90results about How to "Reduce maximum stress" patented technology

A leadless plastic chip carrier has a plurality of die attach pads on which a singulated semi-conductor die is mounted. At least one row of contact pads circumscribes the plurality of die attach pads and a power / ground ring is intermediate the contact pads and the die attach pads. Wire bonds connect the semiconductor die, the contact pads and the power / ground ring. An overmold covers the semi-conductor die, the die attach pads, the power / ground ring and the contact pads such that each of the die attach pads and the contact pads has one exposed surface.

The invention relates to a turbine blade arrangement consisting of rotating blades (4) respectively provided with a leg (8) which can be respectively inserted into a groove (9) on the outer circumference (2) of a turbine disk in a radial, positive fit and which are respectively provided with a profiled section (5) which has a lateral platform (6) located in an end area on the side of the disk. According to the invention, at least one part (10) of the platform is joined to the turbine disk by means of a retaining element which is independent from the leg (8) of the blades in order to extend the profiled sections of the rotating blades.

The invention discloses a sensitive structure and accelerometer with super-high acceleration displacement sensitivity and a manufacturing method. The micromechanical sensitive structure comprises a sensitive mass block, a high-reflective film plated on the sensitive mass block, an S-shaped beam type cantilever beam connected to the sensitive mass block and a silicon substrate connected with the tail end of the S-shaped beam type cantilever beam. The lower portion of the micromechanical sensitive structure is connected with a substrate with a groove. The S-shaped beam type cantilever beam is mainly formed by sequentially connecting four straight beams of a thigh beam, a first curved beam, a second curved beam and a shank beam. The sensitive mass block and the silicon substrate are both made of SOI substrates. The cantilever beam is made of a monocrystalline silicon device layer in the SOI substrate. According to the sensitive structure and accelerometer, the super-high acceleration displacement sensitivity is achieved, small off-axis crosstalk can still be kept, a micromachining process and an IC process can be compatible, the substrate conveying rate is high, mass manufacturing is easy, and in cooperation with a displacement reading-out system based on a grating interference cavity, super-high acceleration measuring sensitivity and precision can be achieved.

A variable compression ratio apparatus that changes the compression ratio of an air-fuel mixture in a combustion chamber according to a driving state of an engine, enablements may include a connecting rod receiving the combustion force from the piston; a pin link receiving a part of the combustion force from the connecting rod and rotating the crankshaft; a support link disposed substantially in parallel with the connecting rod; a division link receiving a part of the combustion force from the connecting rod and transmitting the part of the combustion force to the support link; a control link provided with one end coupled to the division link in order to change position of one end of the division link; and an eccentric camshaft coupled to other end of the control link in order to change position of a rotational axis of the control link.

The invention relates to a tensile foldable probe, which comprises a fixing part, a foldable part, and a probe point part. The foldable part is provided with a plurality of horizontal sections and a plurality of vertical sections which extend from one side of the fixing part to be in continuously reversed bent connection; the probe point part which is formed by vertically extending at the predetermined distance to the fixing part through the free ends of the horizontal sections at the end of the foldable part, and the probe point part and fixing part are positioned on different axial lines; when the probe point part is contacted with an object to be tested, the foldable part is driven to be stretched, stretching elastic force is provided to allow the probe point and the object to be tested to maintain the electrical contact; the stress can be dispersed by each horizontal section, so as to increase the elastic deformation amount; meanwhile, the tensile foldable probe has better structural stability, so as to meet the requirement of high density probe distribution of micro probe point distance.

The invention discloses fiber fabric with an open pore structure and a manufacturing method for a fiber composite material part with the open pore structure. The fiber track of the fiber fabric belongs to an elliptic curve family, and the lengths of a long axis and a short axis are changed progressively from an open pore part to the edge of the fiber fabric. Compared with the prior art, the fiber fabric has the advantages of fiber continuity, fiber direction parametrization, curvature radius controllability, capability of effectively reducing stress concentration, and applicability to batch production. The fiber composite material part which is made from the fiber fabric and has the open pore structure has the advantages of low cost, strong strength, convenience and easiness for manufacture and little fiber material waste.

