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
• • 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
  • F01M1/16—Controlling lubricant pressure or quantity
• • 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
  • F04C14/185—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber by varying the useful pumping length of the cooperating members in the axial direction
• • 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
  • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
  • F04C2/12—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
  • F04C2/14—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
  • F04C2/18—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with similar tooth forms
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16J—PISTONS; CYLINDERS; SEALINGS
  • F16J1/00—Pistons; Trunk pistons; Plungers
  • F16J1/005—Pistons; Trunk pistons; Plungers obtained by assembling several pieces
  • F16J1/006—Pistons; Trunk pistons; Plungers obtained by assembling several pieces of different materials
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16J—PISTONS; CYLINDERS; SEALINGS
  • F16J1/00—Pistons; Trunk pistons; Plungers
  • F16J1/08—Constructional features providing for lubrication
• • 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
  • F05C2201/00—Metals
  • F05C2201/02—Light metals
  • F05C2201/028—Magnesium
• • 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

Definitions

• the invention relates to a lubricant pump, in particular for an internal combustion engine of a motor vehicle, having a housing in which at least one pair of intermeshing gears for conveying lubricant is arranged, wherein a first of the gears on a drive shaft and the second of the gears for setting a variable delivery volume is rotatably mounted on an axially displaceable sliding unit, and having a in a receptacle of the housing axially displaceable control piston for hydraulically adjusting the position of the displacement unit, wherein the control piston has a central longitudinal axis and control edges comprehensive cylinder rings for releasing or closing of opening into the recording control channels.
• the invention relates to a control piston for a lubricant pump, in particular as described above.
• Lubricant pumps and control pistons of the type mentioned are known from the prior art.
• the delivery volume is varied or adjusted by shifting a gear of a gear pair.
• the first gear is fixedly arranged on a drive shaft, while the second gear is rotatably mounted on the displacement unit.
• the displacement unit can be hydraulically displaced or displaced axially in order to change the axial position of the second gear and thus the said overlapping area.
• an axially displaceable control piston is provided which has a central longitudinal axis and a plurality of cylinder rings.
• the diameter of the cylinder rings is chosen to be greater than that of the central longitudinal axis, wherein the outer circumferential surfaces of the cylinder rings serve as guide means in a receptacle of the housing, and wherein the cylinder rings have control edges, which serve for adjusting fürströmungsquerêten or for enabling or closing of control channels, which open into the receptacle and fluidly connected to the sliding unit.
• a disadvantage of the known lubricant pumps is that due to different thermal expansion coefficients of the control piston and the housing an exact Interaction between the control edges and opening into the receiving control channels over a wide operating temperature range, such as occurs in internal combustion engines, can not always be guaranteed, whereby the (axial) position of the second gear does not always correspond to the desired position.
• the problem underlying the invention is solved in full by the features of claims 1 and 5, respectively.
• the lubricant pump according to the invention is characterized in that the control piston is designed as a built component, wherein the cylinder rings of the control piston from a friction and / or wear to the recording reducing material are made, and the central longitudinal axis is at least partially made of a material whose Thermal expansion coefficient at least substantially equal to that of the recording. It is therefore intended that the control piston is assembled from several individual parts / is. This multi-part design is optimized by the advantageous choice of material of the items to ensure accurate adjustment of the flow rate at any time and in any operating temperature point.
• the guided in the recording cylinder rings are made of a material that leads in combination or in cooperation with the material of the receptacle or the housing to a low friction. This ensures that the control piston can always be moved without much effort in the receptacle to set desired flow cross sections for the control channels.
• the central longitudinal axis that is, at least the portions of the control piston between the cylinder rings is at least partially made of a material having a heat coefficient at least substantially equal to that of the housing, so that with temperature changes of the control piston and the recording a substantially equal (axial) length change Experienced. As a result, the control piston with the inclusion of the housing increases with a temperature increase, so to speak.
• the central longitudinal axis is at least partially made of the material of the housing.
• the central longitudinal axis is thus at least partially made of the material of the control piston bearing recording.
• the coefficient of thermal expansion of the longitudinal axis, at least in the corresponding section exactly corresponds to that of the housing, whereby - with non-moving control piston - the distance from the control edges to the respective orifices of the control channels remains the same even with larger temperature fluctuations.
• the cylinder rings are made of plastic.
• the plastic cylinder rings provide for a reduced friction between the control piston and the housing of the usually metallic housing.
• the housing is at least substantially made of aluminum or magnesium.
• a light lubricant pump is offered, in particular, the cylinder rings made of plastic in the then also made of aluminum or magnesium recording friction are displaced.
