KR200285911Y1 - Vacuum connection pipe fixing structure of vehicle brake power booster - Google Patents

Abstract

The present invention relates to a vacuum connection pipe fixing structure of a vehicle brake power booster, the purpose is to prevent the movement of the vacuum connection pipe in the state of assembly is completed to always maintain the vacuum in the constant pressure chamber.

The vacuum connection pipe fixing structure of the vehicle brake power booster according to the present invention uses the sealing member 70 to communicate the vacuum hose 80 and the power booster constant pressure chamber 20 to the front cell 11 of the casing 10. The vacuum connection pipe 60 is coupled. When the vacuum connection pipe 60 is coupled, one end portion of the vacuum connection pipe 60 is wrapped around the end portion 61 of the vacuum connection pipe 60 and the other end is fixed to the plate-like fixing member 90. Rotation and twisting of the vacuum connection pipe 60 are prevented.

Therefore, after the assembly of the vacuum connection pipe 60 is completed, the sealing member 70 and one end 61 of the sealing member 70 and the vacuum connection pipe 60 are not moved by the fixing member 90 even when vibration due to external force or engine driving is transmitted. Since the sealing is completely sealed and the vacuum of the positive pressure chamber 20 is accurately maintained, the overall reliability of the power supply apparatus is improved.

Description

Vacuum connection pipe fixing structure of vehicle brake power booster

The present invention relates to a vehicle brake power booster, and more particularly to a vacuum connection pipe fixing structure of the power booster for communicating the vacuum hose of the engine suction portion and the 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 air in the transformer chamber is discharged into the vacuum pressure chamber through the positive pressure passage, and the air in the pressure chamber exits the vacuum connection pipe and the vacuum hose, and the pressure chamber becomes a vacuum state and becomes the initial state of the brake booster.

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. Therefore, since the sealing member 4 is pressed, the one end portion 3a of the vacuum connection pipe 3 is forcibly fitted, so that 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.

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. Is kept in a 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, the 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 unit constant pressure chamber, one end of the fixing member made of a plate Brake force for vehicle that improves the reliability of the power supply device by combining one end of the vacuum connection pipe and fixing the other end to an adjacent part, thereby preventing rotation and twisting of the vacuum connection pipe even when vibration caused by external force or engine driving is transmitted. It is to provide a vacuum connection pipe fixing structure of the device.

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

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

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

4 is a plan view of the fixing member according to the present invention.

5 is a perspective view of a 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 .. Static pressure chamber

60. Vacuum connection pipe 63. Outward flange 70. Sealing member

71. Fastening groove 80. Vacuum hose 90. Fixed member

91. Holder part 92.

The present invention for achieving this purpose, the front cell and the rear cell is a casing, the diaphragm, the power piston, the constant pressure chamber for partitioning the inside of the casing into the positive pressure chamber and the transformer chamber, the one end is the front cell A rubber material which is inserted into a coupling hole formed in the coupling hole and the other end is compressed between the vacuum connection pipe coupled to the vacuum hose end of the engine suction part and between one end of the coupling hole and 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,

One end is coupled to surround the central portion of the vacuum connection pipe, and the other end is fixed to the adjacent component is characterized in that it comprises a plate-like fixing member to prevent the movement in the combined state 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, Figures 3 and 4 are an exploded perspective view showing a vacuum connection pipe fixing structure 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 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 72 of the sealing member 70. As a characteristic element of the present invention, the vacuum connection pipe ( 60) The fixing member 90 is provided to prevent movement by the external force in the assembled state.

The plate-shaped fixing member 90 has one end wrapped around the one end 61 of the vacuum connection pipe 60 and the other end is fixed to the adjacent part, so that the rotation and the rotation thereof in the state where the coupling of the vacuum connection pipe 60 is completed. Distortion is prevented. The fixing member 90 is bent so as to surround one end 61 of the vacuum connection pipe 60 and fixed using the bolt 93 and the nut 94. That is, the fixing member 90 is largely composed of a holder portion 91 coupled to the one end portion 61 of the vacuum connection pipe 60 and a fixing portion 92 fixed to adjacent parts. The holder 91 is wrapped around the vacuum connecting pipe 60 and fixed using a bolt 93 and a nut 94. To this end, bolt holes 91a and 91b are formed at ends and corresponding centers, respectively. . A bolt hole 92a is also formed at the end of the fixing part 92, which is for fastening the bolt 95 to be fixed to an adjacent component.

