KR101648469B1 - Hydraulic system of actuator for vehicle - Google Patents

Hydraulic system of actuator for vehicle Download PDF

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Publication number
KR101648469B1
KR101648469B1 KR1020150188412A KR20150188412A KR101648469B1 KR 101648469 B1 KR101648469 B1 KR 101648469B1 KR 1020150188412 A KR1020150188412 A KR 1020150188412A KR 20150188412 A KR20150188412 A KR 20150188412A KR 101648469 B1 KR101648469 B1 KR 101648469B1
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KR
South Korea
Prior art keywords
hydraulic
pressure
hydraulic fluid
spool
fluid
Prior art date
Application number
KR1020150188412A
Other languages
Korean (ko)
Inventor
최세빈
이한구
김영용
Original Assignee
주식회사 인팩
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Priority to KR1020150188412A priority Critical patent/KR101648469B1/en
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Publication of KR101648469B1 publication Critical patent/KR101648469B1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K17/00—Arrangement or mounting of transmissions in vehicles
    • B60K17/34—Arrangement or mounting of transmissions in vehicles for driving both front and rear wheels, e.g. four wheel drive vehicles
    • B60K17/348—Arrangement or mounting of transmissions in vehicles for driving both front and rear wheels, e.g. four wheel drive vehicles having differential means for driving one set of wheels, e.g. the front, at one speed and the other set, e.g. the rear, at a different speed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K23/00—Arrangement or mounting of control devices for vehicle transmissions, or parts thereof, not otherwise provided for
    • B60K23/04—Arrangement or mounting of control devices for vehicle transmissions, or parts thereof, not otherwise provided for for differential gearing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

The present invention relates to a hydraulic system of an actuator for a vehicle, comprising: an actuator operated by hydraulic fluid; a hydraulic pump for exerting pressure on the hydraulic fluid; a pressure sensor for measuring the pressure of the hydraulic fluid; a fluid storage tank for storing the hydraulic fluid; a control unit connected to the pressure sensor and controlling the hydraulic pump; and a spool valve for supplying the hydraulic fluid to the actuator if hydraulic pressure reaches a preset pressure, and discharging the hydraulic fluid to the fluid storage tank if the hydraulic pressure is smaller or greater than the preset pressure. Accordingly, a backward flow can be prevented by improving the precision of a hydraulic circuit and production costs can be reduced by reducing the number of parts.

Description

HYDRAULIC SYSTEM OF ACTUATOR FOR VEHICLE [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic system of an actuator for a vehicle, and more particularly to a hydraulic system for operating an AWD actuator for a vehicle.

The hydraulic system of the vehicle actuator implements the action of accelerating the vehicle by reciprocating the piston by hydraulic pressure. At this time, it is necessary to precisely control the hydraulic system, and it is necessary to keep the pressure lower than the predetermined pressure.

1, a conventional hydraulic system includes a hydraulic fluid 1, an operating member 2 that can be operated by a hydraulic fluid, And a pressure sensor (4) connected to the control unit (6) and for measuring the fluid pressure, the relief valve (3) being operable to generate a relief valve 7 to limit fluid pressure to a minimum value.

That is, in the prior art, the control unit 6 operates the fluid pump 3 at a predetermined pressure, and when the control unit 6 exceeds the preset pressure, the control unit 6 outputs the signal of the pressure sensor 4 And the relief valve 7 was operated to control the fluid pressure.

However, in this case, if an error occurs in the pressure sensor 4, an error may occur in the pressure of the hydraulic fluid 1 supplied from the fluid pump 3, and an error may also occur in the operating pressure of the relief valve 7 Precision control is difficult.

Further, the control unit 6 controls the relief valve 7 and the fluid pump 3, respectively, and there is a time interval and an error occurrence probability required for the control. Therefore, there is a possibility of backflow, and it is necessary to set a preload (pressure previously applied to eliminate the gap) to be high in order to prevent backflow.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the problems of the hydraulic system of a conventional automotive actuator, and it is an object of the present invention to provide a vehicular actuator which can improve the precision of a hydraulic circuit to prevent reverse flow, To provide a hydraulic system.

According to an aspect of the present invention, there is provided a hydraulic system for an actuator for a vehicle including an actuator operated by a hydraulic fluid, a hydraulic pump for applying pressure to the hydraulic fluid, a pressure sensor for measuring a pressure of the hydraulic fluid, A control unit connected to the pressure sensor and controlling the hydraulic pump; and a control unit for supplying the hydraulic fluid to the actuator when the hydraulic pressure reaches a preset pressure, And a spool valve for discharging the hydraulic fluid to the fluid storage tank.

