CN108644082B - Embedded miniature variable displacement pump for electrohydraulic servo mechanism - Google Patents
Embedded miniature variable displacement pump for electrohydraulic servo mechanism Download PDFInfo
- Publication number
- CN108644082B CN108644082B CN201810670399.2A CN201810670399A CN108644082B CN 108644082 B CN108644082 B CN 108644082B CN 201810670399 A CN201810670399 A CN 201810670399A CN 108644082 B CN108644082 B CN 108644082B
- Authority
- CN
- China
- Prior art keywords
- plunger
- pump
- pressure
- cylinder body
- transmission shaft
- 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.)
- Active
Links
- 238000006073 displacement reaction Methods 0.000 title claims description 9
- 230000005540 biological transmission Effects 0.000 claims abstract description 23
- 238000007789 sealing Methods 0.000 claims abstract description 9
- 230000000149 penetrating effect Effects 0.000 claims abstract description 4
- 239000003921 oil Substances 0.000 claims description 17
- 239000010720 hydraulic oil Substances 0.000 claims description 8
- 230000007423 decrease Effects 0.000 claims description 4
- 238000010521 absorption reaction Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 2
- 230000033228 biological regulation Effects 0.000 claims 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
- F04B1/14—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis having stationary cylinders
- F04B1/16—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis having stationary cylinders having two or more sets of cylinders or pistons
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
- F04B1/14—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis having stationary cylinders
- F04B1/141—Details or component parts
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
- F04B1/26—Control
- F04B1/28—Control of machines or pumps with stationary cylinders
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/10—Valves; Arrangement of valves
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Reciprocating Pumps (AREA)
Abstract
The invention discloses an embedded type miniature variable pump for an electrohydraulic servo mechanism, which is positioned in a mounting hole of the electrohydraulic servo mechanism and is connected with the mounting hole in a sealing way through a sealing ring; the embedded miniature variable pump is a cylinder formed by connecting a swash plate component and a plunger component through threads; the swash plate assembly includes a housing; a transmission shaft penetrating through the shell is arranged in the shell and is rotationally connected with the shell through a bearing; the transmission shaft is connected with a transmission hole of the sloping cam plate through a pin shaft, and the sloping surface of the sloping cam plate is provided with a distribution groove; the lower end of the transmission shaft is connected with a return disc through a ball sleeve, and sliding shoes uniformly distributed along the circumference are arranged on the return disc; the top surface of the sliding shoe is in sliding connection with the inclined surface of the sloping cam plate; the plunger assembly comprises a cylinder; plunger holes uniformly distributed along the circumference are formed in the top surface of the cylinder body, and plungers are arranged in the plunger holes; the bottom of the plunger is provided with a one-way valve. The invention has small volume and light weight, and improves the specific power level of the variable pump.
Description
Technical Field
The invention relates to an embedded miniature variable pump for an electrohydraulic servo mechanism, belonging to the technical field of miniature plunger pumps.
Background
The electrohydraulic servo mechanism is a control device which is arranged on the aircraft and is used for controlling the flight attitude of the aircraft. Thus, the volume and weight of the electrohydraulic servo directly affect the performance of the aircraft. The variable displacement pump is the main component in the electrohydraulic servo mechanism.
The existing commercial variable pump is large in size and can only be connected with the electrohydraulic servo mechanism in a flange connection plug-in mode, and the reliability of products is difficult to improve due to the fact that the sealing positions of the plug-in connection mode are more.
Disclosure of Invention
The invention aims to provide an embedded miniature variable pump for an electrohydraulic servo mechanism, which enables the variable pump to be directly integrated in a mounting hole of the electrohydraulic servo mechanism, reduces pipeline connection between the variable pump and the electrohydraulic servo mechanism, enables the overall structure of the electrohydraulic servo mechanism to be more compact, realizes the aim of lightening and miniaturizing the electrohydraulic servo mechanism, and improves the reliability of the electrohydraulic servo mechanism at the same time, thereby overcoming the defects in the prior art.
