SU1247715A1 - Device for diagnstic checking of conditions of setting controlled wheels of motor car - Google Patents

Abstract

The invention makes it possible to increase the design of the stand while increasing its accuracy. The automatic stand for running-in of the internal combustion engine contains a test engine mounted on the stand frame, snarling: the g of the water-dispensing organ of which is connected with an electromagnet through a control lever and connected to an electromagnet with a crankshaft with a loading device made in the form of a flywheel and a frequency sensor rotation, connected to the control device i. The output of the latter is connected to the coil of the electromagnet. There are two stops on the stand that limit the movement of the control lever, one of which is fixed to the control device. The control unit is designed as a guide with a slider equipped with two limiters, which act on the output link of the rotational speed sensor, and acting on the limit switch connected to the coil of the electromagnet. The guide through the screw transmission is connected with the stand bed, with one of the stops of the control lever mounted on the guide. 1 sludge s (L 1C 4ib vl SP

Description

. I

The invention relates to mechanical engineering, in particular, to engine construction, in particular, to stands for burnishing and testing of internal combustion engines.

The aim of the invention is to simplify the design, increase the reliability of the stand, simplify setting the required burn-in modes and increase the accuracy of setting the change in rotation frequency.

The drawing shows schematically the proposed stand.

The stand consists of a frame 1, on which the engine 2f under test is a lever 3 of a fuel-supplying organ of which 4 is connected to the control lever 5. The control lever 5 is hinged to the frame of the stand 1, while the lower end of the lever 5 has an adjusting groove 6, and the upper end is connected to the electromagnet 7 with the coil 8. In addition, a spring 9 is attached to the upper end of the control lever 5 mounted on an adjustable stop 10 mounted on the stand 1 of the stand. A crankshaft (not shown) of the engine under test 2 is connected by a shaft 11 to a load device executed in the form of a flywheel 12. Gear 13 is fixedly mounted on shaft 11, which is in engagement with gear 14 of rotational speed sensor 15 with centrifugal weights 16, spring 17 and output link 18. The stand is equipped with a control device 19 consisting of a guide 20, on which a nut -21 is fixed, which is in engagement with a screw 22, which is fixed to the frame 1 of the stand and provided with a handle 23. In a groove 24 a direction 20 movably mounted There is a slide 25 with an unregulated 26 and an adjustable 27 stops, and it is installed in such a way that the output link 16 of the rotational speed sensor 15 is between the stops 26 and 27. On the guide 20 there is also a limit switch 28 connected to the coil 8 of the electromagnet 7 and connected to terminals 29 with a power source (not shown). The limit switch 28 is located on the guide 20 in such a way that it can interact with the uncontrollable stop 26 of the slide 25 in one of its extreme positions, determined by the value of pa1

47715J

for 24. In addition, on the guide. 20, an adjustable SUP 30 is installed, the position of which determines one of the extreme positions of the control

5 levers 5.

The stand works in the following way. After mounting the tested engine 2 on the base 1 and starting it up, the crankshaft of the latter drives

 O The rotation of the shaft 11 and associated with it

the flywheel 12. Herewith, the gear 13 drives the gear 14 of the rotational speed sensor 15 into rotation. The centrifugal weights 16 when rotating create an effort.,

 5 which stretch the spring to compress the spring 17, however, when the engine is started and it is idling at a speed of rotation set in dp of the run-in mode of no-load, uspi,

20 generated by weights 16 is not enough to overcome the preload tension of the spring 17; Therefore, the latter holds the output 18 of the rotational frequency sensor 15 at

 the stop 26 of the slide 25, which, in turn, keeps the contacts of the end switch 28 closed. In this case, a voltage is applied to the coil 8 from the power source through terminals 29

30 of the electromagnet 7, which, overcoming the force of the spring 9, holds the lower end of the control lever 5 on the stop 30. The stop 30 is adjusted so that the position of the lever 35 of the engine's toplivating organ at a constant length of thrust 4 corresponds to the frequency of rotation of the engine set for no-load handling. The job of the required 40 running modes for rotation frequency and load is performed by the control device 19. When rotating the handle 23 of the screw 22, the last J moves the nut 21 and associated with

45, its guide 20 in the direction of the motor and the gate 2. This changes the position of the stop 30, and since the electromagnet 7 holds the lower end of the control lever 5 on the stop 30,

50, the position of the lever 3 of a toplivosurgeon of the engine of the engine, i.e. fuel supply increases. The engine begins to increase the frequency of rotation of the shaft 1.1, i.e. The engine shaft and associated flywheel 12 receive angular acceleration. It is known that for the quality of the running-in process it is necessary

attach a load moment to the engine crankshaft / It is also known that the moment created by the rotating body is determined by the formula

M

du) w dt

(one)

I

np

db) dt

reduced moment of inertia of rotating masses.

tg angular acceleration.

This moment will determine the engine load moment.

