CN204959857U - Hydraulic power assembly for excavator - Google Patents

Hydraulic power assembly for excavator Download PDF

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Publication number
CN204959857U
CN204959857U CN201520598306.1U CN201520598306U CN204959857U CN 204959857 U CN204959857 U CN 204959857U CN 201520598306 U CN201520598306 U CN 201520598306U CN 204959857 U CN204959857 U CN 204959857U
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CN
China
Prior art keywords
oil circuit
hydraulic pump
hydraulic
oil
proportioning valve
Prior art date
Legal status (The legal status 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 status listed.)
Expired - Fee Related
Application number
CN201520598306.1U
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Chinese (zh)
Inventor
刘林
秦绪鑫
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Linde Hydraulics China Co Ltd
Original Assignee
Weichai Power Co Ltd
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 Weichai Power Co Ltd filed Critical Weichai Power Co Ltd
Priority to CN201520598306.1U priority Critical patent/CN204959857U/en
Application granted granted Critical
Publication of CN204959857U publication Critical patent/CN204959857U/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Abstract

The utility model discloses a hydraulic power assembly for excavator, including the transfer case by engine driven, being connected with the first hydraulic pump that links to each other with first oil circuit on the transfer case, first oil circuit is connected with bucket cylinder, boom cylinder, arm cylinder and walking motor, all is equipped with valve unit between bucket cylinder, boom cylinder, arm cylinder and walking motor and the first oil circuit, be connected with the second hydraulic pump on the transfer case, the second hydraulic pump passes through the continuous closed loop that just forms of second oil circuit and third oil circuit and gyration motor between them, the last hydraulic pump administrative unit that is used for controlling second hydraulic pump discharge capacity size that still is equipped with of closed loop, and the hydraulic pump administrative unit links to each other with operating handle. Realize two hydraulic pumps fuel feeding respectively, reduced the number of case debugging, reduced the debugging degree of difficulty, reduce the loss and the oil consumption of hydraulic oil flow resistance through closed loop, avoided the spill losses, improved the fuel economy and the work efficiency of complete machine.