Therefore, the sealing member 70 is forcibly inserted until the fastening groove 71 is inserted into the front cell 11 coupling hole 13, and then one end 61 of the vacuum connection pipe 60 is sealed with the sealing member 70. Insert into the hollow of the 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.

The fastening member 90 is fastened to prevent the vacuum connection pipe 60 from moving. First, the holder 90 is bent to surround the outer circumferential surface of one end portion 61 of the vacuum connection pipe 60. Let's do it. Since the holder portion 91 has a slight elastic force, the holder portion 91 is not detached from the plastic deformation state so as to enclose it, and the bolt 93 and the nut 94 are loosely fastened through the bolt holes 91a and 91b. Subsequently, the fixing member 90 is securely fastened to the flange portion (not shown) of the master cylinder (not shown) or another part adjacent to the bolt 95 through the bolt hole 92a. At this time, since the fixing member 90 is formed in a plate shape extending a predetermined length, it is possible to fix while fixing the fixing part 92 according to the position of the fixing part. When the bolt 93 is loosely tightened in this state, the holder 93 of the vacuum connection pipe 60 one end 61 and the fixing member 90 are pressed by the pressing force of the holder 91. As the 91 is fixed, the vacuum connection pipe 60 is not twisted or shaken by an external force. Then, after mounting the power supply device coupled to the vacuum connection pipe 60 to the vehicle, assembling the end of the vacuum hose 80 to the other end 62 of the vacuum connection pipe 60, the assembly of the power supply device is completed.

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 connection pipe 60 is firmly fixed by using the fixing member 90 formed of the holder portion 91 and the fixing portion 92, the vibration of the external force or other parts is transmitted in the state where the coupling is completed. It does not rotate or twist. 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, this technical idea is not limited to this, as shown in Figure 5 constitutes a holder portion 910 of the "U" shaped to prevent the rotation of the vacuum connection pipe at one end of the fixing member 900, and the other end Even if the fixing bolt hole 920 is formed, it is of course possible to achieve the desired purpose according to the present invention. At this time, bolt holes 911 and 912 are drilled at both ends of the holder portion 910 having a “U” shape. Therefore, while the one end of the vacuum connection pipe is inserted into the sealing member, both ends of the holder portion 910 are bent to surround the one end of the vacuum connection pipe, and the bolt and nut are loosely tightened. Then, after firmly fixing to the adjacent parts through the other end bolt hole 920 of the fixing member 900, when the bolt and the nut is completely tightened to the holder part 910, artificial force is applied by the pressing force of the holder part 910. Without application, the vacuum connection pipe is prevented from twisting or rotating.

As described in detail above, the vacuum connection pipe fixing structure 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 power supply pressure chamber, vacuum When connecting the connection pipe, one end is wrapped around the one end of the vacuum connection pipe, and the other end is prevented from rotating and twisting the vacuum connection pipe by using a plate-like fixing member coupled to an adjacent part.

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, One end is coupled to surround the center of the vacuum connection pipe 60 and the other end is fixed to an adjacent part is provided with a plate-like fixing member 90 to prevent movement in the combined state of the vacuum connection pipe 60 The vacuum connection pipe fixing structure of the vehicle brake power boosting device characterized in that. The holder member 91 of claim 1, wherein the fixing member 90 is bent to surround one end 61 of the vacuum connection pipe 60 and is fixed using the bolt 93 and the nut 94. And a fixing part (92) having a bolt hole (92a) perforated to fasten the bolt (95) to an adjacent part of the vacuum connection pipe fixing structure of the brake power supply for a vehicle.