EP3973186A1 - Variable displacement lubricant pump - Google Patents

Variable displacement lubricant pump

Info

Publication number
EP3973186A1
EP3973186A1 EP19727601.7A EP19727601A EP3973186A1 EP 3973186 A1 EP3973186 A1 EP 3973186A1 EP 19727601 A EP19727601 A EP 19727601A EP 3973186 A1 EP3973186 A1 EP 3973186A1
Authority
EP
European Patent Office
Prior art keywords
control ring
pump
chamber
pumping chamber
slide
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.)
Withdrawn
Application number
EP19727601.7A
Other languages
German (de)
French (fr)
Inventor
Massimiliano Lazzerini
Carmine Cuneo
Fabio GUGLIELMO
Fabio FALOMI
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pierburg Pump Technology GmbH
Original Assignee
Pierburg Pump Technology GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Pierburg Pump Technology GmbH filed Critical Pierburg Pump Technology GmbH
Publication of EP3973186A1 publication Critical patent/EP3973186A1/en
Withdrawn legal-status Critical Current

Links

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
    • 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
    • F04C14/226—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 by pivoting the cam around an eccentric axis
    • 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
    • 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
    • F04C14/10—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by changing the positions of the inlet or outlet openings with respect to the working chamber
    • 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
    • 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
    • F04C2/3441—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 inner and outer member being in contact along one line or continuous surface substantially parallel to the axis of rotation
    • F04C2/3442—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 inner and outer member being in contact along one line or continuous surface substantially parallel to the axis of rotation the surfaces of the inner and outer member, forming the working space, being surfaces of revolution
    • 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
    • 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
    • F04C2210/14—Lubricant
    • 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
    • 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
    • F04C2240/00—Components
    • F04C2240/30—Casings or housings

