06.20
2024
Gear Classification and Application
When designing equipment, engineers often use the arrangement of shafts to classify gears, so that they can be classified and analyzed by applying the characteristics of gears that can transmit any direction (parallel, intersecting, staggered), and select the appropriate gear transmission type corresponding to different working conditions.
06.20
2024
Gear-shaped electric push rod introduction and selection need to know
The large stroke of the telescopic tube does not exceed 7 meters, generally speaking, in order to maintain stability, it does not exceed 2.5 meters.
06.20
2024
Gear displacement is divided into positive displacement and negative displacement
Tooth profile change by positive displacement. The tooth thickness of the teeth increases, and the outer diameter (addendum diameter> also becomes larger. The gear can avoid the occurrence of undercut (Undercut) by adopting positive displacement. The gear shift can also achieve other purposes, such as changing the center distance, positive shift can increase the center distance, negative shift can reduce the center distance.
06.20
2024
The tooth profile, tooth pitch, tooth line accuracy, etc. described by us are all methods for evaluating the accuracy of the gear unit. On the other hand, there is also a two-tooth surface meshing test method for evaluating the accuracy of the gear after the gear is meshed with the measuring gear. The left and right tooth surfaces of the tested gear are in contact and mesh with the measuring gear and rotate for a whole cycle. The change in center distance was recorded. The following figure shows the test results of a gear with 30 teeth. There are 30 wavy lines for the radial comprehensive deviation of a single tooth. The total radial deviation value is approximately the sum of the radial runout deviation and the single-tooth radial deviation.
06.20
2024
The commonly used gear tooth profile is the involute tooth profile.
Wrap a string with a pencil tied at one end around the circumference of the cylinder, and then gradually release the string while the string is tight. At this point, the curve drawn by the pencil is the involute curve. The outer circumference of the cylinder is referred to as the base circle.
06.20
2024
Gears are generally divided into three categories
There are a wide variety of gears, and their classification is usually based on gear axiality. It is generally divided into three types: parallel axis, intersecting axis and staggered axis.
06.20
2024
Gear also has a long history in our country. According to historical records, gears have been used in ancient China as far back as 400-200 BC. The bronze gears unearthed in Shanxi, China, are ancient gears that have been discovered so far. As a guide to reflect the achievements of ancient science and technology, it is a mechanical device with gear mechanism as the core. The Italian Renaissance in the second half of the 15th century, the all-round Leonardo. Leonardo da Vinci, not only in culture and art, but also left indelible achievements in the history of gear technology. After more than 500 years, the current gear still retains the prototype of the sketch at that time.