KR20180007795A - Hydraulic feeding device for brake system - Google Patents

Abstract

Disclosed is a hydraulic pressure supply device for a brake system. According to an embodiment of the present invention, the hydraulic pressure supply device for a brake system is operated by receiving a will to brake of a driver, as an electrical signal, from a pedal displacement sensor that senses displacement according to a pedal effort of a brake pedal, so as to generate hydraulic pressure received to a wheel cylinder provided on each wheel. The hydraulic pressure supply device comprises: a hydraulic pressure portion formed with a bore having a small diameter portion therein in the longitudinal direction and a large diameter portion expanded from the small diameter portion; a pressing portion for dividing the large diameter portion and the small diameter portion into a first hydraulic pressure chamber and a second hydraulic pressure chamber, and provided to be able to move on the bore, and pressing the first hydraulic pressure chamber or the second hydraulic pressure chamber depending on a movement; and an actuator connected to the pressing portion and operated by receiving the electrical signal from the pedal displacement sensor to transfer driving force to the pressing portion.

Description

Technical Field [0001] The present invention relates to a hydraulic feeding device for a brake system,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic pressure supply apparatus, and more particularly, to a hydraulic pressure supply apparatus for a brake system capable of improving braking responsiveness and precise pressure control.

The vehicle is essentially equipped with a brake system for braking. Recently, various types of systems have been proposed to obtain a more powerful and stable braking force. For example, an intelligent integrated brake (IDB) system has been proposed. The IDB system is proposed to generate stable and strong braking force by integrating the master booster and electronic stability control (ESC).

As an example, an electronic brake system is disclosed in European Patent EP 2520473, Korean Patent Publication No. 10-2013-0092045. According to the disclosed document, the electronic brake system includes a hydraulic pressure supply device for outputting an operation of a brake pedal through an electric signal through a pedal displacement sensor to operate the motor and convert the rotational force of the motor into a linear motion to generate a braking hydraulic pressure, A hydraulic block provided with a plurality of valves for controlling the braking operation by supplying hydraulic pressure by a force generated by the supply device, a pedal simulator for providing a reaction force to the pedal, and an electronic control unit for controlling the motor and the valves.

Here, the hydraulic pressure supply device converts the rotational force of the motor into a linear motion and presses the piston to transmit the braking hydraulic pressure to the wheel cylinders provided on the respective wheels.

However, such a hydraulic pressure supply device has a single-acting structure that generates a hydraulic pressure by a stroke in which a single piston is provided and generates a hydraulic pressure, and thus it is difficult to continuously generate hydraulic pressure to perform an ABS (Anti-Lock Brake System) . That is, when boosting the pressure regenerating or generating pressure, the pressurized piston must be returned to its original position and then operated again, which makes it difficult to generate the pressure quickly and precisely control it.

European patent EP 2 520 473 A1 (Honda Motor Co., Ltd.) Korean Patent Publication No. 10-2013-0092045 (Mando Co., Ltd.) 2013. 08. 20.

The hydraulic pressure supply device for a brake system according to an embodiment of the present invention includes two hydraulic chambers facing each other and a piston is driven in a double-acting manner to quickly generate pressure upon pressure regeneration and boosting the generated pressure , And precise pressure control can be made possible.

According to an aspect of the present invention, there is provided a braking system for a braking system that receives hydraulic braking force of an operator as an electric signal from a pedal displacement sensor that senses a displacement of the brake pedal in response to a power of a brake pedal and generates hydraulic pressure transmitted to a wheel cylinder A hydraulic pressure supply device comprising: a hydraulic pressure unit having a bore having a small diameter portion in the longitudinal direction and a large diameter portion extending from the small diameter portion inside; A pressurizing portion that divides the large diameter portion and the small diameter portion into a first hydraulic pressure chamber and a second hydraulic pressure chamber and is movable forward and backward in the bore to press the first hydraulic pressure chamber or the second hydraulic pressure chamber in accordance with advancement and retraction; And an actuator connected to the pressure unit and operative to receive an electric signal from the pedal displacement sensor to transmit the driving force to the pressure unit.

