KR102285423B1 - Orifice apparatus for brake control system - Google Patents

Abstract

An orifice device for a brake system is disclosed. An orifice device according to an embodiment of the present invention includes a body having an inlet through which brake oil discharged from a pump is introduced and an outlet through which brake oil is discharged, and is mounted to be slidably moved while supported by an elastic member in the body, and includes an inlet port. and a plunger having a plurality of orifices for communicating with the outlet, the plurality of orifices communicating with the inlet and the outlet when the plunger moves by the pressure of the oil introduced through the inlet and the first orifice for always communicating the inlet and the outlet It includes a second orifice provided to be able to do so.

Description

ORIFICE APPARATUS FOR BRAKE CONTROL SYSTEM

The present invention relates to an orifice device for a brake system, and more particularly, to an orifice device for a brake system capable of reducing pressure pulsation generated during operation of a pump.

A vehicle is necessarily equipped with a brake system for braking. Recently, various types of systems for obtaining a stronger and more stable braking force have been proposed.

Examples of the brake system include an anti-lock brake system (ABS) that prevents wheel slipping during braking, and a brake traction control system (BTCS: Brake) that prevents slipping of the driving wheels when the vehicle starts or accelerates rapidly. Traction Control System), and a Vehicle Dynamic Control System (VDC) that maintains the driving state of the vehicle stably by controlling the brake fluid pressure by combining the anti-lock brake system and traction control.

Such a brake system includes a master cylinder that generates pressure required for braking, a plurality of solenoid valves for controlling braking hydraulic pressure transmitted to the wheel brake of the vehicle, a low pressure accumulator for temporarily storing oil, and oil temporarily stored in the low pressure accumulator. It includes a pump and a motor for forced pumping, an orifice for reducing pressure pulsation of oil pumped from the pump, and an electronic control unit (ECU) for electrically controlling a solenoid valve and pump driving. . The valve assembly of the solenoid valve, the accumulator, the pump, and the motor are compactly installed in an aluminum hydraulic block (modulator block), and the electronic control device is equipped with the ECU housing with the coil assembly of the solenoid valve and the circuit board. is combined with

However, in the conventional brake system, a sudden pressure pulsation generated by driving the pump during the braking pressure increase process is reduced by an orifice provided on the discharge port side of the pump, but the conventional orifice has a limit in reducing the pressure pulsation.

Korea Registration Office No. 20-0267460 (2002.02.27)

Embodiments of the present invention are intended to provide an orifice for a brake system capable of exhibiting appropriate performance according to an operation mode of pressure pulsation of brake oil by a pump.

According to one aspect of the present invention, a body having an inlet through which the brake oil discharged from the pump is introduced and an outlet through which the brake oil is discharged, is mounted to be slidably moved in the body while supported by an elastic member, and the A plunger having a plurality of orifices communicating the inlet and the outlet, the plurality of orifices includes a first orifice for always communicating the inlet and the outlet, and when the plunger is moved by the pressure of the oil introduced through the inlet There may be provided an orifice device for a brake system including a second orifice provided to allow the inlet and the outlet to communicate with each other.

In addition, the plunger divides the first chamber in which the outlet is located and the second chamber in which the inlet is located in the body, but when the plunger does not move, a sealing part for sealing between the second orifice and the first chamber can be provided.

In addition, the body includes a casing that forms the first chamber therein and has an open side, and a stopper coupled to cover the open portion of the casing and forming the second chamber therein.

In addition, the end of the stopper may be provided with a sealing surface in a tapered shape to be in close contact with the sealing portion.

In addition, the plunger includes a long cylindrical plunger body, wherein the plunger body has a first portion positioned near the inlet port, and a groove forming the second orifice at a position spaced apart from the first portion. It includes a second part, a third part forming the sealing part, a fourth part supporting the elastic member and moving along an inner wall of the casing, and a fifth part to which the elastic member is mounted.

In addition, the second portion and the third portion may be formed with a slot cut in the longitudinal direction of the plunger body to form the first orifice.

