KR20010017548A - cooling device for brake system of vehicle - Google Patents

Abstract

PURPOSE: A brake cooling apparatus extends the life of a tire, protects the damage of the brake system by heat and improves the braking efficiency by protecting the damage of the tire due to the over heating of a brake drum. CONSTITUTION: The water spray device cools a brake drum(12) by spraying atomized water between a wheel(11) and the brake drum(12) on braking. The water supply device supplies high pressured water adjusted to a constant pressure for the water spray device. The control device lets the water supply device operate definitely in a predetermined time after the water supply device starts and when the temperature of brake drum is higher than the critical temperature.

Description

Cooling device for brake system of vehicle

The present invention relates to an apparatus for cooling a brake of a vehicle during braking, in particular by spraying water for a predetermined time during braking to a space between a wheel on which a tire is mounted and a brake drum, and using the latent heat of evaporation of the sprayed water. The present invention relates to a brake cooling apparatus of an automobile which is capable of cooling braking performance by cooling high-temperature conduction heat received from a brake drum, as well as preventing tire melt fracture and excessive wear of friction materials due to overheating of the brake drum.

In general, the brake device of the vehicle is to reduce the vehicle speed by converting and reducing the speed energy of the vehicle into thermal energy due to friction. The brake device of the vehicle brakes a brake drum rotating at high speed while driving. The drum brake and the disk brake for braking the disk that rotates at high speed.

Here, the drum brake is brake drum 12 that is rotated integrally with the brake drum 12 while driving inside the wheel 11 on which the tire 10 is mounted, as shown in FIG. 1, and inside the brake drum 12. It is composed of a brake shoe 13 and the like attached with a friction material lining (not shown) on the front to press the brake drum 12 to stop or stop its rotation during braking.

Therefore, at the time of braking, the lining is in close contact with the inner circumferential surface of the brake drum 12 by the operation of the brake shoe 13 mounted on the front thereof, and this occurs between the brake drum 12 and the brake shoe 13. Due to the frictional force, the brake drum 12 is stopped or the braking speed is reduced.

However, when the lining is in close contact with the inner circumferential surface of the brake drum 12 by the expansion force of the brake shoe 13 during braking as described above, between the lining and the brake drum 12 to generate high temperature heat due to friction In this case, the generated high temperature heat is transferred to the wheel 11 through the brake drum 12, and the high temperature heat transferred to the wheel 11 is eventually transferred to the tire 10.

On the other hand, the friction heat generated by the friction between the lining and the brake drum 12 during braking as described above to the wheel 11 and the tire 10 may be partially cooled by air-cooled cooling by air introduced from the outside. When the brake is frequently used, the temperature of the brake drum 12 is excessively increased by frictional heat because the brake drum 12 is not sufficiently cooled by the air. Thus, the brake drum 12 is If the temperature rises excessively, the tire 10 mounted on the wheel 11 is damaged by melting due to heat and causing damage.

Accordingly, efforts are being made to prevent the tire 10 from being damaged by heat transferred from the brake drum 12 during braking through cooling the wheel 11 and the brake drum 12. .

Accordingly, the present invention has been made in view of the above-mentioned issues, and by spraying water into the space between the wheel and the brake drum on which the tire is mounted, the forced cooling of the brake drum raised by braking In addition, the object of the present invention is to provide a brake cooling apparatus of a vehicle which is capable of preventing damage to tires mounted on wheels and improving braking performance.

The present invention for achieving the above object, the water spray means for cooling the brake drum by spraying the atomized water into the space between the wheel and the brake drum during braking, and the high pressure of the water spray means adjusted to a constant pressure And water supply means for supplying water, and control means for operating the water supply means for a predetermined time after the start of braking and only when the temperature of the brake drum is raised above the threshold.

1 is a cross-sectional view schematically showing an installation state of a wheel on which a brake drum and a tire are mounted in a drum brake device of a conventional vehicle;

2 is a configuration diagram schematically showing a state in which the brake cooling device of the vehicle according to the present invention is applied to a drum type brake device.

