最新刊期
期 11 ， 2020
- 摘要：The tooth surface grid node coordinates are accurately calculated by the tooth surface equation. According to the density requirements of the grid nodes， the grid nodes are evenly divided， the tooth root transition curve mesh is encrypted， and the finite element software is directly imported to generate an accurate finite element model of the spiral bevel gear meshing transmission. Tooth surfaces with different geometric transmission errors are designed， and the loaded tooth contact analysis is performed by using finite element software，and the contact stress and loaded transmission error of gear pairs with different geometric transmission errors are analyzed. Based on the modal superposition method， the vibration response analysis of the spiral bevel gear is used to obtain the vibration displacement， velocity， acceleration. The comparison results show that under the load of 200 N·m， as the geometric transmission error increases， the degree of edge contact decreases， the fluctuation of the upper and lower amplitudes of the loaded transmission error decreases by 44%， and the corresponding vibration displacement， speed and acceleration decrease， effectively reduce deformation and vibration.关键词：Spiral bevel gear;Loaded transmission error;Geometric transmission error;Vibration acceleration;Edge contact
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发布时间：2022-11-10 - 摘要：In order to further tap the fuel saving potential of hybrid heavy-duty trucks， energy management strategy based on dynamic programming is designed. Firstly， the quasi-static vehicle model of hybrid heavy-duty truck is established based on Matlab software platform， and the mathematical model of dynamic programming optimization control is built with the fuel economy taken as the objective function， the state of charge for the batteries taken as the state variable， and the torque distribution proportion coefficient of hybrid system taken as the control variable. Then， based on energy consumption test conditions of heavy-duty hybrid vehicles in China named C-WTVC， the simulation analysis of hybrid heavy-duty truck is carried out. Finally， based on the simulation results of dynamic programming， improved rules are extracted， and the C-WTVC simulation is carried out based on the joint simulation platform of AMESim and Simulink. The simulation results show that， compared with the rule-based energy management strategy， the energy management strategy based on dynamic programming can improve the fuel economy of hybrid heavy-duty trucks by 13.9%， and the control strategy based on improved rules can improve the fuel economy of hybrid heavy-duty trucks by 2.6%， which verifies the effectiveness of the improved rule-based strategy.关键词：Hybrid heavy-duty truck;Dynamic programming;Energy management strategy
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发布时间：2022-11-10 - 摘要：Non-metallic inclusions in the gear have significant influence on the contact fatigue strength of gear. To improve the fatigue performance of the gear， it is essential to understand the mechanism of the influence of the non-metallic inclusions on the fatigue life of the gear. A finite element model of gear pair with inclusions is established， and the Brown-Miller multiaxial fatigue criterion is applied to predict the contact fatigue life. The influence of inclusion size， elasticity modulus， depth and arrangement of inclusions on contact fatigue performance of the gear is investigated. The results show that the size of inclusions increases the stress concentration area， with the increase of elastic modulus difference between inclusion and matrix， the harm of inclusion increases. The damage reaches its maximum when the inclusion located in the depth of about 0.49bH（contact half width depth）. The arrangement angle and spacing of two adjacent inclusions also affect the fatigue relief strength， with the decrease of the distance of the two adjacent inclusions， the stress concentration effect is more obvious， the harm will be greater.关键词：Wind turbine gear;Inclusion;Finite element analysis;Brown-Miller criterion;Life prediction
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发布时间：2022-11-10 - 摘要：The core transmission unit of the star gear drive reducer is a small-tooth-difference multi-tooth meshing gear train， which involves gears with multi-tooth elastic contact meshing， shaft-hole contact， and crankshaft rotation and so on drive relationship， gear motion includes fixed-axis rotation and compound rotation （rotation and translation）.The relationship between mechanics and kinematics is more complicated， and there is no relevant theory in the calculation of strength， deformation and so on. In order to obtain the gear contact strength and bending strength， based on the mechanical theory and computational mechanics simulation methods， under the premise of meeting the requirements of engineering calculation accuracy， a simplified method of