At this time, it is possible to further include a return spring provided inside the spool valve and configured to move the spool provided in the spool valve in a reverse direction due to elasticity.

The spool valve may include a first supply port connected to the hydraulic pump and connected to the hydraulic pump so that the hydraulic fluid flows into the first supply port and the spool is moved to a pressure at which the hydraulic fluid is introduced A second supply port connected to the actuator and configured to allow the hydraulic fluid to flow into the actuator upon reaching a preset hydraulic pressure; A first drain port formed to be discharged to the fluid storage tank and a second drain port connected to the fluid storage tank and configured to discharge the hydraulic fluid to the fluid storage tank when a predetermined hydraulic pressure is exceeded.

The spool valve may include a first supply passage formed to connect the hydraulic pump and the first supply port, a second supply passage branched from the first supply passage and configured to be connected to the second supply port, A first drain port formed to connect the first drain port and the fluid storage tank and a second drain port formed to connect the second drain port and the fluid storage tank, It is also possible to include more.

When the pressure of the hydraulic fluid is less than a preset pressure, the first supply passage and the first drain passage are communicated with each other. When the pressure of the hydraulic fluid reaches a predetermined pressure, the first supply passage and the operating oil And to allow the second supply passage and the second drain passage to communicate with each other when the pressure of the hydraulic fluid exceeds a predetermined pressure.

The spool valve is connected to the return spring and is resiliently supported. The spool valve is connected to the first spool, and moves between the first drain port and the operation port while opening and closing the first drain port and the operation port. And a third spool which is connected to the second spool and is moved by the hydraulic fluid flowing through the second drain port and opens and closes the second drain port.

As described above, according to the hydraulic system of the actuator according to the present invention, it is possible to reduce the preload through the precise hydraulic circuit, prevent reverse flow, and improve the production efficiency by reducing the number of parts.

1 is a schematic circuit diagram of a hydraulic system of a conventional vehicle actuator,
2 is a schematic circuit diagram of a hydraulic system of an actuator for a vehicle according to an embodiment of the present invention;
3 is an operational state of the spool valve in the initial state,
4 is an operational state of the spool valve at the time of actuator operation,
5 is an operational state view of the spool valve when the preset hydraulic pressure is exceeded.

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

2 and 3, a hydraulic system of an actuator for a vehicle according to an embodiment of the present invention includes a spool valve 100, an actuator 200, a hydraulic pump 300, a pressure sensor 400, a fluid storage tank 500 and a control unit 600. The spool valve 100 is formed with a first supply port 111, a second supply port 112, an operation port 113, a first drain port 114 and a second drain port 115, The first supply passage 121, the second supply passage 122, the hydraulic oil passage 123, the first drain passage 124, and the second drain passage 125 are connected. The spool valve 100 is provided with a first spool 131, a second spool 132 and a third spool 133 and a return spring 140.

The hydraulic pump 300 is connected to the first supply port 111 through the first supply passage 121 and the second supply passage 122 is branched from the first supply passage 121, And is connected to the second supply port 112. Here, the hydraulic pump 300 includes a motor 310 and a filter 320.

The actuator 200 is connected to the operation port 113 through the hydraulic oil path 123.

The fluid storage tank 500 is connected to the first drain port 114 through the first drain flow path 124 and is connected to the second drain port 115 through the second drain flow path 125. [ And is also connected to the filter 320.

The return spring 140 is provided at one end of the spool valve 100 and the second supply port 112 is formed at the other end of the spool valve 100. At this time, the return spring 140 is connected to the first spool 131 to elastically support the first spool 131, and the first spool 131 is connected to the second spool 132 integrally And the second spool 132 is integrally connected to the third spool 133.

The first drain port 114, the first supply port 111, the operation port 113, and the second supply port 114 are formed in a direction in which the return spring 140 is provided, And the second drain port 115 are formed in turn.