<Description of the code | symbol about the principal part of drawing>

10-tire 11-wheel

12-Brake Drum 14-Injection Nozzle

16-Pump 19-Pressure Control Valve

23-brake pedal 25-pressure sensor

26-temperature sensor 27-water level sensor

28-alarm

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a block diagram schematically illustrating a state in which a brake cooling apparatus of a vehicle according to the present invention is applied to a drum type brake device, in which the same reference numerals are given to the same reference region as in FIG. Shall be.

As shown in the drawing, the water spray means for spraying the atomized water into the space between the wheel 11 and the brake drum 12 during braking, and the high pressure water adjusted to a constant pressure to the water spray means Water supply means for supplying, and control means for controlling the operation of the water supply means to be operated for a predetermined time after the start of braking.

The control means is limited to the case where the temperature of the brake drum 12 input from the temperature sensing means for sensing the temperature of the brake drum 12 is greater than or equal to the threshold temperature (temperature required to be cooled, about 400 ° C.). To operate the water supply means.

Here, the water supply means is a spray nozzle 14 disposed toward the space between the wheel 11 and the brake drum 12, and connected to the spray nozzle 14 to discharge the water supplied from the water supply means The water pipe 15 is composed of.

In addition, the water supply means is a pump 16 for compressing and sending water to supply the compressed water at high pressure to the injection nozzle 14 through the water pipe 15, and the water supplied to the pump 16 The storage tank 17 is configured to store a predetermined amount, and when the pressure of the water compressed at high pressure from the pump 16 is detected and compressed above a reference value, the storage tank 17 is stored again for protection of the injection nozzle 14 and the water pipe 15. It consists of a pressure regulating valve 19 mounted on the water pipe 15 for returning the drain conduit 18 to the tank 17.

On the other hand, the control means for controlling the starting point of operation of the water supply means by detecting this when braking, the control means for the wheel cylinder mounted on each wheel from the air storage tank 20 in which the compressed air is stored (21) The air pipe in the pneumatic brake device having a brake valve (24) which is opened in accordance with the operation of the brake pedal 23 on the air line (22) extending into the air pipe 22 to operate in communication with the air line (22). It is installed on the furnace 22 and connected to the pressure sensor 25 which detects the change of the air pressure in the pipeline and grasps the start point of braking.

In addition, unlike the above, the control means may be configured to detect the braking time via a detection means such as a position sensor (not shown) which detects the brake pedal 23 when it is rotated.

In addition, the control means is for controlling the start of the operation of the water supply means only when the temperature of the brake drum 12 is heated above the threshold during braking, for this purpose, the control means is the temperature of the brake drum 12 It is connected to the temperature sensor 26 mounted on the brake drum 12 side to detect the.

In addition, the brake cooling apparatus of the present invention senses the amount of water storage for smooth operation of the water supply means by supplementing it when the amount of water in the storage tank 17 storing the predetermined amount of water in the water supply means falls below a certain amount. It is provided with a means, the water storage amount detecting means is composed of a water level sensor 27 mounted on the storage tank 17 side to measure the level of water stored therein, the water level sensor 27 Is connected to the control means.

In addition, the brake cooling device of the present invention is provided with a warning means for the purpose of warning the driver or the operator when the amount of water in the storage tank 17 detected by the water storage amount detection means, the warning means is It is composed of an alarm device 28 for generating a warning sound or lighting the warning light under the control of the control means according to the amount of water input from the water level sensor 27 for detecting the residual amount of water stored in the storage tank 17. This alarm device 28 is also connected to the control means.

On the other hand, the control means detects this when braking to operate the pump 16 of the water supply means for a predetermined time, and sprays the high pressure water through the water spray means between the wheel 11 and the brake drum 12, Control unit (ECU), which is logic to operate the alarm device 28 of the warning means via the water storage amount sensing means for detecting when the storage amount of water in the storage tank 17 of the water supply means is insufficient. .

In addition, the brake cooling apparatus of the present invention has a low ambient temperature, such as during rainy weather or in winter, when the temperature of the brake drum 12 does not increase when the braking temperature is higher than a threshold value. In order to forcibly limit, an on / off switch 30 is provided between the control means and the battery 29 which is the power supply of the vehicle.

