As a common reduction device, planetary gear reducer is widely used in various fields, such as machinery manufacturing, automated production lines, robots, etc. When designing a planetary gear reducer, one of the important parameters is the speed ratio. This article will reveal the calculation method of the speed ratio of the planetary gear reducer to help you accurately design the ideal transmission scheme.
What is a gear ratio: The gear ratio is the ratio between the rotational speed of the input shaft and the rotational speed of the output shaft. It determines the relationship between the rotational speed of the input shaft and the rotational speed of the output shaft, thus controlling the rotational speed of the deceleration device.
Calculation method of planetary gear reducer speed ratio:
The speed ratio of the planetary gear reducer is the ratio of the speed of the output shaft to the speed of the input shaft. In the planetary gear reducer, three key parameters are mainly considered: the number of teeth of the sun gear (s), the number of teeth of the planetary gear (p), and the transmission ratio of the sun gear and the planetary gear (r).
The formula for calculating the ratio is as follows: Ratio = (1 + s) p * r
Wherein, S is the number of teeth of the sun gear, P is the number of teeth of the planetary gear, and R is the transmission ratio of the sun gear and the planetary gear.
For example, taking a planetary gear reducer as an example, the number of teeth of the sun gear is 20, the number of teeth of the planetary gear is 40, and the transmission ratio of the sun gear and the planetary gear is 3. Then the ratio is calculated as follows: ratio = (1 + 20) 40 * 3 = 45
The speed ratio calculated above indicates that for every 1 revolution of the input shaft speed, the output shaft speed is 45 laps.
Adjust the speed ratio according to the desired speed:
In practice, depending on the desired output speed, the ratio can be adjusted. For example, if you need to have a stronger deceleration effect and a slower output speed, you can increase the sun gear or reduce the number of teeth of the planetary gear. Conversely, if you need to increase the speed more and output faster, you can reduce the sun gear or increase the number of teeth in the planetary gear.
The speed ratio is an important parameter in the design of planetary gear reducer, which determines the speed relationship between the input shaft and the output shaft. By accurately calculating the gear ratio, you can design a drivetrain solution that meets your needs. Of course, according to the actual needs, it can also be adjusted twice to achieve more precise speed requirements.