SU1048353A1 - Internal combustion engine testing stand - Google Patents

Abstract

1. TEST BENCH FOR AN INTERNAL COMBUSTION ENGINE containing a load device, a base, two pairs of racks, a frame with a frame, an auxiliary engine with a control unit and a rotation speed ddtchik with a converter, and the racks are located on the base. the suspension is located on one pair of racks, and the load device is balanced on another pair, characterized in that, in order to increase efficiency by bringing the test conditions to operational, the stand additionally contains a suspension swing mechanism, and the latter is placed on the struts balanced, and the axis the noipBecki's swing coincides with the axis of the crankshaft of the engine under test, the auxiliary engine is connected to the suspension through the swing mechanism, and the control unit is connected via a converter to the frequency sensor ascheni 2. The stand according to claim 1, is different from the fact that the mechanism ka (L chani suspension is made in the form of an eccentric, a mechanism containing a right-sided groove and an eccentric, the latter being associated with an auxiliary (engine and groove made in the frame of the suspension. S I-

Description

The invention relates to testing equipment, in particular, ladies for investigating friction and wear processes in internal combustion engine (ICE) units, and can be used in mechanical engineering to assess the workability and wear resistance of new or reconditioned worn parts and interfaces of ICE

There are known stands for testing an internal combustion engine containing a load, a first device, a base, two pairs of struts, a frame, the stands being placed on the base, the load unit being balanced on a pair of supports II.

In such stands, an electric machine is made balanced and is a sophisticated modification of machines of the general industrial type. The power of the internal combustion engine is determined on such stands based on measurements of torque and speed using a weight mechanism and a speed sensor.

However on. The well-known stands of the drive system with water and wire resistors do not allow us to simulate highly dynamic modes of loading, which correspond to the real stress conditions of operation, which reduces the efficiency of the tests.

There are stands for testing an internal combustion engine containing a load device, a base, two pairs of racks, a suspension with a frame, an auxiliary engine with a control unit and a rotational speed sensor with a converter, with the racks placed on the bases, the suspension on one pair of racks, and the loading device - balanced on another pair.

Such stands may contain a vibration exciter. The mode regulator of which interacts with the control element of the ST.

However, the tests on a stand equipped with a vibration exciter do not quite correspond to the most severe operating conditions of the double drive. When a vehicle travels on a rough road, the wear and reliability of the mating parts, along with vibrations, are even more affected by variable torque. The vibration exciter mainly causes the engine to vibrate in a vertical plane and does not contribute to the creation of variable torques. The dependence of the vibration frequency of the vibration exciter from the position of the fuel pump rail also does not correspond to the actual working conditions. The natural frequency of oscillation of the engine is determined by the movement

pistons and depends on the speed of rotation of the crankshaft / shaft. The speed of rotation of the shaft is determined by both the fuel consumption (the position of the fuel pump rail) and the value

applied moment of resistance.

Such stands do not provide for the possibility of disassembling and adjusting the crankshaft-and-connecting rod mechanism without removing the engine from the stand, which complicates the study of the processes of friction and wear of its elements and increases the complexity of the tests. There are no devices for automating measurements and registration

test results. It also increases the complexity of the test.

The purpose of the invention is to reduce the labor intensity and approximation of test conditions to operational, and therefore | increase the effectiveness of the test.

This goal is achieved by having a test bench for an internal combustion engine comprising a load device, a base, two pairs of struts, a suspension with a frame, an auxiliary engine with a control unit and a rotational speed sensor with a converter, the stands being placed on the base, the suspension is located on one pair racks, and the load device is balanced on another pair, additionally contains a suspension swing mechanism, and the latter is placed on balance bars, with the swing swing axis coinciding with the stake axis The engine under test shaft, the auxiliary engine is connected to the suspension through the swing mechanism, and the block

control through converter co. single with rotational speed sensor. In addition, the swinging mechanism of the suspension can be made in the form of an eccentric mechanism, containing

a guide groove and an eccentric, the latter being connected to an auxiliary engine, and the groove is made in the suspension frame.

