最新刊期
期 2 ， 2022
- 摘要：Through the fatigue test of modified spur gear with root crack fault by fatigue testing machine，the rule of root crack propagation is obtained，the root crack is easier to expand along the direction of tooth width than the direction of tooth root， and the growth rate is slow at first and then fast. The automatic propagation of the root crack of modified spur gear with same initial crack is analyzed by using the simulation software FRANC3D， and the propagation direction and path of the crack are determined. By comparison， the simulation results are consistent with the experimental results， which shows that the constructed simulation model is verified by the fatigue test， and the reliability of the conclusion is proved. The research on the propagation path and direction of root crack can provide a reliable basis for the design and manufacture of practical gears. On the basis of this study， the related problems of crack growth life are discussed.关键词：Modified spur gear;Tooth root;Crack propagation;Fatigue experiment;Numerical simulation;Fatigue life
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发布时间：2022-09-25 - 摘要：Based on gear transmission conjugate-curve theory research， taking the internal meshing gear transmission with curve element as the object， general meshing equation of spatial conjugate curves along the designated contact angle position is derived and general expressions of space conjugate curves under internal contact conditions are also obtained. According to space equidistant-enveloping method， conjugate surfaces which inherit the meshing characteristics of spatial conjugate curves are generated and three contact types including convex-to-convex， convex-to-plane and convex-to-concave forms are proposed if changing the relative motion position and equidistant radius. Taking the spatial cylindrical spiral curve as an example， combined with the theoretical analysis results and given design parameters， three-dimensional solid models of internal meshing gear pair with convex-to-concave contact are established. The pressure angle on the tooth surface contact point is defined and calculation method of sliding ratio for the mated tooth surfaces is also put forward in terms of space conjugate curves. Calculation and analysis of the contact locus of conjugated internal meshing tooth surfaces are conducted. Further studies on meshing characteristics， contact mechanics and manufacturing method of tooth profiles will be carried out.关键词：Internal meshing;Curve element;Basic principle;Tooth surface generation;Calculation and analysis
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发布时间：2022-09-25 - 摘要：Aiming at the structural complexity of chain drive system and the difficulty in tension distribution analysis of the scraper chain，the tension distributed characteristics of the scraper chain are studied based on the design of state observer.A chain-drive virtual prototype model is constructed by the Adams simulation software，and the discrete mathematical model of the chain drive system is then established based on the finite element analysis.Through design of the state observer，the estimation of tension distribution of the scraper chains is accomplished，so as to provide an effective basis for the operation status assessment of the scraper conveyor.关键词：Chain drive system;Tension distribution;State observer;Tension estimation
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发布时间：2022-09-25 - 摘要：Aiming at problem of constraint violation in solving the dynamics equation， a method combining the projection method with Udwadia-Kalaba equation is proposed. In this method，the numerical solutions of the zero-order and first-order generalized variables of the system are projected to the constrained manifold defined by the constraint equation， the offsets of the numerical solution are obtained， then the offsets are transformed into the constraint force and integrated into Udwadia-Kalaba equation to achieve the purpose of restraining the constraint violation. Compared with the improved Udwadia-Kalaba equation which only considers the first order constraint equation， the simulation results of dynamics model of industrial manipulator subject to constraint show that the modified method can effectively improve the calculation accuracy of generalized variables and zero-order and first-order constraint errors.关键词：Projection method;Constraint violation;Udwadia-Kalaba equation;Dynamics modeling
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发布时间：2022-09-25 - 摘要：A 2-DOF spatial 8R parallel mechanism is proposed for hip joint rehabilitation. The model of spatial 8R parallel mechanism is established， and the initial configuration and general configuration of the mechanism are analyzed by using screw theory. The geometric model and kinematics equations of the spatial 8R parallel mechanism are established by D-H method， and the kinematics equations of the mechanism are obtained. The correctness of the kinematics equation of the spatial 8R parallel mechanism is verified by Adams software and theoretical calculation， and the variation law of the angular displacement of the mechanism in one period under different motions is obtained. This spatial 8R parallel mechanism has stable performance and can carry out smooth movement， which can effectively improve the rehabilitation effect of hip joint.关键词：8R parallel mechanism;Hip joint;Screw theory;D-H method;Kinematics
