最新刊期
期 6 ， 2015
- 摘要：The metal V-belt type continuously variable transmission（CVT） transfers torque by friction,and there always exists slip between pulleys and belt.This characteristic differs from other stepped transmission.To study the torsional vibration response of CVT drive system at a rapidly changing torque,a mathematic model of CVT driveline according to the experimental data of a certain CVT for friction coefficient of each pulley is built.Then the response of this model under LOW ratio is compared with that of the stepped transmission.The results show that,CVT drive system does not show the typical shuffle phenomenon,but a high-frequency and low-amplitude vibration characteristic,and there is no resonance excited in the system.
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发布时间：2022-10-20 - 摘要：Study the face gear machining method by using the plunge milling processing,according to the face gear slotting processing principle and gear engagement principle,a plunging processing method with multi group envelops processing is proposed.Based on the concept of virtual copying of plunge milling cutter to the gear shaper tool,the rotation relation between the gear shaper cutter tooth surface equation,contour surface equation and cutting tool and the face gear moving coordinate system are deduced,and the spur face-gear is processed through multi group envelops.The mathematical formula of the plug mill copying the of the profile of gear shaper cutter and the based on gear shaper cutter and the machine tool structure are given.According to numerical control manufacturing techniques,the NC code based on face gear machined equation is obtained.It is imported into VERICUT to simulate and process.Through the contrasting between simulation and theoretical tooth surface,the feasibility of the proposed method is proved.The proposed method is a new rough machining method for face gear numerical control plunge milling processing,it has great reference value for face gear manufacturing.
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发布时间：2022-10-20 - 摘要：The rolling bearings are widely used in the aviation transmission because of the low friction coefficient,high load ability and high reliability.It’s of great significance to study the life and contact analysis of the bearing under heavy load and severe lubrication based on the numerical analysis of thermal elastohydrodynamic lubrication（EHL） in point contact.The numerical calculation of isothermal EHL and thermal EHL models in point contact are carried out by adopting compound direct iteration method.The oil film pressure,thickness and temperature are obtained by means of Fortran,Origin and Matlab software.Synthetically considering the effect of load,speed,material and ellipticity parameter on EHL in point contact,the certain theoretical basis for heavy-load aviation transmission system is provided.
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发布时间：2022-10-20 - 摘要：Combining the virtual prototyping technology,finite element analysis techniques and thermal stress analysis theory,virtual prototype model of gear casing is established by UG NX 8.0.The 3-dimensional finite element model of the gear casing is established by using the seamless links of UG and ANSYS Workbench14.5,based on the theory of finite element,thermal-structural coupling analysis is implemented to the finite element model,temperature field distribution and thermal deformation of the gear casing are obtained,and centralized positions of the thermal stress and deformation is determined,and the factors that impact the temperature field distribution and thermal deformation are obtained.Through analyzing the results of the finite element simulation,the model of the heat-structure coupling analysis can provide an important reliable analysis basis for structure design,integrated design and the thermal uniform optimization design of the gearbox that worked in the complex overloaded transmission conditions which generate large amount of heat.
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发布时间：2022-10-20 - 摘要：Aiming at the involute spur gear with logarithmic modification,according to the heat conduction differential equation and the basic equations of thermo-elasticity,the thermal and thermo-elastic fields of involute spur gear at any meshing position are obtained by using the FFT and IFFT programming calculation,the influence of the torque and rotational speed on temperature field and thermal elastic field is discussed.The results show that,the logarithmic modification can reduce the strong thermal at the edges of the gear tooth caused by the edge effect,thus the scuffing resistance,accuracy and thermal fatigue life of gears are improved.The rising of either torque or rotational speed can intensify the temperature field and thermo-elastic field of gear,and the modification amount should be designed in terms of torque in order to avoid the edge effect.
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发布时间：2022-10-20 - 摘要：The solid models of the logarithmic spiral cam mechanism and common cam mechanism are established by using SolidWorks,and the kinematics simulation is carried out.Then,by using the software of ANSYS / LS-DYNA,the dynamics analysis of the two kinds of cam mechanism is carried out,and the variation situation of the maximum stress of cam mechanism and the follower changing with time is obtained.By contrast analysis between the dynamics simulation and the kinematical simulation of logarithmic spiral cam mechanism and common cam mechanism,find that the logarithmic spiral cam mechanism drive is more steady during the operation,and the force variation and the average stress of cam and follower are lower,which indicates that the logarithmic spiral cam mechanism is superior to common cam mechanism,and possessed of popularization and application value.