In addition, the first part slides along the inner surface of the body, and the outer periphery of the first part may be provided with oil grooves arranged at predetermined intervals in the circumferential direction and recessed in the radial direction.

In addition, the oil groove may communicate the first chamber and the second chamber when the plunger is lowered to the maximum position by the pressure of the brake oil.

According to the embodiments of the present invention, the pressure pulsation of the brake oil discharged from the pump may allow the orifice to exhibit proper performance according to each operation mode.

1 is a hydraulic circuit diagram schematically illustrating a brake system according to an embodiment of the present invention.
2 is an exploded perspective view of an orifice device according to an embodiment of the present invention.
3 is a cross-sectional view of an orifice device according to an embodiment of the present invention.
4 is a perspective view illustrating a plunger of an orifice device according to an embodiment of the present invention.
FIG. 5 is a cross-sectional view taken along line II of FIG. 3 .
6 is a view illustrating a state in which the plunger of the orifice device according to an embodiment of the present invention is moved to an open position of the second orifice.
FIG. 7 is a cross-sectional view taken along line II-II of FIG. 6 .
8 is a diagram illustrating a flow of brake oil when the plunger is in an initial position according to an embodiment of the present invention.
9 is a view illustrating the flow of brake oil in a state in which the plunger moves a predetermined distance according to an embodiment of the present invention.
10 is a view illustrating a flow of brake oil in a state in which the plunger is lowered to the maximum position according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The embodiments introduced below are provided as examples in order to sufficiently convey the spirit of the present invention to those of ordinary skill in the art to which the present invention pertains. The present invention is not limited to the embodiments described below and may be embodied in other forms. In order to clearly explain the present invention, parts irrelevant to the description are omitted from the drawings, and in the drawings, the width, length, thickness, etc. of components may be exaggerated for convenience. Like reference numerals refer to like elements throughout.

1 is a hydraulic circuit diagram schematically showing a brake system according to an embodiment of the present invention.

Referring to FIG. 1 , the brake system according to the embodiment of the present invention uses a brake pedal 10 that receives a driver's operating force, and a pressure difference between vacuum pressure and atmospheric pressure by the pedal effort of the brake pedal 10. A brake booster 11 that doubles, a master cylinder 20 that generates pressure by the brake booster 11, a first port 21 of the master cylinder 20, and two wheels FR, RL The first hydraulic circuit 40A for controlling hydraulic pressure transmission by connecting the wheel cylinder 30 provided in the A second hydraulic circuit (40B) connected to (30) to control hydraulic pressure transmission is provided. The first hydraulic circuit 40A and the second hydraulic circuit 40B are compactly installed in the modulator block 40 .

The first hydraulic circuit 40A and the second hydraulic circuit 40B are each two solenoid valves 41 and 42 for controlling the brake hydraulic pressure transmitted to the wheel cylinder 30 side, and the driving of the motor 45 . A pump 44 that sucks and pumps brake oil from the wheel cylinder 30 or the brake oil from the master cylinder 20 by the (43), a main flow path (47a) connecting the discharge port of the pump (44) and the master cylinder (20), and an auxiliary flow path (47a) for guiding the brake oil of the master cylinder (20) to be sucked into the inlet of the pump (44) ( 48a), and an electronic control unit (ECU) for controlling the driving of the plurality of solenoid valves 41 and 42 and the motor 45 .

At this time, as shown, the solenoid valves 41 and 42, the low pressure accumulator 43, the pump 44, the main flow path 47a and the auxiliary flow path 48a are connected to the first and second hydraulic circuits 40A, 40B. are provided in each.

Specifically, the plurality of solenoid valves 41 and 42 are connected to the upstream and downstream sides of the wheel cylinder 30 , which are disposed on the upstream side of each wheel cylinder 30 and are normally open type maintained in an open state. It is divided into a solenoid valve 41 and a normally closed solenoid valve 42 disposed on the downstream side of each wheel cylinder 30 and maintained in a normally closed state. The opening/closing operation of these solenoid valves 41 and 42 can be controlled by an electronic control unit (not shown), and the normally closed solenoid valve 42 is opened according to the pressure reduction braking to be released from the wheel cylinder 30 side. Brake oil is temporarily stored in the low pressure accumulator 43 .