In a silk hat-shaped external gear for a strain wave gearing, t(A)>t(C)>t(D)>t(B) is satisfied, where the thicknesses of the inner circumferential end (A), the middle part (B) and the outer circumferential end (C) of the diaphragm body portion of a diaphragm are t(A), t(B) and t(C), and where the thickness of the barrel-side end part (D) of the curved portion of the diaphragm is t(D). With reference to the thickness of the middle part (B), the thickness of the inner circumferential end (A) of the diaphragm is set so as to be thicker than conventional silk hat-shaped external gears. It is possible to realize an externally toothed gear capable of preventing diaphragm rupture due to thrust force at high load torque and having high fatigue strength.

The invention relates to a multi-axle dispersed power steering system for a load-carrying vehicle. The steering system comprises a steering mechanism and a power mechanism, wherein the steering mechanism comprises left and right rows of steering axles which are arranged at the bottom of a frame along a straight line, and first steering arms connected to the steering axles; two adjacent first steering arms are connected through a steering pull rod; at least two steering axles in the left and right rows of steering axles are connected with steering oil cylinders through second steering arms; and a steering unit consists of at least two steering oil cylinders which are symmetrically arranged in the left and right rows, and the steering axles connected with at least two steering pull rods. The steering system has the advantages that: power is dispersed; applied force output by the steering oil cylinders is more reasonable; the width and self weight of the vehicle are reduced, and the bearing capacity of the vehicle is improved; the deviation and abrasion of tires are reduced, the service life of the tires is prolonged, and cost is saved; the steering maneuverability and accuracy of the vehicle are improved, and the like.

The invention relates to pegs in steel-concrete composite structure, in particular to an anti-shear peg, and is intended to solve the problem that an existing peg has poor ant-wear bearing capacity during repeated loading. The anti-shear peg comprises a shank and a cap, the cap is arranged at the top of the shank, the diameter of the upper portion of the ant-shear peg is d, the lower portion of the shank is in the shape of a horn cone, the height of the lower portion of the shank is 5d, and the bottom diameter of the shank is 2-2.5 d and is also provided with a cylindrical bottom segment. The shape of the existing peg is modified, maximum stress of the peg is lowered, the yield limit anti-shear bearing capacity is improved under repeated loading effect, stress of a heat influencing area of a welding connector is reduced, stress of a heat-thermal influencing area of the welding connector is decreased, the shape of the shank is optimized so that plastic strain is transferred to a peg itself having good extensibility in a 4-time diameter range, and ultralow periodic fatigue under repeated loading action for the welding head is avoided.

The invention discloses a production method of large aperture aspheric mirrors, comprising the step of: (1) calculating a best fitting sphere according to aspheric degree gradient method, machining and completing an ultra-thin spherical mirror according to the best fitting sphere; (2) obtaining an actuator distribution initial scheme, according to the aspheric degree gradient change rate method, to obtain the final solution of the actuator distribution and the forced displacement quantity of each actuator after optimization; (3) machining and completing an actuator component; (4) arranging the completed ultra-thin sphere mirror on the actuator component, adjusting the displacement quantity of the actuator to approach the ultra-thin sphere mirror to the designed best fitting sphere radius and figure accuracy; (5) according to the forced displacement quantity of each actuator obtained in the step (2), adjusting the displacement actuator to deform the sphere mirror into the demanded aspheric figure to obtain the large aperture aspheric mirror. The invention avoids the difficulty in the processing and checking of large aperture aspheric mirrors, to reduce processing and checking difficulty, reduce production period and reduce production cost.

