KR20080086651A - Master cylinder for brake system - Google Patents

Master cylinder for brake system Download PDF

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Publication number
KR20080086651A
KR20080086651A KR1020070028599A KR20070028599A KR20080086651A KR 20080086651 A KR20080086651 A KR 20080086651A KR 1020070028599 A KR1020070028599 A KR 1020070028599A KR 20070028599 A KR20070028599 A KR 20070028599A KR 20080086651 A KR20080086651 A KR 20080086651A
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KR
South Korea
Prior art keywords
pressure
hydraulic chamber
hydraulic
piston
master cylinder
Prior art date
Application number
KR1020070028599A
Other languages
Korean (ko)
Inventor
이규만
Original Assignee
주식회사 만도
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 주식회사 만도 filed Critical 주식회사 만도
Priority to KR1020070028599A priority Critical patent/KR20080086651A/en
Publication of KR20080086651A publication Critical patent/KR20080086651A/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T11/00—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant
    • B60T11/10—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant transmitting by fluid means, e.g. hydraulic
    • B60T11/16—Master control, e.g. master cylinders
    • B60T11/20—Tandem, side-by-side, or other multiple master cylinder units
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T11/00—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant
    • B60T11/10—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant transmitting by fluid means, e.g. hydraulic
    • B60T11/16—Master control, e.g. master cylinders
    • B60T11/224—Master control, e.g. master cylinders with pressure-varying means, e.g. with two stage operation provided by use of different piston diameters including continuous variation from one diameter to another
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T11/00—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant
    • B60T11/10—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant transmitting by fluid means, e.g. hydraulic
    • B60T11/16—Master control, e.g. master cylinders
    • B60T11/236—Piston sealing arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D65/00—Parts or details
    • F16D65/14—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position
    • F16D65/16—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position arranged in or on the brake

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  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Transmission Of Braking Force In Braking Systems (AREA)

Abstract

A master cylinder for a brake system is provided to minimize the pressure difference between a first liquid chamber and a second liquid chamber by maintaining the pressure in both chambers equilibrium. A master cylinder for a brake system comprises a cylinder body(20) having a bore(21) formed therein, first and second pistons(23,24) installed at the inside of the bore of the cylinder body to move back and forth, respectively, and first and second liquid chambers(31,32) formed in the bore and partitioned with each other. A pressure adjusting oil path(60) connects the first liquid chamber with the second liquid chamber so that the pressure difference between the first and second liquid chamber reduces. An adjusting piston(63) is installed at the pressure adjusting oil path to move back and forth according to the pressure difference of the second liquid chamber.

Description

Master Cylinder for Brake System

1 is a cross-sectional view of a master cylinder for a conventional brake system.

2 is a cross-sectional view of a master cylinder for a brake system according to the present invention.

3 is a detailed view of portion A of FIG. 2.

Explanation of symbols on the main parts of the drawings

20: cylinder body 21: bore

23: first piston 24: second piston

31: first hydraulic chamber 32: second hydraulic chamber

33: 1st oil discharge hole 34: 2nd oil discharge hole

53: first oil inlet 54: second oil inlet

55, 56: communication hole 60: pressure regulating passage

63: adjustment piston

The present invention relates to a master cylinder for a brake system, and more particularly to a master cylinder for a brake system to minimize the pressure difference between the first hydraulic chamber and the second hydraulic chamber.

In the hydraulic brake system of the vehicle, the master cylinder generates hydraulic pressure and sends it to the wheel cylinder of each wheel.

Figure 1 shows a typical tandem master cylinder. The master cylinder has a first piston 3 and a second piston 4 provided in the bore 2 of the cylinder body 1 so as to be able to move forward and backward, respectively, and the inside of the bore 2 has a second piston 4. ), The first hydraulic chamber 5 and the second hydraulic chamber 6 are partitioned. In this master cylinder, when the first piston 3 moves forward, the first piston 3 pressurizes the oil in the first hydraulic chamber 5, and the oil pressure in the first hydraulic chamber 5 is the second piston 4. Pressurize. The second piston 4 pressurizes the oil in the second hydraulic chamber 6. Therefore, the oil of the first hydraulic chamber 5 is supplied to the wheel cylinder (not shown) of the wheel through the first oil discharge hole 7, and the oil of the second hydraulic chamber 6 is the second oil discharge hole 8. ) Is supplied to the wheel cylinder (not shown) of the other wheel. This is to ensure the safety of the driver by forming a braking pressure in the other hydraulic chamber even if a problem occurs in any one of the hydraulic chamber during the braking process.

