CN114439718A - Axial plunger pump variable device with locking function and swash plate type axial plunger pump - Google Patents
Axial plunger pump variable device with locking function and swash plate type axial plunger pump Download PDFInfo
- Publication number
- CN114439718A CN114439718A CN202210211461.8A CN202210211461A CN114439718A CN 114439718 A CN114439718 A CN 114439718A CN 202210211461 A CN202210211461 A CN 202210211461A CN 114439718 A CN114439718 A CN 114439718A
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- China
- Prior art keywords
- plunger pump
- axial plunger
- ball screw
- swash plate
- locking function
- 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.)
- Pending
Links
- 230000005540 biological transmission Effects 0.000 claims abstract description 9
- 230000007246 mechanism Effects 0.000 claims description 19
- 238000006073 displacement reaction Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000003921 oil Substances 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Images
Classifications
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- 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
- F04B1/29—Control of machines or pumps with stationary cylinders by varying the relative positions of a swash plate and a cylinder block
- F04B1/295—Control of machines or pumps with stationary cylinders by varying the relative positions of a swash plate and a cylinder block by changing the inclination of the swash plate
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- 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
- F04B1/30—Control of machines or pumps with rotary cylinder blocks
- F04B1/32—Control of machines or pumps with rotary cylinder blocks by varying the relative positions of a swash plate and a cylinder block
- F04B1/324—Control of machines or pumps with rotary cylinder blocks by varying the relative positions of a swash plate and a cylinder block by changing the inclination of the swash plate
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Reciprocating Pumps (AREA)
Abstract
The invention provides an axial plunger pump variable device with a locking function and a swash plate type axial plunger pump, and belongs to the field of plunger pumps. The variable device of the axial plunger pump realizes the accurate control of the inclination angle of the swash plate by utilizing the characteristics of the precision transmission of the ball screw and the precision driving of the servo motor, and realizes the accurate control of the variable of the swash plate type axial plunger pump when being applied to the swash plate type axial plunger pump.
Description
Technical Field
The invention belongs to the technical field of plunger pumps, and particularly relates to an axial plunger pump variable device with a locking function and a swash plate type axial plunger pump using the axial plunger pump variable device.
Background
The plunger pump is an important component device of a hydraulic system, changes the volume of a sealed working cavity to absorb and press oil by means of reciprocating motion of a plunger in a cylinder body, and has the advantages of high rated pressure, compact structure, high efficiency and the like.
According to the installation direction of the plunger, the plunger pump is divided into an axial plunger pump and a radial plunger pump. The plunger of the axial plunger pump is axially mounted, and the axial plunger pump has the advantages of compact structure, small radial size, small rotational inertia, high volumetric efficiency, low noise and small abrasion, can work at high speed and high pressure, and is widely applied to high-pressure systems.
Axial plunger pumps are classified into swash plate type and swash plate type. The swash plate type axial plunger pump controls the reciprocating stroke of the plunger by changing the size and the direction of the inclination angle of the swash plate through the variable mechanism, so that the output flow and the oil suction and discharge direction of the plunger pump are changed. The variable mode adopted by the traditional variable mechanism is mainly in the form of a valve control plunger, and because hydraulic oil has compressibility, accurate control is difficult to achieve when the variable is controlled.
Disclosure of Invention
The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide an axial plunger pump variable device with a lock function and a swash plate type axial plunger pump.
The invention provides an axial plunger pump variable device with a locking function, which is characterized by comprising a variable mechanism for adjusting the inclination angle of a swash plate and a driving device for driving the variable mechanism, wherein the variable mechanism comprises a ball screw, a flange plate and a driving pin, a nut of the ball screw is connected with the flange plate, the flange plate is connected with the driving pin, the driving pin is hinged with the swash plate, the driving device comprises a servo motor, and the servo motor is connected with a screw rod of the ball screw.
In the axial plunger pump variable device with the locking function provided by the invention, the axial plunger pump variable device can also have the following characteristics: the ball screw is a single-nut ball screw or a double-nut ball screw.
Preferably, the method further comprises the following steps: and the pre-tightening device is arranged on the ball screw and used for pre-tightening the nut of the ball screw.
