EP3371430A1 - Kühlmittelpumpe für eine verbrennungskraftmaschine - Google Patents
Kühlmittelpumpe für eine verbrennungskraftmaschineInfo
- Publication number
- EP3371430A1 EP3371430A1 EP16785430.6A EP16785430A EP3371430A1 EP 3371430 A1 EP3371430 A1 EP 3371430A1 EP 16785430 A EP16785430 A EP 16785430A EP 3371430 A1 EP3371430 A1 EP 3371430A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- coolant pump
- internal combustion
- combustion engine
- coolant
- control 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.)
- Granted
Links
- 239000002826 coolant Substances 0.000 title claims abstract description 76
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 24
- 238000007789 sealing Methods 0.000 claims description 36
- 230000002093 peripheral effect Effects 0.000 claims description 23
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 6
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 6
- -1 polytetrafluoroethylene Polymers 0.000 claims description 2
- 230000001105 regulatory effect Effects 0.000 abstract description 3
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 4
- 238000001816 cooling Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000005923 long-lasting effect Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 210000000056 organ Anatomy 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P7/00—Controlling of coolant flow
- F01P7/14—Controlling of coolant flow the coolant being liquid
- F01P7/16—Controlling of coolant flow the coolant being liquid by thermostatic control
- F01P7/162—Controlling of coolant flow the coolant being liquid by thermostatic control by cutting in and out of pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P7/00—Controlling of coolant flow
- F01P7/14—Controlling of coolant flow the coolant being liquid
- F01P7/16—Controlling of coolant flow the coolant being liquid by thermostatic control
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
- F04D15/0027—Varying behaviour or the very pump
- F04D15/0038—Varying behaviour or the very pump by varying the effective cross-sectional area of flow through the rotor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/08—Sealings
- F04D29/086—Sealings especially adapted for liquid pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P7/00—Controlling of coolant flow
- F01P7/14—Controlling of coolant flow the coolant being liquid
- F01P2007/146—Controlling of coolant flow the coolant being liquid using valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2270/00—Control
- F05D2270/60—Control system actuates means
- F05D2270/64—Hydraulic actuators
Definitions
- the invention relates to a coolant pump for an internal combustion engine having a drive shaft, a coolant pump impeller, which is arranged on the drive shaft at least rotationally fixed and via which coolant is conveyed, an adjustable control slide, via which a flow cross-section of an annular gap between an outlet of the coolant pump impeller and the surrounding conveyor channel regulated is.
- Such coolant pumps are used in internal combustion engines to control the amount of subsidized coolant in order to prevent overheating of the internal combustion engine.
- the drive of these pumps is usually via a belt or chain drive, so that thedeffenpumpenrad is driven by the speed of the crankshaft or a fixed ratio to the speed of the crankshaft.
- the pumped coolant quantity is to be adapted to the coolant requirement of the internal combustion engine or of the motor vehicle.
- the cold running phase of the engine should be shortened. This is done, inter alia, by throttling or completely shutting off the coolant flow during this phase.
- the most accurate and low-friction adjustment of the control slide is to be guaranteed in all positions, so that only small actuating forces are needed.
- control slide an inner hollow cylindrical peripheral wall, on whose radial inner side a radial groove is formed, in which a sealing ring is arranged and has an outer hollow cylindrical peripheral wall, on the radial outer side of a radial groove is formed, in which a sealing ring is arranged, wherein the Both peripheral walls are connected to one another via a bottom, a reliable and a leakage-minimizing sealing of the slider front side is provided to the slider back.
- the sealing rings can serve as sliding elements, so that a reliable two-sided guidance of the slide is achieved, by tilting, by which the function of the control slide would be disabled, is prevented and the friction forces occurring during the adjustment can be reduced.
- the sealing rings are PTFE (polytetrafluoroethylene) rings. These have a low coefficient of friction and in addition have a high resistance to wear even against corrosive liquids, such as glycol-containing coolant.
- PTFE polytetrafluoroethylene
- the sealing rings have a slot. This facilitates the installation of the sealing rings, which can be easily bent at first, in order to mount them in the corresponding radial groove.
- the open piston ring allows the one-piece design of the control slide, so that the production of the control slide is simplified.
- the slot extends obliquely to the central axis of the sealing ring. Due to the oblique course of the slot, it is automatically closed when the pressure difference or during movement, since the two inclined surfaces are pressed against each other. Accordingly, a high tightness despite the existing slot and the consequent simplified assembly is achieved.
- the sealing ring arranged on the inside of the inner hollow-cylindrical circumferential wall slides on a machined outer surface of a cylindrical section of a first housing part of the coolant pump.
- a high coaxiality is generated, so that can be manufactured with tight tolerances, which in turn leads to low leakage.
- the existing friction is minimized because the control slide on a simple to be machined from the outside surface which, for example, can be processed to a surface roughness with a mean roughness of less than 0.3 ⁇ m.
- the sealing ring arranged on the outer side of the outer hollow-cylindrical circumferential wall slides on a machined inner surface of an axially extending annular projection of a second housing part of the coolant pump.
