291results about How to "Achieve lightweight design" patented technology

The invention discloses a bogie of a high-speed motor train unit. By adopting a brand-new bogie structure and a hanging connection and traction mode, overall lightweight design is realized, the unsprung weight of the bogie is reduced, and the hanging parameter between the bogie and a body is optimized. On the basis that the high-speed running speed is met, stability when the bogie passes through a big corner and good traction and braking performance are expected. The bogie comprises a framework, two groups of wheel set travelling devices, a linear motor, a first hanging device, a second hanging device, a traction device and a foundation brake device. The framework comprises a pair of side beam assemblies and a pair of cross beam assemblies which are connected with each other; each side beam assembly has a hollow box body structure, and comprises a pair of upper and lower cover plates and a pair of lateral web plates which are welded; each cross beam assembly comprises a pair of hollow steel pipes penetrating the lateral web plates and welded with the lateral web plates; and a pair of air spring supporting beams is welded at two ends of a steel pipe and outside the lateral web plates.

The invention discloses a high-strength hot rolled steel plate with yield strength being 700MPa. The steel plate comprises the following chemical components by weight: 0.04-0.08% of C, 0.15-0.3% of Si, 1.20-1.90% of Mn, 0.020-0.060% of Al, not more than 0.015% of P, not more than 0.0009% of S, 0.06-0.08% of Nb, 0.09-0.12% of Ti, 0.0008-0.005% of B, not more than 0.002% of O and not more than 0.004% of N. A preparation method is characterized in that the heating temperature is 1240-1260 DEG C; the rough rolling temperature is 1230-1100 DEG C; the finish rolling inlet temperature is 1080-1040 DEG C; the final rolling temperature is 820-860 DEG C; the total finish rolling reduction ratio is not less than 85%; the laminar flow is cooled at a speed being not less than 60 DEG C / s after finish rolling; and the coiling temperature is controlled between 550 DEG C and 600 DEG C.

The invention provides a designing method of a customized pelvis embedded prosthesis based on topological structural optimization. A designed prosthesis comprises two parts, namely a topological solidstructural part used for ensuring the strength of the prosthesis and a porous structural part used for maintaining an anatomic form, the topological solid part is a primary load bearing part, the strength of the prosthesis can be ensured and light weight can be achieved by using the the topological structural optimization method to design the topological solid structural part, and the porous structural part can maintain the anatomic form of a bone defect part and facilitate the growing of bone and the adhering of soft tissues to ensure the long-term stability of the prosthesis. The prosthesisdesigned by means of the method has the advantages of light weight, anatomic maintenance and good long-term stability, and therefore original functions of a reconstructed pelvis can be maintained tothe maximum extent to improve the life quality of a patient.

The invention discloses an SLM process based part lightweight design processing method. The method comprises the following steps: establishing a finite element model through a three-dimensional digital model of a part, and defining load and boundary conditions; establishing a part topological optimization model and setting a topological optimization unidirectional withdrawal constraint; performing part topological optimization to generate an initial lightweight model, performing mechanical performance analysis on the initial lightweight model, arranging self-supported porous structures with different densities according to stress distribution of the initial lightweight model, and generating a final lightweight model; and processing a final lightweight entity part through an SLM forming technology by utilizing the generated final lightweight model. The unidirectional withdrawal constraint is set in a specified direction during the topological optimization process, and the part topological optimization is finished, so that the part lightweight design is realized; a withdrawal constraint based topological optimization result is suitable for an SLM process, so that a supporting structure does not need to be added, a complicated support removal process is not required, and the design process is simplified; and the self-supported porous structures with different densities are introduced, so that the weight of the structure is further reduced.

