KR101782777B1 - Valve seat for piston pump and pump unit for electronic control brake system including the same - Google Patents

Abstract

A valve seat for a piston pump according to the present invention is a valve seat provided on the same shaft as a cap for a piston pump that seals an open end of a modulator block and has an orifice formed therein, And a valve seat for a piston pump in which a flow passage is formed.
Further, a pump unit for an electronically controlled brake system according to the present invention is a pump unit for an electronically controlled brake system, comprising a bore formed in a modulator block having an inlet port and a discharge port, the piston being reciprocably movable by the eccentric spindle of the motor, An inlet valve provided on the outlet side of the suction passage for opening and closing the suction passage, an outlet valve provided in the inlet portion of the discharge passage connected to the discharge port for opening and closing the suction passage, an outlet valve for opening and closing the orifice, And the bore is divided into a pressurizing chamber in which the piston is located and a discharge chamber communicating with the discharge port. The orifice is formed so that a flow path is formed on the outer surface against the cap for the piston pump Provided valve seat for piston pump To provide a pump unit for an electronically controlled brake system.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a valve seat for a piston pump, and a pump unit for an electronically controlled brake system including the valve seat.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve seat for a piston pump and a pump unit for an electronically controlled brake system including the valve seat. More particularly, the present invention improves the structure and manufacturing method of a valve seat for a piston pump, And a pump unit for an electronically controlled brake system including the valve seat.

Generally, an electronically controlled brake system installed in a vehicle controls the braking oil pressure applied to the wheel cylinder side intermittently, thereby preventing a wheel from slipping on the road surface, thereby performing a safe braking action.

In this electronically controlled brake system, a modulator block for interrupting the braking hydraulic pressure is provided in the middle of the hydraulic line connected to the wheel cylinder on the wheel side in the master cylinder, and a plurality of solenoid valves A low pressure accumulator and a high pressure accumulator provided on the upstream side and the downstream side of the hydraulic pump, respectively, and these devices are provided with a plurality of flow paths formed in the modulator block Lt; / RTI > Further, the operation of these devices for interrupting the braking hydraulic pressure is controlled by the electronic control device.

Among these devices, the low-pressure accumulator functions to temporarily store brake oil returning from the wheel cylinder on the wheel side and to supply the brake oil to the pump. The high-pressure accumulator temporarily stores the oil pressurized by the pump, So that the pressure pulsation is attenuated.

The high-pressure accumulator includes a hollow pressure chamber formed inside one side of the modulator block, a plug formed to cover an opening formed at one end of the pressure chamber, and a plug formed at the other end of the pressure chamber to allow fluid to flow into or out of the pressure chamber An inlet port and a discharge port, and an orifice is provided at an outer end of the discharge port for adjusting a flow rate of the fluid discharged from the pressure chamber. At this time, since the inlet port communicates with the outlet-side flow path of the pump and the discharge port communicates with the hydraulic line connected to the wheel side, the fluid pressurized and discharged from the pump flows into the pressure chamber through the inlet port, The fluid that has flowed into the chamber temporarily remains in the pressure chamber and is discharged through the discharge port after reducing the pressure pulsation of the pump.

As described above, in the conventional piston pump for a brake system, the discharge passage connected to the discharge port is usually formed by a press method in a piston pump cap, and therefore, further processing is required in the manufacturing of the cap, There is a problem that the manufacturing cost is expensive.

Open Patent Publication No. 10-2011-0125134 (published on November 18, 2011)

The present invention relates to a valve seat for a piston pump and an electronic device including the valve seat so as to improve the structure and manufacturing process of the valve seat for a piston pump and to improve productivity through cost reduction and simplification of the manufacturing process, It is an object of the present invention to provide a pump unit for a controlled brake system.

In order to solve the above problems, one aspect of the present invention is a valve seat provided with an orifice provided on the same axis as a cap for a piston pump that hermetically closes an open end of a modulator block, It is possible to provide a valve seat for a piston pump in which a flow path through which oil can flow is provided.

