Abstract
In order to solve the oversize problem of continuously variable transmission, a rod gear pulse continuously variable transmission is designed. The kinematic mathematical models of key components are established by the matrix method and are simulated by MATLAB in a single phase, based on the analysis of basic structure and working principle of transmission. Also, the length requirements of each rod are studied, and the effect of three adjustment manners on the output-speed is simulated in the single phase. Furthermore, the simulations of the movement law of annular gear are achieved on two conditions of both different phases and different eccentricities on 8-phase. The results show that the manner of adjusting the eccentricity of eccentric wheel is the preferential selection of out-speed regulating method, and 8-phase is an optimal phase of transmission; meanwhile, for the rod gear pulse continuously variable transmission, the variable range of transmission ratio is wider and the pulsation rate is far less than the other traditional continuously variable transmissions.
Highlights
IntroductionPulse continuously variable transmission (P-CVT) has been regarded as a kind of promising mechanical transmission,[1] but the traditional P-CVT adopts a multiphase linkage as transmission mechanism, so it has many unavoidable disadvantages, such as high pulsation rate, excessive volume of inertia force, oversize.[2,3]
Pulse continuously variable transmission (P-CVT) has been regarded as a kind of promising mechanical transmission,[1] but the traditional P-CVT adopts a multiphase linkage as transmission mechanism, so it has many unavoidable disadvantages, such as high pulsation rate, excessive volume of inertia force, oversize.[2,3]In order to improve the transmission characteristic condition of P-CVT, many researchers have been researching on the gear or combining type transmission mechanism
The above studies have proved that the main speed regulating method is to adjust the eccentricity, and 8-phase is the optimal phase for rod gear P-CVT, so the influence of different eccentricities on transmission ratio and pulsation rate is studied on the premise of the 8-phase
Summary
Pulse continuously variable transmission (P-CVT) has been regarded as a kind of promising mechanical transmission,[1] but the traditional P-CVT adopts a multiphase linkage as transmission mechanism, so it has many unavoidable disadvantages, such as high pulsation rate, excessive volume of inertia force, oversize.[2,3]. The rod gear P-CVT has a combined transmission of eccentric wheel, connecting rod, and ratchet, which adopts multi-phase transmission in a same plane It solves the problems of oversize and excessive volume of inertia force. 1: input shaft; 2: eccentric wheel; 3: rolling bearing; 4: connecting rod; 5: annular gear; 6: swing rod; 7: pin shaft; 8: fulcrum; 9: straight groove. The transmission mechanism of rod gear P-CVT is mainly composed of an input shaft, an eccentric wheel, several connecting rods and swing rods, an annular gear, and so on. Before studying the movement law of the whole transmission, a planar four-bar slide mechanism can be equated with the single-phase according to the principle of high pair replaced by low pair Supposing v1, v2, v4, and v5 are the angular velocities of key parts, and the first-order differential equation in form of matrix is established by taking the first derivative of equation (4), so the matrix equation of angular velocity of all key parts are determined in the single-phase mechanism, as equation (5)
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