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发布时间：2022-09-25 - 摘要：Aiming at the problem of gear vibration characteristics with considering the error and randomness of tooth surface friction parameters are not clear. Combined with statistical methods and concentrated mass methods， the numerically study of the random characteristics of errors and tooth surface friction parameter is carried out. The influence of gear tooth errors on tooth surface friction parameters is analyzed. The bending-torsional coupled vibration model of a spur gear transmission is established in consideration of error and randomness of the tooth surface friction parameters. The fourth-order Runge-Kutta method is used for numerical solution， the vibration response of the gear transmission is obtained. The influences of gear error and the random tooth surface friction parameters on gear vibration responses are explored. The results show that the dynamic responses of the gear pair have more complicated randomness in the frequency domain and phase diagram under the collective effects of the error and the random tooth surface friction. However， error randomness interferes more with the dynamic stability of the gear system. And the research results provide a theoretical reference for the dynamic design of the gear transmission.关键词：Random error;Tooth surface friction;Gear transmission;Gear dynamics
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发布时间：2022-09-25
Theory·Reserach
- 摘要：To improve the comprehensive dynamic meshing performance of a certain gear product， a design method for controlling the polynomial coefficients of the topological modification of the tooth surface is proposed. By using Ease-off surface， through the loaded tooth contact analysis and elastohydrodynamic lubrication model， the gear transmission error and meshing power loss are calculated. Taking the loaded transmission error amplitude， meshing efficiency and its fluctuation as the goals， through orthogonal test design and multi-factors and multi-levels simulation， the best topological modification parameters of the tooth surface are obtained. The influence of modification parameters on meshing performance is analyzed. The results show that the tooth profile is closely related to the spiral profile modification， with the increase of the tooth profile modification ratio， the contact path inclination becomes larger， the load is concentrated in the middle of the tooth surface， the contact ratio of tooth surface and the curvature of contact line difference become larger， which is beneficial to reduce the contact stress of tooth surface， alleviate the edge contact， and reduce the tooth surface friction loss at the same time.关键词：Ease-off surface;Tooth surface modification;Loaded transmission error;Meshing efficiency;Orthogonal test
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发布时间：2022-09-25 - 摘要：After the occurrence of natural disasters or accidents， robots are often needed to go deeply into the disaster site to find out the situation or provide assistance. The structure of wheel-legged planetary probe robot is successfully applied by reference， for the special unstructured terrain of the post-disaster site， a new search and rescue robot with five wheels and four swinging arms is designed for the special unstructured terrain in the disaster site. Through the parameter design and statics analysis of the key components， the rationality of static feature is verified， and the mathematically modeling of process of obstacle crossing is carried out， the factors that affect the height of the robot obstacle surmounting are obtained. Then the virtual prototype simulation is carried out to verify the rationality of the dynamic characteristics and the correctness of the mathematical modeling. Finally， an experimental platform is built to verify the obstacle surmounting ability of the designed robot， which provides a theoretical basis for the design of similar wheeled robots in the future and has a certain reference significance.关键词：Wheel-legged rover;Five wheels and four swinging arms structure;Four-bar linkage;Single arm suspension;Virtual prototype simulation
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发布时间：2022-09-25 - 摘要：The ANSI/AGMA 2003-B97 is a widely used bending stress checking standard for spiral bevel gears. The calculation formula of bending strength checking is carried out， the key parameters are modified， the problem of insufficient safety margin of bending strength checking solved， and this method is verified by finite element contact analysis. Based on the modified bending strength checking standard， the strength checking software of spiral bevel gear is developed， and the optimal design scheme of tooth surface is given. The proposed method can improve the accuracy and efficiency of tooth surface bending strength checking calculation.关键词：Spiral bevel gear;Bending stress;AGMA standard;Finite element contact analysis
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发布时间：2022-09-25 - 摘要：In order to improve the meshing performance of spiral bevel gears， a novel design method of large contact ratio along face width contact path is proposed. The design contact ratio， transmission error amplitude and symmetry of spiral bevel gear pair are preset， contact paths of the inner diagonal and along the face width with large contact ratio are obtained by iteratively optimizing the local synthesis parameter. With the help of tooth surface contact analysis and loaded tooth contact analysis methods， the comparisons in tooth strength and load transmission error of the two large contact ratios designs are performed. The numerical examples show that the large contact ratio of contact path along the face width increases up to13.67% and 10.05% in the bending strength of pinion and wheel， while up to 5.77% in contact strength of the gear pair， respectively， and the amplitude of the load transmission error decreases up to 31.32%， moreover it can also improves the sensitivity of the contact pattern to assemble errors.关键词：Spiral bevel gear;High contact ratio;Contact pattern;Gear tooth strength;Error sensitivity