- These coolant pumps are often used in a non-machined housing portion of the crankcase of the internal combustion engine, which can lead to leaks.
- the arrangement of the sealing ring within the contemplatsteckenden housing can still be achieved in all positions of the control slide on its outer periphery an effective seal.
- the outer hollow cylindrical peripheral wall has a shoulder from which extends the outer hollow cylindrical peripheral wall in the direction of the coolant pump impeller with an enlarged outer circumference, wherein the outer diameter of this enlarged diameter portion substantially to the outer diameter of the axially extending annular projection of the second housing part corresponds.
- a pump can be used in a cylindrical recess of the crankcase. In this case, on the one hand the tightness of the slide is ensured and on the other hand to avoid large occurring gap on the slider or a necessary reduction of the coolant pump impeller avoided.
- the shoulder in the fully retracted position of the control slide abuts axially against one end of the annular projection of the second housing part.
- an enlarged contact surface of the slider is reliably prevented in its bottom region in its retracted position, which could lead to increased closing forces.
- the bottom separates a first pressure chamber from a second pressure chamber, so that the control slide is displaceable as a function of a pressure difference between the two pressure chambers.
- large force application surfaces of the control slide can be used, so that even lower pressure differences suffice for adjustment.
- return springs can be omitted.
- the two pressure chambers are advantageously sealed by the two sealing rings relative to the respective other pressure chamber.
- the leaks between the two pressure chambers are significantly reduced in accordance with the precise and rapid adjustment with minimal effort compared to known designs.
- Figure 1 shows a side view of a coolant pump according to the invention in a sectional view.
- FIG 2 shows a rotated to Figure 1 side view of the coolant pump according to the invention in a sectional view.
- the coolant pump according to the invention consists of an outer housing 10, in which a spiral conveying channel 12 is formed, in which a coolant is sucked in via an axial pump inlet 14 also formed in the outer housing 10, which via the conveying channel 12 to a formed in the outer housing 10 tangential pump outlet 16 and is conveyed into a cooling circuit of the internal combustion engine.
- This outer housing 10 may for example be formed integrally with the crankcase or the cylinder head of an internal combustion engine.
- a coolant pump impeller 20 is fixed radially inside the conveying channel 12 on a drive shaft 18, which is designed as a Radialpumpenrad, by the rotation of the promotion of the coolant takes place in the conveying channel 12.
- a control pump impeller 22 is formed, which is rotated in accordance with the coolant pump impeller 20.
- This control pump impeller 22 has blades 23 which are arranged axially opposite to a flow channel 24 formed as a side channel, which is formed in a first inner housing part 26.
- control pump impeller 22 forms a control pump 28 with the flow channel 24, via which the pressure of the coolant from the inlet of the control pump 28 is increased to the outlet.
- the pulley 30 is mounted on a double-row ball bearing 32, the outer ring 34 is pressed on the pulley 30 and the inner ring 36 on a second fixed housing part 38.
- the second Housing part 38 has an inner axial passage opening 40 through which the drive shaft 18 protrudes with the interposition of a shaft seal 42 and into which an inner annular projection 44 of the first housing part 26 projects, via which the first housing part 26 is centered to the second housing part 38.
- the first housing part 26 is fastened to the second housing part 38 via screws 46, which axially penetrate the first housing part 26.
- the second housing part 38 is secured to the outer housing 10 with the interposition of a seal 48.
- the outer housing 10 at its pump inlet 14 opposite axial end has a receiving opening 50 of constant diameter, into which an annular projection 52 of the second housing part 38 projects, at the limiting flange wall 54 which bears axially against the outer housing 10, a groove 56th is formed, in which the seal 48 is arranged.
- This projection 52 also serves as a rear stop for a control slide 58, the radially outer hollow cylindrical peripheral wall 60 can be pushed over the coolant pump impeller 20 that a free cross section of an annular gap 62 between an outlet 64 of the coolant pump impeller 20 and the delivery channel 12 is controlled. In accordance with the position of this control slide 58, the coolant flow conveyed through the coolant circuit is thus regulated.
- This peripheral wall 60 has correspondingly a shoulder 66, from which the peripheral wall 60 with an enlarged diameter extends further axially in the direction of the annular gap 62.
- this portion 68 corresponds approximately to the outer diameter of the annular projection 52, so that the annular projection 52 and this portion 68 of the peripheral wall 60 are formed directly opposite to an inner wall 70 of the receiving opening 50 of the outer housing 10, whereby gaps are minimized in this area ,
- a sealing ring 76 is arranged, which is made of PTFE.
- the sealing ring 76 is arranged such that it abuts in each position of the control slide 58 on a machined inner surface 78 of the annular projection 52 of the second housing part 38. Due to the machining, this inner surface 78 has a very low roughness, so that it serves as a low-friction sliding and sealing surface for the sealing ring 76.
- the control slide 58 has, in addition to the peripheral wall 60, a bottom 80 with an inner opening 82, from the outer periphery of which the peripheral wall 60 extends axially and from the inner circumference of which a shorter inner hollow cylindrical peripheral wall 84 extends in the direction of the coolant pump impeller 20.