The first and second fluid pressure chambers are connected to each other so that a part of the oil discharged from the first fluid pressure chamber is transmitted to the second fluid pressure chamber when the pressure of the pressure portion is higher than a predetermined pressure, And can be connected through an oil passage.

The first and second fluid pressure chambers are connected to each other through an oil passage. The oil passage includes a first oil passage connecting a first port formed in the first hydraulic chamber to a wheel cylinder, And a second oil passage connecting the first port and the second port formed in the hydraulic chamber.

The first oil passage is provided with a first control valve for controlling the flow of oil between the first hydraulic chamber and the wheel cylinder, and the second oil passage is provided with a first control valve for controlling the flow of oil between the first hydraulic chamber and the wheel cylinder, A second control valve for controlling the flow of the oil may be provided.

Also, the first control valve and the second control valve may be provided as a normally closed type solenoid valve that is normally closed and operates to open the valve when an open signal is received.

Further, the pressing portion includes a lever which is engaged with a pinion gear that receives a driving force from the actuator and rotates, and linearly moves according to the rotation of the pinion gear; A first piston provided at one side of the lever and having a diameter corresponding to the large diameter portion; And a second piston provided on the other side of the lever and having a diameter corresponding to the small diameter portion.

In addition, the first and second pistons may be desorbed or formed integrally with the lever.

The apparatus may further include a guide member installed on the hydraulic pressure unit and contacting a part of the lever, and guiding the lever when the lever is moved.

In addition, the outer circumferential surfaces of the first and second pistons may be formed with insertion grooves provided with sealing members.

The apparatus may further include a plug member for closing one side of the bore so as to close the inside of the bore.

In addition, the first and second hydraulic pressure chambers may be connected to a reservoir where oil is stored, respectively.

In addition, a check valve may be provided in the connection passage connecting the reservoir and each of the hydraulic chambers so that the oil flows only through the reservoir from the respective hydraulic chambers.

In addition, the pressurizing portion can pressurize the first pressure chamber in a low-pressure section having a large amount of liquid consumption and pressurize the second pressure chamber in a high-pressure section having a small amount of liquid consumption.

The hydraulic pressure supply device for a brake system according to an embodiment of the present invention is provided with a double-acting structure to generate a hydraulic pressure when the piston advances and retreats. Therefore, there is an advantage that the pressure can be regenerated and boosted quickly when the pressure regeneration and the generated pressure are boosted, compared with the conventional method in which the existing pressurized piston is returned to the original position and then pressurized again.

In addition, it is possible to pressurize a piston having a large diameter in a low-pressure section where a liquid amount is consumed rapidly, thereby quickly responding to the consumption of liquid to improve responsiveness, and to generate a large braking pressure by pressing a piston having a small diameter in a high- It is effective.

In addition, it is possible to reduce the capacity of the actuator by controlling the flow of the oil to provide the hydraulic pressure in the direction of generating the hydraulic pressure when the two hydraulic chambers having the double-acting structure are connected and when the pressure is higher than a certain pressure, There is an effect that can be reduced.

BRIEF DESCRIPTION OF THE DRAWINGS The present invention will be described in detail with reference to the following drawings, which illustrate preferred embodiments of the present invention, and thus the technical idea of the present invention should not be construed as being limited thereto.
1 is a hydraulic circuit diagram schematically showing a hydraulic pressure supply device for a brake system according to an embodiment of the present invention.
2 is a hydraulic circuit diagram showing a state in which a braking pressure is generated in a low pressure section through a hydraulic pressure supply device for a brake system according to an embodiment of the present invention.
3 is a hydraulic circuit diagram showing a state in which a braking pressure is generated in a high pressure section through a hydraulic pressure supply device for a brake system according to an embodiment of the present invention.
4 is a hydraulic circuit diagram showing an oil flow state in a first hydraulic pressure chamber and a second hydraulic pressure chamber of a hydraulic pressure supply device for a brake system 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 following embodiments are provided to fully convey the spirit of the present invention to a person having ordinary skill in the art to which the present invention belongs. The present invention is not limited to the embodiments shown herein but may be embodied in other forms. For the sake of clarity, the drawings are not drawn to scale, and the size of the elements may be slightly exaggerated to facilitate understanding.

