KR20070065104A - A cooling system for brake oil - Google Patents

Abstract

A brake fluid cooling apparatus using a circulation unit is provided to exclude a separate circulation pump by using a principle in which a brake fluid is returned by the pressure difference between the operation of the brake and the release of the brake. In a brake fluid cooling apparatus using a circulation unit, a brake fluid in a brake tube(6) is extruded by the pressure of a booster to which a pressure due to a brake pedal(1) is applied. A piston in the interior of the brake cylinder is moved to bring a brake pad(4) into contact with a brake disc to operate a brake. One end of the cooling passage is fixed so as to be communicated with the brake tube and the other end thereof is fixed so as to be communicated with the brake cylinder. A thermostat is fixed to an end of the cooling passage. An interruption valve(12) is installed at an end of an existing passage.

Description

Brake fluid cooling device using a circulation device {A COOLING SYSTEM FOR BRAKE OIL}

1 is a schematic view showing a conventional brake system.

2 is a view showing a state before the brake fluid is heated in the brake fluid cooling apparatus using the circulation device of the present invention.

3 is a view showing a state in which the brake fluid is heated and the thermostat is opened in the brake fluid cooling device using the circulation device of the present invention.

 <Description of Symbols for Main Parts of Drawings>

1: brake pedal 2: booster

3: brake disc 4: brake pad

5 brake cylinder 6 brake tube

7: piston 10: brake cylinder

11: cooling passage 12: shutoff valve

13: thermostat 14: heat dissipation unit

The present invention relates to a cooling device for the brake fluid, and more particularly, to a brake fluid cooling device using a circulation device to fundamentally prevent the brake vapor lock phenomenon to increase the stability and reliability of the brake to promote the safety of the passengers. .

The brake, or braking device, is a safety device that is installed to decelerate or stop a driving car and maintain a parking state.

Since the braking device is configured to press the rotating body with the friction member of the fixed body to reduce or completely stop the rotation speed of the rotating body, braking heat is generated between the rotating body and the friction member during braking.

The braking device has a rotating body such as a brake drum or a brake disk, and a brake pad (lining) is a friction member. The lining is attached to the brake shoe to brake by a wheel cylinder in the case of hydraulic type, and the brake in the case of pneumatic type. As the compressed air is supplied to the chamber, the piston is pushed to rotate the slack adjuster to bring the cam issue into close contact with the drum.

However, such a braking device, since the compressed air used for braking after the braking is to be released to the atmosphere, it is impossible to prevent the braking system from overheating by the heat generated by the friction of the drum and lining during braking.

On the other hand, as proposed in Japanese Utility Model No. 57-122460, a method of detecting this braking during braking and spraying compressed air between the rotating body and the friction member is known.

However, this method is inevitably to be used in the hydraulic braking device, because it can not discharge the hydraulic pressure used for braking to the atmosphere in the case of the hydraulic pressure must use a separate compressed air generating means.

And this type of cooling device does not achieve satisfactory cooling effect because compressed air is injected during braking, that is, air is supplied while the drum and lining are in contact.

As the brake is frequently applied for braking while driving, friction heat is generated from the disc brake. Accordingly, the friction coefficient of the brake pad decreases. If the brake pad is severe enough, the brake braking ability is degraded, causing a large accident. Is called a fade phenomenon.

In addition, if the brake is used a lot when descending the steep slope for a long time, the brake fade phenomenon is severely generated, causing the brake fluid to overheat, resulting in a loss of braking force of the brake.

In addition, as the weight of the vehicle is heavier, the above phenomenon is more severe, and thus a device for cooling frictional heat generated from the disc brake during braking is required.

In the conventional brake cooling apparatus used for this purpose, a dual brake and a quick relay valve are connected between a pneumatic tank for storing compressed air and a brake drum as described in Korean Utility Model Publication No. 93-8412 through a pipeline. It is provided, and the brake chamber which has a movable valve via the said quick relay valve and a port is connected and comprised.

Another conventional device is configured by forming an air passage between the friction surface of the disc brake and the friction surface to cool by using air generated during driving.

