What is the range of the transmission ratio of the two stage spur gear reducer?
Coaxial reducer input shaft and the output shaft in the same axis, the body length is shorter. But this kind of reducer the axial dimension of the cylindrical gear reducer. In all the most widely used device. Deceleration transmission power can range from small to 40 000kW, the circumferential velocity can also be from very low to 60m/s a 70m / s, even up to 150m / s. drive power large reducer best dual drive type or center drive type. This two kinds of layout can be composed of two pairs of gear pair share the load to improve the stress condition and reduce the transmission size. The design of double drive type or center drive type gear take, should try to make the automatic balance device of gear pair load can obtain uniform distribution, such as the use of sliding bearing and elastic support. The cylindrical gear reducer with involute and circular arc tooth shaped two categories. Besides the different tooth shape, the basic structure of the reducer The same as the transmission power and transmission ratio, the size of the gear reducer in the length direction is about 30%. than that of the involute gear reducer
2) input torque should be far from the gear shaft, in order to reduce the uneven distribution of load along the tooth width; 3) using helical gear arrangement, and the loading of large low level and located just between two bearings, so the load distribution along the tooth width obviously than the expansion. The high speed gear of the reducer the commonly used helical gear, one side is left-handed, the other side is right, the axial force can offset each other. In order to make about two of the gear can be automatically adjusted to equal the load transfer, the lighter axle should be able to do a small walk in the axial direction.
When the transmission ratio is below 8, the single cylindrical gear reducer. More than 8, the best selection of level two (i=8 - 40) and grade two (i>40) of the reducer. Single stage reducer transmission ratio is too large, the overall size will be large. The type of transmission two and more than two cylindrical gear reducer with expansion, split and coaxial number. Expansion of the most simple, but not because of bearing gear on both sides of the symmetrical arrangement, which will make the load along the tooth width and the distribution is not uniform, so that both sides of the bearing force range. Therefore, in the design should pay attention to this reducer: 1) shaft stiffness should be bigger
