The double mass flywheel with viscous grease damping and long spiral spring structure has extremely low angular stiffness, simple structure and excellent performance. It uses the viscosity of the grease to dampen and at the same time lubricates the long coil spring. Due to the long spring length, the mass of the two mass flywheels has a relatively large torsion angle. As for 66°, the angular stiffness of the spring is very low, and the effect of buffering and noise reduction is better. The torsional vibration damper has a large spring inner sleeve small spring to form a sub-spring, forming a secondary stiffness. When the system transmits a low torque, the large spring works alone, the rigidity is very low, and the vibration can be well buffered; when the system transmits When the torque is large, the large spring compresses and deforms to a certain angle, and the large and small springs work at the same time, ensuring that all torque can be transmitted within a limited range of relative rotational angles, thereby avoiding the impact phenomenon of the system at high load. Although this dual mass flywheel is already in use, no analytical articles have been found. This paper attempts to systematically analyze the dual mass flywheel of this structure.
The elastic characteristics of the torsional vibration damper play a decisive role in the performance of the dual mass flywheel. Therefore, the analysis of it is the basis for establishing the dual mass flywheel simulation model and the basis for analyzing the performance of the dual mass flywheel. For a dual mass flywheel with a long helical spring structure, it is attributed to the analysis of the elastic properties of a single long coil spring.
The deformation of the arc-shaped spring is constrained by the slide rail, and it is a lubrication state, and the friction force is small, so the frictional force can be disregarded; in the ideal state, the spring is uniform, and the deformation of each section is the same when the force is not applied; When any section of the long coil spring acts alone, its curvature is extremely small, so it can be regarded as a single straight spring; thus, the above three basic assumptions are reasonable. Since the spring is uniform, the deformation of each section is the same after the force is applied without friction. It can be considered that the torque transmitted by each section of the spring is the same (similar to the force transmitted by the sections of the straight coil spring), that is, the torque transmitted by each section spring. Both equal the engine output torque T.
Since the torsion test bench for testing can only achieve ±21°, the experimental friction curve is fitted and expanded to generate a simulated friction curve during the actual simulation. The simulated torque-rotation curve is the torque-rotation curve of the system with frictional force. The average elastic value curve can be obtained. The elastic characteristic curve of the frictionless flexible body spring is the flexibility of the spring with ANSYS. After the body, only the two ends are connected to the hub disk and the main flywheel shell to obtain the elastic characteristic curve. In the actual working process of the dual mass flywheel, the relative flywheel rotation angle of the main flywheel can only be positive, so the simulation process does not consider the reverse loading test. The simulation curve and the test curve in the figure are in good agreement, indicating that the simulation model is correct. It is reasonable to use the ADAMS torsional damper model to simulate the curved spring.
The conclusion is derived from the theory, and the design formula of the elastic characteristics of the long coil spring is obtained. The simulation analysis is carried out by ADAMS. It is proved that the double mass flywheel with the long coil spring structure torsional damper can significantly improve the torsional vibration characteristics of the system and avoid the idling resonance. It is of great practical significance to reduce the torsional vibration and torsional vibration control of vehicles. Using the ADAMS spring damper model can quickly establish a practical system model, virtual prototype simulation analysis, which greatly shortens the product development cycle, is a desirable method.
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