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发布时间：2022-10-20 - 摘要：At present,there are two different kinds of worm-gear hobs in domestic: outer diameter increment hob and pitch diameter increment hob.The outer diameter increment hob has been eliminated a long time ago in the most of the developed industrial countries because of its short service life.However,the pitch diameter increment hob needs to set mounting tilt angle and manufacturing center distance that differs from nominal center distance during hobbing.And following the hob reshaping that reduces the hob pitch diameters,the tilt angle and manufacturing center distance have to be re-calculated and adjusted.Any incorrectness of those two settings will cause worm-gear tooth surface error.The calculation equations of tilt angle and manufacturing center distance are introduced,the error of worm-gear tooth surface caused by the above incorrectness machining parameters settings are analyzed.Two calculation examples,one for single head worm-gear and another for multi-starts of worm are given readers to reveal the distribution of the worm gear tooth surface error,the basis for correcting the machining tool parameter error is provided.
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发布时间：2022-10-20 - 摘要：In order to increase the reliability and efficiency of the kineto-static analysis of complex planar multi-body system,the corresponding vector bond graph method is proposed.According to the kinematic constraint condition,the vector bond graph model of a gear pair with arbitrary tooth profile of tooth is built.Based on this,the theoretical method to build the planar multi-body systems model with gear pair by vector bond graph is given.For the algebraic difficulties brought by differential causality and nonlinear junction structure in modeling and kineto-static analysis of planar multi-body systems with gear pair,the effective bond graph augment method is proposed.By the corresponding algorithm,the computer aided modeling and kineto-static analysis of planar multi-body system with gear pair on a computer is realized,the validity of this method is illustrated.
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发布时间：2022-10-20 - 摘要：While the hybrid input five-bar mechanism in the process of actual movement,constant velocity motor will generate speed fluctuation,as a result terminal actuator will come out path error.An actual path synthesis method in consideration of hybrid input mechanism dynamics is proposed in order to generate much more accurate path.By means of five times spline functions interpolation method making the ideal path of servo motor second-order continuous,the dynamics model of hybrid input mechanism which in consideration of motor dynamics is given,the calculation of the dynamics model is described,with the input of the servo motor as design variables to reduce the path error of end executor.Example simulation certifies that the path of the proposed method can generate more accurate path.
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发布时间：2022-10-20 - 摘要：The gear mechanism for transforming bidirectional torque into unidirectional torque is the key technology of the gear transmission round-trip piston power machine.By using CAXA（Enterprise Edition）,the simulation,processing and kinematics simulation analysis of the dynamic model are carried out.Through the addendum modification of the engaging-out gear tooth or adding the addendum modification of engaging-in gear tooth,can create a gap does not interfere with the rotation of the gear,prevent gear tooth collision and determine the piston stroke.It is fully meet the requirements of strength and contact ratio of the gear force transforming mechanism.It supports the implementation of the reciprocating piston internal combustion engine on the technically.
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发布时间：2022-10-20 - 摘要：Gear is an important part for mechanical transmission.For the case of bending fatigue fracture of pinion during the transmission,the gear tooth thickness is reassigned by tangential modification.The center distance and transmission ratio unchanged,the pinion root bending stress is reduced and the root bending stress of pinion is increased by the tooth thickness reallocation,leading to bending fatigue life of each gear approximately equal.The finite element modeling of gear is carried out by using APDL language,and the bending stress analysis is carried out at a single tooth top loading and meshing gear.Compared to ordinary gear,the results validate that the gear tooth thickness reassigned by tangential modification is accuracy,and it has guidance instructive to solve tooth broke problem of pinion in engineering.
