57results about How to "Reduce fatigue failure" patented technology

A juncture and method for changing direction of fuel flow in a high pressure fuel injection system such as a common rail and/or a fuel pump, the juncture comprising a body, a first passage formed in the body having a first diameter and a longitudinal axis extending therethrough, the first passage including a groove positioned along a portion of the longitudinal axis, and a second passage formed in the body having a second diameter, a central axis extending therethrough, and an opening, the opening of the second passage being provided in the groove of the first passage to allow fluidic communication between the second passage and the first passage so that stresses at the juncture caused by high pressure fuel changing direction of flow is reduced.

A high-pressure fuel injection pipe having connecting head portion is provided which is capable of eliminating a fear of the occurrence of cavitation erosion of the inner surface of the connecting head portion and a fatigue failure of the same head portion by having a contour of a cross section of an annular pocket occurring in an inner part of the connecting head portion during a head portion processing operation extend shallowly and gently. This fuel injection pipe has at a connecting end portion of a thick-walled steel pipe having a relatively small diameter, including a seat surface, an annular flange formed so that the flange is axially spaced from the seat surface, and a conical surface connected to the seat surface, extending therefrom to the annular flange and tapering off to a free end of the connecting head portion, wherein the conical surface is provided at a part thereof with an annular, shallow, cross-sectionally curved recess.

The invention discloses a light-type full-hydraulic drilling machine for underground drilling of a coal mine. The light-type full-hydraulic drilling machine comprises a stander, a drilling rod, a water braid, a guide rail, a propelling hydraulic cylinder, a hydraulic clamp and a drill power head, wherein the hydraulic clamp comprises a clamp base, a supporting seat, a clamping hydraulic cylinder and a clamp clamping tile; the water braid comprises a water braid shell, a water braid shaft, a water braid hollow shaft, two anti-abrasion ring, an isolating ring, a front end cover, a rear end cover and an anti-abrasion sealing ring; the drill power head comprises a speed reduction box body, a connection frame, a gear shaft, a hollow stepped shaft, a hydraulic motor, a spring mounting seat, a spring limiting seat, an end face check ring, a gear, a disk-type spring group, a power head clamping tile and a clamping hydraulic cylinder. The light-type full-hydraulic drilling machine is compact in structure, convenient and low in cost; the energy consumption is reduced, the power transmission efficiency is improved, and the clamping force on the drilling rod is stable and reliable; the service lives of the anti-abrasion sealing ring and the water braid shaft can be prolonged, the replacement trouble is reduced, the construction progress and safe production are guaranteed, vibration of the drilling machine is reduced, and the drilling rod is prevented from being broken.

A mechanical multidirectional absorber relates to the field of oil and gas well projects and geological exploration drilling and comprises an upper joint. The lower end of the upper joint is connected with a mandrel which comprises a large-outer-diameter mandrel, a medium-outer-diameter mandrel and a small-outer-diameter mandrel. A mud scraping ring seat, a stabilizing cylinder, a spline cylinder and a guide cylinder are arranged outside the mandrels. The stabilizing cylinder comprises a large-inner-diameter stabilizing cylinder and a small-inner-diameter stabilizing cylinder. An upper hydraulic chamber is arranged between the medium-outer-diameter mandrel and the large-inner-diameter stabilizing cylinder. A damping ring gap is arranged between the medium-outer-diameter mandrel and the small-inner-diameter stabilizing cylinder. A piston, a thrust bearing and an upper elastomer are arranged between the mandrel and the spline cylinder as well as the guide cylinder. The piston comprises a piston body and a piston joint. The piston body comprises a large-inner-diameter piston body and a small-inner-diameter piston body and is provided with a torque transforming mechanism. A lower hydraulic chamber is arranged between the small-outer-diameter mandrel and the large-inner-diameter piston body. A guide rod is connected with the lower end of the mandrel. A lower elastomer and a lower joint are arranged between the guide rod and the guide cylinder. The lower joint is connected with the lower end of the guide cylinder. The mechanical multidirectional absorber integrates the functions of damping, vibration attenuation and vibration isolation and has good safety.

A shunt pulsation trap for a positive displacement (PD) internal combustion engine (ICE) reduces pulsation, noise, vibration and harshness (NVH), and overall size of the exhaust system and improves cycle (fuel) efficiency. Generally, a shunt pulsation trap for a PD-ICE is configured to trap and attenuate gas pulsations before discharge to engine outlet and comprises a chamber (trap volume) adjacent to the PD-ICE cavity, therein housed various pulsation dampening means or pulsation containment means, at least one relief port (trap inlet) branching off from the PD-ICE cavity into the pulsation trap chamber and a feedback region (trap outlet) communicating with the PD-ICE outlet. The associated principles, methods and embodiments are disclosed.

