JPH0754888A - Pad wear indicator, probe for pad wear indicator, and display device for pad wear indicator - Google Patents

Abstract

PURPOSE:To precisely provide change information for a brake pad without applying uneasiness element to an user while using resource effectively. CONSTITUTION:In a probe 10, abrasion of a brake pad 22 is detected as a resistance value since a resistance raw material 13 as a conductive passage is abraded and reduced proportional to abrasion of a break pad 22. In a control unit 30, display of an indicator 40 for displaying an abrasion amount stepwise is controlled on the basis of a resistance value displaying the abrasion amount so as to display precisely the abrasion amount of the brake pad 22.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pad wear indicator for notifying wear of a brake pad, and more particularly to a pad wear indicator for notifying wear of a brake pad according to a circuit condition of an electric line arranged in a probe which is worn together with the brake pad. Regarding wear indicators.

[0002]

2. Description of the Related Art A padware indicator is a built-in U-shaped electric line, and a padware indicator probe that breaks the electric line when it wears together with a brake pad, and detects the circuit condition of the electric line. A pad wear indicator display device for displaying the wear condition of the brake pad, and a pad wear indicator probe shown in FIG. 9 is conventionally known as this type of pad wear indicator probe. The one shown in FIG. 10 is known.

In the padware probe 1, a copper wire 3 having a barrel portion 2 for crimping an electric wire at both ends is folded back in a U shape, and a pair of electric wires 4 having a tip covered with the barrel portion 2 are crimped. Then, the whole is molded with resin. Then, the folded-back portion folded back in a U-shape is directed toward the brake disc to form a brake pad. On the other hand, the display device 5 for the padware indicator is
It is composed of a relay 7 whose electromagnetic coil 6 is connected between the power supply lines in series with the padware probe 1 and an indicator lamp 9 which is connected in series between the power supply lines together with an electromagnetic switch 8 of the relay 7. There is. The electromagnetic switch 8 is turned off when the electromagnetic coil 6 is excited.

In such a structure, since the copper wire 3 in the padware probe 1 is initially conducting, the electromagnetic coil 6 of the relay 7 is connected via the electric wire 4 and the copper wire 3 as shown in FIG. Power is being supplied. Therefore, since the electromagnetic switch 8 is turned off, the indicator lamp 9 is not energized and the indicator lamp 9 is off. As the brake is used, the lining of the brake pad wears and the padware probe 1 also wears from the tip side. When the tip wears by a predetermined amount, the folded portion of the copper wire 3 in the padware probe 1 wears and is cut. Then, FIG.
As shown in FIG. 4, the energization path to the electromagnetic coil 6 is cut off, so that the electromagnetic coil 6 is de-excited and the electromagnetic switch 8 is turned on. Then, the indicator lamp 9 is energized and the indicator lamp 9 lights up, prompting the user to replace the brake pad.

[0005]

In the above-mentioned conventional pad wear indicator, when the wear is caused by a preset amount, the brake pad is suddenly urged to be replaced. Since the remaining amount for prompting the replacement is set to the minimum value, there are times when there is no time to spare even when suddenly prompting for the replacement, and it is anxious if the lamp lights up during driving. On the other hand, although it is possible to reduce such anxiety factors by increasing the remaining amount of the lining and urging the replacement, if it is replaced immediately, the resources are wasted. The present invention has been made in view of the above problems, and an object of the present invention is to provide a padware indicator capable of accurately notifying a user of a brake pad replacement time without giving anxiety to a user while effectively using resources. And

[0006]

In order to achieve the above object, the invention according to claim 1 has a U-shaped electric line in which a folded portion is oriented toward the brake pad in a probe that is worn together with the brake pad. In a putware indicator that is installed and displays the wear condition of the brake pad by detecting the circuit condition of the same electric line in the display unit, in the probe, the conduction path of the turnback part in the electric line decreases in accordance with the wear. With the above configuration, the display unit includes resistance detection means for detecting the electric resistance of the electric line, and wear amount display means for displaying the wear amount according to the detection result of the resistance detection means. ing.

