1. Introduction As a mechanical engineer specializing in industrial machinery, I have dedicated significant effort to understanding the operational challenges […]
Design of Harmonic Gear Transmission Lubrication is the process of adding lubricant between two friction surfaces in relative motion, forming […]
Introduction Planning and constructing a multi-level and different-standard rail transit network is an important measure to promote the implementation of […]
During the flight of a certain aircraft, the N2 speed indicator was zero, causing a single engine to come to […]
The research object is a light truck drive axle, which is mainly composed of main reducer, axle housing, axle shaft, […]
After the spheroidizing annealing treatment of four processes, the SEM analysis results of each structure are shown in Figure 1. […]
Our country began to study the double circular arc gear from the mid-1960s, but entered the substantive research, test and […]
1. Principle of starting motor driving gear to start engine The starting motor of internal combustion engine is to convert […]
1. Gear crack morphology After cutting, grinding and polishing, the fault gear was detected under the optical microscope. The crack […]
The fracture of the driving gear is due to the looseness of the fastening nut of the starting motor gear, […]
The starting motor drive gear material is 20CrMnTi, and the heat treatment process is normalizing quenching and tempering carburizing quenching […]
It is concluded that the fracture of the driving gear is due to the looseness of the fastening nut of […]
1.Principle of starting engine with starter motor driving gear The starting motor of internal combustion engine is to convert electric […]
1. Hardness layer depth detection The results show that the surface hardness is 56-60hrc, the core hardness is 40-42hrc, and […]
1.Fracture morphology analysis 1.1 macroscopic observation of fracture The three teeth of the driving gear of the starting motor are […]
When the cyclic contact stress on the tooth surface exceeds the fatigue limit of the material, a micro crack appears […]
When calculating time-varying meshing stiffness of gear pair by energy method, the gear base is assumed to be rigid, while […]
The obtained time-varying meshing stiffness curve and meshing impact curve are input into the dynamic equation group at the same […]
The time-varying meshing stiffness curve obtained above is input into the dynamic equations to obtain the vibration response of single-stage […]
In 1991, Ozguven analyzed the non-linear dynamic characteristics of spur gear with six-degree-of-freedom non-linear bending-torsion coupling model, based on the […]
Starting from the error excitation of transmission in the direction of meshing line, taking the mechanical gearbox as the object, […]
In the established five-gear manual transmission model, there is coupling of finite element model, and the number of degrees of […]
The stiffness matrix of the rolling bearing connects the relative displacement and deflection of the inner raceway to the center […]
Modal flexibility is the degree to which a modal frequency of the system is easily excited by the transmission error […]
In order to facilitate comparison with subsequent experimental verification, corresponding numbered nodes are defined on the model box, through which […]
There are several calculation methods for gear drive errors, including finite element method and empirical analysis method.The transmission error obtained […]
The establishment of dynamic simulation model is completed by RomaxDesigner.In the model, the shafting is treated as a Timoshenko beam […]
Gears transmit power between the main and passive gears by the meshing force on the tooth surface. The meshing force […]
The fluctuation of gear meshing stiffness is an important excitation source for gear vibration. Accurate calculation of gear meshing stiffness […]
Profile modification is an effective method to reduce gear vibration, noise and thermal bonding failure. Profile modification can correct load […]
Gear drive system is a complex structure system which includes gear pair, drive shaft, bearing, box and other components. The […]
The center support stiffness is selected according to the allowable deflection of the drive shaft. The center support stiffness meets […]
For single-stage gear drive system, the influence laws of dynamic load and its parameters are analyzed under steady-state and no-load […]
In the nonlinear dynamic model of yaw-torsion coupling, there are two main factors affecting the yaw vibration, i.e. the bias […]
Process routing design in machining.In order to ensure that the geometrical shape, dimension measuring accuracy, position moving accuracy and various […]
Nonlinear dynamic model of yaw-torsion coupling was established for involute spur fixed-shaft gear drive and planetary gear drive respectively, and […]
1. Material Selection of Blank The mechanical gear blank is simple in structure and small in size, and it has […]
Nonlinear dynamic model of yaw-torsion coupling was established for involute spur fixed-shaft gear drive and planetary gear drive respectively, and […]
The blank is determined to be abrasive forging. After cleaning, the blank is positive-heat quenched and ground to effectively eliminate […]
(1) Acceleration signal testing principle A three-way acceleration sensor is installed at 180 degrees intervals on the same circumference of […]
Nonlinear dynamic model of yaw-torsion coupling was established for involute spur fixed-shaft gear drive and planetary gear drive respectively, and […]
The innovations of the research work can be summarized as follows: (1) The coupling relationship between the acting direction of […]
Nonlinear dynamic model of yaw-torsion coupling was established for involute spur fixed-shaft gear drive and planetary gear drive respectively, and […]
Gear drive system is widely used in various mechanical equipment because of its accurate transmission ratio, stable and reliable, long […]
Gear drive system is the core mechanism of mechanical equipment and the main equipment to determine the performance of the […]
(1) Deep analysis of tooth bias torque caused by deformation of drive shaft and bearing and tooth error is introduced […]
For tracked vehicle gear drive system, firstly, the dynamic loads of main components in different gears are compared and analyzed; […]
In theory, the higher the gear machining accuracy level, the better the dynamic performance of the gear drive system, but […]
The bending and torsional vibration displacements of the concentrated mass points on each drive shaft obtained by simulation are taken […]
Bearing is the main component connecting the gear drive system and the box. Under the action of bearing support reaction, […]
Under gear 1-8, the load-sharing coefficient of the loaded planetary row is shown in the figure, in gear 1-4, the […]
Steady state condition refers to the condition under which the vehicle travels at a constant speed in a certain position […]
In order to guarantee the normal operation and use of the double gear effectively and facilitate material processing, the height […]
No-load knocking of gears is one of the important sources of vehicle knocking noise. No-load knocking usually occurs in two […]
During machining and assembling of gear drive system, there is deviation between actual and theoretical center distance of gear due […]
Under steady-state conditions, the engine speed range of heavy-duty vehicles studied ranges from 1000 r/min to 4200 r/min.Under full throttle […]
The centralized parameter method is used to establish the dynamic model of gear transmission system.This method has a small amount […]
Taking single-stage planetary gear drive as test object, vibration characteristics test is carried out on the special test bench for […]
The bearings and gears are simplified as concentrated mass points and the rolling bearings are simplified as isotropic elastic supports.A […]
For acceleration, the main reasons for errors between simulation results and test results are as follows: 1.The parameters such as […]