The pump 44 is driven by the motor 45 to suck and discharge the brake oil stored in the low-pressure accumulator 43 to deliver hydraulic pressure to the wheel cylinder 30 side or the master cylinder 20 side.

A normally open solenoid valve 47 (hereinafter referred to as TC valve) for traction control control (TCS) is installed in the main flow path 47a connecting the master cylinder 20 and the discharge port of the pump 44 . The TC valve 47 is normally kept open so that, during general braking through the brake pedal 10, the braking hydraulic pressure formed in the master cylinder 20 is transmitted to the wheel cylinder 30 through the main flow path 47a. do.

In addition, the auxiliary flow path 48a is branched from the main flow path 47a and guides the brake oil of the master cylinder 20 to be sucked toward the inlet side of the pump 44, in which the brake oil flows only through the inlet of the pump 44. A shuttle valve 48 is installed to allow The electrically operated shuttle valve 48 is installed in the middle of the auxiliary flow path 48a and is normally closed and operates to be opened in the TCS mode.

Meanwhile, reference numeral 49, which has not been described, denotes a check valve installed at an appropriate flow path to prevent reverse flow of brake oil, and reference numeral 50 denotes the braking pressure transmitted to the TC valve 47 and the shuttle valve 48 . It is a pressure sensor that detects

On the other hand, the orifice device 100 for reducing the pressure pulsation from the hydraulic pressure pumped from the pump 44 is provided as shown in FIGS. 2 to 4 .

Figure 2 is an exploded perspective view of an orifice device according to an embodiment of the present invention, Figure 3 is a cross-sectional view of the orifice device according to an embodiment of the present invention, Figure 4 is a plunger of the orifice device according to an embodiment of the present invention It is a perspective view, FIG. 5 is a cross-sectional view taken along line II of FIG. 3, and FIG. 6 is a state in which the plunger of the orifice device according to an embodiment of the present invention is moved to an open position of the second orifice, and FIG. 6 is a cross-sectional view taken along line II-II.

2 to 4 , the orifice device 100 according to an embodiment of the present invention is installed in a bore communicating with an in port through which the brake oil discharged from the pump 44 is introduced and an out port through which the brake oil is discharged. do.

The orifice device 100 is provided on the main flow path 47a, and includes bodies 110 and 120 having an inlet 121 and an outlet 111, and the inlet 121 is a main connected to the discharge end of the pump 44. It is connected to the flow path (47a), the outlet 111 is connected to the main flow path (47a) connected to the master cylinder (20).

The bodies 110 and 120 of the orifice device 100 may include a hollow cylindrical casing 110 with an open top, and a stopper 120 covering the open top of the casing 110 .

In addition, the orifice device 100 is slidably mounted inside the body 110 and 120 in a state supported by the elastic member 130, and a plunger having a plurality of orifices for communicating the inlet 121 and the outlet 111 ( 140).

The casing 110 has a first chamber 112 in which the elastic member 130 is located, and an outlet 111 is formed at the bottom thereof.

The stopper 120 may be press-fitted to cover the open upper portion of the casing 110 , and an inlet 121 is formed on the side thereof.

The stopper 120 covers the open upper portion of the casing 110 and extends downward from the cover portion 123 coupled to the bore of the modulator block and the cover portion 123 and communicates with the inlet 121 therein. and a coupling portion 124 forming a second chamber 122 .

The coupling portion 124 has a diameter that can be press-fitted into the inner surface of the casing 110 , and when the casing 110 is press-fitted, the inlet 121 is exposed to the upper portion of the casing 110 .

