EP2926008A1 - Variable displacement lubricant vane pump - Google Patents
Variable displacement lubricant vane pumpInfo
- Publication number
- EP2926008A1 EP2926008A1 EP13796066.2A EP13796066A EP2926008A1 EP 2926008 A1 EP2926008 A1 EP 2926008A1 EP 13796066 A EP13796066 A EP 13796066A EP 2926008 A1 EP2926008 A1 EP 2926008A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- control ring
- pump
- rotor
- variable displacement
- vane pump
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000000314 lubricant Substances 0.000 title claims abstract description 30
- 238000006073 displacement reaction Methods 0.000 title claims abstract description 17
- 239000000463 material Substances 0.000 claims abstract description 36
- 239000004033 plastic Substances 0.000 claims abstract description 22
- 229920003023 plastic Polymers 0.000 claims abstract description 22
- 229910052751 metal Inorganic materials 0.000 claims abstract description 14
- 239000002184 metal Substances 0.000 claims abstract description 14
- 229920002430 Fibre-reinforced plastic Polymers 0.000 claims description 9
- 239000011151 fibre-reinforced plastic Substances 0.000 claims description 9
- 239000004411 aluminium Substances 0.000 claims description 7
- 229910052782 aluminium Inorganic materials 0.000 claims description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 7
- 208000033641 Ring chromosome 5 syndrome Diseases 0.000 claims 1
- 238000005086 pumping Methods 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 238000002485 combustion reaction Methods 0.000 description 3
- 230000001419 dependent effect Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000036316 preload Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2/00—Rotary-piston machines or pumps
- F04C2/30—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
- F04C2/34—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members
- F04C2/344—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member
- F04C2/348—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member the vanes positively engaging, with circumferential play, an outer rotatable member
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C14/00—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
- F04C14/18—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber
- F04C14/22—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber by changing the eccentricity between cooperating members
- F04C14/223—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber by changing the eccentricity between cooperating members using a movable cam
-
- 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
- F04C2210/00—Fluid
- F04C2210/20—Fluid liquid, i.e. incompressible
- F04C2210/206—Oil
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
- F05C2201/00—Metals
- F05C2201/02—Light metals
- F05C2201/021—Aluminium
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
- F05C2225/00—Synthetic polymers, e.g. plastics; Rubber
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
- F05C2251/00—Material properties
- F05C2251/04—Thermal properties
- F05C2251/042—Expansivity
- F05C2251/046—Expansivity dissimilar
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
- F05C2253/00—Other material characteristics; Treatment of material
- F05C2253/04—Composite, e.g. fibre-reinforced
Definitions
- the present invention refers to a mechanical variable displacement lubricant vane pump for providing pressurized lubricant for an internal combustion engine.
- the mechanical lubricant pump is directly driven by the engine and comprises a pump rotor rotating around a rotor axis.
- the pump rotor is provided with a rotor body with radial vane slits wherein numerous shiftable rotor vanes are provided.
- a shiftable control ring is provided which radially surrounds the pumping cavity which is separated by the vanes into numerous rotating pumping chambers. The control ring is actuated so that the control ring can be shifted in a radial direction to control the eccentricity of the control ring with respect to the rotor axis. By controlling the control ring eccentricity the volumetric performance of the pump can be varied without changing the rotational speed of the pump.
- a pump housing is provided including two parallel sidewalls which are axially covering the rotor body, the rotor vanes and the control ring.
- the hydraulic efficiency of the pump is highly dependent on the hydraulic leakage of the pumping chambers which is dependent on the axial clearances between the static housing sidewalls of the pump housing on one side and the rotor body, the vanes and the control ring at the other side.
- Mechanical lubricant pumps of the state of the art use aluminium for the pump housing and steel or sintered steel for the control ring, the vanes and the rotor body. Since the thermal expansion coefficient of the these materials are different, the axial clearances between the housing at one side and the control ring, the vanes and the rotor body on the other side increase up to 100 ⁇ and more at typical lubricant working temperatures of combustion engines of 100°C and more. These clearances lead to serious hydraulic leakage and backflow which cause a reduced hydraulic efficiency of the pump. Additionally, very tight and precise mechanical clearances are to be realized in production of the mechanical lubricant pump which causes relatively high production cost.