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

Referring to FIG. 1, a hydraulic pressure supply apparatus 100 includes a hydraulic pressure unit 110 (not shown) provided with hydraulic chambers 114 and 115 for supplying hydraulic pressure to a wheel cylinder 20 provided in each of the wheels RR, RL, A pressure unit 120 provided in the hydraulic pressure unit 110 for pressing the hydraulic chambers 114 and 115 and an actuator 130 for providing driving force to move the pressure unit 120 forward and backward in the hydraulic pressure unit 110 .

The hydraulic pressure supply device 100 is provided in an electronic brake system and is provided with a brake pedal displacement sensor (not shown) for sensing the displacement of the brake pedal, As an apparatus, it should be understood that it is used in connection with an electronic brake system having various hydraulic circuits. In addition, the hydraulic pressure supply device 100 may include a hydraulic pressure unit 110 having a separate cylinder structure to supply hydraulic pressure to the wheel cylinder 20, or a plurality of oil passages and valves for controlling the braking oil pressure It can be installed and used in a hydraulic block of a conventional brake system.

The hydraulic pressure unit 110 includes a bore 111 having one side opened and a small diameter portion 113 in the longitudinal direction and a large diameter portion 112 extending from the small diameter portion 113. At this time, the hydraulic pressure supply device 100 further includes a stopper member 150 for closing one side of the bore 111 to close the inside of the bore 111. The bore 111 may be partitioned into a first hydraulic pressure chamber 114 and a second hydraulic pressure chamber 115 by a pressing portion 120, which is provided in the bore 111 so as to be movable forward and backward. The first hydraulic pressure chamber 114 is formed on the large diameter portion 112 side and the second hydraulic pressure chamber 115 is formed on the small diameter portion 113 side. A first port 116 is connected to the first hydraulic chamber 114 so that the hydraulic pressure generated by the pressing portion 120 is transmitted to the wheel cylinder 20 through the first and second hydraulic chambers 114 and 115 And a second port 117 is formed in the second hydraulic pressure chamber 115. Each of the ports 116 and 117 may be connected to the wheel cylinder 20 through oil passages 141 and 142. [ The connection structure of the oil passages 141 and 142 will be described below again.

The first hydraulic pressure chamber 114 and the second hydraulic pressure chamber 115 are connected to the reservoir 40 in which the oil is stored to be supplied with oil to be stored therein and are pressurized by the pressurization unit 120, . The first and second ports 116 and 117 are formed at the ends of the respective hydraulic pressure chambers 114 and 115 on the direction side where they are pressed by the pressing portion 120. [ The connection fluid passage 145 connecting the first and second fluid pressure chambers 114 and 115 and the reservoir 40 is connected to only the first and second fluid pressure chambers 114 and 115 from the reservoir 40, A check valve 146 is provided.

On the other hand, the pressing area of the first hydraulic pressure chamber 114 pressed by the pressing portion 120 is formed to be larger than the pressing area of the second hydraulic pressure chamber 115 pressed by the pressing portion 120. This is to improve the responsiveness by increasing the flow rate in the low pressure section where the initial liquid amount of braking is consumed. Therefore, in the low-pressure section, the pressurizing portion 120 is moved toward the first pressure chamber 114 on the large-diameter portion 112 side where the pressure area is large. In the high-pressure section, It is preferable to move the pressing portion 120 toward the chamber 115.

The pressing portion 120 is provided on the bore 11 so as to be movable forward and backward. More specifically, the pressing portion 120 includes a first piston 122 provided on one side of the lever 121 and a second piston 123 provided on the other side of the lever 121, Respectively.

