CN109185123B - External gear pump capable of synchronizing variable torque - Google Patents
External gear pump capable of synchronizing variable torque Download PDFInfo
- Publication number
- CN109185123B CN109185123B CN201811172950.7A CN201811172950A CN109185123B CN 109185123 B CN109185123 B CN 109185123B CN 201811172950 A CN201811172950 A CN 201811172950A CN 109185123 B CN109185123 B CN 109185123B
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- Prior art keywords
- gear
- variable
- pump
- disc
- driving gear
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2/00—Rotary-piston machines or pumps
- F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C2/12—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
- F04C2/14—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
- F04C2/18—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with similar tooth forms
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C14/00—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
- F04C15/0042—Systems for the equilibration of forces acting on the machines or pump
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
- F04C15/0042—Systems for the equilibration of forces acting on the machines or pump
- F04C15/0046—Internal leakage control
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Rotary Pumps (AREA)
- Details And Applications Of Rotary Liquid Pumps (AREA)
Abstract
The invention discloses an external gear pump capable of synchronously changing variable torque, which comprises a pump shell, a front end cover, a rear end cover, a gear set formed by two gears which are positioned in the pump shell and meshed with each other, a front combination body and a rear combination body which are respectively positioned at the front side and the rear side of the gear set, wherein the front combination body and the rear combination body have the same structure and are composed of a pressing plate, a side plate, a variable disc and a variable spring, the side plate is provided with a circular arc notch, the variable disc and the circular arc notch surface of the side plate form a pair of sliding pairs along the axial direction, and the outer end surface of the variable disc is pressed by the pressing plate. The invention can realize synchronous change of pump power and displacement along with the effective meshing width of the gears, and simultaneously can avoid excessive axial leakage and improve the volume rate of the pump.
Description
Technical Field
The invention belongs to the technical field of gear pumps, and particularly relates to an external gear pump capable of synchronizing variable torque conversion.
Background
The external gear pump (gear pump for short) is a quantitative power pump for pumping working oil, has extremely wide application in the fields of mining machinery and the like, and has great change of working conditions in different application environments or the same application environment, and the changed working conditions naturally require variable flow to be matched with the variable flow. The current common method adopts the functional combination of quantitative oil supply of a pump and steady flow of an overflow throttle valve to reflux redundant high-pressure flow to a low-pressure oil suction end, and has the biggest defects that the power (torque) of a quantitative pump is not changed along with the change of displacement, so that the waste is larger. For many years, the development of a novel gear pump capable of controlling the displacement of the pump without changing the rotation speed of the pump is a main aim of research. In general, the variable manner of variable engagement width is still the main stream of research and innovation, but the related research and effort does not relate to the problem of variation of power (torque) synchronization. In view of this, a new variable displacement pump mechanism is proposed based on a power (torque) synchronous variable angle.
Disclosure of Invention
The invention provides an external gear pump capable of synchronously changing variable torque according to the defects in the background art, and can realize synchronous change of pump power and displacement along with the effective meshing width of the gear, and simultaneously avoid excessive axial leakage and improve the volume rate of the pump.
In order to achieve the above purpose, the technical solution of the present invention is as follows:
the utility model provides a but external gear pump of synchronous variable torque, includes pump case, front end housing, rear end housing and comprises two gear train that are located inside the pump case and intermeshing's the gear, is equipped with oil inlet and oil-out on the pump case, its characterized in that: the external gear pump also comprises a front assembly and a rear assembly which are respectively positioned at the front side and the rear side of the gear set, the front assembly and the rear assembly have the same structure and are composed of a pressing plate, a side plate, a variable disc and a variable spring, the side plate is provided with a circular arc notch, the variable disc and the circular arc notch surface of the side plate form a pair of sliding pairs along the axial direction, and the outer end surface of the variable disc is pressed by the pressing plate;
the gear set consists of a driving gear and a driven gear, a pressing plate and a side plate of each combination are simultaneously assembled on gear supporting shafts of the driving gear and the driven gear, a variable disc of a front combination is installed on the gear supporting shaft of the driven gear, a variable disc of a rear combination is installed on the gear supporting shaft of the driving gear, variable springs of two combinations are respectively installed between the inner end surfaces of the corresponding variable discs and the corresponding gear end surfaces, and the gear supporting shaft of the driving gear is rotationally connected with a front end cover;
the high-pressure balance cavity for guiding in oil discharge is formed among the outer end face of the pressing plate of the rear combination body, the inner surface of the pump shell and the inner face of the rear end cover, the rear combination body can axially move in the high-pressure balance cavity along the gear supporting shaft of the driving gear, the high-pressure balance cavity is communicated with the oil outlet through the oil outlet guiding groove formed in the inner wall of the pump shell, the front combination body is fixedly arranged between the driving gear and the front end cover, and the supporting shaft of the driven gear can axially move in the front combination body.
Preferably, the variable disc consists of a base and a plurality of claw clamps, the claw clamps are uniformly distributed on the inner end surface of the base, the size and shape of the claw clamps are matched with those of tooth grooves of the driving gear and the driven gear, and the variable spring is arranged in the middle of the claw clamps.
Preferably, the base of the variable disc is provided with a plurality of tooth holes, and the number, shape and position of the tooth holes are consistent with those of the gear teeth.
Preferably, the two ends of the gear supporting shafts of the driving gear and the driven gear are respectively provided with a clamp spring.
Preferably, cover shell oil seal gaskets are arranged among the front end cover, the rear end cover and the pump shell.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, the dynamic balance between the oil pressure acting on the outer side of the rear assembly and the spring force on the inner side of the rear assembly in the high-pressure balance cavity is adopted, so that the automatic change of the effective meshing width of the driving gear is realized, and the synchronous change of the pump displacement and the power is realized; the variable disc is arranged on the oil pressure on the end face of the variable claw in the tooth slot, the high-pressure oil on the rear end face of the variable disc is balanced, and the high-pressure oil directly acts on the end faces of the driving gear and the driven gear through the tooth holes, so that the gears are pressed on the respective side plates, the automatic compensation of the axial clearance is realized, excessive axial leakage is avoided, and the volume rate of the pump is improved.
Drawings
Other features, objects and advantages of the present invention will become more apparent upon reading of the detailed description of non-limiting embodiments, made with reference to the following drawings.
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a schematic diagram of an exploded construction of the present invention;
FIG. 3 is a schematic view of the internal structure of the pump housing of the present invention with the minimum effective engagement width of the driving gear and the driven gear;
FIG. 4 is a schematic view of the internal structure of the pump housing of the present invention with the maximum effective engagement width of the driving gear and the driven gear;
FIG. 5 is a schematic view of the structure of an oil outlet guide groove for guiding oil from an oil outlet to a high-pressure balance cavity;
FIG. 6 is a schematic diagram of the force applied to the gear end face of the present invention under the action of high pressure oil;
in the figure: 1. pump case, 101, oil inlet, 102, oil outlet, 103, oil outlet leading-in groove, 2, front end cover, 3, rear end cover, 4, front combination, 5, rear combination, 6, pressing plate, 7, side plate, 701, arc notch, 8, variable disc, 801, base, 802, claw clip, 9, variable spring, 10, jump ring, 11, cover shell oil seal pad, 12, driving gear, 13, driven gear, 14, high-pressure balance cavity, 15, gear support shaft of driving gear, 16, gear support shaft of driven gear, 17 and tooth hole.
Detailed Description
The invention is further described in connection with the following detailed description, in order to make the technical means, the creation characteristics, the achievement of the purpose and the effect of the invention easy to understand.
As shown in fig. 1, 2 and 5, the external gear pump capable of synchronous variable torque conversion comprises a pump shell 1, a front end cover 2, a rear end cover 3 and a gear set formed by two gears which are positioned in the pump shell and meshed with each other, wherein a cover shell oil seal gasket 11 is arranged between the front end cover and the rear end cover, an oil inlet 101 and an oil outlet 102 are arranged on the pump shell, the external gear pump further comprises a front assembly 4 and a rear assembly 5 which are respectively positioned at the front side and the rear side of the gear set, the front assembly and the rear assembly have the same structure and are respectively composed of a pressing plate 6, a side plate 7, a variable disc 8 and a variable spring 9, the side plate 7 is provided with a circular arc notch 701, the variable disc 8 and the circular arc notch surface 701 of the side plate form a pair of sliding pairs along the axial direction, the outer end surface of the variable disc 8 is pressed by the pressing plate 6, the gear set is composed of a driving gear 12 and a driven gear 13, the pressing plate and the side plate of each combination are simultaneously assembled on the gear supporting shafts of the driving gear and the driven gear, the variable disc of the front combination is installed on the gear supporting shaft 16 of the driven gear, the variable disc of the rear combination is installed on the gear supporting shaft 15 of the driving gear, the variable springs 9 of the two combinations are respectively installed between the inner end surfaces of the corresponding variable discs and the corresponding gear end surfaces, the variable disc 8 consists of a base 801 and a plurality of claw cards 802, the plurality of claw cards 802 are uniformly distributed on the inner end surfaces of the base 801, the sizes of the claw cards are matched with the sizes of tooth grooves of the driving gear 12 and the driven gear 13, the variable springs 9 are installed in the middle of the plurality of claw cards, the base 801 of the variable disc 8 is provided with a plurality of tooth holes 17, the number, the shape and the position of the tooth holes 17 are consistent with the number, the shape and the position of the tooth teeth of the gear, the setting of the tooth holes 17, the processing of claw card 802 is favorable to, the gear support shaft 15 of driving gear rotates and installs on front end housing 2 and rear end housing 3, form a high-pressure balance chamber 14 of leading-in oil extraction between the clamp plate outer end face of back assembly, pump case internal surface and the rear end housing inner face, the back assembly can carry out axial displacement along the gear support shaft 15 of driving gear in high-pressure balance chamber, high-pressure balance chamber 14 communicates with oil-out 102 through the play oil lead-in groove 103 that establishes on the pump case inner wall, preceding assembly fixed mounting is between driving gear 12 and front end housing 2, and driven gear's back shaft 16 can carry out axial displacement in the front assembly.
The two ends of the gear supporting shafts of the driving gear and the driven gear are respectively provided with a clamping spring 10, and the clamping springs 10 can limit all other parts except the rear combination on the gear supporting shaft 15 of the driving gear to be an axially fastened whole, and limit all other parts except the front combination on the gear supporting shaft 16 of the driven gear to be an axially fastened whole.
In fig. 3 and 4, the positions "D" and "E" are the extreme positions of the rear assembly and the axial movement of the gear shaft and the driven gear driven by the rear assembly, the position "D" determines the minimum effective engagement width a, the position "E" determines the maximum effective engagement width b, a high-pressure balance chamber for guiding oil drainage is formed between the outer end face of the pressing plate in the rear assembly, the inner surface of the pump shell and the inner face of the rear end cover, and the dynamic balance between the oil pressure acting on the outer side of the rear assembly and the spring force on the inner side of the high-pressure balance chamber and jointly determine the specific positions of the axial movement of the rear assembly and the gear shaft and the driven gear driven by the rear assembly.
The gear pump comprises the following specific working processes: working oil is sucked from the oil inlet 101 by the high-speed meshing rotation of the driving gear 12 and the driven gear 13, and is brought into the oil outlet 102 by the rotation of the driving gear 12 and the driven gear 13 in the tooth space of the driving gear 12 and the driven gear 13, and a part of the oil is supplied to the outside and the other part is led into the high-pressure balance chamber 14 by the oil outlet leading-in groove 103 on the pump housing 1 (as shown in fig. 5).
As shown in fig. 3, when the flow rate required by the environment increases, the oil pressure in the high-pressure balance chamber decreases, and the variable disc, the side plate, the pressure plate, and the gear support shaft and the driven gear of the rear assembly located at the rear end of the driving gear support shaft are driven to move toward the rear end of the pump until the "E" position of the maximum effective engagement width is reached under the elastic force of the two compressed variable springs (i.e., the variable spring on the driving gear and the variable spring on the driven gear). At this time, the supply flow rate and the oil pressure are gradually increased, the elastic force of the variable spring is gradually decreased by the restoration of the variable spring, and the elastic force and the oil pressure are balanced at the position of the new effective engagement width.
As shown in fig. 4, when the flow rate required by the environment decreases, the oil pressure of the high-pressure oil on the outer side surface of the rear combination body increases, driving the variable disc, the side plate, the pressing plate of the rear combination body positioned at the rear end of the driving gear support shaft, and the gear support shaft and the driven gear of the driven gear to move toward the front end of the pump until reaching the "D" position of the minimum effective engagement width. At this time, the supply flow rate is gradually decreased, the high-pressure oil pressure is gradually decreased, the elastic force of the variable spring is gradually increased due to compression, and the elastic force and the high-pressure oil pressure are balanced at a new effective engagement width position.
In summary, the invention realizes synchronous variation of pump displacement and power by dynamic balance between the oil pressure acting on the outer side of the rear assembly and the spring force on the inner side of the rear assembly in the high-pressure balance cavity and automatic change of the effective meshing width of the driving gear.
As shown in fig. 6, the oil pressure on the end surfaces of the variable pawls in the tooth grooves is balanced by the high-pressure oil on the rear end surfaces of the variable pawls, and the high-pressure oil directly acts on the end surfaces of the driving gear and the driven gear through the tooth holes 17, so that the gears are pressed on the respective side plates, automatic compensation of axial gaps is realized, excessive axial leakage is avoided, and the volume ratio of the pump is improved.
While the fundamental and principal features of the invention and advantages of the invention have been shown and described, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing exemplary embodiments, but may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (4)
1. The utility model provides a but external gear pump of synchronous variable torque, includes pump case, front end housing, rear end housing and comprises two gear train that are located inside the pump case and intermeshing's the gear, is equipped with oil inlet and oil-out on the pump case, its characterized in that:
the external gear pump also comprises a front assembly and a rear assembly which are respectively positioned at the front side and the rear side of the gear set, the front assembly and the rear assembly have the same structure and are composed of a pressing plate, a side plate, a variable disc and a variable spring, the side plate is provided with a circular arc notch, the variable disc and the circular arc notch surface of the side plate form a pair of sliding pairs along the axial direction, and the outer end surface of the variable disc is pressed by the pressing plate;
the gear set consists of a driving gear and a driven gear, a pressing plate and a side plate of each combination are simultaneously assembled on gear supporting shafts of the driving gear and the driven gear, a variable disc of a front combination is installed on the gear supporting shaft of the driven gear, a variable disc of a rear combination is installed on the gear supporting shaft of the driving gear, variable springs of two combinations are respectively installed between the inner end surfaces of the corresponding variable discs and the corresponding gear end surfaces, and the gear supporting shaft of the driving gear is rotationally connected with a front end cover;
the rear assembly can axially move in the high-pressure balance cavity along a gear support shaft of the driving gear, the high-pressure balance cavity is communicated with the oil outlet through an oil outlet guide groove arranged on the inner wall of the pump shell, the front assembly is fixedly arranged between the driving gear and the front end cover, and the gear support shaft of the driven gear can axially move in the front assembly;
the variable disc consists of a base and a plurality of claw clamps, the claw clamps are uniformly distributed on the inner end face of the base, the size and shape of the claw clamps are matched with those of tooth grooves of the driving gear and the driven gear, and the variable spring is arranged in the middle of the claw clamps.
2. The synchroable variable torque external gear pump as set forth in claim 1, wherein: the base of the variable disc is provided with a plurality of tooth holes, and the number, shape and position of the tooth holes are consistent with those of the gear teeth.
3. The synchroable variable torque external gear pump as set forth in claim 1, wherein: and clamping springs are arranged at two ends of the gear supporting shafts of the driving gear and the driven gear.
4. The synchroable variable torque external gear pump as set forth in claim 1, wherein: cover shell oil seal gaskets are arranged among the front end cover, the rear end cover and the pump shell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811172950.7A CN109185123B (en) | 2018-10-09 | 2018-10-09 | External gear pump capable of synchronizing variable torque |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811172950.7A CN109185123B (en) | 2018-10-09 | 2018-10-09 | External gear pump capable of synchronizing variable torque |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109185123A CN109185123A (en) | 2019-01-11 |
| CN109185123B true CN109185123B (en) | 2023-09-01 |
Family
ID=64947445
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811172950.7A Active CN109185123B (en) | 2018-10-09 | 2018-10-09 | External gear pump capable of synchronizing variable torque |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109185123B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102927002A (en) * | 2012-12-04 | 2013-02-13 | 泸州众大科技液压件有限公司 | High-pressure gear pump |
| CN105041639A (en) * | 2015-08-27 | 2015-11-11 | 刘凡 | External gearing variable gear pump |
| CN209164071U (en) * | 2018-10-09 | 2019-07-26 | 宿迁学院 | It is a kind of can cogradient variable bending moment external gear rotary pump |
-
2018
- 2018-10-09 CN CN201811172950.7A patent/CN109185123B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102927002A (en) * | 2012-12-04 | 2013-02-13 | 泸州众大科技液压件有限公司 | High-pressure gear pump |
| CN105041639A (en) * | 2015-08-27 | 2015-11-11 | 刘凡 | External gearing variable gear pump |
| CN209164071U (en) * | 2018-10-09 | 2019-07-26 | 宿迁学院 | It is a kind of can cogradient variable bending moment external gear rotary pump |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109185123A (en) | 2019-01-11 |
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Effective date of registration: 20230719 Address after: 223800 South Huanghe Road, Suqian City, Jiangsu Province, 399 Applicant after: SUQIAN College Applicant after: STATE GRID JIANGSU ELECTRIC POWER Co.,Ltd. SUQIAN POWER SUPPLY BRANCH Address before: 223800 South Huanghe Road, Suqian City, Jiangsu Province, 399 Applicant before: SUQIAN College |
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