With a further increase in the frequency 15 where J of the rotation of the motor shaft, the force generated by the centrifugal weights 16 increases and overcomes the force of the preload of the spring 17. The output link 18 of the sensor 15 is often 20

The rotation starts to move and stops contacting the stop 26 of the slide 25 at some starting frequency for a given position of the speed control device. Since the 25 slider 25 remains in place, the contacts of the limit switch 28 remain closed. Moving with an increase in the rotational speed, the output link 18 overcomes the distance between the supports of ZOs 26 and 27, while the change in the rotational frequency in comparison with the initial one is equal to the AO. The output link 18 abuts against the stop 27 and slides the slider 25 into the slot 14 at the direction of the clamp 20, while the contacts of the limit switch 28 open and the coil 8 of the electromagnet 7 is de-energized. Under the action of the spring .9 the control lever 5 rotates to the stop 10 and moves 40 through 4, the lever 3 of the fuel dosing body of the engine 2 in the direction of reducing the fuel supply. In this case, the frequency of rotation of the engine shaft begins to fall. The force of the spring 17 exceeds the force generated by the centrifugal weights 16, and the output link 18 of the rotational speed sensor moves in the opposite direction to the stop 26 of the slide 25. When the frequency of the rotation 50 decreases by dU, the output link 18 of the rotational speed sensor presses through the stop 26 the slider 25 to the limit switch 28, the closure of his contacts, which leads to the operation of the electromagnet 55 and the increase, as indicated above, the fuel supply. In this way, the perioPos is performed and AW is now liable for the displacement of the orgone, and At is the ratio of the magnitude to the displacement depends

By walking around with or rotated, the next one in control strut 21 ensures that, except for 20, it is equal;

a recurring change in the frequency of rotation of the motor shaft by the value of d U). In this case, the output characteristic of the rotational speed sensor is selected linear, i.e. with the position of the lugs 26 and 27 unchanged, the magnitude of the AO) will be constant, independent of the rotational speed. By changing the distance between the lugs 2b and 27, it is possible to achieve a change in the magnitude di, for O, the formula (1) is

yr

Wjf

(2)

where is j

LR

the reduced moment of inertia of the rotating masses, l (l) - the magnitude of the change in frequency

rotation;

At is the time interval over which the rotation frequency is changed by the value of AU).

Since during operation of the stand 1 "and AW do not change, according to the formula (2), the load moment is inversely proportional to the value of t. It is known that a change in the rotational frequency occurs, the faster, the larger the amplitude of the movement of the lever 3 of the engine's top-dosing body, and consequently, the fuel supply. That is, the time At decreases, and the load moment accordingly increases as the amplitude of movement of the control lever increases. The amplitude of movement of the control lever 5 depends on the position of the stop 30, since the stand 10 is in a fixed position when the bench is running.

It is known that monotonous growth (in most cases linear) of rotational frequencies and loads is necessary for the quality of the running-in process. The connection between the rotational speed and the load is as follows. When moving in the direction of the engine control device 19 by means of a screw 22 with a nut 21, the initial position of the stop 26 of the slide 25 is changed, and therefore, as stated above, the initial speed of rotation increases, moreover, the stop 30 moves with the guide 20 increases the amplitude of movement of the control lever 5 and, accordingly, the load moment, etc.

Thus, to set the running-in speed and rotational torque, it is only necessary to change the position of the control unit relative to the engine, which greatly simplifies the running-in control process. The groove 6 of the lever 5 serves to adjust the amplitude of the movement of the lever 3 of the engine fueling body when setting up the stand.

In addition, as the flywheel 12, the internal flywheel of the internal combustion engine can be used, which will allow to produce high-quality engine burn-in, without removing it from the car on which it is installed, during repair.

Claims (1)

Claims of the invention, wherein the guide through the screw transmission is associated with the frame, one of the stops-limiters for the fuel supply is connected with the guide, on which 25 there is a slider fitted with the first and second limiters of the frequency sensor's output link. which interacts with the limit switch, 7 An automatic stand for running-in of an internal combustion engine, containing a motor under test with a load device, a frame, a frequency sensor with an output link, a frequency actuator and a control device, the load device being completed as a flywheel and the actuator - 5 is also implemented in the form of control of the position of the regulator of the engine, lever, limit stops of the maximum and minimum fuel supply and the electromagnet when the water is pulled through a lever interacting with the stops, in order to simplify the structures in order to increase accuracy and reliability, the control unit is completed in the form of a guide, a screw transmission, a slider, the first and second limiters of the output link of the frequency sensor and the limit switch included in 20 chain electromagnet drive electrodes the gates, the guide through the screw transmission is connected with the frame, one of the stops limiting the fuel supply is connected with the guide on which the slider is fitted, equipped with the first and second limiters of the frequency sensor ejection link, one and three of which interact with limit switch, 7 Compiled by N. Kolesnikova Editor L. Veselovska Tehred N. Bonkalo Proofreader V. Sinitska Order 4116/41, Circulation 778 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raupyuka nab., 4/5; Production and printing company, Uzhgorod, Projecto st., 4