Such a tandem master cylinder should theoretically have the same pressure in the first hydraulic chamber 5 and the second hydraulic chamber 6, but in many cases it is not. That is, in a situation where braking is performed, a pressure difference between two hydraulic chambers 5 and 6 may be generated temporarily. However, this pressure difference may cause the vehicle braking because it causes a difference in braking force on each wheel side.

The present invention is to solve such a problem, it is an object of the present invention to provide a master cylinder for a brake system to minimize the pressure difference between the first hydraulic chamber and the second hydraulic chamber.

The master cylinder for a brake system according to the present invention for achieving the above object is provided with a cylinder body having a bore formed therein, first and second pistons installed to advance and retreat within the bore, and arranged to be mutually partitioned inside the bore. A first and second hydraulic pressure chambers pressurized by first and second pistons, respectively, and connecting the first hydraulic pressure chamber and the second hydraulic pressure chamber to reduce a pressure difference between the first hydraulic pressure chamber and the second hydraulic pressure chamber. And a control piston provided in the pressure regulating passage so as to retreat according to the pressure difference between the first hydraulic chamber and the second hydraulic chamber.

In addition, the pressure control passage is characterized in that formed in the cylinder body.

In another aspect, the present invention is characterized in that it further comprises a sealing member installed on the outer surface of the control piston for sealing between the pressure control oil inner surface and the control piston outer surface.

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

As illustrated in FIG. 2, the master cylinder for the brake system according to the present invention is installed in the cylinder body 20 having the bore 21 formed therein and in the bore 21 of the cylinder body 20 so as to be able to move forward and backward, respectively. The first piston 23 and the second piston 24 are provided.

First and second sealing members 25 and 26 are installed between the inner surface of the bore 21 and the outer surface of the first piston 23, and between the inner surface of the bore 21 and the outer surface of the second piston 24. The third and fourth sealing members 27 and 28 are respectively installed therein. Each sealing member 25, 26, 27, 28 is accommodated in the support grooves 29 formed on the inner surface of the bore 21 so as not to move even when the piston (23, 24) is advancing. Therefore, the inner space of the bore 21 is formed between the first hydraulic chamber 31 between the first piston 23 and the second piston 24 and the inner surface of the distal end of the second piston 24 and the bore 21. It is divided into two hydraulic chambers 32.

The cylinder body 20 has oil in the first and second hydraulic chambers 31 and 32 when the first and second hydraulic chambers 31 and 32 are pressurized by the first and second pistons 23 and 24. A first oil discharge hole 33 is formed in the first hydraulic pressure chamber 31 side, and a second oil discharge hole 34 is formed in the second hydraulic pressure chamber 32 side so as to be discharged. Therefore, when the first piston 23 moves forward, the first piston 23 pressurizes the first hydraulic chamber 31, and the pressure in the first hydraulic chamber 31 pressurizes the second piston 24 so that the second piston is moved. 24 may pressurize the second hydraulic chamber 32, wherein the oil in the first and second hydraulic chambers 31 and 32 is discharged to the first and second oil discharge holes 33 and 34, and the wheels It is supplied to the wheel cylinder (not shown) of the side.

In the first hydraulic chamber 31, a first restoration spring 35 for restoring the first piston 23 after the braking operation is completed, and the second piston 24 is also provided in the second hydraulic chamber 32. The second restoration spring 36 is installed to restore the pressure. In addition, spring receiving grooves 37 and 38 are formed in the first and second pistons 23 and 24 to allow the first and second restoration springs 35 and 36 to enter the respective interiors. In addition, the spring receiving groove 37 of the first piston 23 is provided with a rod-shaped support portion 41 extending forward from the inside thereof so that the retainer 39 supporting the first restoring spring 35 can be installed. . The support part 41 is provided with a snap ring 43 for preventing the retainer 39 from being separated. That is, one end of the first restoring spring 35 is supported inside the spring receiving groove 37 and the other end is supported by the flanged end 39a of the retainer 39. The retainer 39 is retractably fitted to the outer surface of the support part 41 and is prevented from being separated by the snap ring 43 fastened to the support part 41.

