| World’s energy and environmental crisis spawn the production of structural principle about Gear-l inked cylinders hydraulic engine(GCHE). It uses pinion-and-rack mechanism to complete motion and power transfer between cylinders. The crankshaft flywheel group is arranged on one side to perform the control of piston stroke and the driving of auxiliary systems; GCHE works on the integration of the current technical advantages of fluid engine, which can output fluid pressure energy directly. The GCHE has lighter weight and smaller volume, which can be used for multiple conditions, so it is an industrial prospect as a new power plant.This paper firstly discusses the structure and working principle of the two-cylinder GCHE, then conduct a structural design and reasonable arrangement about the major components of main motion system and the valve system to determine the relative position and movement relationship between them. Based on this situation, the mathematical model as well as the CAD model of GCHE working process is established. Secondly, simulation of the two-cylinder GCHE thermodynamic process is conducted on the basis of AVL BOOST to obtain pressure curve of the gas inside the cylinder in the calibration condition; and then build an accurate and reasonable virtual prototype of GCHE in ADAMS environment. Finally, conducts a dynamical simulation to study the dynamic characteristics of the GCHE.The results show that the motion state of the piston is asymmetric. Take the left cylinder as an example, the maximum speed of the piston downward is 13.96m/s, and the maximum acceleration is 2.64×10.3m/s2 while upward it is 14.32m/s, and 4.78×103m/s2; Using fixed point iteration method to adjust crankshaft angular velocity, when the applied torque is 8.57×102N?mm, the overall crankshaft speed tends to be stable, the running unevenness within a single work cycle is 3.996%, which meets the design. Force on the Crank mechanism is complicated, when upward, the rod small head subject to the maximum tension is 7.33×104N, when downward the maximum stress is 4.80×104N. The tension and compression load trend of the crankshaft journal is the same with the rod small head, but in the opposite direction. Peak loads are 6.57×104N and 4.29×104N respectively. Crankshaft output torque is 4.39×103N?mm to drive other aid agencies. Valve system runs well, and the valve stroke is 11.21 mm, working force corresponding to the Limit position of the valve spring is 1238.88N; On the basis of ADAMS internal contact model, simulates the meshing process of the pinion-and-rack mechanism, whose maximum normal contact force is 8.91×104N, while maximum tangential force is 3.60×104N. Through the simulation of the GCHE virtual prototype, the kinematics and dynamic parameters of the major components in the calibration condition have been obtained, which provides a reference for prototype improvement and structural optimization. |
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