According to an aspect of the present invention, there is provided a valve seat for a piston pump having a shape depressed inwardly from the outside of the valve seat by a pressing method or a cutting process.

According to an aspect of the present invention, there is provided a valve seat for a piston pump, wherein the passage is formed at predetermined intervals along an outer surface of the valve seat.

According to an aspect of the present invention, there is provided a valve seat for a piston pump, wherein a diameter of an inner circumferential surface of the cap for the piston pump is formed to have a diameter corresponding to an outer diameter of the valve seat,

In accordance with another aspect of the present invention, there is provided a pump unit for an electronically controlled brake system, the pump unit comprising: an inhalation port communicating with the inflow port, the inhalation port communicating with the inflow port by a eccentric spindle of the motor inside a bore formed in a modulator block having an inflow port and a discharge port; An inlet valve provided at an inlet of a discharge passage connected to the discharge port and provided in the piston so as to open and close the orifice, an outlet valve provided on an outlet side of the suction passage for opening and closing the suction passage, A cap for a piston pump which hermetically closes the open end and supports the outlet valve and a piston which is connected to the piston at a predetermined interval by a piston spring and which divides the bore into a pressurizing chamber in which the piston is located and a discharge chamber communicating with the discharge port, Wherein the first, second, A pump unit for an electronically controlled brake system including the configuration according to any one of claims 4 to 10 can be provided.

According to an aspect of the present invention, there is provided a pump unit for an electronically controlled brake system, wherein a flow path formed in the valve seat for a piston pump is communicated with a discharge port.

The valve seat for a piston pump according to the present invention and the pump unit for an electronically controlled brake system including the valve seat according to the present invention can simplify the manufacturing process compared with the conventional manufacturing process, thereby reducing cost and improving productivity.

Further, since the shape of the cap can be simply made in a structure in which it is in contact with the valve seat and press-fitted into the outer wall and does not cause outflow to the outside, the ease of assembly can be ensured.

1 is a hydraulic circuit diagram showing the overall configuration of a conventional electronically controlled brake system.
Fig. 2 is an enlarged view of a valve seat according to the present invention and a sectional view of a piston pump equipped with the valve seat of the present invention, according to an embodiment of the present invention.
FIG. 3 is a perspective view showing a conventional valve seat, and FIG. 3 (b) is a perspective view showing a valve seat according to the present invention, in order to show the difference between the valve seat according to the present invention and a conventional valve seat.

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

The embodiments described below are provided by way of example so that those skilled in the art will be able to fully understand the spirit of the present invention. The present invention is not limited to the embodiments described below, but may be embodied in other forms. In order to clearly explain the present invention, parts not related to the description are omitted from the drawings, and the width, length, thickness, etc. of the components may be exaggerated for convenience. Like reference numerals designate like elements throughout the specification.

The electronically controlled brake system according to the present invention includes a plurality of brake cylinders (not shown) for intermittently controlling the braking hydraulic pressure generated in the master cylinder 10 to be transmitted to the wheel cylinders 20 provided on the front and rear wheels of the vehicle, A low pressure accumulator 50 for temporarily storing the oil returning from the wheel cylinder 20 and a pump 60 for pressurizing and recirculating the oil stored in the low pressure accumulator 50, Pressure accumulator 70 for reducing the pressure pulsation of the oil discharged from the high-pressure accumulator 60. The devices are compactly built in a rectangular parallelepiped modular block 80 made of aluminum, and a plurality of channels are formed inside the modular block 80 to connect the modules. Further, the operation of these devices for interrupting the braking hydraulic pressure is controlled by an electronic control device (not shown), and the master cylinder 10 is connected to a brake pedal 11 and a booster device 12 for generating booster.

