Industry news|2022-03-09| admin
When choosing a planetary gearbox, you need to pay attention to the introduction of some parameters of the gearbox. The gearbox is a product with relatively high precision. If the selection is not done well in the process of use, or the size is wrong. It will have a great impact on later installation or use, so what are the parameters of the gearbox that need to be paid attention to in the selection of the gearbox? , Today I will introduce the main parameters and related dimensions of the planetary gearbox.
Return clearance: fix the input end, load ±2% rated torque on the output end, the backlash value generated, the unit arcmin, 1 degree=60arcmin;
Bearing torque: For a gearbox of the same size, the closer the speed ratio is to the middle, the closer the number of teeth of the sun gear and planetary gear, and the greater the bearing torque.
Allowable radial force and axial force: depends on the bearing at the output end of the gearbox;
Torsional stiffness: the deflection angle of the elastic deformation of the output end of the gearbox when it bears external torque, in Nm/arcmin;
Running noise: The industry standard is measured when the distance from the gearbox is 1 meter, the input speed is 3000rpm, and there is no load;
Service life: which conditions correspond to 20000h and 30000h respectively;
Operating temperature range: generally -25 ~ +90 degrees Celsius;
full load efficiency
allowable input speed
The internal structure of the planetary gearbox: the general one-level planetary gearbox contains:
5 gears: 1 sun gear, 3 planetary gears, 1 internal gear;
6 bearings: 1 ball roller bearing at the input end, 2 ball roller bearings (economical type) or 2 tapered roller bearings (high precision type) at the output end, each of the three planetary gears and the planet carrier uses rollers Needle bearing connection.
The planetary gearbox has a gear with a fixed axis position called a sun gear, and a gear with a variable axis on the side of the sun gear is called a planetary gear, which both rotates and revolves. The supporting member of the planetary gear is called a planetary carrier. It is transmitted to the shaft, and then to other gears;
The input and output of the planetary gearbox rotate in the same direction;
The planetary gearbox generally has a minimum single-stage reduction ratio of 3 and a maximum of 10. Common reduction ratios are: 3, 4, 5, 7, 8, and 10.
It is necessary to pay attention to the above problem, mainly because these key parameters can really judge the quality of a gearbox