KR101982272B1 - Pump for brake system - Google Patents

Pump for brake system Download PDF

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Publication number
KR101982272B1
KR101982272B1 KR1020140069265A KR20140069265A KR101982272B1 KR 101982272 B1 KR101982272 B1 KR 101982272B1 KR 1020140069265 A KR1020140069265 A KR 1020140069265A KR 20140069265 A KR20140069265 A KR 20140069265A KR 101982272 B1 KR101982272 B1 KR 101982272B1
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KR
South Korea
Prior art keywords
piston
diameter
hollow
pump
passage
Prior art date
Application number
KR1020140069265A
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Korean (ko)
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KR20150140970A (en
Inventor
허영채
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주식회사 만도
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Priority to KR1020140069265A priority Critical patent/KR101982272B1/en
Publication of KR20150140970A publication Critical patent/KR20150140970A/en
Application granted granted Critical
Publication of KR101982272B1 publication Critical patent/KR101982272B1/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
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
    • B60T8/34—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition
    • B60T8/40—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition comprising an additional fluid circuit including fluid pressurising means for modifying the pressure of the braking fluid, e.g. including wheel driven pumps for detecting a speed condition, or pumps which are controlled by means independent of the braking system
    • B60T8/4031—Pump units characterised by their construction or mounting
    • 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
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
    • B60T8/34—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition
    • B60T8/40—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition comprising an additional fluid circuit including fluid pressurising means for modifying the pressure of the braking fluid, e.g. including wheel driven pumps for detecting a speed condition, or pumps which are controlled by means independent of the braking system
    • B60T8/4018—Pump units characterised by their drive mechanisms
    • B60T8/4022—Pump units driven by an individual electric motor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
    • F04B17/03—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/10—Valves; Arrangement of valves
    • F04B53/1002—Ball valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/14—Pistons, piston-rods or piston-rod connections
    • F04B53/143—Sealing provided on the piston
    • 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
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K27/00—Construction of housing; Use of materials therefor
    • F16K27/02—Construction of housing; Use of materials therefor of lift valves
    • F16K27/0245—Construction of housing; Use of materials therefor of lift valves with ball-shaped valve members
    • 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
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
    • F16K31/122—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a piston

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Transportation (AREA)
  • Details Of Reciprocating Pumps (AREA)
  • Valves And Accessory Devices For Braking Systems (AREA)

Abstract

A pump for a brake system is disclosed. A brake system pump according to an embodiment of the present invention is a pump for a brake system provided in a bore of a modulator block communicating with a suction port and a discharge port, comprising: a valve seat having a compression chamber therein for pressurizing a fluid; And a piston which forms a valve seat and a compression chamber and is provided to linearly reciprocate the inside of the modulator block bore, wherein the piston is accommodated in the valve seat and has a hollow in the longitudinal direction, the piston being extended and coupled to the first piston. And a second piston in contact with the eccentric spindles of the first piston, wherein the hollow diameter of the first piston is greater than the diameter of the second piston, and the first piston generated by the difference in diameter between the hollow diameter of the first piston and the second piston. The longitudinal hollow of the suction flow path connects the suction port and the compression chamber.

Description

Pump for brake system

The present invention relates to a pump for a brake system, and more particularly to a pump for a brake system that can improve the efficiency and manufacturability of the pump.

In general, ABS, ESC, EHB, etc. are installed in the brake system installed in the vehicle, and the brake system controls the brake hydraulic pressure of the vehicle so as to secure driving stability of the vehicle.

Conventional brake systems control a plurality of solenoid valves, low pressure accumulators and high pressure accumulators for temporarily storing oil discharged from hydraulic brakes, motors and pumps for pumping oil temporarily stored in low pressure accumulators, and control solenoid valves and motor operation. An electronic control unit (ECU), and these components are embedded in a modulator block made of aluminum.

Among these, the pump serves to adjust the hydraulic pressure supplied to the wheel cylinder of the brake. Korean Patent Registration No. 514409 discloses a pump of an anti-lock brake system.

Korea Patent Registration No. 10-0514409 (2005.09.05.) Said document is cross-molded with a horizontal through hole and a vertical through hole inside the piston of the pump, so that oil is sucked into the horizontal through hole of the piston through the radial inlet of the modulator block and discharged through the vertical through hole to the outlet. However, the oil inflow through the horizontal through-holes may cause a flow resistance because the phase difference between the piston and the vertical reciprocating operation is arranged at a right angle. In addition, the horizontal through holes and the vertical through holes are required to be cut, so the manufacturing process is complicated, and burrs or chips may be generated during the machining, and subsequent processes are required, thereby increasing the manufacturing cost.

