KR20080097027A - Hydraulic circuit of heavy equipment of having variable relief valve inner type - Google Patents

Hydraulic circuit of heavy equipment of having variable relief valve inner type Download PDF

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Publication number
KR20080097027A
KR20080097027A KR1020070042099A KR20070042099A KR20080097027A KR 20080097027 A KR20080097027 A KR 20080097027A KR 1020070042099 A KR1020070042099 A KR 1020070042099A KR 20070042099 A KR20070042099 A KR 20070042099A KR 20080097027 A KR20080097027 A KR 20080097027A
Authority
KR
South Korea
Prior art keywords
relief valve
hydraulic
variable relief
variable
main control
Prior art date
Application number
KR1020070042099A
Other languages
Korean (ko)
Inventor
송영복
Original Assignee
볼보 컨스트럭션 이키프먼트 홀딩 스웨덴 에이비
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 볼보 컨스트럭션 이키프먼트 홀딩 스웨덴 에이비 filed Critical 볼보 컨스트럭션 이키프먼트 홀딩 스웨덴 에이비
Priority to KR1020070042099A priority Critical patent/KR20080097027A/en
Publication of KR20080097027A publication Critical patent/KR20080097027A/en

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2221—Control of flow rate; Load sensing arrangements
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2264—Arrangements or adaptations of elements for hydraulic drives
    • E02F9/2267—Valves or distributors
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2278—Hydraulic circuits
    • E02F9/2296—Systems with a variable displacement pump
    • 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
    • F15B13/024—Pressure relief valves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2200/00—Type of vehicle
    • B60Y2200/40—Special vehicles
    • B60Y2200/41—Construction vehicles, e.g. graders, excavators
    • B60Y2200/412—Excavators

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Safety Valves (AREA)

Abstract

A hydraulic circuit for heavy equipment is provided to utilize the space efficiently by simplifying the hydraulic piping structure. A hydraulic circuit for heavy equipment comprises a variable displacement pump(1), a main relief valve installed at the discharge oil of the hydraulic pump upstream(2), an option working machine connected to the hydraulic pump(3), a main control valve including the spool(5) for the option working machine controlling the moving of the option working machine, and pause and redirection(4), a variable relief valves(14,15) which variably set the relief pressure required from the option working machine.

Description

Hydraulic circuit of heavy equipment of having variable relief valve inner type

1 is a hydraulic circuit diagram for a heavy equipment having a variable relief valve according to the prior art,

2 is a hydraulic circuit diagram for heavy equipment having a built-in variable relief valve according to an embodiment of the present invention.

* Explanation of symbols used in the main part of the drawing

One; Variable displacement hydraulic pump

2; Main relief valve

3; Option working machine

4; Main control valve (MCV)

5; Spool for Option Work Tool

8; Controller (V-ECU)

14,15; Variable relief valve

16; Hydraulic tank

According to the present invention, when the excavator is equipped with an optional work tool (hammer, breaker) according to the working conditions, the hydraulic pressure for heavy equipment having a built-in variable relief valve to variably adjust the relief pressure required for the operation of the replaced optional work machine It is about a circuit.

More specifically, a variable relief valve that variably adjusts the working pressure of the option machine to be replaced is installed inside the main control valve (MCV), and a port relief valve is provided by a variable relief valve. The present invention relates to a hydraulic circuit for heavy equipment having a built-in variable relief valve that simplifies the hydraulic piping structure.

In order to utilize the excavator as a versatile, the bucket is removed according to the working conditions, and an option attachment such as a hammer is installed. At this time, since the working pressure is different depending on the type of the optional work machine, the relief pressure of the hydraulic circuit is variably adjusted so that the working pressure required for driving the replaced optional work machine can be supplied.

As shown in Figure 1, the hydraulic circuit for heavy equipment having a variable relief valve according to the prior art, at least one variable displacement hydraulic pump (1),

A main relief valve (2) installed upstream of the discharge oil of the hydraulic pump (1) and draining part or all of the hydraulic oil to the hydraulic tank when an overload exceeding a pressure set in the hydraulic circuit occurs due to an impact from the outside;

An optional work machine 3 (hammer, etc.) connected to the hydraulic pump 1,

The main control valve 4 (MCV) installed in the flow path between the hydraulic pump 1 and the optional work tool 3 and including a spool 5 for the optional work tool for controlling the start, stop and direction change of the optional work tool 3. )Wow,

Port relief valves (6, 7) installed in the supply and return side flow paths between the spool (5) for the optional work tool and the optional work tool (3),

And variable relief valves 9 and 10 for variably adjusting the relief pressure required for the option work machine 3 replaced according to the input of the electrical signal from the controller 8 (V-ECU).