The invention provides a metal diaphragm storage box made of carbon-fiber composite materials and a manufacturing method thereof. The metal diaphragm storage box comprises a liner 1 and a metal diaphragm 2 and also comprises an insulating layer 3 and a carbon-fiber composite material layer 4, wherein the liner 1 comprises an upper flange 11, an upper hemisphere 12, a connecting ring 13, a lower hemisphere 14 and a lower flange 15; the upper hemisphere 12 and the lower hemisphere 14 are connected by the connecting ring 13; the upper flange 11 is connected with the upper hemisphere 12; the lower flange 15 is connected with the lower hemisphere 14; the metal diaphragm 2 is butted with the connecting ring 13; the outer surface of the liner 1 is coated with the insulating layer 3; the outer surface of the insulating layer 3 is wound with the carbon-fiber composite material layer 4, and is connected with the carbon-fiber composite material layer 4 in a bonding manner. The metal diaphragm storage box provided by the invention has the advantages that the problems of large weight and low structure efficiency of the metal diaphragm storage box are solved, the light-weight design of the metal diaphragm storage box is realized, the cost is reduced and the performance of a product is improved.

The invention relates to an unfoldable reflecting mirror body based on a double-curvature negative poisson ratio chiral honeycomb structure. The unfoldable reflecting mirror body consists of a laying layer and a double-curvature negative poisson ratio chiral honeycomb structural layer; and the structural layer has a paraboloid shape, and the internal surface of the structural layer is the laying layer. The structural layer is made from shape memory polymer materials, and the laying layer is made from metal materials and carborundum or carborundum-based composite materials. The unfoldable reflecting mirror body is used for solving the problems that an aerospace reflecting mirror cannot meet the use requirement on the high ratio of the unfolded volume to the contraction volume, and has low light weight degree, a small caliber and a complicated control system. The unfoldable reflecting mirror body has the functions of obtaining a higher ratio of the unfolded volume to the contraction volume, and repeated folding and unfolding for a plurality of times, can be unfolded at one time, and has a simple structure, high light weight degree, high system reliability and strong stability.

The invention relates to a phase-change energy storage device lattice interlayer structure based on additive manufacturing, and belongs to the technical field of spacecraft lightweight multifunctionalstructures. The interlayer structure is an integrated structure prepared through an additive manufacturing technology, a shell is arranged on the exterior, the interior is designed to be a three-dimensional network structure, lightweight design of a phase-change energy storage device is achieved, and the weight is decreased by 60% or above compared with a traditional structure; and the three-dimensional network structure is formed through translation of two repetitive units including a sparse lattice cell unit with a specific structure and a compact lattice cell unit with a specific structurein the space, and therefore the condition that the top of the phase-change energy storage device generates structural collapse can be avoided. According to the phase-change energy storage device lattice interlayer structure based on additive manufacturing, integrated forming is conducted through the additive manufacturing technology, the strength problem caused by welding does not exist, and thestructure has the excellent mechanical property; in addition, the preparation technology has the advantages of being high in manufacturing precision and short in period, the manufacturing efficiency is greatly improved, and the structure has a good application prospect on the phase-change energy storage device structure design aspect in the fields of spaceflight, aviation, energy sources, preciseinstruments and the like.

The invention relates to a CAE (Computer Aided Engineering) analysis based product structure optimization method and system. The CAE analysis based product structure optimization method comprises step 1, establishing a finite element mesh model of a product structure before optimization through an application module which is arranged in a computer system and receiving material parameters of the structure; step 2, receiving boundary conditions and loads of the modal analysis under the static analysis and of constraint condition, wherein the boundary conditions and loads are defined based on the working conditions under two working states, loading the finite element mesh model and obtaining a response result through calculation; step 3, establishing a design space and an off-design space according to the response result; step 4, receiving topology optimization parameters which are defined according to the design space, the off-design space, structural loads and the response result, establishing a topology optimization model, completing the optimization analysis and obtaining an optimization result; step 5, reestablishing the finite element mesh model according to the optimization result, performing loading in the way as same as that in the step 2 and obtaining a response result of the product structure after optimization through calculation. According to the CAE analysis based product structure optimization method and system, the performance requirements are met and meanwhile the lightweight design is implemented.

