CN113503235B - Variable adjusting mechanism for hydraulic pump - Google Patents
Variable adjusting mechanism for hydraulic pump Download PDFInfo
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- CN113503235B CN113503235B CN202110630891.9A CN202110630891A CN113503235B CN 113503235 B CN113503235 B CN 113503235B CN 202110630891 A CN202110630891 A CN 202110630891A CN 113503235 B CN113503235 B CN 113503235B
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- follow
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- sleeve
- piston sleeve
- shell
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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
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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
- F04B1/122—Details or component parts, e.g. valves, sealings or lubrication means
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Reciprocating Pumps (AREA)
Abstract
The invention discloses a variable adjusting mechanism for a hydraulic pump, which comprises a follow-up piston sleeve, wherein the follow-up piston sleeve is positioned in a shell, an oil distributing cover is arranged at the upper end of the follow-up piston sleeve, a follow-up piston is sleeved in the follow-up piston sleeve, and a follow-up cavity is arranged between the follow-up piston and an inner hole of the follow-up piston sleeve; the bottom end of the follow-up piston is matched with the sloping cam plate. According to the invention, the shell and the oil distributing cover are connected into a whole through the follow-up piston sleeve, and the follow-up cavity is formed between the follow-up piston and the inner hole of the follow-up piston sleeve, so that the condition that the inner hole of the shell is easy to deform when the follow-up piston and the inner hole wall of the shell relatively move in the prior art is changed, the stability of the movement of the follow-up piston is effectively improved, the reliability of flow and pressure regulation of the hydraulic plunger pump is improved, and the safety of the hydraulic pump and even a hydraulic system is improved. In conclusion, the invention has the characteristics of improving the motion stability of the follow-up piston and effectively reducing the oil leakage phenomenon.
Description
Technical Field
The present invention relates to a variable adjustment mechanism, and more particularly, to a variable adjustment mechanism for a hydraulic pump.
Background
The variable regulating mechanism determines the realization of the constant-pressure variable performance of the hydraulic pump, so that the motion stability and the response speed of the variable mechanism all indirectly control the flow and the pressure characteristics of the hydraulic pump. Therefore, the improvement of the reliability of the variable adjustment mechanism of the hydraulic plunger pump is particularly important.
Swash plate type axial piston pumps are generally divided into inner and outer support structures. The variable mechanism mainly comprises a return part and a follow-up part, wherein the return part is mainly divided into a single spring mechanism and a multi-spring mechanism, and the single spring return mechanism is mainly used for externally supporting the hydraulic pump; the multi-spring mechanism is mainly used for internally supporting the hydraulic pump. The follower portion corresponding to the multi-spring mechanism mainly comprises a follower cavity and a follower piston capable of axially moving in the follower cavity, and in most of the existing internal support structure hydraulic pumps, the follower cavity is formed by opening holes in a shell, and a cylindrical friction pair is formed between the follower piston and the follower cavity. Because the shell is usually made of aluminum alloy, the follow-up piston is made of structural steel, when the follow-up piston pushes the sloping cam plate or the return spring pushes the sloping cam plate to enable the follow-up piston to enter the follow-up cavity, the inner hole of the shell is extremely easy to deform, the friction pair is damaged, and the movement stability of the follow-up piston in the follow-up cavity is further affected. In the prior art, the follow-up cavity is communicated with the high-pressure oil passage on the oil distributing cover of the hydraulic pump at the joint surface of the shell through the adjusting oil passage, so that the end face seal is required to be added at the joint surface of the shell, and the problem is that the high-pressure oil from the high-pressure cavity easily flushes the annular groove of the end face seal, thereby causing deformation and oil leakage of the joint surface of the shell and the oil distributing cover. Therefore, the prior art has the problems that the motion stability of the follow-up piston is poor and the oil leakage phenomenon is easy to occur.
Disclosure of Invention
The purpose of the present invention is to provide a variable adjustment mechanism for a hydraulic pump. The invention has the characteristics of improving the motion stability of the follow-up piston and effectively reducing the occurrence of oil leakage.
The technical scheme of the invention is as follows: the variable regulating mechanism for the hydraulic pump comprises a follow-up piston sleeve, wherein the follow-up piston sleeve is positioned in a shell, an oil distributing cover is arranged at the upper end of the follow-up piston sleeve, a follow-up piston is sleeved in the follow-up piston sleeve, and a follow-up cavity is arranged between the follow-up piston and an inner hole of the follow-up piston sleeve; the bottom end of the follow-up piston is matched with the sloping cam plate.
