CN108894847B - Control system of direct-push type single-cavity supercharging variable-discharge oil pump - Google Patents
Control system of direct-push type single-cavity supercharging variable-discharge oil pump Download PDFInfo
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- CN108894847B CN108894847B CN201810933783.7A CN201810933783A CN108894847B CN 108894847 B CN108894847 B CN 108894847B CN 201810933783 A CN201810933783 A CN 201810933783A CN 108894847 B CN108894847 B CN 108894847B
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M1/00—Pressure lubrication
- F01M1/02—Pressure lubrication using lubricating pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M1/00—Pressure lubrication
- F01M1/16—Controlling lubricant pressure or quantity
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M1/00—Pressure lubrication
- F01M1/02—Pressure lubrication using lubricating pumps
- F01M2001/0207—Pressure lubrication using lubricating pumps characterised by the type of pump
- F01M2001/0238—Rotary pumps
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Abstract
The application provides a control system of a direct-push type single-cavity supercharging variable displacement oil pump, which comprises a variable displacement vane pump, a main oil duct and a pilot valve, wherein the variable displacement vane pump comprises a feedback oil cavity, a variable sliding block and a variable spring; the pilot valve comprises a valve body, a valve core and a spring, wherein a first control cavity, a second control cavity and a spring cavity are arranged between the valve core and the inner wall of the valve body; the pilot valve is located on the oil path between the main oil duct and the feedback oil cavity, the main oil duct is connected to the first control cavity and the second control cavity through two independent oil paths, the first control cavity is always filled with pressure oil from the main oil duct, an on-off electromagnetic valve is arranged on the oil path between the second control cavity and the main oil duct, and the first control cavity and the feedback oil cavity can be in a communicating state or a disconnecting state along with the movement of the valve core in the valve body.
Description
Technical Field
The application relates to the technical field of lubricating systems of internal combustion engines, in particular to a control system of a single-cavity feedback variable displacement vane pump.
Background
The engine oil pump is used for supplying lubricating oil to each sliding part of the engine to ensure the normal operation of the engine, the power source is from the engine, the flow rate of the engine oil at the outlet end of the engine is in direct proportion to the rotating speed of the engine, and the rotating speed of the engine is a variable, so that the required lubricating oil flow rate and the rotating speed of the engine are not in direct proportion, and when the engine works in a high-speed section, the problem of overlarge engine oil flow rate can occur, and the waste of engine power is caused.
In the prior art, the flow control of the engine oil pump mainly comprises two modes, one is that a pressure relief valve is arranged at the outlet end of the pump, so that when the engine works in a low rotation speed section, the oil pressure at the outlet of the engine oil pump is gradually increased along with the gradual increase of the rotation speed; when the engine enters the high-speed section, the outlet oil pressure of the engine oil pump is higher than the preset pressure value of the pressure relief valve, the pressure relief valve starts to work, and part of engine oil is discharged, so that the engine oil pressure is maintained at a constant value.
Another type of variable flow oil pump is one that is provided with a mechanical flow control mechanism that is typically driven by oil pressure feedback at the outlet end of the oil pump, such as a vane-type variable flow oil pump. Compared with the first scheme, the variable flow oil pump is favorable for improving the lubricating performance of the high-speed section of the engine, but because the section regulated by the variable flow oil pump is less, the flow change reaction of the oil pump is delayed in the running process, and the fluctuation range of the oil pressure is large, so that the lubricating problem or the waste problem of the engine power when the engine rotates at a high speed can not be completely solved.
With the increasing development and popularization of variable displacement technology of engine lubricating system oil pumps, vane type oil pumps are widely used, and the existing vane type oil pumps comprise two variable forms of single-acting cavity feedback and double-acting cavity feedback, wherein the single-acting cavity feedback can be designed into a one-stage variable displacement mode, MAP control can be realized through an electrohydraulic proportional control valve, and the double-acting cavity feedback can be designed into a two-stage variable displacement mode.
