135results about How to "Increase contact stress" patented technology

This invention relates to a method of forming a polymer component and comprises blending polymer particles with antioxidant to form a mixture in which the antioxidant coats the polymer particles, irradiating the mixture to cross-link the polymer particles therein and forming the irradiated mixture into a consolidated component. The invention also relates to a method of forming an articular surface for a prosthesis and a prosthesis having a polymer articular bearing surface wherein at least one pre-determined portion of the bearing surface is provided with cross-linked polymer bonds.

A modular hip prosthesis, comprising: (a) a proximal segment including a neck lockingly engageable with a femoral head component and a male tapered portion; (b) a distal segment having a proximal end and a distal tip, the distal segment further formed with a male tapered portion adjacent the proximal end thereof; and (c) a metaphyseal segment having a proximal end and a distal end, the metaphyseal segment preferably including a bone engaging outer surface portion, and further including an axial bore therethrough, the axial bore including first and second female tapered portions formed adjacent the proximal and distal ends thereof, respectively. The first female tapered portion of the metaphyseal segment is dimensionally configured to lockingly engage the male tapered portion of the proximal segment. The second female tapered portion of the metaphyseal segment is dimensionally configured to lockingly engage the male tapered portion of the distal segment. Optionally, a screw dimensionally configured to pass through aligned bores in the proximal, metaphyseal and distal segments is threadably engaged with a threaded bore formed in the proximal end of the distal segment.

A modular hip prosthesis, comprising: (a) a proximal segment including a neck lockingly engageable with a femoral head component and a male tapered portion; (b) a distal segment having a proximal end and a distal tip, the distal segment further formed with a male tapered portion adjacent the proximal end thereof; and (c) a metaphyseal segment having a proximal end and a distal end, the metaphyseal segment preferably including a bone engaging outer surface portion, and further including an axial bore therethrough, the axial bore including first and second female tapered portions formed adjacent the proximal and distal ends thereof, respectively. The first female tapered portion of the metaphyseal segment is dimensionally configured to lockingly engage the male tapered portion of the proximal segment. The second female tapered portion of the metaphyseal segment is dimensionally configured to lockingly engage the male tapered portion of the distal segment. Optionally, a screw dimensionally configured to pass through aligned bores in the proximal, metaphyseal and distal segments is threadably engaged with a threaded bore formed in the proximal end of the distal segment.

A method of forming a wellbore casing within a borehole that traverses a subterranean formation includes the steps of assembling a tubular liner by coupling a threaded portion of a first tubular member to a threaded portion of a second tubular member and coupling a tubular sleeve to the threaded portions of the first and second tubular members. The method further includes positioning the wellbore casing within the borehole and radially expanding and plastically deforming the wellbore casing assembly within the borehole. The step of coupling the tubular sleeve through the threaded portions of the and second tubular members includes applying impulsive magnetic energy to the tubular sleeve.

A seal segment is provided for a shroud ring of a rotor of a gas turbine engine. The seal segment is positioned, in use, radially adjacent the rotor. The seal segment has two or more spaced passageways. In use, a respective support bar can be contained within each passageway. The support bars allow attachment of the seal segment to the engine casing. Each passageway has an elliptical or substantially elliptical cross-section with a minor diameter and a major diameter, the minor diameter being substantially aligned with the radial direction. The respective support bar has a correspondingly elliptical or substantially elliptical cross-section for a close fit in the passageway.

The invention relates to a high-frequency torsion and axial bidirectional impactor, and belongs to the technical field of oil and gas field well drilling and well repairing tools. The high-frequency torsion and axial bidirectional impactor comprises a housing, a connector, an alignment bearing, a turbine shaft, an upper hammer body and a lower hammer body, wherein the connector is mounted at one end of the housing in a threaded manner; the lower hammer body is glidingly mounted at the other end of the housing through an end cover and a buffer spring, and the turbine shaft is mounted in the housing through a nut; a turbine rotor and a stator are mounted at one end of the turbine shaft, and the upper hammer body is mounted at the other end of the turbine shaft. By adopting the high-frequency torsion and axial bidirectional impactor, contact stress between a drill bit and rock can be effectively increased, and crack expansion in a broken pit can be effectively improved, so that the rock breaking efficiency of the drill bit can be improved; the problems that when a conventional rotating well drilling mode is adopted, the well drilling efficiency is degraded, the service life of the drill bit is shortened, the well drilling period is long and the cost is high when a hard stratum is encountered can be solved; the high-frequency torsion and axial bidirectional impactor has active popularization meanings in well-drilling efficiency improvement and well drilling cost reduction.