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发布时间：2022-09-25 - 摘要：Aiming at the existing problems of rehabilitation robots in passive rehabilitation training for patients with severe upper limb hemiplegia， a novel 7-DOF upper limb exoskeleton robot is proposed， and a new hand fixator is designed to replace the grip of the traditional exoskeleton to better achieve the effective wrist training for patients with severe upper limb hemiplegia. According to the exoskeleton model， the Denavit-Hartenberg （D-H） coordinate system is established by using Matlab， and the workspace is simulated to verify that the workspace met the design requirements. Dynamics simulation of exoskeleton is performed by using Adams. In view of the problem that the simulation results do not conform to the reality due to the lack of the injured limb in simulation， a new design that adds the weight of the patient's upper limb to the center of mass of the exoskeleton is adopted. According to the analysis of the loading characteristics， the rationality of the selection of the robot driver is verified， which provides a theoretical basis for the development of the physical prototype.关键词：Rehabilitation training;Exoskeleton robot;Hand fixator;Dynamics simulation
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发布时间：2022-09-25 - 摘要：In light of the complexity of calculation of joint force of spatial mechanism system，a mechanical analysis of joint constraint reaction of 3-UPS Parallel mechanism is carried out. Considering the relationship between Lagrange multiplier and constraint reaction of spatial mechanism，the joint reaction of the spatial parallel mechanism is calculated based on Lagrange augmented method. At the same time，the calculation results are verified by Newton Euler method and Adams and Matlab Software co-simulation，and a comparative analysis of the two results is conducted. The results show that the size of the joint constraint reaction of the spatial mechanism calculated by the two methods is basically the same，and the error is between 0.5% and 1.2%，which is relatively small. The correctness of the method of using Lagrange multiplier and Lagrange augmented method to calculate the joint constraint reaction of spatial mechanism is verified，and a certain reference for the mechanical analysis of spatial mechanism is provided.关键词：Spatial parallel mechanism;Joint restraint reaction;Lagrange multiplier;Newton Euler method
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发布时间：2022-09-25 - 摘要：Monte Carlo method and envelope method are used to analyze the cooperative space and singular points of multi manipulator cooperative system model. The standard D-H parameter method is used to establish the coordinate system， the kinematics model of the robot is established in Matlab， and the forward kinematics equation of the robot is obtained. The workspace of each manipulator is obtained by Monte Carlo method， the common area points are extracted by envelope method， and the cooperation space of the multi manipulator cooperation system and the joint angle range of each manipulator in the cooperation space are obtained. An algorithm to calculate the operability is presented. According to the algorithm， the singularity distribution of multi manipulator in the cooperative space is calculated and analyzed. The Matlab/Robotics toolbox is used to build the simulation platform， and the algorithm is compiled for simulation analysis， which verifies the correctness and rationality of the kinematics model analysis of the multi robot cooperative system， the feasibility of the proposed algorithm is proved and the foundation for the subsequent coordinated operation and trajectory planning to avoid singular points is laid.关键词：Multi manipulator cooperative system;Monte Carlo method;Envelope method;Cooperative space;Manipulability;Singular point
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发布时间：2022-09-25
Design· Calculation
- 摘要：Taking the hydraulic follow-up arm of a company as the research object， an improved D-H coordinate system is established， and a 3D workspace of the end-effector of the hydraulic follow-up arm is solved by the forward kinematics equation. Based on Monte Carlo method and extreme value theory， the working face at the height of fracturing wellhead is solved， and the influence of the arm length of hydraulic servo arm on the stopping distance and working width is studied under the condition of fixed stopping error. The results show that， under the fixed stopping error， when the current arm length is greater than or equal to the rear arm length， with the extension of the front arm of the hydraulic follow-up arm， the equal slope of the stopping distance increases， and the working width is basically stays unchanged. With the extension of the large arm after the hydraulic follow-up arm， the parking distance is basically stays unchanged， but the slope such as the working width becomes wider. On this basis， a reasonable interface height is proposed to alleviate the large difference between the two arms. The research results can provide theoretical reference for the optimization design of the hydraulic follow-up arm.关键词：Hydraulic follow-up arm;Monte Carlo method;Extremum theory;MATLAB simulation;Workspace
