Turbocharger with double ball bearings

Abstract

The invention discloses a turbocharger with double ball bearings, which comprises a rotor spindle with a turbine and an impeller, an intermediate body and a diffusion board, wherein the rotor spindle is supported by a first bearing and a second bearing to be arranged in the intermediate body; the first bearing and the second bearing are mixing angle contact ceramic ball bearings; a distance spring housing is arranged between the first bearing and the second bearing; a spring is arranged in the distance spring housing; a fuel feed hole is arranged on the intermediate body; a fuel feed locating pin is arranged on the fuel feed hole; and the fuel feed hole is connected with a lubricant passage communicated with the distance spring housing. The turbocharger with double ball bearings has the advantages that the structure is simple; the starting response speed is accelerated; the acceleration performance, the kinaesthetic and the operating feeling of vehicles can be greatly improved; and the requirements on lubricating oil are low and the actual life is enhanced because the friction of the ball bearings is less.

Description

technical field [0001] The invention relates to a turbocharger, in particular to a double ball bearing turbocharger. Background technique [0002] The turbocharger is driven by the exhaust gas from the engine, not only has a high working temperature, but also has a very high rotor speed, which can reach more than 100,000 revolutions per minute. Such a high speed and temperature make common mechanical needle roller or ball bearings unable to work for the rotor. Therefore, at present, exhaust gas turbochargers generally use full-floating bearings, which are lubricated and cooled by engine oil. Full-floating bearings are shafts and bushings. There is a certain radial gap between them, and the rotor is floated by a certain pressure of lubricating oil. The rotor support of the supercharger adopts the inner support type. The fully floating shaft is in the intermediate body between the two impellers. Usually, there are two floating bearings supported at both ends. The axial force ...

AI Technical Summary

Problems solved by technology

The supercharger with full floating bearing structure has a shortcoming, which is the hysteresis of supercharging. The reason for this is that the inertia and friction of the supercharger rotor make it slow to respond to the sudden change of the vehicle's throttle, so that The engine delays to increase the output power, which is specifically reflected in the sudden acceleration or overtaking, and there will be a feeling of lack of power in an instant. At the same time, due to the large friction of the floating bearing, the service life is short and the requirements for lubricating oil are high.

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