In the variable adjusting mechanism for the hydraulic pump, a first sealing ring is arranged between the follow-up piston sleeve and the oil distributing cover, and check rings are arranged on the upper side and the lower side of the first sealing ring; and a second sealing ring is arranged between the follow-up piston sleeve and the shell.
In the variable adjusting mechanism for the hydraulic pump, the following piston sleeve comprises a sleeve body, wherein a positioning cylinder body is arranged at the upper end of the sleeve body, and the diameter of the positioning cylinder body is smaller than that of the sleeve body; a limiting supporting disc is also arranged between the sleeve body and the positioning cylinder body.
In the variable adjusting mechanism for the hydraulic pump, the oil distributing cover is provided with a positioning hole matched with the positioning cylinder, and the bottom of the positioning hole is provided with an inclined hole communicated with a control oil path of the high-pressure valve of the hydraulic pump.
In the variable adjusting mechanism for the hydraulic pump, the outer side wall of the sleeve body is also provided with a stepped cylindrical thin-wall structure matched with the inner wall of the shell.
In the variable adjusting mechanism for the hydraulic pump, the following piston sleeve and the following piston are made of structural steel materials.
Compared with the prior art, the invention connects the shell and the oil distributing cover into a whole through the follow-up piston sleeve, and a follow-up cavity is formed between the follow-up piston and the inner hole of the follow-up piston sleeve, so that the condition that the inner hole of the shell is easy to deform when the follow-up piston and the inner hole wall of the shell relatively move in the prior art is changed, the stability of the motion of the follow-up piston is effectively improved, the reliability of flow and pressure regulation of the hydraulic plunger pump is improved, and the safety of the hydraulic pump and even a hydraulic system is improved; according to the invention, the control oil from the high-pressure valve cavity and the low-pressure oil return of the pump cavity are respectively sealed by the two radial seals (the first seal ring and the second seal ring), so that the condition that the end face seal groove and the seal ring of the shell in the existing structure are easy to be scoured and deformed by high-pressure oil is effectively avoided, the sealing reliability of the hydraulic pump is improved, and the occurrence of the oil seepage phenomenon can be effectively reduced. In addition, one end of the follow-up piston sleeve is assembled in the inner hole of the oil distributing cover, so that manufacturability and vibration resistance of the whole pump are improved when the oil distributing cover is assembled on the shell. Meanwhile, the control precision and response speed of variable adjustment of the hydraulic pump can be improved through the mutual coordination of the structures, so that the reliability of the aviation hydraulic plunger pump in the aircraft flight is improved. In conclusion, the invention has the characteristics of improving the motion stability of the follow-up piston and effectively reducing the oil leakage phenomenon.
Drawings
FIG. 1 is a structural view of the present invention;
fig. 2 is a partial enlarged view of fig. 1.
The marks in the drawings are: the oil distributing device comprises a 1-oil distributing cover, a 2-retainer ring, a 3-first sealing ring, a 4-second sealing ring, a 5-follow-up piston sleeve, a 6-follow-up piston, a 7-shell, an 8-swash plate, 9-positioning holes, a 501-sleeve body, 502-positioning cylinders and 503-limiting support plates.
Detailed Description
The invention is further illustrated by the following figures and examples, which are not intended to be limiting.
Examples. The variable adjusting mechanism for the hydraulic pump is formed as shown in fig. 1-2 and comprises a follow-up piston sleeve 5 positioned in a shell 7, wherein an oil distributing cover 1 is arranged at the upper end of the follow-up piston sleeve 5, a follow-up piston 6 is sleeved in the follow-up piston sleeve 5, and a follow-up cavity is arranged between the follow-up piston 6 and an inner hole of the follow-up piston sleeve 5; the bottom end of the follower piston 6 is matched with a sloping cam plate 8.
A first sealing ring 3 is arranged between the follow-up piston sleeve 5 and the oil distributing cover 1, and check rings 2 are arranged on the upper side and the lower side of the first sealing ring 3; a second sealing ring 4 is arranged between the follow-up piston sleeve 5 and the shell 7.
The follower piston sleeve 5 comprises a sleeve body 501, a positioning cylinder 502 is arranged at the upper end of the sleeve body 501, and the diameter of the positioning cylinder 502 is smaller than that of the sleeve body 501; a limit supporting disc 503 is also arranged between the sleeve body 501 and the positioning cylinder 502.