An embodiment of the present invention is to provide a pump for a brake system improved efficiency and manufacturability.

According to an aspect of the present invention, a brake system pump provided in a bore of a modulator block in communication with a suction port and a discharge port, comprising: a valve seat having a compression chamber therein for pressurizing a fluid; And a piston which forms a compression chamber and is provided to linearly reciprocate the inside of the modulator block bore, wherein the piston is accommodated in the valve seat and has a hollow in the longitudinal direction, and extends and is coupled to the eccentric spindle of the motor. A second piston in contact, wherein the hollow diameter of the first piston is greater than the diameter of the second piston, and the longitudinal hollow of the first piston is generated by the difference in diameter between the hollow diameter of the first piston and the second piston. The pump for the brake system may be provided to form a suction passage connecting the suction port and the compression chamber.

In addition, the compression chamber further includes an inlet valve through which the fluid is introduced, and the suction passage includes a hollow sharing passage provided to communicate with the inlet valve, and an expanding passage extending from the hollow sharing passage and having a larger diameter than the hollow sharing passage. The diameter of the second piston may be smaller than that of the expansion passage.

In addition, the expansion passage may be provided with at least one guide projection in the longitudinal direction therein, the guide projection may include a step portion for limiting the introduction of the second piston when the first piston and the second piston is coupled.

In addition, the second piston may be provided in a rod shape.

According to another aspect of the present invention, a brake system pump provided in a bore of a modulator block in communication with a suction port and a discharge port, comprising: a valve seat having a compression chamber for pressurizing a fluid therein; A piston seated in the valve seat to form a compression chamber and linearly reciprocating the inside of the modulator block bore, and a suction passage provided in the piston in the reciprocating direction of the piston to connect the suction port to the compression chamber; A pump for the brake system can be provided.

The apparatus may further include a filter member coupled to the valve seat, and the piston may include a first piston accommodated in the valve seat and a second piston coupled to the first piston and accommodated in the filter member.

The compression chamber may include an inlet valve through which fluid is introduced and an outlet valve through which the fluid flows in. The suction passage extends in a longitudinal direction from the hollow sharing passage in a longitudinal direction provided in the longitudinal direction to communicate with the inlet valve in the first piston. And an expansion passage having a larger diameter than the hollow sharing passage, and the diameter of the second piston may be smaller than the expansion passage.

In addition, the expansion passage may be provided with at least one guide projection in the longitudinal direction therein, the guide projection may include a step portion for limiting the introduction of the second piston when the first piston and the second piston is coupled.

In the pump for the brake system according to the exemplary embodiment of the present invention, since the suction flow path of the piston into which the fluid is sucked is the same as the reciprocating direction of the piston, the flow resistance of the fluid is small and the suction efficiency is high.

In addition, the pump for the brake system according to the embodiment of the present invention is excellent in workability because the suction flow path provided in the piston is provided in a hollow form along the longitudinal direction, and further coupled to the first piston in which the suction flow path is provided. Since the piston is provided in a simple rod form, the manufacturability is excellent.

1 is a view illustrating a hydraulic circuit diagram of an electronically controlled brake system in which a pump for a brake system is installed according to an embodiment of the present invention.
2 is a cross-sectional view of a modulator block provided with a pump for a brake system according to an embodiment of the present invention.
3 is an exploded view illustrating a first piston and a second piston of a pump for a brake system according to an exemplary embodiment of the present invention.
4 is a bottom view illustrating a first piston of a pump for a brake system according to an exemplary embodiment of the present invention.
5 is a cross-sectional view taken along the line VV of FIG. 4.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms or words used in the specification and claims should not be construed as having a conventional or dictionary meaning, and the inventors should properly explain the concept of terms in order to best explain their own invention. Based on the principle that can be defined, it should be interpreted as meaning and concept corresponding to the technical idea of the present invention. Therefore, the embodiments described in the specification and the drawings shown in the drawings are only the most preferred embodiment of the present invention and do not represent all of the technical idea of the present invention, various modifications that can be replaced at the time of the present application It should be understood that there may be equivalents and variations.