Definitions

  • the invention is directed to a variable displacement lubricant pump for providing pressurized lubricant, in particular to a mechanical variable displacement lubricant pump for providing pressurized lubricant for an internal combustion engine.
  • the lubricant pump is mechanically driven by the engine, for example via a gear or belt, and is fluidically coupled to the engine for pumping the pressurized lubricant to and through the engine.
  • the variable displacement of the lubricant pump allows controlling and/or stabilizing a pump discharge pressure of the lubricant pump and thereby allows, for example, controlling and/or stabilizing a lubricant gallery pressure in the engine.
  • WO 2018/196991 A1 discloses a typical variable displacement lubricant pump for providing pressurized lubricant for an internal combustion engine.
  • the lubricant pump is provided with a static pump housing and is provided with a shiftable control ring arranged within the pump housing and radially confining a substantially cylindrical pumping chamber.
  • the lubricant pump comprises an outlet chamber which is partially confined by a radial outside of the control ring.
  • the lubricant pump is provided with a rotatable pump rotor which is arranged within the pumping chamber and which is provided with several rotor vanes defining several pumping chamber compartments. The rotor vanes and, as a result, the pumping chamber compartments rotate within the shiftable control ring.
  • the lubricant pump comprises a pumping chamber pressure section being defined by those pumping chamber compartments which are fluidically connected with the outlet chamber via a discharge opening.
  • the lubricant pump comprises a slide bearing which adjoins the outlet chamber and which shiftably supports the control ring within the pump housing.
  • the slide bearing comprises a first slide bearing surface which is defined by the pump housing and which extends in a slide plane, and comprises a second slide bearing surface which is defined by the control ring.
  • the control ring is pushed away from the outlet chamber and towards the pump inlet if the outlet chamber is filled with pressurized lubricant.
  • the second bearing surface being defined by the control ring is moved away from the first bearing surface being defined by the pump housing so that a significant bearing gap is formed.
  • This bearing gap can provide a leakage path for lubricant, for example from the outlet chamber into a control chamber being located at an opposite side of the slide bearing.
  • the undesired lubricant leakage into the control chamber can adversely affect the control of the control ring position and, as a result, can impair the pump discharge pressure control and/or the pump performance.
  • the first slide bearing is provided with a seal element to avoid a lubricant leakage via the bearing gap.
  • the seal element increases the slide friction of the friction bearing and, as a result, reduces the pump efficiency.
  • the pump housing and/or the control ring have to be provided with specific holding means to hold the seal element in place and to avoid a slipping of the seal element out of the bearing gap.
  • variable displacement lubricant pump It is an object of the invention to provide a cost-efficient, reliable and efficient variable displacement lubricant pump. This object is achieved with a variable displacement lubricant pump with the features of claim 1.
  • variable displacement lubricant pump is provided with a static pump housing which defines a pump inlet and a pump outlet.
  • the pump inlet is typically fluidically connected with a lubricant tank, and the pump outlet is fluidically connected with an engine for providing the engine with pressurized lubricant.
  • the variable displacement lubricant pump according to the invention is also provided with a shiftable control ring which is arranged within the pump housing and which radially confines a substantially cylindrical pumping chamber.
  • the control ring is preferably linearly shiftable with respect to the pump housing. In any case the control ring is not pivotably hinged within the pump housing.
  • the pumping chamber is typically provided with an exactly circular radial cross section. However, the pumping chamber can also be provided with a non-exactly circular radial cross section - for example with a slightly elliptical cross section - to improve the pump efficiency and/or the pump pressure control.
  • variable displacement lubricant pump according to the invention is also provided with an outlet chamber which is fluidically connected with the pump outlet.
  • the outlet chamber is located directly adjoining to the control ring and is partially confined by a radial outside of the control ring.
  • the outlet chamber is filled with pressurized lubricant during pump operation.
  • An interface between the outlet chamber and the control ring - i.e. the part of the radial outside surface of the control ring which is in direct fluidic contact with the outlet chamber - defines an outside pressure surface of the control ring.
  • the variable displacement lubricant pump according to the invention is also provided with a rotatable pump rotor which is arranged within the control ring and, in particular, is arranged within the pumping chamber.
  • the pump rotor comprises several rotor vanes defining several pumping chamber compartments.
  • the rotor vanes and, as a result, the pumping chamber compartments rotate within the control ring and thereby pump the lubricant from an inlet chamber into the outlet chamber.
