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Power shunt and closed power flow If the closed chain closes the differential ratio negative edge (a), in the differential gear train, there is no power flow between the two components, and the external power flows only through the external closed chain parallel thereto Another component forms a power split. Its characteristic is that it is first decomposed at the input end, and the two channels are separately flowed to the output end for synthesis and then output. If the closed chain closes the differential ratio positive edge (b), the two form a closed loop, and the power flow flowing through the positive edge will flow back through the closed chain, causing part of the power flow to circulate continuously during it, called Closed power flow. It will increase power consumption and reduce efficiency, so this situation should not be used in this motion system.
It is a closed planetary gear train and is a negative mechanism (iHab=-zb/za<0). If the motion is input by the wheel a and output from the tie rod H, the closed chain formed by the fixed axle train agb closes the negative side of the output end, and its closed chain transmission ratio iHb=-zb/za<0. Since iaHb=-iHab /(1-iHab)>0, the differential ratio of the closed edge is aHb=iaHb/iHb<0, so the other two differential ratios are positive (a), which is the motion decomposition, which can realize power shunting, so each The part size can be smaller. In the range of ibHiHab, taking ibH=iHab, the reduction gear ratio iaH=1-(1-ibH)iHab(7) can obtain the maximum value. A large reduction ratio transmission such as a turboprop final drive is designed according to this principle.
If the closed chain is changed to a fixed-axis train with secondary external meshing (or no external meshing), since ibH>0, aHb>0; and iaH>0, then iab=iaHiHb>0, then Hab=iHab /iab<0, the closed chain closes the differential ratio positive edge (see b), indicating that components a, b are active. At the output end H, part of the output motion is fed back to the wheel b via the closed chain, and then combined with the motion sent from the input end in the differential gear train before being output. At the same time as the motion feedback, a closed power flow will occur.
Zone B, power reflow, reverse motion. The closed chain transmission ratio of 0iHab/(iHab-1) is required. There is feedback motion, and as such, the output motion of this mechanism is greater than the planetary gear train of the same parameter iHab. When the two center wheels a and b are closed, the motion is still input by a, H output, the output motion formula is as shown in equation (9), iHa and iba are linearly increasing the function relationship (b), and all the straight lines of different structural parameters iHab are passed through iHa. =1, iba=1 point; the larger the |iHab| is, the larger the slope will be, and the larger the reduction ratio will be; the point of iHa=0 will be closer to the zero point of iba=0 (planetary train), and the range of zone B will be The smaller.
Conclusion The core problem of designing a closed 2KH gear mechanism is to determine the sign and size of the closed chain gear ratio according to the power flow direction, and the structural parameter iHab so that the output motion meets the required working range. Therefore, the use and guidance of the design is the most simple and accurate. The power flow direction can be conveniently determined by using the triangular structure diagram, and the power distribution of each branch is calculated according to the magnitude of the differential ratio of each side. It must be pointed out that the input and output components of the same mechanism are interchanged, and the composition and motion characteristics of the mechanism will also change.