However, the conventional brake cooling apparatus as described above allows the compressed air in the pneumatic tank to flow into the brake drum through the quick relay valve to cool the frictional heat generated in the brake, but this is sealed by the drum. Cooling by using compressed air in a predetermined place to cool the friction heat generated in the drum in a closed place there was a problem of low cooling efficiency.

In the latter case, an air passage is provided between the friction surface and the friction surface of the disc brake to allow the wind generated during the driving of the vehicle to pass through the air passage, thereby cooling the frictional heat. Since the vehicle speed is lowered and the brake is frequently used, there is a problem in that the cooling effect is lowered and the braking force of the brake is lowered.

Among the various methods for cooling the brake fluid, there is a method of circulating the brake fluid itself through a plurality of flow paths.Because the brake fluid itself is dispersed into the cooling flow path, the brake fluid itself is disadvantageous in hydraulic formation and there are several complicated flow paths, so that the breakage of the brake tube It is disadvantageous and the like, there is a disadvantage in that the cost is increased because the structure is complicated and requires many parts, such as installing a separate circulation pump.

The present invention has been made in order to solve the problems described above, to quickly cool the brake fluid stored in a separate cooling passage and the cold brake fluid thermostat stored in a separate cooling flow path for rapid cooling of the brake quickly The purpose of the present invention is to provide a brake fluid cooling device using a circulator that does not use a separate power unit for circulating brake fluid by having a time that the heated brake fluid can be sufficiently cooled by being replaced. have.

According to the present invention, the brake fluid in the brake tube is extruded by the pressure of the booster applied by the brake pedal to move the piston inside the brake cylinder at high pressure, thereby rubbing the brake pad with the brake disc to operate the brake. In the brake device to be fixed, one end of the cooling passage is fixed so as to communicate with the brake tube, and the other end of the cooling passage is fixed so as to communicate with the brake cylinder, and the thermostat is fixed to the end, the end of the existing flow path flowing into the brake cylinder Characterized in that the shut-off valve is installed, the cooling flow path is formed in the spiral heat dissipation is cooled by air, the shut-off valve in conjunction with the thermostat to operate when the thermostat is opened, the thermostat is activated when the brake fluid is overheated To return the cooling fluid It is closed by the shut-off valve to be recovered, at the time of the brake operation and provides a brake fluid cooling device using a circulating apparatus that is characterized in that the shut-off valve is opened at the same time maintaining the pressure in the cooling flow path to the existing flow.

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

The terms or words used in this specification and claims are not to be construed as being limited to the common or dictionary meanings, and the inventors may appropriately define the concept of terms in order to explain their invention in the best way. Based on the principle, it should be interpreted as meaning and concept corresponding to the technical idea of the present invention.

According to the present invention, the brake fluid in the brake tube 6 is extruded by the pressure of the booster 2 acting on the pressure of the brake pedal 1 to move the piston 7 inside the brake cylinder 5 at a high pressure to brake pads. A conventional brake device is used in which (4) is rubbed with the brake disc 3 to make the brake work.

One end of the cooling passage 11 of the present invention communicates with one side of the brake tube 6, and the other end of the cooling passage 11 communicates with one side of the brake cylinder 10.

The cooling passage 11 has a heat dissipation portion 14 formed in the middle, and the heat dissipation portion 14 is cooled by an air inflow according to the progress of the vehicle as the cooling passage 11 is spirally twisted to increase the surface area. Cooling flow path 11 is formed relatively thinner than the existing flow path to increase the cooling efficiency by slowing the flow rate of the brake fluid. It plays a role of circulation and storage of the superheated brake fluid according to the opening of the thermostat installed at the end.

The thermostat 13 is installed at the end of the cooling passage 11 connected to the brake cylinder 10, and when the temperature of the brake fluid rises above a predetermined temperature, the thermostat is opened to allow the brake fluid to flow into the cooling passage 11. .

A shutoff valve 12 is installed at an end of an existing brake tube 6 connected to the brake cylinder 10. The shut-off valve 12 works in conjunction with the thermostat 13 to operate when the thermostat 13 is opened, and when the thermostat is closed, the shutoff valve 12 remains open regardless of the operation of the brake. To make it work.

