Edge detection of helical gears based on Canny operator
The edge of an image is generally the transition area between the target and the environment, which is an area […]
The edge of an image is generally the transition area between the target and the environment, which is an area […]
Due to the unique tooth shape of helical gears, background noise is inevitably generated during the image scanning process, which
Under ideal oil-lubricated meshing conditions, the big and small gear teeth will be completely separated by the oil film. At
The helical gear pair in the reduction box of electric vehicle is in oil lubrication state. The thicker the oil
As shown in the figure, the transmission error curve of helical gear with no modification, no 1 optimization and no
During the process of collecting and processing helical gear images, external interference may cause a decrease in image quality. To
(1) Optimized profile modification of large and small gears+drum profile modification of tooth direction Figures 1, 2, 3, 4 and
The overall hardware of the helical gear detection system mainly consists of an industrial camera, a telecentric lens, a light
To evaluate the accuracy and reliability of the helical gear parameter detection method, five sets of standard helical cylindrical gears
Figures 1, 2 and 3 show the drum shape modification of the big and small gears at the same time,
Gears, as an important component, have always played a huge role in human production and life. Effective detection of various
The figure shows the maximum value Max (u) of dimensionless vibration displacement u and the minimum value Min (v) of
(1) Linear addendum optimization of long tooth profile Figures 1, 2 and 3 show the linear tooth top modification of
Figure 1 shows the dimensionless vibration displacement u and v of p, g tooth pairs, and q, g tooth pairs
(1) Selection of long and short shaping methods Long modification refers to the repair and removal of the part from
Generally speaking, the coincidence degree of a helical gear system is greater than 2, and the continuous gradual involution of
Due to the existence of helical angles, the meshing stiffness of helical gears not only varies with the variation of
(1) Influence of pinion tooth width on transmission error of helical gear Figure 1 shows the relation curve between the
The physical model and simplified torsional vibration model of a rigid supported dual input single output helical gear system without
The dual input single output helical gear transmission system is an important component of ship power propulsion equipment. Based on
Figure 1 shows the dimensionless vibration displacement u and v of p, g tooth pairs, and q, g tooth pairs
Due to the layout structure of dual input single output helical gears, as shown in Figure 1, the meshing process
(1) Influence of Gear Tooth Width on Transmission Error of Helical Gear Figure 1 shows the relationship curve between the
Due to the varying degrees of degradation of the meshing stiffness of helical gears at different meshing stages, it is
The dual input single output helical gear transmission system under asymmetric loads has become an important structure in the power
(1) Influence of Helical Angle on Transmission Error of Helical Gear Figure 1 shows the relationship curve between the helix
1. Crack propagation path Although there is uncertainty in the location and propagation path of cracks in helical gears, research
Although the vibration characteristics of high-speed helical gear transmission of an electric vehicle reducer have been studied, some conclusions with
Transmission error refers to the deviation between the actual output angle and the ideal angle of a helical gear along
The misalignment of helical gear meshing is a key factor affecting the stability and lifespan of the helical gear pair
Helical gears are the core components of automotive transmission systems. The transmission performance and meshing characteristics of helical gear systems
Taking the high-speed helical gear transmission of an electric vehicle reducer as the research object, firstly, the time-varying meshing stiffness
Figure 1 shows the time-varying meshing stiffness of helical gear pairs with through cracks of different depths. By calculating the
The average efficiency formula of helical gear meshing transmission is derived by using the integral method, and the average efficiency
Miner’s linear cumulative damage rule believes that under the repeated action of a given stress level, the damage and stress
The S-N curve of the target helical gear is obtained from the S-N curve of the helical gear material, which
The essence of the cycle counting method is to study the number of the occurrence of the basic damage element
According to practical experience, contact fatigue often occurs in transmission gears. The table shows the basic parameters of the high-speed
In order to further study the impact of different factors on the tooth surface wear of involute helical gear transmission
Helical gears are widely used in high-speed and heavy-duty applications due to their advantages such as smooth transmission, large coincidence,
Helical gear transmission passes through 1 × The cumulative wear depth distribution of the driving and driven gear tooth surfaces
The distribution of relevant meshing characteristics of the involute helical gear transmission system is shown in the figure. From Figure
During the meshing transmission of helical gear pairs, sliding wear occurs due to the relative sliding of the tooth surfaces.
Tooth width and helix angle are the main parameters that affect the time-varying contact line of helical gears. Figure 1
Tooth surface roughness and lubricating oil viscosity are the main factors that affect the friction coefficient of tooth surface. Through
With the same parameters, the average meshing efficiency obtained is compared with the results as shown in Figure 1. It
The instantaneous meshing efficiency of helical gears is defined as: Where, Tp and Tg are the torque of main and
In the process of helical gear meshing, the friction coefficient of tooth surface will change significantly with the change of
As shown in Figure 1, the length of the contact lines on the left and right sides of the pitch
It can be seen from Figure 1 that the relative sliding directions on both sides of the pitch line on
According to the meshing principle of helical gears, when a pair of helical gears enter into meshing and exit from
Create a new assembly model in UG software, select “Add Part”, import the driving wheel and driven wheel, add the
Tooth friction is the main factor affecting the vibration noise and power loss of helical gear transmission system. It will
In order to qualitatively study the influence of meshing impact time on the vibration characteristics of helical gear transmission, the
In order to study the vibration characteristics of the system under separate excitation of meshing impact, the meshing impact curve
Input the obtained time-varying meshing stiffness curve into the dynamic equations, obtain the vibration response of single-stage helical gear transmission
The calculated vibration accelerations in all directions of the helical gear are combined into “relative vibration accelerations a in the
Based on the multi-body dynamics, statics and acoustics of the reduction box and gear system of the electric vehicle, the
(1) At present, domestic and foreign research on the helical gear modification technology is almost concentrated on the simultaneous tooth
The optimal modification scheme of the addendum involute of the long tooth profile is the modification amount of the driving