Description

A kind of excavator hydraulic power assembly
Technical field
The utility model belongs to excavator technical field, particularly relates to a kind of excavator hydraulic power assembly.
Background technology
As shown in Figure 1, existing excavator hydraulic power assembly comprises the oil circuit 2 be connected with hydraulic pump 1, this hydraulic pump 1 is driven by motor 9, this oil circuit 2 is connected with boom cylinder 3, bucket arm cylinder 4, bucket cylinder 5, running motor 6 and rotary motor 7, this oil circuit 2 and be equipped with control valve group 8 between boom cylinder 3, bucket arm cylinder 4, bucket cylinder 5, running motor 6 and rotary motor 7.
At work, manipulation operations handle the displacement of stirring according to driver, export the controlled pressure be directly proportional with it, this controlled pressure arrives corresponding control valve group 8 two ends by oil circuit 2, and valve core opening area is directly proportional to controlled pressure.Therefore the high-voltage oil liquid that hydraulic pump 1 produces arrives corresponding executive component (boom cylinder 3, bucket arm cylinder 4, bucket cylinder 5, running motor 6 and rotary motor 7) through oil circuit 2.Such as when handle upwards pushes away, the left position of reversal valve 801 in the control valve group 8 be connected with bucket arm cylinder 4 spool that controlled pressure that upwards pushing handle produces promotes reversal valve 801 that communicates moves right, realize bucket arm cylinder 4 to connect with hydraulic oil, dipper just moves upward, otherwise moves downward.
But, there is following defect in employing such scheme:
(1) hydraulic oil that hydraulic pump 1 produces transmits through oil circuit 2, and distributed as required by each control valve group, that is: the hydraulic oil of everything is all through control valve group, and drag losses is large, and oil consumption is high, less economical;
(2) when composite move (that is: multiple executive component needs action simultaneously), a hydraulic pump is to 4 executive components (comprising boom cylinder 3, bucket arm cylinder 4, bucket cylinder 5, rotary motor 7) fuel feeding, in order to obtain good coordination, need the curve simultaneously regulating spool in 4 control valve groups 8, debugging difficulty is large;
(3) when revolution action, in startup and stopped process, through control valve group, inevitably there is overflow in hydraulic oil, and then causes energy loss.
Utility model content
The purpose of this utility model is to provide a kind of excavator hydraulic power assembly, reaches the object reducing debugging difficulty, improve excavator operation efficiency and economy.
For solving the problems of the technologies described above, the technical solution of the utility model is: a kind of excavator hydraulic power assembly, comprise transfer case driven by the engine, described transfer case is connected with the first hydraulic pump be connected with the first oil circuit, described first oil circuit is connected with bucket cylinder, boom cylinder, bucket arm cylinder and running motor, is equipped with control valve group between described bucket cylinder, described boom cylinder, described bucket arm cylinder and described running motor and described first oil circuit;
Described transfer case is also connected with the second hydraulic pump, described second hydraulic pump is connected with rotary motor with the 3rd oil circuit by the second oil circuit, described second hydraulic pump, described second oil circuit, described 3rd oil circuit and described rotary motor form closed circuit, described closed circuit is also provided with the hydraulic pump administrative unit for controlling described second hydraulic pump discharge size, described hydraulic pump administrative unit is connected with operating grip.
Improve as one, described hydraulic pump administrative unit comprises the first hydraulic jack controlled by described operating grip, described first hydraulic jack is connected with the three position four-way directional control valve with described first hydraulic jack synchronization action, the oil-in of described three position four-way directional control valve is connected with slippage pump, and the oil return opening of described three position four-way directional control valve is communicated with fuel tank;
Two actuator ports of described three position four-way directional control valve are connected with the second hydraulic jack be connected with described second hydraulic pump;
Described hydraulic pump administrative unit also comprises the first proportioning valve be connected with described second oil circuit and the second proportioning valve be connected with described 3rd oil circuit, the oil return opening of described first proportioning valve is all communicated with described fuel tank by the 4th oil circuit with the oil return opening of described second proportioning valve, and the oil-in of described first proportioning valve is all connected with described first hydraulic jack with the oil-in of described second proportioning valve.
As further improvement, described first proportioning valve and described second proportioning valve are equipped with flexible member.
As further improving, between described second oil circuit and described 3rd oil circuit, be provided with overflow valve.
Owing to have employed technique scheme, the beneficial effect of a kind of excavator hydraulic power assembly provided by the utility model is:
Because the second hydraulic pump, the second oil circuit, the 3rd oil circuit form closed circuit mutually with rotary motor, thus at work, first hydraulic pump is to bucket cylinder, boom cylinder, bucket arm cylinder and running motor fuel feeding, second hydraulic pump is directly to rotary motor fuel feeding, decrease the number of spool debugging, reduce debugging difficulty; Meanwhile, decreased loss and the oil consumption of running of hydraulic power oil resistance by closed circuit, improve fuel economy and the operating efficiency of complete machine, and, tradition is compared, and avoids spill losses, improves the response time, the energy that second hydraulic pump produces also all obtains utilization, further increase operating efficiency, in addition, achieve two hydraulic pumps fuel feeding respectively, oil mass is more sufficient, for the operating efficiency improving complete machine provides condition; Because closed circuit is provided with hydraulic pump administrative unit, thus control the size of the second hydraulic pump discharge by hydraulic pump administrative unit, realize all-hydraulic control, without the need to automatically controlled participation, improve functional reliability, and cost is low.