A power connector assembly with improved terminals includes a first electrical connector and a second electrical connector. The first electrical connector has a first insulated body and a plurality of first power-terminal sets received in the first insulated body. The second electrical connector has a second insulated body and a plurality of second power-terminal sets received in the second insulated body. Each of the first power-terminal sets is contacted with each of the second power-terminal sets correspondingly. Each second power-terminal set has a pair of separate second power terminals. Each second power terminal has a contacting portion for contacting with the first power-terminal set. Each contacting portion is protruded with at least one bulge portion toward the first power-terminal set from a side thereof.

Milling strategies for machining dental ceramic materials are provided that reduce milling time while maintaining strength, accuracy and marginal integrity.

The invention discloses a sectionalized flexible roll convexity regulation and control roller. The sectionalized flexible roll convexity regulation and control roller is mainly characterized in that an axial center through hole is formed in a roll core, one or a plurality of parallel ring-shaped electromagnetic rods are arranged on the roll core, axial through holes are regularly formed in the ring-shaped electromagnetic rods to be similar to 'honeycombs' in the appearance, a bundle of wires penetrates each axial through hole, two ends of each bundle of wires are individually connected with power sources by slide rings, signals can be independently fed by each bundle of wires, a groove is formed in the inner peripheral surface of each electromagnetic rod, a temperature sensor is arranged in each groove, an insulating support ring is arranged between every two corresponding electromagnetic rods, grooves are formed in two end surfaces of each insulating support ring, two shaft sleeve endcovers are arranged on the outer sides of the electromagnetic rods at two ends of the roll core, one of the shaft sleeve end covers is positioned by shaft shoulders, the other shaft sleeve end coveris connected onto the roll core in a threaded manner, grooves are formed in the end surfaces, which are adjacent to the corresponding electromagnetic rods, of the two shaft sleeve end covers, cylindrical roll sleeves are arranged on the outer peripheral surfaces of the electromagnetic rods, the insulating support rings and the shaft sleeve end covers, and a slide ring is arranged on the top of theend, which is provided with a boss, of the roll core. The sectionalized flexible roll convexity regulation and control roller has the advantages of high plate shape regulation and control ability, roller stiffness and regulation and control speed.

A threaded connection including a pin member and a box member, and methods for manufacturing and forming said threaded connection. The pin member has a pin thread with a pin thread crest, a pin thread root, a pin load flank, and a pin stab flank. The box member has a box thread with a box thread crest, a box thread root, a box load flank, and a box stab flank. At least one of the pin thread crest, the pin load flank, the pin stab flank, the box thread crest, the box load flank, and the box stab flank has at least one perturbation formed thereon. Upon a selected make-up of the pin member with the box member, an increased contact stress exists between the pin thread and the box thread at the at least one perturbation.

The invention relates to an underground packer with a double-compression function and a use method of the packer. According to a double-acting compression type packer, a center pipe of the packer is sleeved with an outer pipe, an outer step at the upper end of the center pipe corresponds to an inner step at the upper end of the outer pipe, the upper end of the outer pipe is sleeved by a rubber barrel sealing mechanism, an anchoring mechanism is arranged in the middle of the outer pipe in a sleeved mode and located under the rubber barrel sealing mechanism, the lower end of the outer pipe is sleeved with a hydraulic mechanism, the hydraulic mechanism is connected with the anchoring mechanism, the lower portion of the outer pipe is provided with square holes in the circumferential direction, a locking block is arranged in one square hole, the locking block radially extrudes out of an inner groove embedded in the hydraulic mechanism, a circumferential groove is formed in the lower portion of the locking block and in the outer periphery of the center pipe, and the positions, under the circumferential groove, of the center pipe and the outer pipe are connected in the axial direction through a shear pin. After the sealing action of the hydraulic mechanism is finished, a rubber barrel is compressed through mechanical force produced when a feeding pipe column presses downward, compressive deformation of the pipe column on the rubber barrel is locked through a locking ring, and therefore contact stress between the rubber barrel and a bush of the packer can be well improved. Therefore, the sealing performance of the packer is improved.