The first spool 131 is provided between the return spring 140 and the first drain port 114 and the second spool 132 is provided between the first supply port 111 and the second drain port 114. [ And the third spool 133 is provided between the second drain port 115 and the second supply port 112. The second spool 133 is provided between the second drain port 115 and the second supply port 112. [

The operation of the hydraulic system of the vehicle actuator according to the embodiment of the present invention will now be described with reference to FIGS. 4 and 5. In the initial state, the motor 310 is operated and the hydraulic pressure The fluid passes through the filter 320 and enters the first supply passage 121 from the hydraulic pump 300. At this time, the hydraulic fluid is branched into the first supply passage 121 and the second supply passage 122 and flows into the first supply port 111 and the second supply port 112. Since the first supply passage 121 and the first drain passage 124 are communicated in the initial state, the hydraulic fluid introduced into the first supply port 111 is discharged to the first drain port 114 And the hydraulic fluid flowing into the second supply port 112 is compressed and presses the third spool 133. Accordingly, since the supplied hydraulic fluid is discharged as it is between the first spool 131 and the second spool 132, there is no increase in pressure, but the third spool 133 is pressurized in the direction of the return spring 140 The first spool 131, the second spool 132, and the third spool 133 are moved toward the return spring 140 together.

Meanwhile, the first spool 131 receives a restoring force in a direction opposite to a direction in which the return spring 140 is pressed by the hydraulic fluid (in the direction of the second supply port 112). Thus, the equilibrium of the third spool 133, the pressing force (F P) and the return spring 140, the first spool 131, the pressing force (F T) by the elastic force of by the pressure of the hydraulic fluid The positions of the first spool 131, the second spool 132, and the third spool 133 are determined.

4, when the pressure of the hydraulic fluid reaches a predetermined pressure, the first spool 131, the second spool 132, and the third spool 133 are moved together, (121) and the hydraulic oil path (123). That is, the hydraulic fluid flowing into the first supply port 111 flows into the operation port 113 to operate the actuator 200.

5, when the pressure of the hydraulic fluid exceeds a predetermined pressure, the first spool 131, the second spool 132, and the third spool 133 are moved together to move the operation port 113 And closes the second drain port 115 at the same time. Therefore, the second supply passage 122 and the second drain passage 125 are communicated with each other. As a result, the hydraulic fluid flowing into the second supply port 112 is discharged to the second drain port 115, and the hydraulic fluid flowing between the second supply port 112 and the third spool 133 Reduce pressure. The first spool 131, the second spool 132, and the third spool 133 are again driven by the elastic force of the return spring 140, The second drain port 115 is closed and the operation port 113 is opened while being moved toward the second supply port 112. [

Meanwhile, the pressure sensor 400 measures the pressure of the hydraulic fluid and sends a signal to the control unit 600, and the control unit 600 calculates the pressure of the hydraulic fluid based on the pressure of the hydraulic fluid sent from the pressure sensor 400 And controls the operation of the actuator 200 by controlling the hydraulic pump 300 to regulate the pressure of the hydraulic fluid.

According to the present invention, when the pressure of the hydraulic fluid reaches a predetermined pressure by the operation of the spool valve 100, the hydraulic fluid is supplied to the actuator 200, and when the pressure of the hydraulic fluid is less than a preset pressure And the hydraulic fluid is discharged to the fluid storage tank 500 when it is large. At this time, since the first drain port 114, the operation port 113 and the second drain port 115 are opened / closed at the same time, precise opening and closing is possible, and there is no time interval required for opening and closing, , It is possible to lower the pre-pressure to prevent backflow.

In addition, since no separate parts such as a relief valve are required, the number of parts is reduced, thereby reducing the production and assembly process, thereby reducing the production cost.

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 embodiments, but, on the contrary, It is obvious that the modification or the modification is possible by the person.

 It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

100: Spool valve
111: first supply port
112: second supply port
113: Operation port
114: first drain port
115: second drain port
121: first supply passage
122: second supply passage
123: Working fluid
124: First drain line
125: second drain line
131: first spool
132: second spool
133: Third spool
140: return spring
200: Actuator
300: Hydraulic pump
400: Pressure sensor
500: Fluid storage tank
600: control unit

Claims (6)