Disclosure of Invention
The application aims to solve the technical problem of providing a control system of a direct-push type single-cavity supercharging variable displacement oil pump, which can realize a single-cavity two-stage variable displacement mode.
In order to solve the technical problems, the application adopts the following technical scheme: the control system of the direct-push type single-cavity supercharging variable-displacement oil pump comprises a variable-displacement vane pump, a main oil duct, an oil pan and a pilot valve, wherein the variable-displacement vane pump comprises a pump body, a feedback oil cavity, a rotor, a variable sliding block and a variable spring, the feedback oil cavity and the variable spring are respectively positioned at two sides of the variable sliding block, and under the action of oil pressure in the feedback oil cavity and the elasticity of the variable spring, the variable sliding block can radially move in a rotor cavity; the pilot valve comprises a valve body, a valve core and a spring, wherein a first control cavity, a second control cavity and a spring cavity are arranged between the valve core and the inner wall of the valve body; the pilot valve is located on an oil path between the main oil path and the feedback oil chamber, the main oil path is respectively connected to a first control chamber and a second control chamber of the pilot valve through two independent oil paths, the first control chamber is always filled with pressure oil from the main oil path, an on-off electromagnetic valve is arranged on the oil path between the second control chamber and the main oil path, and the first control chamber and the feedback oil chamber can be in a communicating state or a disconnecting state along with the movement of the valve core in the valve body.
As a preferable technical scheme, a main oil duct interface is arranged at a position, corresponding to a first control cavity, on a valve body of the pilot valve, a switch electromagnetic valve interface is arranged at a position, corresponding to a second control cavity, on the valve body, an exhaust hole is arranged at a position, corresponding to a spring cavity, on the valve body, a feedback oil cavity interface is also arranged on the valve body, and along with the movement of a valve core in the valve body, the feedback oil cavity interface and the first control cavity can be in a communicating state or a disconnecting state; the switch electromagnetic valve is provided with a P port, an A port and a T port, wherein the P port is communicated with the main oil duct, the A port is communicated with the second control cavity of the pilot valve, and the T port is communicated with the oil pan; the main oil duct interface is communicated with the main oil duct through an oil way, and the feedback oil cavity interface is communicated with the feedback oil cavity through an oil way;
in the stage of primary variable displacement, under the control of an ECU, a P port and an A port of an on-off electromagnetic valve are communicated, and main oil duct pressure oil enters a second control cavity of a pilot valve through the on-off electromagnetic valve, wherein in the stage, the first control cavity and the second control cavity of the pilot valve are filled with the main oil duct pressure oil; before the engine oil pressure of the main oil duct does not reach a set low-pressure variable pressure point, a closed state is formed between the feedback oil cavity interface and the first control cavity, oil pressure is not supplied in the feedback oil cavity, and at the moment, the eccentric quantity of the variable sliding block and the rotor is maximum; when the engine oil pressure of the main oil duct reaches a set low-pressure variable pressure point, the valve core of the pilot valve moves towards the spring cavity under the action of the engine oil pressure of the first control cavity and the second control cavity, so that the feedback oil cavity interface is communicated with the first control cavity, pressure oil in the first control cavity enters the feedback oil cavity, and the variable slider is pushed to compress the variable spring to radially move, so that the eccentric amount of the variable slider and the rotor is reduced, and the output displacement is reduced;
when the switching electromagnetic valve is switched to another working state under the control of the ECU, the P port and the A port of the switching electromagnetic valve are not communicated, the A port and the T port of the switching electromagnetic valve are communicated, the system enters a second-stage variable displacement stage, the first control cavity of the pilot valve is filled with main oil duct pressure oil in the second-stage variable displacement stage, and oil pressure is not supplied in the second control cavity; before the engine oil pressure of the main oil duct does not reach a set high-pressure variable pressure point, a closed state is formed between the feedback oil cavity interface and the first control cavity, oil pressure is not supplied in the feedback oil cavity, and at the moment, the eccentric quantity of the variable sliding block and the rotor is maximum; when the engine oil pressure of the main oil duct reaches a set high-pressure variable pressure point, the pilot valve core moves towards the spring cavity under the action of the engine oil pressure of the first control cavity, so that the feedback oil cavity interface is communicated with the first control cavity, pressure oil in the first control cavity enters the feedback oil cavity, the variable slider is pushed to compress the variable spring to radially move, the eccentric amount of the variable slider and the rotor is reduced, and accordingly output displacement is reduced.
