CN104100825B - Displacement-variable oil pump - Google Patents
Displacement-variable oil pump Download PDFInfo
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- CN104100825B CN104100825B CN201310117004.3A CN201310117004A CN104100825B CN 104100825 B CN104100825 B CN 104100825B CN 201310117004 A CN201310117004 A CN 201310117004A CN 104100825 B CN104100825 B CN 104100825B
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Abstract
The invention discloses a kind of displacement-variable oil pump, which includes lubricating oil pump body, the lubricating oil pump body includes eccentric hoop, the first separate chamber and the second chamber, first chamber and the outlet oil communication of lubricating oil pump, and first segment head piece and the second restriction, the first segment head piece is connected with the import in second chamber, and second restriction is connected with the outlet in second chamber；Wherein when the oil pressure of the outlet oil circuit is more than first pressure threshold value, the oil pressure in first chamber can force the eccentric hoop to promote towards the direction for reducing machine oil pumpage；When the oil pressure for exporting oil circuit continues to rise to more than second pressure threshold value, the first segment head piece is opened, and first chamber is connected with second chamber by the first segment head piece, and sets up the oil pressure that the opposing eccentric hoop is promoted in second chamber.Present configuration is simple, reliable, low cost, while oil-saving effect significantly, is applicable to various vehicular engines.
Description
Technical field
The present invention relates to a kind of suitable for Vehicular internal combustion engine, variable displacement that is particularly suitable but being not limited to small displacement engine
Lubricating oil pump.
Background technology
It is well known that Modern Vehicle Engine nearly all provides lubrication and hydraulic-driven using lubricating oil pump, for this purpose, it is this
Engine will also provide part energy to drive lubricating oil pump.Consumption with petroleum resources and the demand to environmental protection, society
Can and the personal requirement more and more higher to automobile fuel ecomomy, reduce the energy ezpenditure of lubricating oil pump into Liao Ge engine works and
One concern target of main engine plants.Displacement-variable oil pump has begun to come into the market at present, general single stage Variable discharge capacity machine
Oil pump replaces the pressure release of traditional quantitative pump so as to reduce the driving torque of oil pump in high speed to reduce discharge capacity, can receive one
Fixed energy-saving effect, but can not show in middle low speed, and middle low speed is exactly the most frequently used operating mode of most drivers.
And if the discharge capacity of low speed and pressure in reducing by force, then, in high speed because discharge capacity deficiency can cause oil pressure not enough, affect to send out
Motivation safety.For this purpose, occurring in that two-stage variable displacement oil pump on market, it has two kinds of mode of operations, can be fast during low-voltage
The low discharge capacity of prompt drop and pressure, to reduce oil consumption；The safety at a high speed with engine during hot idling is can guarantee that during high pressure mode.But,
Two-stage variable displacement oil pump structure becomes very complicated, while will also increase electrical and electronic component, cost is very high, and reliability drops
Low.On the basis of two-stage (two-speed) pump, controllable oil pump is also under development, but cost is higher, while considerably increasing in engine calibration
Hold, thus promote and be restricted.
The Chinese invention application of Publication No. CN102364205A discloses a kind of displacement-variable oil pump.Described can be variable
Displacement oil pump includes the stator and rotor of eccentric setting and oil return line control chamber.Flexible member is set on the stator.When return
In oil circuit control chamber, oil pressure increases when precompression on flexible member is overcome, stator rotation, and changes stator and rotor
Between eccentricity so that discharge capacity reduce.It is seen that the pressure that discharge capacity reduces with flexible member is produced is linear.This
The lubricating oil pump of structure achieve can variable displacement, but exist defect be：After engine speed rises, as discharge capacity reduces
Too fast, lubricating oil pump cannot persistently supply oil pressure needed for engine.
Content of the invention
The technical problem to be solved in the present invention is to provide a kind of simple, inexpensive, reliable displacement-variable oil pump, realizes
Reduce oil pump capacity and oil duct pressure during middle low speed, discharge capacity reduces easing up to ensure pressure during high speed, realizes covering full working scope
Energy is saved.
The present invention is employed the following technical solutions.
A kind of displacement-variable oil pump, it include that lubricating oil pump body, the lubricating oil pump body include eccentric hoop；Separate
The outlet oil communication of one chamber and the second chamber, first chamber and lubricating oil pump；And first segment head piece and the second restriction, described
First segment head piece is connected with the import in second chamber, and second restriction is connected with the outlet in second chamber；Wherein when
When the oil pressure of the outlet oil circuit is more than first pressure threshold value, the oil pressure in first chamber can force the eccentric hoop towards making
The direction that machine oil pumpage reduces promotes；When the oil pressure of the outlet oil circuit continues to rise to more than second pressure threshold value, described
First segment head piece is opened, and first chamber is connected with second chamber by the first segment head piece, and described second
The oil pressure that the opposing eccentric hoop is promoted is set up in chamber.
