KR20030006157A - Reservoir In Hydraulic Brake System - Google Patents

Abstract

PURPOSE: A reservoir of a hydraulic brake system is provided to make possible the entrance of oil between a master cylinder and the reservoir by improving the structure of the reservoir and an oil guide pipe combined to an oil inlet port of the master cylinder and to prevent the displacement of a cylinder pin fixed in the cylinder even without a washer. CONSTITUTION: A reservoir is combined to each oil inlet ports(28) at an upper portion of a master cylinder. Cylindrical oil guide pipes are formed in the lower end of the reservoir. Since the oil guide pipes are connected to the oil inlet ports, the reservoir is combined with the master cylinder. A first oil guide pipe is fully opened to make the end portion of a first oil inlet port is the same as the inner diameter of a first oil guide pipe. A second oil guide pipe(72) is partially opened. The part except an opening(80) of the second oil guide pipe is closed with closing sections(90). Thus, oil flows through the end portion of the second oil guide pipe, and the displacement of a cylinder pin(60) fixed in a cylinder is prevented.

Description

Reservoir In Hydraulic Brake System

The present invention relates to a reservoir that stores oil forming hydraulic pressure in a vehicle hydraulic brake system and is coupled to a master cylinder, and more particularly, is formed in the reservoir to distribute oil between the reservoir and the master cylinder. It relates to the structure of the oil guide tube.

In general, a vehicle hydraulic brake system is a device for generating a braking force by transmitting the hydraulic pressure generated by pressing the brake pedal to the hydraulic brake side installed on the front wheel and the rear wheel, respectively. The hydraulic brake system is provided with a master cylinder for operating hydraulic pressure to the brake cylinder and the hydraulic power storage device for forming the hydraulic pressure, and the hydraulic cylinder to transfer the hydraulic pressure to the wheel cylinder side.

As shown in FIG. 1, a general master cylinder installed at the front of the power supply apparatus is provided with a cylindrical cylinder 1 having one end blocked and spaced apart from each other in the cylinder 1 so as to allow mutual movement. The first piston 2a and the second piston 2b are provided. At this time, the space between the first piston 2a and the second piston 2b and the space between the closed end of the second piston 2b and the cylinder 1 are respectively the first outflow space 3a and the second outflow. A space 3b is formed, and each of the outlet spaces 3a and 3b is provided with a return spring 4 for returning the pistons 2a and 2b when the braking action is released. In addition, the cylinder 1 of the upper and lower wheels are pressurized oil from the first oil inlet port 5a, the second oil inlet port 5b and the outlet spaces 3a and 3b for supplying oil into the master cylinder. A first oil outlet port 6a and a second oil outlet port 6b, which are delivered to the cylinder (not shown) side, are respectively formed. The master cylinder is coupled to the master cylinder, and the oil guide pipe 7a provided in the reservoir 7 is fitted with the sealing member 7b to the oil inlet ports 5a and 5b of the master cylinder. The cylinder and reservoir 7 are combined.

On the other hand, in the middle portion of the second piston (2b) inlet space (3b ') is stored before the oil flowed into the cylinder (1) through the second oil inlet port (5b) is sent to the second outlet space (3b) ) Is installed, and a connection flow path 8 for communicating the inflow space 3b 'and the second outflow space 3b is formed at the tip end of the second piston 2b. The connection passage 8 has a center valve 9 which is in charge of supplying oil to the second outflow space 3b, and the center valve 9 penetrates through the second piston 2b to form a center valve 9. It is operated by being spaced apart or in contact with the cylinder pin (1a) fixed to the rear cylinder (1) of. More specifically, the center valve 9 includes an opening and closing member 9a and an operating pin 9b respectively provided at the front end and the end thereof, and the support member 9c provided at the front of the opening and closing member 9a and opening and closing. A support spring 9d is provided between the members 9a. When the braking action is released, the actuating pin 9b of the center valve 9 is supported by the cylinder pin 1a so that the opening / closing member 9a is supported. The spring 9d is pressed and moved to the front side. As a result, a fine gap is formed between the center valve 9 and the connection flow path 8, and the oil in the inflow space 3b ′ is supplied to the second outflow space 3b through the gap. On the contrary, during the braking operation, the second piston 2b is advanced so that the cylinder pin 1a and the operating pin 9b are spaced apart, the center valve 9 is moved to the rear side by the support spring 9d, and the center valve 9 Opening and closing member 9a of) will block the flow of oil flowing to the connection flow path (8). Therefore, the oil supply from the inflow space 3b ?? to the second outflow space 3b through the connecting flow passage 8 is stopped, and the second outflow space 3b is subsequently moved forward of the second piston 2b. The oil inside is pressurized and discharged to a wheel cylinder (not shown).

