11results about How to "Improve dynamics" patented technology

The invention provides a pure rolling gear and rack mechanism based on a cosine tooth profile and a parabola tooth trace, and relates to the technical field of gear rotation, the pure rolling gear and rack mechanism comprises a gear and a rack, the end face tooth profiles of the gear and the rack are composed of end face working tooth profile curves and tooth root transition curves, and the end face tooth profiles of the gear and the rack are both symmetrical on the left side and the right side; end face working tooth profile curves of the gear and the rack are cosine curves; the tooth surfaces of the gear and the rack have parabolic tooth trace structures; at least one pair of gear tooth meshing points of the gear and the rack are located at nodes to achieve pure rolling meshing contact, and meshing lines formed by moving tracks of the meshing points of the gear and the rack form two contact lines on the tooth surfaces of the gear and the rack respectively. The gear rack has the beneficial effects that the gear rack adopts symmetrical tooth lines, so that the axial force existing when the gear rack is meshed is eliminated, and the service life of a bearing is prolonged.

The invention provides a pure rolling gear and rack mechanism based on a parabolic function tooth profile hyperbola tooth trace, and relates to the technical field of gear transmission, the mechanism comprises a gear and a rack, the end face tooth profiles of the gear and the rack are composed of end face working tooth profile curves and tooth root transition curves, and the end face tooth profiles of the gear and the rack are both symmetrical on the left side and the right side; end face working tooth profile curves of the gear and the rack are parabolas; the tooth surfaces of the gear and the rack have hyperbolic curve tooth trace structures; at least one pair of gear tooth meshing points of the gear and the rack are located at nodes to achieve pure rolling meshing contact, and meshing lines formed by moving tracks of the meshing points of the gear and the rack form two contact lines on the tooth surfaces of the gear and the rack respectively. The gear rack has the beneficial effects that the gear rack adopts symmetrical tooth lines, so that the axial force existing when the gear rack is meshed is eliminated, and the service life of a bearing is prolonged.

The invention discloses molybdenum cobalt nitride Co3Mo3N and a preparation method thereof, and belongs to the technical field of electrochemical energy. The nano composite material is prepared by taking the nitrogen-containing compound as a nitrogen source and under the protection of nitrogen and other atmospheres in the heat treatment process, so that the synthesis efficiency of the metal nitride is improved, the use of NH3 is avoided, and the preparation process of the material is safer, greener and more efficient. The prepared single-metal nitride or double-metal nitride is used for a positive electrode catalytic material of a lithium carbon dioxide battery and has very good application potential.

The present invention discloses a LiAlH4-based composite hydrogen storage material and a solid-phase preparation method thereof. The method first prepares a lithium aluminum alloy by smelting in an inert atmosphere, then prepares a LiAl alloy by low-temperature freezing ball milling under liquid nitrogen cooling conditions, refines the grains and particle size of the lithium aluminum alloy, and finally obtains a coordinated aluminum-based composite hydrogen storage material by ball milling through a hydrogenation reaction in a hydrogen atmosphere. The present invention adopts a solid-phase preparation method, and can prepare LiAlH4 without using a catalyst, while avoiding the use of an organic solvent, eliminating the subsequent solvent removal process, and directly preparing LiAlH4 without passing through an intermediate phase Li3AlH6. The prepared LiAlH4-based composite hydrogen storage material does not contain Li3AlH6, has a low hydrogen release temperature, and a fast hydrogen release rate, and can realize the large-scale preparation and application of LiAlH4.

The utility model relates to a kind of low additional bending moment welding film disc coupling structure, including axle, and axle both sides are connected by flexible film disc group installation disc;Flexible film disc group includes flexible film disc and adapter disc, adapter disc is connected with axle by transmission bolt and self-locking nut, and adapter disc is connected with installation disc by flexible film disc;Flexible film disc is connected installation disc and adapter disc by vacuum electron beam welding process, and flexible film disc inner circumferential end portion is equipped with flexible inner welding surface.The utility model is connected by welding instead of bolt, effectively reduce the weight of coupling;While by flexible film disc close to installation disc, so that gravity position is close to installation disc end face, additional bending moment to shaft head can be effectively reduced, improve dynamic characteristics, adapt to high speed application.

The present invention discloses an optimized Fc variant and its application, wherein the Fc region variant comprises amino acid mutations at multiple sites compared with the parent Fc, the positions of the mutations are 239th, 330th, 252nd, 254th and 256th, and the amino acid sequence of the Fc region variant is shown in SEQ ID NO: 1. Compared with the parent Fc, the Fc region variant provided by the present invention has enhanced binding to human FcRn and human FcγRⅢa, has stronger ADCC activity and longer in vivo half-life, and has better thermal stability.

