(1) Comparison between simulation and experiment Figure 1 compares the acceleration simulation and experimental results of pinion end with obvious […]
(1) Design variables The design variables of static performance optimization model and dynamic performance optimization model are the same. (2)
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
Then the engagement force Np, Ng and friction force Fp, Fg can be expressed as: Where: lambda (t) is the
The experiment is carried out on the FZG Standard Test stand, as shown in Figure 1. The modified A-gear with
The dynamic simulation is carried out by using Benedict amp; Kelly model and time-varying friction coefficients obtained in Figure 2.8
Based on the dynamic and static characteristics, the optimization model of tooth profile modification is established, and the optimization design
First, the differences of gear dynamic characteristics with different friction models are discussed.Figures 1 and 2 show the time and
The friction coefficient of tooth surface is affected by many factors, which will change with meshing position, lubrication state and
The fluctuation of gear meshing stiffness is an important excitation source for gear vibration. Accurate calculation of gear meshing stiffness
Gear system thermal behavior plays an important role in high-speed and heavy-load gear transmission, affecting the strength, life and safety
Profile modification is an effective method to reduce gear vibration, noise and thermal bonding failure. Profile modification can correct load
In order to study the comprehensive influence of meshing force and friction force on tooth surface, a simplified dynamic model
Firstly, the engagement process of the gear is analyzed. The engagement state and force diagram of the gear is shown
In addition to causing translation vibration of gear along the vertical engagement line, the friction moment will also form to
Analyze the time-domain curve of meshing stiffness and meshing force of the gear under the optimal modification amount, and compare
The thermal behavior of gear system is comprehensively studied.Based on thermal design and thermal check of gear transmission system, a
The modification length is 2.8mm, the change range of modification amount is [0, 0.05mm], and the value interval is 0.02mm.
There are many types of profile modification curves. According to the different functional forms of the modification quantity with respect
Determining the profile modification quantity is a complicated problem. If the profile modification quantity is too large, the coincidence degree
Tooth surface friction is a force formed by the relative sliding between the two contact tooth surfaces of a gear
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
Cut and process the inspection gear along the axial direction and about 1/4 diameter into U-type impact test specimen, and
1. Group test results Data of fatigue test results obtained by group method of shot peened gear and non shot
1. Test method The bending fatigue test fixture of gear material adopts the single tooth loading method shown in Figure
Bending fatigue performance is an important index to evaluate the bearing capacity of gears. Shot peening is an effective way
In the nonlinear dynamic model of yaw-torsion coupling, there are two main factors affecting the yaw vibration, i.e. the bias
For single-stage gear drive system, engine excitation is taken as input condition, dynamic characteristics and parameter influence rules under steady-state
Metallographic structure evaluation of failed gears is carried out according to national inspection standards.The metallographic observation is etched with 4%
The vertical coal mill is shown in Figure 1.Reducer is an important part of coal mill and is mainly used
There are three aspects to consider when designing the tip radius: (1) No interference occurs in the running process of
Process routing design in machining.In order to ensure that the geometrical shape, dimension measuring accuracy, position moving accuracy and various
Take the point on the center line as the coordinate origin, fix the base vectors of the coordinate systems S0
Tooth thickness is an important parameter for balancing the fatigue life of large and small wheels.Since the number of small
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
Use CAD software to build accurate 3D model of linear bevel gear pair, as shown in the figure. By substituting
The tooth profile of the driving and driven section of the linear gear pair is shown in the figure. The
Bending fracture of teeth and pitting and flaking of tooth surface are the two most common failure modes of main
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
The linear gear can also improve the transmission stability by increasing the degree of coincidence. The calculation formula of line
Establish the right-hand coordinate system, as shown in Figure 1. S (o-xyz) and S (oxpypzp) are the main and driven
(1) Acceleration signal testing principle A three-way acceleration sensor is installed at 180 degrees intervals on the same circumference of
The locating elements for spiral bevel gears are V-shaped blocks and press plates. After positioning the workpiece, before drilling, it
Nonlinear dynamic model of yaw-torsion coupling was established for involute spur fixed-shaft gear drive and planetary gear drive respectively, and
1 Construction of modified tooth surface The modified tooth surface is constructed by superposition of theoretical tooth surface and modified
Gear is an important basic component in mechanical transmission. Different from other types of gears, bevel gear, as a special
The positioning of the workpiece is achieved by the contact between the positioning surface on the workpiece and the V-block
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
Compared with traditional cutting process, the hot precision forging cold extrusion compound forming process has the advantages of high efficiency,
The advantages of forming cylindrical gears by plastic forming are as follows: 1) Productivity.Taking the small module gear used in
Gears are wheel-shaped mechanical parts that transmit torque by whistling closure of teeth.Gears can change speed and torque, direction of
The calculation of impact force in this paper is based on the principle of energy conservation at the moment of
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