the finite element physical model under the complex mechanical behavior of a multi-tooth meshing gear train is explored， and how to deal with simulation problems such as simplification of crankshafts and bearings， meshing of gear teeth， contact convergence， etc. The simulation process is demonstrated by an example. The result shows that， the star gear drive case has the phenomenon of multi-tooth contact elastic meshing， and the number of contact tooth pairs is in line with expectations. The contact stress of the tooth surface and the bending stress of the tooth root are calculated by simulation and can meet the design requirements， it shows that the correctness of the simulation method. Its simulation technology has important guiding significance for the strength calculation and improved design of star gear drive.关键词：Star gear drive;Multi-tooth meshing;Connector
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发布时间：2022-11-10 - 摘要：Aiming at the problem that gear modification is difficult to determine under the influence of multiple factors， the gear modification is optimized based on the polynomial response surface proxy model and particle swarm optimization algorithm. Firstly， considering the influence of the shaft and the bearing， the parametric modeling of the gear transmission device is carried out， and the transmission linear error， the maximum contact stress of the tooth surface and the unit normal load of the gear model are simulated and analyzed to determine gear modification mode for composite modification. Secondly， according to the model parameters and analysis results， the range of each shape modification parameter is determined， the orthogonal test design on the practice parameter is performed， and the test data is fitted to establish a polynomial response surface model. Finally， the particle swarm optimization algorithm is used to optimize the response surface model to obtain the optimal amount of gear modification. The results show that the fitted polynomial response surface proxy model has good accuracy and can accurately simulate the relationship between the gear modification parameters and the maximum contact stress. The optimal modification amount obtained by the particle swarm algorithm is used for gear modification， the maximum contact stress of the gear meshing process is reduced， the transmission error is reduced， and the eccentric load phenomenon is effectively improved.关键词：Composite modification;Orthogonal test method;Polynomial response surface;Particle swarm optimization
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发布时间：2022-11-10 - 摘要：Due to the complex and varied application scenarios of rolling bearings in engineering practice， early rolling bearing failures are easily masked by high-intensity background noise， and traditional fault feature extraction methods are not ideal. Aiming at the rigorous manual selection of the quality factors of the existing resonance sparse decomposition method， a frog leaping algorithm optimization parameter model is proposed， and the quality factors are optimized by the frog leaping algorithm， then the optimal quality factor combination is input into the resonant sparse decomposition model for processing， the low resonance component is obtained， and the low resonance component is subjected to Hilbert demodulation analysis. The maximum kurtosis value of the low resonance component is set as the goal， and iterative optimization of frog leaping is performed to finally identify the fault frequency.关键词：Rolling bearing;Resonance sparse decomposition;Quality factor;Frog leaping algorithm
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发布时间：2022-11-10
Theory·Reserach
- 摘要：In order to solve the problem that it is difficult to complete the full period contact characteristic control of the intersecting cross-axis gear based on the traditional conjugate surfaces meshing theory， a design and analysis method of the intersecting cross-axis gear based on conjugate curves is proposed. In this method， differential geometry and gear kinematics and the conjugate curves meshing theory are applied to deduce the general mathematical model of the conjugate curves intersecting cross-axis gear. The tooth surface curvature analysis and meshing analysis of gear model is carried out and an example is given. The research results have certain guiding significance for the design and manufacture of overload and high-efficiency intersecting cross-axis gear.关键词：Conjugate curve contact;Intersecting cross-axis gear transmission;Mathematical model;Tooth surface curvature analysis;Tooth surface meshing analysis