  • the pump rotor is mechanically driven by the engine for example via a belt drive or a gearing.
  • the pump rotor axis of rotation is static so that shifting the control ring changes the eccentricity of the pump rotor with respect to the surrounding control ring to thereby control the displacement and, as a result, the volumetric performance of the pump.
  • variable displacement lubricant pump is also provided a pumping chamber pressure section being defined by those pumping chamber compartments which are located adjoining to a discharge opening of the control ring and, as a result, are fluidically connected with the outlet chamber via the discharge opening.
  • the pumping chamber pressure section is filled with pressurized lubricant.
  • the extent of the pumping chamber pressure section varies between a minimum and a maximum extent during pump operation.
  • An interface between the pumping chamber pressure section and the control ring - i.e. the part of the radial inside surface of the control ring which is in direct fluidic contact with the pumping chamber pressure section - defines an inside pressure surface of the control ring.
  • variable displacement lubricant pump is also provided with at least one slide bearing which is located adjoining to the outlet chamber and by which the control ring is shiftably supported within the pump housing.
  • the slide bearing comprises a first slide bearing surface and a corresponding second slide bearing surface.
  • the first slide bearing surface is defined by the pump housing and extents in a slide plane.
  • the second slide bearing surface is defined by the control ring and is provided opposite and parallel to the first slide bearing surface.
  • the outlet chamber and the pressure region of the pumping chamber are both filled with pressurized lubricant so that the inside pressure surface as well as the outside pressure surface of the control ring are loaded with the same hydraulic pressure, in particular with the hydraulic pressure of the pressurized lubricant.
  • the strength and in particular the direction of a total hydraulic load force - generated by the lubricant pressure and affecting the control - is only determined by the geometry of the pressure surfaces.
  • a strength and a direction of an effective load force fraction being effective perpendicular to the slide plane is defined by the ratio of projection areas being defined by the orthographic projection of the pressure surfaces onto the slide plane.
  • control ring and the pump housing are designed in that way that an outside projection area defined by the orthographic projection of the outside pressure surface onto the slide plane is smaller compared to a maximum inside projection area defined by the orthographic projection of the inside pressure surface onto the slide plane.
  • variable displacement lubricant pump according to the invention provides a reliable and efficient control of the control ring position and, as a result, of the volumetric pump performance. Since no sealing element is required within the slide bearing, the variable displacement lubricant pump according to the invention can be realized very cost- efficiently.
  • the projection area of the outside pressure surface onto the slide plane is smaller compared to a minimum projection area of the inside pressure surface onto the slide plane.
  • the effective load force which presses together the slide bearing surface is generated independently of the rotational position of the motor rotor. This minimizes the bearing gap and, as a result, provides a very efficient and reliable lubricant pump.
  • the outside pressure surface is arranged completely at an outlet-sided lateral side of a pumping chamber centerline extending parallel to the slide plane. More preferably, the outside pressure surface is arranged within an angular range of 45° to 135° with respect to a pumping chamber center and starting at the pumping chamber centerline.
  • a control chamber is provided for hydraulically controlling the control ring position.
  • the control chamber is typically provided at a front side of the control ring and circumferentially adjacent to the outlet chamber.
  • the control chamber is provided with an interface with the control ring which extends substantially perpendicular to the slide plan so that the hydraulic pressure within the control chamber loads the control ring in a direction being parallel to the slide plane.
  • the control chamber surrounds a large circumferential section of the control ring and, in particular, extends to the slide bearing so that the control chamber is fluidically separated from the outlet chamber only by the slide bearing.
  • the control chamber is provided with a relatively large interface with the control ring which allows generating a relatively high hydraulic actuation force with a relatively low hydraulic control chamber pressure.
  • figure 1 shows a partially sectioned view of a variable displacement lubricant pump according to the invention
  • figure 2 shows a magnification of a part of the lubricant pump of figure 1
  • figure 3 shows a schematic illustration of orthographic projection areas of control ring pressure surfaces onto a slide plane of the lubricant pump of figure 1.
  • Figures 1 and 2 show a variable displacement lubricant pump 10 for providing pressurized lubricant to an internal combustion engine 12.
  • the lubricant pump 10 is provided with a static pump housing 14, with a shiftable control ring 16 and with a rotatable pump rotor 18.
  • the control ring 16 is arranged within the pump housing 14 and radially confines a substantially cylindrical pumping chamber 20.
