A crankshaft bending torsion composite load test device

Abstract

The invention discloses a crankshaft bending torsion compound load test device. It is supported by a bench, in which there are slide rails, hangers, bending fixtures, torsion fixtures, exciters, motors, eccentric wheels, and electric control cabinets (including power amplifiers, function generators, and dynamic strain gauges). The device lifts the torsion fixture and the bending fixture through the sling and the slide rail, and fixes the crankshaft sample through the bending fixture and the torsion fixture to obtain a suitable test position on the bench. The crankshaft applies pulsating torque, and the motor and eccentric wheel drive the bending fixture to apply alternating bending moments to the crankshaft. During the test, the frequency and amplitude signals are set, and the vibration exciter and motor output are driven through the signal generator and power amplifier, so that the crankshaft is forced to vibrate. After resonance is achieved, the output power is further adjusted, the vibration frequency is changed, and then judged by the strain gauge data Analyze the fatigue strength of the crankshaft.

Description

technical field [0001] The invention relates to a crankshaft bending and torsion composite load test device, in particular to a crankshaft bending and torsion composite load test device which can independently apply pulsating torque and alternating bending moment to the crankshaft at the same time to carry out the crankshaft fatigue simulation test. Background technique [0002] At present, the known structure of the crankshaft bending and torsion test bench is formed by connecting a support stand, a hanger, a bending fixture, a torsion fixture, an exciter, and an electric control cabinet. Through the excitation signal generated by the exciter, the vibrating rod drives the bending fixture and the torsion fixture to apply pulsating bending moment and torque to the crankshaft. However, under the actual stress state of the crankshaft, the torque is a pulsating load and the bending moment is an alternating load. The alternating bending moment load cannot be generated only by the...

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the deficiency that the existing crankshaft bending and torsion test bench cannot apply alternating bending moment loads, the present invention provides a crankshaft bending and torsion composite load test device, which can not only pass through the vibration exciter and the vibrating rod Pulsating torque can be applied, and alternating bending moment can be applied through the motor and eccentric wheel device to achieve an effect closer to the real force of the crankshaft

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