The invention provides a variable-thickness automobile front bumper and a manufacturing method thereof. The automobile front bumper comprises a front bumper body which is of a thin-wall structure. The front bumper body sequentially comprises a left body section, a left transition section, a right body section, a right transition section and a right body section. A left energy absorption box and a right energy absorption box are arranged on the inner side faces of the left body section and the right body section of the front bumper body respectively, so that the front bumper body is connected with an automobile front longitudinal beam. The left body section and the right body section are of a uniform-thickness structure. The left transition section and the right transition section are of a continuous variable-thickness structure and become thinner gradually from the two ends to the middle body section. The middle body section is of a uniform-thickness structure and is the thinnest portion of the whole front bumper body. According to the variable-thickness automobile front bumper, by means of the design of parts of different thicknesses, the requirement for collision safety of the automobile front bumper is met, and the design of light parts can be achieved at the same time.

A combined type battery frame assembly of an electric automobile comprises two side battery frames radially fixed to the outer sides of a left longitudinal beam and a right longitudinal beam of an automobile frame and a middle battery frame fixed between the left longitudinal beam and the right longitudinal beam of the automobile frame. A supporting frame used for fixing and connecting the middle battery frame and the side battery frames is further arranged between the middle battery frame and the two side battery frames. The battery frame assembly has the advantages that the layout is reasonable, the number of contained battery packs is large, the structure is simple, the manufacturing and maintaining cost is low, the weight is small, the structural stability is good, and bearing capacity is high; and the battery frame assembly has prominent practicability.

The invention provides a light multifunctional lattice structure. The lattice structure is designed as follows: according to lattice structure units, the filling side length L and the filling diametera are determined, lattice center struts with the side length being L and the diameter being a are completed, four inclined struts are latticed according to the design that the included angle betweenthe inclined struts and the bottom face is 53.5 degrees, the inclined struts are 1.732 L long, the diameter of the inclined struts is a, and the spatial positions of the inclined struts are body diagonals of tetrahedrons with the side length being L, ;2, the lattice structure units are filled, and the positions needing filling in a component model are determined according to requirements; fillingof the lattice structure units is carried out in three-dimensional software, and the component model is formed. Compared with the traditional lattice manufacturing and processing technology, procedures are remarkably reduced, lattice structures with any side lengths can be formed, the time and cost for designing and processing molds are saved, the preparation period of products is short, and the processing efficiency is high.

The invention provides a structure optimization design method for an automobile damping board. The structure optimization design method has the advantages that through strain energy overlay analysis and parallel coupling mode design of sound power losses of the damping board and based on light weight option design of cost, performance and the process, the material, the thickness and the arrangement of the damping board are designed, overall shape optimization is conducted on a metal plate and the damping board, and the light weight design of the damping board is achieved on the premise that the NVH performance is achieved.

The invention provides a traction circuit of a dual-power source motor train unit, and belongs to the technical field of a motor train unit traction system. The traction circuit of the dual-power source motor train unit comprises an internal combustion power supply circuit, a traction variable current circuit and an electric power supply circuit, wherein the internal combustion power supply circuit is connected with the first end of the traction variable current circuit; the second end of the traction variable current circuit is connected with the electric power supply circuit; the internal combustion power supply circuit, the traction variable current circuit and the electric power supply circuit are arranged on different train bodies of the dual-power source motor train unit. The traction circuit of the dual-power source motor train unit provided by the invention has the advantage that the switching of a disperse power type motor train unit between an internal combustion power system and an electric power system is realized.

The invention relates to a component distribution method for an automobile seat framework. The component distribution method for the automobile seat framework comprises the steps that a design model is established according to the design request of the seat framework, and a design area is determined; a finite element model of the automobile seat framework is established according to the design area and loading conditions; topological optimization design is conducted on the finite element model with a variable density method, and a material density distribution diagram in the design area is obtained; pipe structural parts of the automobile seat framework are arranged based on the material density distribution diagram. The reasonable material density distribution diagram is obtained by establishing the finite element model for the design area, the pipe structural parts are distributed and arranged based on a material density method, and the purposes that under the premise that the safety of the automobile seat framework is met, the weight of the pipe structural parts is reduced, and the rigidity and the strength of the pipe structural parts are improved are achieved. The lightweight design of the automobile seat framework is achieved, and good economical efficiency can be obtained.

