KR102085063B1 - Piston pump for brake system of vehicles - Google Patents

Abstract

The pump piston includes a sleeve housing having a discharge hole and forming a bore, an inlet flow path for introducing oil into the bore, and a piston inserted into the bore so as to be reciprocally moved. An inlet valve installed to open and close, a discharge valve cover fastened to the sleeve housing to surround a portion in which the discharge hole is formed, a discharge valve installed to open and close the discharge hole, and between the sleeve housing and the piston It includes a press-in stopper.

Description

Piston pump for brake system of vehicles

The present invention relates to a piston pump for supplying hydraulic pressure used in a brake system for controlling the attitude of a vehicle.

The piston pump used for the operation of the brake system of the vehicle, in particular the brake system for the vehicle posture, such as the anti-lock brake system (ABS), functions to control the pressure in the wheel brake cylinder.

Conventional piston pumps used in vehicle brake systems include a sleeve housing and a piston inserted therein for linear reciprocating movement, and an inlet valve for inflow and discharge of hydraulic pressure by reciprocating movement of the piston. valve and outlet valve, respectively. At this time, the piston is configured to make a linear reciprocating motion by the rotational motion of the rotating shaft rotated by the drive motor, for example, the piston is configured to make a linear reciprocating motion by the eccentric rotational motion of the eccentric spindle rotating with the rotating shaft. Can be. Oil is introduced and discharged in the process of opening and closing the inlet valve and the outlet valve by the reciprocating motion of the piston by rotation of the eccentric spindle and elastic restoring force of the elastic member.

An oil filter for filtering impurities of oil flowing into the inflow passage of the piston in the piston pump is provided. At this time, the oil filter has a tubular shape and the front end of the sleeve housing is assembled in a state of being inserted into the opening of the oil filter, wherein the inner circumferential surface of the oil filter facing each other to improve the assembly as in Korea Patent Publication No. 10-2009-0014306 Undercuts are formed on the outer circumferential surfaces of the sleeve housing and the sleeve housing, respectively, so that assembly and fastening are maintained. In the case of fastening in this manner, the undercut must be processed on the oil filter and the sleeve housing, respectively, and the manufacturing process of the parts is not only complicated, but also there is a problem that the fastening of both is difficult to maintain after assembly.

United States Patent US6,334,762 registered on 01/01/2002 Korean Laid-Open Patent Publication No. 10-2009-0014306 (Published: February 09, 2009) Korean Laid-Open Patent Publication No. 10-2014-0104104 (Published: August 28, 2014)

The problem to be solved by the present invention is to provide a piston pump that is easy to manufacture.

The pump piston according to the embodiment of the present invention has a sleeve housing having a discharge hole and forming a bore, an inlet flow path for introducing oil into the bore, and is inserted into the bore so as to be reciprocally moved. A piston, an inlet valve installed to open and close the inflow passage, a discharge valve cover fastened to the sleeve housing to surround a portion in which the discharge hole is formed, a discharge valve installed to open and close the discharge hole, and the And a stopper press-fitted between the sleeve housing and the piston for preassembly of the piston and the sleeve housing.

The pump piston according to the embodiment of the present invention may further include an oil filter installed in the piston to filter impurities of oil introduced into the inflow passage. The stopper is a ring-shaped body disposed between the sleeve housing and an opposing face of the oil filter in a direction parallel to the longitudinal direction of the piston, and connected to the body and between an inner surface of the sleeve housing and an outer surface of the piston. It may include a plurality of indentation legs press-fit in the space of the.

The press-fit leg may extend in a direction parallel to the longitudinal direction of the piston at the inner end of the body.

According to the present invention, since the stopper is press-fitted between the sleeve housing and the piston, there is no need to form an undercut in the sleeve housing and the oil filter as in the prior art, thereby facilitating the manufacture of the pump piston.

1 is a side view of a piston pump according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view taken along the line II-II of FIG. 1.
3 is a cross-sectional perspective view taken along the line II-II of FIG. 1.
4 is a perspective view of a stopper in accordance with an embodiment of the present invention.
5 is a cross-sectional view taken along the line VV of FIG. 4.

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

The piston pump according to an embodiment of the present invention may be used as part of an apparatus for adjusting oil pressure for operating a brake system of a vehicle, and may be supplied with oil discharged from a master cylinder of a vehicle to receive a wheel cylinder. to the cylinder). The apparatus for regulating oil pressure may include a plurality of solenoid valves, an accumulator, a motor, etc., in addition to the piston pump according to the embodiment of the present invention, such a piston pump, a solenoid valve, Accumulators, motors, etc. may be disposed within a modulator block.

The piston pump according to an embodiment of the present invention may be arranged in a bore formed in the modulator block. In this case, an inflow port and a discharge port, which are passages through which oil is supplied or discharged through the bore, may be provided, and the oil introduced through the inflow port passes through the piston pump according to an embodiment of the present invention and then discharged through the discharge port. Can be configured.

1 to 3, a sleeve housing 10 and a piston 20 are provided.