The application can realize two-stage variable displacement of the single-cavity feedback vane pump by the combined application of the pilot valve and the switch electromagnetic valve, and has simple control and timely response. Meanwhile, the structure of the variable sliding block is improved, the feedback oil cavity and the variable spring are respectively arranged at two sides of the variable sliding block, and the eccentric amount of the variable sliding block and the rotor is adjusted by radial movement of the variable sliding block in the rotor cavity, so that a spring pressing block on the traditional variable sliding block is eliminated, and the internal structure of the oil pump is more compact.
Drawings
FIG. 1 is a schematic diagram of the control system of the present application in an unchanged phase;
FIG. 2 is a schematic diagram of the control system of the present application in a variable phase;
the reference numerals are:
10-variable displacement vane pump
11-pump body 12-feedback oil cavity 13-rotor
14-variable slider 15-variable spring
20-Pilot valve
21-valve body 22-valve core 23-spring
24-first control chamber 25-second control chamber 26-spring chamber
261-exhaust hole 27-main oil duct interface 28-switch electromagnetic valve interface
29-feedback oil chamber interface
30-switching the solenoid valve.
Detailed Description
The application will be further described with reference to examples and drawings, to which reference is made, but which are not intended to limit the scope of the application.
In the description of the present application, it should be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or number of technical features indicated. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise. In the description of the present application, it should be noted that, unless otherwise specified and defined, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, mechanically or electrically connected, may be in communication with each other between two elements, may be directly connected, or may be indirectly connected through an intermediate medium, and the specific meaning of the terms may be understood by those skilled in the art according to circumstances.
As shown in fig. 1 and 2, the preferred embodiments of the present application are: the control system of the direct-push type single-cavity supercharging variable displacement oil pump comprises a variable displacement vane pump 10, a main oil duct, an oil pan and a pilot valve 20, wherein the variable displacement vane pump 10 comprises a pump body 11, a feedback oil cavity 12, a rotor 13, a variable sliding block 14 and a variable spring 15, the feedback oil cavity 12 and the variable spring 15 are respectively positioned at two sides of the variable sliding block 14, and under the action of oil pressure in the feedback oil cavity 12 and elasticity of the variable spring 15, the variable sliding block 14 can radially move in the rotor cavity; the pilot valve 20 comprises a valve body 21, a valve core 22 and a spring 23, wherein a first control cavity 24, a second control cavity 25 and a spring cavity 26 are arranged between the valve core 22 and the inner wall of the valve body 21; the pilot valve 20 is located on an oil path between the main oil path and the feedback oil chamber 12, the main oil path is respectively connected to a first control chamber 24 and a second control chamber 25 of the pilot valve 20 through two independent oil paths, the first control chamber 24 is always filled with pressure oil from the main oil path, an on-off electromagnetic valve 30 is arranged on the oil path between the second control chamber 25 and the main oil path, and along with the movement of the valve core 22 in the valve body 21, the first control chamber 24 and the feedback oil chamber 12 can be in a communicating state or a disconnecting state.
