The accurate three-dimensional model of variable tooth thickness involute gear enveloping hourglass worm is established. In the five axis linkage […]
The test method usually adopts quasi-static analysis conditions, which can accurately calculate the TVMs of gear meshing pair. In practical
Gear pair 2 is selected to study and analyze the effect of gear geometric parameters on tooth stiffness. The curve
In variable tooth thickness involute gear enveloping hourglass worm gearing, the worm gear is variable tooth thickness involute gear with
Finite element method (fem) is to the gear body and tooth discrete into tiny unit elastic body, and through the
The gear pair parameters are selected for tooth stiffness simulation analysis. The selected gear pair parameters cover two different tooth
In order to further calculate the meshing interval expression of gear in a single period from meshing in to meshing
He et al. extended the two-stage gear reducer dynamics model on the single-stage gear dynamics model, and studied the influence
According to the spatial meshing principle of involute spur gear, when a pair of standard involute tooth profiles are meshed,
Zhou jian magnitude to a gear mesh type bending – twist mechanical model considering the meshing stiffness and error of
According to the theory of mechanics of materials and elasticity, a beam/bar with equal section length of Z is taken
For gear transmission system dynamics by physical model to the transformation of the mathematical model, and to establish the mathematical
The low-speed and heavy-duty gear assembly established by SolidWorks is exported to. Step format and imported into ANSYS Workbench. The
A series of research work has been carried out on the dynamic modeling analysis and dynamic performance optimization of multi-stage
When the cyclic contact stress on the tooth surface exceeds the fatigue limit of the material, a micro crack appears
The accurate modeling of gear is an important basis for analyzing the contact stress and crack propagation law of gear.
① Aiming at the problems of modeling difficulty and low computational efficiency of multi-stage gear system dynamics, an efficient general
Reducing the fluctuation of static transmission error is a well-known tooth profile modification criterion, but in practice, there are not
In the dynamic analysis of gear, the modeling process is very important. With the development of science and technology, there
The research content of gear crack and the research status of gear stress intensity factor at home and abroad are
With the continuous increase of mining depth, the geological characteristics of high ground stress and strong mining disturbance in deep
As shown in Figure 1, it is the contour map of CHTE under different profile modification parameters of gear pair
Under the action of long-term repeated load, gear is easy to produce fatigue microcracks, which leads to the decrease of
In order to solve the problems of dynamic characteristics and crack propagation path of low-speed and heavy-duty gears, the main
The dynamic performance of shearer cutting part is improved from two aspects of rocker box structure optimization and multi-stage gear
It is well known that the optimum amount of tooth direction modification varies with the meshing tooth direction error and
By means of natural vibration analysis and system dynamics simulation, the coupling dynamic characteristics of multi-stage gear transmission and rocker
Adjust the synchronous speed of the motor so that the speed of the motor under rated load can be increased
There are many methods to study the crack propagation of gears. The following summarizes four common methods to simulate the
The crack propagation of gear can be divided into three stages: the first stage, crack initiation stage; The second stage
Adjust the synchronous speed of the motor to 150, 500, 750, 1250, 1470, 1750 and 2000 R / min respectively
The dynamic response characteristics of shearer cutting part under rated working condition are analyzed, and the dynamic deformation and dynamic
Low speed and heavy load gear transmission system is widely used in every lifeline of national economy, such as gantry
Vibration acceleration is the most direct phenomenon caused by the dynamic load of the system. At the same time, the
Shearer cutting part is a rocker gear box. The rocker box is a hollow cantilever structure, the free end of
Fig. 1 (a) and (c) respectively show the dynamic reaction curve of the front and rear bearing 1 of the
In dynamic modeling, the cutting part of shearer is divided into two parts: transmission system and rocker box. The transmission
Fig. 1 (a) and (c) show the dynamic meshing force curves of the front and rear gear pair 1 of
Dynamic modeling is the basis of gear system dynamics research. From the perspective of gear dynamics, the cutting part of
Dynamic load is the direct cause of vibration and fatigue failure of transmission system. Analyzing the dynamic load of each
Shearer cutting part is a multi-stage gear transmission system supported by rocker box, which has many parts and complex structure.
Involute gear has the characteristic that the center distance changes while the transmission ratio remains unchanged, so the center distance
Based on the multi-body dynamics commercial software ADAMS simulation platform and considering the dynamic characteristics of the rocker box and
Figure 1 shows the comparison of the center motion track of the driving and driven gears of the front and
The research on gear dynamics of shearer cutting part started late at home and abroad, and the main achievements were
When shearer cuts coal, the rocker box will produce complex three-dimensional dynamic deformation under the joint action of internal and
Profile modification is to modify the helical angle or axial profile of the gear according to the predetermined law according
The main research contents are as follows: 1) The natural vibration characteristics of the coupled system are solved and the
Profile modification is to remove trace material from the tooth surface along the direction of tooth height, so as to
The bending fatigue test was designed and completed according to GB / T 14230-1993. In the bending fatigue test, according
Firstly, the natural vibration characteristics of the coupled system are solved. By simplifying the dynamic equation of multi-stage gear transmission
The design of gear system is not limited to the static strength check, but the important content is to consider
Multi stage gear transmission is a system composed of cutting motor, cutting transmission system and cutting roller, which is used
It should be noted that the dynamic substructure method is mainly convenient to establish the coupling dynamic model of the
Mode (including natural frequency and mode) is the inherent property of multi degree of freedom system. It describes the natural
Choy et al established the dynamic model of the transmission system by using the transfer matrix method and the dynamic
With the deepening of research and the improvement of computer performance, the research object of gear system dynamics has experienced
Bearing is a standard part widely used in all kinds of mechanical equipment, and it is the key component to
There are some problems in gear meshing excitation modeling ① The time-varying meshing stiffness and static transmission error are scalars
The cutting motor of shearer is squirrel cage three-phase asynchronous motor. The mechanical characteristics of cutting motor refer to the