The sleeve housing 10 has a bore 11. At this time, one side of the sleeve housing 10 is open and the other side is provided with a discharge hole 12 through which oil passes.

The piston 20 is inserted into the bore 11 of the sleeve housing 10 so as to reciprocate. Specifically, the piston 20 is arranged to be reciprocated in a state where the tip portion is inserted into the bore 11. As shown in FIGS. 2 and 3, the sleeve housing 10 is opened on the opposite side where the discharge hole 12 is formed, and the front end of the piston 20 is opened through the open space of the sleeve housing 10 ( 11) is inserted. At this time, although not shown in the figure, the piston 20 contacts the eccentric spindle driven by a motor (not shown) opposite the end inserted into the bore 11 of the sleeve housing 10. It can be arranged so that the movement of the piston 20 is caused by the rotation of the eccentric spindle. And a coil spring 70 for elastically supporting the piston 20 with respect to the sleeve housing 10 is provided. The piston 20 is pushed towards the discharge hole 12 in the position of FIGS. 2 and 3 by the eccentric spindle, and is returned to the position shown in FIGS. 2 and 3 by the coil spring 70. That is, the reciprocating motion of the piston 20 is made by the rotation of the eccentric spindle and the elastic restoring force of the coil spring 20.

2 and 3, a sealing member 22 for sealing between the piston 20 and the sleeve housing 10 may be provided, and the piston 20 and the eccentric spindle may be disposed. A sealing member 23 may be provided for sealing between the parts. As shown in the figure, the sealing member indicated by reference numeral 22 can be supported on the piston 20 by the coil spring 70 together with the retainer 52 of the inlet valve 50 which will be described later. have. On the other hand, the sealing member indicated by 23 may be supported by a separate support member 25. The sealing members 22, 23 and the supporting member 25 may have a ring shape.

An inflow passage 21 for introducing oil is provided in the piston 20. As shown in the drawing, the inflow passage 21 is a radial passage 21b extending radially inward from the outer circumferential surface of the piston 20 and a longitudinal passage 21a extending in the longitudinal direction of the piston 20. It may be configured, the radial flow path (21b) may be provided in plurality. The inner end of the radial flow path 21b communicates with the longitudinal flow path 21a. In this case, an oil filter 30 may be provided at a portion where the radial flow path 21b is formed. The oil filter 30 may include a plurality of through holes 31, and after the oil of the inlet port (not shown) formed in the modulator block (not shown) passes through the oil filter 30, the radial flow path ( 21b).

The space between the sleeve housing 10 and the piston 20 as described above acts as a compression chamber 40. That is, the space between the sleeve housing 10 and the piston 20 is a compression chamber 40 for compressing the oil, the oil is introduced into the compression chamber 40 through the inflow passage 21 of the piston 20 It is discharged from the compression chamber 40 through the discharge hole 12.

An inlet valve 50 for regulating oil inflow into the compression chamber 40 and a discharge valve 60 for regulating oil discharge from the compression chamber 40 are provided. The inflow valve 50 regulates oil inflow by selectively opening and closing the inflow passage 21 of the piston 20, and the discharge valve 60 selectively opens and closes the discharge hole 12 of the sleeve housing 10. Adjust the emissions.

Inlet valve 50 may be implemented as a ball-poppet valve. For example, as shown in Figs. 2 and 3, the inlet valve 50 is a ball (51) for opening or closing the inlet flow path (21), the coil for elastically supporting the ball 51 It may include a spring (52), and a retainer (53) for supporting the coil spring (52). The retainer 53 may include a body portion 53a supporting the coil spring 52 and a plurality of leg portions 53b extending from an outer end of the body portion 53a. At this time, the support portion 53c extending radially outward from the end of the leg portion 53b may be provided, the support portion 53c is placed in close contact with the piston 20 again and the coil spring 70 described above. By supporting this supporting portion 53c, the retainer 53 is elastically supported by the coil spring 70 together with the piston 20.

When the ball 51 of the intake valve 50 is in the position shown in Figs. 2 and 3, the inflow passage 21 is closed. Meanwhile, when the piston 20 moves toward the discharge hole 12 in the state of FIGS. 2 and 3, the coil spring 70 is compressed and the inlet valve 50 also moves toward the discharge hole 12. When the eccentric spindle is further rotated in such a state that the force pushing the piston 20 is removed, the piston 20 returns to the position of FIGS. 2 and 3 by the restoring force of the coil spring 70, and in this process, the ball 51 As the return of the piston is later than the return of the piston 20, the ball 51 and the piston 20 are momentarily spaced apart to open the inflow passage 21. In addition, while the piston 20 moves toward the discharge hole 12, the oil in the compression chamber 40 is pressurized while being discharged through the discharge hole 12, while the ball 51 is separated from the piston 20. The oil flows into the compression chamber 40 through the inflow passage 21.

The discharge valve 60 regulates oil discharge through the discharge hole 12 by selectively opening and closing the discharge hole 12.

