CN102966407B - Oil pump and engine using same - Google Patents
Oil pump and engine using same Download PDFInfo
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- CN102966407B CN102966407B CN201210504806.5A CN201210504806A CN102966407B CN 102966407 B CN102966407 B CN 102966407B CN 201210504806 A CN201210504806 A CN 201210504806A CN 102966407 B CN102966407 B CN 102966407B
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- 239000003921 oil Substances 0.000 claims description 322
- 239000010705 motor oil Substances 0.000 claims description 45
- 238000007789 sealing Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 abstract description 7
- 238000005461 lubrication Methods 0.000 abstract description 5
- 238000006073 displacement reaction Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The invention provides an oil pump and an engine using the same, relates to the technical field of engine lubrication, and solves the problem that the conventional oil pump applies idle work in the pressure relief process, so that the mechanical energy of the engine is lost and the economic efficiency of the engine is reduced. The oil pump comprises an oil inlet, a rotor, a first oil cavity and an oil outlet which are communicated in sequence, and further comprises an electric control unit, a pressure sensor and an electric control valve, wherein the pressure sensor is arranged at the oil outlet and electrically connected with the electric control unit; the electric control unit is also electrically connected with the electric control valve; the pressure sensor is used for detecting the pressure of oil at the oil outlet; the electric control unit is used for outputting a first control signal to the electric control valve when determining that the pressure value of the oil at the oil outlet detected by the pressure sensor is more than a first preset pressure value; and the electric control valve is used for communicating the oil outlet with the oil inlet according to the first control signal.
Description
Technical Field
The invention relates to the technical field of engine lubrication, in particular to an oil pump and an engine using the same.
Background
The oil pump is one of important parts in the engine and carries the function of providing circulating power for the oil in the engine. The oil pump may force oil from the sump to be delivered to various lubrication sites in the engine lubrication system such that the oil lubricates the various lubrication sites.
The oil pump comprises a driving belt wheel (chain wheel), an oil inlet, a stator (adjusting ring), a rotor, an oil cavity, an oil outlet and the like. The driving belt wheel (chain wheel) is connected with the power output end of the engine and used for driving the rotor, so that the rotor obtains power from the engine. The oil inlet is communicated with the rotor, and engine oil reaches the rotor through the oil inlet. The rotor pressurizes the engine oil, so that the engine oil with a certain pressure flows into an oil chamber communicated with the rotor. Because the oil chamber is also communicated with the oil outlet which is communicated with the main oil gallery, the engine oil flowing out of the oil chamber finally reaches the main oil gallery.
The higher the rotation speed of the power output end of the engine is, the higher the rotation speed of a driving belt wheel (chain wheel) is, the larger the displacement of the oil pump is, and the larger the oil pressure in the oil pump is. If the rotating speed of a driving belt wheel (chain wheel) of the oil pump is too high, the displacement of the oil pump is too large, and the oil pressure is increased too fast.
Therefore, a pressure relief valve must be provided in the oil pump to relieve the oil pump. When the oil pressure in the oil pump exceeds a specified pressure value, the excess oil overcomes the elastic force of a spring in the relief valve to open the relief valve, thereby discharging a part of the oil to reduce the oil pressure.
In the process of releasing pressure of the engine oil pump, the engine oil overcomes the elastic force of a spring in the pressure release valve to do work, and the work belongs to useless work, so that the mechanical energy loss of the engine can be caused, and the economical efficiency of the engine is reduced.
Disclosure of Invention
The embodiment of the invention provides an oil pump and an engine using the same, and solves the problem that the existing oil pump does useless work in the pressure relief process to cause the mechanical energy loss of the engine, so that the economical efficiency of the engine is reduced.
In order to achieve the above purpose, the embodiment of the invention adopts the following technical scheme:
an oil pump comprises an oil inlet, a rotor, a first oil cavity and an oil outlet which are communicated in sequence, and further comprises an electric control unit, a pressure sensor and an electric control valve; the pressure sensor is arranged at the oil outlet and is electrically connected with the electric control unit, and the electric control unit is also electrically connected with the electric control valve; the pressure sensor is used for detecting the pressure of the engine oil at the oil outlet; the electronic control unit is used for outputting a first control signal to the electronic control valve when the pressure value of the engine oil at the oil outlet detected by the pressure sensor is determined to be greater than a preset first pressure value; the electric control valve is used for communicating the oil outlet with the oil inlet according to the first control signal.
