KR20080086650A - Master cylinder for brake system - Google Patents

Master cylinder for brake system Download PDF

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Publication number
KR20080086650A
KR20080086650A KR1020070028598A KR20070028598A KR20080086650A KR 20080086650 A KR20080086650 A KR 20080086650A KR 1020070028598 A KR1020070028598 A KR 1020070028598A KR 20070028598 A KR20070028598 A KR 20070028598A KR 20080086650 A KR20080086650 A KR 20080086650A
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KR
South Korea
Prior art keywords
oil
bore
piston
sealing member
master cylinder
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KR1020070028598A
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Korean (ko)
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KR101134900B1 (en
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이규만
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주식회사 만도
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Priority to KR1020070028598A priority Critical patent/KR101134900B1/en
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    • 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 allow oil to smoothly be introduced from an oil tank to a liquid chamber. A master cylinder for a brake system comprises a cylinder body(20) having a bore(21) formed therein, first and second pistons(24) installed at the inside of the bore of the cylinder body to move back and forth, respectively, and a plurality of sealing member. The bore is provided at an inner surface thereof with a gap(61) spaced apart from the piston to form an oil path(62) between an inner surface of the bore and an outer surface of the piston. The oil path has a cross section, which is larger than that of an oil inlet port. The bore includes support grooves(29) formed at the inner surface of the bore to support the sealing member. The support groove is formed with a support ring(63) to prevent the sealing member from being escaped.

Description

브레이크시스템용 마스터실린더{Master Cylinder for Brake System}Master Cylinder for Brake System

도 1은 종래 브레이크시스템용 마스터실린더의 단면도이다.1 is a cross-sectional view of a master cylinder for a conventional brake system.

도 2는 도 1의 A부 상세도이다.FIG. 2 is a detailed view of portion A of FIG. 1.

도 3은 본 발명에 따른 브레이크시스템용 마스터실린더의 단면도이다.3 is a cross-sectional view of a master cylinder for a brake system according to the present invention.

도 4는 도 3의 B부 상세도이다.4 is a detailed view of portion B of FIG. 3.

도 5는 본 발명에 따른 브레이크시스템용 마스터실린더의 실링부재를 지지하는 지지링의 구성을 나타낸 평면도이다.5 is a plan view showing a configuration of a support ring for supporting a sealing member of a master cylinder for a brake system according to the present invention.

* 도면의 주요 부분에 대한 부호의 설명 *Explanation of symbols on the main parts of the drawings

20: 실린더본체 21: 보어20: cylinder body 21: bore

23: 제1피스톤 24: 제2피스톤23: first piston 24: second piston

31: 제1액압실 32: 제2액압실31: first hydraulic chamber 32: second hydraulic chamber

33: 제1오일배출공 34: 제2오일배출공33: 1st oil discharge hole 34: 2nd oil discharge hole

53: 제1오일유입구 54: 제2오일유입구53: first oil inlet 54: second oil inlet

55,56: 연통공 61: 이격부55,56: Communication hole 61: Spacer

62: 오일유로 63: 지지링62: oil path 63: support ring

64: 오일유통홈64: Oil Distribution Home

본 발명은 브레이크시스템용 마스터실린더에 관한 것으로, 더욱 상세하게는 오일탱크의 오일이 액압실 쪽으로 원활히 유입될 수 있도록 한 브레이크시스템용 마스터실린더에 관한 것이다.The present invention relates to a master cylinder for a brake system, and more particularly, to a master cylinder for a brake system to allow the oil in the oil tank to smoothly flow into the hydraulic chamber.

차량의 유압식 브레이크시스템에서 마스터실린더는 유압을 발생시켜서 각 바퀴의 휠 실린더로 보내주는 장치이다. In the hydraulic brake system of the vehicle, the master cylinder generates hydraulic pressure and sends it to the wheel cylinder of each wheel.