Hereinafter, the operation and effects of the brake cooling apparatus according to the present invention will be described in detail.

First, the pressure sensor 25 detects a change in pressure on the air line 22 installed between the air storage tank 20 and the wheel cylinder 21 according to the pressurization of the brake pedal 23 during braking while driving. When applied by means, the control means operates the pump 16 of the water supply means for a few seconds (approximately 2 seconds) necessary for cooling the brake drum 12, and according to the operation of the pump 16, the storage tank. (17) The water in the atomization is atomized and sprayed through the injection nozzle 14 of the water spray means arranged in the space between the wheel 11 and the brake drum 12 through the water pipe 15 to the high pressure. The break drum 12 is cooled by the droplets of fine particles.

At this time, the temperature of the brake drum 12 is controlled under the control of the water supply means only when the temperature rises above the threshold due to friction with the brake shoe 13, which is controlled by the brake drum 12 side. It is made by the temperature sensor 26 is installed adjacent to measure the temperature thereof and send a signal to the control means.

Accordingly, when the temperature of the brake drum 12 rises to a high temperature above a threshold value when braking as described above, the brake drum 12 may be cooled by the control means, the water supply means, and the water spraying means, so that the brake drum 12 may be removed from the brake drum 12. Since the heat transferred to the tire 10 via the wheel 11 is weak, the tire 10 is not damaged by heat.

When the residual amount of water stored in the storage tank 17 of the water supply means is insufficient, the water level sensor 27 detects this and causes the control means to operate the alarm device 28 of the warning means so that the driver or the maintenance person can It makes it easy to recognize the lack of water.

On the other hand, the switch 30 is the operation of the control means to exclude unnecessary operation of the cooling device in the case of the temperature of the brake drum 12 does not rise above the threshold value during braking due to low ambient temperature, such as during rain or winter It is used to artificially cut off the operating power of the battery 29 necessary for the intermediate.

As described above, according to the brake cooling apparatus of an automobile according to the present invention, the tire mounted on the wheel is not damaged by heat transmitted from the brake drum heated at high temperatures during frequent braking, thereby improving the durability life of the tire. Of course, there is also an effect that can prevent damage to the components due to heat in the braking system, and contribute to the improvement of the braking performance.

Claims (4)

Water braking means for cooling the brake drum 12 by spraying atomized water into the space between the wheel 11 and the brake drum 12 during braking, and supplying the water spraying means with high pressure water adjusted to a predetermined pressure. A brake cooling apparatus for a vehicle, comprising: water supply means; and control means for operating the water supply means for a predetermined time after the start of braking and only when the temperature of the brake drum 12 rises above a threshold. 2. The spray nozzle according to claim 1, wherein the water supply means includes an injection nozzle (14) mounted at the tip of the water pipe (15) so as to be disposed toward a space between the wheel (11) and the brake drum (12). The pump 16 provided to supply the compressed water to the pump, the storage tank 17 storing the water supplied to the pump 16, and the pressure of the water compressed from the pump 16 is higher than the reference value. A pressure regulating valve (19) mounted on the water pipe (15) for returning the compressed water back to the storage tank (17) for the protection of the spray nozzle (14) and the water pipe (15) via the drain line (18). Brake cooling apparatus for a vehicle, characterized in that configured to include. The method of claim 1, wherein the control means is installed on the air line 22 extending from the air storage tank 20 in which the compressed air is stored into the wheel cylinders 21 mounted on each wheel to change the air pressure in the line. It is connected to the pressure detecting sensor 25 to detect the braking time to control the starting point of the water supply means, the temperature sensing mounted on the brake drum 12 side to sense the temperature of the brake drum 12 The brake cooling device of a vehicle, characterized in that it is connected to the sensor (26) to detect the temperature of the brake drum 12 to determine whether the water supply means is operating. According to any one of claims 1 to 3, wherein the control means is connected to the water level sensor 27 is installed on the storage tank 17 side to sense the amount of stored water, and the alarm device to notify the outside when there is a lack of water The brake cooling apparatus of the vehicle, characterized in that it is also connected to (28) to warn the state of water shortage.