- the control ring body is made out of a plastic material, whereby the complete pump housing is made out of steel or metal, and preferably is made of aluminium.
- the thermal expansion coefficient ap of the control ring plastic material is between 65% and 150% of the thermal expansion coefficient a M of the housing metal, steel or aluminium.
- the difference of the thermal expansion coefficients of the control ring material and the pump housing material is significant lower than the thermal expansion difference between steel and aluminium or can even be close to zero so that the increase/decrease of the axial clearance between the pump housing and the control ring caused by a temperature increase/increase is much lower than in the state of the art material pairings, or can even be close to zero.
- the axial clearance between the sidewalls of the pump housing at one side and the control ring at the other side is reduced significantly, especially at common lubricant working temperatures of, in practice, 100°C and more.
- the axial clearance at a working temperatures of around 5 100°C can be reduced to, for example, less than 100 pm so that the hydraulic efficiency of the pump can be increased significantly especially at lubricant working temperature.
- the mechanical clearances to be realized in the production of the pump could be higher so that the production cost can be reduced significantly.
- control ring body is made out of plastic material, the control ring is, in contrast to a metal control ring, relatively light. Therefore, the mass inertia is reduced which, as a consequence, leads to an improved pressure control quality.
- control ring is provided with a separate sliding ring at the inner circumferential of the control ring body, whereby the sliding ring material is different of the control ring body material.
- the control ring body material can be selected to provide a low thermal expansion coefficient difference with the metal pump housing material.
- the sliding ring material is chosen to provide good mechanical properties to provide good lubricational and frictional conditions.
- the sliding ring material could be plastic with a low friction coefficient with respect to the material of the vane head.
- the sliding ring material is metal which provides a low-friction pairing with the vane heads and provides high wear resistance.
- the axial extension of the sliding ring can be different, and preferably can be less than the axial extension of the control ring body which guarantees a small clearance between the control ring body and the pump housing.
- the sliding ring can be rotationally fixed to the control ring or body, for example by overmolding, press-fitting, clamping etc.
- the sliding ring is provided with a radial distance to the control ring body so that the sliding ring is rota table around the center of the control ring so that the sliding ring can rotate together with the pump rotor vanes.
- the shiftable rotor vanes are made of plastic, preferably of the same plastic as the control ring body.
- the vane plastic is chosen to provide a relatively low difference between the thermal expansion coefficient of the vane material and the thermal expansion coefficient of the housing metal. This constitution allows a relatively small axial clearance between the vanes and the pump housing so that the hydraulic efficiency of the pump is improved due to a reduced backflow between the rotating pump chambers defined by the control ring, the pump housing, the pump rotor and the rotor vanes.
- the rotor body is made out a same plastic material, and preferably made out of the same plastic material as the control ring and the vanes.
- the rotor body supports the rotor vanes and, if given, a support ring which axially supports the inner radial end of the vanes.
- the axial clearance of the rotor body with respect to the sidewalls of the pump housing has a relevant impact on the backflow and on the hydraulic pump efficiency. Using the same plastic materia! for the rotor body therefore also increases the hydraulic efficiency of the pump and can help to reduce production costs.
- the plastic material of the control ring, the vanes and, if given, the rotor body is fiber-reinforced plastic material.
- a fiber-reinforced plastic material has good mechanical characteristics, has low weight and provides a good long term mechanical stability.
- the plastic material's thermal expansion coefficient a P is between 100% and 65% of the thermal expansion coefficient a M or the housing metal. This is in particular advantageous in connection with fiber- reinforced plastic material for the control ring.
- a plastic material with a thermal expansion coefficient a P being below 100% of the thermal expansion coefficient of the housing metal provides high safety against jamming of the control ring in the housing. If the control ring is easily shiftable at room temperature which is the normal temperature when the pump is assembled, then there is no danger of jamming of the control ring inside the housing because the clearance is increased at working temperature above 100°C.
- control ring is provided with a radial inlet opening and/or a radial outlet opening, whereby the axial extension of the opening is larger than 3mm.
- the choice of plastic as the basic material for the control ring allows to provide a free design of an inlet opening for filling the lubricant into the rotating pumping chambers and/or of an outlet opening for discharging the lubricant.
