JP2799851B2 - Brake pad - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a brake pad used for a brake device of an automobile, a motorcycle and the like.

[0002]

2. Description of the Related Art Disc brakes are widely used as brake devices for automobiles and the like. The general configuration is shown together with FIG. The disc brake A is composed of an oil system 11, a brake caliper 1
2, a caliper piston 13 built therein, and a brake pad 15 pressed against the disk rotor 14 by the caliper piston 13. The disk brake A having such a configuration is configured to sandwich the disk rotor 14 that rotates with the wheel between the brake pads 15 and 15 to obtain a braking force. A typical brake pad 15 will be described with reference to FIG. Brake pad 1
Reference numeral 5 includes a lining 15a made of a material having a high frictional resistance such as asbestos, asbestos, and sintered alloy, and a backing plate 15b made of a steel plate because the disk rotor 14 rotates at a high speed. These are integrally formed by molding (hot press molding) or riveting. Since the use of asbestos is regulated due to pollution problems that have a negative effect on the human body,
Recently, the use of sintered alloys has become common.

[0003]

In the disk brake having such a structure, since each part is hardly deformed, a uniform braking force can be always obtained, and when the brake is applied while braking at high speed or braking down a long downhill. In addition, a fade phenomenon (fade) in which the braking effect is deteriorated due to a decrease in the coefficient of friction between the brake pad and the disk rotor, and a vapor lock in which the heat is transmitted to the oil system 11 to generate air bubbles in the oil are less likely to occur. Has the advantage of

However, since the disc brake presses the brake pad 15 against the disc rotor 14, when used for a long time, frictional heat is generated between the lining 15a made of a friction material such as a sintered alloy and the disc rotor 14. . This frictional heat is generated by the disk rotor 1
Since 4 is bare, heat is naturally dissipated, and heat can be dissipated effectively by using aluminum wheels that have excellent heat dissipation properties. However, if the use of the foot brake on long downhills becomes excessive, The heat radiation cannot catch up with the temperature rise, and the above-mentioned fade phenomenon and vapor lock occur. When a fade phenomenon and a vapor lock occur due to an increase in the temperature of the brake pad, the braking effect naturally deteriorates, causing an accident. further,
If such inefficiency occurs unevenly between the wheels, the braked vehicle will cause the rear wheel side to spin and jump into the oncoming lane, or to turn at high speed, etc. It is a danger.

[0005] Since it is generally difficult to know in advance the fade phenomenon and the vapor lock caused by the excessive use of the brake, it has conventionally been avoided to use the foot brake excessively and to promote the combined use with the engine brake. A passive approach was taken.

Further, since the brake pad 15 is pressed against the disk rotor 14, the lining 15a naturally wears, and as the degree of wear increases, the braking force decreases, the braking distance increases, and an accident may occur. Therefore, the lining 15a needs to be replaced before the braking force is reduced due to wear. Conventionally, such replacement has been carried out by a driver who has noticed that the brakes are not working properly, brings the vehicle to a maintenance shop, a gas station, or the like, or performs a legal inspection. However, in recent years, the rapid spread of driver licenses has increased the number of drivers who are indifferent to the structure of the vehicle. You will be late.

According to the present invention, the driver is notified before the above-mentioned fade phenomenon due to the heating of the brake pad and the vapor lock occurs, and the temperature difference between the brake pads is displayed, whereby the braking effect becomes uneven. The purpose of the present invention is to provide a brake pad that can prevent a traffic accident caused by poor braking performance by notifying a driver in advance of a decrease in braking force due to wear of the brake pad. And

[0008] Furthermore, with the spread of motor sports in recent years, circuit places for competing in speed have been established in various places, and speed races held both in Japan and overseas have attracted much interest mainly by young people. In the circuit race in this circuit, since the direction of the circuit is determined, it may be required to make a slight difference in the braking effect between the left and right wheels. For example, in the case of a counterclockwise course, a safe and quick cornering is possible by always making the braking effect of the left wheel stronger than that of the right wheel. Traditionally, this kind of adjustment was done by a mechanic based on experience after a test run before the start of the race, based on the driver's opinions.
However, since the adjustment mainly depends on intuition, a difference in recognition easily occurs between the driver and the mechanic, and as a result, there is a problem that an effective adjustment cannot be performed. The present invention relates to a brake pad which can easily perform fine adjustment of the effectiveness of each brake by knowing the temperatures of the left and right brake pads and the disk rotor for a vehicle used in an automobile race competing for such speed. It is also intended to provide.

