66results about How to "Improve partial wear resistance" patented technology

The invention relates to a multilayer compound eccentric-wear-preventing continuous sucker rod and a manufacturing device and a manufacturing method thereof. The sucker rod is characterized in that one section or several sections of the external surface of a fiber reinforced resin matrix composite rod body are respectively covered with a thermosetting wear layer; each thermosetting wear layer is made from one of polyurethane, a fluorocarbon coating, modified epoxide resin, vinylester resin, unsaturated polyester and phenolic resin; by adopting a manufacturing technology of multilayer composite winding and pultrusion or weaving and pultrusion, an internal layer of longitudinal fibers, an intertwining layer or a weaving layer and an external layer of longitudinal fibers are formed from interior to exterior in sequence; the manufactured rod body has a continuous length of 0-5000m. The sucker rod has the beneficial effects that the radial strength and the axial compressive strength are enhanced; the corrosion resistance and the eccentric wear resistance of the thermosetting wear layers are improved by 30%; the maximum temperature tolerance of the thermosetting wear layers is up to 190 DEG C; meanwhile, the bonding between an sucker rod body and each thermosetting wear layer is greater in length and quite high in strength, so that the slippage and the layering of an eccentric-wear-preventing layer from the surface of the sucker rod in the normal operation of an oil well are avoided.

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 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.

A pneumatic tire has a tread pattern designed to provide improved heat dissipation properties, wear resistance, and uneven wear resistance. The tire has arranged in a tread (2) two circumferential fine grooves (10) disposed on opposite sides of the equatorial surface (CL) of the tire and extending in the circumferential direction of the tire, and the circumferential fine grooves (10) define a center land section (11). In the center land section (11) are formed oblique fine grooves (12) each having a first small groove (13) extending in the tire's circumferential direction, a second small groove (14) extending obliquely relative to the circumferential direction from one end of the first small groove (13) toward one circumferential fine groove, and a third small groove (15) extending obliquely relative to the circumferential direction from the other end of the first small groove (13) toward the other circumferential fine groove.

The invention relates to a pneumatic tyre, which has the characteristics of drainage decrease prevention, operating stability improvement, noise performance and good anti-wearing performances. The tread contour of the pneumatic tyre in the invention comprises an inner side part and an outer side part. The inner side part comprises an inner side tyre surface reference face formed by circular arcs with a radius of curvature and an inner side chamfered circular arc face formed by circular arcs with a smaller radius of curvature. The outer side part comprises an outer side tyre surface reference face formed by circular arcs with a radius of curvature and an outer side chamfered circular arc face formed by circular arcs with a smaller radius of curvature. The outer side chamfered depth is larger than the inner side chamfered depth. The outer side chamfered depth is a normal-direction distance between an outer side imagined circular arc extending from outer side tyre surface reference face towards the axial inner side and the outer side chamfered circular arc face. The inner side chamfered depth is a normal-direction distance between an inner side imagined circular arc extending from the inner side tyre surface reference face towards the axial outer side and the inner side chamfered circular arc face.

The invention provides a heavy duty pneumatic tire with low oil consumption and excellent uneven wear resistance. The tire has a belt and a tread such that ratio of width of the belt to width of the tread is greater than or equal to 0.95 and is not greater than 1.0. The tread has shoulder land portions on outer sides in axial direction, each shoulder portion has a cap layer including a body portion and a pad, the pad has complex elastic modulus greater than complex elastic modulus of the body portion, the body portion has loss tangent less than loss tangent of the pad, and each shoulder portion has ground-contact surface which has outer and inner ground-contact surfaces separated by boundary between the body portion and pad such that ratio of average ground-contact pressure of the outer ground-contact surface relative to average ground-contact pressure of the inner ground contact surface is greater than or equal to 0.85 and is not greater than 0.95.

Provided is a rubber composition for heavy load pneumatic tires, the rubber composition being configured so as to improve low rolling resistance, wear resistance and uneven wear resistance above prior levels. The rubber composition is characterized in that: 35-50 parts by weight of silica, 1.5-3.5 parts by weight of sulfur, and carbon black, sulfenamide vulcanization accelerator and sulfur-containing silane coupling agent are blended with respect to 100 parts by weight of a diene rubber containing 80-100 weight% of natural rubber; the total of the sulfur and the sulfur in the sulfur-containing silane coupling agent is 1.85-6.0 parts by weight; and the amount of the sulfenamide vulcanization accelerator blended is (A) parts by weight, which is determined from a specific formula (1), to 2.6 parts by weight.

The invention relates to a flat pneumatic radial tire for heavy loads having a 0-degree belt composed of steel cords, and the durability of the tire is improved. The pneumatic radial tire is equipped with a multi-layer steel cord belt layer (6) on the outer periphery of the carcass layer (4), wherein the steel cord belt layer (6) is composed of at least one 0 degree belt layer (7) and at least two inclined belt layers (8), the cord angle of the 0 degree belt layer relative to the tire circumferential direction is substantially 0 degree, and the cord angle of the inclined belt layer relative to the tire circumferential direction It is a substantially balanced angle in the range of 45 to 65 degrees. A tire vulcanized and molded in a metal mold is released from the mold, assembled to a rim at a high temperature, inflated, and cooled to normal temperature in the inflated state to produce the tire.

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.

The invention provides a pneunatic tyre which prevents water discharging performance and improves uneven wear resistance and noise performance. The tire tread is provided with a central main groove in an equatorial plane of the tire, a pair of central auxiliary grooves at two sides of the central main groove, and a pair of tire shoulder main grooves at two sides, thereby forming central landing parts, middle landing parts and tire shoulder landing parts. Each middle landing part is provided with middle transverse grooves which are separately arranged in a circumferential direction and respectively extend from the central auxiliary groove to the tire shoulder main groove in an angle beta in 10-20 DEG. Each middle transverse groove is composed of a large-width part which is connected with the central auxiliary groove, a small-width part which is connected with the tire shoulder main groove, and a transition part which connects the large-width part with the small-width part. The angle beta of the middle transverse groove is larger than the angle alpha of the grounding front edge part of the middle landing part in the shape of a grounding surface.

The invention provides a pneumatic tire capable of improving snow performance. A tread (Tr) is provided with a plurality of main grooves (1) continuously extending in the tire circumferential direction, and a plurality of land rows (2) divided by the plurality of main grooves (1). The land row (2) is provided with a snow hole (3) formed in the center of the land row (2) in the width direction, andsipes (4) for connecting the main groove (1), the ground contact end (CE) or the lateral groove to the snow hole (3). Therefore, the shearing force of the snow column during the driving on the ice and snow covered road surface can be improved, the occurrence of snow inclusion can be inhibited, and the snow performance is improved.