In order to achieve the above purpose, the invention adopts the following technical scheme:
The embedded type miniature variable pump for the electrohydraulic servo mechanism is positioned in the mounting hole of the electrohydraulic servo mechanism, and the embedded type miniature variable pump is connected with the mounting hole in a sealing way through the sealing ring, so that the shell of the traditional variable pump is omitted; the embedded miniature variable pump is a cylinder formed by connecting a swash plate component and a plunger component through threads; the swash plate assembly comprises a shell, a transmission shaft penetrating through the shell is arranged in the shell, and the transmission shaft is rotationally connected with the shell through a bearing; the transmission shaft is connected with a transmission hole of the sloping cam plate through a pin shaft, and the sloping surface of the sloping cam plate is provided with a distribution groove; the lower end of the transmission shaft is connected with a return disc through a ball sleeve, and sliding shoes uniformly distributed along the circumference are arranged on the return disc; the top surface of the sliding shoe is in sliding connection with the inclined surface of the sloping cam plate; the plunger assembly comprises a cylinder; plunger holes uniformly distributed along the circumference are formed in the top surface of the cylinder body, and plungers are arranged in the plunger holes; the bottom of the plunger is provided with a one-way valve.
In the embedded miniature variable displacement pump, the center of the cylinder body is provided with a center hole, and a variable displacement adjusting mechanism consisting of a spring, a valve core and a valve sleeve is arranged in the center hole to realize the flow adjustment of the pump.
In the embedded miniature variable pump, the distribution groove is a circular arc groove, and the circular arc angle is smaller than 180 degrees.
In the embedded miniature variable pump, a through hole is arranged in the middle of the sliding shoe, and a spherical cavity is arranged in the through hole.
In the embedded miniature variable pump, the plunger is of a tubular structure, one end of the tubular structure is in a ball shape, and the ball of the plunger is in sliding connection with the spherical cavity of the sliding shoe.
Compared with the prior art, the invention has the advantages that the mounting hole is additionally formed in the shell at the driving shaft of the electrohydraulic servo mechanism, the embedded miniature variable pump is arranged in the mounting hole, the shell of the traditional variable pump is omitted, the number of parts is reduced, the variable pump is smaller in size and lighter in weight, and the processing cost of the variable pump is reduced. Because the variable pump is directly integrated on the electrohydraulic servo mechanism, the pipeline connection and the joint can be reduced, the tightness of the connection between the variable pump and the electrohydraulic servo mechanism is greatly improved, and the reliability of the electrohydraulic servo mechanism is improved.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is an isometric view of FIG. 1;
FIG. 3 is a schematic structural view of a plunger assembly;
FIG. 4 is a schematic illustration of a distribution groove on a swash plate;
fig. 5 is an isometric view of a swash plate.
Marked in the figure as: 1-valve sleeve, 2-valve core, 3-cylinder body, 4-check valve, 5-plunger, 6-spring, 7-ball sleeve, 8-slipper, 9-sloping cam plate, 10-bearing, 11-round pin axle, 12-shell, 13-transmission shaft, 14-return disc, 15-distributing groove.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples.
The embedded type miniature variable pump for the electrohydraulic servo mechanism is positioned in the mounting hole of the electrohydraulic servo mechanism, and the embedded type miniature variable pump is connected with the mounting hole in a sealing way through the sealing ring, so that the shell of the traditional variable pump is omitted; as shown in fig. 1, the embedded miniature variable pump is a cylinder formed by connecting two parts of a swash plate assembly and a plunger assembly through threads; the swash plate assembly comprises a shell 12, a transmission shaft 13 penetrating through the shell 12 is arranged in the shell 12, and the transmission shaft 13 is rotatably connected with the shell 12 through a bearing 10; the transmission shaft 13 is connected with a transmission hole of the swash plate 9 through a pin shaft 11, and a distribution groove 15 is arranged on the inclined surface of the swash plate 9; the lower end of the transmission shaft 13 is connected with a return disc 14 through a ball sleeve 7, and sliding shoes 8 uniformly distributed along the circumference are arranged on the return disc 14; the top surface of the sliding shoe 8 is in sliding connection with the inclined surface of the inclined plate 9; the plunger assembly comprises a cylinder 3; the top surface of the cylinder body 3 is provided with plunger holes uniformly distributed along the circumference, and plungers 5 are arranged in the plunger holes; the bottom of the plunger 5 is provided with a one-way valve 4. The center of the cylinder body 3 is provided with a center hole, and a variable adjusting mechanism of the pump consisting of a spring 6, a valve core 2 and a valve sleeve 1 is arranged in the center hole, so that the flow of the pump is adjusted. The distribution groove 15 is a circular arc groove, and the circular arc angle is smaller than 180 degrees. A through hole is arranged in the middle of the sliding shoe 8, and a spherical cavity is arranged in the through hole. The plunger 5 is of a tubular structure, one end of the tubular structure is in a ball head shape, and the ball head of the plunger 5 is in sliding connection with the spherical cavity of the sliding shoe 8.