As such, the cylinder pin 1a which opens and closes the connection flow path 8 together with the center valve 9 is often provided to be fixed to the cylinder 1 below the second oil inlet port 5b. The oil guide pipe 7a of the reservoir 7 coupled to the inlet port 5b is provided in a cylindrical shape with a hollow inside, as shown in FIG. 2. Accordingly, when a shock or vibration of the vehicle is applied to the cylinder pin 1a, the cylinder pin 1a may be separated from the cylinder 1 to the reservoir 7 through the oil guide tube 7a. In this case, the cylinder pin 1a can no longer support the center valve 9.

In order to solve this problem, conventionally, as shown in Figure 3, the separation of the cylinder pin (1a) between the second oil inlet port (5b) of the master cylinder and the oil guide pipe (7a) of the reservoir (7) A method of interposing a washer (1b) for preventing this is used. However, in the case of using the washer (1b), as well as the assembly process is lengthened accordingly, there is a problem that the cost increases due to the production of the washer (1b).

The present invention is to solve the above problems, an object of the present invention is to improve the structure of the oil guide pipe of the reservoir coupled to the oil inlet port of the master cylinder in the hydraulic brake system between the master cylinder and the reservoir; It is to provide a reservoir of the hydraulic brake system that enables the oil entering and exit, as well as to prevent the release of the cylinder pin fixed inside the cylinder below the oil inlet port without a washer.

1 is a cross-sectional view showing a coupling structure of a conventional master cylinder and a reservoir.

FIG. 2 is a cross-sectional view taken from the arrow direction after cutting of FIG. 1 by cutting line II-II. FIG.

Figure 3 is an enlarged cross-sectional view showing a coupling structure of the improved conventional master cylinder and the reservoir.

Figure 4 is a cross-sectional view showing a coupling structure of the master cylinder and the reservoir according to the present invention.

FIG. 5 is a cross-sectional view taken along the line III-III of FIG. 4 and seen from the arrow direction.

FIG. 6 is a cross-sectional view taken from the arrow line III-III of FIG. 4 and shows another embodiment of the present invention.

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

28: 2nd oil inlet port 60: cylinder pin

72: second oil guiding tube 73: sealing member

80: opening 90: closing

The present invention for achieving the above object is a connection passage formed in the front end of the piston so that the piston is installed in the cylinder, the inlet space formed in the piston and the outlet space formed in front of the piston communicate with the connection, A center valve installed on a flow path and fixed to the cylinder behind the center valve through the piston, and before the braking action, the connection flow path is opened by contacting the center valve and spaced apart from the center valve during the braking action. A master cylinder having a cylinder pin for closing a flow path, an oil inlet port provided at an upper end of the cylinder pin, and a communication hole provided in a cylinder in which the oil inlet port is formed to communicate the oil inlet port and the inflow space;

In the hydraulic brake system including a reservoir (reservoir) having an oil guide pipe coupled with the oil inlet port to enable the oil inlet and outflow into the master cylinder,

One end of the oil guide tube opposite the cylinder pin is formed with an opening formed by a slit to enable oil flow between the reservoir and the master cylinder, and a closing part which catches the cylinder pin by blocking a portion other than the slit. Characterized in that provided.