Preferably, the oil pump further comprises a second oil chamber; the rotor, the second oil cavity and the oil outlet are communicated in sequence; the electronic control unit is further used for outputting a second control signal to the electronic control valve when the pressure value of the engine oil at the oil outlet detected by the pressure sensor is determined to be smaller than a second pressure value preset in the electronic control unit; the electric control valve is also used for communicating the second oil chamber with the oil outlet according to the second control signal; or, the electronic control unit is further configured to output a third control signal to the electronic control valve when it is determined that the pressure value of the engine oil at the oil outlet detected by the pressure sensor is equal to a second pressure value preset in the electronic control unit; the electric control valve is also used for communicating the second oil cavity with the oil inlet according to the third control signal; or, the electronic control unit is further configured to output a fourth control signal to the electronic control valve when it is determined that the pressure value of the engine oil at the oil outlet detected by the pressure sensor is greater than a second pressure value preset in the electronic control unit; the electric control valve is also used for communicating the second oil cavity and the oil outlet with the oil inlet according to the fourth control signal.
Preferably, the electric control valve comprises a sealing cavity, and an oil outlet connecting hole, a second oil cavity connecting hole and an oil inlet connecting hole are formed in the surface of the sealing cavity; the oil outlet connecting hole is communicated with the oil outlet, the second oil cavity connecting hole is communicated with the second oil cavity, and the oil inlet connecting hole is communicated with the oil inlet; when the electric control valve receives the second control signal, the second oil cavity connecting hole and the oil outlet connecting hole are opened, and the oil inlet connecting hole is closed, so that the second oil cavity is communicated with the oil outlet through the sealed cavity; when the electric control valve receives the third control signal, the second oil cavity connecting hole and the oil inlet connecting hole are opened, and the oil outlet connecting hole is closed, so that the second oil cavity is communicated with the oil inlet through the sealing cavity; when the electric control valve receives the fourth control signal, the second oil cavity connecting hole, the oil outlet connecting hole and the oil inlet connecting hole are all opened, so that the second oil cavity and the oil outlet are communicated with the oil inlet through the sealing cavity.
Preferably, the electrically controlled valve is a solenoid valve.
The oil pump further comprises an oil collector, and the electric control valve is further used for sequentially communicating the oil outlet, the oil collector and the oil inlet according to the first control signal.
Preferably, the electric control unit is an electronic control unit, a single chip microcomputer or a microcontroller.
An engine is characterized by comprising the oil pump.
In the oil pump and the engine using the same provided by the embodiment of the invention, the oil outlet is communicated with the oil inlet by controlling the electric control valve through the electric control unit, so that the pressure of the oil is relieved. The engine oil does not need to overcome external force to do work, so that the engine oil pump is prevented from doing useless work, the mechanical energy loss of the engine is reduced, and the economical efficiency of the engine is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below.
FIG. 1 is a schematic diagram of an oil pump according to an embodiment of the present invention during pressure relief;
fig. 2a is a schematic diagram of another oil pump according to an embodiment of the present invention when the electronic control unit determines that a pressure value of oil at an oil outlet detected by the pressure sensor is smaller than a second pressure value preset in the electronic control unit;
FIG. 2b is a schematic diagram of the oil pump of FIG. 2a when the electronic control unit determines that the pressure value of the oil at the oil outlet detected by the pressure sensor is equal to a second pressure value preset in the electronic control unit;
FIG. 2c is a schematic diagram of the oil pump shown in FIG. 2a when the electronic control unit determines that a pressure value of the oil at the oil outlet detected by the pressure sensor is greater than a second pressure value preset in the electronic control unit;
FIG. 3 is a schematic diagram illustrating a pressure relief of another oil pump according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of an electrical control valve of the oil pump shown in FIG. 2 a;
fig. 5 is a schematic top view of the oil pump shown in fig. 2 a.