Examples
This is illustrated in fig. 1 and 2, for example. Mainly comprises a cylinder body 3, a sloping cam plate 5, a return disc 14, a transmission shaft 13, a plunger 5, a spring, a bearing 10 and the like.
The flow distribution of the embedded miniature variable-speed pump is completed by the flow distribution groove 15 on the swash plate 9, the plunger 5 and the one-way valve 4 in the cylinder body 3. When the transmission shaft 13 drives the swash plate 9 to rotate, the cylinder block 3 is fixed because the swash plate 9 is obliquely arranged, and the plunger 5 is driven by the swash plate 9 to do reciprocating linear motion in the plunger hole of the cylinder block 3. When the plunger 5 extends outwards, the plunger 5 is just positioned at one side of the swash plate 9 where the distributing groove 15 is arranged, and the plunger 5 enters the oil suction stroke. The oil inlet on the sliding shoe 8 is communicated with a distributing groove 15 on the oil suction area of the swash plate 9, and hydraulic oil enters the plunger cavity through the channel. At this time, the check valve 4 is in a closed state by the hydraulic force and the spring force. When the plunger 5 is compressed into the cylinder body 3, the plunger 5 is just positioned on the side of the swash plate 9 without the distributing groove 15, and enters the oil discharge stroke. At this time, since the swash plate 9 is not provided with a runner, the surface of the swash plate 9 blocks the oil hole on the shoe 8, thereby forming a sealed chamber composed of the plunger 5, the shoe 8 and the swash plate 9. Along with the continuous rotation of the transmission shaft 13, the plunger 5 continuously moves, the pressure of hydraulic oil in the plunger cavity continuously rises, and when the pressure reaches the opening pressure of the one-way valve 4, the one-way valve 4 in the cylinder body 3 is opened, and the embedded miniature variable pump discharges high-pressure oil. The structure of the distributing groove 15 of the swashplate 9 is shown in fig. 4 and 5.
When the variable mechanism is not available, the embedded miniature variable pump can work independently, and the working state of the embedded miniature variable pump is a constant displacement pump. When the embedded miniature variable pump works together with the variable mechanism, the state of the embedded miniature variable pump is an oil absorption volume variable pump.
The embedded miniature variable displacement pump utilizes a pressure feedback throttle valve (variable mechanism) output by the pump to control the oil suction volume of the pump, so as to realize the oil suction volume variable of the plunger pump. The pump is fed back through the small hole on the valve sleeve 1 to act on the stepped surface of the valve core 2 to compare with the spring force, so as to control the opening size of the throttle orifice, thereby controlling the oil absorption flow of the pump and achieving the purpose of controlling the variable of the embedded miniature variable-speed pump.
The variable mechanism is a direct-acting throttle valve structure, and as shown in fig. 1-3, mainly comprises a valve core 2, a valve sleeve 1, a spring 6 and the like in a cylinder body 3. The variable pump and the variable mechanism realize an embedded installation structure, when the output flow of the variable pump is too large, the system pressure Ps is increased, the pump outlet pressure Ps can overcome the set pressure of the spring 6, the spring 6 starts to compress, the valve core 2 is pushed to move upwards, the valve port flow area on the valve core 2 starts to decrease, and hydraulic oil flowing into the cylinder body 3 also decreases. When the system pressure reaches the zero flow pressure point, the valve port of the control valve core 2 is completely closed, at the moment, no hydraulic oil enters the cylinder body 3, the cylinder body 3 is in a vacuum state, and at the moment, the output flow of the pump is zero, so that the working pressure of the pump is reduced. When the hydraulic pressure on the stepped surface of the valve core 2 is just equal to the pretightening force of the spring 6, the valve core 2 stops moving, the variable process is finished, and the working pressure of the pump is stabilized at a set value. Similarly, if the system pressure drops, the variable mechanism increases the output flow of the pump, and the working pressure rises to the set value. The variable point pressure of the pump can be adjusted by adjusting the pretightening force of the spring 6.
