Magnetorheological torsional vibration damper for engine

Abstract

The invention discloses a magnetorheological torsional vibration damper for an engine. The damper is characterized in that: an inertia disc is arranged in an annular shell; an antifriction lining is arranged at the outer end of the inner circumference of the annular shell, and the inertia disc can rotate freely around the antifriction lining in the annular shell; a conductive coil is arranged in the inertia disc; magnetorheological fluid is filled in a gap between the annular shell and the inertia disc; a lead wire is connected with the antifriction lining; and the lead wire is exported from the center of the damper through an insulating conduit of the annular shell. By utilizing the characteristic that the conductive coil is electrified and generates a magnetic field to control flowing of the magnetorheological fluid, the rotation damping force of the damper can be adjusted, so that the defect that the damping coefficient of the traditional silicone oil torsional vibration damper can only be a single damping coefficient is overcome. The external magnetic force is changed by changing the volume of current, so that the damping characteristic of the magnetorheological fluid is changed. Therefore, the magnetorheological torsional vibration damper has excellent damping effect when a crankshaft is resonant, and has better damping effect than that of the silicone oil damper under other frequencies.

Description

technical field [0001] In particular, the invention relates to a shock absorber for reducing torsional vibration of an engine crankshaft. technical background [0002] As we all know, the crankshaft of the engine will produce unavoidable torsional vibration during operation. This vibration will damage the machinery and equipment, and even cause fatigue failure of the crankshaft or drive shaft, especially in high-speed, high-pressure engines. The situation is more serious. Although the torsional vibration intensity of some engine shaft systems does not reach the level of breaking the crankshaft, the torsional deformation of the crankshaft has caused the peeling and burning of the main bearing bush, and even the damage of the timing gear or other transmission accessories. In addition, the torsional deformation of the crankshaft will also increase the engine noise. Therefore, reducing the torsional vibration of the crankshaft is an urgent problem to be solved in the design of ...

AI Technical Summary

Problems solved by technology

The main principle is to reduce the vibration amplitude of crankshaft resonance according to the natural frequency of the crankshaft. The damping characteristics of the shock absorber are not adjustable, and when the engine is running at other frequencies than the resonance frequency, the shock absorber with fixed damping characteristics will be Less than optimal vibration damping

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