도 1은 통상적인 텐덤형 마스터실린더를 나타낸 것이다. 이 마스터실린더는 실린더본체(1)의 보어(2) 내부에 각각 진퇴 가능하게 설치된 제1피스톤(3)과 제2피스톤(4)을 구비하고, 보어(2)의 내부는 제2피스톤(4)에 의해 제1액압실(5)과 제2액압실(6)로 구획된다. 또 제1피스톤(4) 외측의 보어(2) 내면에는 상호 이격된 위치에 제1실링부재(7)와 제2실링부재(8)가 각각 설치되고, 제2피스톤(4) 외측의 보어(2) 내면에는 역시 상호 이격된 위치에 제3실링부재(9)와 제4실링부재(10)가 각각 설치된다. 각 실링부재들(7,8,9,10)은 보어(2)의 내면에 형성된 지지홈(11)에 결합된다.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 addition, the first sealing member 7 and the second sealing member 8 are respectively provided at positions spaced apart from each other on the inner surface of the bore 2 outside the first piston 4, and the bore outside the second piston 4 is provided. 2) The third sealing member 9 and the fourth sealing member 10 are respectively installed at positions spaced apart from each other. Each sealing member 7, 8, 9, 10 is coupled to a support groove 11 formed in the inner surface of the bore 2.

제1피스톤(3)과 제2피스톤(4)에는 피스톤들이 후퇴한 상태에서 오일탱크(미도시) 쪽과 연계된 제1 및 제2오일유입구(12,13)를 통하여 각 액압실(5,6) 쪽으로 오일이 유입될 수 있도록 둘레를 따라 다수의 연통공들(14,15)이 형성된다. 이 연통공들(14,15)은 제1 및 제2피스톤(3,4)이 전진할 때 제2 및 제4실링부재(8,10) 앞쪽으로 이동함으로써 제1 및 제2액압실(5,6)이 가압될 수 있도록 하고, 제1 및 제2 피스톤(3,4)이 후퇴할 때 제2 및 제4실링부재(8,10) 후방으로 이동하여 제1 및 제2오일유입구(12,13)와 연통됨으로써 제1 및 제2액압실(5,6) 쪽으로 오일이 유입될 수 있도록 한다.The first piston 3 and the second piston 4 each of the hydraulic chambers 5, through the first and second oil inlet (12, 13) associated with the oil tank (not shown) in the state that the piston is retracted A plurality of communication holes 14 and 15 are formed along the circumference so that oil can flow into 6). These communicating holes 14 and 15 move to the front of the second and fourth sealing members 8 and 10 when the first and second pistons 3 and 4 move forward, so that the first and second hydraulic chambers 5 6 to be pressurized, and when the first and second pistons 3 and 4 retreat, they move to the rear of the second and fourth sealing members 8 and 10 so that the first and second oil inlets 12 By communicating with (13), the oil can be introduced into the first and second hydraulic chamber (5,6).

각 실링부재들(7,8,9,10)은 도 2에 도시한 바와 같이, 피스톤의 외면에 밀착되는 밀폐부(10a)와, 이 밀폐부(10a)를 지지하는 지지부(10b)를 포함하는 형태이다. 그리고 보어(2)의 내면에는 각 실링부재(7,8,9,10)의 지지부(10a)를 지지할 수 있도록 피스톤들(3,4)의 외면에 근접하는 걸림턱들(17)이 형성된다. 이는 피스톤들(3,4)이 진퇴하더라도 각 실링부재들(7,8,9,10)이 지지홈(11)으로부터 이탈하지 않도록 한 것이다. 따라서 제1 및 제2오일유입구(12,13)로부터 각 액압실(5,6) 쪽으로 흐르는 오일은 걸림턱들(17)과 피스톤들(3,4) 외면 사이의 좁은 틈(18)을 통하여 연통공(14,15)으로 흐른다.As shown in FIG. 2, each of the sealing members 7, 8, 9, and 10 includes a sealing part 10a in close contact with the outer surface of the piston, and a supporting part 10b supporting the sealing part 10a. It is a form. And the inner surface of the bore (2) is formed with locking projections 17 close to the outer surface of the piston (3, 4) to support the support portion (10a) of each sealing member (7, 8, 9, 10) do. This prevents the sealing members 7, 8, 9, and 10 from escaping from the support groove 11 even when the pistons 3 and 4 move forward and backward. Accordingly, the oil flowing from the first and second oil inlets 12 and 13 toward the hydraulic chambers 5 and 6 passes through the narrow gap 18 between the locking jaws 17 and the outer surface of the pistons 3 and 4. Flow into communication holes (14, 15).