1 is a hydraulic circuit diagram of a general brake system in which a pump for a brake system is installed according to an exemplary embodiment of the present invention.

As shown, the modulator block 10 of the electronically controlled brake system includes a plurality of solenoid valves 11a and 11b for opening and closing the flow path formed therein, a motor 13 and a hydraulic pump 20 for pressurizing returning oil. ) And a low pressure accumulator 12 and a high pressure accumulator 15 disposed on the upstream and downstream flow paths of the hydraulic pump 20, respectively. These components are interconnected through a plurality of flow paths formed inside the modulator block 10, each of which is controlled by an electronic control unit (not shown) from the master cylinder 16 to the wheel-side wheel cylinder 17 It performs a function to control the delivered braking hydraulic pressure.

Here, the hydraulic pump 20 pressurizes the brake oil returned to the low pressure accumulator 12 along the hydraulic line and presses the brake oil to the wheel-side wheel cylinder 17 so as to brake the wheel.

2 is a view showing a pump for a brake system according to an embodiment of the present invention.

Referring to the drawings, the pump for the brake system of this embodiment is installed at the open end of the modulator block 100 having a bore 102 formed to communicate with the fluid suction port 101 and the discharge port 103. On the other open end of the bore 102, eccentric spindles 106 of the motor are installed, and the eccentric spindles 106 are integrally formed with the eccentric shaft of the motor and disposed between the pistons of the pumps respectively provided in the pair of hydraulic circuits. As a result, the pair of pistons are driven with a phase difference of 180 degrees from each other by one motor.

The brake system pump 110 of the present embodiment includes a valve seat 120 having a compression chamber C1 and a pressurized fluid in the compression chamber C1 as a chamber space for compressing and discharging the fluid flowing into the pump. Outlet valve 130 for opening and closing the orifice provided in the valve seat 120 to selectively discharge the inlet valve, the inlet valve 140 for selectively opening and closing the fluid suction port 101 and the compression chamber (C1) of the modulator block and The filter assembly 170 is assembled with the valve seat 120, and the piston 160 is provided at the filter assembly 170 and disposed to be linearly reciprocated in the bore 102.

The valve seat 120 is provided in a cylindrical shape, the bottom of which is open, and has a hollow (outlet) orifice 121 at the top. The valve seat 120 is fixedly installed in the bore 102 so as to partition the inside of the bore into the compression chamber C1 and the discharge chamber C2. The compression chamber C1 is further divided into a compression chamber and a suction flow path by the piston 160, which will be described later. The pump cap 125 is coupled to the discharge chamber C2 to block the inside of the open bore 102 from the outside, and the fluid discharged through the orifice 121 between the pump cap 125 and the valve seat 120. A discharge passage 127 for guiding the discharge toward the discharge port 103 is provided.

The outlet valve 130 includes a spherical first shielding member 132 that blocks the orifice 121, and a first valve spring 134 that elastically supports the first shielding member 132. The first shielding member 132 blocks the orifice 121 by the elastic force of the first valve spring 134 and is pushed by the pressure when the fluid in the compression chamber C1 is compressed by the piston 160. Open the orifice 121. The first valve spring 134 is fixed by the support groove 129 provided in the pump cap 125. The pump cap 125 and the valve seat 120 may be coupled in various ways such as press-fitting and welding.

The inlet valve 140 has a spherical second shield member 142 that blocks the (inlet) orifice 141 between the compression chamber C1 and the suction port 102 partitioned by the piston 160, and the second shield. A second valve spring 144 elastically supports the member 142 and an inlet plate 146 coupled to the fluid downstream end of the piston 160 to support the second valve spring 144. The second shielding member 142 blocks the orifice 141 by the elastic force of the second valve spring 144, and when the fluid is discharged from the compression chamber C1 and the internal pressure drops, the pressure difference between the inside and the compression chamber C1 is reduced. The orifice 141 is opened by the.

On the other hand, between the valve seat 120 and the piston 160, that is, in the compression chamber (C1) elasticity of the piston 160 toward the eccentric spindle 106 in order to return the piston 160 moved to compress the fluid to its original position. Supporting return spring 150 is installed. The return spring 150 has a relatively large diameter so as not to overlap the second valve spring 144 of the inlet valve 140, and one end of the piston side is supported by the inlet plate 146. A sealing S1 is provided between the inlet plate 146 and the piston 160 to seal the compression chamber C1. Sealing (S1) is installed on a step provided on the outside of the piston 160, the upper and lower portions are firmly supported by the inlet plate 146 and the piston 160, respectively.