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发布时间：2022-11-10 - 摘要：The instantaneous meshing efficiency on both sides of the nodes of the gear is calculated respectively. The integral along the length of thread engagement is calculated for the average transmission efficiency expression of gear in meshing process. The expression of the independent variables including active tooth number z1， the transmission ratio i， the friction coefficient f and pressure angle α. The optimized design for the gear parameters of single stage cylindrical gear and two stages cone-cylindrical is carried out respectively. Taking the average efficiency to be the maximum as optimizing object， the penalty function calculation method is adopted. Considering the optimization results， a two stage cone-cylindrical reducer is built and its efficiency is above 94%. The correctness of the parameter optimization design is verified.关键词：Instantaneous meshing efficiency;Single stage cylindrical gear;Two stages cone-cylindrical;Optimal computation
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发布时间：2022-11-10 - 摘要：Aiming at the multi-mode grasping problem of the under-actuated manipulator， an under-actuated manipulator with detachable fingers and composite grasping function is proposed. In order to study the grasping performance of the under-actuated manipulator， a spring-adaptive three-knuckle finger mechanism and a double four-link three-knuckle finger mechanism are developed respectively. Both finger mechanisms use the motion principle of four-link mechanism. The nature of the finger greatly affects the grasp stability of the under-actuated manipulator. The properties of a single finger of an under-actuated manipulator are analyzed， and the influence of the position of the joint contact point and the contact force on the grasp stability is analyzed. A theoretical analysis method of the contact force and moment balance is proposed， and the factors affecting the grasping stability factor are discussed.关键词：Under-actuated manipulator;Finger mechanism;Optimization design;Contact force;Grasping stability
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发布时间：2022-11-10 - 摘要：The knee adaptive rehabilitation apparatus is designed， which consists of a swinging guide linkand a crank slider mechanism.According to ergonomics，the size range of the shank in the adaptive rehabilitation apparatus is determined by analyzing the motion characteristics of human knee joint. In order to realize the adaptive adjustment of the rotation angle of human knee joint， the kinematics model of the mechanism is established based on the complex vector method. According to the kinematics equation，the relation between the knee joint extension angle and the height of the movable frame in the mechanism is obtained， thus the size of the mechanism is determined. Through the simulation analysis and comparison between the adaptive rehabilitation apparatus and the traditional rehabilitation apparatus （crank slider mechanism）， the results show that the motion characteristics of the tandem type rehabilitation apparatus and the traditional rehabilitation apparatus （crank slider mechanism） can meet the stretching angle of the knee rehabilitation apparatus， but the motion stability of tandem type knee joint apparatus is better.关键词：Knee rehabilitation apparatus;Adaptive;Motion stability
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发布时间：2022-11-10 - 摘要：A new type of electro-mechanical brake-by-wire system based on wedge transmission is proposed for driverless vehicle，and the optimal design method of wedge transmission angle is proposed too. The parameters design and three-dimensional modeling of the braking system are carried out，and the joint simulation virtual prototype model is built in Matlab/Simulink and Adams. The simulation results show that the tracking control performance of the new braking system is good. Under the emergency braking condition，the brake coordination time is 0.19 s，the brake unloading time is 0.3 s，the steady state control error is 1.2%. Compared with the national and industrial standards，and traditional hydraulic brake system by wire，the new brake has a large lead in loading and unloading speed，good follow-up performance，and is suitable for the use of the chassis system controlled by wire.关键词：Brake-by-wire;Wedge transmission;Virtual prototype;Simulation analysis;Optimization method
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发布时间：2022-11-10 - 摘要：In order to meet the needs of industrial automation places with narrow installation space， a compact electric actuator is developed by taking NGWN （II） type （3Z） planetary gear mechanism as the main transmission mechanism and combining the fixed axis gear train and worm gear drive. In order to shorten the design cycle and reduce the workload of manual calculation，a multi-objective optimization mathematical model of planetary gear mechanism is established and solved with the volume and efficiency as design objectives， and the design parameters of electric actuator are obtained. On this basis， the three-dimensional model of the electric actuator is established， and finally the manufacturing of the electric actuator is completed. The results show that， for the NGWN （II） type （3Z） planetary gear mechanism with small modulus， when the average value of the reference center distance of all gear pairs or that of two of the gear pairs is taken as the common actual center distance， the calculated profile shift coefficient of each involute gear is more reasonable， and the design result is more in line with the actual requirements.关键词：Electric actuator;Involute planetary gear;Profile shift coefficient;Optimal design;Multi-objective optimization mathematical model
