KR20000009946A - Vacuum connecting pipe fixing device of break booster for vehicle - Google Patents

Abstract

PURPOSE: A device is provided to always keep the vacuum in a constant pressure chamber by preventing the movement of a vacuum connecting pipe in a state of finishing assembling. CONSTITUTION: The device is installed with:a casing(10) closed and combined with a front and a rear cells(11, 12); a diaphragm(40) and a power piston(41) for dividing the inner part of the casing into the constant pressure chamber and a transformer chamber(30); a vacuum connecting pipe(60) that one end part(61) is inserted into a combining hole(13) formed on the front cell for keeping the constant pressure chamber in a vacuum state and the other end part(62) is combined with a vacuum hose(80) of an engine absorbing unit; an outer flange unit(63) formed integrally on the one end part of the vacuum connecting pipe.

Description

Vacuum connection pipe fixing device for vehicle brake booster

The present invention relates to a vehicle brake power booster, and more particularly, to a vacuum connection pipe fixing device of a power booster for communicating a vacuum hose of an engine suction unit and a power booster constant pressure chamber.

BOOSTER of a vehicle brake is a device that generates a large braking force with a small force by using a pressure difference between the vacuum and the atmosphere. The power booster having such a function is composed of a casing consisting of a front cell and a rear cell, an input shaft interlocked by a brake pedal, an output shaft receiving displacement force according to the operation of the input shaft, and the like.

The inside of the casing is divided into a constant pressure chamber and a transformer chamber by a diaphragm and a power piston, which communicate with each other through a constant pressure passage formed in the valve body described later. One outer wall of the pressure chamber is combined with a vacuum connection pipe that communicates with the engine intake. The restoring spring is installed inside the pressure chamber so that the diaphragm and power piston are moved by the elastic restoring force when the power unit is not in operation. It is kept in the backward position.

And the valve body for controlling the intake of air is coupled to the casing, which is fixed to the diaphragm and the power piston, the other end is formed in the air intake port is projected outward from the rear end of the casing is in communication with the atmosphere, Link together according to the movement.

The power boosting device for a vehicle brake configured as described above has a constant pressure chamber and a transformer chamber in a vacuum state by an engine suction unit at an initial state. When the driver presses the brake pedal, the input shaft is advanced and external air flows into the transformer chamber through the valve body. At this time, the external air is instantaneously introduced by the differential pressure, and the operable diaphragm and the power piston are pushed toward the constant pressure chamber, so that the output amplified from the input is transmitted to the master cylinder assembly through the output shaft to generate the braking hydraulic pressure.

When the foot is released from the brake pedal, the input shaft is restored by the elastic restoring force of the restoring spring and the power piston. In addition, the transformer chamber air is discharged into the vacuum pressure chamber through the positive pressure passage, and the air of the pressure chamber exits the vacuum connection pipe and the vacuum hose, and the constant pressure chamber is in a vacuum state, which is the initial state of the brake power supply.

Therefore, the constant pressure chamber must be constantly maintained in a vacuum state so that the power supply apparatus can perform this function. A vacuum connection pipe connected to the vacuum hose is provided in the casing so that the air in the constant pressure chamber is discharged by the intake force of the engine. That is, the vacuum connection pipe functions to communicate the vacuum hose inside the positive pressure chamber, the detailed structure of which is as shown in FIG.

The vacuum connection pipe 3 is composed of an elbow type bent 90 degrees, one end (3a) is coupled to the casing (1) of the power unit using a sealing member (4), the other end is vacuum It is connected to the end of the hose (5). Both ends of the vacuum connection pipe 3 are provided with a plurality of escape stops 3c on the outer circumferential surface, respectively, to maintain a state in which the sealing member 4 and the vacuum hose 5 are coupled.

Accordingly, the sealing member 4 made of a rubber material is forcibly coupled to the coupling hole 1a formed in the casing 1, and then one end 3a of the vacuum connection pipe 3 is inserted into the sealing member 4 center. Accordingly, since the one end portion 3a of the vacuum connection pipe 3 is pressed while the sealing member 4 is compressed, the positive pressure chamber 2 is kept airtight with the outside. The other end 3b of the vacuum connection pipe 3 is coupled to the vacuum hose 5 in a state where the power supply device is mounted on the vehicle.

Therefore, during operation of the engine (not shown), the constant pressure chamber 2 air is discharged to the outside by the engine suction unit (not shown), the vacuum hose 5 and the vacuum connection pipe 3, so that the constant pressure chamber 2 is always vacuumed. Stays in the state.

However, the conventional vacuum connection pipe 3 is hermetically maintained in a stationary state because its one end 3a is forcibly coupled to the sealing member 4 made of rubber, but the vacuum connection pipe 3 is twisted instead of its original position. If it is placed in the position there is a possibility that the outside air flows into the positive pressure chamber (2) to lose the degree of vacuum occurs.

