KR20070043432A - Apparatus for increasing power of brake booster for vehicle - Google Patents

Abstract

 It is an object of the present invention to provide a power boosting device of an automobile brake booster which can improve the brake performance by increasing the speed of response during brake operation and increasing the pressure difference between intake negative pressure and atmospheric pressure for the driver's safety;

A power piston connected to the push rod of the master cylinder and axially movable inside the power cylinder, a diaphragm installed on an outer circumference of the power piston and partitioning the inside of the power cylinder into a front chamber and a rear chamber; In a brake booster of an automobile having a valve plunger coupled to a power piston coaxially with a push rod, a key for preventing the valve plunger from escaping and an invalid stroke in a booster, and an input rod connecting the valve plunger to a brake pedal. ,

Increased power of automobile brake booster by connecting high pressure air supply means to supply high pressure air pressurized by the heat of exhaust manifold when the brake pedal is operated at the neck rear side of the wave cylinder supplying atmospheric pressure to the rear chamber. Provide the device.

Heating tank. Air tank. Reservoir

Description

Apparatus For Increasing Power Of Brake Booster For Vehicle}

1 is a system diagram of a brake booster boosting device according to the present invention.

Figure 2 is an enlarged cross-sectional view of the main portion extract of Figure 1;

3 is a cross-sectional view of a conventional brake booster.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brake of an automobile, and more particularly, to an apparatus for increasing power of an automobile brake booster, which enables to obtain a large braking force even with a small foot force.

In automobiles, the brake is divided into a foot brake operated by the driver's foot while driving and a parking brake operated by hand when parking. Since the double foot brake is used during driving, the brake can be easily and quickly operated with little force. For this purpose, the foot brake (hereinafter referred to as 'brake') is mainly used as a hydraulic brake that can be reliably braked with a relatively low effort.

In recent years, a large braking force is required as an automobile becomes larger and faster, and a hydraulic brake has a limitation in increasing braking force due to its structural characteristics.

Accordingly, it is common to equip the hydraulic brake with a booster, which is a booster, to generate several times the braking force even at the same turning force, so that it is possible to reliably brake a high speed and a large vehicle with little turning force.

Such brake boosters are roughly classified into a vacuum type using a differential pressure between a vacuum generated in an intake manifold or a vacuum pump and a compressed air type using a pressure of compressed air.

In the brake booster as described above, looking at the conventional configuration of the vacuum brake booster related to the present invention, it is configured as shown in Figure 3, the brake booster 100 is not shown between the brake pedal and the master cylinder (C) not shown. Is placed.

The brake booster 100 is pushed by the input rod 102 and the valve plunger 104 elastically rearward by the rod return spring 106 in a state where the brake pedal is not pressed, so that the valve poppet 108 is a power piston. The vacuum valve 112 of the 110 is opened and the air valve 114 of the valve plunger 104 is closed.

Accordingly, the negative pressure (vacuum) generated in the intake manifold or the vacuum pump is supplied to the front chamber 120 of the power cylinder 118 through the check valve 116 and the negative pressure flow path 122 and the air of the power piston 110 are Since it is also supplied to the rear chamber 126 through the flow path 124, the power piston 110 is to be kept pushed back by the return spring 106.

When the brake pedal is pressed for braking in such a state, the input rod 102, the valve poppet 108, and the valve plunger 104 are moved forward, whereby the vacuum of the power piston 110 is caused by the valve poppet 108. The valve portion 112 is closed and the air valve portion 114 of the valve plunger 104 is opened while being separated from the valve poppet 108 by the continuous movement of the input rod 102.

Therefore, the external atmosphere is introduced into the rear chamber 126 of the power cylinder 110 through the air valve portion 114 of the valve plunger 104 and the valve poppet 108. Force is added to force the push rod 128.

In this case, the driver's response force and the power ratio of the push rod 128 are always kept constant by the reaction force rubber, and when the power ratio of the booster is balanced, the valve plunger 104, the valve poppet 108, and the power piston ( The vacuum valve unit 114 of 110 is to be closed.

However, the conventional brake booster configured as described above has a problem in that the response speed of the booster is slow because the valves are operated according to the inflow velocity of air naturally introduced through the rear of the booster.

In addition, the negative pressure has a lot of changes depending on whether the air conditioner affects the power performance of the car, and there is a problem that even if the negative pressure is insufficient, the brake slippage occurs, which causes one of the major accidents. .

