KR102368496B1 - Pump device for electronic control brake system - Google Patents

Abstract

The present invention relates to a pump device for an electronically controlled brake system, comprising a housing part, a motor cam part mounted on the housing part, a piston part built in the housing part and moved by friction with the motor cam part, and connected to the piston part A pressing part that guides the oil and allows up-and-down flow of the piston part, an inlet part that is built in the housing part, is inserted into the pressing part, and stores the oil supplied through the pressing part, is built in the housing part and is coupled to the inlet part to surround the piston part A filter part that prevents foreign substances from entering the piston, a sealing part disposed between the inlet part and the pressing part to prevent leakage, and a housing part built in and selectively allowing oil to be discharged according to the pressure of the oil stored in the inlet part. Including the discharge part, it is possible to suppress damage to the seal part due to flow during operation.

Description

PUMP DEVICE FOR ELECTRONIC CONTROL BRAKE SYSTEM

The present invention relates to a pump device for an electronically controlled brake system, and more particularly, to a pumping device for an electronically controlled brake system that relieves an impact during operation and suppresses damage to a sealing portion due to flow.

In general, an electronically controlled brake system is to obtain a strong and stable braking force by effectively preventing the slip phenomenon of a vehicle. Brake Traction Control System (BTCS), which prevents slipping of the driving wheels during sudden acceleration or sudden acceleration A vehicle dynamic control system (VDC) and the like are disclosed.

A conventional electronically controlled brake system includes a plurality of solenoid valves for controlling braking oil pressure transmitted to a hydraulic brake mounted on a wheel of a vehicle, and a low-pressure accumulator and low-pressure accumulator for temporarily storing oil escaping from the hydraulic brake. It consists of a motor and a pump for forced pumping, a solenoid valve and an ECU for controlling the driving of the motor.

In such a conventional electronically controlled brake system, oil is pressurized by driving of a pump and delivered to the hydraulic brake or the master cylinder assembly.

Conventionally, one end surface of the piston is in contact with the motor cam to drive the pump, and when the motor cam is rotated, friction occurs between the end of the piston and the motor cam. Due to this, the piston not only moves in a linear direction, but also both ends flow up and down. The upwardly moving end of the piston applies a load to the sealing part, which causes wear. Therefore, there is a need to improve it.

Background art of the present invention is published in Korean Patent Publication No. 2016-0067488 (published on Jun. 14, 2016, title of invention: Pump unit for electronically controlled brake system).

The present invention has been devised to improve the above problems, and an object of the present invention is to provide a pump device for an electronically controlled brake system that relieves an impact during a motor operation process and suppresses damage to a sealing portion due to flow.

A pump device for an electronically controlled brake system according to the present invention includes: a housing; a motor cam unit mounted to the housing unit; a piston part embedded in the housing part and moved by friction with the motor cam part; a pressing unit connected to the piston unit to guide the oil, and to allow vertical flow of the piston unit; an inlet part embedded in the housing part, into which the pressing part is inserted, and storing oil supplied through the pressing part; a filter part embedded in the housing part, coupled to the inlet part, surrounding the piston part, and preventing foreign substances from being introduced into the piston part; a sealing part disposed between the inlet part and the pressing part to prevent leakage; and a discharging unit built in the housing unit and selectively allowing discharging of oil according to the pressure of the oil stored in the inlet unit.

The pressing unit includes: a first pressure connection unit press-fitted to the piston unit; and a first pressure induction part rotatably coupled to the first pressure connection part and guiding the oil.

The first pressure connection portion includes a first connection insertion portion inserted into the first pressure groove formed in the piston portion; and a first connecting rotation part extending from the first connection insertion part and having a spherical surface that is rotatable in the first pressure induction part.

The first pressure guiding part is formed with a stepped part on the outside and a first guiding pipe part for guiding the oil; and a plurality of first induction coupling portions protruding apart from the first guide tube portion, and having a spherical surface formed therein so that the first pressure connection portion is in surface contact.

The first pressure guiding part is formed at the end of the first guiding part, and a first guiding groove part for guiding the oil; characterized in that it further comprises.