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发布时间：2022-10-20 -
Research of the Linkage Curve Characteristic Parameter Extracting Method by Using Fourier Descriptor
摘要：The advantages and disadvantages of existing extraction method about planar linkage curve characteristic parameter are analyzed and summarized.On the basis of the property that high-frequency component of the Fourier descriptor can well explain the details,and low-frequency component determines the overall shape of the object boundary,the method by using Fourier descriptor to extract characteristic parameters of the planar linkage curve is proposed,and the numerical atlas database of planar linkage curve characteristic parameter is established.The calculation results show that the low-frequency component of Fourier descriptor can well reproduce the original closed curve through the inverse Fourier transform,and the normalized Fourier descriptor has good robustness,the corresponding numerical atlas database has the advantages of high precision,simple calculation,small redundancy.All of these bring a new thinking way for four-bar linkage curve replay.- 7
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发布时间：2022-10-20 - 摘要：Aiming at the problem of low speed of using numerical methods to solve the Stewart platform position and attitude forward solution and the initial value of improper selection may not obtain the forward solution,the BP neural networks algorithm is used for solving those problems.The experiment and simulation results show that this method is fast and effective.
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发布时间：2022-10-20 - 摘要：According to the principle of face gear dish wheel grinding,by using the theory of instantaneous contact ellipse,the grinding basic parameters are solved,the finite element model of gear grinding temperature field is set up and the gear grinding transient temperature field finite element simulation is carried out.Through the simulation and experimental analysis,the basis for basic parameter optimization,improve the quality of grinding and further research of face gear grinding temperature field is provided.
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发布时间：2022-10-20 - 摘要：A modeling method for manufacture of circular-arc-tooth-trace（CATT） cylindrical gear is proposed by analyzing the generating theory and meshing principle of gear and rack.Based on the secondary development of UG software,the three-dimensional model of CATT cylindrical gear for manufacturing is established.The maximum contact stress of CATT cylindrical gear with different tooth line radius are analyzed under the same condition by using the method of finite element analysis.Reveal The influence of the tooth line radius on the contact line length and the maximum contact stress of CATT cylindrical gear and the influence law curve of the maximum contact stress are obtained,which provides the necessary theoretical basis for the design and engineering application of the CATT cylindrical gear.
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发布时间：2022-10-20 - 摘要：Taking the torus-involute gear as study object,according to the theory of gear meshing and the gear hobbing process,the tooth surface equations of torus-involute gears with convex and concave teeth are derived by using the tooth surface equation of counterpart rack.According to the mathematical conditions of neither undercutting nor tooth pointing,based on MATLAB,the Graphical User Interface which contains geometric parameter designs of torus-involute gear is developed.In the light of the tooth surface equations of torus-involute gear,the three-dimensional coordinates of torus-involute gear are calculated which can be used to develop the3-D solid models.The Hypermesh is used to mesh the 3-D models of torus-involute gear.Based on the nonlinear contact algorithm,the finite element models of convex and concave torus-involute gears meshing are established which can be used to implement the dynamic contact analysis in ABAQUS.The results reveal that the width of torus-involute gears is limited by gear undercutting or tooth pointing and the maximum contact stress will be steady after hobbing for a while.The contact stress is small when just a pair of gear teeth are meshing,while the contact stress is large when two pairs of gear teeth are meshing.
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发布时间：2022-10-20 - 摘要：Automotive transmission system load spectrum is the indispensable data foundation of automotive transmission system designing,testing and evaluating.Aiming at the off-road vehicle transmission system of an enterprise,considering the design,test,analysis other purposes,choosing the measured parameters of torque,speed,gear position,brake pedal station,clutch pedal position,lubricating oil temperature,strain,acceleration signals and etc signals,the complete synchronous test scheme for transmission system load spectrum is constructed.Rounded and accurate measurement of the transmission system load spectrum based on the Pascar test specification provide basic data and important guidance for the design,test,analysis of automotive transmission system.Wireless torque measurement problem and the synchronization problem of different channels are solved and a complete solution scheme of data collection for automotive transmission system is provided.
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发布时间：2022-10-20 - 摘要：Application of chemical deposition technology,a layer of nanometer TiN-Ni alloy is coated in the planet gear shaft of automotive transmission,the tests show that the nano-TiN particle increase the hardness and the wear-resisting performance and the chemical resistance of the plating of TiN-Ni alloy,also increase the friction coefficient for it.The nano-TiN particle is diffused in the unit cell of the layer of nanometer TiN-Ni alloy,they form the plating of metal alloy and ceramic,the plating is densification and hardness,there are a lot of the hardness nano-TiN,the mechanical property of TiN-Ni alloy coating is improved.