Detailed Description
The embodiment of the invention provides an oil pump, as shown in fig. 1, the oil pump 13 includes an oil inlet 11, a rotor 131, a first oil chamber 134, an oil outlet 133, an electronic control unit 14, a pressure sensor 135, and an electronic control valve 136, which are sequentially communicated. A pressure sensor 135 is provided at the oil outlet 133 and is electrically connected to the electronic control unit 14, the electronic control unit 14 also being electrically connected to the electronic control valve 136.
The pressure sensor 135 is used for detecting the pressure of the engine oil at the oil port 133; the electronic control unit 14 is configured to output a first control signal to the electronic control valve 136 when determining that the pressure value of the engine oil at the oil outlet 133 detected by the pressure sensor 135 is greater than a preset first pressure value; the electric control valve 136 is used for communicating the oil outlet 133 with the oil inlet 11 according to a first control signal.
In the process of using the oil pump provided by the embodiment of the invention, because the oil pump 13 comprises the oil inlet 11, the rotor 131, the first oil chamber 134 and the oil outlet 133 which are sequentially communicated, the oil can flow into the first oil chamber 134 via the oil inlet 11 and the rotor 131 and then flow out to the main oil gallery via the oil outlet 133. The oil pump also includes an electronic control unit 14, a pressure sensor 135 and an electronic control valve 136. Since the pressure sensor 135 is provided at the oil outlet 133 and electrically connected to the electronic control unit 14, the electronic control unit 14 is also electrically connected to the electronic control valve 136. And the pressure sensor 135 can detect the pressure of the oil at the oil port 133.
When the electronic control unit 14 determines that the pressure value of the engine oil at the oil outlet 133 detected by the pressure sensor 135 is greater than the preset first pressure value, the electronic control unit 14 outputs a first control signal to the electronic control valve 136, and the electronic control valve 136 communicates the oil outlet 133 with the oil inlet 11 according to the first control signal, so that part of the engine oil at the oil outlet 133 flows to the oil inlet 11, and the engine oil pressure at the oil outlet 133 is reduced to achieve the purpose of pressure relief.
In the oil pump provided by the embodiment of the invention, the oil outlet is communicated with the oil inlet by controlling the electric control valve through the electric control unit, so that the pressure of the oil is relieved. The engine oil does not need to overcome external force to do work, so that the engine oil pump is prevented from doing useless work, the mechanical energy loss of the engine is reduced, and the economical efficiency of the engine is improved.
In the oil pump provided in the above embodiment, as shown in fig. 2a, fig. 2b, fig. 2c and fig. 5, since the oil pump 13 may further include the second oil chamber 21, wherein the rotor 131, the second oil chamber 21 and the oil outlet 133 are sequentially communicated, the oil flowing out from the rotor 131 can flow into the first oil chamber 134, and can also flow into the second oil chamber 21 and then flow into the oil outlet 133.
Referring to fig. 2a, the electronic control unit 14 is further configured to output a second control signal to the electronic control valve 136 when it is determined that the pressure value of the engine oil at the oil outlet 133 detected by the pressure sensor 135 is smaller than a second pressure value preset in the electronic control unit 14; meanwhile, the electronic control valve 136 is further configured to communicate the second oil chamber 21 with the oil outlet 133 according to a second control signal, so that the engine oil in the second oil chamber 22 flows to the oil outlet 133, and therefore the engine oil in the first oil chamber 134 and the engine oil in the second oil chamber 21 flow into the oil outlet 133 at the same time, so that the displacement of the engine oil is increased, and the engine oil pressure at the oil outlet 133 is increased to gradually reach the value equal to a second pressure value preset in the electronic control unit 14.