First and second oil inlet ports 51 and 52 connected to an oil tank (not shown) are provided at an upper portion of the cylinder body 20, and these oil inlet ports 51 and 52 may be provided to the first and second oil inlets. The oil inlets 53 and 54 communicate with the first and second hydraulic chambers 31 and 32, respectively. For this configuration, the first oil inlet 53 is formed between the first sealing member 25 and the second sealing member 26, and the second oil inlet 54 is the third sealing member 27 and the fourth sealing member. It is formed between the sealing member 28. In addition, the first and second pistons 23 and 24 have an outer surface such that oil flowing through the first and second oil inlets 53 and 54 can flow into the first and second hydraulic chambers 31 and 32. Communication holes 55 and 56 communicating with the outer surface and the spring receiving grooves 37 and 38 are formed.

The communication holes 55 and 56 are provided with the first and second oil inlets 53 and 54 and the first and second hydraulic chambers 31 and 32 with the first and second pistons 23 and 24 retracted. And the lower and rear portions of the second and fourth sealing members 26 and 28 so as to be in communication with each other. This allows oil to flow through the communicating holes 55 and 56 when the first and second pistons 23 and 24 retreat, and communicate holes 55 when the first and second pistons 23 and 24 advance. 56 moves forward out of the positions of the second and fourth sealing members 26 and 28 to block the flow of oil through the communication holes 55 and 56. Therefore, when the first and second pistons 23 and 24 retreat, oil may be replenished into the first and second hydraulic chambers 31 and 32, and the first and second pistons 23 and 24 move forward. In this case, the first and second hydraulic chambers 31 and 32 may be pressurized by the first and second pistons 23 and 24.

A pressure regulating passage 60 is formed in the lower portion of the cylinder body 20 to reduce the pressure difference between the first hydraulic chamber 31 and the second hydraulic chamber 32. As shown in FIG. 3, the pressure adjusting passage 60 bypasses the third and fourth sealing members 27 and 28 to connect the first hydraulic chamber 31 and the second hydraulic chamber 32. to be. This is because when the first hydraulic pressure chamber 31 is pressurized by the first piston 23, the pressure of the first hydraulic pressure chamber 31 is transferred to the second hydraulic pressure chamber 32 through the pressure adjusting passage 60. The pressure difference between the first hydraulic chamber 31 and the second hydraulic chamber 32 is to be reduced. The pressure adjusting flow path 60 is formed by drilling the cylinder body 20, and the part where the drill enters is closed by using stoppers 62.

In addition, an adjustment piston 63 is provided inside the pressure regulating passage 60 to advance and retreat according to the pressure difference between the first hydraulic pressure chamber 31 and the second hydraulic pressure chamber 32, and the pressure is provided on the outer surface of the adjustment piston 63. An O-ring sealing member 64 is installed to seal between the inner surface of the adjusting passage 60 and the adjusting piston 63. This can reduce the pressure difference between the two hydraulic chambers (31, 32) while the pressure difference between the first hydraulic chamber (31) and the second hydraulic chamber (32), the control piston (63) moves inside the pressure control passage (60). It would be. In addition, the inside of the pressure regulating passage 60 is partitioned by the adjusting piston 64 so as to prevent the phenomenon that the oil in the first hydraulic pressure chamber 31 continues to flow toward the second hydraulic pressure chamber 32. That is, when the pressure difference between the two hydraulic chambers (31, 32) occurs, the movement of the adjustment piston (63) is restricted after the adjustment piston (63) moves to a predetermined section to reduce the pressure difference. Therefore, even when a problem such as oil leakage occurs in one of the first and second hydraulic chambers 31 and 32, the braking pressure can be formed in the other hydraulic chamber.

