SU800779A1 - Stand for investigating interaction of wheel with road coating - Google Patents

Description

one

The invention relates to a device for studying the interaction of a wheel with a road surface, in particular for studying the trajectory of solid particles on the surface, moisture and dirt, in order to create effective means. protection against particles flying out from under the wheels.

A stand-up for studying the interaction of a wheel with a road surface, containing a trolley for a test wheel, mounted on a track with guides and a model of a road surface, and recording equipment is known. The test wheel, mounted on a trolley, is pressed with weights against the floor with the required load, and trap nets are mounted behind the wheel to capture and then count the particles discarded by the wheels. In addition, a movie camera is installed on the trolley. The cart is equipped with an engine that provides movement along the track at a speed of 40-120 km / h, as well as a brake system l.

The disadvantages of the stand are that the weight of the cart with the engine, brake system, weights to simulate the loading of wheels, etc. It is large enough, and for acceleration it requires considerable power and a large path length, as well as due to its large dimensions the stand cannot be placed indoors, as a result of which the experiments are more dependent on meteorological conditions. The complexity, power consumption, and bulkiness of the stand determine its high cost and long design and manufacturing time.

The purpose of the invention is to simplify the design, reducing energy consumption.

5 and the dimensions of the stand.

This goal is achieved by the fact that the stand is equipped with a guide roller, a remotely controlled lock that interacts with the cart,

0 and elastic cords, one end fixed to the trolley, enveloping the guide roller, mounted on the middle of the track, and the other connected to the winch cable,

Claims (3)

5 installed at the end of the track, while the imaging equipment is stationary, and the trolley is installed in the guide tracks with limited movement in the vertical direction and is equipped with a vertical guide connected to each other to set the axle of the test wheel and a jack to create: a radial load on wheel. A lock can be installed at the beginning of the track. In another embodiment, the stand can be equipped with a second winch, mounted at the beginning of the track, and a carriage on which a lock is fixed, installed in the guide tracks and connected to the second winch with a cable. FIG. 1 shows a schematic of the stand, a general view; in fig. 2 - the same, top view; FIG. 3 is a section A-A in FIG. 1. The stand contains a trolley 1 with a test box, a forest 2, which is mounted on a track 3 with guides 4 and 5 mounted on a base 6, and Track 3 includes a measuring section representing the bark 7 with a model 8 of the road surface. The recording equipment in the form of film and television cameras 9-15 is fixed. A guide roller 16 is fixed in the middle of the track 3. On the cart 1, the ends of the rubber cords 17 are reinforced, KOTOpfcie bends around the roller 16, Other ends of the cords 17 are connected by a rod 18 with cable 19 of the winch 20 installed at the end of the track 3. Cords 17 can be skipped through the auxiliary rollers 21 and 22, which allows increasing their length without increasing the length of the stand. A remotely controlled lock 23 cooperating with the trolley 1 can be installed at the beginning of the track 3 or on the carriage 24 which is mounted in the guides 4 and 5. The trolley 1 is provided with a vertical guide 25 in which a screw jack 26 is mounted with a pin fixed on it 27 wheels 2. The carriage 24 is connected via a dynamometer 28 to a tro, cat 29 of the second winch 30. The bench works as follows. Before conducting the experiment, the bench is in the initial state. At this cable 19 maximally released cords 17 are free, the bar 18 is in the extreme The right position, trolley 1 is in the middle of the track and connected with the lock 23 to the carriage 24, and the test wheel 2 is located on the road surface model 8, When the jack 26 is installed, the specified value of the vertical load is fitted. On model 8 of the road surface, particles of gravel, dirt, water, melted snow, etc. are placed in a given place. By means of the winch 30, the carriage 24 together with the trolley 1 is retracted to the extreme position at the beginning of the track 3. With the help of the dynamometer 28, the tension force of the cords 17 is determined. The pointer of the dynamometer 28 is calibrated to. Units of speed, pointing to the final speed, which is achieved by the trolley 1 at a given force of the cord tension 17, In this position, the minimum specified velocity of the trolley 1 through the measuring section is ensured. To ensure greater speed, the cord 24 increases the tension of the cords 17 up to the extreme position of the tangi 18 at the end of the track 3, which ensures that the maximum speed of the trolley 1 passing through the measuring section is 120 km / h. Then, the remotely controlled lock 23 is opened, the Cart 1, together with the wheel 2, under acceleration of the tension of the cords 17, receives acceleration and, at the moment of approaching the roller 16, acquires a predetermined speed. At the same time, the wheel 2, having unrolled when rolling along track 3, rolls with almost constant speed over the measuring section and discards particles, the trajectories of which are fixed by television and movie cameras 9-15. Moving further along the guides 4 and 5, the carriage 1 begins to experience an increasing resistance force from the stretching cords 17 and brakes to a stop in the extreme position at the end of the track 3, after which it accelerates again, making a cycle of damped oscillations relative to the guide roller 16, The degree of attenuation of oscillations depends mainly on friction losses. On this basis, on the braking section, the guides 4 and 5 are made of a material constituting a friction pair with a high coefficient of friction with the material of the rubbing surfaces of the carriage. and with the help of the lock 23 it is connected with the cart 1. The stand is ready for a new experiment. The invention allows you to significantly reduce the size of the stand, simplify its design, significantly reduce energy consumption for the experiment and ensure that it is carried out in laboratory conditions regardless of weather conditions, which increases the accuracy and reliability of the results, as well as significantly reduce the cost and duration of the experiment. Claim 1. A stand for studying the interaction of a wheel with a road surface, containing a trolley for a test wheel, mounted on a track with guides and a road surface model, and recording imaging equipment, characterized in that, in order to simplify the design, to reduce energy intensity and the stand dimensions, it is equipped with a guide roller, a remotely controlled lock interacting with the trolley and elastic cords, one end fixed on the trolley, enveloping the guide roller, in the middle of the track, and the other connected, with a winch cable installed at the end of the track, while the imaging equipment is stationary, and the trolley is installed in the guide tracks with limited movement in the vertical direction and provided with interconnected vertical guide to install the axle of the test wheel and a jack to create a radial load on the wheel. 2. The stand according to claim 1, of which the lock is installed at the beginning of the track. 3. The stand according to claim 1, characterized in that it is provided with a second winch, mounted at the beginning of the track, and a carriage on which the lock is fixed, |. installed in the direction of the track and connected to the cable of the second winch. Sources of information taken into account in the examination of I.LouOiinev Ctiartes E. An unusuaE Component the Bocino-rnodee TSB nose aear orraveE de Eector..A. Paper, J) Ia, 5pp 7