That is, the end of the vacuum hose 5 connected to the engine suction part (not shown) is connected to the other end 3b of the vacuum connection pipe 3, and vibration generated during engine operation is transmitted to the vacuum connection pipe 3. Sometimes this can shake. In addition, when the vacuum connection pipe 3 also vibrates or rotates due to the external force applied to the vacuum hose 5 during the vibration and shaking of the other components or maintenance work, it is placed in the wrong position from the original installation position.

If such a change in the position of the vacuum connection pipe 3 occurs frequently, a gap is formed between the sealing member 4 and the coupling hole 1a and between the outer peripheral surface of one end 3a of the vacuum connection pipe 3 and the sealing member 4. In this case, external air is directly introduced into the positive pressure chamber 2 through such a gap, so that it is difficult to maintain the vacuum degree of the positive pressure chamber 2, and in some cases, the vacuum degree is lost. In addition, when a fluid such as oil flows into the gap between the sealing member 4 and the one end 3a of the vacuum connection pipe 3, the risk of the distortion of the vacuum connection pipe 3 is increased.

The present invention is to solve this problem, an object of the present invention is to connect the vacuum connection pipe to the casing front cell by using a sealing member to communicate the vacuum hose and the power supply pressure chamber, one end is coupled to the vacuum connection pipe The other end is provided with a fixing member fixed to the adjacent part, and after the coupling of the vacuum connection pipe is completed, even if the vibration due to the external force or the engine driving is transmitted to the vacuum connection pipe to prevent its rotation and twisting to improve the reliability of the power unit. It is to provide a vacuum connection pipe fixing device of a vehicle brake power booster.

1 is a cross-sectional view showing a fastening structure of a conventional vacuum connection pipe.

2 is a cross-sectional view of a vehicle power booster equipped with a vacuum connection pipe according to the present invention.

3 is an exploded perspective view showing a vacuum connection pipe fixing structure according to the present invention.

Figure 4 is a perspective view showing a vacuum connection pipe fixing member according to another embodiment of the present invention.

* Description of the symbols for the main parts of the drawings *

11..Front Cell 13..Combination Hole 20.

60. Vacuum connection pipe 63. Outward flange part 65. First connection part

70. Sealing member 90. Fixed member 93. Engagement groove

94..Section 2 95..Retained groove

In order to achieve the above object, the present invention provides a casing in which a front cell and a rear cell are hermetically coupled to each other. A rubber material which is fitted into a coupling hole formed in the coupling hole and the other end is pressed between the vacuum connection pipe coupled to the end of the vacuum hose of the engine suction part and between the coupling hole and one end of the vacuum connection pipe to seal between the coupling hole and one end of the vacuum connection pipe. In the boosting device for a vehicle brake having an outward flange portion integrally formed at one end of the sealing member and the vacuum connection pipe and in contact with the rear end of the sealing member exposed to the outside,

A coupling groove is formed at one end so as to be fitted to the outer peripheral surface of the vacuum connection pipe, and a fixing groove fixed to an adjacent part is provided at the other end to provide a plate-like fixing member for preventing the movement of the vacuum connection pipe.

Hereinafter, one preferred embodiment according to the present invention will be described in detail with reference to the accompanying drawings. Figure 2 is a cross-sectional view of the brake power supply device for a vehicle equipped with a vacuum connection pipe according to the present invention, Figure 3 is an exploded perspective view of the vacuum connection pipe fixing member according to the present invention.

In the brake booster according to the present invention, as shown in the figure, the inside of the casing 10 in which the front cell 11 and the rear cell 12 are hermetically coupled is fixed by the power piston 41 and the diaphragm 40. It is divided into a chamber 20 and a transformer chamber 30, the valve body 50 for controlling the air flow path to the transformer chamber 30 and the constant pressure chamber 20, the input shaft 53 for operating the valve body 50 It is largely composed of an output shaft (54) receiving a doubled force. The valve body 50 is provided with a constant pressure passage 52 for communicating the constant pressure chamber 20 and the transformer chamber 30, and a transformer passage 51 for communicating the outside air and the transformer chamber 30. One outer wall of the front cell 11 is coupled to the vacuum connection pipe 60 for communicating the positive pressure chamber 20 and the engine suction part (not shown), and the diaphragm 40 and the power inside the positive pressure chamber 20. A restoring spring 21 for restoring the piston 41 and the valve body 50 to its original position is provided.

The vacuum connection pipe 60 is made of an elbow type bent 90 degrees, one end 61 is in communication with the positive pressure chamber 20, the other end 62 is a vacuum hose 80 connected to the engine inlet (not shown) The ends are joined, the detailed structure of which is as follows.