- the inlet opening and/or the outlet opening can be formed by injection molding of the control ring. Therefore the inlet opening and/or the outlet opening can be produced very costive-effective.
- figure 1 shows a cross section in a transversal plane I-I of a variable displacement lubricant pump
- figure 2 shows a longitudinal cross-section in a complex longitudinal plane II-II of the pump of figure 1
- figure 3 shows a second embodiment of a control ring of the variable displacement lubricant pump of figure 1
- figure 4 shows a cross section in a transversal plane of a second embodiment of a variable displacement lubricant pump with a control ring being provided with an inlet opening and an outlet opening, and figure 5 shows the control ring of the pump shown in figure 4.
- FIGS 1, 2 and 4 show a variable mechanical displacement lubricant vane pump 10 which is directly driven by an internal combustion engine 50 so that the rotational speed of the pump 10 is always proportional to the rotational speed of the engine 50.
- the pump 10 comprises a pump housing 12 consisting of a housing body 14 and a housing cover lid 15. All parts of the pump housing 12 including the housing body 14 and the housing cover lid 15 are made out of aluminium.
- a rotor 20 is arranged inside the housing 12.
- the rotor 20 consists of a metal rotor shaft 22, a ringlike rotor body 24 holding numerous rotor vanes 26, a circular base disk 27 and a shiftable support ring 28.
- the ringlike rotor body 24 and the base disc 27 are integral with each other and are made of a fiber-reinforced plastic material.
- the rotor 20 rotates around a rotor axis 21.
- the rotor body 24 is provided with numerous radial slits 25 in which the rotor vanes 26 are provided radially shiftable with respect to the rotor body 24.
- the vanes 26 are made of the same fiber- reinforced plastic material as the rotor body 24.
- the pump rotor 20 including the vanes 26 is radially surrounded by a shiftable control ring 30 which is not rota table but is radially shiftable with respect to the pump housing 12.
- the control ring 30 is defined by a single monolithic control ring body 31 which is made of the same fiber-reinforced plastic materia! as the rotor body 24.
- the pump housing 12 provides two parallel sidewalls 16, 17 which axially close and cover the pump cavity defined by the rotor body 24 and the control ring 30.
- the rotor body 24, the rotor vanes 26 and the control ring 30 together define numerous rotating pumping chambers which are rotating in anti-clockwise direction in figure 1.
- One sidewall 17 is provided with an axial inlet opening 18 and with an axial outlet opening 19 through which the lubricant flows into the rotating pumping chambers and flows out of the rotating pumping chambers, respectively.
- a control chamber 40 is hydraulically connected to the outlet opening 19 and pushes the control ring 30 via a control ring plunger 32 against the spring force of a counter-acting preload spring 34 into a low pumping volume position/direction of the pump.
- the thermal expansion coefficient a P of the fiber-reinforced plastic material of the rotor body 24, the vanes 26 and the control ring 30 is very close to or even almost identical with the thermal expansion coefficient aM of the aluminium of the pump housing 12.
- the axial control ring clearances Q. between the control ring 30 and the respective sidewalls 16, 17, the axial vane clearances C 2 between the vanes 26 and the respective sidewalls 16, 17 and the axial rotor body clearances C 3 between the rotor body 24 and the sidewalls 16, 17 is not changing significantly over a temperature range between -30°C and up to 140°C. Even at a temperature of 100°C the clearances CI to C3 remain below 100 pm.
- control ring 30' is defined by a control ring body 31' made out of a fiber reinforced plastic material and a separate metal sliding ring 29.
- the sliding ring 29 is rotationally fixed to the control ring body 31' by overmolding, press-fitting or clamping.
- the sliding ring 29 could also be provided rotatable with respect to the control ring body 31'.
- Figure 4 shows another embodiment of a lubricant pump 10 with a third embodiment of a control ring 30".
- the control ring 30" is provided with an window-like radial inlet opening 50 and a window-like radial outlet opening 52.
- the axial extension of the openings 50, 52 is larger than 3 mm and is preferably larger than 1/3 of the axial width of the control ring body 31".
- the radial inlet opening 50 and the radial outlet opening 52 provide a large total inlet opening area so that a low flow resistance through the openings 50, 52 is provided even at high rotational speed of the pump rotor 20.