[0009]

SUMMARY OF THE INVENTION The present invention achieves these objects by pressing a brake pad against a disc.
The front wheels or
Are the brake pads attached to the rear wheels or front and rear wheels.
Backing with lining and lining attached
Plates are provided with through holes, and thermocouples are placed in each through hole.
Sensor with its tip slightly protruding from the lining.
So that each sensor has its own brake pad and
And the temperature of each disk rotor.
Each sensor connected to each instrument connected by the lead wire derived from
By displaying the measured value of each brake
Senses the temperature difference between the wheels and pre-determines the uneven braking force between the wheels.
It is characterized by being able to know.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a brake pad according to the present invention will be described with reference to FIGS. 1, 2 and 3. FIG. FIG.
2 is a side view of the brake pad according to the present invention, and FIG. 3 is a schematic view showing an example of a connection between the brake pad and an instrument. Reference numeral 1 denotes a brake pad including a backing plate 2 and a lining 3 formed integrally with the backing plate 2 and a friction material such as asbestos or a sintered alloy. In FIG. 1, the sensor 4a has a hole formed in a side surface of the lining 3, and is embedded and fixed in the hole. In mounting the sensor 4a, in addition to sealing and molding by thermal compression at the time of molding of the brake pad 1, the tip may be inserted into a fine hole opened by a drill or the like in the lining 3 after molding and fixed by welding or the like. . The mounting position of the sensor 4a is set to a position having a margin more than a position where a sufficient braking force cannot be obtained due to wear of the lining 3. Further, the tip of the sensor 4a is
It is bent and inserted into the inside as shown in FIG. 1 and fixed. In addition, an oblique fine hole may be opened in the lining 3, and the tip of the sensor 3a may be inserted and fixed therein.

In FIG. 2, the sensor 4b is inserted into a hole provided substantially through the backing plate 2 and the lining 3 substantially at the center of the brake pad 1, and its tip projects slightly from the surface of the lining 3 to weld it. Is fixed by The mounting position of the sensor 4b is not particularly limited. However, in order to effectively know the entire temperatures of the disk rotor 14 and the lining 3, it is preferable that the center of the brake pad, which is the center of the contact surface, be located.

As the sensors 4a and 4b, use is made of thermocouples in which two different metals are combined and a current is generated when there is a difference between the temperatures of the right and left contacts. This sensor 4
As the thermocouples used as a and 4b, those that react at a temperature lower than the temperature at which the temperature of the lining 3 increases due to frictional heat and a fade phenomenon occurs are used. The other end of each of the sensors 4a and 4b is connected to a warning light in a driver's seat or an instrument having a warning buzzer. FIG. 3 shows an example of the connection. Brake pads 1a, 1 attached to left and right wheels
The leads 5a and 5b derived from the respective sensors b are connected to the instrument 6 on the dashboard. The instrument 6 has a scale capable of indicating a temperature difference measured by a thermocouple, and further includes a warning light 6a or a buzzer for notifying a rise in the brake pad above a set temperature and excessive wear.

FIG. 3 shows the display of the temperature difference between the brake pads attached to the left and right wheels.
It is also possible to use a lead wire derived from a sensor fixed to each brake pad and connected to a separate instrument.