First, a circular coupling hole 13 is drilled in the front cell 11 of the casing 10 constituting the positive pressure chamber 20, and a sealing member 70 made of rubber material is coupled thereto. The sealing member 70 has a fastening groove 71 recessed in the circumferential direction on the outer circumferential surface thereof and has a hollow central portion. One end 61 of the vacuum connection pipe 60 is forcibly coupled to the hollow portion of the sealing member 70 to communicate with the positive pressure chamber 20, and the other end 62 is fitted with the end of the vacuum hose 80. , An anti-separation jaw 64 is provided on the outer circumferential surfaces of both ends 61 and 62 to prevent the detached state from being coupled.

One end portion 61 of the vacuum connection pipe 60 is integrally provided with an outward flange portion 63 which is in surface contact with the rear end portion 72 of the sealing member 70. The outer peripheral surface of the upper portion is a characteristic element of the present invention. One end 91 of the fixing member 90 is prevented from being moved by an external force while the furnace vacuum connection pipe 60 is assembled. The plate-shaped fixing member 90 has one end 91 fitted into the one end 61 of the vacuum connection pipe 60 and the other end 92 is fixed to an adjacent part, whereby the coupling of the vacuum connection pipe 60 is completed. Its rotation and distortion are prevented at

One end 91 of the fixing member 90 is fitted into and fixed to an outer circumferential surface of one end 61 of the vacuum connection pipe 60. For this purpose, one end 61 and the fixing member 90 of the vacuum connection pipe 60 are fixed. The first fastening portion 65 and the second fastening portion 94 are formed at one end 91, respectively.

The first fastening portion 65 is formed on the outer circumferential surface of one end 61 of the vacuum connection pipe 60, which is a configuration in which the teeth protrude continuously in the axial direction. That is, the outer circumferential surface of one end 61 of the vacuum pipe 60 is initially formed in a regular polygon shape so as to be suitable for injection molding, which is a manufacturing process of the vacuum connection pipe 60, and a regular polygon in order to improve foreign matter adhesion and rotational resistance. By forming each side of the concave side, the serrated first fastening portion 65 is formed.

One end portion 91 of the fixing member 90 is formed with a semicircular coupling groove 93 having one side open so that the vacuum connection pipe 60 is fitted into one side portion, and the other end 92 and the bolt are fixed to the other end 92. The fixing groove 95 is formed. The second fastening portion 94 is formed on the circumferential surface of the coupling groove 93, which is a configuration in which teeth are continuously formed corresponding to the first coupling portion 65, and the first coupling portion 65 is coupled to the coupling groove 93. When combined to insert the first fastening portion 65 and the second fastening portion 94 is bite. At this time, it is preferable to configure the opening of the coupling groove 93 and the fixing groove 95 in the form of a type of "S" shaped clamp, which is pre-assembled the fixing member 90 through the fixing groove 95 If it is rotated about this after the coupling between the coupling groove 93 and the first fastening portion 65 is easy.

Next, the assembly process of the vacuum connection pipe 60 and the fixing member 90 configured as described above will be described. First, the sealing member 70 is forcibly inserted until the fastening groove 71 is inserted into the front cell 11 coupling hole 13, and then the one end 61 of the vacuum connection pipe 60 is sealed with the sealing member 70. Insert into the hollow part of). Since the sealing member 70 is made of a rubber material, one end 61 of the vacuum connection pipe 60 is inserted while pressing the sealing member 70. At this time, when the one end 61 of the vacuum connection pipe 60 is pushed in until the outward flange portion 63 and the rear end 72 of the sealing member 70 come into contact with each other, one end of the vacuum connection pipe 60 Between the 61 and the coupling hole 13, the sealing member 70 is sandwiched between the positive pressure chamber 20 and the outside air.

Then, the fixing member 90 is fastened to prevent the vacuum connection pipe 60 from moving. First, fixing bolts of adjacent parts (not shown) through the fixing groove 95 of the other end 92 of the fixing member 90. Assemble loosely. Subsequently, after adjusting the vacuum connecting pipe 60 to a desired angle, the fixing member 90 is rotated to fix the fixing member 90 through the first fastening portion 65 and the coupling groove 93 of the vacuum connecting pipe 60. One end 91 is fixed. That is, the first fastening portion 65 and the second fastening portion 94 of the coupling groove 93 are bitten off. When the fixing bolt (not shown) is completely tightened in this state, the first fastening member 90 The second connection part 94 and the first connection part 65 of the vacuum connection pipe 60 prevent the vacuum connection pipe 60 from moving without artificial force.