A semiconductor chip package includes an interconnection substrate, a central substrate, a peripheral substrate and a semiconductor chip sandwiched between the interconnection substrate and the central substrate. The interconnection substrate has a recessed cavity for receiving the semiconductor chip. The peripheral substrate is separated from the central substrate thereby decreasing the stresses caused by CTE mismatch of the semiconductor chip package. Furthermore, both the central substrate and the peripheral substrate are mechanically and electrically connected to the interconnection substrate such that the semiconductor chip is electrically connected to the peripheral substrate through the central substrate and the interconnection substrate.

The invention belongs to the field of wind power technology, and particularly relates to a wind farm turbulence optimization method and system. The method includes: acquiring turbulence intensity data in a main flow direction within a predetermined distance in front of an installation location of a wind turbine on the basis of CFD (Computational Fluid Dynamics) flow field analysis; and analyzing and determining, on the basis of the acquired turbulence intensity data and wind farm measurement data, a location and a flow-guiding height of a flow-guiding wind grid mesh of utilizing mesh flow-guiding to optimize turbulence, According to the method and system, a mesh flow-guiding scheme is utilized, airflow of a wind farm is optimized, the turbulence intensity is reduced, component damage and gear box and blade fatigue invalidation caused by violent vibration, due to the turbulence, of the wind turbine are reduced, and the safety of wind turbine running is improved.

A microelectromechanical system (MEMS) probe for electric connection between a tested contact point of an object to be tested and a testing contact point of a test circuit. The MEMS probe includes: a first terminal contact portion; a second terminal contact portion movable close to and away from the first terminal contact portion; and an elastic connecting portion connecting the first terminal contact portion and the second terminal contact portion, elastically deformed by an approach of the second terminal contact portion and comprising a plurality of plating layers stacked in the elastic deformation direction. According to the present disclosure, the MEMS probe includes a plurality of plating layers stacked in the elastic deformation direction, thereby decreasing fatigue failure and improving durability.

Tunable fluid end embodiments comprise a family, each family member comprising a pump housing with at least one installed tunable component chosen from: tunable valve assemblies, tunable valve seats, tunable radial arrays and/or tunable plunger seals. For example, a tunable valve assembly or tunable radial array selectively attenuates valve-generated vibration at its source, thus reducing the likelihood of fluid end failures associated with fatigue cracking and/or corrosion fatigue. Adding tunable valve seats and/or tunable plunger seals to a fluid end facilitates optimal damping and/or selective attenuation of vibration at one or more predetermined (and frequently localized) fluid end resonant frequencies. Thus, the likelihood of exciting destructive resonances in a pump's fluid end housing is further reduced. Optimized vibration attenuation and optimized fluid end damping are provided by altering resonant frequencies in each tunable component in relation to one or more fluid end resonant frequencies and/or tunable component resonant frequencies.

Tunable fluid end embodiments comprise a family, each family member comprising a pump housing with at least one installed tunable component chosen from: tunable valve assemblies, tunable valve seats, tunable radial arrays and/or tunable plunger seals. For example, a tunable valve assembly or tunable radial array selectively attenuates valve-generated vibration at its source, thus reducing the likelihood of fluid end failures associated with fatigue cracking and/or corrosion fatigue. Adding tunable valve seats and/or tunable plunger seals to a fluid end facilitates optimal damping and/or selective attenuation of vibration at one or more predetermined (and frequently localized) fluid end resonant frequencies. Thus, the likelihood of exciting destructive resonances in a pump's fluid end housing is further reduced. Optimized vibration attenuation and optimized fluid end damping are provided by altering resonant frequencies in each tunable component in relation to one or more fluid end resonant frequencies and/or tunable component resonant frequencies.

The invention discloses an anodic oxidation protection method for a bearing surface and belongs to the technical field of machine manufacturing. The method comprises the processing steps: (1) preparing an electrolyte; (2) preparing a bearing material; (3) carrying out oxidation treatment; (4) carrying out after-treatment. According to the method, the problem of fatigue failure caused by long-time rolling friction between internal surfaces of the existing bearings and rolling balls is solved; the method has the advantages of simplicity, low cost and easiness in processing.