Referring to fig. 2b, the electronic control unit 14 is further configured to output a third control signal to the electronic control valve 136 when it is determined that the pressure value of the engine oil at the oil outlet 133 detected by the pressure sensor 135 is equal to a second pressure value preset in the electronic control unit 14; the electrically controlled valve 136 is also used for communicating the second oil chamber 21 with the oil inlet 11 according to the third control signal, so that the oil flowing into the second oil chamber 21 flows back to the oil inlet 11, thus corresponding to only the first oil chamber 134 supplying oil, to keep the pressure at the oil outlet 133 constant.
Referring to fig. 2c, when the electronic control unit 14 is further configured to determine that the pressure value of the engine oil at the oil outlet 133 detected by the pressure sensor 135 is greater than the second pressure value preset in the electronic control unit 14, the electronic control unit 14 outputs a fourth control signal to the electronic control valve 136; the electric control valve 136 is further configured to communicate both the second oil chamber 21 and the oil outlet 133 with the oil inlet 11 according to a fourth control signal, so that the engine oil flowing into the second oil chamber 21 flows back to the oil inlet 11, the engine oil flowing into the oil outlet 133 flows into the oil inlet 11, and the pressure at the oil outlet 133 is reduced to achieve the purpose of pressure relief.
Wherein, the second pressure value in the above embodiment may be equal to the first pressure value.
Obviously, in the oil pump provided in the above embodiment, the oil displacement and the oil pressure at the oil outlet can be adjusted in real time due to the combined action of the pressure sensor, the second oil chamber, the electronic control valve and the electronic control unit. Meanwhile, compared with the existing oil pump adopting hydraulic control, the control process of the oil pump adopts electric control to be more accurate and faster.
In addition, in the existing quantitative oil pump, the designed theoretical displacement is large, so the volume of the quantitative oil pump is large, and the occupied space is large, which is not beneficial to the arrangement in an engine. In the oil pump provided in the above embodiment, even if the oil displacement is required to be large, the volume of the oil pump does not need to be increased. Therefore, the oil pump provided by the embodiment occupies a smaller space and is more beneficial to arrangement in an engine.
In addition, in the conventional oil metering pump, when the engine rotates at a high speed, the oil pressure in the oil metering pump is high, and the oil with high pressure causes high mechanical energy loss of the oil metering pump. The oil pump provided by the embodiment has the advantages that the electric control unit controls the electric control valve to communicate the oil outlet with the oil inlet, so that the oil is decompressed, and the mechanical energy loss of the oil pump at high rotating speed of an engine is reduced.
Aiming at the existing variable oil pump, in the process of realizing variable displacement of engine oil, an adjusting ring in the variable oil pump needs to overcome the elastic force of a spring to do work, and the mechanical energy loss is large. In the oil pump provided by the embodiment, the electric control unit is adopted to control the electric control valve to realize different oil discharge capacities, so that the mechanical energy loss of the variable oil pump is reduced.
In the oil pump provided in the foregoing embodiment, as shown in fig. 4, the electronic control valve 136 may include a seal cavity, and the surface of the seal cavity is provided with an oil outlet connection hole 41, a second oil chamber connection hole 42, and an oil inlet connection hole 43, where the oil outlet connection hole 41 is communicated with the oil outlet 133, the second oil chamber connection hole 42 is communicated with the second oil chamber 21, and the oil inlet connection hole 43 is communicated with the oil inlet 11.
When the electronic control valve 136 receives the second control signal, the second oil chamber connecting hole 42 and the oil outlet connecting hole 41 are opened, and the oil inlet connecting hole 43 is closed, so that the second oil chamber 21 and the oil outlet 133 are communicated through the sealed cavity, and the engine oil in the second oil chamber 22 flows out through the second oil chamber connecting hole 42 and then flows to the oil outlet 133 through the oil outlet connecting hole 41.
When the electric control valve 136 receives the third control signal, the second oil chamber connecting hole 42 and the oil inlet connecting hole 43 are opened, and the oil outlet connecting hole 41 is closed, so that the second oil chamber 21 is communicated with the oil inlet 11 through the seal cavity, and the engine oil flowing into the second oil chamber 21 flows out through the second oil chamber connecting hole 42 and then flows back to the oil inlet 11 through the oil inlet connecting hole 43.