Comprise the first hydraulic jack due to hydraulic pump administrative unit and be connected and the three position four-way directional control valve of synchronization action with the first hydraulic jack, thus operationally, operating grip drives the first hydraulic jack and three position four-way directional control valve synchronization action, then slippage pump fuel feeding, if three position four-way directional control valve is in left position, fluid enters the left chamber of the second hydraulic jack and pressure raises, and now the second hydraulic pump turns left, otherwise turns right.Adopts this structure, further avoid overflow, and structure is simple, for realizing all-hydraulic control, without the need to automatically controlled participation and reliable in action lay the foundation.
Because hydraulic pump administrative unit also comprises to be connected with the second oil circuit the first proportioning valve and second proportioning valve that is connected with the 3rd oil circuit, the oil-in of the first proportioning valve is all connected with the first hydraulic jack with the oil-in of the second proportioning valve, thus at work, if starting pressure is excessive, then the first proportioning valve and the second proportioning valve action overflow, serves safeguard protection effect during startup; Meanwhile, it also avoid operating grip movement range by the first proportioning valve and the second proportioning valve excessive, pressure sharply raises, and drives the second hydraulic pump to produce the problem of impact force.
Due to the first proportioning valve and the second proportioning valve being equipped with flexible member, thus not only serve reset response by flexible member, and according to the elastic force of requirements of one's work adjustable elastic element, the pressure of closed circuit can be regulated.
Accompanying drawing explanation
Fig. 1 is the hydraulic schematic diagram of existing excavator hydraulic power assembly;
Fig. 2 is hydraulic schematic diagram of the present utility model;
In figure, 1-hydraulic pump; 101-first hydraulic pump; 102-second hydraulic pump; 2-oil circuit; 201-first oil circuit; 202-second oil circuit; 203-the 3rd oil circuit; 204-the 4th oil circuit; 3-boom cylinder; 4-bucket arm cylinder; 5-bucket cylinder; 6-running motor; 7-rotary motor; 8-control valve group; 801-solenoid operated directional valve; 802-overflow valve; 9-motor; 10-transfer case; 11-hydraulic pump administrative unit; 111-first hydraulic jack; 112-three position four-way directional control valve; 113-second hydraulic jack; 114-first proportioning valve; 115-second proportioning valve; 116-flexible member; 12-overflow valve; 13-slippage pump; 14-fuel tank; 15-one way valve.
Detailed description of the invention
In order to make the purpose of this utility model, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.
As shown in Figure 2, a kind of excavator hydraulic power assembly, comprise the transfer case 10 driven by motor 9, this transfer case 10 is connected with the first hydraulic pump 101 be connected with the first oil circuit 201, this first oil circuit 201 is connected with bucket cylinder 5, boom cylinder 3, bucket arm cylinder 4 and running motor 6, is equipped with control valve group 8 (being made up of conventional solenoid operated directional valve 801 on present stage excavator and overflow valve 802) between this bucket cylinder 5, boom cylinder 3, bucket arm cylinder 4 and running motor 6 and the first oil circuit 201; This transfer case 10 being also connected with the second hydraulic pump 102, in order to reduce axial dimension, improving Installation Flexibility, this second hydraulic pump 102 and the first hydraulic pump 101 walk abreast and install; This second hydraulic pump 102 is connected with rotary motor 7 with the 3rd oil circuit 203 by the second oil circuit 202, this the second hydraulic pump 102, second oil circuit 202, the 3rd oil circuit 203 form closed circuit mutually with rotary motor 7, are provided with at least one overflow valve 12 between this second oil circuit 202 and the 3rd oil circuit 203; This closed circuit is also provided with the hydraulic pump administrative unit 11 for controlling the second hydraulic pump 102 displacement size, this hydraulic pump administrative unit 11 is connected with operating grip.
This hydraulic pump administrative unit 11 comprises the first hydraulic jack 111 controlled by operating grip, this first hydraulic jack 111 is connected with the three position four-way directional control valve 112 with the first hydraulic jack 111 synchronization action, the oil-in of this three position four-way directional control valve 112 is connected with slippage pump 13, and the oil return opening of this three position four-way directional control valve 112 is communicated with fuel tank 14; Two actuator ports of this three position four-way directional control valve 112 are connected with the second hydraulic jack 113 be connected with the second hydraulic pump 102.
This hydraulic pump administrative unit 11 also comprises the first proportioning valve 114 be connected with the second oil circuit 202 and the second proportioning valve 115 be connected with the 3rd oil circuit 203, the oil return opening of this first proportioning valve 114 is all communicated with fuel tank 14 by the 4th oil circuit 204 with the oil return opening of the second proportioning valve 115, and the 4th oil circuit 204 is provided with one way valve 15; The oil-in of this first proportioning valve 114 is all connected with the first hydraulic jack 111 with the oil-in of the second proportioning valve 115.When the second oil circuit 202 or the 3rd oil circuit 203 exceed setup pressure value, oil pressure meeting conducting first proportioning valve 114 or the second proportioning valve 115, reduce the pilot pressure value in the first hydraulic jack 111, reduce the discharge capacity of the second hydraulic pump 102 thus, regulate the operating pressure of closed circuit thus, avoid the second oil circuit 202 or the 3rd oil circuit 203 that spill losses occurs.
This first proportioning valve 114 and the second proportioning valve 115 are equipped with flexible member 116, this flexible member 116 is spring, also can for can realize other elements of spring function as those skilled in the art, thus not only serve reset response by flexible member 116, and can according to the elastic force of requirements of one's work adjustable elastic element 116.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all do within spirit of the present utility model and principle any amendment, equivalent to replace and improvement etc., all should be included within protection domain of the present utility model.