Furthermore, when the ball screw is a double-nut ball screw, two nuts of the double-nut ball screw are respectively provided with a flange plate; the pre-tightening device comprises a piezoelectric stack, the piezoelectric stack is arranged between the two flange plates, and two ends of the piezoelectric stack are respectively connected with the two flange plates.
Furthermore, the number of the piezoelectric stacks is multiple, and the piezoelectric stacks are distributed on the peripheral side of the screw rod of the double-nut ball screw along the circumferential direction.
The invention also provides a swash plate type axial plunger pump which comprises the axial plunger pump variable device with the locking function.
Action and Effect of the invention
According to the axial plunger pump variable device with the locking function, compared with the prior art, the variable mechanism for adjusting the inclination angle of the swash plate adopts the ball screw, the driving device for driving the variable mechanism adopts the servo motor, and the characteristics of ball screw precision transmission and servo motor precision driving are utilized, so that the axial plunger pump variable device realizes the precise control of the inclination angle of the swash plate, and when the axial plunger pump variable device is applied to the swash plate type axial plunger pump, the precise control of the variable of the swash plate type axial plunger pump is realized.
Drawings
FIG. 1 is a front view of an axial piston pump variable displacement device with a locking function in an embodiment of the present invention;
FIG. 2 is a side view of an axial piston pump variable displacement device with a locking function in an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a mounting position of a pre-tightening device in an embodiment of the invention.
Description of reference numerals:
10 a swash plate; 20 variable displacement mechanisms; 21 a ball screw; 211 a screw; 212 a nut; 22 a flange plate; 23 drive pins; 30 a drive device; 31 a servo motor; 32 shaft couplings; 40 pre-tightening device; 41 piezoelectric stack.
Detailed Description
In order to make the technical means, the creation features, the achievement purposes and the effects of the invention easy to understand, the following embodiments are specifically described with reference to the attached drawings.
Examples
Fig. 1 is a front view of an axial plunger pump variable device with a locking function, and fig. 2 is a side view of the axial plunger pump variable device with the locking function.
The present embodiment provides a swash plate type axial plunger pump including an axial plunger pump variable device with a locking function, which is connected to a swash plate 10 for adjusting an inclination angle of the swash plate 10. The swash plate type axial plunger pump can be of a through shaft structure and also can be of a half shaft structure.
As shown in fig. 1 and 2, the variable device of the axial piston pump with the locking function comprises a variable mechanism 20 and a driving device 30.
The variable displacement mechanism 20 is connected to the swash plate 10 of the swash plate type axial piston pump for adjusting the inclination angle of the swash plate 10. The variable mechanism 20 comprises a ball screw 21, a flange plate 22 and a driving pin 23. The ball screw 21 includes a screw 211 and a nut 212, both ends of the screw 211 are respectively mounted on two mounting plates through bearings, and the two mounting plates are mounted in a housing of the swash plate type axial plunger pump. The flange 22 is fixedly connected to the nut 212 of the ball screw 21 by a bolt. The driving pin 23 is fixedly connected to the flange 22, and one end of the driving pin 23 is hinged with the swash plate 10.
The driving device 30 is connected with the variable mechanism 20 and drives the variable mechanism 20 to transmit power. The driving device 30 includes a servo motor 31, and an output shaft of the servo motor 31 is connected to one end of the ball screw 21 through a coupling 32.
When the output flow and the oil suction and discharge direction of the swash plate type axial plunger pump need to be changed, the servo motor 31 drives the nut 212 of the ball screw 21 to move along the screw 211, the nut 212 drives the swash plate 10 to rotate through the flange 22 and the transmission pin 23, and the size and the direction of the inclination angle of the swash plate 10 can be changed, so that the effective variable quantity of the working volume in the pump is changed, and the variable quantity of the swash plate type axial plunger pump is realized.
Further, the ball screw 21 may be a single nut ball screw or a double nut ball screw. Because there is certain axial clearance between ball 21's screw 211 and nut 212, ball 21 can produce the vibration in the course of the work, reduces transmission precision, and then can influence the control to swash plate 10, so, in this embodiment, ball 21 is preferably double nut ball, compares with single nut ball, has the great, stable strong, the high advantage of precision of load ratio.
