The core role of gear design in right angle 90 degree planetary drive speed reducer

In the field of mechanical transmission, right angle 90 degree planetary drive speed reducer is widely used in various mechanical equipment with its compact structure, high transmission efficiency and strong load-bearing capacity. As the core component of this type of reducer, the design of gear is directly related to the performance and service life of the reducer. This article will deeply explore the design points of gears in right angle 90 degree planetary drive speed reducer, especially how the design of the number of teeth can meet the requirements of the transmission ratio, and improve the end face overlap by increasing the number of teeth, thereby improving the smoothness of the transmission.

Gear: The soul of the reducer
Gear is one of the most basic elements in mechanical transmission. It transmits power and motion through the mutual meshing of gear teeth. In the right angle 90 degree planetary drive speed reducer, the gear not only undertakes the task of transmitting torque, but also realizes the reduction of speed and the increase of torque through a specific gear ratio. Therefore, the design of gear is a crucial part of the reducer design.

The relationship between the transmission ratio and the number of teeth
The transmission ratio is an important performance indicator of the reducer, which determines the proportional relationship between the input speed and the output speed. In a right angle 90 degree planetary drive speed reducer, the transmission ratio is mainly achieved through the gear ratio between the planetary gear, sun gear and ring gear. When designing, the transmission ratio must first be determined according to the actual needs of the equipment, and then the number of teeth of each gear must be calculated accordingly.

The selection of the number of teeth is not arbitrary. It must meet the requirements of the transmission ratio, and at the same time, the strength, wear resistance and transmission stability of the gear must be considered. Generally speaking, the more teeth there are, the stronger the bearing capacity of the gear, but too many teeth will increase the difficulty and cost of processing. Therefore, it is necessary to find a balance point in the design to meet the requirements of the transmission ratio and ensure that the performance and cost of the gear are controllable.

Increasing the number of teeth to improve the end face overlap
The end face overlap is an important indicator for measuring the stability of gear transmission. It refers to the ratio of the number of tooth pairs that are simultaneously involved in the meshing to the total number of teeth in a pair of meshing gears. The higher the end face overlap, the better the transmission stability and the less noise and vibration.

Increasing the number of teeth is one of the effective ways to improve the end face overlap. For high-speed gear transmission, it is recommended that the number of teeth on the small wheel is greater than 30 teeth. This is because when the number of teeth is small, the meshing frequency of the gear is high, which is prone to noise and vibration. Increasing the number of teeth can reduce the meshing frequency and make the transmission smoother. At the same time, a larger number of teeth can also disperse the load and improve the bearing capacity of the gear.

Special requirements for high-speed gear transmission
For high-speed gear transmission, in addition to meeting the requirements of transmission ratio and end face overlap, the dynamic performance of the gear also needs to be considered. When running at high speed, the centrifugal force, gyroscopic effect and dynamic load of the gear will increase, which puts higher requirements on the strength and stiffness of the gear. Therefore, when designing high-speed gears, more accurate calculation methods and more stringent manufacturing processes are needed to ensure the stability and reliability of the gears.