The pressing portion is integrally formed with the piston portion, the second pressure connecting portion forming a spherical surface; and a second pressure inducing part rotatably coupled to the second pressure connecting part and guiding the oil.

a third pressure connection part formed integrally with the piston part to form a spherical surface, and a third connection hole part communicating with a third piston hole part formed in the piston part; and a third pressure guiding part into which the third pressure connection part is rotatably inserted and which guides the oil to be moved to the third connection hole part.

a fourth compression connection part inserted into the piston part and rotatably connected to the piston part; and a fourth pressure induction part extending from the fourth pressure connection part and guiding the oil.

A plurality of the fourth pressure connecting portions are spaced apart from each other to have a spherical surface formed on the outside, and are inserted into a fourth pressure groove formed in the piston unit.

The fourth pressure guiding part is formed with a stepped portion on the outside and a fourth guiding pipe part for guiding the oil; a fourth guide extension part extending from the fourth guide pipe part and forming the fourth pressure connection part; and a fourth guide hole formed in the fourth guide extension part and communicating with the fourth guide pipe part to guide the oil.

In the pump device for an electronically controlled brake system according to the present invention, since the pressing part coupled to the piston moves linearly while allowing up-and-down flow of the piston part, it is possible to prevent damage to the sealing part and improve durability.

In the pump device for an electronically controlled brake system according to the present invention, the first pressure connection part is press-fitted to the piston part and is rotatably coupled to the first pressure induction part to induce linear movement of the first pressure induction part.

In the pump device for an electronically controlled brake system according to the present invention, the second pressure connection part is integrally formed with the piston part and is rotatably coupled to the second pressure guide part to induce linear movement of the second pressure guide part.

In the pump device for an electronically controlled brake system according to the present invention, the third pressure connecting portion is integrally formed with the piston, and is rotatably coupled to the third pressure inducing portion to induce linear movement of the third pressure inducing portion.

In the pump device for an electronically controlled brake system according to the present invention, the fourth pressure connection part and the fourth pressure induction part are integrally formed, and the fourth pressure connection part and the piston part are rotatably coupled to induce linear movement of the fourth pressure induction part. there is.

1 is a diagram schematically showing a pump device for an electronically controlled brake system according to an embodiment of the present invention.
2 is a diagram schematically illustrating a state in which oil is supplied to an inlet in the pump device for an electronically controlled brake system according to an embodiment of the present invention.
3 is a diagram schematically illustrating a state in which oil is discharged through a discharge unit in the pump device for an electronically controlled brake system according to an embodiment of the present invention.
4 is a view schematically showing a first embodiment of the pressing unit in the pump device for an electronically controlled brake system according to an embodiment of the present invention.
5 is a view schematically showing a second embodiment of the pressing unit in the pump device for an electronically controlled brake system according to an embodiment of the present invention.
6 is a view schematically showing a third embodiment of the pressing unit in the pump device for an electronically controlled brake system according to an embodiment of the present invention.
7 is a view schematically showing a fourth embodiment of the pressing unit in the pump device for an electronically controlled brake system according to an embodiment of the present invention.

Hereinafter, an embodiment of a pump device for an electronically controlled brake system according to the present invention will be described with reference to the accompanying drawings. In this process, the thickness of the lines or the size of the components shown in the drawings may be exaggerated for clarity and convenience of explanation. In addition, the terms to be described later are terms defined in consideration of functions in the present invention, which may vary according to intentions or customs of users and operators. Therefore, definitions of these terms should be made based on the content throughout this specification.

1 is a diagram schematically showing a pump device for an electronically controlled brake system according to an embodiment of the present invention, and FIG. 2 is a diagram in which oil is supplied to an inlet in the pump device for an electronically controlled brake system according to an embodiment of the present invention. 3 is a diagram schematically illustrating a state in which oil is discharged through a discharge unit in the pump device for an electronically controlled brake system according to an embodiment of the present invention. 1 to 3 , a pump device 1 for an electronically controlled brake system according to an embodiment of the present invention includes a housing 10 , a motor cam 20 , a piston 30 , and a press It includes a part 40 , an inlet part 50 , a filter part 60 , a sealing part 70 , and an exhaust part 80 .