3 shows a case where the pressure adjusting passage 60 is formed in the cylinder body 20, but is not limited thereto, and the pressure adjusting passage 60 may be implemented by installing a separate pipe or the like on the cylinder body. .

The following describes the overall operation of such a master cylinder.

When the first piston 23 is pressurized by the braking operation, the first piston 23 advances and presses the first hydraulic chamber 31. When the first hydraulic chamber 31 is pressurized, the second piston is driven by this pressure. Since 24 is pressurized and advanced, the 2nd hydraulic chamber 32 is pressurized. Therefore, the oil in the first and second hydraulic chambers 31 and 32 is supplied to the wheel cylinders (not shown) on the wheel side through the first and second oil discharge holes 33 and 34 so that braking can be performed.

If a pressure difference occurs between the first hydraulic chamber 31 and the second hydraulic chamber 32 during the braking operation, the two hydraulic pressures are moved while the adjustment piston 63 inside the pressure regulating passage 60 is moved by the pressure difference. Since the pressure balance of the chambers 31 and 32 is achieved, the pressure difference between the two hydraulic chambers 31 and 32 can be minimized.

When the braking operation is released, the first and second pistons 23 and 24 are pushed backward by the elasticity of the first and second restoration springs 35 and 36, so that the first and second pistons 23 and 24 ) Is restored to its original state.

As described in detail above, in the master cylinder for a brake system according to the present invention, if a pressure difference occurs between the first hydraulic chamber and the second hydraulic chamber, the pressure of the two hydraulic chambers is moved by moving the control piston inside the pressure regulating passage by this pressure difference. Since equilibrium is achieved, the pressure difference between the two hydraulic chambers can be minimized.

In addition, the present invention is limited to the movement range of the control piston inside the pressure control flow passage, and the inside of the pressure control flow passage is divided into the first hydraulic pressure chamber side and the second hydraulic pressure chamber side by the adjustment piston, whichever of the first and second hydraulic pressure chambers Even when a problem such as oil leakage occurs in the hydraulic chamber, there is an effect that the braking pressure can be generated in the other hydraulic chamber.

Claims (3)

First and second pressurized by a cylinder body having a bore formed therein, first and second pistons installed to retreat from inside the bore, and the first and second pistons provided to be partitioned inside the bore, respectively. In the master cylinder for a brake system including a hydraulic chamber, In order to reduce the pressure difference between the first hydraulic chamber and the second hydraulic chamber, a pressure regulating passage provided to connect the first hydraulic chamber and the second hydraulic chamber, and the pressure difference between the first hydraulic chamber and the second hydraulic chamber. The master cylinder for a brake system, characterized in that it comprises a control piston provided in the pressure control passage to advance. The method of claim 1, The pressure control passage is a master cylinder for a brake system, characterized in that formed in the cylinder body. The method according to claim 1 or 2, And a sealing member installed on an outer surface of the adjusting piston for sealing between the pressure adjusting oil passage inner surface and the adjusting piston outer surface.
KR1020070028599A 2007-03-23 2007-03-23 Master cylinder for brake system KR20080086651A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020070028599A KR20080086651A (en) 2007-03-23 2007-03-23 Master cylinder for brake system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020070028599A KR20080086651A (en) 2007-03-23 2007-03-23 Master cylinder for brake system

Publications (1)

Publication Number Publication Date
KR20080086651A true KR20080086651A (en) 2008-09-26

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ID=40025821

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020070028599A KR20080086651A (en) 2007-03-23 2007-03-23 Master cylinder for brake system

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101444956B1 (en) * 2008-12-04 2014-09-26 현대자동차주식회사 Brake Flow-Pressure Supply Device
US9266510B2 (en) 2012-04-30 2016-02-23 Mando Corporation Master cylinder for brake system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101444956B1 (en) * 2008-12-04 2014-09-26 현대자동차주식회사 Brake Flow-Pressure Supply Device
US9266510B2 (en) 2012-04-30 2016-02-23 Mando Corporation Master cylinder for brake system

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A201 Request for examination
E601 Decision to refuse application