42results about How to "Improve bearing stiffness" patented technology

A reciprocating linear actuator in which a slide and a counter slide are arranged for linear movement within a hollow guide. The actuator has driving force generating means for generating a driving force between the slide and the counter slide and also has bearing structures formed individually between the guide and the slide and between the guide and the counter slide. If an external force acts on the slide, the external force is transmitted from the slide to the guide through the bearing structure between them.

A cylindrical fluid dynamic pressure bearing includes: a shaft hole which has an inner peripheral surface and into which a shaft is inserted; plural separation grooves formed at equal intervals on the inner peripheral surface in a circumferential direction, the separation grooves extending in an axial direction and dividing the inner peripheral surface in the circumferential direction; and circular arc surfaces formed on the inner peripheral surface between the separation grooves, the circular arc surfaces being eccentric with respect to a center of an outer diameter of the bearing and being inwardly biased toward one circumferential direction, wherein the number of the separation grooves is 3 to 6, the number of the circular arc surfaces is the same as the number of the separation grooves, and the separation groove has a width corresponding to an angle of 8 to 20 degrees in the circumferential direction of which a center is an axial center of the bearing, and has a maximum depth of 0.05 to 0.15 mm.

A method for operating a rotating machinery comprising a rotor, a rotor shaft, and at least one journal bearing supporting the rotor shaft is disclosed. The bearing comprises a bearing housing, a bearing surface in the bearing housing, a sleeve torsionally and axially fitted on the shaft, and a lubrication oil film filling a clearance between the outer surface of the sleeve and the bearing surface. The method comprises the step of modifying the clearance by modifying a radial dimension of the outer surface of the sleeve as a function of a rotation speed of the shaft.

The invention provides a controllable damping molecule spring vehicle suspension. The controllable damping molecule spring vehicle suspension comprises a compressible hydraulic cylinder, an incompressible auxiliary cylinder, a piston, molecular spring mixed mediums and a magnetorheological fluid; the compressible hydraulic cylinder comprises an end cap and a cylinder body which are mutually connected, a membrane sheet is arranged at the position between the end cap and the cylinder body, and a cavity formed between the membrane sheet and the cylinder body is fully filled with the molecular spring mixed mediums; the incompressible auxiliary cylinder comprises an auxiliary cylinder body, and the auxiliary cylinder body is arranged at the end, away from the cylinder body, of the end cap in asleeving mode; a first sealing ring is arranged between the inner wall of the auxiliary cylinder body and the outer wall of the end cap to form a sealed chamber, and the chamber is fully filled with the magnetorheological fluid; the piston comprises main pistons and an auxiliary piston, wherein the main pistons and the auxiliary piston are mutually connected, the main pistons are located in the end cap and the auxiliary cylinder body and sequentially penetrate through the end cap and the auxiliary cylinder body to extend to the exterior of the auxiliary cylinder body; and the auxiliary pistonis located in the cavity formed between the membrane sheet and the cylinder body. According to the controllable damping molecule spring vehicle suspension, the structure is simple, performance is superior, and ride comfort and the control ability of a vehicle can be effectively improved.

A twin-clutch manual gearbox has a first input shaft and a second input shaft to which engine rotation is selectively input via individual clutches. The second input shaft is rotatably fitted onto the first input shaft so that the first input shaft protrudes from an end of the second input shaft farthest from the engine. First gearsets are located between the protruding end of the first input shaft and a layshaft located between the first and second input shafts. Second gearsets are located between the second input shaft and the layshaft. The second gearsets are positioned such that the gearset of the lowest gearbox speed which is capable of providing a bearing retaining space between the first input shaft and the second input shaft is positioned farthest from the engine, and the gearset of the highest gearbox speed is positioned closest to the engine.

An inner peripheral surface and a lower end surface of a bearing sleeve made of a sintered metal are each formed into a smooth cylindrical surface or a flat surface that does not have a dynamic pressure generating portion. Thus, a step of forming the dynamic pressure generating portion can be omitted from a manufacturing step of the bearing sleeve, and cost of dies can be markedly reduced. Further, the inner peripheral surface of the bearing sleeve is formed into the smooth cylindrical surface, and hence a radial dynamic pressure generating portion is formed on an outer peripheral surface of a shaft member. However, the outer peripheral surface of the shaft portion is accessible to tools, and hence the radial dynamic pressure generating portion can be formed easily with high accuracy. As a result, accuracy of a radial bearing gap is enhanced so that a bearing rigidity is enhanced.

