Adjusting structure for nozzle of VGT turbocharger

Abstract

The invention provides an adjusting structure for a nozzle of a VGT turbocharger. The adjusting structure comprises a nozzle ring blade adjusting shifting disc and a nozzle ring blade mounting disc; a plurality of grooves are annularly and uniformly distributed in the nozzle ring blade adjusting shifting disc; a through hole or a blind hole is formed in each groove; a plurality of small holes are annularly and uniformly distributed in the nozzle ring blade mounting disc; blade shafts of fixed nozzle ring blades penetrate through the small holes to be arranged in the blind holes; blade shafts of rotary nozzle ring blades sequentially penetrate through the small holes and the through holes to be fixedly connected to shifting forks; the shifting forks are located in the grooves; and a plurality of steel balls are arranged between the nozzle ring blade adjusting shifting disc and the nozzle ring blade mounting disc. According to the adjusting structure for the nozzle of the VGT turbocharger, the end surface contact of the nozzle ring blade adjusting shifting disc and the nozzle ring blade mounting disc in the rotating process can be always point contact, the contact surfaces is reduced, and therefore the nozzle ring blade shifting disc can be conveniently adjusted to rotate, and the service life of the nozzle of the turbocharger can be prolonged.

Description

technical field [0001] The invention belongs to the technical field of exhaust gas turbocharging, and in particular relates to a nozzle adjusting structure of a VGT turbocharger. Background technique [0002] Exhaust gas turbocharging uses the energy discharged from exhaust gas to drive the turbocharger. When the engine speed is low, due to insufficient exhaust energy, the turbine speed and boost pressure drop, resulting in black smoke from combustion, and the temperature of the exhaust gas and parts rise. High, torque characteristics deterioration and other consequences. In order to make the exhaust gas turbocharger meet the requirements of the vehicle's torque adaptability under the condition of low speed and high load of the engine, so that the vehicle diesel engine can obtain a high enough boost pressure at low speed to increase the torque at low speed and high load, it must be The maximum torque operating point is matched in the high-efficiency zone of the compressor, ...

AI Technical Summary

Problems solved by technology

[0002] Exhaust gas turbocharging uses the energy discharged from exhaust gas to drive the turbocharger. When the engine speed is low, due to insufficient exhaust energy, the turbine speed and boost pressure drop, resulting in black smoke from combustion, and the temperature of the exhaust gas and parts rise. High, torque characteristics deterioration and other consequences

In order to make the exhaust gas turbocharger meet the requirements of the vehicle's torque adaptability under the condition of low speed and high load of the engine, so that the vehicle diesel engine can obtain a high enough boost pressure at low speed to increase the torque at low speed and high load, it must be The maximum torque operating point matches the high efficiency zone of the compressor, but this will cause the boost pressure of the engine to be too high at high speed and high load, resulting in supercharger overspeed and cylinder combustion pressure being too high

In addition, due to the inertia of moving parts, the responsiveness of the turbocharger in the low-speed region is very poor, and it is difficult to meet the requirements of vehicles (especially cars) for quick response to transient conditions, that is, in a wide load-speed range Running with random fluctuations, especially poor running performance at part load

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