그러나 이러한 마스터실린더는 걸림턱들(17)과 피스톤들(3,4) 외면 사이의 틈(18)이 좁기 때문에 오일탱크(미도시) 쪽으로부터 각 액압실(5,6) 쪽으로의 오일공급이 원활하지 않을 수 있었다.However, such a master cylinder has a narrow gap 18 between the engaging jaws 17 and the outer surfaces of the pistons 3 and 4 so that the oil supply from the oil tank (not shown) to the hydraulic chambers 5 and 6 is prevented. Could not be smooth.

본 발명은 이와 같은 문제점을 해결하기 위한 것으로, 본 발명의 목적은 오일탱크 쪽으로부터 액압실 쪽으로 오일의 공급이 원활히 이루어질 수 있도록 하는 브레이크시스템용 마스터실린더를 제공하는 것이다.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 for the smooth supply of oil from the oil tank side to the hydraulic chamber.

이러한 목적을 달성하기 위한 본 발명에 따른 브레이크시스템용 마스터실린 더는 내부에 보어가 형성된 실린더본체와, 상기 보어 내부의 액압실을 가압하기 위해 상기 보어 내부에 진퇴 가능하게 설치된 적어도 하나의 피스톤과, 상기 피스톤과 상기 보어 내면 사이의 밀폐를 위해 상기 보어 내면의 상호 이격된 위치에 설치된 복수의 실링부재와, 상기 실링부재의 설치를 위헤 상기 보어의 내면에 형성된 지지홈과, 상기 액압실로 오일을 공급할 수 있도록 상기 복수의 실링부재 사이의 상기 실린더본체에 형성된 오일유입구와, 상기 피스톤이 후퇴한 상태에서 상기 오일유입구와 상기 액압실이 연통될 수 있도록 상기 피스톤에 형성된 연통공을 포함하며, 상기 오일유입구와 상기 지지홈 사이의 상기 보어 내면에는 상기 보어내면과 상기 피스톤 외면 사이에 상기 오일유입구의 단면적보다 큰 오일유로가 형성될 수 있도록 상기 피스톤으로부터 이격된 이격부가 마련되고, 상기 지지홈에는 상기 실링부재가 상기 이격부 쪽으로 이탈하는 것을 방지하기 위해 상기 실링부재를 지지하는 지지링이 설치된 것을 특징으로 한다.The master cylinder for a brake system according to the present invention for achieving the above object is a cylinder body with a bore formed therein, at least one piston removably installed in the bore to pressurize the hydraulic chamber inside the bore, A plurality of sealing members installed at mutually spaced positions of the inner surface of the bore for sealing between the piston and the inner surface of the bore, support grooves formed on the inner surface of the bore for installation of the sealing member, and oil to be supplied to the hydraulic chamber. An oil inlet formed in the cylinder body between the plurality of sealing members so as to be able to communicate with the oil inlet and the hydraulic chamber in a state in which the piston is retracted; An inner surface of the bore between the bore and the support groove; Thus, a spaced portion spaced apart from the piston is provided so that an oil passage larger than a cross-sectional area of the oil inlet is formed, and the support groove supports the sealing member to prevent the sealing member from being separated toward the spaced portion. A ring is installed.

또한 상기 지지링은 내주연 쪽에 형성된 다수의 오일유통홈을 포함하는 것을 특징으로 한다.In addition, the support ring is characterized in that it comprises a plurality of oil distribution groove formed on the inner peripheral side.

이하에서는 본 발명에 따른 바람직한 실시 예를 첨부 도면을 참조하여 상세히 설명한다. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

본 발명에 따른 브레이크시스템용 마스터실린더는 도 2에 도시한 바와 같이, 내부에 보어(21)가 형성된 실린더본체(20)와, 실린더본체(20)의 보어(21) 내부에 각각 진퇴 가능하게 설치된 제1피스톤(23)과 제2피스톤(24)을 구비한다. 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.