Further, the invention according to claim 2 is a probe for a pad wear indicator, which has a U-shaped electric line having a folded-back portion oriented on the tip side, and which is held by the brake pad and wears together with the brake pad. The folded portion of the internal electric line is made of a resistance material. Further, the invention according to claim 3 provides the electric line in the probe according to claim 2, wherein the electric line in the probe is oriented substantially parallel to the wear direction, and the brake of the low resistance line. The pad is provided with the above-mentioned resistance material arranged between the two at the tip of the pad. The invention according to claim 4 detects the circuit condition of a U-shaped electric line in which the folded portion is oriented to the brake pad side in the probe that wears together with the brake pad, and displays the wear condition of the brake pad. The display device for a padware indicator is configured to include resistance detecting means for detecting the electric resistance of the electric line and wear amount displaying means for displaying the wear amount according to the detection result of the resistance detecting means.

[0008]

In the invention according to claim 1 configured as described above, as the brake pad wears, the probe also wears, and the internal electric line also wears gradually from the tip side of the folded portion. . Since the conductive path of the folded portion decreases with wear, the resistance value of the conductive path increases with wear. On the other hand, in the display unit, the resistance detecting means detects the electric resistance of the electric line, and detects that the electric resistance increases as it wears. On the other hand, the wear amount display means displays the wear amount according to the electric resistance detected by the resistance detection means, so when the wear is small and the electric resistance is small, the wear amount is also displayed as small, and the wear amount is increased. When the resistance increases, the amount of wear is also displayed large.

Further, in the invention according to claim 2 configured as described above, as the probe wears, it wears from the side of the folded portion on the tip side of the built-in electric line, but here the folded portion. Is made of a resistance material, the resistance value greatly changes as the resistance material decreases according to the wear amount. Further, in the invention according to claim 3 configured as described above, a pair of low resistance lines oriented substantially parallel to the wear direction are arranged in the probe, and the resistance is provided at the tip of the low resistance line. Since the material is arranged, the resistance material that connects a pair of low resistance lines oriented in parallel decreases in proportion to the wear, and the resistance change becomes proportional to the wear amount. .

Further, in the invention according to claim 4 configured as described above, when the brake pad is worn and the folded portion of the electric line in the probe is reduced, the resistance detecting means causes the resistance of the electric line to be reduced. The resistance is detected, and the wear amount display means indicates that the wear amount has increased as the electric line decreases and the resistance value increases.

[0011]

As described above, according to the present invention, the wear amount of the brake pad is notified, so that the user can know the wear state before wear until the brake pad must be replaced, and a sudden notice is given. You can prevent anxiety from occurring. Further, since the wear state is notified in advance, it is possible to set a bare wear amount when prompting the replacement time, so that effective use of resources can be achieved.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. In this embodiment, the brakes of the wheels of the four-wheel vehicle are displayed independently. 1 to 3 are perspective views showing a configuration of a padware indicator probe (hereinafter, simply referred to as a probe) according to an embodiment of the present invention. In the figure, a probe 10 has a pair of terminals 11, 11 formed by cutting a brass plate into a crank shape, and at one end of the terminal 11, a barrel portion 11a capable of press-contacting an electric wire 12 whose tip is covered is formed. ing. A pair of crank-shaped terminals 11, 11 are arranged in parallel, and the bending direction of the crank is made different so that the side opposite to the barrel portion 11a is narrowed, and the tips of the narrowed sides are separated by a predetermined amount. Meanwhile, the resistance material 13 is welded and fixed between the two. Further, the electric wire 12 is crimped to each barrel portion 11a and then molded by molding with a resin. In the present embodiment, the resistance material 13 is made of stainless steel, but other materials that produce equivalent resistance can be used.