The present invention relates to a disc brake operable to apply a clamping force to a rotatable disc. The disc brake includes a support bracket, slide pins coupled to the support bracket, inner and outer brake shoes and a caliper supported by the slide pins. The support bracket is a substantially rectangular frame defining a window. The window is adapted to accept a portion of a disc protruding therethrough. The support bracket includes a pair of spaced apart apertures extending through the frame where each aperture includes a threaded portion and a conical seat extending along an axis aligned to intersect the disc. The slide pins are threadingly engaged with a threaded portion. The slide pins do not extend through the window but protrude outwardly away from the window. Each slide pin has a tapered portion in engagement with one of the conical seats.

The invention relates to a multilayer type composite material roller, which is a circular column produced by compositing the materials with different hardness and different elasticity by interphase lamination. The high bearing capacity composite material roller fully keeps the allowable contact stress of a hard material. Under a support pad of a high elastomer material with low hardness, and the high compressive strength of a surface layer structure is preventing from being damaged. The whole circular column has certain elastic deformation, the bearing area is increased, and the corresponding bearing capacity is greatly increased. The problem that under outside force effect of the current common circular column, the contact area is small, so that the bearing capacity of the circular column is little, and the usage value and usage scope of the roller are reduced can be overcome. The novel laminated composite bearing roller has the advantages of large bearing capacity, simple structure, low cost, high cost performance, obvious noise reduction effect during a running process and wide application scope. The high bearing capacity composite material roller has considerable economic benefits and social benefits.

A power transmission system and a method for enhancing the efficiency of such systems are provided. The system and method includes a lubricant having a viscosity from about 0.01 centistokes to about 400.00 centistokes, power transmission components with a contact surface finish of less than about 16 microinches, and coating the power transmission components with the lubricant during operation of the system.

The invention discloses an intelligent reducer which comprises a power input eccentric shaft, a duplicate gear, a fixed inner gear and a power output inner gear, wherein an eccentric section is arranged on the power input eccentric shaft; the duplicate gear comprises an outer gear I and an outer gear II; the outer gear I and the outer gear II are arranged on the eccentric section in a rotary matched and sleeved mode; the fixed inner gear and the outer gear I form an engagement pair I with a small tooth difference; the power output inner gear and the outer gear II form an engagement pair II with a small tooth difference; the engagement pair I with the small tooth difference and the engagement pair II with the small tooth difference are respectively provided with a grooving elastic filtering structure; each grooving elastic filtering structure comprises gear tooth grooves formed in gear teeth of the gears and/or gear grooves formed in tooth grooves of the gears; elastic bodies are arranged inside the gear tooth grooves and the gear grooves. The intelligent reducer further comprises a monitoring device, wherein the monitoring device comprises a data receiving device and sensors; the sensors are arranged inside the elastic bodies and are used for monitoring the operation conditions of the engagement pair I with the small tooth difference and the engagement pair II with the small tooth difference respectively; the sensors are in wireless connection with the data receiving device.

The invention provides a high-nitrogen nickel-free super double-phase stainless steel wire rope for a high-speed elevator and a manufacturing method thereof. The high-nitrogen nickel-free super double-phase stainless steel wire rope comprises an outer-layer strand, an inner-layer strand and a central strand, wherein the outer-layer strand and the inner-layer strand are made of high-nitrogen nickel-free super double-phase stainless steel materials, and the central strand is made of polypropylene fibre materials; and protective grease is filled between the central strand and the inner-layer strand or between the central strand and the outer-layer strand and between the inner-layer strand and the outer-layer strand. According to the invention, the cost of a product is reduced, the contact stress between the stainless steel wire rope and a wheel groove is reduced, the strength is high, the wear resistance and the safety are greatly improved, and the service life is prolonged.

The invention relates to the technical field of battery testing equipment, and provides a high-current terminal post-type battery clamp, which comprises two supporting seats. Each supporting seat is provided with a groove respectively; the groove has a smooth curved surface and two planes; terminal posts at two ends of the battery are respectively sleeved with sleeves; the two sleeves are erected on the curved surface respectively; and an adjusting part for adjusting the contact stress between the sleeve and the curved surface and a circuit board electrically connected with the curved surface for measuring voltage and current parameters of the battery are inserted in the supporting seat. According to the above high-current terminal post-type battery clamp, as the sleeves are erected on the curved surfaces, through the adjusting effects of the adjusting part, the contact stress between the sleeves and the curved surfaces is increased, contact between the sleeves and the curved surfaces is tighter, the contact area is larger, the contact resistance is smaller, the high-current over current ability is reliable, the voltage and current parameters can be accurately acquired, the automatic degree is high, and batch use is facilitated.