The housing unit 10 may be mounted on a vehicle, and an inlet for introducing oil and an outlet for discharging oil may be formed. For example, the housing unit 10 is mounted on the wheel, and when the wheel pressure reduction is required, the oil stored in the wheel may be discharged to the master cylinder. And, when it is necessary to increase the wheel pressure, the oil stored in the master cylinder can be discharged toward the wheel.

The motor cam unit 20 is mounted on the housing unit 10 . For example, the motor cam unit 20 may have a cam shape, and may press the piston unit 30 while rotating when the motor is driven.

The piston part 30 is built into the housing part 10 and is moved by friction with the motor cam part 20 . The pressing part 40 is coupled to the end of the piston part 30 to guide the oil and allow the piston part 30 to flow up and down. That is, the end of the piston unit 30 may flow up and down while pushing the pressing unit 40 , and the pressing unit 40 is connected so that the piston unit 30 is rotatably connected to the pressing unit 40 itself. Up-and-down flow can be prevented.

The inlet part 50 is built into the housing part 10 , and the pressing part 40 is inserted thereinto. The inlet part 50 stores the oil supplied through the pressing part 40 . For example, the inlet part 50 includes an inlet external cylinder part 51 , an external spring part 52 , an inflow internal cylinder part 53 , an internal spring part 54 , and an inflow ball part 55 . can do.

The inlet external cylinder part 51 is fixedly installed inside the housing part 10 , and a space for storing oil and inserting the pressing part 40 may be formed. A cylinder hole 511 for discharging oil may be formed in the inlet external cylinder part 51 . The external spring part 52 is built in the inflow external cylinder part 51 to elastically support the inflow internal cylinder part 53 .

The inlet inner cylinder part 53 may be interlocked with the pressing part 40 and supported by the external spring part 52 . The inner spring part 54 may elastically support the inlet ball part 55 which is built in the inflow internal cylinder part 53 and opens and closes the flow path formed in the pressing part 40 .

The filter unit 60 is built into the housing unit 10 , is coupled to the inlet unit 50 , surrounds the piston unit 30 , and prevents foreign substances from entering the piston unit 30 . For example, the filter unit 60 may be coupled to the outside of the inlet external cylinder unit 51 and extend to surround the piston unit 30 .

The sealing part 70 is disposed between the inlet part 50 and the pressing part 40 to prevent leakage. For example, the sealing part 70 may be coupled to the outside of the pressing part 40 to be interlocked with the pressing part 40 , and may be in close contact with the inside of the inlet external cylinder part 51 .

The discharge part 80 is built into the housing part 10 and selectively allows the discharge of oil according to the pressure of the oil stored in the inlet part 50 . For example, the discharge unit 80 may include a discharge cap unit 81 , a discharge spring unit 82 , and a discharge ball unit 83 .

The discharge cap part 81 may be mounted on the housing part 10 , and an end may be formed to surround the end of the inlet external cylinder part 51 . At this time, the discharge cap part 81 and the inlet external cylinder part 51 are spaced apart so that the oil can move, and the orifice 84 is formed to attenuate the pulsation of the discharged oil.

The discharge spring part 82 is built into the discharge cap part 81 , and can elastically support the discharge ball part 83 for closing the cylinder hole part 511 .

4 is a view schematically showing a first embodiment of the pressing unit in the pump device for an electronically controlled brake system according to an embodiment of the present invention. 1 to 4 , the pressing unit 40 according to the first embodiment of the present invention includes a first pressing connection part 41 and a first compression inducing part 42 .

The first pressure connection part 41 is press-fitted to the piston part 30 . The first pressure connection part 41 includes a first connection insertion part 411 and a first connection rotation part 412 .

The first connection insertion part 411 is inserted into the first pressure groove part 31 formed at the end of the piston part 30 . As an example, when the outer diameter of the first connection insertion part 411 and the inner diameter of the first pressure groove part 31 are the same, the state in which the first connection insertion part 411 is press-fitted into the first pressure groove part 31 is coupled. can keep

The first connection rotation part 412 is extended from the first connection insertion part 411 , a spherical surface is formed, and is rotatably coupled in the first pressure induction part 42 . For example, the first connecting rotation unit 412 may be formed to be larger than a hemisphere and smaller than a sphere.