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发布时间：2022-11-10 - 摘要：Bridge-type displacement amplifier is usually used to amplify the output displacement of the piezoelectric ceramic actuator in a micro-displacement positioning system which driven by a piezoelectric ceramic actuator. In order to obtain a higher displacement magnification and solve the problem of parasitic displacement due to poor installation of the bridge-type mechanism， a two-stage displacement amplification based on flexible hinges is designed， which combined a bridge-type mechanism with two symmetrically arranged Scott-Russell mechanisms. The statics model of the mechanism is established based on method of stiffness matrix， the calculation formulas of amplification ratio and stiffness of mechanism are obtained accordingly. The dynamics model and the inherent frequency of the mechanism are established by Lagrange dynamics equation， the finite element simulation method is performed to verify the correctness of models. The results show that the amplification ratio of the combined mechanism is 6.11 and the input stiffness is 12.58 N/μm， the output stiffness is 0.11 N/μm， the natural frequency is 532.52 Hz， which are basically consistent with the theoretical value， and the relative errors are within 10%. The results meet the design requirements.关键词：Amplification mechanism;Flexure hinges;Stiffness matrix;Finite element simulation
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发布时间：2022-11-10 - 摘要：To derive a unified calculation model for gear cross-section area suitable for arbitrary tooth profile. Firstly， based on the external conjugate relation between two identical gear， it is analyzed that cross-section area of gear is composed of pitch circle area， plus conjugated area， and minus minimum top gap area. Secondly， based on the geometric relationship of conjugate profile， the simplest calculation formula without error of the conjugated area and simplified calculating method of minimum top gap area adopts partial hob are given. Finally， example calculation and analysis of gear cross-section area with involute profile are carried out. All results show that the pitch circle area is much larger than conjugated area and minimum top gap area， but calculation method of minimum top gap area determined calculation accuracy of cross-section area， the theory error of gear cross-section area is 0.24%，which could be used in high precision calculation of gear cross-section area. It is concluded that the conjugated area formula is suitable for volume utilization coefficient calculation in arbitrary tooth profile without error for pump.关键词：Gear;Cross-section area of gear;Pitch circle area;Conjugated area;Minimum top gap area;Tooth number
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发布时间：2022-11-10 - 摘要：To assist physically disabled people with impaired upper limb function， a new exoskeleton robot is developed， which named motion assistive robotic-exoskeleton for superior extremity to ease daily upper limb movements and to provide effective rehabilitation therapy to the superior extremity. Firstly， the entire wearable robot is designed and modeled in ergonomics. The D-H coordinates are established by the exoskeleton upper limb kinematics model， and use Lagrange method to analyze its dynamics， and the theoretical driving torque of each joint is solved. The dynamics analysis software Adams is used to simulate the robot. By planning the end and active trajectory and speed settings， the changes of torque， speed and acceleration of each joint are obtained. The correctness of the dynamics model is verified in reverse， and the foundation for further optimization of robot is laid.关键词：Upper limb exoskeleton;Adams simulation;Dynamics;Step function