And the width of the opening is characterized in that formed smaller than the diameter of the cylinder pin.

In addition, when the width of the opening is larger than the diameter of the cylinder pin, the opening is characterized in that it is provided eccentrically from the center of the oil guide pipe.

In addition, the closure is characterized in that the oil guide tube and the reservoir (reservoir) are provided with the same material.

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

The hydraulic brake system to which the reservoir according to the present invention is applied is a device for braking the wheel by transferring the hydraulic pressure generated inside the master cylinder to the wheel cylinder side according to the action of the output shaft of the booster. It comprises a reservoir for storing and storing oil.

As shown in FIG. 4, the dual master cylinder includes a cylindrical cylinder 10 having an empty inside and a closed end, and having a first piston 21 and a second piston 22 inside the cylinder 10. ) Are spaced apart so that mutual movement is possible. At this time, the space between the first piston 21 and the second piston 22 forms the first outflow space 23, and the space between the second piston 22 and the closed end of the cylinder 10 is the second space. The outlet space 24 is formed, and each outlet space 23 and 24 is provided with a return spring 25 for returning each piston 21 and 22 when the braking action is released. In addition, an inflow space 26 through which oil flows from the reservoir 30 is provided in the middle portion of the second piston 22.

The first oil inlet port 27 and the second oil inlet port 28 for distributing oil between the reservoir 30 and the master cylinder while simultaneously coupling the reservoir 30 to the master cylinder at the upper portion of the cylinder 10. And a first oil outlet port 29a communicating with the first outlet space 23 and a second oil outlet port 29b communicating with the second outlet space 24 are provided below the cylinder 10. The oil pressurized by the operation of the pistons 21 and 22 can flow to the wheel cylinder (not shown) through these oil outlet ports 29a and 29b. In addition, the first communication hole 31 and the first communication hole communicating between the first outlet space 23 and the first oil inlet port 27 are connected to the cylinder 10 at the portion where the first oil inlet port 27 is installed. A second communication hole 32 is provided to allow the oil inlet port 27 to communicate with a space between the outer circumference of the first piston 21 and the inner circumference of the cylinder 10. In addition, a third communication hole 33 is provided in the cylinder 10 at the portion where the second oil inlet port 28 is installed so that the second oil inlet port 28 communicates with the inflow space 26.

In addition, a center valve 40 is provided in the front end of the second piston 22 to open and close oil flow from the inflow space 26 to the second outflow space 24, and the center valve 40 has a front end. It is provided with an opening and closing member 41 and the operation pin 42 provided at the end and the body portion 43 between the opening and closing member 41 and the operation pin 42, and the opening and closing member 41 and the center valve 40 A support spring 45 is installed between the support members 44 provided at the front side. In addition, the front end portion of the second piston 22 is provided with a connection flow path 50 formed by a step so as to accommodate the center valve 40, the connection flow path 50 is the first opening and closing member 41 is received; A first flow path 51 and a second flow path 52 in which the body portion 43 is accommodated and a third flow path 53 in which the operation pin 42 is installed are provided.

A cylinder pin 60 fixed to the cylinder 10 through the inflow space 26 of the second piston 22 is installed at the rear of the connection flow path 50, and the cylinder pin 60 has a center valve when the braking action is released. The support pin 42 of the 40 is supported. With the support of the cylinder pin 60, the center valve 40 is moved forward on the connecting flow path 50 so that the opening and closing member 41 presses the front support spring 45, thereby opening and closing the member 41 and the second. The flow path 52 is spaced apart so that the flow of oil through the connection flow path 50 is opened. In the braking operation, the center valve 40 moves forward together with the second piston 22. In this case, the cylinder pin 60 and the operation pin 42 are spaced apart and the elastic action of the support spring 45 is prevented. As a result, the center valve 40 is pushed to the rear side in the connection passage 50. Then, the flow of oil through the connection channel 50 is closed by the opening and closing member 41 blocking the second channel 52. The flow of oil through the connection passage 50 is blocked, and the oil in the second outflow space 24 is pressurized by the advance of the second piston 22 to be continued and transferred to the wheel cylinder (not shown).

