatic tire according to the invention is capable of suppressing a decrease in drainage performance and snow-covered road performance and improving icy road performance. The pneumatic tire is provided with a pair of center pattern blocks (5) divided by center main grooves (3A, 3A) and a plurality of center lateral grooves (4A, 4A) on a tread portion (2) with intervals. The center pattern blocks (5) includes: end edges on two sides of the center pattern blocks (5) in the circumferential direction of the tire, that is a pair of lateral pattern block edges (8, 8), and end edges on two sides of the center pattern blocks (5) in the axial direction of the tire, that is a pair of vertical pattern block edges (9, 9). The lateral pattern block edges (8, 8) respectively has lateral projections (10, 10) protruding outwardly in the circumferential direction of the tire, the vertical pattern block edges (9, 9) respectively has vertical projections (11, 11) protruding outwardly in the axial direction of the tire, and a ratio (Lb / La) of the maximum length (Lb) of the center pattern blocks (5) in the circumferential direction of the tire and the maximum length (La) of the center pattern blocks (5) in the axial direction of the tire is 0.80 to 1.00.

Provided is a pneumatic tire capable of improving the protective effect and decorative effect of buttress areas. The pneumatic tire is provided with a plurality of lug grooves (8) extending from the shoulder area (3S) of the tread portion (3) toward the outside in the tire width direction and reaching the buttress area (2B) of the sidewall portion (2). ; and pattern blocks, which are divided by a plurality of horizontal grooves (8). The pattern blocks divided by a plurality of horizontal grooves (8) include: the shoulder block (31) arranged in the shoulder area (3S), and the buttress block (31) arranged in the buttress area (2B) twenty one). The buttress region (2B) is provided with an annular rib (22) that cuts across the buttress block (21) and extends annularly along the tire circumferential direction. At least some of the lug grooves (8A) among the plurality of lug grooves (8) are provided with widened portions (23) to increase the width of the annular rib (22).

The present invention provides a pneumatic tire in which snow performance is improved while the occurrence of pattern noise is suppressed. A center land part (10A), intermediate land parts (10B), andshoulder land parts (10C) are each provided with a plurality of sipes (11, 12, 13) arranged at intervals in the circumferential direction of the tire. The sipes (11) each have, at one end thereof, a large-width section (14), which is formed to have a large groove width. The sipes (13) extend from outside a grounding end (E), in the width direction of the tire, toward outer main grooves (9B). The directions in which the sipes (11, 13) extend, with respect to the circumferential direction of the tire, are opposite to the direction in which the sipes (12) extend. The inclination angle theta CE ofthe sipes (11), the inclination angle theta MD of the sipes (12), and the inclination angle theta SH of the sipes (13) satisfy the relationship theta CE < theta MD < theta SH <90 degrees. Ends (12a)of the sipes (12) adjacent to inner main grooves (9A) are located between ends (11a) of the sipes (11). At least the sipes (11) or the sipes (12) are located on the meridian of the tire at any position on the entire circumference of the tire.

Provided is a pneumatic tire that is suitable for use as a tire for traveling on unpaved roads and that improves traveling performance on unpaved roads. Center blocks 10, which are provided in a center region of a tread section 1, are arrayed so as to form a pair of center blocks 10 between which there are interposed inclined grooves 30 that extend in an inclined direction with respect to a tire circumferential direction. The center blocks 10 are made to extend so as to straddle a tire equator CL from one side to the other side of the tire equator CL. Notches 11, which are each composed of a first wall 11a and a second wall 11b connected to each other in a V shape, are provided in treads in each center block CL. The first walls 11a are made to extend at an angle within + / -20 degrees with respect to the tire circumferential direction. The second walls 11b are made to extend at an angle of + / -10 degrees with respect to a tire width direction. Inclined grooves 20 are each constituted by asee-through portion 21 and an expanded portion 22 having a larger groove width than the see-through portion 21. A width SW of a see-through region S that can extend without intersecting an extensionline of the see-through portion 21 is made to be equal to or greater than 30% of a tread width TW.