Claims (2)
1. An embedded miniature variable displacement pump for an electrohydraulic servo mechanism, which is characterized in that: the embedded miniature variable pump is positioned in the mounting hole of the electrohydraulic servo mechanism and is connected with the mounting hole in a sealing way through the sealing ring; the embedded miniature variable pump is a cylinder formed by connecting a swash plate component and a plunger component through threads; the swash plate assembly includes a housing (12); a transmission shaft (13) penetrating through the shell (12) is arranged in the shell (12), and the transmission shaft (13) is rotationally connected with the shell (12) through a bearing (10); the transmission shaft (13) is connected with a transmission hole of the sloping cam plate (9) through the distribution shaft (11), and a distribution groove (15) is arranged on the sloping surface of the sloping cam plate (9); the lower end of the transmission shaft (13) is connected with a return disc (14) through a ball head sleeve (7), and sliding shoes (8) uniformly distributed along the circumference are arranged on the return disc (14); the top surface of the sliding shoe (8) is in sliding connection with the inclined surface of the sloping cam plate (9); the plunger assembly comprises a cylinder body (3); plunger holes uniformly distributed along the circumference are formed in the top surface of the cylinder body (3), and plungers (5) are arranged in the plunger holes; the bottom of the plunger (5) is provided with a one-way valve (4); the center of the cylinder body (3) is provided with a center hole, and a variable mechanism of the pump, which is formed by a spring (6), a valve core (2) and a valve sleeve (1), is arranged in the center hole, so that the flow regulation of the pump is realized; a through hole is formed in the middle of the sliding shoe (8), and a spherical cavity is formed in the through hole; the plunger (5) is of a tubular structure, one end of the tubular structure is in a ball head shape, and the ball head of the plunger (5) is in sliding connection with the spherical cavity of the sliding shoe (8); when the plunger (5) stretches outwards, the plunger (5) is just positioned at one side of the swash plate (9) provided with the distribution groove (15), and enters the oil suction stroke; an oil inlet on the sliding shoe (8) is communicated with a distributing groove (15) on an oil suction area of the swash plate (9), hydraulic oil enters the plunger cavity through the channel, and at the moment, the one-way valve (4) is in a closed state under the action of hydraulic force and spring force; when the plunger (5) is compressed into the cylinder body (3), the plunger (5) is just positioned at one side of the swash plate (9) without the distributing groove (15), and enters an oil discharge stroke; at the moment, as the inclined plate (9) is not provided with a launder, the surface of the inclined plate (9) blocks the oil hole on the sliding shoe (8), thereby forming a sealed cavity consisting of the plunger (5), the sliding shoe (8) and the inclined plate (9); along with the continuous rotation of the transmission shaft (13), the plunger (5) continuously moves, the pressure of hydraulic oil in a plunger cavity continuously rises, and when the pressure reaches the opening pressure of the one-way valve (4), the one-way valve (4) in the cylinder body (3) is opened, and the embedded miniature variable pump discharges high-pressure oil; the embedded miniature variable-pressure pump is fed back to act on the stepped surface of the valve core (2) through the small hole on the valve sleeve (1) and is compared with the spring force, so that the opening size of the valve port of the valve core (2) is controlled, and the oil absorption flow of the pump is controlled; when the output flow of the variable pump is overlarge, the pump pressure Ps is increased, and the pump outlet pressure Ps can overcome the set pressure of the spring (6), the spring (6) starts to compress, the valve core (2) is pushed to move upwards, the valve port flow area on the valve core (2) starts to decrease, and hydraulic oil flowing into the cylinder body (3) also decreases; when the system pressure reaches a zero flow pressure point, the valve port of the control valve core (2) is completely closed, at the moment, no hydraulic oil enters the cylinder body (3), the cylinder body (3) is in a vacuum state, and at the moment, the output flow of the pump is zero, so that the working pressure of the pump is reduced; when the hydraulic pressure on the stepped surface of the valve core (2) is just equal to the pretightening force of the spring (6), the valve core (2) stops moving, the variable process is finished, and the working pressure of the pump is stabilized at a set value.
