70results about How to "Improve partial wear resistance" patented technology

A pneumatic tire includes a tie bar 9 in a lateral groove 5 disposed in a block array 7. The tie bar 9 connects adjacent blocks 6 in a circumferential direction through the lateral groove 5. The tie bar 9 is formed with a sipeing 11 having a zigzag portion 13. The zigzag portion 13 extends in a zigzag manner in a direction of a groove centerline of the lateral groove 5. The sipeing 11 comprises a three-dimensional sipeing 20 in which a sipeing wall surface 11S is repeatedly recessed and projected three-dimensionally.

The invention provides a pneumatic tire in which the steering stability and uneven wear resistance can be improved while maintaining the drainage performance. The pneumatic tire has a specified installing direction to a vehicle (1). An outboard shoulder main groove (4A) comprises a groove width (W1c) smaller than those of a pair of central longitudinal grooves (3A, 3B) and an inward shoulder longitudinal groove (4B); an outboard middle portion (7A) has a width (W3b) larger than that of an inboard middle portion (7B); inner ends (5Ai) of outboard shoulder cross grooves (5A) and outer ends (5Bo) of outboard central cross grooves (5B) are staggered along the periphery of the tire. Outboard middle thin grooves (13) are arranged on the outboard middle portion (7A) and connect the inner ends (5Ai) of the outboard shoulder cross grooves (5A) and the outer ends (5Bo) of the outboard central cross grooves (5B). The groove width W4 is less than those of the outboard shoulder cross grooves (5A) and the outboard central cross grooves (5B).

A pneumatic tire configured in such a manner that the outer ends of a belt reinforcement layer (12) are located on the outer sides of the outermost grooves (16) in the width direction of the tire, the outermost grooves (16) extending in the circumferential direction of the tire. Buttress portions (19) located on the outer sides of the tread (15) in the width direction of the tire and connecting the surface (15a) of the tread (15) to the sidewalls (20) have outer surfaces which are, in a cross-section of the tire taken in the width direction thereof, recessed so as not to protrude further inward in the width direction of the tire than the outer ends of the surface (15a) of the tread (15) in the width direction of the tire.

The present invention aims to provide a pneumatic tire capable of effectively preventing a large collision noise caused by simultaneous collision of a plurality of blocks of each row with a road surface. The six block rows (9, 10, 13) on the tread contact surface (1) consist of five circumferential grooves (2, 3, 4) extending continuously in a zigzag manner in the circumferential direction of the tread. A plurality of transverse grooves (5, 6, 11) extending in the tread width direction are defined between adjacent circumferential grooves and between the outermost circumferential groove (4) and the corresponding tread side edge (e). The five circumferential grooves (2, 3, 4) include circumferential narrow grooves (2, 4) and a pair of circumferential wide grooves 3, and a pair of circumferential wide grooves (3) are arranged on both sides of the tire equator line and are narrower than the circumferential direction The width of the slots (2, 4) is wide. The transverse grooves (5, 6) are inclined relative to the tread width direction. Each pattern block (7, 8, 12) of the pattern block row (9, 10, 13) has a polygonal plane profile shape with more than six sides, and at the same time, the minimum length of the pattern block in the tread width direction is located at the The length in the tread width direction of the central portion of the block in the tread circumferential direction is longer than the length in the tread width direction of the end portion in the tread circumferential direction. The tread edges (7a, 8a, 12a) of the blocks (7, 8, 12) of each block row (9, 10, 13) are spaced apart from each other in the circumferential direction of the tread when the tire rolls under load.

The invention relates to a fibre reinforced composite anti-eccentric coiled rod and a preparation device thereof. The technical scheme adopted by the invention is as follows: one or more sections of the external surface of a fibre-reinforced resin matrix composite rod body is coated with a thermoplastic wear layer; the rod body is made of one of fibreglass, carbon fibre and basalt fibre; and a resin matrix is one of epoxy resin, urethane resin and vinyl ester resin. A plastic extruder and a cooling device are arranged between a draw gear and a winding device, the plastic extruder is used for coating one thermoplastic wear layer on one or more sections of the surface of a molded sucker rod, and then the cooling device is used for performing cooling treatment, so that the fibre reinforced composite anti-eccentric coiled rod is formed. The invention has the following beneficial effects: the coiled rod has excellent anticorrosion and anti-eccentric performances; the quantity of joints is greatly reduced; the breakage probability and the piston effect are reduced; and in addition, the production efficiency is high, and the operation is simple and convenient.

A pneumatic radial tire for a passenger vehicle has a ratio W / L where W is a cross-sectional width and L is an outer diameter. The tire also has a belt-reinforcing layer having a high rigidity and disposed between a belt and a tread.

A pneumatic tire having enhanced water discharge performance achieved with resistance to uneven wear maintained at a high level. In the pneumatic tire, at least three main grooves extending in the tire's circumferential direction are formed in a tread section, and rows of land sections are formed by the main grooves. Referring to a pair of land sections located on both sides of any one of the main grooves other than the main groove on the outermost side of the tire in the lateral direction thereof, first tilt grooves tilting relative to the tire's circumferential direction are formed in either of the pair of land sections, second tilt grooves tilting in the same direction as the first tilt grooves are formed in the other of the pair, one end of each of the first tilt grooves is opened to the main groove located between the pair of land sections with the other end terminating in said land section of the pair, and one end of each of the second tilt grooves is opened to the main groove located between the pair of land sections with the other end terminating in the other of the pair.