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发布时间：2022-09-25 - 摘要：Aiming at the phenomenon of spectrum ambiguity caused by traditional spectrum analysis method under non-stationary load， a signal model and order analysis method is used to study the fault diagnosis of the wind turbine gearbox. The vibration signal model of high speed stage of gearbox under non-stationary load is established， and the structure of time spectrum and order spectrum is derived. The order analysis method is used to analyze the order spectrum of vibration signal and extract gear fault feature. Finally， the real wind field gearbox data is analyzed， and the fault in gearbox is identified accurately.关键词：Wind turbine;Gearbox;Nonstationary;Signal model;Order analysis;Fault diagnosis
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发布时间：2022-09-25 - 摘要：The working principle of the jaw type electromagnetic clutch is introduced， then the dynamic engagement process of the end face teeth is analyzed in detail. The engagement of the end face teeth with different speed difference is explored. Through theoretical calculation， the maximum speed difference of the clutch could engage is obtained. Through Adams virtual prototype simulation method， the influence of different speed difference on clutch engagement time and impact force is obtained. Simultaneously， the maximum speed difference of clutch smoothly engaging and the result of theoretical calculation are verified. The research provides a reference for the practical application and design improvement of the jaw type electromagnetic clutch.关键词：Jaw type electromagnetic clutch;End face tooth engagement;Speed difference;Numerical simulation
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发布时间：2022-09-25 - 摘要：Taking an intermediate reducer as the research object， the thermal-fluid coupling calculation model is established， and the boundary conditions of the external flow field of the intermediate reducer is set by using Fluent simulation technology， internal and external heat balance of the intermediate reducer are analyzed. The method of applying heat source inside the casing is simplified， and the effects of different air velocities on the pressure， convective heat transfer coefficient and temperature distribution of the casing wall are analyzed. The simulation results show the maximum pressure appears on the windward side of the casing under different air velocities， and the two end faces of the casing and the leeward side are in a negative pressure state， which is related to the inlet and outlet position of the external air flow field. The temperature of the windward side of the casing is lower than that of the leeward side. With the increase of air velocity， the heat dissipation performance of the casing is enhanced， but the wall pressure is also increasing. Therefore， the air velocity should be considered from the heat dissipation and strength of the casing.关键词：Intermediate reducer;Casing;Thermal-fluid coupling;Temperature
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发布时间：2022-09-25 - 摘要：As a key component of electric drive assembly of electric vehicles，the reducer is one of the main noise sources of electric vehicles.The noise level of the reducer is directly related to electric vehicle noise，vibration， harshness （for short NVH） performance and passenger comfort.Taking a certain type of reducer as the research object，the mechanism of vibration and noise generation of the reducer is analyzed. On this basis，four simulation indicators for evaluating the NVH of the reducer are introduced: transmission error of the reducer，contact spots，dynamic stiffness of the bearing seat and modal.Based on these four indicators，simulation research and test benchmarking are carried out respectively.The results show the simulation and test results are in good agreement.Based on the above research results，the transmission error and contact spots of the two-stage gear of the reducer need to be optimized. Through strengthening of spoke structures and modification of gear teeth，the results show that the simulation transmission error and contact spots of the secondary gear can be improved and the noise of the optimized scheme test can also be reduced.关键词：Reducer;Electric vehicle;NVH;Transmission error;Contact pattern;Dynamic stiffness;Modal;Noise
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发布时间：2022-09-25 - 摘要：To clarify characteristics of trapped-oil of gear motor and its influence on output torque and output speed， in terms of meshing and oil trapping process of motor gear pair， the medium pressure distribution on the tooth flanks and the solution model of oil trapping， the coupling calculation formulas of output torque， output speed and trapped oil pressure are established. The example calculation and result analysis are also conducted. The results show that characteristics of the connection between the expanded trapped oil and the injection medium， the compressed trapped oil and the release medium through the unloading groove determine that the trapped oil phenomenon of the gear motor is lighter than that of the gear pump， and the conventional symmetrical double rectangular unloading groove can meet the unloading requirements of trapped oil. Trapped oil can effectively suppresses torque ripple. The more sufficient the unloading area is， the better is the connection through the unloading groove， and the more obvious is the suppression effect， but the less obvious is the suppression effect of speed ripple. The research results provide a certain theoretical basis for further research and development of high-quality gear motor.关键词：Gear motor;Trapped-oil pressure;Trapped-oil output torque;Trapped-oil output speed;Ripple coefficient;Rectangular relief groove
