SU1411189A1 - Brake shoe lining wearout alarm - Google Patents

Abstract

The invention relates to means of controlling brake systems, in particular to the wear indicators of shoe friction linings built into the vehicle. The purpose of the invention is to increase the reliability of work. The detector contains sensors 1 and 2 for wear of the linings of two wheels in series with which resistors 3 and 4 are connected. The combined terminals of the resistors are connected via a common communication line to the inputs of comparators 5, 6, 7 with successively increasing thresholds. The outputs of the comparators are connected through a rheistor 8 to a source 9 of stabilized voltage. The output of the comparator 6 is connected to the input of the first controlled generator 10 and with the forbidden input of the BANCH 11 element, the direct input of which is connected to the output of the comparator 7, and the output to the input of the second positive generator 12. The inputs of the OR 13 element are connected respectively to the outputs of comparator 5 and controlled generators 10, 12. An indicator 14 is connected to the output of the OR 13 element. 1 Il. (ABOUT

Description

9 8th

13

00

;about

Zni

FIELD OF THE INVENTION The invention relates to the transport industry of mechanical engineering, in particular, to automobile friction wear indicators: linings

mozov.

The purpose of the invention is to increase the reliability of the alarm device by reducing the number of communication lines with sensors.

The drawing shows a functional diagram of the indicator of the wear of the bargain pads of the two wheels of the car.

The indicator contains built-in sensors 1 and 2 for wear of the linings of the two wheels, in series with which resistors 3 and 4 are connected, the combined terminals of the resistors are connected via common line to the inputs of the comparators 5-7 with successively increasing thresholds. The outputs of the comparators are connected via a resistor 8 to the source 9 of stabilized voltage. The output of the comparator 6 is connected to the input of the first controlled generator 10 and with the inverse input of the BAN 11 element, the direct input of which is connected to the comparator output j and the output from the DC.ODOM of the second x controlled generator 12, the inputs of the OR 13 element are connected respectively with the outputs of comparator 5 and controlled generators 10 and 12 To the output of the element JfflH 13 is connected an indicator, a cator 14,.

Signal works as follows.

Let us suppose that iom1-1s of resistors 3, 4, and 8 are selected, for example, in the ratio 2Rj R and R,

Then, if the brake linings are in good condition, the contacts of sensors 1 and 2 are open and a potential equal to the stabilized 14 E is established at the inputs of the controller 5-7. At the outputs of the comparators 5-7, logical signals O are generated. The generator 10 is decelerated and returns at the output O. The element BAN 11 generates O, which inhibits the second generator 12, Thus, the logical O signal arrives at all the inputs of the element OR 13. Therefore, the O signal appears on its output, the indicator 14 is turned off, that signals about serviceability tormoznp: linings,

five

0

5 0 5

0

five

In the case of wear of the lining associated with sensor 1, its contacts are closed and a potential equal to 2/3 E is established at point A, and at the outputs of co-shatures 5-7, respectively, logic O, O and 1, by which generator 10 is inhibited, and generator 12 is excited. At the output of the BANNER 11, a logical 1 signal appears, and the indicator 14 gives out an intermittent light signal, for example, with a frequency of 1 Hz, indicating wear of the brake lining associated with the sensor. .one.

In case of wear of the lining associated with sensor 2, a potential equal to 1/2 E appears at point A. At the same time, at the outputs of comparators 3-7, logical O, 1, 1 are set, with which the controlled generator 10 is excited, and generator 12 is inhibited, and indicator .14 causes an intermittent light signal, for example, at a frequency of 4 Hz, indicating that the lining associated with sensor 2 is worn.

In the case of wear of both pads at point A, a potential of 2/5 E. appears.

At the same time, at the outputs of the comparators 5-7, the signals of logical 1 are set, with which the controlled generators 10 and 12 are braked, and the signal of logical 1 from the output of the comparator 5 indicator 14 is turned on in continuous mode, indicating the wear of both pads.

Thus, the wear of two pads is monitored with one link and one indicator. In three-axle vehicles, for example, you can use the signals of two pad wear sensors mounted on two twin wheels (from four wheels on the same axis) using one common communication line. This increases the reliability of the detector, as the links are among the least reliable elements of automotive systems. In addition, the cost of the detector is reduced and the design of the dashboard is simplified.

Claims (1)

Invention Formula The brake pad wear indicator, containing two wheel pad wear sensors, the indicator, the first and second voltage comparators, the combined inputs of which are connected through a resistor to a source of stabilized voltage, and the output of the second comparator are connected to the input of the first controlled generator, - l. Considering that, in order to increase reliability, it is equipped with a third comparator, a BANE element, a second controlled generator, an OR element, and two resistors connected in series with the lining wear sensor, the combined terminals of the resistors: through a link to the combined the inputs of three comparators, the outputs of the second and third comparators are connected respectively to the inverse and direct inputs of the BAN element, the output of which is connected through a second controlled generator to the first input of the element OR, sec The third and third inputs of the OR element are connected respectively to the outputs of the first comparator and the first controlled generator, and the output is connected to the indicator.