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发布时间：2022-11-10 - 摘要：In order to overcome the obstacle surmounting ability of ordinary wheel structures on unstructured terrains and the disadvantage of moving speed of leg-type robots on structured terrains， an innovative tensegrity variable diameter walking wheel mechanism is proposed based on the advantages of adaptability， self-stability and flexible mechanism. The basic tensegrity walking unit of the variable diameter wheel is designed after the analysis of two-bar and three-cable plane tensegrity mechanism. The kinematics analysis of the tensegrity variable diameter unit is carried out by using the principle of minimum potential energy， and the parameters of the walking wheel are obtained by Matlab software. On this basis， the wheel hub structure and limited mechanism of the walking wheel are determined through the optimal principle of the stretch-reducing walking wheel and the mechanism model of the tensegrity wheel is established using Catia software. Then， the simulation model using Adams software is built and is applied to simulate the motions of the tensegrity wheel. Thus， the changed rule of the radius of the tensegrity wheel with time is obtained. The stable walking in different terrains can be realized and transformed between wheeled and walking mode by the designed tensegrity variable diameter walking wheel. The validity of the proposed method and the correctness of the theoretical model are verified.关键词：Variable diameter;Walking wheel;Tensegrity;Adaptability;Flexible mechanism
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发布时间：2022-11-10 - 摘要：The efficiency of the electric power steering system with constant ratio of differential gear train power transmission system is low transmission and physical consumption of driver is large when there is no motor power assist. In order to solve the problem， a variable ratio differential gear train power transmission system is proposed. Firstly， the reason of low transfer efficiency of the differential gear train power transmission system is analyzed by the dynamics model， and the system design scheme is put forward. Then a continuously differentiable curve function of variable transmission ratio is designed， and the noncircular gear in the system is designed. Finally， the improved scheme is analyzed by establishing mathematical model， and the physical consumption of driver is calculated. The results show that the physical consumption of driver is reduced by 9.15% after the improved scheme， which proves the rationality and effectiveness of the improved scheme.关键词：Electric power steering system;Differential gear train transmission mechanism;Variable transmission ratio;Noncircular gear
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发布时间：2022-11-10
Design· Calculation
- 摘要：The bearing used to support turbopump works in ultra-low temperature environments， its cage pockets is elliptical usually. Based on the dynamics theory of the rolling bearings， the dynamics differential equations of angular contact ball bearing are established in which the pocket shape of the cage is elliptical. The influences on cage slip ratio and friction power consumption that caused by different working conditions and different structural parameters are investigated. The research show that， as the bearing speed， radial clearance and pocket axial clearance increase， the cage slip ratio increases， as the bearing load， guide clearance and pocket circumferential clearance decrease， the cage slip ratio decreases. As the bearing speed， axial load clearance increase， guide clearance， pocket circumferential clearance and axial clearance increase， friction power consumption increases， as the radial load and radial clearance increase， friction power consumption decreases.关键词：Ultra-low temperature;Cage;Dynamics;Slip ratio;Friction power consumption
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发布时间：2022-11-10 - 摘要：Based on the analysis of the heat generation and heat transfer process of the internal components of an electric vehicle reducer， a thermal network simulation model of an electric vehicle reducer based on AMEsim software is established. It is assumed that under high lubricating conditions， the simulation of heat balance of the reducer under different condition of high-temperature and high-load different vehicle speed is completed. Then the moving particle semi-implicit method （MPS） is used to analyze the agitation flow field of the reduction gearbox at different lubricating oil quantity. Based on this， the convective heat transfer thermal resistance module of the thermal network model of the reducer is modified to obtain optimum oil quantity for reducer. The modified results indicate that under high-temperature and high-load conditions of electric vehicle reducers，a smaller amount of lubricating oil will cause the gears of reducer to be under-lubricated， resulting in higher tooth surface temperatures. Combining the thermal network model with the moving particle semi-implicit method （MPS） provides a new method for the lubrication effect analysis of electric vehicle reducers.关键词：Electric vehicle;Reducer;Thermal balance;Moving particle semi-implicit method