  • the lubricant pump 10 comprises an inlet chamber 22 being fluidically connected with a lubricant tank 24 and being filled with lubricant with substantially atmospheric pressure during pump operation.
  • the inlet chamber 22 is fluidically connected with the pumping chamber 20 by a suction opening 26 of the control ring 16.
  • the lubricant pump 10 comprises an outlet chamber 28 being fluidically connected with the engine 12 and being filled with pressurized lubricant during pump operation.
  • the outlet chamber 28 is located at a lateral side of the pumping chamber 20 and substantially opposite with respect to the inlet chamber 22.
  • the outlet chamber 28 is partially confined by a radial outside of the control ring 16, wherein an interface between the outlet chamber 28 and the control ring 16 defines an outside pressure surface 30 of the control ring.
  • the pressure surface 30 is completely located at an outlet-sided lateral side of the pumping chamber 20.
  • the outside pressure surface 30 is located within a circle sector S which extends over an angular range of 45° to 135° with respect to a pumping chamber center C and starting at a pumping chamber centerline L which extends parallel to a slide plane P of the control ring 16.
  • the outlet chamber 28 is fluidically connected with the pumping chamber 20 by a discharge opening 31 of the control ring 16.
  • the lubricant pump 10 comprises a control chamber 32 located circumferentially between the inlet chamber 22 and the outlet chamber 28 at a front side of the control ring 16.
  • the control chamber 32 is filled with lubricant.
  • the lubricant pressure within the control chamber 32 is controllable to thereby hydraulically control the position of the control ring 16 and, as a result, the volumetric pump performance.
  • the lubricant pump 10 comprises a slide bearing 42 by which the control ring 16 is shiftably supported within the pump housing 14.
  • the slide bearing 42 is located adjoining to the outlet chamber 28 and to the control chamber 32 and fluidically separates the control chamber 32 and the outlet chamber.
  • the slide bearing 42 comprises two corresponding slide bearings surfaces 44,46 being in touching contact with each other.
  • the first slide bearing surface 44 is defined by the pump housing 14, and the second slide bearing surface 46 is defined by the control ring 16.
  • the first slide bearing surface 44 extends in the slide plane P and the second slide bearing surface 46 is parallel with respect to the first slide bearing surface 44 so that the control ring 16 is shiftable within the pump housing 14 parallel to the slide plane P.
  • the pump rotor 18 is arranged within the pumping chamber 20 and comprises nine rotor vanes 33a-i defining nine pumping chamber compartments 34a-i. During pump operation, the rotor vanes 33a-i and, as a result, the pumping chamber compartments 34a-i rotate within the pumping chamber 20 and thereby pump lubricant from the inlet chamber 22 into the outlet chamber 28.
  • the pump rotor 18 is mechanically driven by the engine 12 - for example via a belt drive or a gearing - so that the pump rotor 18 always rotates with a rotational speed being directly proportional to a rotational speed of the engine 12.
  • Those of the pumping chamber compartments 34a-i which are presently located adjoining to the discharge opening and, as a result, are fluidically connected with the outlet chamber 28 via the discharge opening 31 define a pumping chamber pressure section 36.
  • the pumping chamber pressure section is defined by the pumping chamber compartments 34a-d.
  • An interface between the pumping chamber pressure section 36 and the control ring 16 defines an inside pressure surface 40 of the control ring.
  • the orthographic projection of the outside pressure surface 30 onto the slide plane P defines an outside projection area Al.
  • the orthographic projection of the inside pressure surface 40 onto the slide plane P defines a present inside projection area A2, wherein the extent of the present inside projection area A2 varies between a minimum inside projection area A2-min and a maximum inside projection area A2-max.
  • Figure 3 shows a schematic illustration of the outside projection area A1 and the present inside projection area A2 for the exemplary rotor position shown in figures 1 and 2, as well as of the minimum inside projection area A2-min and the maximum inside projection area A2-max.
  • the pump housing 14 and the control ring 16 are designed in that way that the outside projection area A1 is smaller compared to the maximum inside projection area A2-max.
  • the outside projection area A1 is smaller compared to the minimum inside projection area A2-min.
  • the outlet chamber 28 and the pumping chamber pressure section 36 are both filled with the pressurized lubricant so that the outside pressure surface 30 and the inside pressure surfaces 40 are loaded with the same hydraulic pressure.
  • the control ring 16 Since the outside projection area A1 is smaller than the minimum inside projection area A2-min, the control ring 16 is constantly hydraulically loaded with an effective load force F during pump operation, wherein the effective load force F is effective perpendicular to the slide plane P and towards the outlet chamber 28.
  • the second slide bearing surface 46 of the control ring 16 is constantly pressed against the first slide bearing surface 44 of the pump housing 14 during pump operation so that the gap between the slide bearing surfaces 44,46 is minimized.
  • variable displacement lubricant pump 12 internal combustion engine