보어(21)의 내면과 제1피스톤(23)의 외면 사이에는 제1 및 제2실링부 재(25,26)가 각각 설치되고, 보어(21)의 내면과 제2피스톤(24)의 외면 사이에는 제3 및 제4실링부재(27,28)가 각각 설치된다. 각 실링부재(25,26,27,28)는 각 피스톤(23,24)이 진퇴하는 경우에도 움직이지 않도록 보어(21)의 내면에 형성된 지지홈들(29)에 수용된다. 따라서 보어(21)의 내부공간은 제1피스톤(23)과 제2피스톤(24) 사이의 제1액압실(31)과, 제2피스톤(24)과 보어(21)의 말단 내면 사이의 제2액압실(32)로 구획된다. First and second sealing member materials 25 and 26 are provided between the inner surface of the bore 21 and the outer surface of the first piston 23, respectively, and 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 therebetween. 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.

실린더본체(20)에는 제1 및 제2피스톤(23,24)에 의해 제1 및 제2액압실(31,32)이 가압될 때 제1 및 제2액압실(31,32)의 오일이 배출될 수 있도록 제1액압실(31) 쪽에 제1오일배출공(33)이 형성되고, 제2액압실(32) 쪽에 제2오일배출공(34)이 형성된다. 따라서 제1피스톤(23)이 전진하면 제1피스톤(23)이 제1액압실(31)을 가압하고, 제1액압실(31)의 압력이 제2피스톤(24)을 가압하여 제2피스톤(24)이 제2액압실(32)을 가압할 수 있는데, 이때 제1 및 제2액압실(31,32)의 오일은 제1 및 제2오일배출공(33,34)으로 배출되어 바퀴 측의 휠 실린더(미도시)로 공급된다.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.

제1액압실(31) 내에는 제동동작 종료 후 제1피스톤(23)을 복원시키기 위한 제1복원스프링(35)이 설치되고, 제2액압실(32) 내에는 역시 제2피스톤(24)을 복원시키기 위한 제2복원스프링(36)이 설치된다. 그리고 제1 및 제2피스톤(23,24)에는 제1 및 제2복원스프링(35,36)이 각각의 내부로 진입할 수 있도록 전방에 스프링수용홈들(37,38)이 형성된다. 또 제1피스톤(23)의 스프링수용홈(37)에는 제1복원스프링(35)을 지지하는 리테이너(39)를 설치할 수 있도록 그 내부로부터 전방으로 연장 된 봉 형태의 지지부(41)가 마련된다. 지지부(41)에는 리테이너(39)의 이탈방지를 위한 스냅링(43)이 설치된다. 즉 제1복원스프링(35)은 일단이 스프링수용홈(37)의 내부에 지지되고 타단이 리테이너(39)의 플렌지형 단부(39a)에 지지된다. 리테이너(39)는 지지부(41)의 외면에 진퇴 가능하게 끼워지며, 지지부(41)에 체결되는 스냅링(43)에 의하여 이탈이 방지된다.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. The first and second pistons 23 and 24 are formed with spring receiving grooves 37 and 38 at the front thereof 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 as to install a retainer 39 for supporting the first restoration spring 35. . 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.

실린더본체(20)의 상부에는 오일탱크(미도시)와 연결되는 제1 및 제2오일유입포트(51,52)가 마련되고, 이들 오일유입포트들(51,52)은 제1 및 제2오일유입구(53,54)를 통하여 제1 및 제2액압실(31,32)과 각각 연통된다. 이러한 구성을 위해 제1오일유입구(53)는 제1실링부재(25)와 제2실링부재(26) 사이에 형성되고, 제2오일유입구(54)는 제3실링부재(27)와 제4실링부재(28) 사이에 형성된다. 그리고 제1 및 제2피스톤(23,24)에는 제1 및 제2오일유입구(53,54)를 통하여 유입되는 오일이 제1 및 제2액압실(31,32)로 유입될 수 있도록 외면에 그 외면과 스프링수용홈들(37,38)이 연연통하는 연통공들(55,56)이 형성된다.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.

