KR102225784B1 - Pump for brake system - Google Patents

Abstract

A pump for a brake system is disclosed. In the pump for a brake system according to an embodiment of the present invention, in 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 forming an inner chamber for pressurizing a fluid, and a cylinder It is provided as a penetration through which one end is coupled with the valve seat and the other end receives a piston that reciprocates linearly inside the modulator block bore, and provides internal and external communication so that the fluid leaking through the other end of the piston can be re-introduced into the suction port. And a sleeve having a hole.

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 capable of improving the efficiency and durability of the pump.

In general, a brake system installed in a vehicle is equipped with ABS, ESC, EHB, and the like, and the brake system controls the brake hydraulic pressure of the vehicle to ensure the driving stability of the vehicle.

Conventional brake systems include multiple solenoid valves, low-pressure accumulators and high-pressure accumulators that temporarily store oil from hydraulic brakes, motors and pumps for pumping oil temporarily stored in low-pressure accumulators, and solenoid valves and motor drive control. It includes an electronic control unit (ECU), and these components are built into a modulator block made of aluminum.

Among them, the pump plays a role of regulating the hydraulic pressure supplied to the wheel cylinder of the brake, and Korean Patent Publication No. 2011-0125134 discloses a hydraulic pump for a brake system for regulating the hydraulic pressure.

Korean Patent Publication No. 2011-0125134 (2011.11.18.)

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

According to an aspect of the present invention, in 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 forming an inner chamber for pressurizing a fluid, and a cylindrically formed one end It is coupled to the valve seat, and the other end has a through hole provided to communicate with the inside and the outside so that the other end receives a piston inside the modulator block bore that reciprocates linearly, and the fluid leaking to the other end of the piston can be re-introduced into the suction port. A pump for a brake system comprising a sleeve may be provided.

In addition, the piston is disposed to contact the eccentric spindle of the motor through the open one end of the modulator block bore, the valve seat is provided at the open other end of the modulator block bore, and a fluid between the piston and the valve seat A return spring may be provided to return the piston moved to pressurize.

In addition, the sleeve may include a large-diameter portion and a small-diameter portion, and the through hole may be provided in a small-diameter portion.

In addition, the piston may include a seal, and the through hole may be provided closer to the eccentric spindle side of the motor than the seal.

In addition, the valve seat may include a suction passage in communication with the suction port and a discharge passage in communication with the discharge port, and may be provided so as to be orthogonal to the suction passage and the discharge passage.

The pump for a brake system according to an embodiment of the present invention provides a through hole in a sleeve accommodating the piston so that the fluid leaking to the piston is re-introduced to the suction port side through the space between the sleeve and the modulator block bore and circulated. The efficiency of the pump can be increased due to the increase, and further, the durability of the pump can be increased by preventing fluid from leaking to the motor driving bearing side.

1 is a cross-sectional view showing a pump for a brake system according to an embodiment of the present invention.
2 is a partially enlarged view of FIG. 1.

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 being limited to their usual or dictionary meanings, and the inventors appropriately explain the concept of terms in order to explain their own invention in the best way. Based on the principle that it can be defined, it should be interpreted as a meaning and concept consistent with the technical idea of the present invention. Accordingly, the embodiments described in the present specification and the configurations shown in the drawings are only the most preferred embodiment of the present invention, and do not represent all the technical spirit of the present invention. It should be understood that there may be equivalents and variations.

1 is a view showing a pump for a brake system according to an embodiment of the present invention, and FIG. 2 is an enlarged view of FIG. 1.

Referring to the drawings, the pump 100 for a brake system according to the present embodiment includes a bore 112 formed in the modulator block 110 to communicate with the suction port 111 and the discharge port 113, and the opening of the bore 112 The piston 120 is arranged to be in contact with the eccentric spindle 10 of the motor through one end and is arranged to enable a linear reciprocating motion in the bore 112, and the other end of the bore 112, which is the opposite side of the piston 120, It includes a valve seat 130 provided to form a chamber for pressurizing the fluid.

Inside the valve seat 130, there is a suction passage 132 for communicating with the suction port 111 to introduce the fluid at the suction port side into the inner chamber, and a discharge port for the fluid pressurized in the inner chamber by the piston 120. A discharge passage 134 for guiding toward the discharge port in communication with the discharge port 113 is formed.

The suction passage 132 is provided by penetrating the valve seat 130 in the transverse direction, and the discharge passage 134 is provided through the valve seat 130 in the longitudinal direction. The valve seat 130 pressurizes the fluid through the inner chamber formed by the two flow paths 132 and 134 that are orthogonal to each other.

A pump cap 140 for blocking the inside of the bore 112 from the outside is coupled to the open other end of the bore 112, and discharged through a discharge passage 134 between the pump cap 140 and the valve seat 130 A guide passage 142 for guiding the fluid to be discharged toward the discharge port 113 is provided.

A suction valve 150 is installed at the side end of the valve seat 130 to open and close the suction passage 132 provided in the valve seat 130 in the transverse direction. The suction valve 150 includes a suction ball 152 provided as an opening/closing member for opening and closing the suction passage 132 and a support spring 154 elastically supporting the suction ball 152 toward the suction port 111. In order to facilitate the installation of the suction valve 150, the suction passage 132 passing through the valve seat has an inner diameter enlarged from one side (suction port side) to the other side, and the suction ball 152 and the support spring 154 are After insertion, the valve cap 156 is coupled to form a suction passage 132.