On the other hand, each of the oil inlet port (27,28) of the upper portion of the master cylinder is coupled to the reservoir (reservoir) 30 for storing and storing the oil forming the hydraulic pressure. To this end, the lower end of the reservoir 30 has a cylindrical oil guide tube (71, 72) is formed in a pair extending to the master cylinder side, which is coupled to the first oil inlet port (27) A second oil guide tube 72 is coupled to the tube 71 and the second oil inlet port 28. Each oil guide pipe (71, 72) is coupled to each oil inlet port (27, 28), the reservoir 30 and the master cylinder is coupled. A sealing member 73 for sealing the inner oil is interposed between the oil guide pipes 71 and 72 and the oil inlet ports 27 and 28.

The oil guide pipes 71 and 72 allow the oil in the reservoir 30 and the master cylinder to flow through the oil inlet ports 27 and 28, and in the case of the first oil guide pipe 71, the first oil. The end part of the inlet port 27 side is completely opened so that it may be equal to the inner diameter of the 1st oil guide tube 71. However, as shown in FIG. 5, in the case of the second oil guide pipe 72, an end portion of the second oil inlet port 28 is not completely opened, but an opening part 80 provided as a slit formed in a radial direction. ) And only the portion other than the opening 80 is blocked by the closure (90).

Therefore, the end of the second oil guide tube 72 consisting of the opening portion 80 and the closing portion 90 enables the flow of oil, as well as the cylinder 10 in which the second oil inlet port 28 is located. It is to prevent the separation of the cylinder pin 60 is fixed to). In more detail, as described above, the cylinder pin 60 penetrates through the second piston 22 and is fixed to the cylinder 10 at the lower end of the second oil inlet port 28, thereby releasing the center valve ( It is installed to support the operation pin 42 of the 40, the cylinder pin 60 is the second oil inlet port 28 and the second oil when the cylinder pin 60 is shocked from the outside or the vibration of the vehicle. There is a fear that the inside of the reservoir 30 through the guide tube (72). However, even if the cylinder pin 60 is separated into the second oil inlet port 28, the cylinder pin 60 is provided with a closure 90 at one end of the second oil guide tube 72 facing the cylinder pin 60. 60 is not allowed to enter into the second oil guide tube (72). In addition, an opening 80 provided as a slit is formed between the closing parts 90 so that oil between the reservoir 30 and the master cylinder is circulated through the opening 80. At this time, the closing portion 90 is formed of a material of the same material as the reservoir 30 and the oil guide pipe (71, 72), the opening portion 80 is the radial direction of the second oil guide pipe (72) It is preferably formed so that the width is smaller than the diameter of the cylinder pin (60) so that the cylinder pin (60) more securely to the closing portion (90).

In addition, a retainer 23a and one end supporting the return spring 25 and one end of the first outlet space 23 are coupled to a distal end of the first piston 21, and the other end thereof is movable to the retainer 23a. Guide rods 23b to be coupled are installed.

Next, the operation of the hydraulic brake system to which the reservoir according to the present invention is applied will be described.