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发布时间：2022-10-20 - 摘要：The structure of reducer is complex and diverse forms.In order to meet the requirements of the enterprise on the product rapid design,improving the design efficiency,flexibility in the use of the SolidWorks2012 configuration technology,a parametric design method of reducer box body structure and implementation steps are introduced,not only making the structure design of the reducer box body is more efficient and flexible,but also providing technical support for the parametric design of complex parts.
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发布时间：2022-10-20 - 摘要：The vibration of an urban bus is abnormal during the process of driving,the reason may be that the drive axle is the resonance of drive axle.Through the method of modal test and finite element analysis,the intrinsic mode characteristic of drive axle are obtained,and comparing with the excitation frequency that may caused the drive axle resonance,found that the main reduction gear meshing frequency and the drive axle low order natural frequency are coupling when the engine and transmission in common use.By using finite element method,taking improving the low natural frequency of drive axle as the target,the mass and strength as the constraints condition,the optimization design is conducted.The result is that the improvement of drive axle dynamic characteristic is obviously,the meshing frequency of main reduction gear is effectively avoided.
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发布时间：2022-10-20 - 摘要：Aiming at the brakes open out of sync phenomenon of 210 t converter tilting mechanism in a steel plant,to study the influence of contact-impact on the gear strength under this working condition,the geometry entity model of the reducer is set up in Pro / E,and it is imported into the software of Hyper Mesh to built the finite element solving model,and the solving is carried out by using the explicit dynamics solver LS-DYNA.According to the results,a conclusion can be drawn that the impact stress of the pinion starting later is far less than that of three other pinions,when the gears contact without clearance and brakes open out of sync.At the same time,the result verifies the conclusion that the gear contact impact stress increases with increasing of the velocity difference between the gears and the maximum impact stress of gear occurs in tooth root in the middle of tooth width.
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发布时间：2022-10-20 - 摘要：To reduce the energy consumption of heavy duty construction vehicle pollution,and improve the capacity of the complex conditions of the vehicle,the multi-metal complex with stepless transmission and front / rear axle torque distribution device in the traditional drive system are imported,a new mathematical model of heavy duty four-wheel heavy duty construction vehicle is established,finally,a four-wheel drive heavy duty construction vehicle traction integrated control strategy is obtained.The results show that large ratio change conditions required for the engine reaches maximum speed of the longest and highest speed reached a minimum;small ratio change conditions can achieve high speed,the speed curve more smooth and steady acceleration phase speed change under the conditions of large ratio rate change;after the introduction of traction control system,slip phenomenon can be well suppressed over a driving wheel,the drive wheel speed control range of the space in the target vehicle speed.
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发布时间：2022-10-20 - 摘要：Taking two-stage planetary gear of the cutting part of MG900 /2215-GWD shearer as study object,the dynamics analysis simulation of it is carried out by using virtual prototype technology.By comparing the meshing force curves in time domain and frequency domain of the health and several broken tooth fault of varying degrees,the dynamic response of two-stage planetary gear system under fault condition is analyzed.It can be found that under fault condition,the mesh force side bands of energy become intensive,and the intensity increases with the extent of the damage increase.The research results can provide a theoretical basis for two-stage planetary gear fault diagnosis and testing.
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发布时间：2022-10-20 - 摘要：According to the distribution characteristics and the inspection requirements of 500 k V super-high voltage transmission line,the mechanical structure of a new inspection robot with four arms is introduced.Based on this,the kinematical simulation and kinematic analysis of the obstacle-navigation process are conducted by using ADAMS.Through the repeated scene simulation experiments,it is verified that the robot not only can stably span the four splitting interval rods,suspension clamps and shockproof hammers and other obstacles,but also can span these obstacles with high efficiency and has the strong climbing ability.
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发布时间：2022-10-20 - 摘要：The contact stress and bending stress are calculated and comparatively analyzed with the same meshing tooth width by using three methods of the national standard formula based,Romax software（full tooth meshing） and Romax software（staggering tooth meshing）,and thus the effects of different meshing tooth width（that is different staggering tooth amount） on the gear bending stress values are researched.While by using Locati rapid fatigue testing methods,the operating gear bending fatigue tests are carried out and the bending stress of each load with three methods are determined,the bending fatigue limit estimated values are obtained.By comparing the bending fatigue limit estimated value,the bending stress credibility of staggering tooth meshing is determined based on Romax software（staggering tooth meshing）,the reference method for the gear bending stresses calculated with staggering tooth meshing is provided.
