127results about How to "Avoid fatigue failure" patented technology

In a structure of a semiconductor device, a Si chip and a metal leadframe are jointed by metallic bond via a porous joint layer made of high conductive metal, having a three-dimensional network structure and using Ag as a bonding material, and a film containing Zn oxide or Al oxide is formed on a surface of a semiconductor assembly contacting to a polymer resin. In this manner, by the joint with the joint layer having the porous structure mainly made of Ag, thermal stress load of the Si chip can be reduced, and fatigue life of the joint layer itself can be improved. Besides, since adhesion of the polymer resin to the film can be enhanced by the anchor effect, occurrence of cracks in a bonding portion can be prevented, so that a highly-reliable Pb-free semiconductor device can be provided.

A monolayer foamed corrugated sleeve for protecting elongate substrates is disclosed. The sleeve is extruded from a polymer and a foaming agent. The polymer may be a non-elastomeric thermoplastic, a thermoplastic elastomer or a combination of the two. The sleeve is extruded from a nozzle having a cross sectional area which decreases along its length to maintain pressure on the extrudate and prevent premature foaming. The extrudate is released from the nozzle into moving mold blocks. A blow rod within the mold blocks provides gas pressure to force the extrudate against the blocks. An obturation device is mounted on the blow rod to control the gas pressure.

Disclosed herein are a soldering connecting pin, a semiconductor package substrate and a method of mounting a semiconductor chip using the same. A semiconductor chip is mounted on the printed circuit board using the soldering connecting pin inserted into a through-hole of the printed circuit board, thereby preventing deformation of the semiconductor package substrate and fatigue failure due to external shocks.

A tensioner enables easy and reliable reinstallation of the tensioner and belt in the field service while simultaneously making it possible to utilize a one-way clutch device to ensure continuous belt tension control without cumbersome manual alignment and/or realignment procedures. The tensioner has a pivot shaft configured for mounting on an engine surface. A tensioner arm is mounted on the pivot shaft for pivotal movement between a free arm stop position and premount stop position. A belt-engaging pulley is mounted for rotation on the tensioner arm. A base cup is rotatably mounted around an end of the pivot shaft. The base cup has an arcuate slot having a free arm stop end and a premount stop end. The tensioner arm cooperates with the arcuate slot limiting the pivotal movement of the tensioner arm. A spring is coupled between the tensioner arm and the base cup biasing the tensioner arm in a belt-tensioning direction. An anti-kickback stop mechanism engages the pivot shaft and has a lost motion connection with the tensioner arm wherein the tensioner arm moves through a free range without engaging the anti-kickback mechanism. The tensioner arm 1) rotates the anti-kickback mechanism as the tensioner arm moves beyond the free range towards the premount stop position and 2) enables the anti-kickback mechanism as the tensioner arm moves beyond the free range towards the free arm stop position, limiting travel of the tensioner arm therebeyond. The spring is fixable relative to the pivot shaft upon the tensioner being mounted on the engine surface.

A hoisting and lowering driving engagement multi-row chain is disclosed, in which bending of the connecting pins in the chain is suppressed to avoid fatigue failure. Additionally, the load carrying balance in the chain width direction is improved, and contact vibrations and contact noises generated between the chain and the hoisting and lowering sprockets are suppressed. Endurance of the bush in the chain is thereby improved. Bending of connecting pins is avoided by press-fitting bushes, through which connecting pins pass, into intermediate tooth plates. This also improves load carrying balance widthwise. Contact noises and vibrations between the bushes and sprockets are suppressed by providing bushes with a separate sprocket engagement portion having a larger diameter than the press-fitting portion of the bushes.

The invention discloses a gas discharge valve. The gas discharge valve comprises a valve seat, a valve body and a valve deck. A containing cavity is formed in the valve deck. A gas channel communicating with the containing cavity is formed in the circumferential wall of the containing cavity. A gas outlet hole communicating with the containing cavity is formed in the top wall of the containing cavity. A blind hole is formed in the valve body. The valve body is contained in the containing cavity of the valve deck. When compressed gas having a preset pressure is discharged out from a gas discharging hole, the valve body contained in the containing cavity of the valve deck is ejected by the discharged gas and is sucked to the inner side of the top wall of the containing cavity, and the compressed gas discharged from the gas discharging hole flows out from the gas channel of the valve deck. According to the gas discharge valve, when the gas is discharged, the valve body can be reliably sucked to the inner side of the top wall of the containing cavity of the valve deck; and in this way, the gas discharge valve can be reliably kept at the opened state when the gas is discharged, gas discharging is guaranteed to be smooth, and the situation that the gas discharge valve is frequently switched and fatigued and is ineffective because of gas pressure fluctuation can be avoided.

