Analysis Of Dynamic Characteristics Of The Power Transmission Equipment Of A Differential Rotor Engine

Slot-and-crank mechanism is usually used as the power transmission equipment of traditional reciprocating engine, which leads to a range of problems to the engine, such as low efficiency, powerful vibration and large noise. Considering the limitation of traditional crank, we use a planetary gear linkage as the power transmission equipment of the differential rotary engine in this paper. The dynamic characteristics of this new power transmission equipment are analyzed in order to find its dynamic performance or application prospects, and lay the theoretical foundation for its correlative performance analysis and engineering design. The main study conducts in turn of kinematic analysis, static analysis and kineto-static analysis of the power transmission equipment.(1) Kinematic analysis. The kinematic model of power transmission equipment composing of two sets of planetary gear linkage is established, and is respectively solved and analyzed under different forms of movement after the design of the structure parameters. Besides, several parameters of the kinematic performance of the engine are analyzed. The results show that the rotors have the feature of instantaneous stop, which satisfy the fixed-point gas port requirement of the differential rotary engine; there is a big impact of the movement in the extreme position.(2) Modeling and analysis of transmission characteristics. The concept of torque transmission angle is proposed so as to promote the concept of traditional transmission angle to the special condition of that there are forces at both ends of the output component, and is used for the analysis of the transmission characteristics of the whole power transmission equipment. The results show that: the torque transmission angle is very effective to the condition of multi-force on the output component; there are no dead points of the power transmission equipment, though the torque transmission angle is small.(3) Kineto-static analysis. The kineto-static model of power transmission equipment is establish by using Newtonian mechanics and the Euler equations, and is respectively solved and analyzed under the case of a constant output torque and the case of an ideal explosion after giving the output shaft a uniform rotational velocity. Besides, the strength of the planetary gear and the output shaft of the power transmission equipment are analyzed. The results show that: the constraint forces appear a relatively large fluctuation and big impacts in the extreme position under the case of a constant output torque; the condition of constraint forces is improved though there are still impacts in the extreme position under the case of an ideal explosion.(4) Dynamic simulation. The virtual prototype model of the power transmission equipment is established by using Adams. The condition of the motion and the force of each component are respectively obtained through simulation of kinematics and dynamics, and compared with the previous theoretical results. The results show that: the theoretical model is basically consistent with the virtual prototype simulation model.