First pressure threshold value and second pressure threshold value can be according to set by the work requirements of lubricating oil pump, and corresponding respectively is machine oil
Pump low speed（Or middle low speed）Operating mode and high-speed working condition.Under speed operation, the first chamber is worked；Under high-speed working condition, the first chamber
With the second chamber collective effect.
Preferably, the eccentric hoop is provided with flexible member, and the flexible member has the corresponding first pressure threshold value
Initializaing variable pressure.Preferably, the initializaing variable pressure is opened far below the relief valve of fixed displacement lubricating oil pump less than 300KPa
Pressure is opened, while having discharge capacity faster to reduce speed, to reduce oil pump capacity and engine oil pressure, reduces energy ezpenditure.
Above-mentioned displacement-variable oil pump, when pressure exceedes certain setting value, i.e. second pressure threshold value, will outlet or main oil
Road pressure introduces the second chamber after the pressure regulation that throttles, and making discharge capacity reduce speed reduces, to obtain high engine oil pressure in high speed,
Ensure engine health.The initial oil pressure value that the discharge capacity of the setting increases back can be determined by engine characteristics that such as piston cooling is sprayed
Pressure and corresponding working speed needed for mouth metered flow etc..
Preferably, the lubricating oil pump body also includes the safety valve on the outlet oil circuit, when the outlet oil circuit
Oil pressure when finally rising to more than three pressure thresholds, the safety valve is opened.
Above-mentioned displacement-variable oil pump, when pressure exceedes maximum pressure demand, safety valve is opened, rapid pressure release, with
The special operation conditions such as reply cold-starting, reduce energy ezpenditure and ensure engine health.
Preferably, the eccentric hoop diametrically extends and is provided with protuberance, and the flexible member is located at the protuberance
Between side and the lubricating oil pump body, the opposite side of the protuberance is in first chamber.
Preferably, first chamber and second chamber are each surround along the periphery of the eccentric hoop.
Preferably, separated by first seal between the one end in the one end in first chamber and second chamber；Described
Separated by second seal between the other end in the other end in one chamber and second chamber, wherein described first seal is also institute
State the center of rotation of eccentric hoop.
Preferably, throttling channel of the first segment head piece for strip, the throttling channel are divided into first end by the eccentric hoop
Mouth and second port, the first port connect first chamber, and the second port connects the import in second chamber.
Preferably, the first port is relative with the second port, when the orifice size of the first port increases,
The orifice size of the second port reduces.
Preferably, second restriction is throttle orifice.
Preferably, second restriction connects the crankcase of engine.
Preferably, when the oil pressure of the outlet oil circuit is more than second pressure threshold value, the oil pressure range in second chamber
60KPa is arrived for 0.
Displacement-variable oil pump according to the present invention not using solenoid electric valve in the case of realize low turn in engine
Fast low oil pressure, the high oil pressure of high rotating speed, and hypertonia under low temperature can be avoided.Present configuration is simple, reliable, low cost, while
Oil-saving effect significantly, is applicable to various vehicular engines.
Description of the drawings
Referring to the drawings, the disclosure will be easier to understand.Skilled addressee readily understands that be：This
A little accompanying drawings are intended solely for illustrative purposes, and are not intended to be construed as limiting protection scope of the present invention.In figure：
Fig. 1 is the assembly schematic diagram of displacement-variable oil pump according to the present invention；
Fig. 2 is the internal structure schematic diagram of the pump housing after the pump cover of displacement-variable oil pump according to the present invention is opened；
Fig. 3 is the structural representation of the pump cover of displacement-variable oil pump according to the present invention；
Fig. 4 is the working state figure of displacement-variable oil pump according to the present invention eccentric hoop under speed operation；
Fig. 5 is the working state figure of displacement-variable oil pump according to the present invention eccentric hoop under high-speed working condition.
Specific embodiment
For helping those skilled in the art definitely understand claimed theme, below in conjunction with the accompanying drawings
Describe the specific embodiment of the present invention in detail.
