55results about How to "Reduce axial stiffness" patented technology

A premium threaded tubular connection including, on at least one threaded element, a distal abutment surface at the free end of a threaded element, and a lip sealing surface at a given distance from the threading. The lip includes an appendix that extends the lip towards its free end beyond the lip sealing surface so that the lip has both high radial stiffness and low axial stiffness. This results in enhanced performance as regards the seal of the threaded connection under pressure and/or under tension, and other advantages of precision of real makeup torque, mechanical strength in axial compression, a shock barrier effect, and tolerance in engaging the threaded elements.

The invention relates to a centrifugal pump, especially for blood, comprising a pump rotor which is arranged in a rotational manner and without a bearing in a liquid-tight and gas-tight closed housing, except for at least one inlet opening and at least one outlet opening. The rotor is also the rotor of a drive motor. The rotor is symmetrical with respect to the centre plane thereof and comprises an upper and a lower covering. The rotor and/or the pump housing are formed in such a way that the axial distances between the upper and the lower coverings and the upper and lower housing walls are smaller in the radially inner region of the rotor than in the radially outer region. In the radially inner region of the rotor, each lateral rotor chamber comprises a flow-restrictor gap which, when in operation, influences back flows oriented in a radially inward manner in the lateral rotor chambers, such that during an axial deflection of the rotor above and below the rotor, various pressure distributions appear, enabling forces acting upon the predominant surface of the coverings to be produced, the forces bringing about an axial stabilisation of the rotor and acting, in the same manner, against tilting of the rotor inside the housing.

A pneumatic tire has a tread portion provided with an asymmetrical tread pattern and comprising an inboard shoulder land portion, an inboard shoulder main groove, an inboard middle land portion, an inboard crown main groove, a center land portion, an outboard crown main groove, an outboard middle land portion, an outboard shoulder main groove, and an outboard shoulder land portion. The inboard middle land portion is provided with inboard middle axial grooves extending from the inboard shoulder main groove and each comprising a main portion and a turnback portion. The inboard shoulder land portion is provided with inboard shoulder sipes extending from the inboard shoulder main groove.

A method of manufacturing a composite structural member (1), comprising the step of laying up a stack of fibre reinforced laminate plies (12), wherein at least one of the plies is laid up as discrete first (13) and second ply (14) portions, and the fibres of the second portion (14) have a different characteristic from those of the first portion (13). Also, a composite structural member (1) manufactured according to the method.

The invention provides a composite spring damping adjustable vibration isolator. The composite spring damping adjustable vibration isolator comprises a shell provided with an opening at the upper end, a bottom plate is arranged below the shell, a connecting shaft is arranged in the shell, the upper end of the connecting shaft is capable extending out of the opening of the shell; a shaft shoulder is arranged at the middle part of the connecting shaft, a first belleville spring, an upper metal wire net pad and a baffle plate are sequentially arranged between the upper surface of the shaft shoulder and the top wall of the shell from the bottom to the top, the upper surface of the baffle plate is fitted with the top wall of the shell, a second belleville spring and a lower metal wire net pad are sequentially arranged between the lower surface of the shaft shoulder of the connecting shaft and the bottom plate from top to the bottom, and the bottom surface of the lower metal wire pad is fitted with the bottom plate; the lower end of the connecting shaft is provided with an inner bore, and a spiral spring is arranged in the inner bore; and a lining is arranged between the outer diameter of the spiral spring and the pore wall of the connecting shaft. The vibration isolation performances in three axial directions of the vibration isolator are less in difference, the damping can be independently adjusted, the vibration isolation performance and the performance stability are improved, and the use range of the vibration isolator is expanded.

The invention discloses a double-yield-point buckling restrained brace. The brace comprises a body, the body comprises a core unit, an outer restraining unit, an unbonded sliding mechanism unit and connecting units at the two ends, the core unit comprises a staged yield composition plate, the staged yield composition plate comprises a first yield steel plate and a second yield steel plate, and the outer restraining unit comprises an outer steel pipe and filler. The unbonded sliding mechanism unit is arranged between the core unit and the filler, and the connecting units are fixedly connected to the outer sides of a first connecting section and a second connecting section of a connecting area. According to the buckling restrained brace with the two yield sections, the buckling restrained brace has two yield points through construction, yield energy consumption can be achieved under small earthquakes, along with increase of earthquake action and increase of structural deformation, when medium earthquakes or large earthquakes are reached, the second yield section enters a working state, and the requirement of structural anti-seismic performance design is well met.

The invention provides a package member for packing a flexible member, in particular wiper rubber bars of a wiper. The package device comprises a movable conveying device, a supplying device, a blocking device which can be lifted or lowered from a place above the surface of the conveying device to block the flexible member, a pushing device enabling the flexible member to move along the conveying direction, and a grabbing device for grabbing the flexible member form the conveying device and pulling into the package.

The invention relates to a finger tip sealing device, which comprises a front baffle plate (1) and a rear baffle plate (2) with circular structures and a plurality of finger tip sheets (3) arranged between the front and rear baffle plate; wherein, a finger body (6) with clearing is provided from the internal diameter part of the finger tip sheet and finger bodies (6) between two adjacent finger tip sheets (3) are staggered from each other; wherein, a flexible constrictor (4) with circular structure is arranged between the front baffle plate (1) and the finger tip sheet (3) and the internal diameter of the flexible constrictor (4) is consistent with the rear baffle plate (2) and a plurality of cut grooves (5) are provided along the direction of the internal diameter. Equipped with the flexible constrictor, the finger tip sealing device of the invention can effectively eliminate the axial bending deformation of the finger bodies of the finger tip sheets so as to increase the sealing performance of the finger tip sealing device, and is characterized by simple structure and convenient processing and has larger economic values.