The invention discloses a wireless sensor network data acquisition method and system based on broadcast synchronization, and the method specifically comprises: a host node broadcasting synchronizationheaders to all network sensor nodes, and the network sensor nodes carrying out the calibration of respective sampling timers according to the time calibration information; determining or updating therespective sampling rate according to the query period and the respective sampling rate; according to the time slot distribution information, packaging the sampling data according to a sampling timesequence and sending the sampling data to a host node in a datagram form; and the host node analyzing the content of each datagram, reproducing the data of each network sensor node, and transmitting the data to a comprehensive control computer or a remote measurement system. Whole network management and data collection are realized by adopting the host broadcast message, the method is simple and reliable, the data synchronization precision is high, the data reported in each period are equal in length, the hardware processing is convenient, the sampling rate can be dynamically changed, and theproblems in the prior art are solved.

The invention discloses a method for determining a wind turbine blade structure based on a finite difference method. The structure design by the finite difference method is coincident with the design process of the blade. Pneumatic profile of the blade is designed firstly and then the structural design is carried out on the premise of determining the pneumatic profile so as to ensure the pneumatic efficiency and structural strength of the blade. By using the finite difference method, three-dimensional design is changed into two-dimensional design so as to simplify the design complexity. Due to the adoption of a reverse finite difference method, the deformation control design of the blade is realized. By taking theoretical section flexural rigidity as a design target, the section area is restrained so as to realize the light-weight design of the blade.

The invention discloses a square honeycomb sandwich structure. The smallest mechanical analysis unit of the square honey comb sandwich structure is a first horizontal right-angle side and a first vertical right-angle side which constitute a first right angle and a second horizontal right-angle side and a second vertical right-angle side which constitute a second right angle and are perpendicular to each other, and the two angle sides which are in axial symmetry are connected with each other through adhesion agent. The further expanding structure is that horizontal end points, adjacent to each other from the left to the right, of the smallest mechanical analysis unit are connected, and the upper vertical side end point of the adjacent units from top to the bottom is connected with the lower horizontal side end point. The square honeycomb sandwich structure enables the weight of the sandwich structure to be lighter under the condition that the using requirement of the structure is met, and is more beautiful in shape.

The invention discloses an efficient lightweight speed reducer for a tower crane. The speed reducer comprises a whole box body, an input shaft, a transmission assembly and an output shaft, wherein theinput shaft, the transmission assembly and the output shaft are sequentially engaged for transmission, the end, extending out of the box body, of the output shaft is of a spline structure, a first convex stop opening is preset on a cover plate of the output shaft and is matched with a first concave stop opening of a winding cylinder spline sleeve, and a second convex stop opening is preset on anouter circle shaft of the end, extending out of the box body, of the output shaft, and is matched with a second concave stop opening of the winding cylinder spline sleeve; an oil tank is formed in thebox body, the inner wall of the oil tank forms a first oil collection groove and a first oil way, the first oil way passes through the transmission assembly and / or a bearing of the output shaft, oneend of the first oil way communicates with the first oil collection groove, the other end of the first oil way communicates with an oil tank inner cavity, the box body is connected with a high-speed end bearing pedestal, a second oil collection groove and a second oil way are formed on the high-speed end bearing pedestal, the second oil way passes through an inner cavity of the high-speed end bearing pedestal, one end of the second oil way communicates with the second oil collection groove, and the other end of the second oil way communicates with the oil tank inner cavity.

