In order to study the influence of different tooth profile modification amount and different modification length on the stiffness and […]
Fig. 1 shows the blank flow velocity field under different pressing amounts. The velocity field of helical gear die forging
The die forging process of helical gear studied adopts closed die forging process, which is divided into two processes: blanking
According to the operating conditions of high-speed railway traction gear transmission system, different experimental conditions are designed and steady-state experiments
According to the interference diagram of hobbing helical gear and the change of width parameters of helical gear and length
As required, the helical gear hobbing take the modulus of 2.5mm as an example for solid modeling. Using the designed
（1） Undercutting theory of helical gears When the face gear engages with the tool, the speed of the former at
According to Newton’s second law of motion and D’Alembert’s principle, an 8-DOF torsional vibration and translational vibration coupling dynamic model
The above single pair of tooth stiffness algorithm is used to calculate the comprehensive meshing stiffness of helical gears with
For helical gear system, generally, the total coincidence degree is greater than 2, that is, at least two tooth pairs
The noise generated by structural vibration is an important noise source in helical gear system. In the design stage of
Gear transmission is the most important and widely used mechanical transmission device, which is widely used in machinery, transportation, chemical
Using the parametric design of helical gear in Chapter 2, a helical gear with the same modulus as helical cylindrical
In the parametric design of involute helical cylindrical gear, the meshing motion simulation of helical cylindrical gear and helical surface
When hobbing helical gear, first check the correctness of fixture installation, the accuracy of tool setting and the adjustment of
(1) Outer diameter of helical gear hob The outer diameter of helical gear hob not only affects the stability of
Helical gear hob is one of the most widely used high-efficiency tools. Gears with any number of teeth with the
Gear hobbing belongs to the generating method, and its principle is equivalent to the meshing transmission of a pair of
Before deriving the equation of helical gear, the meshing equation is obtained first. The process of machining helical gear is
When the generating method is used to process helical gear, the main parameters are determined first: the rotation direction of
In order to verify the accuracy and rapidity of the method in this paper, the same gear parameters are used
When the helical gear is an ideal tooth profile, assuming that there is no backlash between the gear pairs and
The defects in the forging process of helical gear are shown in the figure. In the process of helical gear
For the research of traditional helical gear forging process, scholars and researchers at home and abroad mainly focus on the
The helical gear can be regarded as a sheet helical gear. The helical gear is divided into m sheet helical
The modification amount of helical gear profile CA = 30 μ m. The helical gear profile modification length La =
Because the load of gear transmission system fluctuates greatly in the alternating area of tooth number, it will cause vibration
The mentioned feature line family is also of great significance to study the machining principle of gear profile, because any
Diagramming the imaginary circle diameter DPT of helical gear measuring ball The figure is a diagram of the imaginary circle
The figure shows the geometric relationship of the measuring ball in the alveolar. The N-N section is the normal section
It is known that the parameter of an external cylindrical helical gear is Mn = 5, α n= 20 °，
In the manufacture, inspection and design of gears, the span of measuring ball is widely used to measure the tooth
The following equation can be obtained from the geometric knowledge of involute gear: Where, α T is the end face
The measurement can be divided into two cases: the measurement of the profile error of the end face on the
Three dimensional crack models at different positions are established on the helical gear, and the stress intensity factor and J-integral
The finite element software is used to simulate the helical gear with three-dimensional cracks, and the values of stress intensity
In order to study the effect of crack length on stress intensity factor and J-integral, the above semi elliptical initial
After the three-dimensional model of the gear is established, the material used in gear simulation is 17CrNiMo6, and then the
In order to analyze the three-dimensional crack model of helical gear root, a pair of three-dimensional helical gear models need
According to the measured value of stress intensity factor, kmax and Kmin can be obtained, and the range of stress
If the stress state of the crack and the displacement direction of the crack surface are taken as the classification
Helical gear is a type of gear used in a variety of applications where smooth operation, high speed, and/or heavy
Under the elastic-plastic condition, the J-integral of helical gear crack describes the stress and stress field at the crack front
Gear is of great significance to all kinds of mechanical equipment. Its performance may directly affect the service life and
Figure 1 and Figure 2 show the frequency domain diagram of angular acceleration of driven wheel after modification. It can
Helical gears are meshed at the same time in the process of meshing. When studying the dynamic problem of gear
Transmission error is an important index of gear transmission performance. Transmission error refers to the difference between the actual position
Worm machining helical gear is mainly realized by changing the center distance between cutter and gear along the tooth width
As shown in Fig. 1, the tooth surface of the modified helical gear obtained by changing the center distance is
The phenomenon of tooth surface twist refers to the torsion of tooth surface along the direction of tooth width. As
Worm or hob machining helical gear coordinate system is shown in the figure, S1 is worm or hob coordinate system,
In the process of helical gear meshing, because the hardness of the gear shaft is higher than that of the
The MNF file generated in ANSYS is used to replace the ring gear on the wheel hub, that is to
The dynamic characteristics of marine gearbox transmission system directly affect the fatigue life of gear and the transmission efficiency of
The mesh quantity and quality of the finite element model directly affect the speed and accuracy of the calculation results.
Taking the gear pair in gear parameters as an example, the three-dimensional geometric model of four groups of gear pairs
Gear is an important basic part of industrial equipment. With the development of modern industrial technology, higher requirements are put
In the process of helical gear transmission, the tooth surface contact deformation is caused by sudden change load, and the
In the quenching process of automotive transmission helical gear, the control of temperature, stress and thermal deformation has always been
According to the international standard of iso6336-1-2006, the average meshing stiffness of a gear is regarded as the total stiffness