Assuming that the tip of the probe 10 is the side on which the resistance material 13 is disposed, the probe 10 is held by the brake pad 22 with the tip facing the brake disc 21, as shown in FIG. The one electric wire 12 is grounded, and the other electric wire 12 is connected to the control unit 30. The control unit 30 has two comparators C as shown in FIG.
1, C2, a control CPU, and relays SW1 to SW3. Each of the two comparators C1 and C2 has a pair of input terminals, and outputs an ON signal to the control CPU when the input voltage of the first input terminal is lower than the input voltage of the second input terminal, and In the case of, an off signal is output.

Here, the first input end of the comparator C1 is connected to the electric wire 12 on the non-grounded side of the probe 10, and the second input end is connected to the resistor R0 connected in series between the power supply and the ground. -R2 resistance R1 and resistance R2
Is connected between and. Note that the resistance values of the resistors R0 to R2 are substantially uniform, and since a remarkably large value is not combined, the voltage at the connection point between the resistors R0 and R1 and the voltage at the connection point between the resistors R1 and R2. There is a relatively large difference between On the other hand, the first input terminal has a resistor R connected in series between the power source and the ground.
It is also connected to the connection point with 10 and R11. Now, ignoring the resistance of the terminal 11 and the electric wire 12 in the probe 10, and letting the resistance value of the resistance material 13 be Rv, R1
0, Rv << R11, and the resistance R
The voltage at the connection point between R10 and R11 is substantially determined by the ratio between the resistance R10 and the resistance Rv. Therefore, as the resistance value of the resistor Rv increases as described later, the voltage at the connection point increases. On the other hand, the first input end of the comparator C2 is similarly connected to the electric wire 12 on the non-grounded side of the probe 10, and the second input end is connected to the resistor R.
It is connected between resistors R0 and R1 in 0 to R2.

Initially, in the comparator C1, the voltage at the first input terminal is lower than the voltage at the second input terminal, and in the comparator C2, the voltage at the first input terminal is at the second voltage. The values of the resistors R0 to R2, the resistor R10, and the resistor Rv are set to be lower than the voltage at the input end of the. Further, at this time, it is apparent that the voltage at the second input terminal of the comparator C1 becomes lower than the voltage at the second input terminal of the comparator C2. The output signals of the comparators C1 and C2 are input to the control CPU, and the control CPU relays SW1 in accordance with the combination of the ON state and the OFF state.
The power supply to the electromagnetic coil in SW3 is controlled.
The control CPU refers to the table shown in FIG. 6, and energizes one of the electromagnetic coils in the relays SW1 to SW3 from the combination of the ON state and the OFF state of the output signals of both comparators C1 and C2. That is, when both the comparators C1 and C2 are both in the ON state, only the electromagnetic coil of the relay SW1 is energized, and when the comparator C1 is in the OFF state and the comparator C2 is in the ON state, only the electromagnetic coil of the relay SW2 is energized. When both comparators C1 and C2 are off, relay S
Energize only the electromagnetic coil of W3.

The electromagnetic switches of the relays SW1 to SW3 are electrically connected when the electromagnetic coils are energized, and are connected between the power supply lines in series with the indicator lamps L1 to L3, respectively. FIG. 7 shows an indicator 40 arranged inside the vehicle, and the surface of the three translucent lenses 41 has “O”.
The letters "K", "1/2", and "replacement" are written, and the indicator lamps L1 to L3 are provided on the back side of each of them. In this embodiment, the control unit 30 and the indicator are provided. The padware indicator display device is constituted by 40. Next, the operation of the present embodiment having the above-described configuration will be described.For the first time, when the probe 10 is assembled to the brake pad 22, the probe 10 is completely worn. Therefore, the resistance material 13 between the terminals 11 and 11 is still in the assembled state.In this state, the resistance value of the resistance material 13 remains at the initial setting, and the first resistance in both comparators C1 and C2 is maintained. The voltage at the input end of the resistor is the resistance R
It is lower than the voltage between R1 and R2. Therefore, both comparators C1,
The output signal of C2 is turned on, and the control CPU is shown in FIG.
With reference to the table, only the electromagnetic coil of the relay SW1 is energized. When the electromagnetic coil of the relay SW1 is energized, the electromagnetic switch is turned on, and the indicator lamp L1 is energized and lights up.
The lamp emits light on the back surface of the translucent lens 41 on which the character "OK" is written. Therefore, the driver can recognize the character "OK" and recognize that the wear amount of the brake pad is small.