Referring to Fig. 1, it is the assembly schematic diagram of displacement-variable oil pump according to the present invention.The displacement-variable oil pump sets
In the crankcase of engine, including pump cover 13 and the pump housing 14, pump cover 13 is provided with oil-in 15, and the pump housing 14 is provided with oil-out
16th, main oil gallery feedback oil duct 17 and safety valve 6.Oil-in 15 connects import oil circuit, and oil-out 16, main oil gallery feeds back oil duct 17
It is each provided at exporting on oil circuit with safety valve 6.Machine oil is entered from oil-in 15, by lubricating oil pump body, is finally flowed from oil-out 16
Go out.According to needs are arranged, oil pressure on outlet oil circuit can be fed back to control device by main oil gallery feedback oil duct 17, when outlet oil circuit
On oil pressure too high when, also release can be carried out by safety valve 6.Pump cover 13 is closed with the pump housing 14 also by bolt, pump cover 13 with
Hydraulic space is formed between the pump housing 14.
Referring to Fig. 2, it is that the internal structure of the pump housing 14 is shown after the pump cover 13 of displacement-variable oil pump according to the present invention is opened
It is intended to.Lubricating oil pump originally sets a cavity in vivo, sets eccentric hoop 1 in cavity, and the gap between the eccentric hoop 1 and cavity constitutes first
Chamber 2 and the second chamber 3, i.e. the first chamber 2 and the second chamber 3 are each surround along the periphery of eccentric hoop 1.The one end in the first chamber 2 and the second chamber 3
One end between separated by first seal 9；By second seal between the other end in the other end in the first chamber 2 and the second chamber 3
10 separate, and wherein first seal 9 is also the center of rotation of eccentric hoop 1.First seal 9 can be arranged to rotational pin, eccentric
Ring 1 is rotated around rotational pin.For making the feedback cavity that total displacement reduces, the second chamber 3 is the feedback cavity for increasing total displacement in the first chamber 2.
So-called here " discharge capacity " refers to that the input shaft of lubricating oil pump rotates the output oil mass of a circle.So-called " total displacement " refers to certain time
The total oil mass of the output of inner engine oil pump.
Eccentric hoop 1 diametrically extends and is provided with protuberance 8, arranges flexible member between the side of protuberance 8 and the pump housing 14
7, the pressure spring of precompression is preferably provided with, the opposite side of protuberance 8 is in the first chamber 2.Oil pressure in the first chamber 2
After overcoming the precompression of pressure spring, eccentric hoop 1 can be promoted to rotate around rotational pin.
In conjunction with the structural representation of the pump cover 13 of the displacement-variable oil pump according to the present invention shown in Fig. 3, on pump cover 13
It is provided with first segment head piece 4 and the second restriction 5.Preferably, throttling channel of the first segment head piece 4 for strip, the second restriction 5 are company
Connect the throttle orifice of engine crankcase.Throttling channel is the import in the second chamber 3, and throttle orifice is the outlet in the second chamber 3.Second seal
10 are located between protuberance 8 and the pump housing 14, and second seal 10 is preferably sealing strip.After pump cover 13 closes, eccentric hoop 1 turn
Dynamic swing can the relative throttling channel of protuberance 8.Because protuberance 8 has the part that side is the first chamber 2, when this side is through section
During chute, throttling channel is opened.1 point by eccentric hoop of throttling channel is first port 11 and second port 12, after throttling channel is opened, the
Single port 11 connects the first chamber 2, and machine oil enters throttling channel from the first chamber 2, and flows out into the second chamber 3 from second port 12.
As seen from the figure, first port 11 is oppositely arranged with second port 12, in the rotation process of eccentric hoop 1, first port 11
Orifice size be increase, and the orifice size of second port 12 reduce.
Lubricating oil pump body according to the present invention is displacement-variable oil pump, is vane type lubricating oil pump in the present embodiment.Knot
Fig. 2 and Fig. 3 is closed, eccentric hoop 1 embeds rotor 18, and the rotor 18 is connected with the input shaft of engine, is radially set on rotor 18
There are multiple blades 19, in eccentric hoop 1, be divided into multiple closed cavity volumes 20, input shaft rotor driven 18 is rotated, entrance oil duct
Machine oil be inhaled into, be brought into outlet oil circuit after transmission.As eccentric hoop 1 rotates, then between eccentric hoop 1 and rotor 18
Distance changes, thus changes the volume of cavity volume 20, with and change the discharge capacity of lubricating oil pump.In the present embodiment, when
Along as shown in Figure 2 rotationally clockwise, eccentricity reduces eccentric hoop 1, can reduce the discharge capacity of lubricating oil pump.