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发布时间：2022-09-25 - 摘要：Based on the transmission theory of single roller enveloping end face meshing worm drive and isothermal elastohydrodynamic lubrication theory， and considering the influence of surface wavy roughness， a numerical analysis method is adopted to analyze the influence of different meshing positions， roughness amplitude， roller radius and throat diameter coefficient on the elastohydrodynamic lubrication performance of transmission pair. The results show that the lubrication performance is the worst at the top of the worm gear at the meshing position of the transmission pair， and the increase of roughness amplitude， roller radius and throat diameter coefficient has a positive effect on the lubrication performance， and makes the oil film thickness increase and the oil film pressure decrease.关键词：Roller enveloping;End face meshing worm gear;Wavy roughness;Elasto-hydrodynamic lubrication;Oil film analysis
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发布时间：2022-09-25 - 摘要：In order to improve the structural performance of the aero-engine gearbox housing and reduce the adverse effects of the engine bad working conditions on the supporting components， the topology optimization theory based on variable density method is adopted， and the minimum flexibility index and weighted average transverse eigenvalue are taken as the target number， and the coupling of thermal-elastohydrodynamic-lubrication effects of the supporting components are considered. Taking the maximum deformation less than 0.15 mm and the equivalent stress less than the material stress as the constraint conditions， the topology optimization design of the aero-engine gearbox housing is carried out. According to the topology optimization results， the geometric reconstruction of the housing structure is carried out， and the strength， stiffness and mass of the shell structure before and after optimization are compared and analyzed. The results show that， after optimization， the housing mass is reduced from 5.53 kg to 5.107 kg， the weight is reduced by 7.6%， the maximum deflection of the housing is reduced from 0.173 1 mm to 0.127 mm， the deformation is reduced by 26.6%， the maximum equivalent stress of the housing is reduced from 124 MPa to 116.9 MPa， the stress is reduced by 5.7%.The maximum deformation and equivalent stress of the housing are effectively reduced， and the strength and stiffness of the housing are significantly improved. It is of great significance to improve the reliability and service life of aero-engine central transmission shell.关键词：Aero-engine;Gearbox;Topological optimization;Variable density method
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发布时间：2022-09-25 - 摘要：Aiming at people cannot provide enough strength in lifting heavy objects， an urgent need of power supporting devices attached to the human body， a wearable elbow joint power mechanism with rigid and flexible coupling is proposed to provide assistance for the human body in the lifting process. It solves the problems that the traditional rigid mechanism is bulky and inflexible， and that flexible mechanisms have difficulty in supporting the weight of the human body. The configuration and characteristics of the mechanism are analyzed. The degree of freedom is calculated based on the screw theory， the closed vector method is used for position analysis. The Matlab is used to draw the change curve of flexible cable length and flexible cable tension to obtain the flexible cable length and tension at different angles. The workspace diagram is drawn， and the internal continuity of the workspace is obtained， which verify the correctness of the kinematics theory. The rigid flexible coupling elbow joint power assisted mechanism has good motion performance and can assist the elbow joint.关键词：Rigid and flexible coupling;Elbow joint;Power assist;Degree of freedom;Position analysis
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发布时间：2022-09-25
Test·Analysis
- 摘要：In order to study the mode switching and fault reconfiguration of the 10 kW dual redundancy electromechanical servo system driven by differential when one channel fault occurs， through simulation analysis， the system parameters of transient response and frequency characteristic under the active- active working mode are compared with those under the active-standby working mode. The sinusoidal switching process of the active-active switching and active-standby switching are analyzed. The sinusoidal variation curves of the active-active switching mode and the active-standby switching mode are carried out by the test rig. Simulation comparison shows that， comparison with the active-standby working mode， it is found that the active-active working mode possesses better parameters of transient response and frequency characteristic. Consistent with simulation， the test shows that the switching time and oscillation process of switching at the zero point are longer and non-smoother than those of switching at the maximum displacement point. For the 10 kW electromechanical servo system with only internal friction and inertia load， either switching mode can be switched reliably.关键词：Dual redundancy electromechanical servo system;Mode switching;Fault reconfiguration;Inertia and friction loadInertia and friction load