The lever 121 is engaged with the pinion gear 131 of the actuator 130 so as to be linearly moved in accordance with the rotation of the pinion gear 131. Since the lever 121 is normally used, a detailed description thereof will be omitted.

The first piston 122 is located on the large-diameter portion 112 side and has a diameter corresponding to the large-diameter portion 112. The second piston 123 is located on the side of the small diameter portion 113 and has a diameter corresponding to that of the small diameter portion 113. The bore 111 is formed in the first and second hydraulic chambers 114 and 115 by the first and second pistons 122 and 123 as the pressing portion 120 is installed on the bore 111. [ . Accordingly, the first and second hydraulic pressure chambers 114 and 115 are pressurized to generate the braking pressure as the lever 121 moves forward and backward. The first and second pistons 122 and 123 are integrally formed with the lever 121, but the present invention is not limited thereto. The first and second pistons 122 and 123 may be detachably mounted on the lever 121. In addition, insertion grooves 122a and 123a are formed on the outer circumferential surfaces of the first and second pistons 122 and 122, respectively. A sealing member 125 is provided in each of the insertion grooves 122a and 123a so as to move together with the first and second pistons 122 and 123. The sealing member 125 serves to seal between the first piston 122 and the first hydraulic pressure chamber 114 and between the second piston 123 and the second hydraulic pressure chamber 115.

On the other hand, a guide member 129 for guiding the lever 121 when the lever 121 moves is further provided. The guide member 129 is provided to be in contact with a part of the lever 121 through the hydraulic pressure unit 110. That is, the guide member 129 is provided so as to contact the opposite side of the gear 121 of the lever 121, so that the guide member 129 stably moves when the lever 121 moves forward and backward.

The actuator 130 for transmitting power to the pressing unit 120 includes a motor 132 and a pinion gear 131 rotated by receiving a rotational force of the motor 132. At this time, the pinion gear 131 engaged with the lever 121 is directly coupled to the rotation shaft (not shown) of the motor 132 to transmit the rotation force to the lever 121. However, To the pinion gear 131 through the speed reducer. The actuator 130 can be operated by receiving an electric signal of the driver's braking will from a pedal displacement sensor (not shown) that senses the displacement of the brake pedal according to the power of the brake pedal.

The hydraulic pressure supply apparatus 100 as described above is constructed so that the hydraulic pressure generated by the movement of the lever 121 is transmitted to the wheel cylinders 20 provided in the respective wheels RR, RL, FR and FL, 115 and the wheel cylinders 20 can be connected through the oil passages 141, 142. More specifically, the oil passages 141 and 142 include a first oil passage 141 connecting the first port 116 formed in the first hydraulic pressure chamber 114 and the wheel cylinder 20, And a second oil passage 142 connecting the first oil passage 141 and the second port 117 formed in the second oil passage 115. The first oil passage 141 is provided with a first control valve 143 for controlling the flow of oil between the first hydraulic chamber 114 and the wheel cylinder 20, 142 is provided with a second control valve 144 for controlling the flow of oil between the first hydraulic pressure chamber 114 and the second hydraulic pressure chamber 115. The first and second control valves 143 and 144 may be provided as a normally closed type solenoid valve that is normally closed and operates to open the valve when an open signal is received. Additionally, the first control valve 143 may be provided and used as a check valve providing flow in one direction. When the first control valve 143 is used as a check valve, the hydraulic pressure generated from the first hydraulic chamber 114 is transferred to the wheel cylinder 20 or the second oil passage 142. The operation of the control valves 143 and 144 will be described below.

Reference numeral 'PS' is a pressure sensor provided in the first oil passage 141 to sense the hydraulic pressure.

A description will now be given of a state in which the hydraulic pressure generated through the hydraulic pressure supply device 100 is transmitted to the wheel cylinder 20.

2 is a hydraulic circuit diagram showing a state in which a braking pressure is generated in a low pressure section through a hydraulic pressure supply device for a brake system according to an embodiment of the present invention.