Hereinafter will be described in detail the operative scenario of this oil pump, in order to be able to more fully understand the present invention design feature,
Operation principle and its advantage.
As shown in figure 4, under general speed operation, throttling channel is closed by eccentric hoop 1, the second chamber 3 by throttle orifice and is sent out
Motivation crankcase is identical, keeps substantially invariable back pressure, is not affected by oil pump import negative pressure.This operation of oil pump state with general
Single-stage variable pump is the same, feeds back oil duct 17 from the pressure of engine main oil gallery by main oil gallery and enters the first chamber 2, promotes eccentric
Ring 1 reduces towards pressure spring, oil pump offset is counterclockwise compressed along figure, and discharge capacity reduces.But as this oil pump is adjusted
There is relatively low variable displacement initial pressure for the design of pressing spring and discharge capacity reduces speed faster, and initializaing variable pressure can be with little
In 300KPa, therefore after oil pressure has exceeded pressure regulation power, only slow rising is raised with rotating speed, oil pump just only provides engine
The oil pressure of needs, without excessive surplus.Because the work discharge capacity of oil pump and pressure all very littles, energy-saving effect is clearly.
As shown in figure 5, when engine is operated in high-speed working condition, due to the motion of eccentric hoop 1, throttling channel is opened, machine
Oil enters the second chamber 3 from the first chamber 2 through throttling channel, then flows out from throttle orifice.The size of throttling channel and throttle orifice is by calculating
Arranged with test meticulously, certain pressure can be produced in the second chamber 3, such as 0 arrives 60kPa, to resist the oil in the first chamber 2
Pressure, so that slow down the speed of oil pump capacity reduction, it is ensured that during high speed, engine has enough oil pressure.Due to throttle orifice very little, this
The flow also very little of part leakage, the energy ezpenditure total on pump affect very little.
When engine is operated in cold start-up operating mode, the operating position of eccentric hoop 1 is close in high-speed working condition with engine, this
When due to engine oil viscosity very big, oil pressure can compare normal working temperature（Such as 100 degree）Under much higher, safety valve 6 will be opened, and will be many
Remaining machine oil is directly vented, it is ensured that engine health.
The displacement-variable oil pump of the present invention is elaborated in the way of enumerating some specific embodiments above, and this is a few
Example is only used for the principle and embodiments thereof of the explanation present invention, rather than limitation of the present invention, in the essence without departing from the present invention
In the case of god and scope, one of ordinary skill in the art can also make various modifications and improvement, such as feed back main oil gallery
Exit feedback is changed to, these and other all equivalent technical solutions all should belong to scope of the invention the items for the present invention
Claim is limited.
Claims (11)
1. a kind of displacement-variable oil pump, is characterized in that including：
Lubricating oil pump body, the lubricating oil pump body include：
Eccentric hoop（1）；
The first separate chamber（2）With the second chamber（3）, first chamber（2）Outlet oil communication with lubricating oil pump；And
First segment head piece（4）With the second restriction（5）, the first segment head piece（4）With second chamber（3）Import connection,
Second restriction（5）With second chamber（3）Outlet connection；
Wherein when the oil pressure of the outlet oil circuit is more than first pressure threshold value, first chamber（2）Interior oil pressure can force institute
State eccentric hoop（1）Promote towards the direction for reducing machine oil pumpage；When the oil pressure of the outlet oil circuit continues to rise to more than the
During two pressure thresholds, the first segment head piece（4）It is opened, first chamber（2）By the first segment head piece（4）With described
Second chamber（3）Connection, and in second chamber（3）Interior foundation resists the eccentric hoop（1）The oil pressure of promotion, wherein described
One restriction（4）For the throttling channel of strip, the throttling channel is by the eccentric hoop（1）It is divided into first port（11）And second port
（12）, the first port（11）Connect first chamber（2）, the second port（12）Connect second chamber（3）Enter
Mouthful.
2. displacement-variable oil pump according to claim 1, is characterized in that：The lubricating oil pump body is also included located at described
Safety valve on outlet oil circuit（6）, when the oil pressure of the outlet oil circuit is finally risen to more than three pressure thresholds, the safety
Valve（6）Open.
3. displacement-variable oil pump according to claim 1, is characterized in that：The eccentric hoop（1）It is provided with flexible member
（7）, the flexible member（7）There is the initializaing variable pressure of the corresponding first pressure threshold value.
4. displacement-variable oil pump according to claim 3, is characterized in that：The initializaing variable pressure is less than 300KPa.
