RU2242386C1 - Device to check efficiency of vehicle braking - Google Patents

Abstract

FIELD: transport engineering; testing facilities.

SUBSTANCE: invention relates to stands for diagnosing condition of brakes of road vehicles, including those furnished with antilock systems. Proposed device contains stationary platform including two similar sections with fitted-on drive and support rollers. Rollers are connected by chain drive. Drive rollers are connected with flywheel rotated by drive used to bring the device to initial braking speed conditions. Device is furnished with units for measuring brake force on each wheel of vehicle and follow-up rollers installed on stationary platform.

EFFECT: improved reliability and quality of diagnosing of vehicle brake systems owing to bringing diagnosing test conditions to real braking conditions by increasing accuracy of measurements of brake force.

1 dwg

Description

The invention relates to test equipment, and in particular, to stands for diagnosing the braking qualities of vehicles, in particular, equipped with anti-lock braking systems (ABS).

A device for controlling the effectiveness of braking of vehicles is a power roller brake stand (Technical operation of cars: Textbook for high schools. / Ed. G.V. Kramarenko. - 2nd edition, revised and supplemented. - M .: Transport, 1983, p. 143). It contains an electric motor, which drives the rollers into rotation through the gearbox, onto which the car is mounted by the braked wheels and is scrolled.

Its disadvantage is that the speed of the rollers is equivalent to the movement of a braking car at a speed of 2-5 km / h, which is not enough to diagnose vehicles equipped with anti-lock braking system (ABS), to increase the initial braking speed, it is necessary to increase the power of the electric motor and, accordingly, its size, the process of braking the wheels, the speed of rotation of the rollers does not change in proportion to the longitudinal speed of the vehicle during braking.

The closest in technical essence and the achieved result and adopted as a prototype is a device for monitoring the effectiveness of braking of vehicles - inertial brake stand (Technical operation of cars: Textbook for universities. / Ed. G.V. Kramarenko. - 2nd edition, revised and supplemented. - M.: Transport, 1983, p. 146, Fig. 6.34b). It contains a fixed platform, including two identical sections with drive and support rollers mounted on them, connected by a chain gear, while the drive rollers are connected to the flywheels untwisted from the drive used to output the device to the initial braking speed mode.

The disadvantage of this device is that it does not directly measure the braking forces on each wheel of the car.

The technical result of the claimed invention is to increase the reliability and quality of diagnosing brake systems of a car by maximizing the test diagnostic mode to the real braking conditions:

- by increasing the accuracy of measuring the braking force due to the maximum possible reduction of friction nodes;

- due to the ability to assess the ability of the braking wheel to create a side reaction due to the ability to control the amount of slippage of each wheel.

This object is achieved in that a device for monitoring the braking performance of a vehicle, comprising a fixed platform, including two identical sections with drive and support rollers mounted on them, connected by a chain gear, while the drive rollers are connected to a flywheel untwisted from the drive used for output device in the mode of initial braking speed, contains nodes for measuring the braking force on each wheel of the car.

To accelerate the rollers to the initial braking speed and untwist the flywheels, low-power electric motors are used. Before braking starts, the electric motors are turned off, and the flywheels transmit their kinetic energy to the drive rollers, which are affected by the braking wheels of the car, as a result of which the shafts experience torsional stresses proportional to the braking forces on the wheels of the car, which are measured by units for measuring braking forces.

The difference from the prototype is the presence of nodes for measuring the braking force on each wheel of the car.

The presence of distinctive features allows us to conclude that the claimed invention meets the criterion of "novelty."

Analysis of patent and scientific and technical information did not allow to identify sources containing information about the fame of the distinguishing features of the claimed invention, which indicates the compliance of the claimed device with the criterion of "inventive step".

The proposed device is illustrated in the drawing, which shows a diagram of the device (top view).

The device includes a fixed frame 1 with mounted support 2, drive 3 and servo 4 rollers, electric motors 5 connected to the shafts 6 by chain gears 7, to which flywheels 8 and units for measuring brake forces 9 are attached.

The device operates as follows. The wheels 3 of one of the axles of the car are mounted on the supporting 3 and drive 2 rollers, then the electric motor 5 through the chain drive 7, the shaft 6 and the drive roller 2 accelerates the wheels of the car and flywheel 8 to the initial braking speed. At the initial moment of braking, the electric motor is turned off, and the braking force of the car wheel on one side and the flywheel torque on the other hand act on shaft 6, as a result of which shaft 6 is twisted. The amount of twisting of the shaft 6 is measured by the node for measuring the braking force 9 and transmitted to the computer. Tracking roller 4 determines the moment of blocking the wheels of the car. Similarly, the second axis of the vehicle is diagnosed.

The above device allows you to increase the initial braking speed using low-power electric motors, measure the braking force, as well as diagnose cars equipped with ABS.

Claims (1)

A device for monitoring the braking performance of a vehicle, comprising a fixed platform, including two identical sections with drive and support rollers mounted on them, connected by a chain drive, while the drive rollers are connected to a flywheel spun from the drive used to bring the device to the initial braking speed mode , characterized in that it contains nodes for measuring the braking force on each wheel of the car and tracking rollers mounted on a fixed platform.