연통공들(55,56)은 제1 및 제2피스톤(23,24)이 후퇴한 상태에서 제1 및 제2오일유입구가 제1 및 제2액압실(31)과 각각 연통될 수 있도록 제2 및 제4실링부재(26,28)의 하부 또는 그 후방에 위치하도록 형성된다. 이러한 구성은 제1 및 제2피스톤(23,24)이 후퇴하면 연통공들(55,56)을 통하여 오일이 유통되도록 하고, 제1 및 제2피스톤(23,24)이 전진하면 연통공들(55,56)이 제2 및 제4실링부재(26,28)의 위치를 벗어나 전방으로 이동함으로써 연통공들(55,56)을 통한 오일의 유동이 차단되도록 한 것이다. 따라서 제1 및 제2피스톤(23,24)이 후퇴한 경우에는 제1 및 제2 액압실(31,32)로 오일이 보충될 수 있고, 제1 및 제2피스톤(23,24)이 전진할 때는 제1 및 제2액압실(31,32)이 제1 및 제2피스톤(23,24)에 의해 가압될 수 있다.The communication holes 55 and 56 are formed so that the first and second oil inlets communicate with the first and second hydraulic chambers 31 while the first and second pistons 23 and 24 are retracted, respectively. It is formed to be located below or behind the second and fourth sealing members (26, 28). This configuration allows oil to flow through the communication holes 55 and 56 when the first and second pistons 23 and 24 retreat, and communicate holes when the first and second pistons 23 and 24 move forward. The movement of the oil through the communication holes 55 and 56 is blocked by moving 55 and 56 forwards out of the positions of the second and fourth sealing members 26 and 28. 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.

제1 및 제2오일유입구(53,54)와 제2 및 제4실링부재(26,28)를 수용하는 지지홈들(29) 사이의 보어(21) 내면에는 도 3 및 도 4에 도시한 바와 같이, 보어 내면과 피스톤들(23,24) 외면 사이에 제1 또는 제2오일유입구(53,54)의 단면적보다 큰 오일유로(62)가 형성될 수 있도록 피스톤들(23,24)로부터 이격되는 이격부(61)가 마련된다. 이는 제1 및 제2오일유입구(53,54)로부터 각 피스톤(23,24)의 연통공(55,56) 쪽으로 오일이 원활히 흐를 수 있도록 함으로써 오일탱크(미도시)로부터 제1 및 제2액압실(31,32) 쪽으로 오일이 원활히 공급될 수 있도록 한 것이다.The inner surface of the bore 21 between the first and second oil inlets 53, 54 and the supporting grooves 29 for receiving the second and fourth sealing members 26, 28 are shown in FIGS. 3 and 4. As shown, from the pistons 23 and 24, an oil flow path 62 larger than the cross-sectional area of the first or second oil inlets 53 and 54 can be formed between the inner surface of the bore and the outer surface of the pistons 23 and 24. A spaced portion 61 spaced apart is provided. This allows the oil to flow smoothly from the first and second oil inlets 53 and 54 toward the communication holes 55 and 56 of the pistons 23 and 24, thereby allowing the first and second hydraulic pressures from the oil tank (not shown). It is to allow oil to be smoothly supplied to the seals (31, 32).

제2 및 제4실링부재(26,28)가 설치된 지지홈들(29)에는 도 4에 도시한 바와 같이, 제2 및 제4실링부재(26,28)가 이격부(61) 쪽으로 이탈하는 것을 방지하기 위한 지지링(63)이 설치된다. 그리고 이 지지링(63)에는 도 4와 도 5에 도시한 바와 같이, 내주연 쪽에 다수의 오일유통홈(64)이 형성된다. 이는 제2 및 제4실링부재(26,28)가 지지링(63)에 의해 지지됨으로써 이탈이 방지되도록 함과 동시에 지지링(63)의 오일유통홈들(64)을 통하여 오일이 흐르도록 함으로써 각 오일유입구(53,54) 쪽으로부터 각 피스톤(23,24)의 연통공(55,56) 쪽으로 오일의 흐름이 원활하도록 한 것이다.As shown in FIG. 4, the second and fourth sealing members 26 and 28 are installed in the supporting grooves 29 provided with the second and fourth sealing members 26 and 28, and the second and fourth sealing members 26 and 28 are separated from the spacer 61. Support ring 63 is installed to prevent the. 4 and 5, a plurality of oil distribution grooves 64 are formed on the inner circumferential side of the support ring 63. This is because the second and fourth sealing members 26 and 28 are supported by the support ring 63 to prevent the separation and at the same time the oil flows through the oil distribution grooves 64 of the support ring 63. The oil flows smoothly from the oil inlets 53 and 54 toward the communication holes 55 and 56 of the pistons 23 and 24, respectively.