Since the brake pad 22 wears as the brake is used, the probe 10 also approaches the brake disc 21 and gradually wears from the tip side.
When the probe 10 starts to wear, only the resin mold portion wears, but the resistance material 13 welded and fixed to the tip end side of the terminal 11 gradually begins to be exposed, and comes into contact with the brake disc 21 to be scraped. When the resistance material 13 is scraped off, the cross-sectional area cut in the wear direction gradually decreases. Since the resistance between the terminals 11 and 11 is proportional to the above-mentioned cross-sectional area, the resistance between the terminals 11 and 11 increases in proportion to the abrasion and the resistance material 13 is scraped off. When the resistance of the probe 10 increases in this way,
The voltage at the connection point between the resistor R10 and the resistor Rv connected between the power supply lines gradually increases. Then, although initially lower than the voltage between the resistors R1 and R2, when the resistance value of the resistor material 13 increases to some extent due to wear, the resistor R connected to the first input terminals of both comparators C1 and C2 is increased.
The voltage at the connection point between 10 and the resistor Rv becomes higher than the voltage between the resistors R1 and R2, and the output of the comparator C1 is turned off.

When the output of the comparator C1 is turned off and the output of the comparator C2 is turned on, the control CPU energizes only the electromagnetic coil of the relay SW2.
The electromagnetic coil of W1 becomes non-excited and the electromagnetic switch becomes non-conductive, and the indicator lamp L1 is turned off, while the electromagnetic coil of relay SW2 is excited and the electromagnetic switch becomes conductive, and the indicator lamp L2 is turned on. As a result,
In the indicator 40, the lamp emits light on the back surface of the translucent lens 41 on which the character "1/2" is written, and the driver recognizes the character "1/2" and says, "Although it is still sufficient, the brake pad It's getting worn out. " In this case, the driver does not have to replace the brake pad immediately, so there is no concern if the driver lights up during driving. Also, it is enough to make a maintenance inquiry after it lights up.
It is sufficient to set a replacement time and request maintenance.

If it is used further without being replaced, the sectional area of the resistance material 13 is further reduced and the resistance between both terminals 11, 11 is increased. When the brake pad 22 has almost disappeared and is about to be replaced, the resistance value of the resistance material 13 increases and the resistance R10 and the resistance R10 connected to the first input terminals of both the comparators C1 and C2. The voltage at the connection point with Rv is the resistance R
The voltage becomes higher than the voltage between 0 and R1, and the output of the comparator C2 is also turned off. As a result, the outputs of both comparators C1 and C2 are turned off, and the control CPU refers to the table of FIG. 6 to energize only the electromagnetic coil of the relay SW3, and the electromagnetic coil of the relay SW2 is de-energized. Then, the electromagnetic switch becomes non-conductive and the indicator lamp L2 is turned off, while the electromagnetic coil of the relay SW3 is excited to make the electromagnetic switch conductive and the indicator lamp L3 is turned on. As a result, in the indicator 40, the lamp emits light on the back surface of the light-transmitting lens 41 on which the word "replacement" is written, and the driver recognizes the character "replacement" and "wears as expected. It has progressed and reached the replacement time. " Therefore, you can replace it at the maintenance shop as informed.