Therefore, the present invention has been invented to solve the above problems, the present invention is to improve the brake performance by increasing the speed difference between the intake negative pressure and atmospheric pressure for the driver's safety and speed up the operation of the brake. It is to provide a power boost device of the automobile brake booster.

In order to realize this, the present invention, the power piston is connected to the push rod of the master cylinder and installed axially movable in the interior of the power cylinder, and installed on the outer periphery of the power piston inside the front cylinder and the rear A diaphragm partitioning into the chamber, a valve plunger coupled to the power piston coaxially with the push rod, a key for preventing separation of the valve plunger and invalid stroke in the booster, and an input rod connecting the valve plunger to the brake pedal. In the brake booster of the automobile provided,

Increased power of automobile brake booster by connecting high pressure air supply means to supply high pressure air pressurized by the heat of exhaust manifold when the brake pedal is operated at the neck rear side of the wave cylinder supplying atmospheric pressure to the rear chamber. Provide the device.

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

1 and 2 are a sectional view showing the configuration of the power boosting apparatus according to the present invention, and the main portion of the brake booster in order to help understand the configuration of the brake booster, the reference numeral 2 denotes a brake booster.

The brake booster 2 is installed in the power cylinder 4 such that the power piston 6 is axially movable, and the inside of the power cylinder 4 is disposed on the outer circumferential surface of the power piston 6 in the front chamber 8. The diaphragm 12 which partitions into the rear chamber 10 is provided.

In addition, a return spring 14 is installed in the front chamber 8 of the power cylinder 4 to push the power piston 6 toward the rear chamber 10, and the power piston 6 moves toward the front chamber 8. It is connected to the push rod 16 of the protruding master cylinder MC.

In addition, a check valve 18 for supplying a negative pressure generated from an intake manifold or a vacuum pump to the front chamber 8 is installed at one side of the power cylinder 10, and the power piston 6 is provided with a power cylinder 6. Negative pressure flow paths 20 for communicating the front and rear chambers 8 and 10 of the () and air flow paths 22 for guiding the outside atmosphere to the rear chamber 10 are respectively formed.

In addition, the valve plunger 26 is coupled to the operation hole 24 in the center of the power piston 6 so as to be movable in a predetermined stroke. The valve plunger 26 is connected to a brake pedal not shown through the input rod 28. Connected.

At this time, a constant gap is formed between the outer periphery of the tip of the valve plunger 26 and the inner periphery of the operating hole 24 of the power piston 6 so that negative pressure and air can flow. The valve plunger 26 has a power piston. A key 27 is provided which serves to prevent deviation from (6) and at the same time prevent the invalid stroke in the booster.

Further, in the neck 30 extending to the rear side of the power piston 6, the vacuum valve portion 32 of the power piston 6 and the air valve portion 34 of the valve plunger 26 are opened and closed to open the power piston ( A rubber poppet 36 for activating 6) is installed to surround the input rod 28.

And a valve providing elasticity between the free end of the valve poppet 36 and the support jaw of the input rod 28 so that the valve poppet 36 may be in close contact with the vacuum and air valve parts 32 and 34. Return spring 38 is installed.

In the brake booster 2, the input rod 28 and the valve plunger 26 are pushed back by the rod return spring 38 as shown in FIG. 2 without pressing the brake pedal.

Then, the air valve portion 34 of the valve plunger 26 is brought into close contact with the tip of the valve poppet 36 and is closed, while the tip of the valve poppet 36 is pushed backward so that the vacuum valve portion 32 of the power piston 6 is closed. Will open.

Accordingly, the negative pressure generated in the intake manifold or the like is supplied to the front chamber 8 of the power cylinder 4 through the check valve 18 and through the negative pressure of the power piston 6 and the air flow path 20, 22. Also supplied to the rear chamber 10, the power piston 6 is pushed back by the return spring (14).

When the brake pedal is pressed for braking in such a state as described above, the input rod 28 moves forward, so that the valve poppet 36 and the valve plunger 26 move together, so that the tip of the valve poppet 36 moves to the power piston ( By closing the vacuum valve part 32 while being in close contact with the vacuum valve part 32 of 26, the negative pressure supply to the rear chamber 10 of the power cylinder 4 is interrupted | blocked.

Then, the air valve 34 of the valve plunger 26 is opened and released from the valve poppet 36 by the continuous movement of the input rod 28, so that the external atmosphere is opened to the neck 30 of the power piston 6. After being introduced, it is introduced into the rear chamber 10 of the power cylinder 4 through the air flow passage 22 of the power piston 6.