The invention discloses a side impact energy-absorbing high-rigidity all-aluminum light-weight door sill structure for an automobile. The side impact energy-absorbing high-rigidity all-aluminum light-weight door sill structure comprises a door sill framework and an I-shaped composite beam, wherein the inside of the door sill beam framework is coated with the I-shaped composite beam; foamed aluminum bar columns are separately arranged in an upper profiled groove and a lower profiled groove of the I-shaped composite beam; the door sill framework comprises an outer plate-shell assembly and an inner plate-shell assembly; the door sill framework is formed by folding the outer plate-shell assembly with the inner plate-shell assembly; the inside of the door sill framework is coated with the I-shaped composite beam by the door sill framework; the outer plate-shell assembly comprises a door sill reinforcing plate outer panel and a side wall outer plate; the outside of the door sill reinforcing plate outer panel is coated with the side wall outer plate; the side wall outer plate is provided with an energy-absorbing cavity; a plurality of cylindrical foamed aluminum energy-absorbing components are arranged in the axial direction of the door sill reinforcing plate outer panel at intervals; and the cylindrical foamed aluminum energy-absorbing components are arranged in the energy-absorbing cavity. According to the structure, under the same side impact conditions of the automobile, impact buffer energy absorption, a high-rigidity structure and light weight of an automobile body are simultaneously realized; and in addition, the door sill structure has good pavement noise absorbing capability and facilitates the improvement on driving comfortableness.

The invention discloses an ultra high strength low temperature ductile iron casting for a wind turbine generator and a manufacturing method thereof. The ductile iron casting comprises, by weight, 3.6-3.8% of C, 2.1-2.5% of Si, no more than 0.15% of Mn, no more than 0.027% of P, 0.008-0.014% of S, 0.01-0.10% of V, 0.05-0.40% of Ni, no more than 0.020% of Ti, no more than 0.025% of Cr, 0.035-0.045%of Mg residual, and the balance Fe and unavoidable impurities. The tensile strength of the ductile iron casting Rm is larger than or equal to 400MPa, the yield strength Rp0.2 is larger than or equal to 260MPa and the impact energy alpha k is larger than or equal to 10J at minus 20 DEG C. The proportional relationship of the chemical composition of the ductile iron casting is determined according to CE, Rm and / or alpha k. The ultra high strength low temperature ductile iron casting for the wind turbine generator greatly improves the strength index under the situation of ensuring the low temperature impact energy at minus 20 DEG C.

The invention discloses an efficient horizontal type machining central machine tool with double main shafts and double work tables. Two groups of rotary work tables are arranged on swing arms of the machining central machine tool, a ram on a vertical column of the machine tool is provided with two groups of electric main shafts, and two groups of tool magazines and tool changing mechanical arms are arranged on the two sides of the vertical column. According to the machining central machine tool, two workpieces can be machined at the same time, meanwhile, when tool is changed, the two tool changing mechanical arms can change tools on the electric main shafts at the same time, and the machining efficiency of the machine tool is improved.

The invention discloses a single-shaft rubber wheel light rail vehicle bogie. The bogie comprises a framework, a shaft bridge device and an axle fixing device, the framework comprises a guide frame and a suspension frame, the suspension frame is arranged above the guide frame through at least four elastic elements, and a guide wheel is fixedly arranged on the guide frame; rubber wheels are arranged at the two ends of the axle device, and the axle device is located between the suspension frame and the guide frame. The axle fixing device is used for fixing the axle device on the guide frame; a traction rod is connected between the axle fixing device and the suspension frame, a driving device is further arranged on the suspension frame, and the driving device is used for providing power for the axle device. According to the invention, the lightweight design is favorably realized, the comfort of the vehicle is improved, the structure of the bogie is simplified, and the maintainability is enhanced.