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发布时间：2022-10-20 - 摘要：Taking the wind power speed-increasing gearbox of load distribution type with two-stage planetary one-stage parallel axis as study object,considering the meshing stiffness,supporting stiffness and torsional coupling stiffness of the planetary gear mechanism and parallel shaft gear at low speed stage,medium speed stage and high speed stage,the dynamics model with considering the radial direction deviation and torsion deviation is established.The inherent characteristic of the model is analyzed,the vibration mode is divided into displacement vibration modal and torsional vibration modal and the vibration characteristics of each modal are obtained.Through changing the numerical size at all stages torsion coupling stiffness,the influence law of torsional coupling stiffness numerical variation on the coupling vibration state between low speed stage and medium speed stage,and medium speed stage and high speed stage is obtained.Through changing the connection types of all stages,the gear at all stages running at the coupling vibration condition can be decreased or avoided.
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发布时间：2022-10-20 - 摘要：A new type of motor drive wheel traction device is proposed,the structure and principle of the traction device is elaborated.The parameter calculation model is established to calculate the relevant parameters and analyze the obstacle-surmounting ability of traction device.The changes relationship of each parameter is verified and calculated.The traction device is desirable in stability and meshing of actuator and flexible in control of the tractor.The stability,carrying capacity and wellbore adaptability of the tractor in down-hole driver are improved.In addition,it can be enhance the flexible bending adaptability and over-obstacle capacity of tractor in down-hole operation.It can be provides a new idea for designing and development of down-hole traction device in the oil and gas well areas.
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发布时间：2022-10-20 - 摘要：The shape of the belt is always decided by the different meshing conditions of flexible synchronous belt and pulley in complete and incomplete meshing zone.According to the characteristic of double helical tooth synchronous belt,the mesh form of the double helical tooth synchronous belt and pulley at different meshing zone is studied.By using the dimensional differential geometry,the digital design space geometry model of the tooth of synchronous belt is built,and for this digital modeling mechanism,the 3D solid model design is carried out,the precision model supports for the mould digital design and dynamics analysis of synchronous belt drive system are provided.
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发布时间：2022-10-20 - 摘要：The working principle of magneto-rheological fluids transmission device（MRFTD） is introduced,and the mechanical structure and heat radiation system are designed based on the magneto-rheological Bingham model.The magnetic circuit design and magnetic field simulation are carried out based on finite element analysis software Ansoft Maxwell,thus,the distributions cloud picture of magnetic field under different excitation currents are obtained.The research results that the references and basis for the optimal design of MRFTD are provided.
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发布时间：2022-10-20 - 摘要：Aiming at the problem of the low driving efficiency of bicycle and difficulty to improve transmission ratio,the method of using reciprocating pedal drive method instead of traditional drive is proposed based on the analysis of the driving device and transmission structure of the traditional bicycle,by using planetary gear train placed inside the wheel for speeding up,the bicycle wheel reach high speeds with small size diameter is ensured.This structure device is reasonable and proved by simulated analysis of ADAMS software,and it is new view for small size folding design of bicycle.
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发布时间：2022-10-20 - 摘要：Under the conditions of giving the length of the rocker CD,swinging angle φ and advance-to return-time ratio K（extreme position angle θ）,in order to design crank-rocker mechanism with the maximum value of minimum transmission angle γmin,the supplementary angle β（be used to determine the position angle of the rotation center A of crank） is introduced,the function relation of minimum transmission angle γminand the supplementary angle β is established.Then the maximum value of minimum transmission angle γmincan be obtained by utilizing procedure of Matlab.At the same time,in view of the different K value,the mechanism of type selection is classified.Then,points out the typeⅠ and Ⅱmechanism can be used to design and typeⅠ mechanism is better in force-passing property when K ∈（1,3）.When K∈[3,+ ∞),if type Ⅱ mechanism is used to carry on the design,which will not be able to meet the requirement of the rocker swinging angle,if typeⅠ mechanism is used,which has low efficiency and is not conductive to transmission of the mechanism.