A discharge valve 160 is installed at an upper end of the valve seat 130 to open and close the discharge passage 134 provided in the valve seat 130 in the longitudinal direction. The discharge valve 160 includes a discharge ball 162 provided as an opening/closing member for opening and closing the discharge passage 134 and a support spring 164 elastically supporting the discharge ball 162 toward the discharge passage 134. The discharge valve 160 is fixed by a pump cap 140 provided at a distal end of the valve seat 130 on the discharge passage side. The pump cap 140 and the valve seat 130 may be coupled by pressing, welding, or the like.

Meanwhile, between the valve seat 130 and the piston 120, a return spring 170 for elastically supporting the piston 120 toward the eccentric spindle 10 is installed in order to return the piston 120 moved to pressurize the fluid. .

The return spring 170 and the piston 120 are accommodated in the cylindrical sleeve 180 and assembled with the valve seat 130. The sleeve 180 includes a large-diameter portion 182 coupled to the valve seat 130 and a small-diameter portion 184 that supports the piston 120 so that it can linearly reciprocate. The piston 120 is assembled from the large-diameter portion 182 side including the piston head 122 having a larger diameter than the body, and by providing a neck on the body corresponding to the small-diameter portion 184 and arranging the seal 124, the fluid It suppresses the slipping out between the sleeve 180 and the piston 120.

At least one or more through holes 186 are provided in the small-diameter portion 184 of the sleeve 180. Due to the seal 124, the amount of fluid that escapes between the sleeve 180 and the piston 120 can be reduced to some extent, but it is difficult to completely remove it, and the fluid leaking through the piston enters the motor drive bearing side, thereby improving the durability of the motor. It can weaken. In this embodiment, a through hole 186 is provided in the sleeve 180 so that the inside and the outside communicate with each other, so that the fluid leaking through the piston passes through the space between the sleeve 180 and the bore 112 to the suction port 111. Let it flow in.

The pump 100 according to the present embodiment has improved processing convenience by arranging the suction passage 132 and the discharge passage 134 provided in the valve seat 130 so as to be orthogonal, and the length of the passage is relatively short compared to the prior art. It can improve the suction and discharge speed of the fluid while losing. In addition, the productivity of the pump can be further improved by providing the suction ball 152 and the discharge ball 162, which are opening and closing members of the suction valve and the discharge valve, in the same shape.

In addition, in the pump 100 according to the present embodiment, the pump cap 140 is coupled to the upper end of the valve seat 130, and the sleeve 180 accommodating the piston 120 is coupled to the lower end of the pump. Since it can be assembled into a finished module, manufacturing efficiency can be improved.

In the pump 100 for a brake system provided as described above, the piston 120 linearly reciprocates as the eccentric spindle 10 of the motor rotates, and accordingly, the suction valve ( While 150 and the discharge valve 160 operate opposite to each other, the fluid at the suction port 111 is pressurized and pumped to the discharge port 113.

That is, when the piston 120 moves toward the pump cap 140 through the rotational motion of the motor spindle 10, the fluid pressure in the inner chamber of the valve seat 130 increases, so that the suction valve 150 is closed and the discharge valve ( 160) is open. Therefore, the fluid pressurized in the inner chamber of the valve seat 130 is pumped through the discharge port 113.

On the other hand, when the piston 120 moves toward the motor, a low pressure is formed in the inner chamber of the valve seat 130 and the suction valve 150 is opened and the discharge valve 160 is closed. Accordingly, at this time, the fluid flowing into the suction passage 132 through the suction port 111 is filled in the inner pamber of the valve seat 130.

In this state, when the piston 120 moves toward the pump cap 140 by the spindle 10 again, the fluid in the inner chamber of the valve seat 130 is pressurized and moves toward the discharge port 113. The fluid pumping operation of such a pump is continuously performed through repetition of the above-described process (refer to the solid line in FIG. 1).

On the other hand, the fluid pumping operation of the pump, in particular, the fluid leaking to the motor side through the piston 120 and the sleeve 180 during the discharge operation, as shown by the dotted line in FIG. It flows out into the space between the sleeve 180 and the bore 112 through the through hole 186 provided adjacent to the eccentric spindle side of the pump, and may be re-introduced into the suction port 111 and circulated during the suction operation of the pump.

10..motor eccentric spindle 100..pump
110..Modulator block 111..Suction port
112..bore 113..discharge port
120..piston 124..seal
130..Valve seat 140..Pump cap
150..suction valve 160.. discharge valve
170..return spring 180..sleeve
186..through hole

Claims (5)

In the brake system pump provided in the bore of the modulator block in communication with the suction port and the discharge port,
A valve seat comprising a suction passage in communication with the suction port and a discharge passage in communication with the discharge port, and forming an inner chamber for pressurizing a fluid;
A sleeve provided in a cylindrical shape, one end coupled with the valve seat, the other end receiving a piston inside the bore of the modulator block and having a through hole provided to communicate with the inside; And
Includes; a pump cap coupled to the valve seat and provided to block the inside of the bore from the outside,
A space connected to the suction passage is formed between the sleeve and the bore,
A pump for a brake system provided to allow fluid leaking between the piston and the sleeve to flow into the suction passage through the space. The method of claim 1,
The sleeve includes a large diameter portion and a small diameter portion,
The through hole is a pump for a brake system provided in a small diameter portion. The method of claim 1,
The piston comprises a seal,
The through hole is a brake system pump provided adjacent to the eccentric spindle side of the motor than the seal. The method of claim 1,
A pump for a brake system provided so as to be orthogonal to the suction passage and the discharge passage. The method of claim 1,
Further comprising a suction valve installed on the valve seat to open and close the suction passage according to the operation of the piston,
The suction valve,
A suction ball for opening and closing one side of a suction passage passing through a side surface of the valve seat;
A support spring elastically supporting the suction ball toward the suction port; And
A pump for a brake system comprising a; valve cap coupled to the valve seat to close the other side of the suction passage and supporting the support spring.

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