Discharge valve 60 may be implemented as a ball-poppet valve. For example, as shown in FIGS. 2 and 3, the discharge valve 60 provides a ball 61 for opening or closing the discharge hole 12, and an elastic support for the ball 61. It may include a coil spring (62). At this time, a cover 80 for securing a space in which the discharge valve 60 is installed is fastened to the sleeve housing 10. The cover 80 is fastened to the sleeve housing 10 so as to surround the portion where the discharge hole 12 is formed, as shown in FIGS. 2 and 3. As a result, a space is formed between the sleeve housing 10 and the cover 80, and the discharge valve 60 is disposed in the space between the sleeve housing 10 and the cover 80.

A discharge chamber 90 in which oil discharged between the sleeve housing 10 and the cover 80 is stored is formed. The oil discharged through the discharge hole 12 is discharged through the discharge port formed in the modulator block (not shown) via the discharge chamber 90. At this time, an oil discharge passage 91 for discharging the oil in the discharge chamber 90 to a discharge port (not shown) is formed. For example, the oil discharge passage 91 may be implemented with a groove formed on the inner surface of the cover 80.

2 and 3 show a state in which the ball 61 of the discharge valve 60 is closing the discharge hole 12, the ball in the compression chamber 40 in the state of Figs. As the 61 is pushed away from the sleeve housing 10, the discharge hole 12 is opened.

Meanwhile, according to the embodiment of the present invention, the stopper 100 is press-fitted between the sleeve housing 10 and the piston 20. Specifically, as shown in FIGS. 4 and 5, the stopper 100 includes a ring-shaped body 101 and a plurality of indentation legs 103 connected thereto. In this case, four indentation legs 103 are illustrated as being provided, but the number of indentation legs 103 is not limited thereto. 4 and 5, the press-fit leg 103 may extend in a direction parallel to the longitudinal direction of the piston 20 on the inner circumferential surface of the body 101.

The body 101 is disposed between the facing surfaces of the sleeve housing 10 and the oil filter 30 as shown in FIGS. 2 and 3. At this time, the surfaces facing each other of the sleeve housing 10 and the oil filter 30 means the surfaces facing each other along the direction parallel to the longitudinal direction (up and down direction in Figure 2) of the piston 20. As a result, the body 101 performs a stop function between the sleeve housing 10 and the oil filter 30.

On the other hand, the press-fit leg 103 is press-fit into the space between the inner circumferential surface of the sleeve housing 10 and the outer circumferential surface of the piston 20. In this case, the press fitting leg 103 filling only a part of the space between the inner circumferential surface of the sleeve housing 10 and the outer circumferential surface of the piston 20 is provided, whereby the contact area is reduced during press-fitting, thereby making press-fitting easier.

At this time, as shown in Figures 2 and 3, the end of the press-fit leg 103 of the stopper 100 may be arranged to face apart from the locking jaw 24 of the piston 20 by a predetermined distance. When the piston 20 is moved backwards by a certain distance, the locking jaw 24 of the piston 20 hits the press-fit leg 103, thereby implementing the stop function of the piston 20.

According to an embodiment of the present invention, the pump piston 20 may be preassembled in an assembly form with the sleeve housing 10 by the stopper 100 before being assembled to the modulator block. In addition, the application of the stopper 100 does not require the undercut of the sleeve housing 10 and the oil filter 30, so that the shape can be simplified, thereby making it possible to manufacture by the forging method.

Although the embodiments of the present invention have been described above, the scope of the present invention is not limited thereto, and the present invention is easily changed and equally recognized by those skilled in the art to which the present invention pertains. It includes all changes and modifications to the scope that comes.

10: sleeve housing
11: bore
12: discharge hole
20: piston
70: coil spring
21: Inflow Euro
22, 23: sealing member
24: hanging jaw
25: support member
30: oil filter
40: compression chamber
50: inlet valve
60: discharge valve
80: cover
90: discharge chamber
91: oil discharge flow path
100: stopper
101: body
103: indentation leg

Claims (3)

A sleeve housing having a discharge hole and forming a bore,
A piston having an inflow passage for introducing oil into the bore and inserted into the bore so as to reciprocate;
An oil filter installed in the piston to filter impurities of oil flowing into the inflow passage;
An inlet valve installed to open and close the inflow passage,
A discharge valve cover fastened to the sleeve housing so as to surround a portion where the discharge hole is formed;
A discharge valve installed to open and close the discharge hole, and
A stopper press-fitted between the sleeve housing and the piston for preassembly of the piston and the sleeve housing,
The stopper
A ring-shaped body disposed between the sleeve housing and the opposing face of the oil filter in a direction parallel to the longitudinal direction of the piston, and
A plurality of press-fit legs connected to the body and press-fitted into a space between an inner surface of the sleeve housing and an outer surface of the piston;
Piston pump. delete In claim 1,
The indentation leg is a piston pump which is formed extending in a direction parallel to the longitudinal direction of the piston at the inner end of the body.

Images