The oil distributing cover 1 is provided with a positioning hole 9 matched with the positioning cylinder 502, and the bottom of the positioning hole 9 is provided with an inclined hole communicated with a control oil path of a high-pressure valve of the hydraulic pump.
The outer side wall of the sleeve body 501 is also provided with a stepped cylindrical thin-wall structure matched with the inner wall of the shell 7, so that the sleeve is convenient to install and detach.
The follower piston sleeve 5 and the follower piston 6 are made of structural steel materials.
In the present invention, as shown in fig. 1, the oil distribution cap 1 is assembled with the housing 7 by the positioning action of the slave piston sleeve 5. The upper end of the follow-up piston sleeve 5 is a positioning hole of an oil distributing cover, and a control oil way for communicating the high-pressure valve of the hydraulic pump through an inclined hole is designed at the bottom of the hole. The lower end of the follow-up piston sleeve is of a stepped cylindrical thin-wall structure and is matched with the inner hole of the shell. The servo piston sleeve is internally provided with a servo piston, and a cylindrical pair is formed between the servo piston sleeve and the servo piston. One end of the follow-up piston and an inner hole of the follow-up piston sleeve form a follow-up cavity, and the other end of the follow-up piston is contacted with the sloping cam plate, so that a follow-up part of the variable adjusting mechanism is formed. Because the follower piston sleeve and the follower piston are made of structural steel materials, when the follower piston reciprocates in the follower cavity, the follower piston almost has no deformation, and therefore, the deformation of the inner hole of the hydraulic pump shell is avoided.
The follow-up piston sleeve is provided with a first sealing ring and a second sealing ring which respectively form radial sealing with the inner hole of the shell and the positioning hole of the oil distributing cover. Because the first sealing ring is mainly used for sealing high-pressure oil of the oil distributing cover, two check rings are arranged at the sealing position for protection. The second sealing ring mainly seals the oil return of the pump cavity, and the oil return pressure is generally far lower than 3.5MPa, namely the pressure is not high, so that a check ring is not required to be arranged at the position for protection.
As shown in the figure, the positioning cylinder end of the follow-up piston sleeve is assembled in the positioning hole of the oil distributing cover, so that the oil distributing cover has a positioning function and is convenient to assemble and connect with the shell. In particular, by positioning the follower piston sleeve, the connection stiffness of the hydraulic pump housing packaging system can be improved, thereby improving the vibration resistance of the hydraulic pump.
Claims (1)
1. A variable adjustment mechanism for a hydraulic pump, characterized by: the oil distributing device comprises a follow-up piston sleeve (5) positioned in a shell (7), wherein an oil distributing cover (1) is arranged at the upper end of the follow-up piston sleeve (5), a follow-up piston (6) is sleeved in the follow-up piston sleeve (5), and a follow-up cavity is arranged between the follow-up piston (6) and an inner hole of the follow-up piston sleeve (5); the bottom end of the follow-up piston (6) is matched with the sloping cam plate (8);
a first sealing ring (3) is arranged between the follow-up piston sleeve (5) and the oil distributing cover (1), and check rings (2) are arranged on the upper side and the lower side of the first sealing ring (3); a second sealing ring (4) is arranged between the follow-up piston sleeve (5) and the shell (7);
the servo piston sleeve (5) comprises a sleeve body (501), a positioning cylinder body (502) is arranged at the upper end of the sleeve body (501), and the diameter of the positioning cylinder body (502) is smaller than that of the sleeve body (501); a limit supporting disc (503) is also arranged between the sleeve body (501) and the positioning cylinder body (502);
the oil distributing cover (1) is provided with a positioning hole (9) matched with the positioning cylinder body (502), and the bottom of the positioning hole (9) is provided with an inclined hole communicated with a control oil circuit of the high-pressure valve of the hydraulic pump;