A wheel bearing unit having at least one outer part, at least one inner part and having at least two rows of rolling elements between the outer part and the inner part, on the outer part at least one inner raceway, and on the inner part at least one outer raceway for the rolling elements of a row.

Hard disk drive track density is increased by selectively increasing the stiffness of a fluid dynamic bearing (FDB) motor during servo write. Applying a load to the shaft of a fixed shaft FDB motor to close the bearing gaps increases stiffness. Alternatively, the disk drive is cooled to increase bearing fluid viscosity or the motor is operated at an increased rotational velocity.

The invention belongs to the technical field of recovery devices, and particularly relates to an underwater spring buffering and recovery platform. The underwater spring buffering and recovery platform aims to prevent experimental articles from being damaged and facilitate recovery. The underwater spring buffering and recovery platform is characterized in that a recovery platform is overall designed underwater in an approximate-zero-buoyancy mode, and power consumed by a hoisting mechanism is small; a buffering unit is small in inertia mass and good in buffering performance; because buffering plates are connected through elastic ropes, independence of the buffering plates is guaranteed, and certain buffering force can be transmitted; because a buffering layer is supported by springs, rigid requirements for the situation that the platform rises above the water surface are met, and operation stability is guaranteed; floating barrels are evenly arranged at the bottom of a base frame, and therefore the load-carrying capability of the base frame is improved; a counter weight convenient to disassemble and assemble is arranged around a hoisting point, and therefore the load-carrying capability of the platform underwater can be adjusted.

The invention relates to a bearing, in particular a chassis bearing for the rear axle of a motor vehicle, with an outer bearing sleeve, an inner bearing sleeve, at least one elastomer body arranged between the outer and inner bearing sleeves and two chambers which are arranged laterally opposite each other on the outer bearing sleeve. The chambers each have an adjusting element. The adjusting elements are displaceable. When subjected to pressure, the adjusting elements are displaced inwardly against the inner bearing sleeve. The adjusting elements can be clamped in their axial position by clamping rings which can be reduced in size radially, for example by means of air pressure. The inner bearing sleeve is thereby fixed and the rigidity of the bearing increased.

The invention discloses a combined large-span orthogonal truss roof structure supported by four corners of a double-arch three-dimensional truss on the ground. The combined large-span orthogonal truss roof structure comprises the double-arch three-dimensional truss on the ground, an orthogonal plane arc-shaped truss, roof connecting steel beams, large-opening boundary arc-shaped arched beams, two-side single-layer latticed shells and small-opening boundary structures. The double-arch three-dimensional truss on the ground is composed of two inclined vertical face arc-shaped inverted triangular three-dimensional arch trusses. The orthogonal plane arc-shaped truss is composed of multiple orthogonal plane arc-shaped trusses. The roof connecting steel beams comprise the upper chord steel beams and the lower chord steel beams. The large-opening boundary arc-shaped arched beams are composed of two inclined vertical face arc-shaped arched beams. The two-side single-layer latticed shells comprise radial main inclined rods and annular auxiliary rods. The small-opening boundary structures comprise main arc-shaped arches on the ground, longitudinal connecting rods and inclined connecting rods. Based on an overall stress system formed by combining the double-arch three-dimensional truss on the ground and the orthogonal plane arc-shaped truss, component forming modules are clear, force transmission is clear, and the combined large-span orthogonal truss roof structure has the advantages of being large in two-way span space, provided with arc-shaped curved faces and high in bearing capacity.

The invention relates to a hydrodynamic bearing having a shaft, a bearing sleeve that encloses the shaft with a short radial spacing forming a concentric bearing gap, and an equalizing volume that is disposed between an outer circumference of the bearing sleeve and a covering cap at least partly overlapping the bearing sleeve and firmly fixed with respect to the bearing sleeve and connected to the bearing gap via at least one connecting channel or gap, a bearing fluid filling the bearing gap and the connecting channel/gap fully and the equalizing volume at least partially and the bearing fluid forming a continuous fluid film between the bearing gap and the equalizing volume.