The plunger 140 divides the first chamber 112 and the second chamber 122 up and down when positioned inside the bodies 110 and 120, and a plurality of communicating the first chamber 112 and the second chamber 122 an orifice of

3 to 7 , the plurality of orifices includes a first orifice 141 that always communicates the inlet 121 and the outlet 111 , and the plunger 140 by the pressure of the oil introduced through the inlet 121 . ) includes a second orifice 142 for communicating the inlet 121 and the outlet 111 when moving.

The plunger 140 may be formed in a cylindrical plunger body having a vertical length, and may be formed in a stepped multi-stage shape along the longitudinal direction of the plunger body.

The plunger body has a first portion 140a having an oil groove 143 formed on the outer periphery from an upper end positioned near the inlet 121, and a second orifice 142 at a position spaced apart from the first portion 140a. The second part 140b in which the cut-out groove 144 is formed, the third part 140c forming the sealing part 145, and the sealing part 145 are positioned below the inner wall of the casing 110 along the inner wall. It includes a fourth part 140d that slides and a fifth part 140e positioned below the fourth part 140d so that the elastic member 130 is mounted.

The first orifice 141 for constantly communicating the first chamber 112 and the second chamber 122 is cut vertically at the second portion 140b and the third portion 140c along the length direction of the plunger body. is formed by an elongated slot 146 .

The first portion 140a has a cylindrical shape having a predetermined thickness, and at least one oil groove 143 spaced apart from each other at predetermined intervals along the circumferential direction and concave in the radial direction is formed on the outer periphery thereof.

At least one oil groove 143 forms a flow path through which brake oil can pass between the outer periphery of the first part 140a and the inner wall of the second chamber 122, and the plunger 140 descends to the maximum position. When performing a function of communicating the first chamber 112 and the second chamber (122).

The sealing part 145 corresponds to the sealing surface 125 so that the plunger 140 is in close contact with the tapered sealing surface 125 formed at the lower end of the stopper 120 in a state in which the plunger 140 is pressed by the elastic force of the elastic member 130 . It is made in a tapered shape.

The sealing part 145 moves the first chamber 112 and the second chamber 122 up and down when the plunger 140 is pressed by the elastic member 130 in the body 110 and 120 and is in close contact with the sealing surface 125 . It performs a function of sealing between the second orifice 142 and the first chamber 112 while dividing.

Therefore, as shown in FIGS. 6 and 7 , when the plunger 140 moves to a position facing the sealing surface 125 by the pressure of the brake oil, the second orifice 142 moves the brake oil from the second chamber 122 to the first It is a flow path that can pass toward the chamber 112 .

Meanwhile, in the first orifice 141 , even if the plunger 140 is pressed by the elastic member 130 and the sealing part 145 is in close contact with the sealing surface 125 , the brake oil constantly passes between the sealing surfaces 125 . Euro can do it.

The fourth part 140d is provided in the form of a flange that can slide along the inner wall of the first chamber 112 to guide the stable movement of the plunger 140, and cutouts ( 147) is formed.

The cutout 147 is a flow path through which the brake oil can move downward between the inner walls of the first chamber 112 .

The fifth part 140e has a shaft having a relatively smaller diameter than that of the fourth part 140d, and the elastic member 130 made of a coil spring may be inserted into the fifth part 140e.

A cut-out groove 148 continuously extending below the cut-out 147 may be formed in the fifth portion 140e to reduce the flow resistance of the brake oil flowing along the cut-out 147 .

A pair of ribs 149 positioned to face each other are extended at the lower end of the fifth part 140e, and a flow path 149a through which the brake oil passes is provided between the pair of ribs 149 .

The pair of ribs 149 pass through the outlet 111 and protrude to the outside of the outlet 111 when the plunger 140 moves to the maximum descending position, and the brake oil is discharged through the flow path 149a formed therebetween. allow that

Hereinafter, an operation of the orifice device for a brake system according to an embodiment of the present invention will be described with reference to FIGS. 8 to 10 . 8 is a view showing the flow of brake oil when the plunger is in the initial position according to an embodiment of the present invention, and FIG. FIG. 10 illustrates the flow of brake oil in a state in which the plunger is lowered to the maximum position according to an embodiment of the present invention.