Apparatus and method for delivering and deploying an intravascular device into the vessel including an outer and inner tube that are axially linked by a housing structure at the proximal end of the catheter, and a retractable sleeve structure having a middle tube and sleeve tip. The sleeve tip is sealed to the inner tube at the distal end, and continuously extends into the middle tube. At the proximal end of the sleeve structure, the middle tube is sealed to either a housing structure or slideable proximal ring, forming a sealed chamber between the inner tube and the sleeve structure. A radial space is formed between the sleeve tip and the inner tube optimized for intravascular device placement. During retraction of the sleeve structure, the fold of the sleeve tip peels away from the device, which expands to its deployed state while minimizing axial forces and friction.

The invention discloses a piston for pressure balance, which is characterized in that the piston is a cylindrical tube piece with one end closed, the side wall of the longitudinal section of the cylindrical tube piece along the axle line is a V-shaped corrugated surface; the outer side wall and the inner side wall of the V-shaped corrugated surface have the same corrugation shape and the outer side wall is at the same level with the inner side wall along the radial direction. By utilizing the pressure balance, the piston of the invention can have the reliable sealing performance under the pressure in the deep sea and maintain the flexible movement of the piston.

A bellows having a substructure including a first end and a second end, the ends being movable relative to one another, circumferential bulges, which are spaced apart by first constricted regions, being formed in the substructure between the ends, and a second constricted region being formed in at least one bulge. The width of the second constricted region corresponds at least to its height in order to reduce the axial stiffness and increase the radial stiffness.

Wrinkling of a contoured composite laminate part during forming to contour is reduced by using laminate plies having off-angle reinforcing fibers that provide the part with primary axial strength along a major axis of loading.

The invention discloses a viscous fluid damper for the on-orbit vibration isolation of a spatial load, and belongs to the technical field of space optics. The technical problems of difficulty in sealing, low flexural rigidity, poor environmental adaptability, insensitivity to spatial micro vibration and inconsistency between performance under a spatial zero-gravity condition and performance on the ground in the prior art are solved. A wave spring piece I is fixedly connected to the top end of an intermediate shaft through a damping screw I, wherein an upper oil cavity is formed between the wave spring piece I and an end cover; the wave spring piece I is sealed with the upper oil cavity through an O-shaped sealing ring I1, and is sealed with the upper end of the intermediate shaft through an O-shaped sealing ring I2; a wave spring piece II is fixedly connected to the bottom end of the intermediate shaft through a damping screw II; a lower oil cavity is formed between the wave spring piece II and a base; the wave spring piece II is sealed with the lower oil cavity through an O-shaped sealing ring II1, and is sealed with the bottom end of the intermediate shaft through an O-shaped sealing ring II2.

The invention discloses a serial elastic transmission device based on an integral flexible hinge spring. The device is characterized by consisting of two parts of an input assembly and an output assembly; the input assembly comprises a slide bearing, an adjusting sleeve, a locking nut, bearings pairwise mounted and pretightened, and an input plate and a center shaft integrated; the output assemblycomprises rolling bearings, a fixed screw, and a buffer plate, a flexible hinge spring and an output plate integrated; the input assembly and the output assembly are connected and pretightened through the adjusting sleeve; m rails are uniformly arranged on the input plate in the peripheral direction; and m rolling bearings are arranged in the same positions on the buffer plate, and correspond tothe rails one to one. The flexible hinge spring is used for replacing a traditional snap spring; and through overall machining technology, multiple parts needing to be assembled are integrated as an overall-machined part, so that assembly errors and gaps are prevented, the structure rigidity and stability are improved, and the transmission precision is improved.

The invention discloses a compressor core flexible supporting structure. The compressor core flexible supporting structure comprises a gasket, an elastic element, an upper bush, a lower bush and a convex nail; the gasket is arranged at the upper end of the upper bush, the lower bush is arranged on the convex nail in a sleeving manner, the lower portion of the elastic element is arranged on the lower bush in a sleeving manner, the upper bush is inserted in the upper portion of the elastic element, an overlapping area is arranged between the lower portion of the upper bush and the upper portionof the lower bush, and the lower portion of the upper bush and the upper portion of the lower bush have a certain gap in the overlapping area. The flexible supporting structure is adopted to reduce connection rigidity between a compressor core and a shell, the effect of reducing compressor vibration is achieved, and shell crashing during compressor starting can be avoided.

The invention relates to the field of civil construction engineering, in particular to a grout sleeve with a function of coordination deformation with concrete for prefabricated components. The groutsleeve comprises a sleeve body, a grouting port and a grout outlet are formed in the sleeve body, and a convex groove and a reinforcing rib are arranged on the side wall of the sleeve body. Under thepremise that the ring rigidity of the sleeve is not affected basically, the grout sleeve with the decreased vertical rigidity and shearing rigidity can be used for a connecting position of the concrete prefabricated components. The rigidity of the positions, at the sleeve, of the prefabricated components (plate, beam, column and the like) is prevented from being increased excessively, component deformation is prevented from being excessively concentrated on concrete of the two ends of the sleeve accordingly, and a large crack is prevented from occurring to the concrete at the two ends of the sleeve; and the phenomena of short columns and deep beams can also be avoided.