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发布时间：2022-11-10 - 摘要：A parallel mechanism with symmetrical 3TIR （4-PRPaU） is presented. In accordance with the condition of rod length， the model of positional forward solution is established， then it is transformed into an unconstrained optimization problem and solved by differential evolution algorithm. The analytical expression of the inverse solution of mechanism position is derived and the correctness of the forward displacement of mechanism position is verified by using the inverse solution of mechanism position. The vector method is applied to derive the expressions of mechanism velocity and acceleration to give the mechanism scale parameters and number imitation is conducted with Matlab. At the same time， the Adams is used for kinematics simulation. The results show that the Adams motion simulation curve is consistent with the Matlab numerical simulation curve， which verifies the correctness of the theoretical derivation.关键词：Parallel mechanism;Kinematics analysis;Vector method;Adams simulation
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发布时间：2022-11-10 - 摘要：Traditional machine learning methods have disadvantages such as low recognition rate and complicated feature extraction operations in the planetary gearbox fault diagnosis. In order to improve the diagnosis efficiency of planetary gearboxes， a fault diagnosis method based on one-dimensional deep convolutional neural network （1-DCNN） is proposed， and the original signals are directly input to the network for diagnosis. The accuracy of diagnosing five kinds of fault signals of planetary gear of planetary gear box can reach 100%， and the diagnostic accuracy and efficiency are better than other commonly used algorithms.关键词：1-DCNN intelligent diagnosis;Feature extraction;Planetary gearbox
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发布时间：2022-11-10 - 摘要：The unphosphorized and phosphatized spur gears produced in the same batch are divided into three groups，the unphosphorized gear group， the single phosphated gear group and the double phosphated gear group， the scuffing performance test is carried out in groups on the gear contact fatigue tester. At the same time， the helix curve of the test gears detected by the gear measuring center D80 is used to accurately calculate the gluing area and the depth of the gluing groove mark. The results show that， under the same operating conditions， the loading torque of the phosphated gear is much greater than that of the unphosphorized gear， and the operating time of the phosphated gear is much more than that of the unphosphorized gear. It is concluded that， phosphating can significantly improve the anti scuffing performance of gears.关键词：Cylindrical gear;Tooth flank phosphate;Anti scuffing;Contact fatigue tester
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发布时间：2022-11-10 - 摘要：Aiming at the problem of limited fault diagnosis performance caused by a single source of historical operating data for wind turbine bearings and a small amount of data， a small sample fault diagnosis method of bearings based on data generation and transfer learning is proposed. First of all， for the problems of class imbalance and data scarcity in the wind turbine bearing dataset， a data generation method based on a gate mechanism is proposed. The blade-end data coaxial with the drive-end of the bearing is used as a template to generate a sufficient amount of generated data. The data is used as the source dataset. Then， according to the time series correlation of the data and the small sample application scenario， a transfer learning method based on one-dimensional convolutional neural network （1DCNN） and bidirectional gated recurrent unit （BiGRU） is proposed. First， the source dataset is trained on the training network to obtain the source model， and then a small amount of drive-end data is used as the target dataset to fine-tuning to obtain the target model. Finally， the Softmax function is used for fault diagnosis on the output of the fully-connected layer of the target model. Experiments show that the proposed fault detection method has an average accuracy of 99.67% in the scenario of small sample data of the target dataset， so the obvious classification effect and strong generalization ability could be seen.关键词：Wind turbine bearing;Small sample;Data generation;Gate mechanism;Transfer learning;Fine-tuning;Fault diagnosis
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发布时间：2022-11-10 - 摘要：In order to analyze the cause and influence factors of the torsional vibration of the dual mode multistage gear transmission， a hybrid electric vehicle dynamic model is established based on SIMPACK. By means of imposed excitation on the dynamics model and set output channel on it， a simulation system for torsional vibration is constructed. The vibration mode of transmission is analyzed as a torsional vibration simulation system， and is validated by the results of theoretical calculation and experimentation， which verified the effectiveness of the established simulation system. On this basis， some objective parameters， such as stiffness and damping of torsional damper， are analyzed for the effect of dampen vibration. The result shows that it has a good effect on the attenuation of torsional vibration in certain frequency through adjustments to characteristic parameters of torsional damper in a proper range.关键词：Dual mode;Gear;Transmission mechanism;Torsional vibration characteristic