First, as shown in FIG. 8 , when the pressure of the brake oil flowing in through the inlet 121 is not greater than the elastic force of the elastic member 130 , the plunger 140 does not move.

Accordingly, the brake oil introduced into the second chamber 122 through the inlet 121 is supplied to the first chamber 112 through the first orifice 141 that maintains an always open state, and then the outlet 111 is closed. discharged through

9, when the pressure of the brake oil flowing in through the inlet 121 is greater than the elastic force of the elastic member 130, the plunger 140 moves downward, and the first orifice 141 and the second orifice ( The first chamber 112 and the second chamber 122 are communicated by means of 142, and the brake oil introduced into the second chamber 122 through the inlet 121 is transferred to the first orifice 141 and the second orifice ( After being supplied to the first chamber 112 through 142 , it is discharged through the outlet 111 . Therefore, by changing the flow of the flow rate linearly, the flow rate is prevented from rapidly increasing.

As shown in FIG. 10 , when the plunger 140 is lowered to the maximum position by the pressure of the brake oil flowing in through the inlet 121 , the brake oil flowing into the second chamber 122 is the first of the plunger 140 . The oil is supplied to the first chamber 112 through the oil groove 143 provided in the portion 140a, and is discharged through the outlet 111 through the lower flow path 149a of the plunger 140.

In the above, specific embodiments have been shown and described. However, it is not limited to the above-described embodiment, and those of ordinary skill in the art to which the invention pertains will be able to make various changes without departing from the spirit of the invention described in the claims below.

100: orifice device, 110: casing,
111: outlet, 112 first chamber;
120: stopper, 121: inlet,
122: second chamber, 123: cover portion,
125: sealing surface, 130: elastic member,
140: plunger, 140a: first part;
140b: second part, 140c: third part;
140d: fourth part, 140e: fifth part;
141: a first orifice, 142: a second orifice,
143: oil groove, 145: sealing part,
146 slots, 149 ribs.

Claims (8)

a body having an inlet through which the brake oil discharged from the pump is introduced and an outlet through which the brake oil is discharged;
a plunger mounted to be slidably moved in the body while supported by the elastic member, the plunger having a plurality of orifices for communicating the inlet and the outlet; and
The plurality of orifices includes a first orifice for always communicating the inlet and the outlet, and a second orifice provided to communicate the inlet and the outlet when the plunger moves by the pressure of oil introduced through the inlet. An orifice device for a brake system comprising a. According to claim 1,
The plunger is provided with a sealing portion for partitioning a first chamber in which the outlet is located and a second chamber in which the inlet is located in the body, and seals between the second orifice and the first chamber when the plunger does not move. Orifice device for brake system. 3. The method of claim 2,
The orifice device for a brake system comprising: a casing forming the first chamber therein and having an open side; and a stopper coupled to cover the open portion of the casing and forming the second chamber therein. 4. The method of claim 3,
An orifice device for a brake system provided with a tapered sealing surface in close contact with the sealing part at an end of the stopper. 4. The method of claim 3,
The plunger includes a long cylindrical plunger body,
The plunger body includes a first portion positioned near the inlet port, a second portion formed with a groove forming the second orifice at a position spaced apart from the first portion, and a third portion forming the sealing portion; An orifice device for a brake system comprising: a fourth part supporting an elastic member and moving along an inner wall of the casing; and a fifth part to which the elastic member is mounted. 6. The method of claim 5,
An orifice device for a brake system, wherein a slot cut out along a longitudinal direction of the plunger body to form the first orifice is formed in the second part and the third part. 6. The method of claim 5,
The first part slides along the inner surface of the body, and the orifice device for a brake system is provided with an oil groove that is spaced apart from each other at predetermined intervals in the circumferential direction on the outer periphery of the first part and is recessed in the radial direction. 8. The method of claim 7,
The oil groove is an orifice device for a brake system for communicating the first chamber and the second chamber when the plunger is lowered to the maximum position by the pressure of the brake oil.

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