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发布时间：2022-10-20 - 摘要：By using the global analytical method,the magnetic field distribution and electromagnetic torque of the concentric magnetic gear are analyzed and calculated.On this basis,the optimization design is carried out by using the genetic algorithm in optimization toolbox of Matlab（GAOT）.The experiment results show that the optimization design method of the concentric magnetic gear based on Matlab genetic algorithm toolbox is practicable and effective and a new approach for the analysis and design of the concentric magnetic gear is provided.It is significant for the research and application of the concentric magnetic gear.
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发布时间：2022-10-20 - 摘要：The force testing central support is an important part of the model supporting system in a transonic & supersonic wind tunnel,the performance of which is qualified or not would directly affect the control of model attitude angel during wind tunnel tests.First,aiming at the problem that the roll angle backlash is oversized during force tests,the self-locking dual lead cylindrical worm transmission is applied to the force testing central support to solve this problem.Meanwhile,considering that the aerodynamic load is heavy,the slider and the bulging joining sleeve are both used to share the load.Then,the static structural strength of the worm transmission are checked,and at the same time,the finite element analysis is carried out to study the stress and deformation both in the sustaining body and the chief axis.Finally,the calibration model tests for the new force testing central support in comparison with the former one are conducted.Results indicate that the structural design is reasonable,the data presented a good correlation,and the design of the new force testing support is successful for wind tunnel tests.
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发布时间：2022-10-20 - 摘要：A typical six-bar mechanism for baby bed is designed based on ergonomics,and which is optimized by integrated use the software of Matlab and ADAMS.Under the condition of the six-bar mechanism satisfy the constraints,the equation set for solving the connecting rod minimum length and is built and the connecting rod minimum size is calculated by Matlab.The length of connecting rod is set as a variable,and the parametric model of six-bar mechanism is built by using the software of ADAMS.The kinematics analysis and dynamics analysis of the mechanism are carried out,and the acceleration curve of the corresponding point and the force curve of the connecting rod are drawn out.Combining with the data of ergonomics,the optimal length of connecting rod,the length of active rod and crank speed are designed.The research conclusion have practical instructional significance for enhancing the function and comfortable of the baby bed.
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发布时间：2022-10-20 - 摘要：In order to solve the problems of high energy consumption and poor fuel economy of traditional ship in sailing process,a new type of ship drive system layout scheme,namely introducing continuously variable transmission system between the engine and gearbox device of ship is presented.Then work principle of the new ship continuously variable transmission system is introduced and the mathematical model is established.Finally,according to the actual cycle condition to verify the design.The simulation results show that the layout scheme of new type of marine ship power system based on continuously variable transmission system and the way of realization has certain feasibility,the design can make the actual transfer dynamics parameter and the theory of demand values tend to be consistent,the better to achieve the purpose of energy saving.
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发布时间：2022-10-20 - 摘要：According to the problem of the gearbox loading test rig can’t be automatically adjust,a method of three-dimensional adjustable structure improvement based on the cordwood is proposed,and the semi-automatic docking of different types of gearbox test is realized.At the same time,based on the NI 9232 dynamic signal acquisition module and using LabVIEW programming,the detection,data processing and related data storage of vibration signal in the gearbox running process are realized.Combining with the Modbus communication protocol based on LabVIEW,the programming of the control system of the loading test rig is carried out.
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发布时间：2022-10-20 - 摘要：The structure and function of the existing gear generating instrument are analyzed,its drawbacks and deficiencies of the structure and using are pointed out.The traditional structure mode of gear generating instrument is abandoned,and a new type of duplicate planetary transmission of involute gear generating instrument is designed,and then the structure,parameters,principle and characteristics are introduced.The duplicate planetary transmission of involute gear generating instrument is more convenient and quicker for operating by contrast of using the old and new gear generating instrument,and it can completely replace the existing gear generating instrument.