However, when the valve is operated, the shutoff valve 12 has a structure that opens only in a single direction so that the brake is operated to open naturally when the brake fluid is pushed into the cylinder, and when the brake is released and the brake fluid is returned, the brake flows in the opposite direction. Allows the liquid to flow into the cooling passage rather than the existing passage.

Thermostat, also called thermostat or thermostat, is used in thermostats and electric furnaces to keep the temperature constant for a long time. The thermostat is an automatic switch placed in a heating device, such as an electric stove or electric blanket, which opens when the temperature rises and closes when the temperature goes down. Most used for this is bimetal. Bimetal is a joining of two alloy plates with different coefficients of linear expansion, and the degree of bending of bimetal's bow changes according to temperature changes.

Alloys used in bimetals are alloys of iron and nickel with the smaller coefficient of expansion, and alloys such as copper and zinc, nickel-manganese-iron, nickel-molybdenum-iron, and so on. In addition, some vaporization pressures of liquids that are easy to vaporize are used. Toluene is encapsulated in a tube and used for purposes such as bimetal by expansion and contraction by temperature.

2 illustrates a case where the brake fluid is not overheated, the thermostat 13 is blocked, and the brake fluid inside the cooling flow passage 11 stops the flow and is cooled and stored by the heat dissipation structure. When the brake is operated, the brake fluid flows only through the existing flow path, and at this time, the shutoff valve 12 is always in an open state and becomes the same state as the existing brake.

3 illustrates a case in which the thermostat is opened due to overheating of the brake fluid, and when the thermostat 13 is opened, the shutoff valve 12 also starts to operate, opens when the brake is operated, and closes when released. ) Allow the internal brake fluid to circulate.

When the brakes operate, all of the flow paths are opened, but most of the brake fluid flows through the existing flow paths rather than the cooling flow passages 11.

When the brake is released, the pressure from the booster is released and the brake fluid inside the cylinder in which the high pressure is formed is returned through the flow path. At this time, the shutoff valve 12 is closed and the existing flow path is blocked. Therefore, the brake fluid flows through only the cooling passage 11 to pass through the heat radiating portion 14, and the brake fluid passing through the heat radiating portion 14 is cooled by air.

As the brake fluid circulates through the brake tube 6 and the existing flow path by the repeated operation of the brake, the superheated brake fluid is replaced. When the circulation is completed and the temperature inside the brake cylinder decreases, the thermostat 13 The brake fluid in the cooling passage 11 is closed until the next circulation point.

As described above, the present invention fundamentally solves the vapor lock phenomenon of the existing brake system.

By using the principle that the brake fluid is returned by the pressure difference between brake operation and release, no separate circulation pump is needed, and the cooling flow path is opened only when necessary to increase the time for which the brake fluid stays in the cooling flow path. It is effective to increase.

In addition, the present invention is a device that prevents vapor lock phenomenon by cooling the brake fluid inside the brake cylinder, and by installing a cooling passage having a heat dissipation structure outside the brake cylinder, the brake fluid can be cooled to increase the brake performance, and the pressure inside the cylinder Because of the use of a car, the structure is simple, such as no need for a circulating pump, and thus, the cost is small and the cooling efficiency can be increased by operating only when necessary.

Claims (4)

In a brake device in which the brake fluid in the brake tube is extruded by the pressure of the booster acting by the brake pedal to move the piston inside the brake cylinder at high pressure, thereby rubbing the brake pad with the brake disc to operate the brake. Fixing one end of the cooling flow path to communicate with the brake tube, and fixing the other end of the cooling flow path to communicate with the brake cylinder, and fixed to install the thermostat at the end, and installs a shut-off valve at the end of the existing flow path flowing into the brake cylinder Brake fluid cooling device using a circulator. The brake fluid cooling apparatus according to claim 1, wherein the cooling passage has a spiral heat dissipation portion that is cooled by air. The brake fluid cooling device according to claim 1, wherein the shutoff valve is operated in conjunction with the thermostat to operate when the thermostat is opened. The method of claim 1, wherein when the brake fluid is overheated, the thermostat is operated to close the shutoff valve so that the brake fluid is recovered through the cooling flow path when the brake fluid returns, and the brake valve is opened during the brake operation to maintain pressure at the same time. Brake fluid cooling device using a circulating device, characterized in that.

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