the outer side wall of the sleeve body (501) is also provided with a stepped cylindrical thin-wall structure matched with the inner wall of the shell (7);
the following piston sleeve (5) and the following piston (6) are made of structural steel materials;
an axial hole is also arranged above the inner hole of the follow-up piston sleeve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110630891.9A CN113503235B (en) | 2021-06-07 | 2021-06-07 | Variable adjusting mechanism for hydraulic pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110630891.9A CN113503235B (en) | 2021-06-07 | 2021-06-07 | Variable adjusting mechanism for hydraulic pump |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113503235A CN113503235A (en) | 2021-10-15 |
| CN113503235B true CN113503235B (en) | 2023-07-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110630891.9A Active CN113503235B (en) | 2021-06-07 | 2021-06-07 | Variable adjusting mechanism for hydraulic pump |
Country Status (1)
| Country | Link |
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| CN (1) | CN113503235B (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1342905A (en) * | 1970-09-02 | 1974-01-10 | Nat Res Dev | Cam follower piston |
| JP2000154775A (en) * | 1998-11-19 | 2000-06-06 | Kayaba Ind Co Ltd | Piston pump |
| CN202326055U (en) * | 2011-11-22 | 2012-07-11 | 南京晨光集团有限责任公司 | Inclined-tray type dosing plunger pump |
| CN207377753U (en) * | 2017-10-16 | 2018-05-18 | 青岛大学 | A kind of DC Variable stator permanent-magnet integrated power device |
| CN109469594A (en) * | 2018-09-29 | 2019-03-15 | 北京航空航天大学 | Continuous voltage regulating electric-hydraulic proportion shaft orientation plunger variable pump for plane hydraulic system |
| CN210422902U (en) * | 2019-07-22 | 2020-04-28 | 新乡市华航航空液压设备有限公司 | Antipollution dual-redundancy variable plunger pump |
| CN112065681A (en) * | 2020-09-16 | 2020-12-11 | 中航力源液压股份有限公司 | Stepless adjusting mechanism and method for inclination angle of swash plate of hydraulic plunger pump |
| CN112412725A (en) * | 2020-10-27 | 2021-02-26 | 中国航空工业集团公司金城南京机电液压工程研究中心 | Hydraulic pump oil film research device of adjustable swash plate angle |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2037635A1 (en) * | 1970-07-29 | 1972-02-03 | Robert Bosch Gmbh, 7000 Stuttgart | Adjustable axial piston machine |
| DE3042949A1 (en) * | 1980-11-14 | 1982-07-01 | Fichtel & Sachs Ag, 8720 Schweinfurt | Radial piston pump with two-part housing - has outer part enclosed in steel bush pressed on with interference fit, with inner part containing pistons |
| US8647075B2 (en) * | 2009-03-18 | 2014-02-11 | Eaton Corporation | Control valve for a variable displacement pump |
| CN102235179A (en) * | 2010-04-22 | 2011-11-09 | 周觉明 | Jet thermal energy and nuclear energy conversion engine with rotary cylinder piston |
| CN108331727A (en) * | 2017-10-11 | 2018-07-27 | 中国航发西安动力控制科技有限公司 | A kind of regulating mechanism of plunger pump swash plate |
| CN209569129U (en) * | 2019-02-01 | 2019-11-01 | 中航力源液压股份有限公司 | A kind of hydraulic planger pump of two grades of power control devices |
| CN111608897A (en) * | 2020-05-28 | 2020-09-01 | 天津捷强动力装备股份有限公司 | Displacement adjusting method and structure of variable plunger motor |
-
2021
- 2021-06-07 CN CN202110630891.9A patent/CN113503235B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1342905A (en) * | 1970-09-02 | 1974-01-10 | Nat Res Dev | Cam follower piston |
| JP2000154775A (en) * | 1998-11-19 | 2000-06-06 | Kayaba Ind Co Ltd | Piston pump |
| CN202326055U (en) * | 2011-11-22 | 2012-07-11 | 南京晨光集团有限责任公司 | Inclined-tray type dosing plunger pump |
| CN207377753U (en) * | 2017-10-16 | 2018-05-18 | 青岛大学 | A kind of DC Variable stator permanent-magnet integrated power device |
| CN109469594A (en) * | 2018-09-29 | 2019-03-15 | 北京航空航天大学 | Continuous voltage regulating electric-hydraulic proportion shaft orientation plunger variable pump for plane hydraulic system |
| CN210422902U (en) * | 2019-07-22 | 2020-04-28 | 新乡市华航航空液压设备有限公司 | Antipollution dual-redundancy variable plunger pump |
| CN112065681A (en) * | 2020-09-16 | 2020-12-11 | 中航力源液压股份有限公司 | Stepless adjusting mechanism and method for inclination angle of swash plate of hydraulic plunger pump |
| CN112412725A (en) * | 2020-10-27 | 2021-02-26 | 中国航空工业集团公司金城南京机电液压工程研究中心 | Hydraulic pump oil film research device of adjustable swash plate angle |
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| CN113503235A (en) | 2021-10-15 |
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