The invention discloses a forced continuous sprag clutch. The forced continuous sprag clutch comprises a wedge block (1), a holder (2), an inner ring (3) and an outer ring, wherein the wedge block is a weakly-magnetic wedge block (1) of which the end surface is of a plane structure; the inner ring (3) and the outer ring (4) are manufactured from ferromagnetic materials; the holder (2) is manufactured from non-ferromagnetic material. According to the forced continuous sprag clutch, the weakly-magnetic wedge block is adopted and can be in contact with the inner ring and the outer ring all the time can be achieved, thus a spring of an original forced continuous sprag clutch and an original groove for mounting the spring can be removed, and as a result, the failure of the clutch caused by the failure of the spring can be avoided; meanwhile, the strength of the wedge block can be improved, so that the bearing capacity of the clutch can be improved, the service life of the clutch can be prolonged, and the difficulty in processing of the wedge block can be reduced; the forced continuous sprag clutch is outstanding in comprehensive effect.

The invention discloses a gyroscopic moment limiting device of a hydraulic excavator. The gyroscopic moment limiting device comprises a two-position four-way hydraulically-controlled reversing valve, an overloading overflow valve, a shuttle valve and two one-way valves. Two oil inlet ports of the shuttle valve are connected onto two outlet ports of a pilot control valve of a gyration hydraulic system respectively. An oil outlet port of the shuttle valve is connected onto a liquid control port of the two-position four-way hydraulically-controlled reversing valve. Outlets of the one-way valves are mutually connected with an inlet of the overloading overflow valve. An oil port P and an oil port O of the two-position four-way hydraulically-controlled reversing valve are connected with an oil inlet and outlet way of a hydraulic motor. An oil port A and an oil port B of the two-position four-way hydraulically-controlled reversing valve are connected with inlet-end oil ways of the one-way valves respectively. An oil tank is connected at the outlet end of the overloading overflow valve. The pressure of the overloading overflow valve is set according to requirements on limitation of braking moment; the technological means of the gyroscopic moment limiting device is simple and convenient to carry out, starting moment can be equal to the braking moment during gyration, gyration braking pressure is reduced during excavation, and horizontal working load is reduced.

The embodiment of the invention discloses a flexible automobile radiator system comprising an upper supporting board, a lower supporting board, an external left supporting framework, an external right supporting framework, a core body, an upper main piece and a lower main piece. The upper main piece is arranged between the core body and an upper water chamber. The lower main piece is arranged between the core body and a lower water chamber. Reinforcing plates are arranged at the left side and right side of the core body. The reinforcing plates are in a variable cross-section structure. The middle thickness of the reinforcing plates is more than the edge thickness of the reinforcing plates. Each reinforcing plate is provided with flexible grooves which transversely extend, pass through thethickness direction of the reinforcing plate and are symmetrical to the middle point of the reinforcing plate. Each one of the upper main piece and the lower main piece comprises a left piece and a right piece. The inner ends of the left and right pieces are fixedly connected. The flexible automobile radiator system provided by the invention limits the distortion flexibility of the core body on the premise of ensuring the structure stability of the flexible automobile radiator system, so that the flexible automobile radiator system has the advantages of higher anti-vibration strength and longer service life.

The invention discloses a hock absorber for a silicone-oil belt pulley, comprising a belt pulley body, wherein the radial inner periphery of the front end face of the belt pulley body is provided with a position seam allowance for externally connecting belt pulley body, the radial outer periphery is provided with an annular inertia block cavity in which an inertia block adaptive to the shape of the inner cavity is arranged, and silicon oil is injected in the gap between the inertia block and the annular inertia block cavity; the back end face of the belt pulley body is provided with an annular heat-radiating groove, the belt pulley body is provided with a centrifugal heat-radiating hole for communicating with the inner cavity of the position seam allowance for externally connecting belt pulley body and the annular heat-radiating groove, and the diameter of the outer ring of the back end face of the belt pulley body is smaller than that of the front end face. The invention not only has compact structure, but also can effectively shorten the length of a diesel engine, thus realizing air convection of the front end face and the back end face of the shock absorber; the hock absorber for the silicone-oil belt pulley can be cooled continuously to enhance the heat radiating effect thereof, thus improving the reliability and prolonging the service life of thehock absorber for the silicone-oil belt pulley.

