Device and method for detecting dynamic torque of turbocharger shaft locking nut

Abstract

The invention belongs to the technical field of turbocharging, and particularly relates to a device for detecting dynamic torque of a turbocharger shaft locking nut. The device comprises a to-be-detected workpiece and a detection station, and the to-be-detected workpiece comprises a turbine impeller, a gas compressor impeller and a turbocharger intermediate; the detection station comprises a driving motor and a braking motor, the connecting shaft flange is in frictional contact with the compressor impeller through a pressing cushion, a shell of the braking motor is connected with a torque sensor, and the driving motor and the braking motor are electrically connected with a control unit through a controller. The detection method comprises the following steps: 1, mounting the to-be-detected workpiece on the detection station; 2, starting an oil supply pump to pump lubricating oil into the supercharger intermediate; 3, starting the driving motor to drag the brake motor, and starting detection; 4, after detection is finished, closing the oil supply pump, and starting the purging pump; and 5, dismounting the detected workpiece to complete detection. By testing and simulating the actual working state of the turbocharger shaft and effectively detecting locking failure pieces, safety accidents and economic losses caused by potential defective pieces are prevented.

Description

technical field [0001] The invention belongs to the technical field of turbocharging, and in particular relates to a dynamic torque detection device and method for a locking nut of a turbocharger shaft. Background technique [0002] The turbocharger uses the inertial momentum of the exhaust gas discharged from the engine to drive the turbine in the turbine chamber, and the turbine drives the coaxial impeller. The impeller presses the air sent by the air filter pipe to pressurize it into the cylinder. As the pressure and density increase, more fuel can be burned, and the amount of fuel can be increased accordingly and the speed of the engine can be adjusted, thereby increasing the output power of the engine. [0003] The rotor shaft of the turbocharger is used to transfer the power output from the turbine blades to the compressor blades. The mandrel rotates at a high speed and the working environment is harsh, and the rotating speed can usually reach 250,000 to 300,000 revol...

AI Technical Summary

Problems solved by technology

First, the system cannot detect the abnormal tightening torque caused by thread processing tolerances. When the interference of the thread fit is large, there may be cases where the tightening is not in place; The false torque caused by the fit tolerance of the sub-hole, when the fit interference is large, the preloading of the compressor wheel rotor may not be in place, which will cause false torque when the lock nut is tightened, or the locking torque Less consistent, the end result is still the same as the compressor wheel not being finally locked

Third, if the tightening torque is too large, there is a risk of exceeding the allowable stress of the shaft, which will lead to premature fatigue fracture of the mandrel

Images