Squeeze film damper for rolling bearing turbochargers

Abstract

The invention belongs to the field of superchargers for internal combustion engines, in particular to a squeeze film damper for rolling bearing turbochargers. The squeeze film damper comprises lubricant, a midbody, a locating pin and a bearing bush in a rotor system, the bearing bush is fixed in the bore of the midbody by the locating pin, a gap is arranged between the bearing bush and the midbody, the locating pin is hollow, the hollow part of the locating pin is used as a main lubricant passage, the midbody is provided with a branch lubricant passage, the main lubricant passage communicates with the branch lubricant passage, the branch lubricant passage communicates with the gap, the lubricant is pressure lubricant, and the pressure lubricant enters the gap from the main lubricant passage and the branch lubricant passage to form an oil film which can support the rotor system. The squeeze film damper has the advantages that: the squeeze film damper can absorb vibration, guarantee the stable operation of a rotor and greatly decrease the operating vibration of a turbocharger, consequently, the service life of the turbocharger can be prolonged, and the reliability of the turbocharger can be enhanced.

Description

technical field [0001] The invention belongs to the field of turbochargers for internal combustion engines, in particular to a squeeze oil film damper for a rolling bearing turbocharger. Background technique [0002] As is well known, a turbocharger is a device for supplying air at a pressure above atmospheric pressure (boost) to the intake of an internal combustion engine. A conventional turbocharger basically consists of an exhaust gas (exhaust) driven turbine wheel mounted on a rotatable shaft within a turbine housing engaged downstream of the engine outlet manifold. Rotation of the turbine wheel turns the compressor wheel mounted on the other end of the shaft inside the compressor housing. The compressor wheel delivers compressed air to the engine intake manifold. The turbocharger shaft is typically supported by bearings located within a central bearing housing engaged between the turbine and compressor wheel housings. [0003] A turbocharger is actually a special kin...

AI Technical Summary

Problems solved by technology

However, studies have shown that if rolling bearings are directly used as supports, the vibration of the rotor system will be relatively large, and the operation will be unstable, resulting in a very short service life of the entire turbocharger

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