The hydraulic pressure supply device 100 according to one aspect of the present invention is operated by receiving an electric signal through a tractive displacement sensor (not shown) according to the pressing force of the brake pedal (not shown). The hydraulic pressure supply device 100 shown in FIG. 1 shows an initial state before the operation, and shows the time before the hydraulic pressure is generated. 2, the first piston 122 presses the first hydraulic chamber 114 to generate hydraulic pressure by the pressing portion 120 that receives the rotational force of the motor 132 and linearly moves. do. The hydraulic pressure generated from the first hydraulic pressure chamber 114 is transmitted to the wheel cylinder 20 through the first oil passage 141 connected to the first port 116. At this time, the first control valve 143 provided in the first oil passage 141 is opened and the hydraulic pressure is transmitted to the wheel cylinder 20 through the first oil passage 141. The second control valve 144 provided in the second oil passage 142 is closed and the hydraulic pressure generated in the first hydraulic pressure chamber 114 is transmitted to the wheel cylinder 20 completely. The pressurized area of the first hydraulic pressure chamber 114 is formed to be larger than the pressurized area of the second hydraulic pressure chamber 115. This is because the consumption of the liquid amount is large in the low pressure section of the braking initial stage. That is, as the pressure area of the first hydraulic pressure chamber 114 is formed to be large, the flow rate at the time of pressurizing the first hydraulic pressure chamber 114 in the low pressure section is increased to improve the responsiveness.

Next, when braking pressure is required in addition to braking by the hydraulic pressure supply device 100 as described above, for example, when the ABS or ESC function is performed, the driving force generated from the actuator 130, that is, So that the pressurizing portion 120 is moved toward the small diameter portion 113 to provide the additional fluid pressure. 3, the motor 132 generates a rotational force in a direction opposite to the direction in which the pressing portion 120 advances (the direction of the first hydraulic pressure chamber) so that the pressing portion 120 moves in the retreating direction And pressurizes the second hydraulic pressure chamber 115. At this time, the second control valve 144 is opened and the first control valve 143 is closed. The hydraulic pressure generated by the second piston 123 is transmitted to the wheel cylinder 20 through the second oil passage 142 connected to the second port 117 of the second hydraulic chamber 115. At this time, since the first control valve 143 is closed, the hydraulic pressure generated from the second hydraulic chamber 115 can not be introduced into the first hydraulic chamber 114 and is transmitted to the wheel cylinder 20.

As described above, since the first and second pistons 122 and 123 of the pressing portion 120 move forward and backward to generate a hydraulic pressure, the piston is returned to its original position and then operated again. Not only the pressure can be generated, but precise control becomes possible.

The hydraulic pressure supply apparatus 100 according to an aspect of the present invention connects the first hydraulic chamber 114 and the second hydraulic chamber 115 and selectively connects the first hydraulic chamber 114 and the second hydraulic chamber 115 Can be controlled. This is to reduce the overall size of the system by using an actuator having a small size and a rated capacity of the actuator 130 that provides a driving force to the hydraulic pressure supply device 100. [ 4, when the pressure generated by the pressurizing unit 120 when the first pressure chamber 114 is pressurized by the rotational force of the motor 132 is equal to or higher than a predetermined pressure, the pressure sensed by the pressure sensor PS And opens the second control valve 144 when a pressure larger than the set pressure information is sensed. That is, the hydraulic pressure generated from the first hydraulic pressure chamber 114 is transmitted to the wheel cylinder 20 through the first oil passage 141 and the second oil pressure oil 142 connected to the first oil passage 141 To the second hydraulic pressure chamber (115). Accordingly, the second hydraulic pressure chamber 115 generates a hydraulic pressure in the direction of the arrow P by the hydraulic pressure transmitted from the first hydraulic pressure chamber 114, and transmits the force P to the pressing unit 120. This is because the hydraulic pressure is generated in the intermediate pressure section and the pressing section 120 is driven by the force P transmitted from the second hydraulic chamber 115 together with the driving force generated from the actuator 130, . The actuator 130 that provides the driving force to the pressing portion 120 is moved by the force P transmitted from the second hydraulic chamber 115 to the actuator 130 having a small size, It is possible to reduce the overall size of the system according to the use of the small actuator 130.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It will be understood that various modifications and changes may be made without departing from the scope of the appended claims.