- a radial groove 86 is formed, in which a sealing ring 88 is also made of PTFE, which is insensitive to the coolant and has good sliding properties.
- the peripheral wall 84 slides on a likewise machined outer surface 89 of an axially extending cylindrical portion 90 of the first housing part 26, which is formed between the annular projection 44 and the flow channel 24 forming portion of the first housing part 26.
- the section 90 serves to support the control slide 58.
- the two machined surfaces 78, 89 have to ensure a low-friction guidance a center roughness of about 0.3 ⁇ on. This has the consequence that when moving the control slide 58 only small actuating forces are required and a high density between the front and the back of the control slide 58 is achieved.
- a first pressure chamber 92 is formed axially through the second housing part 38 and the bottom 80 of the control slide 58 and radially outwardly through the annular projection 52 of the second housing part 38 and radially inward through the first housing part 26 is limited and on the side facing the coolant pump impeller 20 of the bottom 80, a second pressure chamber 94 is formed axially through the bottom plate 80 and the first housing part 26, radially outwardly through the peripheral wall 60 of the control slide 58 and radially inward is limited by the portion 90 of the first housing part 26.
- the slots 96, 98 are formed so that the sealing rings are opened at the periphery by this slot 96, 98, so that bending up for assembly is possible.
- the slots 96, 98 do not extend in the axial direction, but are inclined to the central axis by at least 30 °.
- the pressure difference required for this purpose is generated by the control pump 28 and supplied to the respective pressure chamber 92, 94 by means of a valve 100, which is designed as a solenoid valve.
- a valve 100 which is designed as a solenoid valve.
- channels are formed in the two housing parts 26, 38, can be supplied via the pressurized coolant to the respective pressure chamber or can be discharged from this, so that as a result this pressure difference of the control slide 58 is pushed to reduce the pumped coolant amount in the annular gap 62 or pushed out to maximize the funded in the cooling circuit coolant amount from this.
- the coolant pump described has a very precise inner guide, so that only small actuating forces are required despite small gaps, which is further enhanced by the good sliding properties of the sliding surfaces opposite the sealing surfaces. Due to the used, long-lasting and good sliding sealing rings, the pressure chambers are reliably sealed against each other, so that an adjustment of the control slide with low actuating forces is possible, while a pressure equalization between the pressure chambers is strongly delayed in time.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102015119093.1A DE102015119093A1 (de) | 2015-11-06 | 2015-11-06 | Kühlmittelpumpe für eine Verbrennungskraftmaschine |
PCT/EP2016/075079 WO2017076647A1 (de) | 2015-11-06 | 2016-10-19 | Kühlmittelpumpe für eine verbrennungskraftmaschine |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3371430A1 true EP3371430A1 (de) | 2018-09-12 |
EP3371430B1 EP3371430B1 (de) | 2021-02-24 |
Family
ID=57199979
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP16785430.6A Active EP3371430B1 (de) | 2015-11-06 | 2016-10-19 | Kühlmittelpumpe für eine verbrennungskraftmaschine |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP3371430B1 (de) |
DE (1) | DE102015119093A1 (de) |
WO (1) | WO2017076647A1 (de) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2019042530A1 (de) | 2017-08-29 | 2019-03-07 | Pierburg Pump Technology Gmbh | Kühlmittelpumpe für eine verbrennungskraftmaschine |
DE102019123646B4 (de) * | 2019-09-04 | 2023-08-03 | Schaeffler Technologies AG & Co. KG | Kühlmittelregler mit einem Wellendichtring |
EP4226047A1 (de) * | 2020-10-06 | 2023-08-16 | Pierburg Pump Technology GmbH | Mechanische variable kfz-kühlmittelpumpe |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102004054637B4 (de) | 2004-11-12 | 2007-04-26 | Geräte- und Pumpenbau GmbH Dr. Eugen Schmidt | Regelbare Kühlmittelpumpe |
DE102007042866A1 (de) * | 2007-09-08 | 2009-03-12 | Geräte- und Pumpenbau GmbH Dr. Eugen Schmidt | Regelbare Kühlmittelpumpe |
DE102011012827B3 (de) * | 2011-03-02 | 2012-04-19 | Geräte- und Pumpenbau GmbH Dr. Eugen Schmidt | Vorrichtung u. Verfahren zur definierten Längsverschiebung einer in einer Antriebswelle mitdrehenden Verstellvorrichtung |
DE102011083805A1 (de) * | 2011-09-30 | 2013-04-04 | Schaeffler Technologies AG & Co. KG | Regelbare Kühlmittelpumpe mit integriertem Druckraum |
-
2015
- 2015-11-06 DE DE102015119093.1A patent/DE102015119093A1/de active Pending
-
2016
- 2016-10-19 EP EP16785430.6A patent/EP3371430B1/de active Active
- 2016-10-19 WO PCT/EP2016/075079 patent/WO2017076647A1/de unknown
Also Published As
Publication number | Publication date |
---|---|
WO2017076647A1 (de) | 2017-05-11 |
EP3371430B1 (de) | 2021-02-24 |
DE102015119093A1 (de) | 2017-05-11 |
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