The piston 160 includes a first piston 161 and a second piston 168. As shown in FIG. 2, the first piston 161 is accommodated in the valve seat 120, and the second piston 168 protrudes from the valve seat 120 to contact the eccentric spindles 106.

The first piston 161 includes a suction passage 162 provided in a hollow shape along the longitudinal direction therein. The suction passage 162 is a hollow common passage 162a provided in the longitudinal direction so as to communicate with the inlet valve 140 from the top, and an extended passage extending in the longitudinal direction from the hollow common passage 162a and having a larger diameter than the hollow shared passage ( 162b). The hollow sharing passage 162a has a diameter substantially similar to the orifice 141 in which the inlet valve 140 is installed.

At least two or more guide protrusions 163 in the longitudinal direction are provided in the expansion passage 162b to be spaced apart from each other in the circumferential direction. In the present embodiment, three are installed at intervals of 120 degrees, but the present invention is not limited thereto. As the guide protrusion 163 increases, the amount of fluid flowing into the compression chamber C1 through the suction passage 162 decreases, whereas the coupling force with the second piston increases.

An end of the guide protrusion 163 is provided with a stepped portion 165 for limiting the inlet of the second piston 168 when the first piston 161 and the second piston 168 are coupled. As shown in FIG. 3, the diameter T3 of the stepped portion 165 is the same as the diameter of the second piston 168 and is smaller than the diameter T1 of the expansion passage 162b and the diameter of the guide protrusion 163 ( It is larger than T2). The reason for limiting the diameter of the stepped portion 165 is the stepped portion 165, that is, the hollow due to the difference in diameter between the second piston 168 and the expansion flow path 162b forms a suction flow path through which the fluid flows, This is because the total length of the first piston 161 and the second piston 168 is determined by the diameter difference between the second piston 168 and the guide protrusion 163.

Since the first piston 161 having the suction flow path 162 as described above can be processed by forging instead of cutting, since both the hollow sharing path and the expansion flow path provided in the longitudinal direction are provided in the longitudinal direction, the manufacturing cost is reduced. Significant savings can be achieved. In addition, since the second piston 168 of the present embodiment is also provided in a simple rod shape, manufacturing cost and workability are excellent.

On the other hand, one end of the filter assembly 170 is coupled to the valve seat 120, the other end includes a filter housing 172 and the filter member 174 to support the second piston 168 in a linear reciprocating manner. .

One end of the filter housing 172 is simply assembled using a coupling member such as a valve seat 120 and a guide protrusion and a locking groove, and the other end is a sealing member for sealing the piston 160 between the piston 160. (S2). The filter member 174 is provided in front of the suction passage 162 to filter the foreign matter contained in the fluid flowing into the piston through the suction port 101.

The pump 110 for the brake system provided as described above has a linear reciprocating motion of the piston 160 as the eccentric spindles 106 of the motor rotate, and accordingly, the inlet valve ( 140 and the outlet valve 130 are operated in opposition to each other to pressurize the fluid on the suction port 101 to pump to the discharge port 103.

That is, when the piston 160 moves toward the pump cap 125 through the rotational operation of the eccentric spindle 106, the pressure in the compression chamber C1 chamber of the valve seat 120 is increased to close the inlet valve 140. The outlet valve 130 is opened. Therefore, the fluid inside the compression chamber of the valve seat 120 discharges the discharge port 103.

On the other hand, when the piston 160 moves toward the motor, a low pressure is formed in the compression chamber chamber of the valve seat 120 so that the inlet valve 140 is opened and the outlet valve 130 is closed. Therefore, the fluid introduced into the suction flow path 162 through the suction port 101 is filled in the compression chamber C1 of the valve seat 120.

In this state, when the piston 160 moves toward the pump cap 125 by the eccentric spindle 106, the fluid of the compression chamber C1 of the valve seat 120 is pressurized and discharged toward the discharge port 103. As such, the pumping operation of compressing and discharging the fluid is continuously performed by repeating the above-described process.

In addition, during the fluid pumping operation, particularly the suction operation of the pump, the fluid flows into the compression chamber C1 through the suction passage 162 provided in the longitudinal direction in the same direction as the reciprocating operation of the piston 160, so that the flow resistance of the fluid This does not occur and the suction efficiency is increased.