The solenoid valves 30 and 40 are disposed on the upstream side of the wheel cylinder 20 and are provided with a normally open type solenoid valve 30 that is normally open and a plurality of solenoid valves 30 and 40 disposed on the downstream side of the wheel cylinder 20, And a normally closed type solenoid valve 40 which is provided to be opened and closed. The low pressure accumulator 50 is provided on the flow passage connecting the downstream side of the normally closed type solenoid valve 40 and the pump 60 so that when the pressure reducing braking action of the wheel cylinder 20 is performed, Type solenoid valve 40 to temporarily store the oil returning from the wheel cylinder 20. The high pressure accumulator 70 is disposed on the flow path connecting the discharge side of the pump 60 and the upstream side of the normal open type solenoid valve 30 to the damping chamber 70 for attenuating the pressure pulsation of the oil discharged from the pump 60. [ . A motor (90) is installed at one side of the pump (60) to drive the pump (60).

2 and 3, the pump unit 100 for an electronically controlled brake system according to the present invention includes a piston (not shown) installed to be reciprocally movable in a bore 112 formed in a modulator block 110, An inlet valve 130 provided at the outlet side of the suction passage 121 of the piston 120 for opening and closing the outlet of the suction passage 121 and an inlet valve 130 provided at the bore 112 to press the bore 112, A valve seat 150 partitioned into a chamber 115 and a discharge chamber 116 and an orifice 151 provided in the valve seat 150 to communicate the pressure chamber 115 and the discharge chamber 116 An outlet valve 140 provided in the discharge chamber 116 and a piston pump cap 200 for supporting the outlet valve 140.

The bore 112 of the modulator block 110 includes a suction port 111 communicating with the suction passage 121 and a pressure chamber provided downstream of the suction passage 121 and pressurized by the action of the piston 120 And the discharge chamber 116 is divided into a discharge chamber 116 communicating with the discharge port 113 and a discharge chamber 116 connected to the cap 200 coupled to the modulator block 110 Lt; / RTI > That is, the open end of the modulator block 110 is closed by the cap 200.

The piston 120 is reciprocated by an eccentric spindle 128 provided in a motor (not shown), and between the eccentric spindle 128 and the inlet port 111 and between the piston 120 and the valve seat 150, A sealing member 129 for sealing the sealing member 120 is provided. One end of the piston 120 on the downstream side of the suction passage 121 has a stepped shape so that the extended portion of the suction passage 121 is provided with the pressure chamber 115. At this time, the suction passage 121 formed in the piston 120 communicates the inlet port 111 and the pressure chamber 115, and the suction passage 121 is connected to an inlet valve 130 .

The inlet valve 130 includes a shielding member 131 for blocking the suction passage 121 and a valve spring for urging the shielding member 131 in contact with the downstream end of the suction passage 121 in the interior of the piston 120 And a retainer 133 coupled to the downstream end of the suction passage 121 for supporting the shield member 131 and the valve spring 132. [

The shielding member 131 closes the suction passage 121 by the elastic force of the valve spring 132. When the oil is discharged from the pressure chamber 115 and the pressure of the pressure chamber 115 drops, And the suction passage 121 is opened by the pressure difference between the chambers 115 and 115 from the suction passage 121.

The valve seat 150 is provided inside the bore 112 and divides the bore 112 into a pressure chamber 115 in which the piston 120 is located and a discharge chamber 116 in communication with the discharge port 113. An orifice 151 communicating the pressurizing chamber 115 and the discharge chamber 116 is provided at the downstream end of the valve seat 150. The orifice 151 is opened and closed by an outlet valve 140 provided in the discharge chamber 116.

2, the valve seat 150 supports the piston spring 125, which is installed in the modulator block 110 so as to surround the piston 120, to elastically support the piston 120. As shown in FIG. The piston spring 125 pushes the piston 120 toward the eccentric spindle 128 to reciprocate the piston 120 with the eccentric spindle 128.

The outlet valve 140 includes a shielding member 141 that closes the orifice 151 and a valve spring 142 that elastically supports the shielding member 141. The shielding member 141 closes the orifice 151 by the elastic force of the valve spring 142 and is pushed by the pressure of the oil when the oil in the pressure chamber 115 is pressed by the piston 120, And the orifice 151 is opened. The valve spring 142 is a coil spring whose one end is supported by the cap 200 to be described later and the other end is supported by the shielding member 141 to provide an elastic force to the shielding member 141. That is, the shielding member 141, which is pushed and released from the oil, is returned to its original position by the elastic force of the valve spring 142, thereby blocking the orifice 151.