A main oil duct interface 27 is arranged on the valve body 21 of the pilot valve 20 corresponding to the first control cavity 24, a switch electromagnetic valve interface 28 is arranged on the valve body 21 corresponding to the second control cavity 25, an exhaust hole 261 is arranged on the valve body 21 corresponding to the spring cavity 26, a feedback oil cavity interface 29 is also arranged on the valve body 21, and the feedback oil cavity interface 29 and the first control cavity 24 can be in a communicating or disconnecting state along with the movement of the valve core 22 in the valve body 21; the switch electromagnetic valve 30 is provided with a P port, an A port and a T port, wherein the P port is communicated with the main oil duct, the A port is communicated with the second control cavity 25 of the pilot valve 20, and the T port is communicated with the oil pan; the main oil duct interface 27 is communicated with the main oil duct through an oil way, and the feedback oil cavity interface 29 is communicated with the feedback oil cavity 12 through an oil way;
in the first-stage variable displacement stage, under the control of the ECU, the P port of the switching electromagnetic valve 30 is communicated with the A port, and the main oil duct pressure oil enters the second control cavity 25 of the pilot valve 20 through the switching electromagnetic valve 30, and in the stage, the first control cavity 24 and the second control cavity 25 of the pilot valve 20 are filled with the main oil duct pressure oil; before the oil pressure of the main oil passage does not reach the set low-pressure variable pressure point, the feedback oil cavity interface 29 and the first control cavity 24 are in a closed state, no oil pressure is supplied in the feedback oil cavity 12, and at the moment, the eccentric amount of the variable sliding block 14 and the rotor 13 is maximum; when the oil pressure of the main oil duct reaches a set low-pressure variable pressure point, the pilot valve core 22 moves towards the spring cavity 26 under the action of the oil pressure of the first control cavity 24 and the second control cavity 25, so that the feedback oil cavity interface 29 is communicated with the first control cavity 24, pressurized oil in the first control cavity 24 enters the feedback oil cavity 12, the variable slider 14 is pushed to compress the variable spring 15 to radially move, the eccentric amount of the variable slider 14 and the rotor 13 is reduced, and the output displacement is reduced;
when the switching electromagnetic valve 30 is switched to another working state under the control of the ECU, the P port and the A port of the switching electromagnetic valve 30 are not communicated, the A port is communicated with the T port, the system enters a second-stage variable displacement stage, the first control cavity 24 of the pilot valve 20 is filled with main oil duct pressure oil in the second-stage variable displacement stage, and no oil pressure is supplied in the second control cavity 25; before the oil pressure of the main oil passage does not reach the set high-pressure variable pressure point, the feedback oil cavity interface 29 and the first control cavity 24 are in a closed state, no oil pressure is supplied in the feedback oil cavity 12, and at the moment, the eccentric amount of the variable sliding block 14 and the rotor 13 is maximum; when the oil pressure of the main oil duct reaches a set high-pressure variable pressure point, the pilot valve core 22 moves towards the spring cavity 26 under the action of the oil pressure of the first control cavity 24, so that the feedback oil cavity interface 29 is communicated with the first control cavity 24, pressurized oil in the first control cavity 24 enters the feedback oil cavity 12, and the variable slider 14 is pushed to compress the variable spring 15 to radially move, so that the eccentric amount of the variable slider 14 and the rotor 13 is reduced, and the output displacement is reduced.
The application enables the single-cavity feedback vane pump to realize two-stage variable displacement through the combined application of the pilot valve 20 and the switch electromagnetic valve 30, and has simple control and timely response. Meanwhile, the structure of the variable sliding block 14 is improved, the feedback oil cavity 12 and the variable spring 15 are respectively arranged at two sides of the variable sliding block 14, and the eccentric amount of the variable sliding block 14 and the rotor 13 is adjusted by radial movement of the variable sliding block 14 in the rotor cavity, so that a spring pressing block on the traditional variable sliding block is eliminated, and the internal structure of the oil pump is more compact.
The foregoing embodiments are preferred embodiments of the present application, and in addition, the present application may be implemented in other ways, and any obvious substitution is within the scope of the present application without departing from the concept of the present application.
In order to facilitate understanding of the improvements of the present application over the prior art, some of the figures and descriptions of the present application have been simplified and some other elements have been omitted for clarity, as will be appreciated by those of ordinary skill in the art.