다음은 이러한 마스터실린더의 전체적인 동작에 관하여 설명한다.The following describes the overall operation of such a master cylinder.

제동동작에 의하여 제1피스톤(23)이 가압되면 제1피스톤(23)이 전진하면서 제1액압실(31)을 가압하고, 제1액압실(31)이 가압되면 이 압력에 의해 제2피스 톤(24)이 가압되어 전진하므로 제2액압실(32)이 가압된다. 따라서 제1 및 제2액압실(31,32)의 오일은 제1 및 제2오일배출공(33,34)을 통하여 바퀴 측의 휠 실린더(미도시)로 공급되어 제동이 이루어질 수 있도록 한다.When the first piston 23 is pressurized by the braking operation, the first piston 23 advances and presses the first hydraulic pressure chamber 31. When the first hydraulic pressure chamber 31 is pressurized, the second piece is driven by this pressure. The ton 24 is pressurized and advanced so that the second 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.

제동동작을 해제하면 제1복원스프링(35)과 제2복원스프링(36)의 탄성에 의해 제1및 제2피스톤(23,24)이 후방으로 밀리므로 제1 및 제2피스톤(23,24)이 원상태로 복원된다. 이때는 제1 및 제2오일유입구(53,54), 이격부(61)와 각 피스톤(23,24) 외면 사이의 이격된 오일유로(62), 각 피스톤(23,24)의 연통공들(55,56)을 통하여 오일이 흐를 수 있게 되므로 오일탱크로부터 각 액압실(31,32)로 오일이 공급될 수 있다. 특히 본 발명은 이격부(61)와 각 피스톤(23,24) 외면 사이의 이격된 오일유로(62)가 각 오일유입구(53,54)의 단면적보다 크기 때문에 제1 및 제2오일유입구(53,54)로부터 각 액압실(31,32)로 공급되는 오일의 흐름이 원활히 이루어질 수 있다.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. In this case, the oil passage 62 spaced between the first and second oil inlets 53 and 54, the spacer 61, and the outer surfaces of the pistons 23 and 24, and communication holes of the pistons 23 and 24 ( Since oil may flow through 55 and 56, oil may be supplied from the oil tank to each of the hydraulic chambers 31 and 32. In particular, in the present invention, since the spaced oil passage 62 between the spacer 61 and the outer surfaces of the respective pistons 23 and 24 is larger than the cross-sectional area of each oil inlet 53, 54, the first and second oil inlets 53 are formed. The flow of the oil supplied to each of the hydraulic chambers 31 and 32 from 54 may be smoothly performed.

이상에서 상세히 설명한 바와 같이, 본 발명에 따른 브레이크시스템용 마스터실린더는 보어의 내면에 형성되는 이격부에 의하여 오일탱크 쪽과 각 액압실 사이의 오일유로가 확대되기 때문에 오일탱크 쪽으로부터 액압실 쪽으로의 오일의 흐름이 원활해지도록 할 수 있는 효과가 있다.As described in detail above, in the master cylinder for the brake system according to the present invention, since the oil flow path between the oil tank side and each hydraulic chamber is enlarged by the spaced portion formed on the inner surface of the bore, the oil cylinder side is moved from the oil tank side to the hydraulic chamber. There is an effect that can facilitate the flow of oil.