• a wear protection is formed by the advantageous combination of material of cylinder rings and recording or housing or allows low-wear operation, whereby a long life of the lubricant pump or a lubricant pump having internal combustion engine is ensured.
• the control piston according to the invention is characterized in that it is designed as a built component, wherein the cylinder rings are made of plastic, and the central longitudinal axis has at least one at least substantially made of aluminum or magnesium section, in particular as described above.
• a low-wear regulating piston is provided, which is particularly suitable for being used in lubricant pumps which have a metallic housing, in particular made of magnesium or aluminum.
• the control piston Due to the sectional design of the longitudinal axis made of aluminum or magnesium, the control piston has an advantageous thermal expansion behavior, so that the control piston at temperature changes at least substantially according to a control piston stored recording of the housing of the lubricant pump grows or shrinks, whereby by means of the control piston always desired flow cross sections of in the Recording opening control channels are adjustable.
• FIG. 2 shows a control piston of the lubricant pump in a perspective view.
• the lubricant pump 1 is designed as a control oil pump 2 and for this purpose has a housing 3 made at least essentially of aluminum or magnesium, in which a pair 4 of intermeshing toothed wheels 5 is arranged.
• the gears 5 convey a lubricant in the manner known for gear pumps.
• One of the gears is fixedly arranged on a drive shaft, while the other - visible here - gear 5 is rotatably mounted on an axially displaceable sliding unit 6 and is driven by the first gear.
• the displacement unit 6 essentially comprises a piston 7 which has two cylinder rings 8 spaced apart from one another. Between the cylinder rings 8, the gear 5 is held axially positive manner.
• the cylinder rings 8 are slidably mounted with their outer shell surface slidably in a cylindrical pump receptacle 9 of the housing 3.
• the pump receptacle 9 is designed to be longer (axially) than the displacement unit 6 such that pressure chambers 10 and 11 are formed on both sides of the displacement unit 6.
• the pressure chambers 10,11 are fluidly connected via a respective control channel 12 or 13 with a control unit 14 of the lubricant pump.
• a coil spring 30 is arranged, which serves as a damping axial stop for the displacement unit 6.
• the control unit 14 essentially comprises a cylindrical receptacle 5, in which a control piston 16 is arranged longitudinally displaceable or axially displaceable.
• the control piston 16 which is shown in an enlarged, perspective view in FIG. 2, has a central longitudinal axis 17 and four cylinder rings 18, 19, 20 and 21 whose outside diameters are each larger than that of the central longitudinal axis 17 Cylindrical rings 18 to 21 cooperate with the inside of the receptacle 15 as Axialgleitlager for the control piston 16.
• the Cylinder rings 18 to 21 are bounded axially by two control edges, of which for reasons of clarity, only the control edges 18 ', 18 "and 19', 19" of the cylinder rings 18 and 19 are provided with reference numerals.
• the control piston 16 is designed as a built component 31 and thus comprises several individual parts.
• the portion 24 of the longitudinal axis 17 between the cylinder rings 18 and 19 made of a different material than the rest of the control piston 16. While at least the cylinder rings 18 to 21 are made of plastic, the portion 24 is made of the material of the housing. 3 , so made of aluminum or magnesium. As a result, the section 24 has the same thermal expansion coefficient as the housing 3. According to a development not shown here, the sections between the cylinder rings 19 and 20 and / or 20 and 21 are preferably also made of the material of the housing.
• a coil spring 25 is held between the housing 3 and the free end face of the cylinder ring 18, against which the control piston is displaceable.
• a channel 26 the free end face 27 of the cylinder ring 21 is acted upon hydraulically with a pressure, whereby the control piston is displaced against the spring element 25 in the direction of an arrow 28.
• control channels 12 and 13 are released, whereby the hydraulic medium supplied through the channel 22 is conveyed through the channel 12 into the pressure chamber 10, and the hydraulic medium in the pressure chamber 11 escapes through the channel 13 and a venting channel 32 opening into the receptacle, wherein due to the pressure difference in the pressure chambers 10 and 1 1, the displacement unit 6 is displaced in the direction of an arrow 29.
• temperature fluctuations affect the housing 3 and the control piston 16 alike, the cylinder rings 18 and 21 always have the same distance from each other, as the mouth openings of the channels 12 and 3.
• the distance between the two control edges pairs 18 ', 18 "and 19', 19" is equal to the distance between the two mouth openings of the channels 12 and 13.
• the control piston 16 grows, so to speak, with an increase in temperature with the housing. 3 with, so that always a safe closing and releasing the control channels 12 and 13 and thus always a secure positioning of the displacement unit or a secure setting of the desired flow rate of the lubricant pump 1 is guaranteed.

Landscapes

• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Details And Applications Of Rotary Liquid Pumps (AREA)
• Rotary Pumps (AREA)
• Lubrication Of Internal Combustion Engines (AREA)

Applications Claiming Priority (2)

Publications (1)

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ID=44118765

Family Applications (1)

Country Status (6)

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Citations (1)

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• 2010
  • 2010-05-12 DE DE102010020356A patent/DE102010020356A1/de not_active Withdrawn
• 2011
  • 2011-05-11 CN CN201180023159.XA patent/CN102884323B/zh not_active Expired - Fee Related
  • 2011-05-11 EP EP11722000A patent/EP2569540A2/de not_active Withdrawn
  • 2011-05-11 US US13/697,199 patent/US9181946B2/en not_active Expired - Fee Related
  • 2011-05-11 JP JP2013509470A patent/JP5858988B2/ja not_active Expired - Fee Related
  • 2011-05-11 WO PCT/EP2011/002330 patent/WO2011141165A2/de active Application Filing

Patent Citations (1)

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