100: hydraulic pressure supply device 110: hydraulic pressure unit
112: large-diameter portion 114: first hydraulic pressure chamber
113: Small diameter part 115: Second hydraulic pressure chamber
120: pressing portion 121:
122: first piston 123: second piston
130: Actuator 131: Pinion gear
141: first oil passage 142: second oil passage
143: first control valve 144: second control valve
145: connecting channel 150: plug member

Claims (13)

A hydraulic pressure supply device for a brake system, which receives hydraulic braking force of a driver from an electric signal from a pedal displacement sensor for detecting a displacement of the brake pedal to generate a hydraulic pressure to be transmitted to a wheel cylinder provided in each wheel,
A hydraulic pressure portion having a small diameter portion in a longitudinal direction and a bore having a large diameter portion extended from the small diameter portion;
A pressurizing portion that divides the large diameter portion and the small diameter portion into a first hydraulic pressure chamber and a second hydraulic pressure chamber and is movable forward and backward in the bore to press the first hydraulic pressure chamber or the second hydraulic pressure chamber in accordance with advancement and retraction; And
And an actuator connected to the pressurizing portion and operative to receive an electrical signal from the pedal displacement sensor to transmit a driving force to the pressurizing portion. The method according to claim 1,
The first and second hydraulic pressure chambers are connected to the first hydraulic pressure chamber so that a part of the oil discharged from the first hydraulic pressure chamber is transferred to the second hydraulic pressure chamber when the pressure of the pressurizing portion is higher than a predetermined pressure, And a hydraulic pressure supply device for the brake system. 3. The method of claim 2,
Wherein the first and second hydraulic pressure chambers are connected to the wheel cylinder through an oil passage,
The oil passage includes a first oil passage connecting the first port formed in the first hydraulic pressure chamber and the wheel cylinder, and a second oil passage connecting the second port formed in the second hydraulic chamber with the first oil passage A hydraulic pressure supply device for a brake system. The method of claim 3,
Wherein the first oil passage is provided with a first control valve for controlling the flow of oil between the first hydraulic chamber and the wheel cylinder, and the second oil passage is provided with a first control valve for controlling the flow of oil between the first hydraulic chamber and the second hydraulic chamber And a second control valve for controlling the flow of the hydraulic fluid. 5. The method of claim 4,
Wherein the first control valve and the second control valve are normally closed and are provided with a normally closed type solenoid valve that operates to open the valve when an open signal is received. The method according to claim 1,
The pressing portion
A lever that engages with a rotating pinion gear that receives driving force from the actuator and linearly moves in accordance with rotation of the pinion gear;
A first piston provided at one side of the lever and having a diameter corresponding to the large diameter portion; And
And a second piston provided on the other side of the lever and having a diameter corresponding to the small diameter portion. The method according to claim 6,
Wherein the first and second pistons are detachably or integrally formed with the lever. The method according to claim 6,
Further comprising a guide member installed on the hydraulic pressure unit and contacting a part of the lever, and guiding the lever when the lever is moved. The method according to claim 6,
Wherein an insertion groove is formed in an outer circumferential surface of each of the first and second pistons to provide a sealing member. The method according to claim 1,
Further comprising a plug member for closing an open side of the bore to seal the inside of the bore. The method according to claim 1,
Wherein the first hydraulic pressure chamber and the second hydraulic pressure chamber are connected to a reservoir in which oil is stored, respectively. 12. The method of claim 11,
And a check valve is provided in the connection passage connecting the reservoir and each of the hydraulic pressure chambers so that the oil flows only through the reservoir from the respective hydraulic pressure chambers. The method according to claim 1,
Wherein the pressurizing portion pressurizes the first hydraulic chamber in a low pressure section where the liquid amount consumption is large and pressurizes the second hydraulic chamber in a high pressure section in which the liquid amount consumption is small.

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