- the opening angle of the slit-like radial inlet opening 50 and the radial outlet opening 52 depends on the number of vanes 26 which corresponds with the chamber angle defined by two neighbour-veins 26. In the present example, the opening angle can be between 130° and 70°.
- the radial outlet opening 52 and radial inlet opening 50 can be provided in addition to the axial inlet opening 18 and the axial outlet opening 19 or can be provided as the only inlet and outlet openings.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Rotary Pumps (AREA)
- Details And Applications Of Rotary Liquid Pumps (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP13796066.2A EP2926008B1 (en) | 2012-11-27 | 2013-11-27 | Variable displacement lubricant vane pump |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP12194435.9A EP2735740B1 (en) | 2012-11-27 | 2012-11-27 | Variable displacement lubricant vane pump |
PCT/EP2013/074868 WO2014083063A1 (en) | 2012-11-27 | 2013-11-27 | Variable displacement lubricant vane pump |
EP13796066.2A EP2926008B1 (en) | 2012-11-27 | 2013-11-27 | Variable displacement lubricant vane pump |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2926008A1 true EP2926008A1 (en) | 2015-10-07 |
EP2926008B1 EP2926008B1 (en) | 2019-03-27 |
Family
ID=47471506
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP12194435.9A Active EP2735740B1 (en) | 2012-11-27 | 2012-11-27 | Variable displacement lubricant vane pump |
EP13796066.2A Active EP2926008B1 (en) | 2012-11-27 | 2013-11-27 | Variable displacement lubricant vane pump |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP12194435.9A Active EP2735740B1 (en) | 2012-11-27 | 2012-11-27 | Variable displacement lubricant vane pump |
Country Status (2)
Country | Link |
---|---|
EP (2) | EP2735740B1 (en) |
WO (1) | WO2014083063A1 (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102014203193B4 (en) * | 2014-02-21 | 2019-10-31 | Joma-Polytec Gmbh | Adjustable vane pump |
DE102014102643A1 (en) * | 2014-02-27 | 2015-08-27 | Schwäbische Hüttenwerke Automotive GmbH | Rotary pump with plastic composite structure |
WO2017112499A1 (en) * | 2015-12-23 | 2017-06-29 | Sabic Global Technologies B.V. | Hybrid metal-plastic parts and process for manufacturing the same |
WO2019114949A1 (en) * | 2017-12-13 | 2019-06-20 | Pierburg Pump Technology Gmbh | Variable lubricant vane pump |
EP3973187B1 (en) | 2019-05-23 | 2023-03-15 | Pierburg Pump Technology GmbH | Variable displacement lubricant pump |
EP3976967B1 (en) * | 2019-05-29 | 2023-04-12 | Pierburg Pump Technology GmbH | Variable displacement lubricant pump |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3333647C2 (en) * | 1982-09-21 | 1986-10-30 | Glyco-Antriebstechnik Gmbh, 6200 Wiesbaden | Lubricant pump for generating pressure in an internal combustion engine lubricated by pressure circulation |
US5876192A (en) * | 1996-11-08 | 1999-03-02 | Ford Global Technologies, Inc. | Differential expansion control assembly for a pump |
US7108493B2 (en) * | 2002-03-27 | 2006-09-19 | Argo-Tech Corporation | Variable displacement pump having rotating cam ring |
CN103541894B (en) * | 2008-04-25 | 2015-12-23 | 麦格纳动力系有限公司 | There is the variable displacement vane pump of the exhaust port of enhancing |
DE102011014591B4 (en) * | 2011-03-21 | 2015-12-31 | Volkswagen Ag | Vane pump with pump control ring |
-
2012
- 2012-11-27 EP EP12194435.9A patent/EP2735740B1/en active Active
-
2013
- 2013-11-27 WO PCT/EP2013/074868 patent/WO2014083063A1/en active Application Filing
- 2013-11-27 EP EP13796066.2A patent/EP2926008B1/en active Active
Non-Patent Citations (1)
Title |
---|
See references of WO2014083063A1 * |
Also Published As
Publication number | Publication date |
---|---|
EP2735740A1 (en) | 2014-05-28 |
WO2014083063A1 (en) | 2014-06-05 |
EP2735740B1 (en) | 2018-01-24 |
EP2926008B1 (en) | 2019-03-27 |
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