Claims (1)
1. The utility model provides a control system of direct-push type single chamber pressure boost becomes row oil pump, includes variable displacement vane pump (10), main oil duct, pilot valve (20), its characterized in that: the variable displacement vane pump (10) comprises a pump body (11), a feedback oil cavity (12), a rotor (13), a variable sliding block (14) and a variable spring (15), wherein the feedback oil cavity (12) and the variable spring (15) are respectively positioned at two sides of the variable sliding block (14), and under the action of oil pressure in the feedback oil cavity and the elasticity of the variable spring, the variable sliding block (14) can radially move in the rotor cavity; the pilot valve (20) comprises a valve body (21), a valve core (22) and a spring (23), wherein a first control cavity (24), a second control cavity (25) and a spring cavity (26) are arranged between the valve core (22) and the inner wall of the valve body (21); the pilot valve (20) is positioned on an oil path between a main oil path and the feedback oil cavity (12), the main oil path is respectively connected to a first control cavity (24) and a second control cavity (25) of the pilot valve (20) through two independent oil paths, the first control cavity (24) is always filled with pressure oil from the main oil path, an on-off electromagnetic valve (30) is arranged on the oil path between the second control cavity (25) and the main oil path, and the first control cavity (24) and the feedback oil cavity (12) can be in a communicating state or a disconnecting state along with the movement of the valve core (22) in the valve body (21);
a main oil duct interface (27) is arranged at a position, corresponding to the first control cavity (24), on the valve body (21) of the pilot valve (20), a switch electromagnetic valve interface (28) is arranged at a position, corresponding to the second control cavity (25), on the valve body (21), an exhaust hole (261) is arranged at a position, corresponding to the spring cavity (26), on the valve body (21), a feedback oil cavity interface (29) is further arranged on the valve body (21), and along with the movement of the valve core (22) in the valve body (21), the feedback oil cavity interface (29) and the first control cavity (24) can be in a communicating or disconnecting state; the switch electromagnetic valve (30) is provided with a P port, an A port and a T port, wherein the P port is communicated with the main oil duct, the A port is communicated with a second control cavity (25) of the pilot valve (20), and the T port is communicated with the oil pan; the main oil duct interface is communicated with the main oil duct through an oil way, and the feedback oil cavity interface (29) is communicated with the feedback oil cavity (12) through an oil way;
in the first-stage variable displacement stage, under the control of an ECU (electronic control unit), a P port of an on-off electromagnetic valve (30) is communicated with an A port, and main oil duct pressure oil enters a second control cavity (25) of a pilot valve (20) through the on-off electromagnetic valve (30), wherein in the stage, both the first control cavity (24) and the second control cavity (25) of the pilot valve (20) are filled with the main oil duct pressure oil; before the engine oil pressure of the main oil duct does not reach a set low-pressure variable pressure point, a closed state is formed between the feedback oil cavity interface (29) and the first control cavity (24), oil pressure is not supplied in the feedback oil cavity (12), and at the moment, the eccentric amount of the variable sliding block (14) and the rotor (13) is maximum; when the engine oil pressure of the main oil duct reaches a set low-pressure variable pressure point, the pilot valve core (22) moves towards the spring cavity (26) under the action of the engine oil pressure of the first control cavity (24) and the second control cavity (25), so that a feedback oil cavity interface (29) is communicated with the first control cavity (24), pressurized oil in the first control cavity (24) enters the feedback oil cavity (12), the variable slider (14) is pushed to compress the variable spring (15) to radially move, the eccentric amount of the variable slider (14) and the rotor (13) is reduced, and the output displacement is reduced;