100. Modulator block 101. Suction port
102 .. bore 103 .. discharge port
110.Pump 120.Valve seat
130. Outlet valve 140. Inlet valve
160 .. piston 161 .. first piston
162 .. Suction passage 163 .. Guide protrusion
170. Filter assembly

Claims (9)

A pump for a brake system provided in a bore of a modulator block in communication with a suction port and a discharge port,
A valve seat having a compression chamber therein for pressurizing the fluid, and a piston which forms the valve seat and the compression chamber and is provided to linearly reciprocate the inside of the modulator block bore,
The piston includes a first piston received in the valve seat and having a hollow in the longitudinal direction, and a second piston extending in engagement with the first piston to contact the eccentric spindles of the motor,
The hollow diameter of the first piston is provided to be larger than the diameter of the second piston, and when the first and second pistons are combined, the hollow diameter of the first piston is generated by the difference in diameter between the hollow diameter of the first piston and the second piston. The longitudinal hollow pump of the brake system to form a suction passage connecting the suction port and the compression chamber. The method of claim 1,
The compression chamber further includes an inlet valve into which the fluid is introduced,
The suction passage includes a heavy sharing passage provided to communicate with the inlet valve, and an expansion passage extending from the heavy sharing passage and having a larger diameter than the heavy sharing passage,
And a diameter of the second piston is smaller than that of the expansion passage. The method of claim 2,
The expansion passage provides at least one guide protrusion in the longitudinal direction therein,
The guide protrusion is a pump for a brake system including a step portion for limiting the inlet of the second piston when the first piston and the second piston is coupled. The method of claim 1,
The second piston is a pump for a brake system provided in a rod shape. A pump for a brake system provided in a bore of a modulator block in communication with a suction port and a discharge port,
A valve seat having a compression chamber for pressurizing the fluid therein, a piston which is accommodated in the valve seat to form a valve seat and a compression chamber, and is provided to linearly reciprocate the inside of the modulator block bore; A suction flow path provided in the reciprocating direction and connecting the suction port and the compression chamber,
Further comprising a filter member for coupling with the valve seat,
The piston includes a first piston received in the valve seat, and a second piston coupled to the hollow of the first piston and received in the filter member,
The hollow diameter of the first piston is provided to be larger than the diameter of the second piston, and the longitudinal hollow of the first piston generated by the difference in diameter between the hollow diameter of the first piston and the second piston causes the suction passage to pass through. Pump for brake system to form. delete The method of claim 5,
The compression chamber includes an inlet valve into which fluid is introduced and an outlet valve discharged therefrom,
The suction passage includes a hollow sharing passage provided in the longitudinal direction so as to communicate with the inlet valve on the first piston, an expansion passage extending in the longitudinal direction from the hollow sharing passage and having a larger diameter than the hollow sharing passage,
And a diameter of the second piston is smaller than that of the expansion passage. The method of claim 7, wherein
The expansion passage provides at least one guide protrusion in the longitudinal direction therein,
The guide protrusion is a pump for a brake system including a step portion for limiting the inlet of the second piston when the first piston and the second piston is coupled. The method of claim 5,
The second piston is a pump for a brake system provided in a rod shape.

KR1020140069265A 2014-06-09 2014-06-09 Pump for brake system KR101982272B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020140069265A KR101982272B1 (en) 2014-06-09 2014-06-09 Pump for brake system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020140069265A KR101982272B1 (en) 2014-06-09 2014-06-09 Pump for brake system

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KR20150140970A KR20150140970A (en) 2015-12-17
KR101982272B1 true KR101982272B1 (en) 2019-08-28

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Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102500703B1 (en) * 2016-01-19 2023-02-16 에이치엘만도 주식회사 Brake System
KR102368496B1 (en) * 2017-07-31 2022-03-02 현대모비스 주식회사 Pump device for electronic control brake system

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100673053B1 (en) * 2002-02-08 2007-01-23 주식회사 만도 Pump of electronic control brake system
KR100514409B1 (en) 2004-03-22 2005-09-09 현대모비스 주식회사 A pump of anti-lock brake system for vehicles
KR100550947B1 (en) * 2004-05-17 2006-02-13 현대모비스 주식회사 pump for a brake system
KR20130112377A (en) * 2012-04-04 2013-10-14 주식회사 만도 Piston and pump for brake system including the same

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