When the electric control valve 136 receives the fourth control signal, the second oil chamber connecting hole 42, the oil outlet connecting hole 41 and the oil inlet connecting hole 43 are all opened, so that the second oil chamber 21, the oil outlet 133 and the oil inlet 11 are both communicated via the sealed cavity, the engine oil flowing into the second oil chamber 21 flows back to the oil outlet 133 via the oil inlet connecting hole 43 through the second oil chamber connecting hole 42, and the engine oil at the oil outlet 133 flows into the oil inlet 11 via the oil outlet connecting hole 41 and the oil inlet connecting hole 43.
Since the oil outlet connection hole 41, the second oil chamber connection hole 42, and the oil inlet connection hole 43 can be opened and closed accordingly when the electronic control valve 136 receives different control signals, communication of the respective oil passages can be achieved. The electric control valve 136 is easy to control the connection holes to open and close.
In the oil pump provided by the above embodiment, the electronic control valve 136 may be an electromagnetic valve, and the electromagnetic valve has a fast response speed, high reliability and low cost.
The oil pump provided in the foregoing embodiment may further include, as shown in fig. 3, an oil collector 31, an electronic control valve 136, and is further configured to sequentially communicate the oil outlet 133, the oil collector 31, and the oil inlet 11 according to a first control signal, so that the oil can flow out from the oil outlet 133, pass through the oil collector 31, and flow into the oil inlet, so that the oil can be collected by the oil collector 31.
In the oil pump provided in the above embodiment, the electronic control Unit 14 is an Electronic Control Unit (ECU), a single chip microcomputer or a microcontroller. Because the electronic control unit, the single chip microcomputer or the microcontroller is convenient for electric control and intelligence and has high reliability, the control effect of the engine oil pump is better.
The embodiment of the invention also provides an engine which comprises the oil pump provided by the embodiment. In the pressure relief process of the engine oil pump, the electric control valve is controlled by the electric control unit to communicate the oil outlet with the oil inlet, so that the engine oil is relieved. The engine oil does not need to overcome external force to do work, so that the engine oil pump is prevented from doing useless work, the mechanical energy loss of the engine is reduced, and the economical efficiency of the engine is improved.
The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (6)
1. An oil pump comprises an oil inlet, a rotor, a first oil cavity and an oil outlet which are communicated in sequence, and is characterized by further comprising an electric control unit, a pressure sensor and an electric control valve;
the pressure sensor is arranged at the oil outlet and is electrically connected with the electric control unit, and the electric control unit is also electrically connected with the electric control valve;
the pressure sensor is used for detecting the pressure of the engine oil at the oil outlet;
the electronic control unit is used for outputting a first control signal to the electronic control valve when the pressure value of the engine oil at the oil outlet detected by the pressure sensor is determined to be greater than a preset first pressure value;
the electric control valve is used for communicating the oil outlet with the oil inlet according to the first control signal;
the oil pump also comprises a second oil cavity; the rotor, the second oil cavity and the oil outlet are communicated in sequence;
the electronic control unit is further used for outputting a second control signal to the electronic control valve when the pressure value of the engine oil at the oil outlet detected by the pressure sensor is determined to be smaller than a second pressure value preset in the electronic control unit;
the electric control valve is also used for communicating the second oil chamber with the oil outlet according to the second control signal; or,
the electronic control unit is further used for outputting a third control signal to the electronic control valve when the pressure value of the engine oil at the oil outlet detected by the pressure sensor is determined to be equal to a second pressure value preset in the electronic control unit;
the electric control valve is also used for communicating the second oil cavity with the oil inlet according to the third control signal; or,
the electronic control unit is further used for outputting a fourth control signal to the electronic control valve when the pressure value of the engine oil at the oil outlet detected by the pressure sensor is determined to be greater than a second pressure value preset in the electronic control unit;
the electric control valve is also used for communicating the second oil cavity and the oil outlet with the oil inlet according to the fourth control signal.