In order to carry out the optional work, the bucket is removed from the excavator and the optional work machine 3 is mounted. Then, an electric signal is input from the controller 8 to the variable relief valves 9 and 10 by operation of the corresponding switch in the driver's seat. Since the relief pressure is formed by the variable relief valves 9 and 10 in response to the input electrical signal, it is possible to supply the hydraulic oil of the pressure required to drive the optional work tool 3.

On the other hand, since the variable relief valves 9 and 10 are separated from the main control valve 4 to form a separate block (referring to a housing), the main control valve 4 and the variable relief valves 9 and 10 and the working device are The structure of the hydraulic pipe connecting the complicated to have a problem that increases the cost of manufacturing and assembling them.

In addition, the block of the variable relief valve (9, 10) is separated from the block of the main control valve (4) has a problem that the space is limited when mounting the main control valve (4) to the equipment.

In addition, when the variable relief valves 9 and 10 are additionally installed on the outside of the main control valve 4 in order to use the optional work tool 3, the number of corresponding parts is increased and the cost of the variable relief valve 9 is increased. , 10 can perform the function of the port relief valve (6, 7) installed in the main control valve (4) has a problem that the efficiency of the hydraulic system is inferior.

On the other hand, the equipment to which the hydraulic system is not equipped with the variable relief valve (9.10) according to the specification of the equipment is used by installing the port relief valve (6, 7) in the main control valve (4).

According to an embodiment of the present invention, the variable relief valve for varying the operating pressure of the optional work machine is installed inside the main control valve to simplify the hydraulic piping structure, so that the main control valve is not limited in space when the main control valve is mounted on the equipment. Related to heavy duty hydraulic circuits with built-in variable relief valves.

According to an embodiment of the present invention, since the variable relief valve and the port relief valve are united to perform the function of the port relief valve in the variable relief valve, the hydraulic circuit for heavy equipment having a built-in variable relief valve to improve the efficiency of the hydraulic system. Related to.

Hydraulic circuit for heavy equipment having a built-in variable relief valve according to an embodiment of the present invention, the variable displacement hydraulic pump,

A main relief valve installed upstream of the discharge flow path of the hydraulic pump;

With the optional work machine connected to the hydraulic pump,

A main control valve installed in the flow path between the hydraulic pump and the optional worker, and including a spool for the optional worker for controlling the start, stop, and direction change of the optional worker;

It is installed inside the main control valve, and includes a variable relief valve to variably adjust the relief pressure required for the optional work in accordance with the input of the electrical signal from the outside.

The above-described variable relief valve uses an electromagnetic proportional valve to variably adjust the relief pressure to correspond to the current value input from the controller to the signal pressure unit.

The above-described variable relief valve can variably adjust the relief pressure in inverse proportion to the current value input from the controller to the signal pressure unit.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings, which are intended to explain in detail enough to enable those skilled in the art to easily carry out the invention, and thus It does not mean that the technical spirit and scope of the invention are limited.

As shown in Figure 2, the hydraulic circuit for heavy equipment having a built-in variable relief valve according to an embodiment of the present invention, at least one variable displacement hydraulic pump (1),

A main relief valve 2 provided upstream of the discharge flow path of the hydraulic pump 1,

An optional work machine 3 (hammer, etc.) connected to the hydraulic pump 1,

The main control valve (MCV) (4) installed in the flow path between the hydraulic pump (1) and the optional work tool (3) and including a spool (5) for the optional work tool for controlling the start, stop and redirection of the optional work tool (3). )Wow,

Variable relief valves 14 and 15 which are installed inside the main control valve 4 and variably adjust the relief pressure required for the optional work machine 3 according to the input of electrical signals from the controller 8 (V-ECU). It includes.