The invention provides a tooth trace pure rolling gear rack mechanism based on an elliptic tooth profile combination function, and relates to the technical field of gear transmission, the tooth trace pure rolling gear rack mechanism comprises a gear and a rack, the end face tooth profile of the gear and the rack is composed of an end face working tooth profile curve and a tooth root transition curve, and the end face working tooth profile curve of the gear and the tooth root transition curve is an elliptic function. The tooth surfaces of the gear and the rack have arc tangent function and elliptic function combined tooth line structures, and control points are set for smooth connection; at least one pair of gear tooth meshing points of the gear and the rack are located at nodes to achieve pure rolling meshing contact, and meshing lines formed by moving tracks of the meshing points of the gear and the rack respectively form two combined function contact lines on the tooth surfaces of the gear and the rack. The method has the beneficial effects that two functions are smoothly connected at a specific control point by setting the specific control point to form a combined tooth line, so that the axial force is eliminated, and the service life of the bearing is favorably prolonged.

The present invention provides a pure rolling gear rack mechanism based on a parabolic function tooth profile hyperbolic tooth line, which relates to the field of gear transmission technology, including a gear and a rack, wherein the end face tooth profile of the gear and the rack is composed of an end face working tooth profile curve and a tooth root transition curve, and the end face tooth profiles of the gear and the rack are symmetrical on both sides; the end face working tooth profile curve of the gear and the rack is a parabola; the tooth surface of the gear and the rack has a hyperbolic tooth line structure; at least one pair of gear tooth meshing points of the gear and the rack are located at a node to achieve pure rolling meshing contact, and the meshing lines formed by the moving trajectories of the gear and rack meshing points form two contact lines on the tooth surfaces of the gear and the rack, respectively. Beneficial effects of the present invention: the gear and the rack both use symmetrical tooth lines to eliminate the axial force existing when the gear and the rack are meshing, which is beneficial to improving the service life of the bearing.

The present invention belongs to the technical field of battery materials. The present invention provides a pre-sodiumized positive electrode plate, comprising a high-voltage sodium ion positive electrode slurry, a high-capacity sodium ion positive electrode slurry and a current collector; the thickness of the high-voltage sodium ion positive electrode slurry is 10 to 15% of the sum of the thickness of the high-voltage sodium ion positive electrode slurry and the high-capacity sodium ion positive electrode slurry. In the present invention, due to the effective use of the positive electrode sodium supplementation technology, the irreversible sodium loss of the hard carbon negative electrode is reduced, the kinetic performance of the sodium ion battery is improved, and the polarization is reduced, so that the high-performance sodium ion battery has a first coulomb efficiency of more than 95%, an energy density of more than 150Wh / kg, a cycle life of more than 6000 weeks, the ability to charge and discharge at ‑40°C, and the ability to continuously discharge at a rate of 30C, thereby improving the comprehensive electrochemical performance of the sodium ion battery.

A multi-dimensional heterogeneous structure negative electrode material for a sodium ion battery, the preparation method of which includes: mixing selenium powder and a metal nickel salt and dissolving them in an ethanol solution of citric acid, then adding a hydrazine hydrate solution dropwise and stirring evenly, subjecting the mixed solution to a solvothermal reaction; centrifugally washing the solvothermal reaction product to obtain a bulk metal selenide material; placing the dried metal selenide in a muffle furnace for calcination for a period of time, and rapidly annealing to room temperature to obtain a multi-dimensional NiSe / NiO heterogeneous structure composite material. The present invention can in-situ construct a heterojunction and a metal oxide protective layer by calcining a bulk metal selenide with a multi-dimensional hierarchical structure, and the prepared multi-dimensional heterogeneous structure composite material exhibits excellent rate performance and cycle performance as a negative electrode material for a sodium ion battery.

The invention discloses a preparation method of a high-porosity binder-free Co3Mo3N positive electrode and application of the high-porosity binder-free Co3Mo3N positive electrode in a lithium carbon dioxide battery. Belongs to the technical field of electrochemical energy. According to the invention, a Co3Mo3N material is used as a positive active material, a manufacturing method of a binder-free polar plate is designed and used to prepare the positive plate of the lithium-carbon dioxide battery, and the prepared Co3Mo3N polar plate is used as a positive electrode of the lithium-carbon dioxide battery, so that good battery performance is obtained, charge-discharge voltage polarization is remarkably reduced, and good application potential is achieved. The invention provides design and manufacturing of a Co3Mo3N positive electrode plate which is used for a lithium carbon dioxide battery.