A clamp is designed and built for a particular application. The clamp may be affixed to, or attached at a specific joint on an existing telescopic pole structure. The clamp may be made in two or more sections that comprise shells that have been shaped to match the outside diameters of both sections of the existing telescopic joint.

The invention discloses a shock absorber for a drilling tool in oil-gas drilling. The shock absorber comprises a mandrel, wherein a spline and a fixed piston are arranged on the mandrel; a spline outer cylinder is arranged on the spline, and the spline outer cylinder and the spline form an axial sliding pair; a plurality of damping channels are axially formed between the spline and the spline outer cylinder; the lower end of the spline outer cylinder is connected with a lower outer cylinder, and the upper end of the spline outer cylinder is sequentially connected with an upper outer cylinder,an upper seal joint and an upper joint; the spline outer cylinder and the upper outer cylinder, the upper seal joint and the lower outer cylinder, the fixed piston respectively form an upper annular cavity and a lower annular cavity at the periphery of the mandrel, and the two cavities are communicated through the damping channels; an oil injection nozzle and a gas injection nozzle are respectively formed on the spline outer cylinder and the upper seal joint in the radial direction; the oil injection nozzle is communicated with the damping channels; the gas injection nozzle is communicated with the upper annular cavity through a gas injection annular channel; and a movable piston is arranged in the upper annular cavity. The shock absorber for the drilling tool in the oil-gas drilling integrates liquid, damping and gas shock absorption so as to avoid the fatigue failure of the drilling tool, and has the characteristics of high shock absorption performance, long service life, low manufacturing cost, simple structure, a few quick-wear parts, convenience of maintenance and the like.

The invention provides a permanent magnet suspension wing panel aeroelastic vibration generating set. The permanent magnet suspension wing panel aeroelastic vibration generating set comprises two support forms, namely, a double-side double support form and a middle single support form, a wing panel is supported by permanent magnet suspension; and an electromagnetic induction energy transformation type is adopted. Power is generated by means of aeroelastic vibration of a permanent magnet suspension support wing panel, and a mechanical elastic support element in a conventional wing panel aeroelastic vibration generating set design is removed, so that the problem of fatigue of a wing panel support element is solved fundamentally. A linear bearing is taken as a guide device for a support rod to perform ups and downs in conjunction with the wing panel, and a suspension annular permanent magnet is fixedly connected to the support rod, so that surface contact between the suspension annular permanent magnet and a cylindrical sleeve is avoided, and friction force of permanent magnet suspension support is lowered. The permanent magnet suspension support has a nonlinear rigidity feature, and the non-linear rigidity feature of the suspension annular permanent magnet can be changed by adjusting a distance between fixed annular permanent magnets at two ends of the cylindrical sleeve, so that the wing panel can perform chattering motion at a relatively low wind speed.

The embodiment of the invention discloses a continuous jar. The continuous jar comprises a shell, a jarring block, a hydraulic driving assembly and an elastic driving assembly, wherein an upper jarring table shoulder and a lower jarring table shoulder which are oppositely arranged are arranged in the shell; the jarring block is arranged in the shell and located between the upper jarring table shoulder and the lower jarring table shoulder, a first axial through hole is formed in the jarring block, and the jarring block can axially move along the shell; the hydraulic driving assembly is locatedat the upper portion of the jarring block, can move opposite to the shell, can plug the first axial through hole, and therefore drives the jarring block to move downwards in the axial direction of theshell; the elastic driving assembly is located at the lower portion of the jarring block, and can drive the jarring block to move upwards in the axial direction of the shell when the hydraulic driving assembly is separated from the jarring block. By means of the continuous jar in the embodiment, it can be avoided that as a conventional jar is repeatedly pulled and pressed, a pipe column is fatigue and ineffective.