The above-described variable relief valves 14 and 15 may be electronic proportional valves so as to variably adjust the relief pressure to correspond to the current value input from the controller 8 to the signal pressure receiving unit.

On the other hand, the variable relief valves 14 and 15 can variably adjust the relief pressure in inverse proportion to the current value input from the controller 8 to the signal pressure unit.

At this time, the configuration except for the variable relief valves 14 and 15 installed inside the main control valve 4 and variably adjusting the relief pressure of the replaced optional work machine is substantially the same as the description of the embodiment shown in FIG. Since they are applied equally, detailed description thereof will be omitted, and overlapping reference numerals will be denoted the same.

Hereinafter, with reference to the accompanying drawings an example of the use of the hydraulic circuit for heavy equipment having a built-in variable relief valve according to an embodiment of the present invention.

As shown in FIG. 2, after the bucket is removed from the excavator and the optional work machine 3 (hammer, etc.) is mounted to perform the optional work according to the working conditions, the controller 8 is operated by the operation of the corresponding switch in the driver's seat. An electrical signal is input to the signal pressure section of the variable relief valves 14 and 15. The relief pressure corresponding to the current value input to the signal pressure receiving section is adjusted by the variable relief valves 14 and 15.

Therefore, the hydraulic oil discharged from the variable displacement hydraulic pump 1 is supplied to the option work machine 3 via the spool 5 for the option work machine of the main control valve 4. At this time, if an overload exceeding the set pressure of the variable relief valve (14, 15) occurs when the optional work machine (3) is driven, the hydraulic tank (16) part or all of the hydraulic oil via the variable relief valve (14, 15) To drain.

At this time, by installing the variable relief valve (14, 15) inside the main control valve (4), to simplify the structure of the hydraulic pipe connecting the main control valve (4) and the variable relief valve (14, 15). Can be.

In addition, since the function of the port relief valve is performed by the variable relief valves 14 and 15, the use of a separate port relief valve (shown in FIG. 1) is unnecessary. This can increase the efficiency of the hydraulic system.

As described above, the hydraulic circuit for heavy equipment having a built-in variable relief valve according to an embodiment of the present invention has the following advantages.

The variable relief valve that variably adjusts the working pressure of the optional machine can be installed inside the main control valve to simplify the hydraulic piping structure, so that the space can be efficiently utilized without being restricted by the equipment.

In addition, since the variable relief valve and the port relief valve unitized to perform the function of the port relief valve in the variable relief valve can improve the efficiency of the hydraulic system.

Claims (3)

Variable displacement hydraulic pump; A main relief valve installed upstream of the discharge flow path of the hydraulic pump; An optional work machine connected to the hydraulic pump; A main control valve installed in a flow path between the hydraulic pump and the optional work machine, the main control valve including a spool for the optional work machine for controlling the start, stop and direction change of the optional work machine; And It is installed inside the main control valve, the hydraulic pressure for heavy equipment with a built-in variable relief valve, characterized in that it comprises a variable relief valve for variably adjusting the relief pressure required for the option work in accordance with the input of an electrical signal from the outside Circuit. According to claim 1, The variable relief valve is a hydraulic oil for heavy equipment having a built-in variable relief valve, characterized in that the electronic proportional valve is used to variably adjust the relief pressure corresponding to the current value input to the signal pressure unit from the controller Circuit. The hydraulic circuit of claim 1, wherein the variable relief valve can variably adjust the relief pressure in inverse proportion to a current value input from the controller to the signal pressure unit.
KR1020070042099A 2007-04-30 2007-04-30 Hydraulic circuit of heavy equipment of having variable relief valve inner type KR20080097027A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020070042099A KR20080097027A (en) 2007-04-30 2007-04-30 Hydraulic circuit of heavy equipment of having variable relief valve inner type

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020070042099A KR20080097027A (en) 2007-04-30 2007-04-30 Hydraulic circuit of heavy equipment of having variable relief valve inner type

Publications (1)

Publication Number Publication Date
KR20080097027A true KR20080097027A (en) 2008-11-04

Family

ID=40285086

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020070042099A KR20080097027A (en) 2007-04-30 2007-04-30 Hydraulic circuit of heavy equipment of having variable relief valve inner type

Country Status (1)

Country Link
KR (1) KR20080097027A (en)

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E601 Decision to refuse application