The invention relates to a friction lever driving air static pressure guide rail, belongs to the technical field of machine tool equipment units and components, and has the benefits as follows: 1, an upper cross beam and a lower cross beam are adopted for forming a double-cross beam structure, so that the rectangular air static pressure guide rail is high in motion accuracy, frictionless, free from pollution; a back pressure structural design is adopted, an aerostatic guide rail mover is utilized to be arranged on the lower cross beam in a sleeving manner, so that an aerostatic back pressure area is formed between the upper surface of the aerostatic guide rail mover and the upper cross beam, and the load-bearing rigidity of the aerostatic guide rail is improved; besides, with the adoption of the friction lever driving structure, the advantages of high precision, micro-feeding and no transmission clearance are achieved, and the friction lever driving air static pressure guide rail is more economic and practical compared with the driving method adopting a linear motor or ball screw; 2, the aerostatic guide rail mover of the air static pressure guide rail adopts a porous restriction material, thereby being high in rigidity, high in the load-bearing capacity and high in precision, and capable of ensuring a good sliding effect while meeting the back pressure requirements; 3, by adopting a pre-tightening mechanism comprising a puller bolt and a preloaded spring for pre-tightening a pre-tightening friction wheel, the operation is convenient, the pre-tightening effect is good, and the stepless regulation on the pre-tightening force can be realized.

A bearing unit, for supporting a pinion shaft having at one side a pinion head, includes a taper roller bearing and an angular ball bearing, the bearings having a common outer race ring and separate inner race rings. The inner race rings are spaced apart a distance along the pinion shaft, and the taper roller bearing has a contact angle α from 15° to 20° for absorbing mainly the radial force component of the tooth force at the pinion head, and the one-row angular ball bearing has a contact angle β of between 35° and 45° for absorbing mainly the axial force coming from the gear mesh and that induced by the taper roller bearing.

The invention discloses a dual-axis tracking multiple Fresnel lens integrated solar concentrating heat collection system. The system comprises a condenser, a dual-axis tracking platform, a heat absorber and a tracking controller, wherein the condenser comprises a fixing frame, a plurality of Fresnel lenses and reflector elements. The Fresnel lenses and the heat absorber are fixed on the fixing frame; the Fresnel lenses directly face the sun; one reflector element is arranged below each Fresnel lens; the reflector elements are capable of reflecting sunlight focused by the Fresnel lenses to theheat absorber; the fixing frame is fixedly arranged on the dual-axis tracking platform; and a dual-axis tracker of the dual-axis tracking platform is connected with the tracking controller. The systemis simple in structure, low in cost and good in bearing rigidity; the application of small area of the Fresnel lenses to the high-power solar concentrating heat collection system is achieved; and moreover, dual-axis tracking of the condenser is achieved by adopting parallel connected link mechanisms, so that the manufacturing and installation cost of the solar concentrating heat collection systemis further reduced.

The invention relates to a moving frame type unbalanced load resisting hydraulic cylinder. The moving frame type unbalanced load resisting hydraulic cylinder comprises a hydraulic cylinder body composed of a cylinder cover, a cylinder barrel, a cylinder head and a piston. The moving frame type unbalanced load resisting hydraulic cylinder further comprises multiple side branch piston devices arranged on the outer side of the cylinder barrel and used for preventing unbalanced load. Each side branch piston device comprises a side branch barrel, a side branch piston which moves in a reciprocatingmanner along with the piston in the side branch barrel and a connection frame connected with the side branch piston and the outer end of the piston. Compared with the prior art, the moving frame typeunbalanced load resisting hydraulic cylinder has the advantages of assisting in bearing unbalanced load, effectively improving bearing rigidity, reducing friction at the piston and the like.

A system is provided that increases the spindle stiffness of a disk drive while optimizing power consumption. A multipurpose bearing provides axial stiffness and enhanced stiffness against radial and pitch loads applied to the spindle. When used in combination with a journal bearing, conventional thrust bearings may be eliminated without sacrificing overall stiffness. As a result, the height of the disk drive may be reduced, thereby making the system desirable to be used in smaller electronic devices.

A bearing arrangement for a wind turbine is provided, including a bed frame, a support structure mounted to the bed frame, a shaft, bearings supporting the shaft rotatably around a shaft axis, and bearing housings supporting one of the bearings respectively, wherein the bearing housings are mounted on opposite faces of the support structure, the faces facing in the axial direction with respect to the shaft axis. The bearing arrangement provides high bending stiffness. At the same time, the bearings in the bearings housings are easily accessible for maintenance, for example.

In the methods for monitoring a bearing clearance of a roller bearing (4), in particular the bearing clearance of a main bearing of a wind turbine, within the scope of a first measuring series using at least one distance sensor (18), a distance (a, a₁, a₂) between a rotating part (12) and a stationary part (14) is respectively sensed in at least two different recurring load states (L1, L2), and a difference (Δa) between the measured distances (a₁, a₂) is determined. At a later time the distance measurements are repeated in the same at least two recurring load states (L1, L2) within the scope of a second measuring series. A change in the bearing clearance is inferred on the basis of the changes in the distance difference (Δa) within the scope of condition monitoring.