At this time, when the fixing bolt is coupled to the other end of the fixing member 90, the fixing member 90 is also rotated by the rotation moment thereof so that the close contact between the first fastening portion 65 and the second fastening portion 94 is reduced. Is increased. In addition, the fixing groove 95 of the other end 92 of the fixing member 90 is preferably inserted into a bolt (not shown) to fix the flange portion (not shown) of the master cylinder (not shown) and fastened at the same time.

Next, the operation and effects of the vehicle power booster configured as described above will be described.

First, when the driver presses the brake pedal while the vehicle is running, the input shaft 53 moves forward and at the same time, the outside air flows into the transformer chamber 30 in a vacuum state through the transformer passage 51 of the valve body 50. do. The diaphragm 40 and the power piston 41 which are operable by this differential pressure are pushed toward the positive pressure chamber 20 side, and the output shaft 54 advances the piston of the master cylinder with the force amplified from the input to generate braking hydraulic pressure. Let's do it. When the driver releases the brake pedal, the air in the transformer chamber 30 is discharged into the vacuum pressure chamber 20 in the vacuum state through the positive pressure passage 52, and the engine suction unit (not shown) always drives the constant pressure chamber. (20) The air is brought into a vacuum state through the vacuum connection pipe 60 and the vacuum hose 80 to be the initial state of the brake booster.

Therefore, the positive pressure chamber 20 must always be maintained in a vacuum state so that the power supply device can perform this function smoothly. The vacuum connection pipe 60 to which the end of the vacuum hose 80 is coupled is the front cell 11 of the power supply device. It is firmly bound to the air inlet phenomenon.

That is, since the vacuum connecting pipe 60 is firmly fixed by using the fixing member 90 having the second fastening portion 94 formed to be separated from the first fastening portion 65, the external force is completed when the coupling is completed. It does not rotate or twist even when vibration of other parts is transmitted. Therefore, the initial coupled state is maintained as it is, the gap does not occur between the sealing member 70 and the one end portion 61 of the vacuum connection pipe 60.

On the other hand, the technical idea is not limited to this, and the first and second fastening portions are not jagged, but also composed of a polygonal surface, of course, can achieve the desired purpose according to the present invention, of course, in FIG. As shown in the figure, by forming the bent portion 910 on the center of the fixing member 900, the fixing groove 910 and the second fastening portion 920 can be easily fixed to the adjacent parts and the vacuum connection pipe.

As described in detail above, the vacuum connection pipe fixing device of the vehicle brake power booster according to the present invention is a vacuum connection pipe is coupled to the casing front cell by using a sealing member to communicate the vacuum hose and the pressure booster constant pressure chamber, It is coupled to the vacuum connection pipe and the other end is fixed to the adjacent part is provided with a fixing member to prevent the movement of the vacuum connection pipe.

Therefore, after the assembly of the vacuum connection pipe is completed, even if vibration caused by external force or engine driving is transmitted, the stationary member is completely sealed between the sealing member and one end of the vacuum connection pipe without being moved by the fixing member, so that the positive pressure chamber vacuum degree is maintained accurately. The overall reliability of is improved.

Claims (2)

A casing 10 formed by sealing the front cell 11 and the rear cell 12, and a diaphragm 40 and a power piston that divide the casing 10 into a positive pressure chamber 20 and a transformer chamber 30. 41, one end 61 is fitted into the coupling hole 13 formed in the front cell 11 to maintain the positive pressure chamber 20 in a vacuum state, and the other end 62 is vacuumed from the engine suction part. A vacuum connection pipe 60 coupled to an end of the hose 80, and is interposed between the coupling hole 13 and one end 61 of the vacuum connection pipe 60, and the coupling hole 13 and the vacuum connection pipe. (60) of the sealing member 70 of a rubber material for sealing between one end portion 61, the sealing member 70 formed integrally with the one end portion 61 of the vacuum connection pipe 60 and exposed to the outside In the vehicle brake power supply apparatus having an outward flange portion 63 in contact with the rear end portion 72, A coupling groove 93 is formed at one end 91 so that the vacuum connection pipe 60 is inserted into and coupled to the outer circumferential surface thereof, and a fixing groove 95 fixed to an adjacent part is provided at the other end 92 of the vacuum connection pipe 60. A vacuum connection pipe fixing device for a brake power booster for a vehicle, characterized in that it comprises a plate-like fixing member (90) to prevent movement of the vehicle. The outer peripheral surface of one end portion 61 of the vacuum connection pipe 60 is provided with a first fastening portion 65 in which teeth are continuously projected in the axial direction. One side portion of the coupling groove 93 of the fixing member 90 is opened to insert the vacuum connection pipe 60, and the first coupling portion 65 is separated from the circumferential surface of the coupling groove 93. The toothed second fastening part (94) is provided to prevent rotation of the vacuum connection pipe (60) is a vacuum connection pipe fixing device for a vehicle brake power booster.