The invention relates to reinforcing canvas for an impact-resistant conveyor belt and a preparation method of the reinforcing canvas, and belongs to the technical field of industrial textiles. The reinforcing canvas comprises of a plurality of recycled honeycomb unit structures, each unit structure comprises a plurality of sets of warps and wefts, and the warps and wefts are interwoven to form thereinforcing canvas; the reinforcing canvas is prepared by weaving and gum dipping. According to the preparation method, black gum dipping is adopted to enable the color and luster of the reinforcingcanvas to be consistent with those of rubber, the impact force caused when a material falls on the surface of the conveyor belt can be buffered, the maximum stress on the rubber is reduced, the forcerange between the rubber and the material is expanded, the pressure at an impact point is reduced, the covered rubber on the working surface of the conveyor belt is protected, and the service life ofthe conveyor belt is prolonged.

The invention provides a novel wire and an application thereof. The novel wire comprises a force-bearing core, one or more conductor coating layers and a conductor twisting layer from inside to outside in sequence; the fore-bearing core is a special-shaped force-bearing core or special-shaped force-bearing core group; the special-shaped force-bearing core consists of a base material and reinforcefibers and is noncircular; each conductor coating layer is an aluminum, aluminum alloy, copper or copper alloy coating layer; and the conductor twisting layer is an aluminum, aluminum alloy, copper orcopper alloy wire which is wound around the conductor coating layer. By virtue of special structure, design and processing method, the shortcoming of the existing carbon fiber wire can be solved.

The invention provides a volute tooth shaped line, a volute plate structure and a compressor comprising same. The volute tooth shaped line is characterized in that a main bus comprises a central involute, a transition involute and an outside involute which are continuously arranged from center to the outside, wherein the central involute is a base circle involute; the transition involute is a variable-diameter base circle involute; the outside involute is a base circle involute; and the radius of a base circle is the maximum radius of the base circle of the variable-diameter base circle involute. According to the volute tooth shaped line, the variable-frequency base circle involute is introduced, so that the wall thickness of the volute plate is increased, and as a result, the radial gas leaking is reduced, and the volute compression ratio is increased.

The invention discloses a high-efficiency all-solid-state thulium laser packaging module. The high-efficiency all-solid-state thulium laser packaging module comprises cooling heat sinks, auxiliary heat sinks, strip-shaped Tm:YAG bonding crystals, TEC cooling modules, and thermal insulation materials. Based on the characteristics that a cooling surface absorbs heat while a heat dissipation surface discharges heat in working of each TEC cooling module, the cooling heat sinks and the auxiliary heat sinks are designed to realize low temperature cooling and end part auxiliary heating to gain regions of the Tm:YAG bonding crystals; simulation and analysis proves that an end-pumping solid-state laser adopting the laser modules not only can solve the problem of vapor condensation on an optical fracture surface in low-temperature working, but also can sharply lower thermal stress of crystals, so that pumping ultimate limit of the laser and light beam quality can be improved, and the output energy and output efficiency of the thulium laser pulse can be greatly improved.

The invention discloses a flat extrusion container capable of reducing the stress concentration of the extrusion container. The flat extrusion container comprises a circular inner sleeve, wherein a flat extrusion hole is formed in the middle of the inner sleeve, the axis of the flat extrusion hole is collinear with that of the inner sleeve, an outer sleeve is arranged outside the inner sleeve, the outer sleeve is in interference fit with the inner sleeve, the outer contour of the outer sleeve is formed by two parallel lines and two elliptic arcs, and the geometrical shape of the outer sleeve is flat elliptic. The outer sleeve is designed into a flat elliptic structure and is formed by the two parallel lines and the two elliptic arcs, and the magnitude of interference of the inner sleeve and the outer sleeve is 2 to 3.5 per thousand, so that the maximum stress when the whole flat extrusion container is operated can be preferably reduced, the maximum equivalent stress and equivalent strain on the inner sleeve can be effectively reduced for 10 to 20%, the extrusion container can be extruded for many times in harsh conditions, and the use cost is reduced.

A compressor rotor disk for a gas turbine includes a circumferential surface; and a plurality of dovetail slots formed along the circumferential surface, each dovetail slot comprising a cutout portion formed by removing a portion of a radially outer convex surface of the dovetail slot. The compressor rotor disk can reduce stresses generated in the compressor rotor disk by centrifugal force, by reducing the centrifugal force of the compressor rotor disk through the formation of the cutout portion at the radially outer portion of the compressor rotor disk, thereby enhancing the durability and reliability of the compressor rotor disk.