A filter member 160 for filtering the oil flowing into the bore 112 through the inlet port 111 may be installed inside the bore 112 so as to surround the outer surface of the piston 120.

According to the present invention, the valve seat 150 is provided so as to be recessed therein so as to form the oil passage 152 by a method such as a pressing method or a cutting method. As shown in Figs. 2 and 3, grooves are provided with respect to the surface of the valve seat facing the cap, and the fluid can flow through the grooves. Therefore, the valve seat and the cap may be formed in contact with each other so as to prevent the outflow to the outside. That is, the outer diameter of the valve seat and the inner diameter of the cap have the same diameter. In addition, the flow path can be formed radially around the orifice and has a plurality of grooves, which serve as a flow path.

The pump unit 100 for an electronically controlled brake system as described above causes the piston 120 to linearly reciprocate as the eccentric spindle 128 of the motor (not shown) eccentrically rotates, The inlet valve 130 and the outlet valve 140 are opened and closed to oppose each other so that the oil is pumped to the high pressure accumulator (not shown) side.

That is, when the piston 120 moves to the outlet valve 140 side, the oil in the pressurizing chamber 115 is pressurized by the piston 120 to raise the oil pressure. As a result, the inlet valve 130 is closed, The oil is discharged through the orifice 151 along the oil passage 152 of the discharge chamber 116 or the valve seat 150 to be discharged to the discharge port 113 and pumped to the high pressure accumulator side.

On the other hand, when the piston 120 moves toward the eccentric spindle 128, a low pressure is formed in the pressurizing chamber 115, whereby the inlet valve 130 is opened and the outlet valve 140 is closed, The oil on the side of the master cylinder (not shown) or the master cylinder (not shown) is sucked into the pressure chamber 115 between the piston 120 and the outlet valve 140 through the suction port 111 and the suction passage 121. That is, this operation is repeated.

As a result, according to the present invention, the shape of the cap, which does not include the flow path, can be freed, thereby simplifying the process and reducing the cost.

100: pump unit 110: modulator block
111: inlet port 112: bore
113: Discharge port 120: Piston
121: Suction flow path 125: Piston spring
130: inlet valve 140: outlet valve
150: valve seat 151: orifice
152: channel 160: filter member
200: cap

Claims (6)

A cap sealing the open end of the modulator block to form a bore;
A valve seat dividing the bore into a pressurizing chamber and a discharge chamber and having an orifice connecting the pressurizing chamber and the discharge chamber; And
And a valve for opening and closing the orifice,
Wherein the valve seat includes a plurality of flow paths connecting the orifices and the discharge chambers. The method according to claim 1,
Wherein the plurality of flow paths are radially formed around the orifices. The method according to claim 1,
And the plurality of flow paths are formed on a surface facing the cap. The method according to claim 1,
Wherein the diameter of the inner circumferential surface of the cap is formed to have a diameter corresponding to the outer diameter of the valve seat, and is press-fitted to the cap. A pump unit for an electronically controlled brake system,
A piston which is reciprocably movable by the eccentric spindle of the motor inside the bore formed in the modulator block having the inlet port and the discharge port and has a suction flow path communicating with the inlet port;
An inlet valve provided on the piston at an outlet side of the suction passage for opening and closing the suction passage;
A valve seat provided in the bore and dividing the bore into a pressurizing chamber and a discharge chamber, the valve seat having an orifice connecting the pressurizing chamber and the discharge chamber;
An outlet valve provided at an inlet portion of a discharge passage connected to the discharge port and opening or closing the orifice; And
And a cap sealing the open end of the modulator block and supporting the outlet valve,
Wherein the valve seat includes a plurality of flow paths connecting the orifices and the discharge chambers. 6. The method of claim 5,
And the plurality of flow paths formed in the valve seat are in communication with the discharge ports.

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