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)
  • Rotary Pumps (AREA)

Abstract

The invention is directed to a variable displacement lubricant pump (10) for providing pressurized lubricant, comprising a static pump housing (14), a shiftable control ring (16) arranged within the pump housing (14) and radially confining a substantially cylindrical pumping chamber (20), an outlet chamber (28) partially confined by a radial outside of the control ring (16), and a slide bearing (42) adjoining the outlet chamber (28) and shiftably supporting the control ring (16) within the pump housing (14), wherein the slide bearing (42) comprises a first slide bearing surface (44) defined by the pump housing and extending in a slide plane (P), and a second slide bearing surface (46) defined by the control ring (16). Because an outside projection area (A1) defined by the orthographic projection of an outside pressure surface (30) of the control ring (16) onto the slide plane (P) is smaller compared to a maximum inside projection area (A2-max) defined by the orthographic projection of an inside pressure surface (40) of the control ring (16) onto the slide plane (p), the variable displacement lubricant pump (10) according to the invention can be realized cost-efficiently and provides reliable and efficient pump operation.

Description

D E S C R I P T I O N Variable displacement lubricant pump
The invention is directed to a variable displacement lubricant pump for providing pressurized lubricant, in particular to a mechanical variable displacement lubricant pump for providing pressurized lubricant for an internal combustion engine.
The lubricant pump is mechanically driven by the engine, for example via a gear or belt, and is fluidically coupled to the engine for pumping the pressurized lubricant to and through the engine. The variable displacement of the lubricant pump allows controlling and/or stabilizing a pump discharge pressure of the lubricant pump and thereby allows, for example, controlling and/or stabilizing a lubricant gallery pressure in the engine.
WO 2018/196991 A1 discloses a typical variable displacement lubricant pump for providing pressurized lubricant for an internal combustion engine. The lubricant pump is provided with a static pump housing and is provided with a shiftable control ring arranged within the pump housing and radially confining a substantially cylindrical pumping chamber. The lubricant pump comprises an outlet chamber which is partially confined by a radial outside of the control ring. The lubricant pump is provided with a rotatable pump rotor which is arranged within the pumping chamber and which is provided with several rotor vanes defining several pumping chamber compartments. The rotor vanes and, as a result, the pumping chamber compartments rotate within the shiftable control ring. The lubricant pump comprises a pumping chamber pressure section being defined by those pumping chamber compartments which are fluidically connected with the outlet chamber via a discharge opening. The lubricant pump comprises a slide bearing which adjoins the outlet chamber and which shiftably supports the control ring within the pump housing. The slide bearing comprises a first slide bearing surface which is defined by the pump housing and which extends in a slide plane, and comprises a second slide bearing surface which is defined by the control ring.
Caused by the outlet chamber geometry of the disclosed lubricant pump, the control ring is pushed away from the outlet chamber and towards the pump inlet if the outlet chamber is filled with pressurized lubricant. As a result, the second bearing surface being defined by the control ring is moved away from the first bearing surface being defined by the pump housing so that a significant bearing gap is formed. This bearing gap can provide a leakage path for lubricant, for example from the outlet chamber into a control chamber being located at an opposite side of the slide bearing. The undesired lubricant leakage into the control chamber can adversely affect the control of the control ring position and, as a result, can impair the pump discharge pressure control and/or the pump performance.
Therefore, the first slide bearing is provided with a seal element to avoid a lubricant leakage via the bearing gap. However, the seal element increases the slide friction of the friction bearing and, as a result, reduces the pump efficiency. Furthermore, the pump housing and/or the control ring have to be provided with specific holding means to hold the seal element in place and to avoid a slipping of the seal element out of the bearing gap.
It is an object of the invention to provide a cost-efficient, reliable and efficient variable displacement lubricant pump. This object is achieved with a variable displacement lubricant pump with the features of claim 1.
The variable displacement lubricant pump according to the invention is provided with a static pump housing which defines a pump inlet and a pump outlet. The pump inlet is typically fluidically connected with a lubricant tank, and the pump outlet is fluidically connected with an engine for providing the engine with pressurized lubricant. The variable displacement lubricant pump according to the invention is also provided with a shiftable control ring which is arranged within the pump housing and which radially confines a substantially cylindrical pumping chamber. The control ring is preferably linearly shiftable with respect to the pump housing. In any case the control ring is not pivotably hinged within the pump housing. The pumping chamber is typically provided with an exactly circular radial cross section. However, the pumping chamber can also be provided with a non-exactly circular radial cross section - for example with a slightly elliptical cross section - to improve the pump efficiency and/or the pump pressure control.
The variable displacement lubricant pump according to the invention is also provided with an outlet chamber which is fluidically connected with the pump outlet. The outlet chamber is located directly adjoining to the control ring and is partially confined by a radial outside of the control ring. The outlet chamber is filled with pressurized lubricant during pump operation. An interface between the outlet chamber and the control ring - i.e. the part of the radial outside surface of the control ring which is in direct fluidic contact with the outlet chamber - defines an outside pressure surface of the control ring. The variable displacement lubricant pump according to the invention is also provided with a rotatable pump rotor which is arranged within the control ring and, in particular, is arranged within the pumping chamber. The pump rotor comprises several rotor vanes defining several pumping chamber compartments. The rotor vanes and, as a result, the pumping chamber compartments rotate within the control ring and thereby pump the lubricant from an inlet chamber into the outlet chamber. The pump rotor is mechanically driven by the engine for example via a belt drive or a gearing. The pump rotor axis of rotation is static so that shifting the control ring changes the eccentricity of the pump rotor with respect to the surrounding control ring to thereby control the displacement and, as a result, the volumetric performance of the pump.