The invention discloses a main speed reducer housing for a light car axle, wherein a step for mounting a bearing is directly cast on the speed reducer housing; the bearing is directly assembled on the speed reducer housing; a driving bevel gear is directly assembled in a bearing hole; a through hole formed in a mounting surface of the speed reducer housing is directly connected with an axle housing; and reinforced ribs are arranged at the corresponding positions of the front bearing and the rear bearing both used for assembling the driving bevel gear, as well as the bearing of a differential gear. The main speed reducer housing for the light car axle effectively improves the engagement precision of the driving bevel gear; as the guide bearing is not adopted to support the driving bevel gear, the space is saved, the space base is provided for the wide tooth surface design of the gear, and the design concept of the high power density of the speed reducer is finally realized; through the reasonable arrangement and the optimized calculation of the supporting ribs, the basic wall thickness of the speed reducer housing can achieve the minimum degree of 4mm without influencing the service life of the gear, and realize the light scale design; and bearing burning and gear early failure are avoided through the verification of the rack and the road experiment, the matched requirements for the whole vehicle are satisfied.

The invention belongs to the field of structural design of an automobile body in white, and particularly relates to a design and optimization method of a variable cross-section beam of the automobile body in white. According to the invention, the restriction of assembly and manufacture of the design of the beam cross-section of the automobile body in white is comprehensively considered; the shape of the beam cross-section is subjected to special coding control; the continuous beam cross-section shape, the scattered material thickness, the material type and the quantity of beam cross-section panels are adopted as design variable; the satisfaction of the requirements on the cross section property, the weight, the cost and the like required by the automobile body rigidity is taken as the design target, so that the cross section optimization meeting the requirement under different optimization restriction conditions is realized, the difficult problem of synchronous optimization of the variable cross-section beam is solved, and the optimization of the variable cross-section beam with multi-layer plates is realized. The invention is beneficial to the provision of a method for designing an initial variable cross-section beam structure for the automobile body, and realizes the optimization design of the variable cross-section beam; the method not only can be applied in the confirmation of a variable cross-section contour line of the beam in the automobile body concept design stage during the forward design process, but also can be used for improving and optimizing the structural performance of the existing beam.

The invention discloses a bidirectional multi-arch large-caliber space reflector, and belongs to the technical field of precision machinery of optical systems. The reflector comprises a reflector surface and a back matrix, wherein open lightweight holes and supporting holes are formed in the back matrix, and the back matrix has a stiffened plate type structure; and grooves are formed in the back matrix, and the back matrix is in a bidirectional multi-arch shape formed by multiple radial arches and multiple annular arches. By adjusting the arrangement of the grooves and changing the mass distribution of the reflector along two directions, the mass of the matrix is lightened under the condition that the stiffness of the structure of the reflector is not reduced, the specific stiffness of the structure is improved, the structure is reasonable, and great lightweight is realized. The specific design examples show that the mass of the reflector can be reduced by 24.5 percent compared with a flat-back reflector. The reflector has the advantages of low self-weight deformation, reasonable stiffness distribution and light mass, and is suitable for a large-caliber space telescope system.

The invention discloses a variable-unit-cell-size opposite-pyramid gradient lattice structure with transition layers. The variable-unit-cell-size opposite-pyramid gradient lattice structure with the transition layers are used for solving the technical problem that an existing gradient lattice structure is poor in mechanical performance. According to the technical scheme, the variable-unit-cell-size opposite-pyramid gradient lattice structure with the transition layers comprises N layers of opposite-pyramid lattice structures and N-1 transition layers, wherein each layer of opposite-pyramid lattice structures are formed by opposite-pyramid lattice unit cells in the xoy plane by means of prolongation, and each transition layer a is connected with an opposite-pyramid lattice layer b and an opposite-pyramid lattice layer c, the unit cell size of each opposite-pyramid lattice layer b is 2L, the unit cell size of each opposite-pyramid lattice layer c is L, and the height of each transition layer a is H. According to the variable-unit-cell-size opposite-pyramid gradient lattice structure with the transition layers, the transition layer is arranged between two layers of different unit cellsizes of opposite-pyramid lattice structures, the sectional dimension of each lattice unit cell rod piece and the lattice unit cell size can be changed at the same time, so that when the structure isdesigned, the influence of the lattice unit cell size and the influence of the sectional dimension of each rod piece on the overall performance of the structure can be taken into consideration at thesame time, and the purpose of improving the mechanical performance is achieved.