2. An embedded miniature variable displacement pump for an electro-hydraulic servo according to claim 1, wherein: the distribution groove (15) is a circular arc groove, and the circular arc angle is smaller than 180 degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810670399.2A CN108644082B (en) | 2018-06-26 | 2018-06-26 | Embedded miniature variable displacement pump for electrohydraulic servo mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810670399.2A CN108644082B (en) | 2018-06-26 | 2018-06-26 | Embedded miniature variable displacement pump for electrohydraulic servo mechanism |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108644082A CN108644082A (en) | 2018-10-12 |
| CN108644082B true CN108644082B (en) | 2024-04-23 |
Family
ID=63753730
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810670399.2A Active CN108644082B (en) | 2018-06-26 | 2018-06-26 | Embedded miniature variable displacement pump for electrohydraulic servo mechanism |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108644082B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110067714B (en) * | 2019-03-13 | 2024-06-28 | 上海强田驱动技术有限公司 | Axial plunger pump or motor |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH269288A (en) * | 1948-12-31 | 1950-06-30 | Schweizerische Lokomotiv | Axial piston pump with variable delivery rate. |
| DE4029510A1 (en) * | 1989-09-18 | 1991-03-28 | Zahnradfabrik Friedrichshafen | Axial piston pump for driving dynamo - has regulating piston for rapid response to loading variations |
| CN1250846A (en) * | 1999-10-20 | 2000-04-19 | 李世六 | Axial plunger type hydraulic variable displacement pump or speed-variable motor |
| CN101081528A (en) * | 2006-06-02 | 2007-12-05 | 萱场工业株式会社 | Concrete agitating drum driving device |
| CN201096061Y (en) * | 2007-11-01 | 2008-08-06 | 卢堃 | 50Mpa self complementing type electrohydraulic proportional control axial plunger variable pump |
| CN204357643U (en) * | 2014-12-11 | 2015-05-27 | 浙江大学 | A kind of swash plate rotary internal Flat valve axial piston pump |
| CN208474054U (en) * | 2018-06-26 | 2019-02-05 | 贵州航天控制技术有限公司 | A kind of embedded micro variable pump of electrohydraudic servomechanism |
-
2018
- 2018-06-26 CN CN201810670399.2A patent/CN108644082B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH269288A (en) * | 1948-12-31 | 1950-06-30 | Schweizerische Lokomotiv | Axial piston pump with variable delivery rate. |
| DE4029510A1 (en) * | 1989-09-18 | 1991-03-28 | Zahnradfabrik Friedrichshafen | Axial piston pump for driving dynamo - has regulating piston for rapid response to loading variations |
| CN1250846A (en) * | 1999-10-20 | 2000-04-19 | 李世六 | Axial plunger type hydraulic variable displacement pump or speed-variable motor |
| CN101081528A (en) * | 2006-06-02 | 2007-12-05 | 萱场工业株式会社 | Concrete agitating drum driving device |
| CN201096061Y (en) * | 2007-11-01 | 2008-08-06 | 卢堃 | 50Mpa self complementing type electrohydraulic proportional control axial plunger variable pump |
| CN204357643U (en) * | 2014-12-11 | 2015-05-27 | 浙江大学 | A kind of swash plate rotary internal Flat valve axial piston pump |
| CN208474054U (en) * | 2018-06-26 | 2019-02-05 | 贵州航天控制技术有限公司 | A kind of embedded micro variable pump of electrohydraudic servomechanism |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108644082A (en) | 2018-10-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8360745B2 (en) | Air driven pump with performance control | |
| US20110116957A2 (en) | Reciprocating pump | |
| CN109469594B (en) | Continuous pressure regulating electro-hydraulic proportional axial plunger variable pump for aircraft hydraulic system | |
| CN108644083B (en) | A kind of ultrahigh pressure axial plunger pump of two-stage pressure output | |
| CA2754997C (en) | High pressure variable displacement piston pump | |
| US3712758A (en) | Variable displacement pump | |
| CN115898748B (en) | Radial plunger hydraulic device for controlling double-valve flow distribution by using single-group oil way and working method | |
| CN101504018B (en) | Lifting and steering hydraulic integrated valve with manual convenience | |
| CN108644082B (en) | Embedded miniature variable displacement pump for electrohydraulic servo mechanism | |
| CN108050029B (en) | Energy-saving efficient sloping cam plate type high-pressure plunger pump | |
| CN208474054U (en) | A kind of embedded micro variable pump of electrohydraudic servomechanism | |
| CN201739112U (en) | Swash plate type axial plunger pump with single control piston | |
| CN210422901U (en) | Low-pulsation axial plunger pump with flow adjustable from zero | |
| CN205260297U (en) | Hydraulic pressure booster pump | |
| CN108869223B (en) | Double-sloping cam plate plunger pump | |
| CN111237155A (en) | Through-shaft axial piston pump capable of realizing energy recovery | |
| CN111173699A (en) | Inclined disc type axial plunger pump with pressure protection aqueous medium | |
| US6655255B2 (en) | Swashplate arrangement for an axial piston pump | |
| CN110469475B (en) | Axial variable displacement plunger pump with pressure compensation device | |
| CN221347139U (en) | Constant power type axial plunger pump | |
| CN112483343A (en) | Low-pulsation axial plunger pump with unidirectional output and adjustable flow from zero | |
| CN104533740A (en) | Servo variable swash plate piston pump and control method thereof | |
| US3510232A (en) | Positive displacement pump | |
| CN116241426B (en) | Hydraulic system's oil pressure electric control mechanism and variable pump | |
| CN204371572U (en) | Servo variable displacement oblique plate plunger pump |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |