CN110848132A - Hand-operated hydraulic refueling device for aircraft - Google Patents
Hand-operated hydraulic refueling device for aircraft Download PDFInfo
- Publication number
- CN110848132A CN110848132A CN201911229231.9A CN201911229231A CN110848132A CN 110848132 A CN110848132 A CN 110848132A CN 201911229231 A CN201911229231 A CN 201911229231A CN 110848132 A CN110848132 A CN 110848132A
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- Prior art keywords
- oil
- gear
- pump
- cavity
- pump body
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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
- 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
- F04C11/00—Combinations of two or more machines or pumps, each being of rotary-piston or oscillating-piston type; Pumping installations
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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
- F04C13/00—Adaptations of machines or pumps for special use, e.g. for extremely high pressures
- F04C13/005—Removing contaminants, deposits or scale from the pump; Cleaning
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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
- F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
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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
- F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
- F04C15/06—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet
Abstract
The invention belongs to the field of aircraft hydraulic systems, and provides a hand-operated hydraulic refueling device for an aircraft, which is provided with an integrated sealed hydraulic oil tank and an oil filter device, so that the whole system is more compact in structure, smaller in size and lighter in structure, and is convenient to mount and maintain on the aircraft. In addition, the device selects an external gear pump, a group of gear amplification mechanisms are arranged inside the external gear pump to improve the rotating speed of the external gear, the operation mode of circular motion and the requirements of low pressure, large flow and light weight can be met, and the purpose of axially sucking oil by the driving gear and axially supplying oil by the driven gear can be realized through the guide of the backflow plate.
Description
Technical Field
The invention belongs to the field of aircraft hydraulic systems, and particularly relates to a hand-operated hydraulic refueling device for an aircraft
Background
In order to improve the reliability of the aircraft hydraulic system, the aircraft hydraulic system is often provided with two sets of mutually independent hydraulic systems, and when one set of hydraulic system fails, the other set of hydraulic system can enable the aircraft to work normally. The problem of consumption of hydraulic oil is certainly accompanied in daily maintenance and the use, in order to carry out real-time hydraulic oil supplement to two sets of hydraulic systems according to actual conditions, the hand-operated hydraulic pump can be matched with the reversing valve to realize hydraulic oil supplement to two different sets of hydraulic subsystems, but the hand-operated hydraulic pump can lead to a heavier body mechanism and a larger volume, and is not convenient to install on an aircraft. In addition, a general hydraulic pump often has an internal portion formed by a pair of external gears, and often cannot meet the requirements of low pressure and large flow.
Disclosure of Invention
The purpose of the invention is as follows: the hand-operated hydraulic refueling device for the aircraft is provided with the integrated sealed hydraulic oil tank and the oil filter device, so that the whole system is more compact in structure, smaller in size and lighter in structure, and the aircraft is convenient to install and maintain. In addition, the device selects an external gear pump, a group of gear amplification mechanisms are arranged inside the external gear pump to improve the rotating speed of the external gear, the operation mode of circular motion and the requirements of low pressure, large flow and light weight can be met, and the purpose of axially sucking oil by the driving gear and axially supplying oil by the driven gear can be realized through the guide of the backflow plate.
The technical scheme of the invention is as follows: provides a hand-operated hydraulic oiling device for an aircraft, which comprises a pump seat 1, a pump body 4, a crank 5, a pump body sealing nut 8, a handle gear 9, a pinion 11, a driving gear 12, a driven gear 3, a guide plate 14 and an oil filter 2,
an inner oil suction port and an outer oil suction port are formed in one end of the pump base 1; the other end of the pump seat 1 is provided with an oil outlet;
the pump body 4 is a shell with a cavity, and the pump body 4 and the pump base 1 are matched to form a closed cavity; the pump seat 1 is used for fixedly connecting a pump body 4;
the pump body 4 comprises a first cavity and a second cavity, and the pump body sealing nut 8 is arranged at the port of the first cavity and used for sealing the first cavity; the handle gear 9 is positioned in the first cavity, a gear shaft of the handle gear 9 penetrates through the pump body sealing nut 8, and a gear shaft of the handle gear 9 is connected with one end of the crank 5; the handle gear 9 is meshed with the pinion 11 in a first cavity; the pinion 11 penetrates through the first cavity and the second cavity, and the part of the pinion 11, which is positioned in the second cavity, penetrates through the driving gear 12 and is fixedly connected with the driving gear 12; the driving gear 12 is meshed with the driven gear 3; the driving gear 12 and the driven gear 3 are positioned in a second cavity;
a guide plate 14 is arranged at the end parts of the driving gear 12 and the driven gear 3, and the guide plate 14 is positioned between the driving gear 12 and the driven gear 3 and the pump base 1; the guide plate 14 is provided with an oil inlet hole and an oil outlet hole, a first guide groove is arranged on the periphery of the oil inlet hole, and a second guide groove is arranged on the periphery of the oil outlet hole;
oil enters the pump seat 1 through an inner oil suction port or an outer oil suction port, flows into an oil inlet hole of the guide plate 14, and is guided into one side of the meshing part of the driving gear 12 and the driven gear 3 through a first guide groove of the guide plate 14, wherein the first guide groove is used for changing the flow direction of the oil; through the rotation of the driving gear 12 and the driven gear 3, oil is transmitted to the other side opposite to the meshing part of the driving gear 12 and the driven gear 3, and then flows to the oil outlet of the guide plate 14 through the second guide groove; the second diversion trench is used for changing the flow direction of the oil liquid;
an oil filter 2 is arranged between the oil outlet of the guide plate 14 and the oil outlet of the pump seat 1, the oil filter is arranged in the pump seat 1, and the oil filter 2 is used for filtering oil.
Further, the pump base 1 is communicated with the oil tank 16 through an inner oil suction port; the oil tank 16 is fixedly connected with the pump base 1 through bolts.
Further, the gear ratio of the handle gear 9 to the pinion gear 11 is not less than 2.
Further, the gear shaft of the pinion 11 is internally hollow.
Further, the side of the deflector 14 is in sealing contact with the pump base 1; and a sealing ring 13 is arranged at the contact part of the guide plate 14 and the pump seat 1.
Further, a pump body sealing nut sealing ring 7 is arranged at the contact position of the pump body sealing nut 8 and the first cavity of the pump body 4 and used for sealing.
Further, a handle gear sealing ring 10 is arranged at the connecting part of the gear shaft of the handle gear 9 and the pump body sealing nut 8.
Further, hand formula hydraulic pressure filling device still includes handle 6, handle 6 and crank 5 fixed connection.
The invention has the beneficial effects that: the hand-operated hydraulic refueling device for the aircraft integrates the sealed hydraulic oil tank and the oil filtering device, so that the whole system is more compact in structure, smaller in size and lighter in structure, and is convenient to mount and maintain on the aircraft. In addition, the device adopts an external gear pump, and a group of gear amplification mechanisms are arranged in the device to improve the rotating speed of the external gear, so that the operating mode of circular motion and the requirements of low pressure, high flow and light weight can be met.
Drawings
Fig. 1 is a schematic view of the meshing of the driving and driven gears of the hand-operated hydraulic fuelling device for an aircraft according to the present invention;
fig. 2 is a cross-sectional view of the hand-operated hydraulic refueling unit for aircraft according to the invention;
fig. 3 is a general schematic view of a hand-operated hydraulic refueling unit for aircraft according to the invention;
fig. 4 a schematic view of a deflector plate of a hand-operated hydraulic fuelling device for an aircraft according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a schematic view of the meshing of a driving gear 12 and a driven gear 3 of a hand-operated hydraulic fuelling device for an aircraft according to the present invention; fig. 2 is a cross-sectional view of the hand-operated hydraulic refueling device for an aircraft according to the present invention, and fig. 3 is an overall schematic view of the hand-operated hydraulic refueling device for an aircraft according to the present invention; as shown in fig. 1, 2 and 3, the present embodiment: provides a hand-operated hydraulic oiling device for an aircraft, which comprises a pump seat 1, a pump body 4, a crank 5, a pump body sealing nut 8, a handle gear 9, a pinion 11, a driving gear 12, a driven gear 3, a guide plate 14 and an oil filter 2,
an inner oil suction port and an outer oil suction port are formed in one end of the pump base 1; the other end of the pump seat 1 is provided with an oil outlet;
the pump body 4 is a shell with a cavity, and the pump body 4 and the pump base 1 are matched to form a closed cavity; the pump seat 1 is used for fixedly connecting a pump body 4;
the pump body 4 comprises a first cavity and a second cavity, and the pump body sealing nut 8 is arranged at the port of the first cavity and used for sealing the first cavity; the handle gear 9 is positioned in the first cavity, a gear shaft of the handle gear 9 penetrates through the pump body sealing nut 8, and a gear shaft of the handle gear 9 is connected with one end of the crank 5; the handle gear 9 is meshed with the pinion 11 in a first cavity; the pinion 11 penetrates through the first cavity and the second cavity, and the part of the pinion 11, which is positioned in the second cavity, penetrates through the driving gear 12 and is fixedly connected with the driving gear 12; the driving gear 12 is meshed with the driven gear 3; the driving gear 12 and the driven gear 3 are positioned in a second cavity;
fig. 4 is a schematic view of a deflector of the hand-operated hydraulic refueling device for aircraft according to the present invention, as shown in fig. 4, the ends of the driving gear 12 and the driven gear 3 are provided with a deflector 14, and the deflector 14 is located between the driving gear 12 and the driven gear 3 and the pump base 1; the guide plate 14 is provided with an oil inlet hole and an oil outlet hole, a first guide groove is arranged on the periphery of the oil inlet hole, and a second guide groove is arranged on the periphery of the oil outlet hole;
oil enters the pump seat 1 through an inner oil suction port or an outer oil suction port, flows into an oil inlet hole of the guide plate 14, and is guided into one side of the meshing part of the driving gear 12 and the driven gear 3 through a first guide groove of the guide plate 14, wherein the first guide groove is used for changing the flow direction of the oil; through the rotation of the driving gear 12 and the driven gear 3, oil is transmitted to the other side opposite to the meshing part of the driving gear 12 and the driven gear 3, and then flows to the oil outlet of the guide plate 14 through the second guide groove; the second diversion trench is used for changing the flow direction of the oil liquid;
an oil filter 2 is arranged between the oil outlet of the guide plate 14 and the oil outlet of the pump seat 1, the oil filter is arranged in the pump seat 1, and the oil filter 2 is used for filtering oil.
Further, the pump base 1 is communicated with the oil tank 16 through an inner oil suction port; the oil tank 16 is fixedly connected with the pump base 1 through bolts. The hand-operated hydraulic refueling device for the aircraft is provided with the integrated sealed hydraulic oil tank and the oil filter device, so that the whole system is more compact in structure, smaller in size and lighter in structure, and the installation and maintenance of the aircraft are facilitated. Further, the gear ratio of the handle gear 9 to the pinion gear 11 is not less than 2. Further, the gear shaft of the pinion 11 is internally hollow. The device selects an external gear pump, and a group of gear amplification mechanisms are arranged inside the external gear pump to improve the rotating speed of the external gear pump, so that the operating mode of circular motion and the requirements of low pressure, high flow and light weight can be met.
Further, the side of the deflector 14 is in sealing contact with the pump base 1; and a sealing ring 13 is arranged at the contact part of the guide plate 14 and the pump seat 1. And a pump body sealing nut sealing ring 7 is arranged at the contact part of the pump body sealing nut 8 and the first cavity of the pump body 4 and used for sealing. And a handle gear sealing ring 10 is arranged at the connecting part of the gear shaft of the handle gear 9 and the pump body sealing nut 8.
Further, hand formula hydraulic pressure filling device still includes handle 6, handle 6 and crank 5 fixed connection.
The working principle of the invention is as follows:
the pump does circular motion through a rotating handle 6, drives a manual gear 9 and a pinion 11, enables a gear pump driving gear 12 and a driven gear 3 to obtain high-speed motion, and achieves the purposes of sucking oil from the axial direction of the driving gear and supplying oil from the axial direction of the driven gear through the guide of a guide plate 14. The oil inlet and outlet structure can better meet the requirements of an integrated oil tank and an oil filter layout, and has the advantages of compact structure, large oil supply amount, small occupied space, light weight, convenience in installation and maintenance, small operation space and the like. In addition, the hydraulic oil tank 16 and the oil filter 2 integrated with the pump save an oil filling tank and an oil filter device in the system, and are simple to disassemble and assemble and convenient to maintain and replace.
The oil absorption process is as follows: as shown in fig. 2, two closed working chambers are formed on both sides of the meshing point of the driving gear 12 and the driven gear 3. When the handle 6 is rotated clockwise, the engaged gear teeth are gradually disengaged at the lower side of the engagement point, so that the sealed working cavity is continuously changed from small to large to form partial vacuum, and oil is sucked from the oil tank 16 through the oil port to fill the gaps between the teeth.
The oil pressing process comprises the following steps: along with the rotation of the driving gear 12 and the driven gear 3, oil is brought to the upper side of the meshing point, and as the gear teeth gradually enter into meshing, the sealed working cavity is continuously changed from big to small, and the oil is extruded out through the oil outlet. The gear rotates for a circle to finish the oil absorption and oil discharge process.
Due to the action of the deflector 14, the oil suction port and the oil discharge port on two sides of the original gear meshing point are respectively guided to the axial direction of the driving gear 12 and the driven gear 3 by the deflector 14. Wherein, the axial oil suction hole of the driving gear 12 is respectively connected with the integrated oil tank 16 and the external oil inlet through the oil path on the pump seat 1; and the axial oil outlet of the driven gear 3 is filtered to the oil outlet through the oil way on the pump seat 1 and the oil filter 2, so that the oil filter precision of the oil supply system reaches the specified value.
The foregoing is merely a detailed description of the embodiments of the present invention, and some of the conventional techniques are not detailed. The scope of the present invention is not limited thereto, and any changes or substitutions that can be easily made by those skilled in the art within the technical scope of the present invention will be covered by the scope of the present invention. The protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. A hand-operated hydraulic refueling device for an aircraft is characterized by comprising a pump base (1), a pump body (4), a crank (5), a pump body sealing nut (8), a handle gear (9), a pinion (11), a driving gear (12), a driven gear (3), a guide plate (14) and an oil filter (2),
an inner oil suction port and an outer oil suction port are arranged at one end of the pump seat (1); the other end of the pump seat (1) is provided with an oil outlet;
the pump body (4) is a shell with a cavity; the pump seat (1) is fixedly connected with the pump body (4), and the pump body (4) is matched with the pump seat (1) to form a closed cavity;
the pump body (4) comprises a first cavity and a second cavity, and the pump body sealing nut (8) is arranged at the port of the first cavity and used for sealing the first cavity; the handle gear (9) is positioned in the first cavity, a gear shaft of the handle gear (9) penetrates through the pump body sealing nut (8), and a gear shaft of the handle gear (9) is connected with one end of the crank (5); the handle gear (9) is meshed with the pinion (11) in the first cavity; the pinion (11) penetrates through the first cavity and the second cavity, and the part of the pinion (11) located in the second cavity penetrates through the driving gear (12) and is fixedly connected with the driving gear (12); the driving gear (12) is meshed with the driven gear (3); the driving gear (12) and the driven gear (3) are positioned in the second cavity;
guide plates (14) are arranged at the end parts of the driving gear (12) and the driven gear (3), and the guide plates (14) are positioned between the driving gear (12) and the driven gear (3) and the pump base (1); the guide plate (14) is provided with an oil inlet hole and an oil outlet hole, a first guide groove is arranged on the periphery of the oil inlet hole, and a second guide groove is arranged on the periphery of the oil outlet hole;
oil enters the pump seat (1) through an inner oil suction port or an outer oil suction port, flows into an oil inlet hole of the guide plate (14), and is guided into one side of the meshing part of the driving gear (12) and the driven gear (3) through a first guide groove of the guide plate (14), wherein the first guide groove is used for changing the flow direction of the oil; through the rotation of the driving gear (12) and the driven gear (3), oil is transmitted to the other side, opposite to the meshing part of the driving gear (12) and the driven gear (3), and then flows to the oil outlet of the guide plate (14) through the second diversion trench; the second diversion trench is used for changing the flow direction of the oil liquid;
an oil filter (2) is arranged between an oil outlet of the guide plate (14) and an oil outlet of the pump seat (1), the oil filter is arranged in the pump seat (1), and the oil filter (2) is used for filtering oil.
2. The hand-operated hydraulic refueling device according to claim 1, wherein the pump base (1) is communicated with the oil tank (16) through an inner oil suction port; the oil tank (16) is fixedly connected with the pump base (1) through bolts.
3. The hand-operated hydraulic refueling unit as claimed in claim 1, wherein the transmission ratio of the handle gear (9) to the pinion (11) is not less than 2.
4. The hand-operated hydraulic refueling device as recited in claim 1, wherein the pinion shaft of the pinion (11) is internally hollow.
5. The hand-operated hydraulic refueling device as recited in claim 1, wherein the side of the guide plate (14) is in sealing contact with the pump mount (1); and a sealing ring (13) is arranged at the contact part of the guide plate (14) and the pump base (1).
6. The hand-operated hydraulic refueling device according to claim 1, wherein a pump body sealing nut sealing ring (7) is arranged at a contact position of the pump body sealing nut (8) and the first cavity of the pump body (4) for sealing.
7. The hand-operated hydraulic oiling device according to claim 5, wherein a handle gear sealing ring (10) is arranged at the connecting part of the gear shaft of the handle gear (9) and the pump body sealing nut (8).
8. The hand-operated hydraulic refueling device according to claim 1, further comprising a handle (6), wherein the handle (6) is fixedly connected with the crank (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911229231.9A CN110848132B (en) | 2019-12-04 | 2019-12-04 | Hand-operated hydraulic refueling device for aircraft |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911229231.9A CN110848132B (en) | 2019-12-04 | 2019-12-04 | Hand-operated hydraulic refueling device for aircraft |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110848132A true CN110848132A (en) | 2020-02-28 |
| CN110848132B CN110848132B (en) | 2021-08-06 |
Family
ID=69607731
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911229231.9A Active CN110848132B (en) | 2019-12-04 | 2019-12-04 | Hand-operated hydraulic refueling device for aircraft |
Country Status (1)
| Country | Link |
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| CN (1) | CN110848132B (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3817665A (en) * | 1973-04-20 | 1974-06-18 | Reliance Electric Co | Hydraulic pump or motor |
| CN2084525U (en) * | 1990-09-19 | 1991-09-11 | 侯致发 | Two-way pumping machine |
| CN2530067Y (en) * | 2001-08-06 | 2003-01-08 | 上海电气集团现代农业装备成套有限公司 | Geared oil pump |
| CN201723440U (en) * | 2010-08-19 | 2011-01-26 | 台州中海汽车附件有限公司 | Gear pump |
| CN104728104A (en) * | 2013-12-19 | 2015-06-24 | 四川高精净化设备有限公司 | Gear oil pump with filter device |
| CN106837784A (en) * | 2017-04-07 | 2017-06-13 | 夏三华 | It is a kind of to be suitable to the gear pump that the whole network distribution transmission ＆ distribution heating system is used |
| DE102017112699A1 (en) * | 2017-06-08 | 2018-12-13 | Schwäbische Hüttenwerke Automotive GmbH | External gear pump |
| CN208311031U (en) * | 2018-05-02 | 2019-01-01 | 南昌航空大学 | A kind of manual tower tooth speed change oil changing machine of simple portable |
-
2019
- 2019-12-04 CN CN201911229231.9A patent/CN110848132B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3817665A (en) * | 1973-04-20 | 1974-06-18 | Reliance Electric Co | Hydraulic pump or motor |
| CN2084525U (en) * | 1990-09-19 | 1991-09-11 | 侯致发 | Two-way pumping machine |
| CN2530067Y (en) * | 2001-08-06 | 2003-01-08 | 上海电气集团现代农业装备成套有限公司 | Geared oil pump |
| CN201723440U (en) * | 2010-08-19 | 2011-01-26 | 台州中海汽车附件有限公司 | Gear pump |
| CN104728104A (en) * | 2013-12-19 | 2015-06-24 | 四川高精净化设备有限公司 | Gear oil pump with filter device |
| CN106837784A (en) * | 2017-04-07 | 2017-06-13 | 夏三华 | It is a kind of to be suitable to the gear pump that the whole network distribution transmission ＆ distribution heating system is used |
| DE102017112699A1 (en) * | 2017-06-08 | 2018-12-13 | Schwäbische Hüttenwerke Automotive GmbH | External gear pump |
| CN208311031U (en) * | 2018-05-02 | 2019-01-01 | 南昌航空大学 | A kind of manual tower tooth speed change oil changing machine of simple portable |
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| Publication number | Publication date |
|---|---|
| CN110848132B (en) | 2021-08-06 |
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