when the switching electromagnetic valve (30) is switched to another working state under the control of the ECU, a P port and an A port of the switching electromagnetic valve (30) are not communicated, the A port is communicated with the T port, the system enters a two-stage variable displacement stage, in the two-stage variable displacement stage, a first control cavity (24) of the pilot valve (20) is filled with main oil duct pressure oil, and the second control cavity (25) is not supplied with oil pressure; before the engine oil pressure of the main oil duct does not reach a set high-pressure variable pressure point, a closed state is formed between the feedback oil cavity interface (29) and the first control cavity (24), oil pressure is not supplied in the feedback oil cavity (12), and at the moment, the eccentric amount of the variable sliding block (14) and the rotor (13) is maximum; when the engine oil pressure of the main oil duct reaches a set high-pressure variable pressure point, the pilot valve core (22) moves towards the spring cavity (26) under the action of the engine oil pressure of the first control cavity (24), so that a feedback oil cavity interface (29) is communicated with the first control cavity (24), pressure oil in the first control cavity (24) enters the feedback oil cavity (12), the variable slider (14) is pushed to compress the variable spring (15) to radially move, the eccentric quantity of the variable slider (14) and the rotor (13) is reduced, and accordingly output displacement is reduced.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810933783.7A CN108894847B (en) | 2018-08-16 | 2018-08-16 | Control system of direct-push type single-cavity supercharging variable-discharge oil pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810933783.7A CN108894847B (en) | 2018-08-16 | 2018-08-16 | Control system of direct-push type single-cavity supercharging variable-discharge oil pump |
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| Publication Number | Publication Date |
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| CN108894847A CN108894847A (en) | 2018-11-27 |
| CN108894847B true CN108894847B (en) | 2023-10-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810933783.7A Active CN108894847B (en) | 2018-08-16 | 2018-08-16 | Control system of direct-push type single-cavity supercharging variable-discharge oil pump |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110017190B (en) * | 2019-05-14 | 2023-12-26 | 富奥汽车零部件股份有限公司 | Method and device for controlling two-stage variable oil pump by combined valve |
| CN113719332A (en) * | 2020-05-25 | 2021-11-30 | 比亚迪股份有限公司 | Engine lubricating system and engine |
| CN111637054A (en) * | 2020-05-28 | 2020-09-08 | 奇瑞汽车股份有限公司 | Vane pump |
| CN114370594A (en) * | 2021-12-29 | 2022-04-19 | 四川航天世源科技有限公司 | Variable displacement oil pump with supercharging variable |
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| JP2002147374A (en) * | 2000-11-13 | 2002-05-22 | Unisia Jecs Corp | Variable displacement vane pump |
| CN105114146A (en) * | 2015-09-28 | 2015-12-02 | 湖南机油泵股份有限公司 | Control system of main oil duct feedback single-cavity two-stage variable-displacement vane pump |
| JP2018013070A (en) * | 2016-07-20 | 2018-01-25 | マツダ株式会社 | Oil supply device for engine |
| CN208594984U (en) * | 2018-08-16 | 2019-03-12 | 湖南机油泵股份有限公司 | A kind of direct-push single-chamber pressurization becomes the control system of row's lubricating oil pump |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6896489B2 (en) * | 2000-12-12 | 2005-05-24 | Borgwarner Inc. | Variable displacement vane pump with variable target regulator |
| JP2010526237A (en) * | 2007-05-04 | 2010-07-29 | ボーグワーナー・インコーポレーテッド | Hydraulic pump with variable flow rate and pressure and improved open loop electrical control |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002147374A (en) * | 2000-11-13 | 2002-05-22 | Unisia Jecs Corp | Variable displacement vane pump |
| CN105114146A (en) * | 2015-09-28 | 2015-12-02 | 湖南机油泵股份有限公司 | Control system of main oil duct feedback single-cavity two-stage variable-displacement vane pump |
| JP2018013070A (en) * | 2016-07-20 | 2018-01-25 | マツダ株式会社 | Oil supply device for engine |
| CN208594984U (en) * | 2018-08-16 | 2019-03-12 | 湖南机油泵股份有限公司 | A kind of direct-push single-chamber pressurization becomes the control system of row's lubricating oil pump |
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| CN108894847A (en) | 2018-11-27 |
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