The first pressure connection part 41 may further include a first connection hole part 413 . The first connection hole 413 may pass through the central portions of the first connection insertion part 411 and the second connection rotation part 412 . Due to this, when the first pressure insertion part 411 is press-fitted into the first pressure groove part 31, air may be discharged to the outside.

The first pressure induction part 42 guides the oil to the inlet part 50 . The first pressure connecting portion 41 is rotatably coupled to the first pressure inducing portion 42 . The first pressure induction part 42 includes a first guide pipe part 421 and a first induction coupling part 422 .

The first guide pipe portion 421 has a stepped portion 425 formed on the outside and guides the oil. As an example, the first guide pipe part 421 has a hole formed in the center to guide the oil, and the outer diameter of the first locking jaw 4251 and the first locking jaw 4251 over which the sealing part 70 is spread on the outside. The small inlet inner cylinder part 53 may include a second locking protrusion 4252 over it.

A plurality of first induction coupling portions 422 are spaced apart from each other and protrude from the first guide tube portion 421 , and a spherical surface is formed inside, so that the first pressure connection portion 41 is surface-contacted. For example, four spaced apart first inductive coupling parts 422 protrude in the direction of the first pressure connection part 41 , and the first connection rotating part 412 is inserted into the first inductive coupling part 422 to be rotated. there is.

The first pressure induction portion 42 may further include a first guide groove portion 423 . The first guide groove portion 423 is formed at the end of the first guide pipe portion 421 to guide oil. For example, the first guide groove portion 423 may be formed between the first guide coupling portions 422 to guide the oil to a hole formed in the central portion of the first guide tube portion 421 .

5 is a view schematically showing a second embodiment of the pressing unit in the pump device for an electronically controlled brake system according to an embodiment of the present invention. Referring to FIG. 5 , the pressing unit 40 according to the second embodiment of the present invention includes a second pressing connecting part 43 and a second pressing inducing part 44 .

The second pressure connection part 43 is integrally formed with the piston part 30 and protrudes from the end of the piston part 30 to form a spherical surface. For example, the second pressure connection part 43 may be formed to be larger than a hemisphere and smaller than a sphere.

The second pressure induction part 44 is coupled to the second pressure connection part 43 so as to be rotatable, and guides the oil. For example, the second pressure induction unit 44 may be the same as the first pressure induction unit 42 of FIG. 4 .

6 is a view schematically showing a third embodiment of the pressing unit in the pump device for an electronically controlled brake system according to an embodiment of the present invention. Referring to FIG. 6 , the pressing part 40 according to the third embodiment of the present invention includes a third pressing connection part 45 and a third compression inducing part 46 .

The third pressure connection part 45 is integrally formed with the piston part 30 to form a spherical surface, and a third connection hole part 451 communicating with the third piston hole part 33 formed in the piston part 30 is formed. do. For example, the third pressure connection part 45 may be formed to protrude from the end of the piston part 30 and be larger than a hemisphere and smaller than a sphere. The oil may sequentially move through the third piston hole part 33 and the third connection hole part 451 .

The third pressure induction part 46 is inserted so that the third pressure connection part 45 is rotatable, and guides the oil to be moved to the third connection hole part 451 . For example, the third pressure induction part 46 has a tubular shape and a third guide pipe part 461 for guiding the oil, and the third pressure connection part 45 extending from the third guide pipe part 461 and having a spherical surface formed on the inside. ) may include a third inductive coupling portion 462 is inserted. At this time, the third inductive coupling part 462 may have a cut-out hole 466 for smooth insertion of the third inductive coupling part 462 . Meanwhile, the third guide pipe part 461 may correspond to the first guide pipe part 421 of FIG. 4 , and the oil passing through the third connection hole part 451 may be moved to the third guide pipe part 461 . .

7 is a view schematically showing a fourth embodiment of the pressing unit in the pump device for an electronically controlled brake system according to an embodiment of the present invention. Referring to FIG. 7 , the pressing part 40 according to the fourth embodiment of the present invention includes a fourth pressing connection part 47 and a fourth compression inducing part 48 .