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发布时间：2022-10-20 - 摘要：The Jacobian matrix of a 6 DOF serial and parallel mechanism is established.At the bottom of mechanism is based on Delta mechanism,the top of mechanism is a spherical 2 DOF five bars and a independent 1 DOF rotating composite mechanism.The three dexterity index is analyzed,and the comprehensive dexterity index is defined.According to the requirements of different application can be different weights in the mechanism of three kinds of dexterity index,and the variation in its working space is analyzed,and it is simulated with MATLAB,the results can be applied to the machine mechanism optimization synthesis and trajectory planning.
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发布时间：2022-10-20 - 摘要：The malfunction detection cylindrical gear reducer used in axial flow fan of direct air cooled system and the calculation analysis of the reducer key part containing gear,shaft and bearing are carried out.The result display that gear strength low and excessive shaft bending brings the problem of the tooth surface load maldistribution and additional dynamic load,bearing life low and so on.According to current problem,the technical improve proposition is suggested.
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发布时间：2022-10-20 - 摘要：In order to solve the problems of traditional braking efficiency decrease,higher heat under the working condition of high speed,heavy duty,a novel electric-pneumatic wet brake system is established,the theoretical modeling of new brake system is established by numerical modeling method,the change rules of braking characteristic of the composite brake system are studied,Finally,the scheme is verified through the experiment.
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发布时间：2022-10-20 - 摘要：Taking the 200 k W power-shift engineering vehicle gearbox as research object,the general analysis of the gearbox is carried out.The simulation models of hydraulic control system and dynamic test of gearbox are constructed by utilizing AMESim software.The hydraulic control system performance characteristic curves of gearbox are obtained by applying parameterization to the simulation model.The rationality and stability of the hydraulic controlling system are verified through the performance characteristic curves,some valuable references to optimize control strategy and improve shift quality are provided.
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发布时间：2022-10-20 - 摘要：The Assur rod group method is applied to synthesizes the cam linkage mechanism,including the determination of the cam contours,calculation of curvature radius and pressure angle of cam profile.The synthesis of cam linkage mechanism is obviously simplified by the proposed method.
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发布时间：2022-10-20 - 摘要：According to three failure cases of shaft fracture on the coal belt conveyor reducer,the fracture surface is analyzed and the finite elements calculation method is used to found the shaft fracture causes.The complex fracture formation and features and its effect on the shaft strength are demonstrated,meanwhile,points for attention when using square keyway are proposed.
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发布时间：2022-10-20 - 摘要：The manufacturing status and existing problems of spiral bevel gears used in automotive drive axle of China is analyzed.As one of the largest manufacturing and consuming countries for such gears,manufacturing industry of spiral bevel gears in China is faced with the difficulties of poor production ability for high-level products,as well as low profit for mid-level and low-level products.Taking current manufacturing technologies and processes into consideration,the developmental trend of manufacturing processes suitable for domestic industry is analyzed and summarized from the following three aspects,detailed design of adjusting parameters,network-based closed loop manufacturing technology and near / net shaped precision forging,which would be the prospect for national manufacturing industry of spiral bevel gears used in automotive drive axle.
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发布时间：2022-10-20 - 摘要：The automatic transmission technology is the key technology of tractor transmission system control,is also an effective way to improve the efficiency of the tractor working.The application status at home and abroad is summarized,and the deeply analysis of transmission system,hydraulic system,control strategy,shift quality control technology of power shift transmission and continuously variable transmission which widespread use on the foreign large and medium power tractors at present are carried out.The development and research direction of automatic control technique of transmission on tractor is forecasted based on the development trend of transmission gearshift control.
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- 591
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发布时间：2022-10-20 - 摘要：The dual clutch transmission（DCT） as a kind of new automatic transmission,which integrates the high efficiency of manual transmission and the power gear shift of automatic transmission,and it has become the hot point in the field of world transmission technology.The development history and current situation of DCT are introduced,the structure and operational principle are described in detail as well,and the launching and shifting technology of DCT vehicle are emphatically analyzed.At the same time,forecast the prospect of its development.
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- 514
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发布时间：2022-10-20 - 摘要：<正>2015中国国际齿轮产业技术大会（CIGTC2015）将于2015年10月26—28日在上海新国际博览中心召开,欢迎海内外从事齿轮产业技术研究的专家、学者、企业家及工程技术人员踊跃投稿并参加会议。大会的主要目的是展示齿轮传动及相关领域
- 3
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- 15
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发布时间：2022-10-20
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