Next, the actual use of the brake pad of the present invention having the above-described structure will be described. Depressing the foot brake causes the brake pad 1 pressed against the disk rotor 14 to stop the rotation of the disk rotor 14, but causes the friction lining to increase the temperature of the lining 3. When the temperature exceeds a preset temperature, the warning light 6a in the instrument 6 is turned on, and the driver is informed that if the use of the foot brake is continued as it is, a fade phenomenon and a vapor lock will occur and the braking effect will deteriorate. The driver who notices the abnormal temperature rise of the brake pad by the warning light 6a immediately stops the vehicle in a safe place, waits for the warning light to be extinguished, and for the temperature of the brake pad to become normal. Further, even during the normal operation, the temperature difference of the brake pad measured by the thermocouple is displayed on the scale of the instrument 6. That is, the temperature difference indicates that there is a difference in frictional heat generated between the brake pads, and it is understood that the effects of the left and right brakes are uneven. The driver who knows this fact may receive necessary maintenance including replacement of brake pads at a maintenance shop or a gas station. Further, when the brake is worn for a long time, the lining 3 is worn down to the dotted line in FIG. 1 and the sensor 4a is uncovered. Warning light 6a continues to light to inform the driver of brake pad wear. The warning light 6a is turned on both when the temperature of the brake pad rises and when it is worn. When the temperature rises, the warning light 6a is naturally turned off when the temperature is lowered. Can be distinguished.

When the sensor 4b shown in FIG. 2 slightly protrudes from the surface of the lining 3 of the brake pad 1, when the foot brake is depressed, the tip contacts the disk rotor 14 to measure the temperature. 6 is displayed.

[0016]

Since the brake pad according to the present invention having the above-described structure measures the surface temperature and the remaining amount of the brake pad, a fade phenomenon caused by an increase in the temperature of the brake pad due to an excessive braking operation, and the like. It is possible to prevent the braking effect due to the vapor lock from being deteriorated beforehand and to know in advance that the braking force has decreased due to the wear of the brake pad, so that a braking accident can be prevented. Further, when the brake pad shown in FIG. 2 in which the sensor slightly protrudes from the surface of the lining of the brake pad is connected to an individual instrument and used, the temperature between each brake pad and the disk rotor can be measured. Fine adjustment of the effects of the left and right brakes can be easily performed without any special experience. Further, in the structure of the brake pad according to the present invention, in addition to integrally forming the tip of the sensor by molding at the same time as the conventional manufacturing of the brake pad, a hole can be opened by a drill or the like and fixed by welding or the like. It does not require special equipment, technology, etc., and can be supplied at low cost. In particular, in the case where the tip of the sensor is bent in the lining or attached diagonally, the sensor's sensing ability can be further enhanced.
Furthermore, in actual use, it can be used in the same manner as a conventional brake pad, and since only wiring to the dashboard is required, it can be easily applied to existing vehicles, and has many other advantages. Has the effect.

[Brief description of the drawings]

FIG. 1 is a side view of a brake pad according to the present invention.

FIG. 2 is a side view of a brake pad according to the present invention.

FIG. 3 is a schematic view showing an example of a connection between a brake pad and an instrument according to the present invention.

FIG. 4 is a perspective view showing the entire brake pad.

FIG. 5 is a schematic view showing the entire disc brake.

[Explanation of symbols]

 Reference Signs List 1 brake pad 2 backing plate 3 lining 4a sensor 4b sensor 6 instrument 6a warning light

Claims (1)

(57) [Claims] 1. A system in which a brake pad is pressed against a disc.
For front and rear wheels in powered disc brakes
Lining for each brake pad attached to the wheels or front and rear wheels
Backing pre-applied with lining and lining
A through hole is provided in the port, and a thermocouple is inserted in each through hole.
The tip of the sensor protrudes slightly from the lining
So that each sensor has its own brake pad and
Always measure the temperature of each disk rotor and derive from each sensor.
The measurement of each sensor is connected to each instrument connected by the
Each brake pad is displayed by displaying the fixed value
Senses the temperature difference between the wheels and knows in advance the uneven braking force between the wheels.
Brake pad characterized by being able to do.