The variable displacement lubricant pump according to the invention is also provided a pumping chamber pressure section being defined by those pumping chamber compartments which are located adjoining to a discharge opening of the control ring and, as a result, are fluidically connected with the outlet chamber via the discharge opening. During pump operation, the pumping chamber pressure section is filled with pressurized lubricant. Caused by the rotation of the pumping chamber compartments, the extent of the pumping chamber pressure section varies between a minimum and a maximum extent during pump operation. An interface between the pumping chamber pressure section and the control ring - i.e. the part of the radial inside surface of the control ring which is in direct fluidic contact with the pumping chamber pressure section - defines an inside pressure surface of the control ring.
The variable displacement lubricant pump according to the invention is also provided with at least one slide bearing which is located adjoining to the outlet chamber and by which the control ring is shiftably supported within the pump housing. The slide bearing comprises a first slide bearing surface and a corresponding second slide bearing surface. The first slide bearing surface is defined by the pump housing and extents in a slide plane. The second slide bearing surface is defined by the control ring and is provided opposite and parallel to the first slide bearing surface.
During pump operation, the outlet chamber and the pressure region of the pumping chamber are both filled with pressurized lubricant so that the inside pressure surface as well as the outside pressure surface of the control ring are loaded with the same hydraulic pressure, in particular with the hydraulic pressure of the pressurized lubricant. As a result, the strength and in particular the direction of a total hydraulic load force - generated by the lubricant pressure and affecting the control - is only determined by the geometry of the pressure surfaces. In particular, a strength and a direction of an effective load force fraction being effective perpendicular to the slide plane is defined by the ratio of projection areas being defined by the orthographic projection of the pressure surfaces onto the slide plane.
According to the invention, the control ring and the pump housing are designed in that way that an outside projection area defined by the orthographic projection of the outside pressure surface onto the slide plane is smaller compared to a maximum inside projection area defined by the orthographic projection of the inside pressure surface onto the slide plane. As a result, during pump operation, an effective hydraulic load force is generated which is effective perpendicular to the slide plane and towards the outlet chamber so that the second slide bearing surface of the control ring is pressed against the first slide bearing surface of the pump housing. This reduces a bearing gap between the slide bearing surfaces and, as a result, avoids or at least significantly suppresses a lubricant leakage via the slide bearing without requiring any separate sealing element in the slide bearing. The variable displacement lubricant pump according to the invention provides a reliable and efficient control of the control ring position and, as a result, of the volumetric pump performance. Since no sealing element is required within the slide bearing, the variable displacement lubricant pump according to the invention can be realized very cost- efficiently.
In a preferred embodiment of the invention, the projection area of the outside pressure surface onto the slide plane is smaller compared to a minimum projection area of the inside pressure surface onto the slide plane. As a result, the effective load force which presses together the slide bearing surface is generated independently of the rotational position of the motor rotor. This minimizes the bearing gap and, as a result, provides a very efficient and reliable lubricant pump. Preferably, the outside pressure surface is arranged completely at an outlet-sided lateral side of a pumping chamber centerline extending parallel to the slide plane. More preferably, the outside pressure surface is arranged within an angular range of 45° to 135° with respect to a pumping chamber center and starting at the pumping chamber centerline. As a result, the outside pressure surface generates a hydraulic load force which is effective substantially completely perpendicular to the slide plane and, as a result, does not significantly affect the control of the control ring position. This provides a reliable and efficient lubricant pump. In a preferred embodiment of the invention, a control chamber is provided for hydraulically controlling the control ring position. The control chamber is typically provided at a front side of the control ring and circumferentially adjacent to the outlet chamber. The control chamber is provided with an interface with the control ring which extends substantially perpendicular to the slide plan so that the hydraulic pressure within the control chamber loads the control ring in a direction being parallel to the slide plane. The control chamber surrounds a large circumferential section of the control ring and, in particular, extends to the slide bearing so that the control chamber is fluidically separated from the outlet chamber only by the slide bearing. As a result, the control chamber is provided with a relatively large interface with the control ring which allows generating a relatively high hydraulic actuation force with a relatively low hydraulic control chamber pressure.
An embodiment of the invention is described with reference to the enclosed drawings, wherein
figure 1 shows a partially sectioned view of a variable displacement lubricant pump according to the invention,
figure 2 shows a magnification of a part of the lubricant pump of figure 1, and
figure 3 shows a schematic illustration of orthographic projection areas of control ring pressure surfaces onto a slide plane of the lubricant pump of figure 1.
Figures 1 and 2 show a variable displacement lubricant pump 10 for providing pressurized lubricant to an internal combustion engine 12. The lubricant pump 10 is provided with a static pump housing 14, with a shiftable control ring 16 and with a rotatable pump rotor 18. The control ring 16 is arranged within the pump housing 14 and radially confines a substantially cylindrical pumping chamber 20.
