RU2712937C1 - Test bench for torsional vibration damper testing - Google Patents

Abstract

FIELD: machine building.SUBSTANCE: invention relates to machine building, particularly, to test benches of torsional vibration installed on crankshafts of internal combustion engines. Device comprises a splined shaft mounted on rolling bearings, on which there are at least four rotors and coaxially arranged four stators, with possibility of movement along axis of spline shaft, having excitation windings, connected to alternating current supply pulse system, on one end of splined shaft test object is installed – torsional oscillation damper, and flywheel with variable inertial mass is located on the other end of splined shaft, sensors for registration of torsional vibrations are installed on rotors.EFFECT: broader functional capabilities of the bench and more accurate measurement of torsional vibrations.3 cl, 1 dwg

Description

The invention relates to mechanical engineering, in particular to stands for testing torsional vibration dampers mounted on crankshafts of internal combustion engines.

A known bench for testing vibration dampers of shafts (patent RU 2383879 IPC G01M 7/06, published 10.03.2010) containing a base used to install the tested dampers, a shaft mounted in two bearings, one of which is made in the form of a set of four frames: the central inner - the first, the outer bearing - the fourth, the intermediate - the second, the third, located sequentially one in the other and connected from opposite sides by elastic elements in the form of leaf springs equipped with vibration transducers, liners and an ohm with the possibility of rotation in the liners mounted on the Central inner - the first frame, and connected with the last elastic elements, characterized in that the elastic elements on opposite sides of the second, third, first and second frames respectively are made in the form of two or more pairs, while the lengths of the elastic elements between the third and externally supporting frames are made at least equal to the width of the third frame.

Closest to the proposed solution is a device for the study of torsional vibrations (USSR patent No. 185518 IPC G01H 1/10, publ. 08.13.1966) containing an induction sensor, a drive motor, measuring and recording units, characterized in that, for the purpose of reproduction in the studied object in the process of rotation of forced torsional vibrations of a given shape and frequency, it is equipped with two sensors, each made in the form of two cylindrical coaxially arranged cores, one of which serves as a hundred torus and bears the excitation windings, fed by a modulated three-phase or multiphase current of increased frequency, causing oscillations of the second core - the rotor, rigidly bonded to the controlled object.

However, these stand designs do not allow testing torsional vibrations of crankshafts together with torsional vibration dampers, as well as changing the configuration of crankshafts.

The technical problem to which the invention is directed is to create a test bench for torsional vibration dampers, which allows to eliminate these shortcomings and improve the efficiency of checking torsional vibrations of crankshafts.

The technical result, which the invention is aimed at, is to expand the functionality of the stand and more accurate measurement of torsional vibrations.

The technical result is achieved in that the test bench for torsional vibration dampers contains a shaft mounted on rolling bearings, on which rotors are mounted, coaxially installed stators with field windings connected to an electric current source. What is new is that a test object is installed at one end of the shaft - a torsional vibration damper, a flywheel with a variable inertial mass is located on the other end of the shaft, the stators are connected to a pulsed alternating current supply system, and sensors that record torsional vibrations communicated with analogue sensors are installed on the rotors -digital signal converter, signal amplifier and recording device, in addition, the rotors and stators are installed with the possibility of movement along the axis of the shaft.

At least four of the aforementioned rotors and four stators coaxially mounted thereon are mounted on the shaft. The shaft is slotted. The invention is illustrated in the drawing.

The figure shows a diagram of a stand for testing vibration dampers

Positions in the figure: 1 - spline shaft, 2 - rolling bearings, 3 - flywheel, 4 - inertial masses, 5 - sensors, 6 - stators, 7 - rotors, 8 - torsional vibration damper, 9 - AC alternating current supply system, 10 - analog-to-digital converter, 11 - signal amplifier, 12 - recording device.

The device consists of a spline shaft 1 mounted on rolling bearings 2. A flywheel 3 with a variable inertial mass 4 is installed at one end of the spline shaft 1. At least four stators 6 and rotors 7 acting as electric motors are mounted coaxially on the spline shaft 1, with the possibility of movement along the axis of rotation of the splined shaft 1. The stators 6 are connected to a pulsed AC supply system 9. Sensors 5 recording torsional vibrations are installed on the rotors 7 of the electric motor, transmitting information about the vibrations x to the analog-to-digital converter 10, then the signals go to the signal amplifier 11 and are transmitted to the recorder 12. At the other end of the spline shaft 1, the test torsion damper 8 is attached.

The device operates as follows.

The configuration of the crankshaft is selected. On the flywheel 3 mounted on one end of the spline shaft 1 mounted on the rolling bearings 2, the selected inertial masses are installed. The stators 6 and rotors 7, which act as electric motors, move along the spline shaft 1 at a selected distance from each other. The test bench for torsional vibration dampers 8 is run two times, with and without torsional vibration dampers 8 installed to test the efficiency of damping torsional vibrations on spline shaft 1 with the selected crankshaft configuration. The stators 6 are supplied with electric alternating current, alternately, according to the order of operation of the cylinders, using an AC pulsed supply system 9, which creates a rotating magnetic field, creating a torque that carries away the rotors 7 operating as electric motors. When the spline shaft 1 rotates under the action of a torque, torsional vibrations appear on it. Torsional vibrations, first when working without installing a torsional vibration damper 8, and then are fixed with it by sensors 5 mounted on the rotors 7 and transmitted to an analog-to-digital converter 10, a signal amplifier 11 and a recording device 12. When testing at a torsion vibration damper stand 8 .

Thus, due to the fact that you can choose any configuration of the crankshaft by moving the stators 6 along with the rotors 7 along the spline shaft 1, the functional capabilities of the stand are expanded, and also due to the appropriate selection of inertial masses 4 on the flywheel 3, the accuracy of the obtained data on torsional oscillations of the tested torsional vibration damper 8.

Claims (3)

1. A test bench for torsional vibration dampers, comprising a shaft mounted on rolling bearings on which rotors are mounted, coaxially located stators with field windings, characterized in that a test object is installed on one end of the shaft - torsional vibration damper, on the other end of the shaft a flywheel with a variable inertial mass is located, the stators are connected to a pulsed AC supply system, and sensors are installed on the rotors that record torsional vibrations reported from analog-digital vym signal converter, signal amplifier and the recording device further rotors and stators are movably mounted along the shaft axis. 2. The stand according to claim 1, characterized in that at least four of the aforementioned rotors and four stators are coaxially mounted on the shaft. 3. The stand under item 1, characterized in that the shaft is made spline.

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