FIG. 1 is schematically depicted.

proposed stand, general view4 in FIG. 2 is a section A-A in FIG. ij in FIG. 3 - stand layout is functional.

Based on 1 stand, two pairs of racks 2-5 are installed, on which

using bearing units 6-9

load device 10 in the form of an electric machine and suspension 11 are balanced in balance. On the frame of suspension 11 with the help of paws 12,

The test motor 13 is fixed, connected to the load device 10 by the drive shaft 14. On the base 1, an auxiliary motor 15 and a rotational speed sensor 16 are also fixed, electrically interconnected via a conversion device 17, the shaft of the electric motor 15 is provided with an eccentric 18 entering the groove 19 opr frame of the suspension 11. The groove 19 and the eccentric 18 form the swing mechanism of the suspension 11. The electric motor 15 is adapted to move over the base of the 1-stand. The rotational speed sensor 16 is connected to the shaft by a transmission device 10. The bench is equipped with a resistance torque sensor 20, fuel consumption 21, temperature sensors and pressure 22 connected via a switch 23 to the recording device 24.. . The stand operates as follows. After starting and testing the engine 13, its crankshaft is loaded with a moment: resistance by means of a load device 10 that absorbs engine power. Then, an auxiliary electric motor 15, a rotating eccentric 18, is turned on. Rotating, the eccentric 18 informs the suspension 11 oscillatory movements about the horizontal axis of the suspension, imitating dynamic loading modes. The amplitude of oscillation of the suspension 11 is adjusted by moving the eccentric 18 along the groove 19 of the supporting frame of the suspension 11. The oscillations of the suspension add up with the oscillations of the engine 13 and provide high dynamic loading conditions, similar to exploitation of the intense wear and running-in of its parts. The signal from the rotational speed sensor 16 through the converter device 17 automatically sets the rotational speed of the eccentric 18 equal to or multiple of its own frequency of the engine 13. Signals of pressure sensors, temperature 22, rotational speed 16, fuel consumption 21, torque 20, through the switch 23 in series, with a certain periodicity, are connected to the recording device 24. The process of measuring and recording information is automated. Disassembly and. The adjustment of the crank mechanism of the engine, which is necessary for determining the processes of friction and wear of its evils and parts, can be carried out without removing it from the stand. To do this, moving the motor 15 along the base 1, release the support frame, the suspensions from the eccentric 18, and rotate it around the horizontal axis at an angle of +90, which provides free access to the specified friction units. . Thus, the proposed stand allows bench testing of the engine to be more severe and reduces test time by telling the engine complex oscillatory movements, which causes intense wear and running-in of components and parts and reduces loading cycles before fatigue failures occur. For different modes of loading, the intensity of the wear of the matings of the cylinder-piston group and the crank mechanism of the internal combustion engine of the proposed stand increases in 6 hours of testing by 10-30% compared to tests on the well-known stand, which reduces the time by 10-30% tests, and their conditions closer to operational. The developed stand can be used for running in. And researching methods of accelerated testing, close to operational ..

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Claims (2)

1. STAND FOR TESTING THE INTERNAL COMBUSTION ENGINE, containing: load device, base, two pairs of racks, a suspension with a frame, an auxiliary engine блок with a control unit and a speed sensor with a converter, the racks are located on the base, the suspension is located on one pair of racks, and the load device is balanced on the other pair, which means that, in order to increase efficiency by approximating the test conditions to the operational ones, the stand additionally contains a suspension swing mechanism, and after NJ balancer placed on racks, wherein podves- swing axis' ki coincides with the axis of the crankshaft of the engine test, the auxiliary motor is coupled with the suspension through a rocking mechanism ·, and the control unit through the inverter connected to the speed sensor. 2. Stand pop. 1, characterized in that the swing mechanism of the suspension is made in the form of an eccentric. a mechanism containing a guide groove and an eccentric, the latter being connected with an auxiliary (engine, and the groove is made in the suspension frame. SU „, 1048353