또한 본 발명은 실링부재가 설치되는 지지홈들 내부에 실링부재를 지지하는 지지링이 설치되기 때문에 실링부재의 이탈을 방지할 수 있는 효과가 있다. 또 지지링에도 다수의 오일유통홈이 형성되기 때문에 오일탱크 쪽으로부터 액압실 쪽으 로의 오일의 흐름이 원활해지도록 할 수 있다.In addition, the present invention has an effect that can prevent the departure of the sealing member because the support ring for supporting the sealing member is installed in the support grooves in which the sealing member is installed. In addition, since a plurality of oil distribution grooves are formed in the support ring, it is possible to smooth the flow of oil from the oil tank side to the hydraulic chamber.

Claims (2)

내부에 보어가 형성된 실린더본체와, 상기 보어 내부의 액압실을 가압하기 위해 상기 보어 내부에 진퇴 가능하게 설치된 적어도 하나의 피스톤과, 상기 피스톤과 상기 보어 내면 사이의 밀폐를 위해 상기 보어 내면의 상호 이격된 위치에 설치된 복수의 실링부재와, 상기 실링부재의 설치를 위헤 상기 보어의 내면에 형성된 지지홈과, 상기 액압실로 오일을 공급할 수 있도록 상기 복수의 실링부재 사이의 상기 실린더본체에 형성된 오일유입구와, 상기 피스톤이 후퇴한 상태에서 상기 오일유입구와 상기 액압실이 연통될 수 있도록 상기 피스톤에 형성된 연통공을 포함하는 브레이크시스템용 마스터실린더에 있어서,A cylinder body having a bore formed therein, at least one piston removably installed in the bore to pressurize the hydraulic chamber inside the bore, and a mutual separation between the bore inner surface for sealing between the piston and the bore inner surface A plurality of sealing members installed at a predetermined position, a support groove formed on an inner surface of the bore for installation of the sealing member, and an oil inlet formed in the cylinder body between the plurality of sealing members to supply oil to the hydraulic chamber; In the master cylinder for a brake system comprising a communication hole formed in the piston so that the oil inlet and the hydraulic chamber can communicate with the piston in a retracted state, 상기 오일유입구와 상기 지지홈 사이의 상기 보어 내면에는 상기 보어내면과 상기 피스톤 외면 사이에 상기 오일유입구의 단면적보다 큰 오일유로가 형성될 수 있도록 상기 피스톤으로부터 이격된 이격부가 마련되고, The bore inner surface between the oil inlet and the support groove is provided with a spaced apart from the piston so that an oil passage larger than the cross-sectional area of the oil inlet is formed between the bore inner surface and the piston outer surface. 상기 지지홈에는 상기 실링부재가 상기 이격부 쪽으로 이탈하는 것을 방지하기 위해 상기 실링부재를 지지하는 지지링이 설치된 것을 특징으로 하는 브레이크시스템용 마스터실린더.The support groove is a master cylinder for the brake system, characterized in that the support ring for supporting the sealing member is installed to prevent the sealing member from being separated toward the separation portion. 제1항에 있어서,The method of claim 1, 상기 지지링은 내주연 쪽에 형성된 다수의 오일유통홈을 포함하는 것을 특징으로 하는 브레이크시스템용 마스터실린더.The support ring is a master cylinder for a brake system, characterized in that it comprises a plurality of oil distribution groove formed on the inner peripheral side.
KR1020070028598A 2007-03-23 2007-03-23 Master Cylinder for Brake System KR101134900B1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113442886A (en) * 2020-03-26 2021-09-28 比亚迪股份有限公司 Brake master cylinder, hydraulic brake system and vehicle

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JP2002173015A (en) * 2000-12-06 2002-06-18 Hokushin Ind Inc Piston cup
JP4286548B2 (en) 2003-01-31 2009-07-01 株式会社日立製作所 Master cylinder
WO2004094208A1 (en) * 2003-04-23 2004-11-04 Bosch Corporation Plunger-type master cylinder
JP4388838B2 (en) * 2004-03-23 2009-12-24 ボッシュ株式会社 Cup seal and master cylinder using the same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113442886A (en) * 2020-03-26 2021-09-28 比亚迪股份有限公司 Brake master cylinder, hydraulic brake system and vehicle

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