The axial plunger pump variable device with the locking function further comprises a pre-tightening device 40, wherein the pre-tightening device 40 is installed on the ball screw 21 and used for pre-tightening a nut 212 of the ball screw 21 so as to eliminate an axial clearance.
FIG. 3 is a schematic diagram of the installation of the pretensioning device.
As shown in fig. 3, the present pretensioning device 40 is provided between two nuts 212 of a double nut ball screw, as for a double nut ball screw. The pretensioning device 40 comprises a plurality of piezoelectric stacks 41. The two nuts 212 of the double-nut ball screw are respectively provided with the flange plates 22, the piezoelectric stacks 41 are arranged between the two flange plates 22 and are uniformly distributed on the peripheral sides of the screw 211 along the circumferential direction, and the two ends of each piezoelectric stack 41 are respectively fixedly connected with the two flange plates 22 through screws. In the present embodiment, the number of the piezoelectric stacks 41 is four. When the device is used, the four piezoelectric stacks 41 are electrified, so that the thicknesses of the four piezoelectric stacks 41 in the axial direction are increased, the two flange plates 22 are pushed, the two nuts 212 are pressed on the screw 211, the balls inside each nut 212 are closer to the raceway, and the purpose of pre-tightening to eliminate the axial clearance is achieved.
Effects and effects of the embodiments
The axial plunger pump variable device with the locking function related to the embodiment adopts the ball screw as the variable mechanism for adjusting the inclination angle of the swash plate, adopts the servo motor as the driving device for driving the variable mechanism, and utilizes the characteristics of the ball screw precision transmission and the servo motor precision driving, so that the axial plunger pump variable device realizes the precise control of the inclination angle of the swash plate, and further realizes the precise control of the variable of the swash plate axial plunger pump when being applied to the swash plate axial plunger pump.
The ball screw can be a single-nut ball screw or a double-nut ball screw, preferably the double-nut ball screw, and has the advantages of large load, strong stability and high precision.
The ball screw is also provided with a pre-tightening device, and the nut is pre-tightened to eliminate the axial clearance. For a double-nut ball screw, the pre-tightening device adopts a piezoelectric stack and is arranged between two nuts. Through electrifying the piezoelectric stack, the thickness of the piezoelectric stack is increased, so that the two nuts are tightly pressed on the screw rod, the axial clearance is eliminated by pre-tightening, the transmission stability of the variable mechanism is improved, the system rigidity is improved, and the control precision is further improved. The number of the piezoelectric stacks can be multiple and is distributed on the peripheral side of the screw rod along the circumferential direction, and the stress balance of the two nuts is guaranteed.
The above embodiments are preferred examples of the present invention, and are not intended to limit the scope of the present invention.
Claims (6)
1. An axial plunger pump variable device with a locking function comprises a variable mechanism for adjusting the inclination angle of a swash plate and a driving device for driving the variable mechanism, and is characterized in that,
wherein the variable mechanism comprises a ball screw, a flange plate and a transmission pin, a nut of the ball screw is connected with the flange plate, the flange plate is connected with the transmission pin, the transmission pin is hinged with the swash plate,
the driving device comprises a servo motor, and the servo motor is connected with a screw rod of the ball screw.
2. The axial plunger pump variable device with locking function as claimed in claim 1, characterized in that:
the ball screw is a single-nut ball screw or a double-nut ball screw.
3. The axial plunger pump variable device with locking function as claimed in claim 2, characterized in that:
wherein, still include:
and the pre-tightening device is arranged on the ball screw and used for pre-tightening a nut of the ball screw.
4. The axial plunger pump variable device with locking function as claimed in claim 3, characterized in that:
when the ball screw is a double-nut ball screw, two nuts of the double-nut ball screw are respectively provided with one flange plate;
the pre-tensioning device comprises a piezoelectric stack,
the piezoelectric stack is arranged between the two flange plates, and two ends of the piezoelectric stack are respectively connected with the two flange plates.