The invention discloses a bionic tire structure. The bonding mechanism of the vertebra and tenon of a snake is integrated and grafted into the end part of a belt ply of a tire, so that each belt ply forms a certain bevel angle and an interlamination difference along the horizontal and axial direction, the stress concentration on the should of the tire is improved and the stress between the belt ply and the tread rubber material is uniformly distributed. According to the belt ply structure of the tire, on the basis that an existing tire structure is only slightly modified, the bonding strength between belt ply and the tread rubber is enhanced; the occurrence that the edge part of the belt ply is likely to be displaced and deform during vulcanization later is reduced; the occurrences that the shoulder of the tire is cracked and the tire comes into burst due to overheat are reduced; the quality of the tire is greatly improved and the service life of the tire is greatly prolonged; The invention is also suitable for the design of the reverse wrapping end part of the tire; by arranging the bionic tire structure at the end parts of a reinforced layer and a carcass, the stress concentration at the bead of the tire can be remarkably reduced.

The invention discloses a centering disk, which is of a multi-layer structure formed by compounding a plurality of material layers or a multi-layer structure formed by compounding a plurality of material layers and a glue layer, and comprises a conductive layer positioned in a central area. The centering disk comprises a connecting cantilever, the connecting cantilever is connected with a first fixing part, the connecting cantilever comprises root parts and a cantilever body, the root parts are located at the two ends of the cantilever body, the first fixing part is connected with the root part of one end of the cantilever body, and the conducting layer of the root part is provided with a hollow area. Compared with the prior art, the centering disk has the advantages that the problems thatan integral copper layer is large in root rigidity, maximum in stress borne by the root and prone to fatigue fracture failure are solved, the structural rigidity of the root area is reduced, stress is reasonably distributed, the maximum stress borne by the root is reduced, and the anti-fatigue performance of the centering disk is improved.

The invention relates to a supporting seat for a balance shaft of a heavy vehicle axle. The supporting seat comprises a supporting pillar, wherein a pin shaft hole is formed in the bottom of the supporting pillar; a cross beam connection piece is arranged at the top end of the supporting pillar; a balance shaft hole is formed in the middle of the supporting pillar; and the supporting seat is characterized in that: a triangular reinforcement rib is arranged between the side face of the supporting pillar and the cross beam connection piece. As the triangular reinforcement rib is arranged between the side face of the supporting pillar and the cross beam connection piece, the maximum stress of the supporting seat is reduced from 710 MPa to 495 MPa and the reduction rate of the maximum stress is over 30 percent; and the supporting seat can properly reduce the weight of a product, so the manufacturing cost is reduced.

Provided are a rigid gear and flexible gear which are used for short-tube flexible-gear harmonic speed reducer and a machining process thereof. Inner teeth of the rigid gear are gear teeth with an inclination angle alpha, the inclination direction of the inclination angle alpha is consistent with the field angle theta2 at the position of a long shaft of the flexible gear, and the inclination angle alpha is 0.1 degree to 2 degrees. Top ends of two tooth profile curve line sections of the outer tooth profile of the flexible gear are connected through a tooth top straight line section. Each tooth profile curve line section is formed by connecting upper circular radius and lower circular radius in smooth transition mode. The harmonic speed reducer comprises the rigid gear, the flexible gear and a wave generator. The ratio of the length and the inner diameter of the flexible gear is smaller than 1. The flexible gear and the rigid gear in the short-tube flexible-wheel harmonic speed reducer are both machined through a slow-feeding wire cutting off machine. The gear teeth of the flexible gear and the gear teeth of the rigid gear are meshed in the certain inclination angle. The total contact area of the meshing teeth pair is increased by 15% compared with the condition where no inclination angle exists. Overlapping ratio of the harmonic gears is improved, and harmonic transmission rigidity is improved.