Claims (4)

1. an excavator hydraulic power assembly, it is characterized in that, comprise the transfer case (10) driven by motor (9), described transfer case (10) is connected with the first hydraulic pump (101) be connected with the first oil circuit (201), described first oil circuit (201) is connected with bucket cylinder (5), boom cylinder (3), bucket arm cylinder (4) and running motor (6), described bucket cylinder (5), described boom cylinder (3), described bucket arm cylinder (4) and be equipped with control valve group (8) between described running motor (6) and described first oil circuit (201),
Described transfer case (10) is also connected with the second hydraulic pump (102), described second hydraulic pump (102) is connected with rotary motor (7) with the 3rd oil circuit (203) by the second oil circuit (202), described second hydraulic pump (102), described second oil circuit (202), described 3rd oil circuit (203) and described rotary motor (7) form closed circuit, described closed circuit is also provided with the hydraulic pump administrative unit (11) for controlling described second hydraulic pump (102) displacement size, described hydraulic pump administrative unit (11) is connected with operating grip.
2. a kind of excavator hydraulic power assembly according to claim 1, it is characterized in that, described hydraulic pump administrative unit (11) comprises the first hydraulic jack (111) controlled by described operating grip, described first hydraulic jack (111) is connected with the three position four-way directional control valve (112) with described first hydraulic jack (111) synchronization action, the oil-in of described three position four-way directional control valve (112) is connected with slippage pump (13), and the oil return opening of described three position four-way directional control valve (112) is communicated with fuel tank (14);
Two actuator ports of described three position four-way directional control valve (112) are connected with the second hydraulic jack (113) be connected with described second hydraulic pump (102);
Described hydraulic pump administrative unit (11) also comprises the first proportioning valve (114) be connected with described second oil circuit (202) and the second proportioning valve (115) be connected with described 3rd oil circuit (203), the oil return opening of described first proportioning valve (114) is all communicated with described fuel tank (14) by the 4th oil circuit (204) with the oil return opening of described second proportioning valve (115), and the oil-in of described first proportioning valve (114) is all connected with described first hydraulic jack (111) with the oil-in of described second proportioning valve (115).
3. a kind of excavator hydraulic power assembly according to claim 2, is characterized in that, described first proportioning valve (114) and described second proportioning valve (115) are equipped with flexible member (116).
4. a kind of excavator hydraulic power assembly according to the arbitrary claim of claim 1-3, is characterized in that, is provided with overflow valve (12) between described second oil circuit (202) and described 3rd oil circuit (203).
CN201520598306.1U 2015-08-10 2015-08-10 Hydraulic power assembly for excavator Expired - Fee Related CN204959857U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201520598306.1U CN204959857U (en) 2015-08-10 2015-08-10 Hydraulic power assembly for excavator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201520598306.1U CN204959857U (en) 2015-08-10 2015-08-10 Hydraulic power assembly for excavator

Publications (1)

Publication Number Publication Date
CN204959857U true CN204959857U (en) 2016-01-13

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN201520598306.1U Expired - Fee Related CN204959857U (en) 2015-08-10 2015-08-10 Hydraulic power assembly for excavator

Country Status (1)

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CN (1) CN204959857U (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109563694A (en) * 2016-08-12 2019-04-02 卡特彼勒公司 The closed-loop control of swing
CN111485590A (en) * 2020-05-28 2020-08-04 三一重机有限公司 Hydraulic control system, excavator and excavator control method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109563694A (en) * 2016-08-12 2019-04-02 卡特彼勒公司 The closed-loop control of swing
CN109563694B (en) * 2016-08-12 2020-08-21 卡特彼勒公司 Closed loop control of swing
CN111485590A (en) * 2020-05-28 2020-08-04 三一重机有限公司 Hydraulic control system, excavator and excavator control method

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Legal Events

Date Code Title Description
C14 Grant of patent or utility model
GR01 Patent grant
TR01 Transfer of patent right

Effective date of registration: 20170424

Address after: 261061 Shandong city in Weifang province Fu hi tech Industrial Development Zone, No. 169 East Street

Patentee after: LINDE HYDRAULICS (CHINA) Co.,Ltd.

Address before: 261061 Shandong city in Weifang province Fu hi tech Industrial Development Zone, East Street No. 197

Patentee before: WEICHAI POWER Co.,Ltd.

TR01 Transfer of patent right
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20160113

CF01 Termination of patent right due to non-payment of annual fee