The fourth pressure connection part 47 is inserted into the piston part 30 and is rotatably connected to the piston part 30 . A plurality of fourth pressure connection parts 47 are spaced apart to form a spherical surface on the outside, and are inserted into the fourth pressure groove portion 34 formed in the piston unit 30 . For example, the fourth compression connection part 47 may be inserted into the fourth compression groove part 34 having a shape larger than a hemisphere and smaller than a sphere to form a spherical surface.

The first pressure guide portion 48 extends from the fourth pressure connection portion 47, and guides the oil. The fourth pressure induction part 48 includes a fourth guide pipe part 481 , a fourth guide extension part 482 , and a fourth guide hole part 483 .

The fourth guide pipe portion 481 has a stepped portion formed on the outside and guides the oil. As an example, the fourth guide tube portion 481 may correspond to the first guide tube portion 421 of FIG. 4 , and a detailed description thereof will be omitted.

The fourth guide extension portion 482 extends from the fourth guide tube portion 481 , and a fourth pressure connection portion 47 is formed. For example, the fourth guide extension portion 482 is disposed between the first guide tube portion 481 and the fourth pressure connection portion 47, and these may be integrally formed.

The fourth guide hole portion 483 is formed in the fourth guide extension portion 482, communicates with the fourth guide pipe portion 481 to guide the oil. That is, the oil introduced into the fourth guide hole part 483 may be moved to the fourth guide pipe part 481 .

The operation of the pump device for an electronically controlled brake system according to an embodiment of the present invention having the above structure will be described as follows.

When the piston part 30 moves backward, the oil from which foreign substances are removed by the filter part 70 passes through the inside of the pressing part 40 and pushes the inlet ball part 55 to be stored in the inlet external cylinder part 51 . . The inflow ball part 55 closes the moving pipe part 413 by the restoring force of the internal spring part 54 when the oil inflow is completed.

When the motor cam part 20 is rotated and the piston part 30 is moved forward in a state where the oil is stored in the inflow external cylinder part 51, the pressing part 40 moves and the oil stored in the hydraulic external cylinder part 51 is moved. pressure rises; When the pressure of the oil stored in the hydraulic external cylinder part 51 rises, the discharge ball part 83 is pushed and discharged.

On the other hand, since the piston part 30 is linearly moved by friction with the motor cam part 20 , vertical flow may occur at the end of the piston part 30 when the piston part 30 linearly moves. At this time, since the pressing part 40 moves linearly while allowing vertical flow, that is, rotation of the piston part 30 , damage to the sealing part 70 can be prevented.

That is, in the first embodiment of the pressing unit 40 , the piston unit 30 and the first pressure connection unit 41 press-fitted are rotatably coupled to the first pressure induction unit 42 so that the piston unit 30 rotates itself. Even if it is, the first pressure induction unit 42 can only move in a straight line.

And, in the second embodiment of the pressing unit 40, the second pressure connecting portion 43 integrally formed with the piston unit 30 is rotatably coupled to the second pressure inducing unit 44, so that the piston unit 30 is Even if it rotates by itself, the second pressure induction unit 44 can only move in a straight line.

In addition, in the third embodiment of the pressing unit 40 , the third pressure connecting portion 45 integrally formed with the piston unit 30 is rotatably coupled to the third pressure inducing unit 46 to form the piston unit 30 . Even if it rotates by itself, the third pressure induction unit 46 can only move in a straight line.

Finally, in the fourth embodiment of the pressing unit 40 , the fourth pressure connection part 47 and the fourth pressure induction part 48 are integrally formed, and the fourth pressure connection part 47 rotates on the piston part 30 . Since it is coupled so as to be possible, even if the piston part 30 is rotated by itself, the fourth pressure induction part 48 can only move in a straight line.

In the pump device 1 for an electronically controlled brake system according to an embodiment of the present invention, since the pressing part 40 coupled to the piston part 30 moves linearly while allowing the up and down flow of the piston part 30, the sealing part (70) By preventing damage, it is possible to improve durability.

In the pump device 1 for an electronically controlled brake system according to an embodiment of the present invention, the first pressure connection part 41 is press-fitted to the piston part 30, and is rotatably coupled to the first pressure induction part 42 to make the first 1 It is possible to induce linear movement of the pressure inducing unit (42).

In the pump device 1 for an electronically controlled brake system according to an embodiment of the present invention, the second pressure connection part 43 is integrally formed with the piston part 30 and is rotatably coupled to the second pressure induction part 44 . It is possible to induce linear movement of the second pressure inducing unit 44 .