The invention discloses a magnetic gear-based power-coupled composite motor and a control method thereof. The composite motor successively comprises, from a side to the other side, a motor I, a magnetic gear I, a magnetic gear II and a motor II, wherein the output shaft of the motor I is connected to the inner rotor of the magnetic gear I; the output shaft of the motor II is connected to the inner rotor of the magnetic gear II; the outer rotor of the magnetic gear I is locked; the intermediate rotor of the magnetic gear I, while being connected to a PTO output shaft, is connected to the outer rotor of the magnetic gear II through a clutch I; the outer rotor of the magnetic gear II can be locked by a clutch II; and the intermediate rotor of the magnetic gear II is connected to a traction output shaft. The dual motors of the present invention can be coupled to each other to realize operation assistance, and can also perform respective operation separately. The composite motor overcomes a defect that each motor in a conventional dual-motor driving system can only perform its own driving task and enhances the system reliability.

The invention discloses a front anti-collision beam, a frame and an automobile with the front anti-collision beam and the frame. The front anti-collision beam comprises a body. The body comprises an upper plate, a lower plate, a first lateral plate, a second lateral plate and a middle plate, wherein the lower plate is arranged below the upper plate; the first lateral plate is connected between the front end of the first lateral plate and the front end of the second lateral plate, the second lateral plate is connected between the rear end of the first lateral plate and the rear end of the second lateral plate, the middle plate is arranged between the upper plate and the lower plate and is respectively connected with the first lateral plate and the second lateral plate, and the thickness of the middle plate, the thickness of the upper plate and the thickness of the lower plate are almost the same. According to the front anti-collision beam, because the upper plate, the middle plate and the lower plate are designed to be of the same-thickness structure, the front anti-collision beam is easier formed by extrusion in a bending mode, and a lightweight design is achieved under the premise that the requirements for collision energy absorption are met.

The invention discloses an electric vehicle transmission. The electric vehicle transmission comprises a transmission shell, a driving motor rotor, a driving motor stator, a sun gear II, a driving motor output shaft and a sun gear I; a shaft extension end of the driving motor rotor is fixedly connected with the driving motor output shaft; the sun gear I sleeves the left end of the driving motor output shaft; a first planet row planet gear is mounted on a planet carrier; a wedged brake I is mounted on the inner wall of the transmission shell, and cooperates with a first planet row planet gear ring; and the sun gear II sleeves the right end of the driving motor output shaft. The electric vehicle transmission has two gears, meets the demands of vehicle acceleration, climbing and the like through reasonable matching of speed ratios, and prolongs the driving range; through integral design of a driving motor and a transmission, a control system is simplified, the number of control elements isreduced, the control difficulty is reduced, and the vehicle NVH performance and the sitting comfort are improved; and through the integral design scheme, the axial size of a power assembly is shortened, and the mounting space is saved.

The invention discloses a main load-bearing structure suitable for a ballistic reentry recovery capsule, and belongs to the technical field of load bearing of a recovery capsule. The main load-bearing structure suitable comprises a head shell, a stabilizing flare, a flare bottom, an instrument panel, a transition bracket, a support base, a platform, a parachute bay device and a pull rod, wherein two ends of the stabilizing flare are respectively butted with the head shell and the flare bottom; the instrument panel is fixed to an upper end frame of the stabilizing flare; the transition bracket is coaxially mounted on the bottom surface of the instrument panel; the platform is connected with the middle bulkhead of the stabilizing flare; the support base is fixed to the upper surface of the platform; the support base is connected with the transition bracket; after a mounting end of the parachute bay device penetrates through the platform, the mounting end is connected with the support base and the transition bracket, and a parachute deployment end is connected with the stabilizing flare through the pull rod after penetrating through the stabilizing flare; a circular gap of the flare bottom is sealed by the spherical surface of the parachute deployment end of the parachute bay device; the structure can bear up under complicated reentry load conditions, meet the requirements of equipment mounting, increase the transversal fundamental frequency of the capsule body, and achieve lightweight design on the premise of satisfying rigidity and strength.