A pneumatic tire having reduced rolling resistance with its high snow traction performance maintained. The pneumatic tire (1) has a tread center region and tread shoulder regions divided by the center lines (I) of circumferential main grooves (22) located on the outermost sides in the lateral direction of the tire. Further, the ratio G = (A + B) / X which is the ratio of the sum (A + B) of the groove area A of circumferential grooves (21, 22) and the groove area B of lateral grooves (3) to the area X of ground contact of the tread is G = 0.25, the ratio S = B / (A + B) which is the ratio of the groove area B of the lateral grooves (3) to the sum (A + B) of the groove area A of the circumferential grooves (21, 22) and the groove area B of the lateral grooves (3) is 0.25 < S < 0.45, and the ratio Gs = C / Y which is the ratio of the groove area C of the tread shoulder regions to the area Y of ground contact of the tread shoulder regions is Gs < 0.20, and the ratio G and the ratio Gs has the relationship of Gs < G.

Provided is a pneumatic tire. In a shoulder block row in which a plurality of shoulder blocks are disposed in a tire circumferential direction, a lateral groove between adjacent shoulder blocks in thetire circumferential direction has a first shallow groove portion that is positioned on a side close to a main groove and has a depth shallower than that of the main groove, a third shallow groove portion that is positioned on a side close to a tire ground contact end and has a depth shallower than that of the main groove, and a second shallow groove portion that is positioned between the first shallow groove portion and the third shallow groove portion, and has a depth shallower than those of the first shallow groove portion and the third shallow groove portion.

A pneumatic tire which includes a tie bar in a lateral groove disposed in a block array, the tie bar connecting adjacent blocks in a circumferential direction through the lateral groove. The tie bar is formed with a sipeing having a zigzag portion, the zigzag portion extending in a zigzag manner in a direction of a groove centerline of the lateral groove. The sipeing is a three-dimensional sipeing in which a sipeing wall surface is repeatedly recessed and projected, three-dimensionally.

A pneumatic tire is provided which makes it possible to achieve both steering stability on dry road surfaces and steering stability on wet road surfaces. This pneumatic tire is provided with a tread portion, a sidewall, and a bead, and has a mounting direction specified with respect to the vehicle, wherein: four main grooves are provided, which include a pair of center main grooves which extend inthe tread portion in the tire circumferential direction and a pair of shoulder main grooves which are outside of the center main grooves and extend in the tire circumferential direction; five land portions are defined by said main grooves, and the center main groove to the outside of the vehicle has a zigzag shape along the tire circumferential direction; multiple lug grooves are provided in theland portions and extend from the main grooves other than the center main groove that has a zigzag shape, towards both sides in the width direction of the tire, and terminate within the respective land portion.

To provide a pneumatic tire with an improved uniformity, in which pitch variation is adopted for suppressing pattern noise. The ratios of groove area in pitches (3a, 3b, 3c) with different pitch lengths are set to be smaller in pitches with longerr pitch lengths. Groove wall angles a on the obtuse angle side that is formed by the groove walls of lateral grooves (2) and the tangential direction of the tread surface are larger in the pitches with longer pitch lengths.

The present invention provides a pneumatic tire in which a narrow groove extending in a tire circumferential direction is formed in a shoulder land portion, and the pneumatic tire is excellent in a groove bottom crack resistance, an irregular wear resistance and a tear resistance. A pneumatic tire comprising a narrow groove (3) extending in a tire circumferential direction, the narrow groove (3) being formed in a shoulder land portion of a tread, wherein an inside concave curved surface (41) and an outside concave curved surface (42) are formed in a groove bottom portion of the narrow groove (3), the inside concave curved surface (41) being obtained by depressing a groove wall in a tread center side and the outside concave curved surface (42) being obtained by depressing a groove wall in atread end side, and the groove bottom portion of the narrow groove (3) is provided as a shape which is wider than an opening portion of the narrow groove (3) and is rounded, and wherein a height (H1)of the inside concave curved surface (41) measured along a depth direction of the narrow groove (3) is greater than a height (H2) of the outside concave curved surface (42).

The purpose of the present invention is to provide a pneumatic tire having improved operational stability performance, anti-noise / vibration performance, and anti-uneven wear performance in a well-balanced manner. In a tire meridional cross-sectional view, a profile line (PL1) of a center land portion (X) defined and formed by two center main grooves (14a, 14b) protrudes outside a reference profile line (PL0) in a tire radius direction. Profile lines (PL2, PL3) of sub-center land portions (Y1, Y2) and shoulder land portions (Z1, Z2) defined and formed in order outside the two center main grooves (14a, 14b) in the tire width direction protrude outside the reference profile line (PL0) in the tire radius direction. A pitch number (Po) of a vehicle-mount outside region and a pitch number (Pi) of a vehicle-mount inside region satisfy the relationship Po < Pi.

Provided is a pneumatic tire including: a belt reinforcing layer (12) having an outside end portion in the tire width direction disposed outside in the tire width direction than a tire circumferential groove (16) disposed at the outermost side in the tire width direction, in which a buttress portion (19) being positioned on the outside of a tread (15) in the tire width direction and connecting a surface (15a) of the tread (15) to a sidewall (20) is formed to have, in section in the tire width direction, an outer surface in a concave shape with a depth shallow enough not to be set into the inside in the tire width direction from the outside end of the surface (15a) of the tread (15) in the tire width direction.

A heavy duty pneumatic tire includes a tread including a pair of central portions, a pair of middle portions and a pair of shoulder portions, wherein each of the portions has an axial width varying periodically while increasing and decreasing in a circumferential direction of the tire. Each of the central portions includes a central block with a hexagonal shaped top face and a central sipe. A total that is the sum of each maximum axial width of the central portions, each maximum axial width of the middle portions, each maximum axial width of the shoulder portions, a maximum axial length of the central sipe provided on one of the central portions, and a maximum axial length of the central sipe provided on the other one of the central portions is in a range of from 1.05 to 1.31 times a tread width.