2. The oil pump of claim 1, wherein the electrical control valve comprises a seal cavity, and an oil outlet connecting hole, a second oil chamber connecting hole and an oil inlet connecting hole are formed in the surface of the seal cavity;
the oil outlet connecting hole is communicated with the oil outlet, the second oil cavity connecting hole is communicated with the second oil cavity, and the oil inlet connecting hole is communicated with the oil inlet;
when the electric control valve receives the second control signal, the second oil cavity connecting hole and the oil outlet connecting hole are opened, and the oil inlet connecting hole is closed, so that the second oil cavity is communicated with the oil outlet through the sealed cavity;
when the electric control valve receives the third control signal, the second oil cavity connecting hole and the oil inlet connecting hole are opened, and the oil outlet connecting hole is closed, so that the second oil cavity is communicated with the oil inlet through the sealing cavity;
when the electric control valve receives the fourth control signal, the second oil cavity connecting hole, the oil outlet connecting hole and the oil inlet connecting hole are all opened, so that the second oil cavity and the oil outlet are communicated with the oil inlet through the sealing cavity.
3. The oil pump of claim 1, wherein the electrically controlled valve is a solenoid valve.
4. The oil pump of claim 1, further comprising an oil collector, wherein the electrically controlled valve is further configured to sequentially communicate the oil outlet, the oil collector, and the oil inlet according to the first control signal.
5. The oil pump of claim 1, wherein the electronic control unit is a single chip microcomputer.
6. An engine comprising the oil pump of any one of claims 1 to 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210504806.5A CN102966407B (en) | 2012-11-29 | 2012-11-29 | Oil pump and engine using same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210504806.5A CN102966407B (en) | 2012-11-29 | 2012-11-29 | Oil pump and engine using same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102966407A CN102966407A (en) | 2013-03-13 |
| CN102966407B true CN102966407B (en) | 2015-06-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210504806.5A Expired - Fee Related CN102966407B (en) | 2012-11-29 | 2012-11-29 | Oil pump and engine using same |
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| Country | Link |
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| CN (1) | CN102966407B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105179044B (en) * | 2015-09-29 | 2018-08-07 | 上海幸福摩托车有限公司 | A kind of engine variable oil pump system and its control method |
| CN106917949A (en) * | 2015-12-28 | 2017-07-04 | 长城汽车股份有限公司 | Lubricating oil pump and engine assembly |
| CN110261091B (en) * | 2019-07-09 | 2024-07-05 | 富奥汽车零部件股份有限公司 | Variable pump dry test method and device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN200985813Y (en) * | 2006-12-06 | 2007-12-05 | 比亚迪股份有限公司 | Engine oil pressure-limiting oilchannel |
| CN101435529A (en) * | 2008-12-17 | 2009-05-20 | 奇瑞汽车股份有限公司 | Engine oil pump |
| CN102032015A (en) * | 2009-09-29 | 2011-04-27 | 湖南机油泵股份有限公司 | Oil expelling-preventing safe oil pump |
| CN102191967A (en) * | 2010-03-01 | 2011-09-21 | 通用汽车环球科技运作有限责任公司 | Control system for a variable capacity engine oil pump |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070084431A1 (en) * | 2005-10-17 | 2007-04-19 | Omachi Steven T | Fluid pump and method |
| US8720849B2 (en) * | 2011-03-31 | 2014-05-13 | Magna Powertrain Inc. | Low gain pressure relief valve for a fluid pump |
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2012
- 2012-11-29 CN CN201210504806.5A patent/CN102966407B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN200985813Y (en) * | 2006-12-06 | 2007-12-05 | 比亚迪股份有限公司 | Engine oil pressure-limiting oilchannel |
| CN101435529A (en) * | 2008-12-17 | 2009-05-20 | 奇瑞汽车股份有限公司 | Engine oil pump |
| CN102032015A (en) * | 2009-09-29 | 2011-04-27 | 湖南机油泵股份有限公司 | Oil expelling-preventing safe oil pump |
| CN102191967A (en) * | 2010-03-01 | 2011-09-21 | 通用汽车环球科技运作有限责任公司 | Control system for a variable capacity engine oil pump |
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| CN102966407A (en) | 2013-03-13 |
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