The invention discloses a barrel for a car silencer, comprising a shell (1) and a vibration isolation element (4), wherein the inner part of the shell (1) is provided with an inner tube (2), and the two ends of the shell (1) are respectively provided with an end cover (3) which is provided with an opening; at least one end of the inner tube (2) is installed on the corresponding opening of the end cover (3) through the vibration isolation element (4), and the relative position between the part of connecting the vibration isolation element (4) and the inner tube (2) and the end cover (3) is variable along the axial direction of the inner tube (2). Through the automatic adjustment of the inner tube length in the axial direction of the inner tube, thermal stress is released, and thermal stress action does not exist between the inner tube and the end cover, thereby avoiding fatigue failure of the inner tube and the end cover under the action of the thermal stress so that the barrel has long service life so as to prolong the service life of the car silencer. The invention also provides the car silencer comprising the barrel.

The invention discloses an analysis and evaluation method for hermetic seal thread of a tubing of a high-temperature high-pressure gas well. The hermetic seal applicability of a limit tolerance samplein the condition load and stress correction environment under different make-up torques is tested and evaluated by analyzing the make-up torque of the hermetic seal thread according to down-hole workenvironment characteristics of the high-temperature high-pressure gas well and structural characteristics of the thread; according to analysis on the make-up torque of the hermetic seal thread, the limit tolerance and torque are selected to analyze hermetic seal finite elements under the condition load spectrum, and the down-hole condition load spectrum sealing after make-up of the hermetic sealthread is analyzed; and thread dynamic-load anti-fatigue analysis in the gas production process of a down-hole tubing string is analyzed, an applicability test and evaluation process is determined according to links likely to fail in analysis, and the applicable reliability of the thread is evaluated and analyzed comprehensively. The method can be widely applied to high-temperature high-pressure gas wells as well as unconventional multi-segment high cracking gas wells, especially to evaluate selection and applicability of threads of well-completion tubing strings of deep and ultradeep wells inTarim and southwest oil and gas fields.

The invention relates to the technical field of bridge engineering, in particular to an orthotropic steel bridge deck closed stiffening rib structure with built-in rib strips. The orthotropic steel bridge deck closed stiffening rib structure with the built-in rib strips comprises a bridge deck slab, a diaphragm plate fixed to the bottom of the bridge deck slab, a middle web and a plurality of closed stiffening ribs. The diaphragm plate is perpendicular to the middle web. The multiple closed stiffening ribs are evenly arranged on the diaphragm plate and located on two sides of the middle web. The two side walls of each closed stiffening rib are both fixedly connected with the diaphragm plate. The rib strips are arranged in the positions, corresponding to the connecting portions of the diaphragm plate, of the two inner sides of each closed stiffening rib. The plate surfaces of the rib strips and the diaphragm plate are arranged in a coplanar mode. By arranging the small rib strips in closed stiffening rib inner cavities, corresponding to the connecting portions of the diaphragm plate, of the closed stiffening ribs, the diaphragm plate provides effective elastic supporting for the closed stiffening ribs, and thus deformation and stress of force bearing sensitive areas of the closed stiffening ribs and the connecting portions of the diaphragm plate are improved, the problem of fatigue cracks in the intersecting positions of the closed stiffening ribs and the diaphragm plate of an orthotropic steel bridge deck is solved, and the fatigue performance of the orthotropic steel bridge deck is improved.

The present invention particularly provides a lifting plate of a window regulator with retainers that are operably interconnected by means of a motion-transmitting element for a tilt-free operation of a window screen. The window regulator comprising a slidable lifting plate mounted on a vertical guide rail, a pair of flanges disposed on the rear side of lifting plate to mate with said guide rail and to provide a tilt-free sliding support to the lifting plate. A pair of retainers with locking means is operably connected by means of a motion-transmitting element. The motion transmitting element is disposed to form a contact-free crossover of said motion-transmitting element on the rear side of the lifting plate.

A modular steel bridge is configured by combining at least two steel girder segments, and it includes a bearing block installed to be connected to an upper flange of a connection end of each steel girder segment and a web, and a hinge assembly installed to be attachable to the lower flange of each connection end and hinge-connecting the connection ends.