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发布时间：2022-09-25 - 摘要：When multiple bearings in a gearbox failure simultaneously，conventional blind source extraction （BSE） on the vibration signals of bearing multi-type faults would not be ideal due to the mutual coupling effect among each of the fault sources. A BSE based on sparse representation self-learned dictionary method is proposed to solve the above problem.Firstly，apply the self-learned sparse dictionary originating from sparse representation on the multi-type faults vibration signals directly and a set of self-learning dictionaries are obtained.Then，the multi-type faults vibration signals are re-constructed basing on the obtained learned dictionary to eliminate noise and interference signals.Finally，apply the BSE method on compound fault signals of reconstructed rolling bearings，each single fault signal of rolling bearing is extracted，and then the envelope demodulation analysis is carried out one by one to obtain the corresponding fault characteristics.Feasibility and effectiveness of the proposed method are verified through experiment.关键词：Self-learned dictionary;Blind source extraction;Rolling bearing;Multi-type faults diagnosis
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发布时间：2022-09-25 - 摘要：In order to better identify the faults of gearbox under varying working conditions caused by noise and time-varying speed conditions， a fault identification method of gearbox under varying conditions is developed by combining DWAE and GRUNN， which could extract robust fault characteristics from noisy samples. The Adam and Dropout methods are used for training， and the softmax classifier is used to accurately identify the operating state of the gearbox under different working conditions. The results show that the six fault states of gears can be separated effectively when the model is used to identify gear faults， so as to meet the optimization function of gear state clustering. This model can extract the robust characteristic parameters of DWAE， and it can also use GRUNN to eliminate the gradient. When the number of training samples increased， the accuracy of waiting samples also improved significantly. When the number of samples is more than 200， stable accuracy could be obtained by testing the waiting samples， and the accuracy is the highest by dWAe-Grunn method. The model can maintain good accuracy under variable speed working conditions.关键词：Variable working condition gearbox;Fault identification;Deep wavelet autoencoder （DWAE）;Gated cyclic unit neural network （GRUNN）;Accuracy
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发布时间：2022-09-25 - 摘要：As a very important part of the chain drive system， the sliding friction between the pin shaft and the sleeve will produce wear and tear during the operation， which will lead to the chain elongation failure to a certain extent. In view of this failure form， the surface of the pin shaft is treated with chromvanadizing to improve its surface hardness and then improve the wear resistance of the pin shaft. Through experiments， the influence of different temperatures and time on the penetration layer is studied to improve the quality of the infiltration layer， thus greatly improving the wear resistance of the chain.关键词：Chain;Pin shaft;Chromvanadizing;Surface hardness;Penetration layer;Temperature;Time
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发布时间：2022-09-25 - 摘要：Aiming at the bad environment of coke oven top and low accuracy of manual temperature measurement， a scorpion like robot for coke oven temperature measurement is designed. The robot is composed of walking mechanism and actuator. The overall structure of the temperature measuring robot is modeled， the kinematics equation of the manipulator is solved and simulated and its motion trajectory is planned. The workspace of the furnace cover lifting mechanism is analyzed to obtain the reachable space range of the end manipulator. The robot physical prototype is made to verify the positioning of the robot temperature measuring manipulator， and the error is within 2 mm. The workspace verification of the cover lifting mechanism can realize the workspace obtained by Monte Carlo， which lays a foundation for actual temperature measurement.关键词：Coke oven temperature measurement;Kinematics;Spatial trajectory;Working space
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发布时间：2022-09-25 - 摘要：Aiming at the requirements of large radial size， large load-bearing load and high precision of the thin-walled gear ring of a planetary reducer for a high-altitude rescue vehicle， the deformation of the thin-walled gear ring during processing and heat treatment is analyzed， and the cause of the deformation of the workpiece is found. A solution is developed， the process route of thin-walled ring gear processing and heat treatment is optimized. By using Deform heat treatment simulation software， the optimized heat treatment route is simulated， and the feasibility of the optimized scheme is verified. This optimization scheme improves the accuracy of the workpiece， meets the requirements of a certain high-altitude rescue vehicle planetary reducer to work normally under complex working conditions， and ensures the safe and stable operation of mechanical equipment. Engineering practice shows that this optimization scheme is suitable for low-speed and heavy-duty high-altitude rescue vehicle slewing mechanism reducer， and has high economic and practicality.关键词：Planetary reducer;Thin-wall gear ring;Machining process;Optimization
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发布时间：2022-09-25
Development·Application
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