SU1493911A1 - Rig for testing vehicles - Google Patents

Abstract

The invention relates to a transport engineering and can be used to assess the traction and braking qualities. Vehicle. The goal is to reduce material consumption. The stand contains the left and right running drums, inertial masses and an electric motor. The inner end 24 of the right running drum 9 is rigidly connected to the torsion bar 26, which is freely mounted in the outer end 25. The gears 22,23 are fixed on both sides of the ends 24,25. During vehicle tests, the torque transmitted by the torsion bar 26 is determined by the difference in the angles of rotation of the disks 22, 23. 5 sludge.

Description

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(21) 4324238 / 27-1I

(22) 04,11.87

(46) 07.15.89. Bul No. 26

(71) Scientific and Production Association Kazavtotranstekhnika

(72) K, S. Bl Shkin and N.P. Tarasov (53) 629.113.59 (088.8)

(56) USSR Copyright Certificate No. 297313, cl. G 01 M 17/00, I969.

(54) VEHICLE TEST BENCH (57) The invention relates to a transport engineering and can be used for the evaluation of

and brake qualities of vehicles. The goal is to reduce material consumption. The stand contains the left and right running drums, inertial masses and an electric motor. The inner end 24 of the right treadmill 9 is rigidly connected to the torson 26, freely mounted in the outer end 25. The gears 22 are fixed on both sides of the ends 24,25; 23. During vehicle tests, the torque transmitted by the torsion 26 is determined by the difference in the angles of rotation of the disks 22, 23. 5 or less.

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The invention relates to transport engineering and can be used to determine the traction and braking qualities of vehicles.

The purpose of the invention is to reduce material consumption.

Figure 1 shows the stand in the plan; figure 2 - section aa in figure 1; on fig.Z - view B in figure 2; figure 4 - the first pulse angle sensor twist, General view; on fig.Z - the second pulse angle twist sensor, a general view.

On base 1, bearing supports 2 - 5 are fixed, in which shafts 6.7 are mounted with left 8 and right 9 running drums mounted on them. An inertia mass 10 is connected to the outer end of the shaft 6, and a drive and braking device 11, made in the form of an electric motor, and an inertial mass 12. are connected to the outer end of the shaft 7. The inner ends of the shafts 6 and 7 are connected to a controlled coupling 13. With the left 8 and on the right 9 running drums, supporting running drums 14, 15 are installed in pairs on the basis of pairs. Between the running drums 8,14 and 9,15 there are installed lift-brake pads 16, 17 and pick rollers 18,19. The stand contains two pulse sensors of the twist angle. Part 20 of the first sensor is rigidly fixed to the bearing support 4, and part 21 of the second sensor has limited mobility With self-locking relative to the bearing support 5 along an arc centered on its axis. The movable parts 22, 23 of the first and second sensors are rigidly fixed on the shaft 7 near the inner 24 and 24 outer ends of the running drum 9. The shaft 7 section between the moving parts 22.23 of the spin angle sensors is made in the form of a torsion 26 rigidly connected with the inner end 24 and freely installed in the outer end 25 of the first roller drum 9. The fixed parts 20,21 sensors are installed in the same plane on a line parallel to the axis of the torsion 26. The movable parts 22, 23 of the sensors are made in the form of disks on which; with a uniform pitch placed tooth. The disks 22, 23 are fixed on the shaft 7 so as to provide an initial angle

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the shift of the teeth of the disk 22 relative to the teeth of the disk 23 180 e.

On the bearing support 3 and the shaft 6, the fixed part 27 and the movable part 28 of the pulse speed sensor are fixed, fixed to the corresponding parts of the 20,22 pulse spin angle sensor.

The outputs of the fixed parts 20, 21, 27 of the pulse sensors are connected to the input of the sensor signal processing circuit 29. A thermistor 31 is connected to the sensor signal processing circuit 29 for temperature compensation of changes in the elastic modulus of the torsion 26. The output of the processing circuit 29 is connected to the recording equipment 30.