In the pump device 1 for an electronically controlled brake system according to an embodiment of the present invention, the third pressure connection part 45 is integrally formed with the piston part 30 and is rotatably coupled to the third pressure guide part 46 . It is possible to induce a linear movement of the third pressure inducing unit (46).

In the pump device 1 for an electronically controlled brake system according to an embodiment of the present invention, the fourth pressure connection part 47 and the fourth pressure induction part 48 are integrally formed, and the fourth pressure connection part 47 and the piston part 30 is rotatably coupled to induce linear movement of the fourth pressure inducing unit 48 .

Although the present invention has been described with reference to the embodiment shown in the drawings, this is merely exemplary, and it is understood that various modifications and equivalent other embodiments are possible by those of ordinary skill in the art. will understand Accordingly, the true technical protection scope of the present invention should be defined by the following claims.

10: housing unit 20: motor cam unit
30: piston part 40: pressure part
41: first pressure connection part 42: first pressure induction part
43: second pressure connection part 44: second pressure induction part
45: third pressure connection part 46: third pressure induction part
47: fourth pressure connection part 48: fourth pressure induction part
50: inlet 60: filter unit
70: sealing part 80: discharge part

Claims (10)

housing unit;
a motor cam unit mounted to the housing unit;
a piston part embedded in the housing part and moved by friction with the motor cam part;
a pressing part connected to the piston part to guide the oil, and allowing the piston part to flow up and down;
an inlet part embedded in the housing part, into which the pressing part is inserted, and storing oil supplied through the pressing part;
a filter part embedded in the housing part, coupled to the inlet part, surrounding the piston part, and preventing foreign substances from being introduced into the piston part;
a sealing part disposed between the inlet part and the pressing part to prevent leakage; and
It includes a; is built in the housing unit, and selectively permits the discharge of oil according to the pressure of the oil stored in the inlet;
the pressure part
a first pressure connection part press-fitted to the piston part; and
The first pressure connecting portion is rotatably coupled, and a first pressure inducing portion for guiding the oil; includes,
The first pressure connection part
a first connection insertion part inserted into the first pressure groove part formed in the piston part; and
and a first connection rotation part extending from the first connection insertion part and having a spherical surface that is rotatable in the first pressure induction part.
delete delete According to claim 1, wherein the first pressure inducing unit
A step portion is formed on the outside and a first guide pipe portion for guiding the oil; and
and a plurality of first induction coupling portions protruding apart from the first guide tube portion and having a spherical surface formed therein so that the first pressure connection portion is in surface contact.
5. The method of claim 4, wherein the first pressure induction unit
and a first guide groove formed at an end of the first guide pipe to guide oil.
delete delete housing unit;
a motor cam unit mounted to the housing unit;
a piston part embedded in the housing part and moved by friction with the motor cam part;
a pressing part connected to the piston part to guide the oil, and allowing the piston part to flow up and down;
an inlet part embedded in the housing part, into which the pressing part is inserted, and storing oil supplied through the pressing part;
a filter part embedded in the housing part, coupled to the inlet part, surrounding the piston part, and preventing foreign substances from being introduced into the piston part;
a sealing part disposed between the inlet part and the pressing part to prevent leakage; and
It includes a; is built in the housing unit, and selectively permits the discharge of oil according to the pressure of the oil stored in the inlet;
the pressure part
a fourth pressure connection part inserted into the piston part and rotatably connected to the piston part; and
and a fourth pressure induction part extending from the fourth pressure connection part and guiding oil.
9. The method of claim 8, wherein the fourth pressure connection portion
A pump device for an electronically controlled brake system, characterized in that a plurality of spherical surfaces are spaced apart from each other, and are inserted into a fourth pressure groove formed in the piston part.
The method of claim 8, wherein the fourth pressure inducing unit
a fourth guide pipe part having a stepped portion formed on the outside and guiding the oil;
a fourth induction extension portion extending from the fourth guide tube portion and forming the fourth pressure connection portion; and
and a fourth guide hole formed in the fourth guide extension part and communicating with the fourth guide pipe part to guide oil.

Images