5. The axial plunger pump variable device with locking function as claimed in claim 4, characterized in that:
the piezoelectric stacks are distributed on the periphery of the screw rod of the double-nut ball screw along the circumferential direction.
6. A swash plate type axial plunger pump, characterized by comprising the axial plunger pump variable device with locking function according to any one of claims 1 to 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210211461.8A CN114439718A (en) | 2022-02-28 | 2022-02-28 | Axial plunger pump variable device with locking function and swash plate type axial plunger pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210211461.8A CN114439718A (en) | 2022-02-28 | 2022-02-28 | Axial plunger pump variable device with locking function and swash plate type axial plunger pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114439718A true CN114439718A (en) | 2022-05-06 |
Family
ID=81360474
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210211461.8A Pending CN114439718A (en) | 2022-02-28 | 2022-02-28 | Axial plunger pump variable device with locking function and swash plate type axial plunger pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114439718A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6412173A (en) * | 1987-07-03 | 1989-01-17 | Honda Motor Co Ltd | Variable capacity type swash plate type hydraulic device |
| DE102010036096A1 (en) * | 2010-09-01 | 2012-03-01 | Gottfried Wilhelm Leibniz Universität Hannover | Ball screw drive has manually adjustable setting device, by which prestressing force is adjustable, where electrical clamping force sensor is provided for detecting prestressing force |
| CN203656087U (en) * | 2014-01-02 | 2014-06-18 | 上海理工大学 | Double-nut ball screw pair capable of accurately adjusting pre-tightening force |
| CN104565252A (en) * | 2015-01-30 | 2015-04-29 | 山东大学 | Dual-nut ball screw assembly with controllable pre-tightening force |
| CN104565253A (en) * | 2015-01-30 | 2015-04-29 | 山东大学 | Automatic pre-tightening device for double-nut ball screw pair |
| CN107061655A (en) * | 2016-11-02 | 2017-08-18 | 广东理工学院 | Ball guide screw nat and pre-tension method |
| CN110685879A (en) * | 2019-10-09 | 2020-01-14 | 太原理工大学 | Variable mechanism of oblique axis type plunger pump for continuously and proportionally adjusting flow |
| CN214464705U (en) * | 2021-04-01 | 2021-10-22 | 无锡市国成液压机械制造有限公司 | Variable plunger pump applied to closed hydraulic system |
-
2022
- 2022-02-28 CN CN202210211461.8A patent/CN114439718A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6412173A (en) * | 1987-07-03 | 1989-01-17 | Honda Motor Co Ltd | Variable capacity type swash plate type hydraulic device |
| DE102010036096A1 (en) * | 2010-09-01 | 2012-03-01 | Gottfried Wilhelm Leibniz Universität Hannover | Ball screw drive has manually adjustable setting device, by which prestressing force is adjustable, where electrical clamping force sensor is provided for detecting prestressing force |
| CN203656087U (en) * | 2014-01-02 | 2014-06-18 | 上海理工大学 | Double-nut ball screw pair capable of accurately adjusting pre-tightening force |
| CN104565252A (en) * | 2015-01-30 | 2015-04-29 | 山东大学 | Dual-nut ball screw assembly with controllable pre-tightening force |
| CN104565253A (en) * | 2015-01-30 | 2015-04-29 | 山东大学 | Automatic pre-tightening device for double-nut ball screw pair |
| CN107061655A (en) * | 2016-11-02 | 2017-08-18 | 广东理工学院 | Ball guide screw nat and pre-tension method |
| CN110685879A (en) * | 2019-10-09 | 2020-01-14 | 太原理工大学 | Variable mechanism of oblique axis type plunger pump for continuously and proportionally adjusting flow |
| CN214464705U (en) * | 2021-04-01 | 2021-10-22 | 无锡市国成液压机械制造有限公司 | Variable plunger pump applied to closed hydraulic system |
Non-Patent Citations (1)
| Title |
|---|
| 赵升吨等: ""电磁直驱式液压泵及其发展趋势"", 《液压与气动》, no. 2, pages 1 - 9 * |
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