In the case of the conventional type, since the person suddenly requests the replacement, some people may not be aware of the urgency, so that it is necessary to request the brake pad 22 with a sufficient margin. However, according to the present invention, it is possible to recognize that the second lighting of the lamp requires urgency because it has been previously announced. Therefore, it is sufficient to light the replacement lamp in a very marginal state, and effective use of resources can be achieved. As described above, in the probe 10, since the resistance material 13 serving as a conductive path is worn and reduced in proportion to the wear of the brake pad 22, the wear of the brake pad 22 can be detected as a resistance value, while the control is performed. The portion 30 controls the display of the indicator 40 that displays the wear amount in stages based on the resistance value that represents the wear amount, and accurately displays the wear amount of the brake pad 22.

In the above-described embodiment, the wear amount is displayed in three stages by the three indicator lamps, but the stages may be increased or displayed in an analog manner. In this case, the change in the resistance value may be represented by a voltage drop and the voltage may be displayed as the wear amount. In the embodiment described above, terminal 1
Although the resistance material 13 and the resistance material 13 are formed as separate parts, as shown in FIG.
Even if only a is made of a metal having a relatively high resistance value and the rear end portion 14b of the barrel side is made of a metal having a low resistance value, or if the whole is made of a resistance material. The resistance change becomes larger than the resistance change when the low resistance material wears, and the wear amount can be detected.

[Brief description of drawings]

FIG. 1 is a perspective view showing components of a probe for a padware indicator according to an embodiment of the present invention.

FIG. 2 is a perspective view showing components of the padware indicator probe.

FIG. 3 is a perspective view of a padware indicator probe.

FIG. 4 is a schematic configuration diagram of a padware indicator.

FIG. 5 is a schematic configuration block diagram of a control unit of the padware indicator.

FIG. 6 is a diagram showing a combination table.

FIG. 7 is a front view of an indicator.

FIG. 8 is a perspective view showing a modification of the padware indicator probe.

FIG. 9 is a perspective view of a conventional padware indicator probe.

FIG. 10 is a schematic configuration diagram of a conventional padware indicator.

[Explanation of symbols]

 10 ... Probe 11, 14 ... Terminal 11a ... Barrel part 12 ... Electric wire 13 ... Resistive material 21 ... Brake disc 22 ... Brake pad 30 ... Control part 40 ... Indicator 41 ... Translucent lens C1, C2 ... Comparator CPU ... Control CPU L1 to L3 ... Indicator lamps R0 to R2 ... Resistors R10, R11 ... Resistors SW1 to SW3 ... Relays

Claims (4)

[Claims] 1. A U-shaped electric line having a folded-back portion oriented to the side of the brake pad is arranged in a probe that wears together with the brake pad, and a circuit condition of the electric line is detected on a display unit to detect the brake pad. In the pad wear indicator for displaying the wear state of, the probe is configured such that the conduction path of the folded portion in the electric line is reduced in accordance with the wear, and the display unit detects the electric resistance of the electric line. And a wear amount display unit that displays the wear amount according to the detection result of the resistance detection unit. 2. A probe for a wear wear indicator, which has a U-shaped electric line with a folded-back portion oriented on the tip side and is held by a brake pad and wears together with the brake pad. A padware indicator probe that is made of a resistance material. 3. The padware indicator probe according to claim 2, wherein the electric line in the probe is a pair of low resistance lines oriented substantially parallel to the wear direction, and the brake pad of the low resistance line. A probe for a padware indicator, characterized in that the probe is provided with the above-mentioned resistance material disposed between the two at a side tip. 4. A U part having a folded portion oriented toward the brake pad in a probe that is worn along with the brake pad.
In a display device for a padware indicator that detects the circuit condition of a character-shaped electric line and displays the wear condition of the brake pad, a resistance detection unit that detects the electric resistance of the electric line and a detection result of the resistance detection unit. And a wear amount display means for displaying the wear amount according to the item.