As a result, a large pressure difference is generated between the two chambers 8 and 10 of the power cylinder 14, that is, both sides of the power piston 6, and the pressure piston 6 moves toward the front chamber 8 by this pressure difference. As a result, the push rod 16 of the master cylinder MC is pressed to generate a high hydraulic pressure in the master cylinder MC while braking is performed.

In the brake booster 2 configured and operated as described above, the present invention provides a high pressure to supply a high pressure air to the rear side of the neck 30 of the power piston 6 so that the back force is increased by a large pressure difference during braking. The air supply means was arranged.

The high pressure air supply means comprises a reservoir 50, an air tank 52, and a heating tank 54, and the reservoir 50 is disposed at the rear side of the neck 30 of the power piston 6, The reservoir 50 thereof is connected to an air tank 52 that stores air of a predetermined high pressure.

In addition, the air tank 52 is attached to the exhaust manifold 54 has a configuration connected to the heating tank 56 for heating the air.

Accordingly, when the air filled in the heating tank 56 is heated by the heat of the exhaust manifold 54 to send the air tank 52, the air in the air tank 52 passes through the reservoir 50 when braking. It is supplied to the chamber (10).

In the heating tank 54, a check valve 58 for inlet air and a discharge check valve 60 for discharging the heated air to the air tank 54 are disposed. When the pressure is lower than the atmospheric pressure, the atmospheric inflow check valve 58 is opened to allow the outside atmosphere to flow in. When the temperature in the heating tank 56 is heated by the operation of the engine, the pressure increases and the discharge check valve 60 is opened. Opening and sending the heated air to the air tank (52).

In addition, the air tank 52 has a check valve 62 for adjusting the pressure is arranged to open when the pressure in the air tank 52 rises above the prescribed value to discharge the high-pressure air.

A solenoid valve 68 controlled by an ECU (engine control unit) 66 is disposed on a conduit 64 connecting the air tank 52 and the reservoir 50, and the ECU 66 brakes when braking. When the operation signal of the brake pedal is received from the operation switch 70, the solenoid valve 68 is controlled to open so that the high pressure air in the air tank 52 can be introduced into the existing atmospheric pressure filling part.

As described above, when the foot brake pedal for braking is operated, constant high pressure air is introduced into the rear chamber 10 of the brake booster 2, thereby minimizing a change in brake performance.

In addition, a large pressure difference is generated by the negative pressure and the high pressure air, thereby improving the brake performance by increasing the brake operation power.

In the figure, reference numeral 72 is an air filter for purifying high-pressure air flowing into the atmosphere filling unit, and 74 is a silencer for reducing noise.

As described above, according to the present invention, the response speed is increased when the brake is operated, and the brake performance can be improved by constantly and actively providing the pressure difference between the intake negative pressure and the atmospheric pressure for the driver's safety.

Claims (4)

A power piston connected to the push rod of the master cylinder and axially movable inside the power cylinder, a diaphragm installed on an outer circumference of the power piston and partitioning the inside of the power cylinder into a front chamber and a rear chamber; In a brake booster of an automobile having a valve plunger coupled to a power piston coaxially with a push rod, a key for preventing the valve plunger from escaping and an invalid stroke in a booster, and an input rod connecting the valve plunger to a brake pedal. , Automobile brake, characterized in that by connecting the high pressure air supply means for supplying the high pressure air pressurized by the heat of the exhaust manifold during operation of the brake pedal to the neck rear side of the wave cylinder for supplying atmospheric pressure to the rear chamber Booster boosting device. The air pressure supply means of claim 1, further comprising: a reservoir disposed at the neck rear atmospheric inlet of the power cylinder; An air tank configured to supply high pressure air to the reservoir by opening and closing the solenoid valve controlled by the ECU according to the operation of the brake pedal while storing heated air at a predetermined pressure or less; And a heating tank attached to the exhaust manifold to generate air of high pressure by heating the air by the exhaust heat. The apparatus of claim 2, wherein the air tank has a check valve for discharging air when the internal pressure is higher than a predetermined pressure. The air tank according to claim 2, wherein the heating tank has an air inlet check valve for introducing external atmospheric pressure when the internal pressure is below atmospheric pressure, and a discharge check valve for sending heated air to the air tank when the internal pressure is higher than the reference value. The boosting device of the automobile brake booster, characterized in that the arrangement.

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