An actuator driven by a hydraulic fluid;
A hydraulic pump for applying pressure to the hydraulic fluid;
A pressure sensor for measuring a pressure of the hydraulic fluid;
A fluid storage tank for storing the hydraulic fluid;
A control unit connected to the pressure sensor and controlling the hydraulic pump; And
The hydraulic fluid is supplied to the actuator when the pressure of the hydraulic fluid reaches a predetermined pressure, and the spool valve for discharging the hydraulic fluid to the fluid storage tank when the pressure of the hydraulic fluid is lower than a predetermined pressure, ;
Wherein the hydraulic actuator is a hydraulic actuator.
The method according to claim 1,
A return spring provided inside the spool valve and configured to move the spool provided in the spool valve in a reverse direction by elasticity;
The hydraulic system further comprising:
3. The method of claim 2,
Wherein the spool valve includes:
A first supply port connected to the hydraulic pump and configured to receive the hydraulic fluid;
A second supply port connected to the hydraulic pump to receive the hydraulic fluid and to move the spool to a pressure at which the hydraulic fluid is introduced;
A working port connected to the actuator and configured to allow the hydraulic fluid to flow into the actuator when the pressure of the hydraulic fluid reaches a preset pressure;
A first drain port connected to the fluid storage tank and configured to discharge the hydraulic fluid to the fluid storage tank when the pressure of the hydraulic fluid reaches a preset pressure; And
A second drain port connected to the fluid storage tank and configured to discharge the hydraulic fluid to the fluid storage tank when the pressure of the hydraulic fluid exceeds a predetermined pressure;
Wherein the hydraulic actuator is a hydraulic actuator.
The method of claim 3,
Wherein the spool valve includes:
A first supply passage formed to connect the hydraulic pump and the first supply port;
A second supply passage formed to be branched from the first supply passage and connected to the second supply port;
An operating oil formed to connect the actuating port and the actuator;
A first drain passage formed to connect the first drain port and the fluid storage tank; And
A second drain channel formed to connect the second drain port and the fluid storage tank;
Further comprising: a hydraulic pressure sensor for detecting hydraulic pressure in the hydraulic actuator.
5. The method of claim 4,
Wherein the spool valve includes:
When the pressure of the hydraulic fluid is lower than a preset pressure, the first supply passage and the first drain passage are communicated with each other, and when the pressure of the hydraulic fluid reaches a preset pressure, And the second supply passage and the second drain passage communicate with each other when the pressure of the hydraulic fluid exceeds a preset pressure.
6. The method of claim 5,
Wherein the spool valve includes:
A first spool connected to the return spring and elastically supported;
A second spool connected to the first spool and opening / closing the first drain port and the operation port while moving between the first drain port and the operation port; And
A third spool connected to the second spool and moved by the hydraulic fluid flowing through the second drain port and opening / closing the second drain port;
Further comprising: a hydraulic pressure sensor for detecting hydraulic pressure in the hydraulic actuator.
KR1020150188412A 2015-12-29 2015-12-29 Hydraulic system of actuator for vehicle KR101648469B1 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101879712B1 (en) * 2016-12-16 2018-07-18 주식회사 인팩 Hydraulic system of actuator for vehicle
KR101879732B1 (en) * 2016-12-16 2018-07-18 주식회사 인팩 Hydraulic system of actuator for vehicle
KR101879720B1 (en) * 2016-12-16 2018-07-18 주식회사 인팩 Hydraulic system of actuator for vehicle

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3189689B2 (en) * 1996-06-07 2001-07-16 トヨタ自動車株式会社 Actuator drive and suspension device
KR20120029791A (en) * 2010-09-17 2012-03-27 주식회사 인팩 Active roll stabilization system
KR20130048073A (en) * 2011-11-01 2013-05-09 주식회사 인팩 Pneumatic control system of air spring for vehicle
KR20150122185A (en) * 2013-03-06 2015-10-30 캐터필러 에스에이알엘 Pressure loss reducing circuit for a works machine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3189689B2 (en) * 1996-06-07 2001-07-16 トヨタ自動車株式会社 Actuator drive and suspension device
KR20120029791A (en) * 2010-09-17 2012-03-27 주식회사 인팩 Active roll stabilization system
KR20130048073A (en) * 2011-11-01 2013-05-09 주식회사 인팩 Pneumatic control system of air spring for vehicle
KR20150122185A (en) * 2013-03-06 2015-10-30 캐터필러 에스에이알엘 Pressure loss reducing circuit for a works machine

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101879712B1 (en) * 2016-12-16 2018-07-18 주식회사 인팩 Hydraulic system of actuator for vehicle
KR101879732B1 (en) * 2016-12-16 2018-07-18 주식회사 인팩 Hydraulic system of actuator for vehicle
KR101879720B1 (en) * 2016-12-16 2018-07-18 주식회사 인팩 Hydraulic system of actuator for vehicle

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