The lubricant pump 10 comprises an inlet chamber 22 being fluidically connected with a lubricant tank 24 and being filled with lubricant with substantially atmospheric pressure during pump operation. The inlet chamber 22 is fluidically connected with the pumping chamber 20 by a suction opening 26 of the control ring 16. The lubricant pump 10 comprises an outlet chamber 28 being fluidically connected with the engine 12 and being filled with pressurized lubricant during pump operation. The outlet chamber 28 is located at a lateral side of the pumping chamber 20 and substantially opposite with respect to the inlet chamber 22. The outlet chamber 28 is partially confined by a radial outside of the control ring 16, wherein an interface between the outlet chamber 28 and the control ring 16 defines an outside pressure surface 30 of the control ring. The pressure surface 30 is completely located at an outlet-sided lateral side of the pumping chamber 20. In particular, the outside pressure surface 30 is located within a circle sector S which extends over an angular range of 45° to 135° with respect to a pumping chamber center C and starting at a pumping chamber centerline L which extends parallel to a slide plane P of the control ring 16. The outlet chamber 28 is fluidically connected with the pumping chamber 20 by a discharge opening 31 of the control ring 16.
The lubricant pump 10 comprises a control chamber 32 located circumferentially between the inlet chamber 22 and the outlet chamber 28 at a front side of the control ring 16. During pump operation, the control chamber 32 is filled with lubricant. The lubricant pressure within the control chamber 32 is controllable to thereby hydraulically control the position of the control ring 16 and, as a result, the volumetric pump performance.
The lubricant pump 10 comprises a slide bearing 42 by which the control ring 16 is shiftably supported within the pump housing 14. The slide bearing 42 is located adjoining to the outlet chamber 28 and to the control chamber 32 and fluidically separates the control chamber 32 and the outlet chamber. The slide bearing 42 comprises two corresponding slide bearings surfaces 44,46 being in touching contact with each other. The first slide bearing surface 44 is defined by the pump housing 14, and the second slide bearing surface 46 is defined by the control ring 16. The first slide bearing surface 44 extends in the slide plane P and the second slide bearing surface 46 is parallel with respect to the first slide bearing surface 44 so that the control ring 16 is shiftable within the pump housing 14 parallel to the slide plane P.
The pump rotor 18 is arranged within the pumping chamber 20 and comprises nine rotor vanes 33a-i defining nine pumping chamber compartments 34a-i. During pump operation, the rotor vanes 33a-i and, as a result, the pumping chamber compartments 34a-i rotate within the pumping chamber 20 and thereby pump lubricant from the inlet chamber 22 into the outlet chamber 28. The pump rotor 18 is mechanically driven by the engine 12 - for example via a belt drive or a gearing - so that the pump rotor 18 always rotates with a rotational speed being directly proportional to a rotational speed of the engine 12.
Those of the pumping chamber compartments 34a-i which are presently located adjoining to the discharge opening and, as a result, are fluidically connected with the outlet chamber 28 via the discharge opening 31 define a pumping chamber pressure section 36. For the exemplary pump rotor position shown in figure 1, the pumping chamber pressure section is defined by the pumping chamber compartments 34a-d. An interface between the pumping chamber pressure section 36 and the control ring 16 defines an inside pressure surface 40 of the control ring. Caused by the rotation of the pump rotor 18 and, as a result, of the pumping chamber compartments 34a-i, the actual circumferential extent of the pumping chamber pressure section 36 and, as a result, of the inside pressure surface 40 varies between a minimum extent El and a maximum extent E2 during pump operation. The orthographic projection of the outside pressure surface 30 onto the slide plane P defines an outside projection area Al. Depending on the present rotational position of the pump rotor 18, the orthographic projection of the inside pressure surface 40 onto the slide plane P defines a present inside projection area A2, wherein the extent of the present inside projection area A2 varies between a minimum inside projection area A2-min and a maximum inside projection area A2-max. Figure 3 shows a schematic illustration of the outside projection area A1 and the present inside projection area A2 for the exemplary rotor position shown in figures 1 and 2, as well as of the minimum inside projection area A2-min and the maximum inside projection area A2-max. According to the invention, the pump housing 14 and the control ring 16 are designed in that way that the outside projection area A1 is smaller compared to the maximum inside projection area A2-max. In the present embodiment of the invention, the outside projection area A1 is smaller compared to the minimum inside projection area A2-min.
During pump operation, the outlet chamber 28 and the pumping chamber pressure section 36 are both filled with the pressurized lubricant so that the outside pressure surface 30 and the inside pressure surfaces 40 are loaded with the same hydraulic pressure. Since the outside projection area A1 is smaller than the minimum inside projection area A2-min, the control ring 16 is constantly hydraulically loaded with an effective load force F during pump operation, wherein the effective load force F is effective perpendicular to the slide plane P and towards the outlet chamber 28. As a result, the second slide bearing surface 46 of the control ring 16 is constantly pressed against the first slide bearing surface 44 of the pump housing 14 during pump operation so that the gap between the slide bearing surfaces 44,46 is minimized. Reference List
10 variable displacement lubricant pump 12 internal combustion engine
14 pump housing
16 control ring
18 pump rotor
20 pumping chamber
22 inlet chamber
24 lubricant tank
26 suction opening
28 outlet chamber
30 outside pressure surface
31 discharge opening
32 control chamber
33a-i rotor vanes
34a-i pumping chamber compartments 36 pumping chamber pressure section 40 inside pressure surface
42 slide bearing
44 first slide bearing surface
46 second slide bearing surface
A1 outside projection area
A2 present inside projection area
A2-min minimum inside projection area A2-max maximum inside projection area C pumping chamber center
El minimum extent
E2 maximum extent
F effective load force
L pumping chamber centerline P slide plane
S circle sector