To determine the resistance to rotation of the wheels of the drive bridge, the test vehicle is driven by the wheels on the running drums 8.14 and 9.15, turn on the controllable clutch 13 and using the drive braking device 11. The running drums are rotated. In this case, the torque from the driving-braking device 11 operating in engine mode will be transmitted to the driven wheel through the outer end of the shaft 7, torsion bar 26, inner end 24 and the right jogging drum 9. To the other driven wheel torque is transmitted through torsion bar 26 , shafts 6, 7 and the left running drum 8. Under the action of the moment, the torsion 26 will twist and the teeth set on the shaft 7 of the disks 22,23 will move.

The pulses from the fixed parts 20 21 of the twist angle sensors are shifted to the same angle. By entering the input of the sensor signal processing circuit 29, these pulses are converted into a sign and the average current value of the indicator 30, proportional to the moment of resistance of the driven wheels of the vehicle.

In order to diagnose the technical brakes of the wheels of the driven axle, they are accelerated by a drive-brake device 11 to a predetermined speed of speed, upon reaching which they turn off the control clutch 13 and turn on the drive of the brake pedal. By means of the electric motor I1, the running drums are driven into rotation of the wheel. The torque status is evaluated for the technical condition of the transmission.

Having started the vehicle engine through the cross-country drums 8.9 and having limited the fuel supply to the engine, they determine the stability of the engine in the roll-up mode by torque fluctuations. To determine the driving qualities, the drive wheels are accelerated to a predetermined speed with the help of the engine and transmission of the vehicle. Using the drive-brake device 11, operating in the brake mode, set the desired load. In this case, torsion 26 will twist in the other direction. According to the braking torque transmitted by the torsion 26 and fixed by the indicator 30, the tractive qualities of the vehicle are evaluated.

For a comparative definition of vehicle pick-up, drive wheels accelerate running drums 8.9 to the maximum possible speed with the gearbox pre-shifting from third to fourth. In this mode, using the recording equipment 30, an informative segment of the mechanical characteristics of the vehicle is recorded, which can be used to assess the technical condition of the power unit (ignition, fuel equipment, L-transmission, etc.).

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The energy stored by the flywheels in the previous mode can be used to diagnose the technical condition of the axle wheel brakes. When the speed drops to the preset level, the controlled clutch 13 is automatically switched off and the brake pedal drive is activated. According to the braking distance and the difference in decelerations of the left and right wheels, the technical condition is assessed.

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brakes of the left and right wheels of the vehicle.

Thus, in the enclosed stand for measuring the torque, parts of the roller drum are used, which eliminates the need to use an additional torque sensor.

Claims (1)

Invention Formula 15 20 25 ten A vehicle test bench, comprising a base, two coaxial running drums mounted on shafts mounted in supports fixed to the base, controlled by a clutch connected to the inner ends of the shafts, inertial mass, kinematically connected to the running drums, driven brake device, kinematically connected to the outer end of the first roller drum, rotational speed sensor, second roller drum, sensor signal processing circuit and recording apparatus A switch connected to the outputs of a sensor signal processing circuit, characterized in that, in order to reduce material consumption, it is equipped with two pulse twist angle sensors, movable (parts of which are fixed on the shaft of the first spacing drum on either side of its ends, mounted on the inner bearing support of this shaft, and the other is made in the form of a mechanical phase regulator mounted on 4Q outer bearing support of the same shaft, with the shaft of the first roller drum between the movable. parts of the pulse sensors of the twist angle are made in the form of a torsion, which is biodinally mounted in the outer end of the first jogging drum and rigidly connected to the inner end of the first jogging drum. thirty 35 W eight sixteen /four ff yffI /, L f8 47 "-O y / 7 ///// V // y7 /  one sri & .З 12  } 77 I /five