First, before stepping on the brake pedal (not shown), the oil stored in the reservoir 30 is introduced into the first oil inlet port 27 through the end of the first oil guide pipe 71 and the second oil guide. It is introduced into the second oil inlet port 28 through the opening 80 formed at the end of the tube 72. The oil delivered to the first oil inlet port 27 is supplied to the outer circumference of the first outlet space 23 and the first piston 21 through the first communication hole 31 and the second communication hole 32, respectively. The oil supplied to the second oil inlet port 28 is sent to the inflow space 26 through the third communication hole 33 and then transferred to the second outflow space 24 through the connection flow path 50. When the driver steps on the brake pedal (not shown) and the output shaft (not shown) of the power booster (not shown) pushes the first piston 21 of the master cylinder, the first piston 21 and the second piston 22 In relative motion, the pistons 21 and 22 pressurize the return spring 25 and move forward of the cylinder 10. At this time, the first communication hole 31 is blocked by the advancement of the first piston 21, the first outlet space 23 is compressed, the cylinder pin 60 and the center valve (by the advance of the second piston 22) The operation pins 42 of 40 are spaced apart and the flow of oil through the connection passage 50 is closed to compress the second outlet space 24. The oil compressed in each of the outlet spaces 23 and 24 is delivered to the wheel cylinders (not shown) of the hydraulic brake through the oil outlet ports 29a and 29b to brake the wheels (not shown). In addition, when the power output device (not shown) according to the braking action is released, the pistons 21 and 22 are moved to their original positions by the extension of the return springs 25. In this case, the return of the first piston 21 is performed. Due to this, the first communication hole 31 is opened again, and the operation pin 42 of the center valve 40 is supported by the cylinder pin 60 again by the return of the second piston 22, thereby connecting the flow path ( The flow of oil through 50 is opened. And even if the cylinder pin 60 is released from the position into the second oil inlet port 28 due to the vibration generated during shock or braking from the outside, the end of the second oil guide tube 72 is closed The unit 90 is provided to prevent the cylinder pin 60 from being separated into the reservoir 30 through the second oil guide tube 72.

6 illustrates another embodiment according to the present invention as a case in which the width of the opening 81 provided as the slit is larger than the diameter of the cylinder pin 60. As shown in FIG. 6, in the present embodiment, the opening 81 is provided to be eccentric from the center of the second oil guide tube 72. Therefore, even when the diameter of the cylinder pin 60 is larger than the width of the opening 81, the cylinder pin 60 is caught by the closing portion 91.

As described above in detail, the reservoir of the hydraulic brake system according to the present invention is provided with an opening formed by a slit at the end of the oil guide tube and a closing portion formed to block a portion other than the opening, thereby providing the reservoir and the master cylinder. The oil flow between the liver is possible, as well as preventing the cylinder pin from being separated through the oil guide tube without using a separate member.

Claims (4)

A connection flow path formed at the front end of the piston so that a piston installed inside the cylinder, an inflow space formed in the piston, and an outflow space formed in front of the piston, and a center valve installed on the connection flow path; A cylinder pin penetrating the piston and fixed to the cylinder behind the center valve and contacting the center valve to open the connection flow path before the braking action and spaced apart from the center valve to close the connection flow path during the braking action; A master cylinder having an oil inlet port provided at an upper end of the pin, and a communication hole provided in a cylinder in which the oil inlet port is formed to communicate the oil inlet port with the inflow space; In the hydraulic brake system including a reservoir (reservoir) having an oil guide pipe coupled with the oil inlet port to enable the oil inlet and outflow into the master cylinder, One end of the oil guide tube opposite the cylinder pin is formed with an opening formed by a slit to enable oil flow between the reservoir and the master cylinder, and a closing part which catches the cylinder pin by blocking a portion other than the slit. Reservoir of the hydraulic brake system, characterized in that provided. The method of claim 1, Reservoir of the hydraulic brake system, characterized in that the width of the opening is formed smaller than the diameter of the cylinder pin. The method of claim 1, Reservoir of the hydraulic brake system, characterized in that the opening is eccentrically provided from the center of the oil guide pipe when the width of the opening is larger than the diameter of the cylinder pin. The method of claim 1, The closure is a reservoir (reservoir) of the hydraulic brake system, characterized in that provided with the same material as the oil guide tube and the reservoir (reservoir).