Claims

C L A I M S
1. A variable displacement lubricant pump (10) for providing pressurized lubricant, comprising
- a static pump housing (14),
- a shiftable control ring (16) arranged within the pump housing (14) and radially confining a substantially cylindrical pumping chamber (20),
- an outlet chamber (28) partially confined by a radial outside of the control ring (16), wherein an interface between the outlet chamber (28) and the control ring (16) defines an outside pressure surface (30) of the control ring (16),
- a rotatable pump rotor (18) arranged within the pumping chamber (20) and provided with several rotor vanes (33a-i), wherein the rotor vanes (33a-i) define several pumping chamber compartments (34a-i),
- a pumping chamber pressure section (36) being defined by those pumping chamber compartments (34a-d) which are directly fluidically connected with the outlet chamber (28) via a discharge opening (31), wherein an interface between the pumping chamber pressure section (36) and the control ring (16) defines an inside pressure surface (40) of the control ring (16), and
- a slide bearing (42) adjoining the outlet chamber (28) and shiftably supporting the control ring (16) within the pump housing (14), wherein the slide bearing (42) comprises
• a first slide bearing surface (44) defined by the pump housing and extending in a slide plane (P), and
• a second slide bearing surface (46) defined by the control ring
(16), - wherein an outside projection area (Al) defined by the orthographic projection of the outside pressure surface (30) onto the slide plane (P) is smaller compared to a maximum inside projection area (A2-max) defined by the orthographic projection of the inside pressure surface (40) onto the slide plane (p).
2. The variable displacement lubricant pump (10) according to claim 1, wherein the outside projection area (Al) is smaller compared to a minimum inside projection area (A2-min) defined by the orthographic projection of the inside pressure surface (40) onto the slide plane (p).
3. The variable displacement lubricant pump (10) according to one of the preceding claims, wherein the outside pressure surface (30) is arranged completely at an outlet-sided lateral side of a pumping chamber centerline (L) extending parallel to the slide plane (P).
4. The variable displacement lubricant pump (10) according to claim 3, wherein the outside pressure surface (30) is arranged within an angular range of 45° to 135° with respect to a pumping chamber center (C) and starting at the pumping chamber centerline (L).
5. The variable displacement lubricant pump (10) according to one of the preceding claims, wherein a control chamber (32) is provided for hydraulically controlling the control ring position, and wherein the slide bearing (42) fluidically separates the outlet chamber (28) and the control chamber (32).
EP19727601.7A 2019-05-23 2019-05-23 Variable displacement lubricant pump Withdrawn EP3973186A1 (en)

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PCT/EP2019/063280 WO2020233812A1 (en) 2019-05-23 2019-05-23 Variable displacement lubricant pump

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EP (1) EP3973186A1 (en)
JP (1) JP2022534048A (en)
CN (1) CN113994095A (en)
WO (1) WO2020233812A1 (en)

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US20220235766A1 (en) 2022-07-28
WO2020233812A1 (en) 2020-11-26
CN113994095A (en) 2022-01-28

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