The invention discloses a lightweighting high-strength hub for a commercial vehicle, which is made of a high-strength aluminum alloy material, and the whole hub is made of the high-strength aluminum alloy material, so that the weight of the hub can be effectively reduced, and the weight reduction ratio can reach 48 percent; the yield strength of the high-strength aluminum alloy material is 276 MPa, and is between 74% (QT600) and 89% (QT450) of the yield strength of a ductile iron material. Through finite element analysis, the worst rollover working condition is considered, the center of an inner side disc face is arranged to be a variable cross-section circle, so the cross-section material of the hub can be better distributed; on the basis that it is guaranteed that parts have enough strength, the weight of the hub can be the lightest, the axial stress capacity is improved, and the product reliability is guaranteed.

The invention relates to a self-lubricating heavy-load support sliding sleeve comprising a thick-wall barrel with an axle hole; the outer wall of the barrel is provided with a self-lubricating body, and first stress unloading holes are evenly distributed in the middle of the barrel circumferentially; the sides, pointing to the axis of the barrel, of the first stress unloading holes all communicate with stress unloading cavities wider than the first stress unloading holes and symmetrical relative to the axis of the first stress unloading holes; and one end face of the barrel is provided with a shaft end cover fixing groove. In the support sliding sleeve, materials of non-bearing areas are reduced properly, and part load is evenly absorbed through reasonable self-deformation, so that the purpose of reducing the weight of the whole support sliding sleeve is achieved, and the design difficulty of other components in combined use is reduced.

The invention relates to an engine turbine outer ring made of a multi-element and multi-layer self-healing ceramic matrix composite. The turbine outer ring is made of the fiber-reinforced ceramic matrix composite. The fiber-reinforced ceramic matrix composite is sequentially composed of a fiber layer, a first matrix layer and a second matrix layer, wherein the first matrix layer is an aluminum nitride layer and is provided with fibers carbon fibers and / or silicon carbide fibers. According to the engine turbine outer ring made of the multi-element and multi-layer self-healing ceramic matrix composite, an AlN ceramic interface layer is additionally arranged between the fibers of the multi-element and multi-layer self-healing ceramic matrix composite and a silicon carbide matrix, so that themaximum stress in the turbine outer ring is reduced, energy in the composite is effectively released in the cooling process, formation of cracks is controlled, and the requirements of engines and especially high-performance aircraft engines can be better met.

The invention discloses a double splicing curvilinear type gear hob comprising a plurality of hob teeth. The tooth-shaped contour line of each hob tooth comprises a first tooth root straight line, a first main cutting straight line, a first auxiliary cutting straight line, a first tooth top curve, a second tooth top curve, a second auxiliary cutting straight line, a second main cutting straight line and a second tooth root straight line which are connected sequentially, wherein the first tooth top curve and the first auxiliary cutting straight line are connected and are tangential at the connection point, the second tooth top curve and the second auxiliary cutting straight line are connected and are tangential at the connection point, the first tooth top curve and the second tooth top curve are connected and are tangential at the connection point, the first tooth top curve is composed of a first top arc and a first bottom arc which are connected, the second tooth top curve is composedof a second top arc and a second bottom arc which are connected, the first top arc is connected to the second top arc, the first bottom arc is connected to the first auxiliary cutting straight line, and the second bottom arc is connected to the second auxiliary cutting straight line. The double splicing curvilinear type gear hob has the beneficial effects that a machined gear has high tooth root strength.

Disclosed are a red ginseng and / or a red ginseng extract obtained by subjecting (raw) ginseng to ultrasonic treatment and ultrahigh-pressure treatment and then steaming and drying the ginseng, and a method of preparing the same. Also disclosed are a whole ginseng composition including the red ginseng extract prepared by the method, a ginseng leaf extract and a ginseng berry extract, and a method of preparing the same. Advantageously, the red ginseng and the red ginseng extract produced by ultrasonic treatment and ultrahigh-pressure treatment according to the present invention have a lower maximum stress than the conventional red ginseng concentrate in terms of physical properties, reduced inconvenience during ingestion and storage, and increased active ingredient contents.