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
  • F04C2/3441—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
  • F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
  • F01C21/00—Component parts, details or accessories not provided for in groups F01C1/00 - F01C20/00
  • F01C21/10—Outer members for co-operation with rotary pistons; Casings
  • F01C21/104—Stators; Members defining the outer boundaries of the working chamber
  • F01C21/108—Stators; Members defining the outer boundaries of the working chamber with an axial surface, e.g. side plates
• • 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
  • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
  • F04C15/0042—Systems for the equilibration of forces acting on the machines or pump

Definitions

• the invention is directed to a variable displacement lubricant pump, in particular to a variable displacement vane pump for providing pressurized lubricant.
• the rotational speed of the vane pump depends on the rotational speed of the crankshaft and not on the required lubrication performance of the internal combustion engine.
• the total flow rate of the vane pump is generally proportional to its rotational speed.
• the flow rate is relatively low at low rotational speed and increases with higher rotational speed.
• Vane pumps with a variable displacement allow to adapt the pumping flow rate to the requirements of the lubrication system.
• variable displacement vane pump can vary the eccentricity of a radially shiftable control ring enclosing and defining a pumping chamber to thereby adapt the pumping performance independently of the rotational speed of the pump.
• variable displacement lubricant vane pumps are disclosed in WO 2014/141013 Al or in WO 2014/198322 Al.
• a variable displacement lubricant pump comprises a pump housing with a first axial sidewall, a pump housing cover with a second opposite axial sidewall and a rotatable rotor hub rotating around a rotational axis.
• the variable displacement lubricant pump further comprises a non-rotatable and radially shiftable control ring circumferentially enclosing the rotor hub and being arranged with a variable eccentricity with respect to the rotor hub.
• the shifting direction of the control ring defines an eccentricity axis.
• the control ring, the rotor hub, the axial sidewall of the pump housing and the axial sidewall of the pump housing cover define a pumping chamber.
• the pumping chamber comprises a suction zone with a suction opening at the axial sidewall of the pump housing and a discharge zone with a discharge opening at the axial sidewall of the pump housing.
• the suction opening and the discharge opening can alternatively or additionally be provided at the opposite axial sidewall of the pump housing cover. Because of the eccentricity of the control ring, the volumes of the pumping compartments in the suction zone continuously increase in rotational direction and thereby the pressure decreases causing a suction of the lubricant through the suction opening. In the discharge zone, the pumping compartment volumes continuously decrease in rotational direction and thereby the pressure increases causing the discharge of the lubricant through the discharge opening.
• the pumping chamber is functionally separated by the line of apses into the suction zone and the discharge zone.
• the apoapsis defines the maximum distance between the outer cylinder surface of the rotor hub and the inner cylinder surface of the control ring, and the periapsis defines the minimum distance.
• the pumping chamber comprises a neutral zone at the periapsis, which is located in rotational direction behind the discharge opening and before the suction opening.
• the neutral zone is substantially symmetrically arranged to the line of apses at the periapsis of the pumping chamber. This neutral zone is periodically closed by a passing pumping compartment during the rotation of the rotor hub.
• the valve opening At a minimum eccentricity value at high rotational speed, the valve opening is completely uncovered, so that the total valve opening area is open.
• the provided fluidic connection depressurizes the pumping compartment at the periapsis and reduces the internal forces affecting the eccentricity of the control ring.
• the uncovered valve opening area depends on the eccentricity value of the control ring.
• the valve opening area increases with decreasing eccentricity of the control ring in the regulation mode.
• the allowed leakage flow through the valve opening increases with decreasing eccentricity of the control ring and is normally relatively high at higher rotational speed.
• the leakage flow thereby autonomously adapts to the increasing hydraulic pressure forces in the regulation mode.
• the vane pump is provided with a second separate pressure relief valve comprising a separate valve opening at the axial sidewall of the pump housing cover.
• This pressure relief valve are identical with the first valve at the axial sidewall of the pump housing.
• the cross-sectional area of each groove can be reduced to improve the throttling effect of the groove shape, but without affecting the total valve opening area.
• a second valve improves the reliability, if one of the grooves is blocked, for example, by pollution with particles.
• figure 1 shows a total schematic cross-sectional view of a variable displacement lubricant pump with a pressure relief valve according to the invention at a minimum eccentricity value with an open pressure relief valve
• figure 2a shows an enlarged schematic cross-sectional view of the variable displacement lubricant pump of figure 1 at a maximum eccentricity value with a closed pressure relief valve
• figure 2b shows an enlarged schematic cross-sectional view of the variable displacement lubricant pump of figure 1 at a minimum eccentricity value with an open pressure relief valve
• figure 3 shows a schematic longitudinal sectional view through the open pressure relief valve of the variable displacement lubricant pump of figure 1 without the control ring.
• the number of vanes 30 can alternatively be more or less than nine.
• the volume of each pumping compartment 40 continuously increases to thereby suck-in the lubricant through the suction opening 18.
• the volume of each pumping compartment 40 continuously decreases to thereby discharge the lubricant through the discharge opening 19.

Landscapes

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

Priority Applications (2)

Applications Claiming Priority (1)

Publications (1)

Family

ID=73198330

Family Applications (1)

Country Status (2)

Citations (4)

• 2020
  • 2020-11-09 WO PCT/EP2020/081508 patent/WO2022096134A1/en active Application Filing
  • 2020-11-09 EP EP20803829.9A patent/EP4240973A1/de active Pending

Patent Citations (4)

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