5. displacement-variable oil pump according to claim 3, is characterized in that：The eccentric hoop（1）Diametrically extend and set
There is protuberance（8）, the flexible member（7）It is located at the protuberance（8）Side and the lubricating oil pump body between, described prominent
Go out portion（8）Opposite side be in first chamber（2）Interior.
6. displacement-variable oil pump according to claim 1, is characterized in that：First chamber（2）With second chamber（3）
Each along the eccentric hoop（1）Periphery surround.
7. displacement-variable oil pump according to claim 1, is characterized in that：First chamber（2）One end and described
Two chambeies（3）One end between by first seal（9）Separate；First chamber（2）The other end and second chamber（3）Another
By second seal between one end（10）Separate, wherein described first seal（9）It is also the eccentric hoop（1）Rotation in
The heart.
8. displacement-variable oil pump according to claim 1, is characterized in that：The first port（11）With second end
Mouthful（12）Relative, when the first port（11）Orifice size increase when, the second port（12）Orifice size reduce.
9. displacement-variable oil pump according to claim 1, is characterized in that：Second restriction（5）For throttle orifice.
10. displacement-variable oil pump according to claim 1, is characterized in that：Second restriction（5）Connection engine
Crankcase.
11. displacement-variable oil pumps according to claim 1, is characterized in that：When the oil pressure of the outlet oil circuit is more than the
During two pressure thresholds, second chamber（3）Interior oil pressure range is 0 to 60KPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310117004.3A CN104100825B (en) | 2013-04-07 | 2013-04-07 | Displacement-variable oil pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310117004.3A CN104100825B (en) | 2013-04-07 | 2013-04-07 | Displacement-variable oil pump |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104100825A CN104100825A (en) | 2014-10-15 |
| CN104100825B true CN104100825B (en) | 2017-03-15 |
Family
ID=51669222
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310117004.3A Active CN104100825B (en) | 2013-04-07 | 2013-04-07 | Displacement-variable oil pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104100825B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108343832A (en) * | 2017-01-23 | 2018-07-31 | 长城汽车股份有限公司 | Displacement-variable oil pump and its application method |
| CN106969249A (en) * | 2017-04-26 | 2017-07-21 | 奇瑞汽车股份有限公司 | A kind of vane type lubricating oil pump |
| CN107327689A (en) * | 2017-08-17 | 2017-11-07 | 湖南机油泵股份有限公司 | A kind of duplex lubricating oil pump of variable displacement |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1403711A (en) * | 2001-08-31 | 2003-03-19 | 尤尼西亚Jkc控制系统株式会社 | Variable desplacement pump |
| CN101010513A (en) * | 2004-05-07 | 2007-08-01 | 特斯玛国际公司 | Vane pump using line pressure to directly regulate displacement |
| CN102146916A (en) * | 2010-02-09 | 2011-08-10 | 日立汽车系统株式会社 | Variable displacement pump, oil jet and lublicating system using variable displacement pump |
| CN101566151B (en) * | 2008-04-23 | 2011-08-17 | 萱场工业株式会社 | Variable displacement vane pump |
| CN102410214A (en) * | 2011-11-03 | 2012-04-11 | 湖南机油泵股份有限公司 | Middle-section variable high-speed pressure limiting three-section pressure feedback variable-displacement vane pump and variable-displacement method |
| CN102906426A (en) * | 2010-05-28 | 2013-01-30 | 皮尔伯格泵技术有限责任公司 | Variable displacement lubricant pump |
-
2013
- 2013-04-07 CN CN201310117004.3A patent/CN104100825B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1403711A (en) * | 2001-08-31 | 2003-03-19 | 尤尼西亚Jkc控制系统株式会社 | Variable desplacement pump |
| CN101010513A (en) * | 2004-05-07 | 2007-08-01 | 特斯玛国际公司 | Vane pump using line pressure to directly regulate displacement |
| CN101566151B (en) * | 2008-04-23 | 2011-08-17 | 萱场工业株式会社 | Variable displacement vane pump |
| CN102146916A (en) * | 2010-02-09 | 2011-08-10 | 日立汽车系统株式会社 | Variable displacement pump, oil jet and lublicating system using variable displacement pump |
| CN102906426A (en) * | 2010-05-28 | 2013-01-30 | 皮尔伯格泵技术有限责任公司 | Variable displacement lubricant pump |
| CN102410214A (en) * | 2011-11-03 | 2012-04-11 | 湖南机油泵股份有限公司 | Middle-section variable high-speed pressure limiting three-section pressure feedback variable-displacement vane pump and variable-displacement method |
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| CN104100825A (en) | 2014-10-15 |
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