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发布时间：2022-11-10
Test·Analysis
- 摘要：The Flange fork is a key part of automobile axle， and the machining accuracy of its end face tooth affects the reliability of axle and even the whole vehicle. The calculation and processing technology of end face tooth surface of the flange york are researched. In order to realize the measurement and correction of the tooth surface based on the measuring machine， the theory of tooth surface calculation and deviation correction is constructed. An example is introduced to realize the machining simulation of the tooth surface of the flange york， and the accuracy of tooth surface calculation is verified by comparing the gouge and excess amount of theoretical tooth surface and simulated tooth surface. The experimental processing of the end face tooth surface of the flange york is carried out， which verifies the correctness of the tooth surface correction theory， and theoretical reference for the processing of the end face tooth surface of the flange york is provided.关键词：Flange york end face tooth;Tooth surface calculation;Tooth surface deviation correction;Simulation processing;Experimental verification
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发布时间：2022-11-10 -
Research of the Test Bench and Method of Integrated Electric Drive Axle for Light Commercial Vehicle
摘要：Aiming at the test requirements of integrated electric drive axle for light commercial vehicle， the test bench of integrated electric drive axle for light commercial vehicle is designed. The test methods suit for integrated electronic drive axle are established refer to traditional drive axle and electric motor test methods. By using the developed test bench and established test method， the performance and fatigue tests of the integrated electric drive axle are finished. It provides test technology support for design and manufacture departments.关键词：Integrated type;Electric drive axle;Test bench;Test method- 6
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发布时间：2022-11-10 - 摘要：Aiming at the tooth profile deviation caused by the shaft angle error during the internal gear skiving， the motion relationship between the tool and the workpiece under the tool feed mode is established. Then， the mathematical models of the tooth profile deviation and tooth profile runout with the rotation speed of the tool and workpiece， the feeding speed of the tool， the helical angle of the tool， the shaft angle and the shaft angle error are established. And the generation mechanism of tooth profile deviation and tooth profile runout under the positive error of shaft angle are analyzed. Finally， on the basis of the mathematical model， the influence of the rotational speed of tool and workpiece， tool feeding speed， helix angle of the tool and shaft angle on tooth profile deviation and tooth profile runtout are analyzed. A certain guidance for the selection of technology in gear skiving is provided.关键词：Gear skiving machine;Shaft angle;Tooth profile deviation;Tooth profile runout
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发布时间：2022-11-10 - 摘要：Based on the reliability requirements of the differential，the hardware and software structures of the test rig are designed. A rig for differential test is developed， and reliability tests under two conditions of the high rate and low torque and the low rate and high torque are carried out according to the industry standards. The test result indicates that the test operation state is consistent with the test requirements， and the test results are accurate and reliable， fully meeting the test requirements of differential reliability. It provides practical guidance for the standardized conduction of the reliability testing of automobile differential.关键词：Differential;Reliability test;Test rig;Industry standard
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发布时间：2022-11-10
Development·Application
- 摘要：As the core component of electric vehicles， electric drive axles directly determine the performance of electric vehicles. A comprehensive review of the structure of single-speed and multi-speed electric drive axles is carried out. Firstly， the basic structures of single-speed and multi-speed electric drive axles are explained respectively. Then， the research status of multi-speed electric drive axles is summarized. Finally， the advantages and disadvantages of single-speed and multi-speed electric drive axles are compared， and it is clear that multi-speed is the development trend. On this basis， it is pointed out that the focus of future research is that increasing the degree of integration while the multi-speed.关键词：Single-speed electric drive axles;Multi-speed electric drive axles;Structure
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发布时间：2022-11-10
Review
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