EP3371462A1 - Kühlmittelpumpe für eine verbrennungskraftmaschine - Google Patents
Kühlmittelpumpe für eine verbrennungskraftmaschineInfo
- Publication number
- EP3371462A1 EP3371462A1 EP16784874.6A EP16784874A EP3371462A1 EP 3371462 A1 EP3371462 A1 EP 3371462A1 EP 16784874 A EP16784874 A EP 16784874A EP 3371462 A1 EP3371462 A1 EP 3371462A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- coolant pump
- peripheral wall
- internal combustion
- combustion engine
- coolant
- 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
Classifications
-
- 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
Definitions
- the invention relates to a coolant pump for an internal combustion engine with a drive shaft, a coolant pump impeller which is at least rotatably mounted on the drive shaft and via which coolant is conveyed, an outer housing in which a delivery channel of the coolant pump is formed and an adjustable control slide, via which a flow cross section of Annular gaps between an outlet of the coolant pump impeller and the surrounding conveyor channel is adjustable.
- 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.
- DE 10 2004 054 637 B4 discloses a controllable coolant pump with an electrically operated control slide, on whose outer circumference a groove is formed with a piston ring arranged therein, which runs on an inner sliding surface of an outer housing of the electromagnet that the slider is stored over this surface.
- a piston ring arranged therein, which runs on an inner sliding surface of an outer housing of the electromagnet that the slider is stored over this surface.
- a hydraulically controlled pump however, such a slide is unsuitable because it is not tight in the radially inner region.
- the bearing surface is very short in the extended position of the slide, so that tilting or blocking, in particular by penetrating dirt particles, can not be ruled out, especially since the inner guide via the webs takes place in an axially remote area.
- control slide has an inner hollow cylindrical peripheral wall and an outer hollow cylindrical peripheral wall which is displaceable in the annular gap, which are connected to each other via a bottom and extending from the bottom in the direction of theméstoffpumpenankrades, wherein the inner hollow cylindrical peripheral wall on a machined outer surface a cylindrical portion of a housing part of the coolant pump is mounted, an exact inner guide is ensured, which is ensured in each position of the control slide over a sufficiently long guide portion. The friction values are low due to the machined inner surfaces.
- the outer hollow cylindrical peripheral wall is guided on a machined inner surface of an axially extending annular projection of a housing part of the coolant pump.
- an outer guide is made in the outer region of the control slide, through which the wear, for example, is reduced by penetrating dirt particles. Furthermore, a leakage-minimizing separation between the pressure chambers at the front and at the back of the slider can be achieved.
- the outer hollow cylindrical peripheral wall of the control slide on a first axial portion which slides within the annular projection and having a shoulder, from which extends the outer hollow cylindrical peripheral wall with an enlarged outer periphery in the direction of the coolant pump impeller.
- the outer diameter of this enlarged diameter portion substantially corresponds to the outer diameter of the axially extending annular projection of the housing part.
- the outer housing into which the coolant pump is inserted may accordingly have a constant diameter receiving opening, and yet the leakage reduction gaps are reduced.
- the shoulder in the fully retracted position of the control slide abuts axially against one end of the annular projection of the housing part.
- a radial groove is formed on the radially inner side of the radially inner peripheral wall, in which a sealing ring is arranged, which is advantageously made of polytetrafluoroethylene and, accordingly, a high lubricity and has high corrosion resistance against known coolants such as glycol.
- a radial groove preferably made of PTFE, so that increased in the outer guide area, the tightness and friction is reduced.
- a leakage current between the front of the slide and its rear side is correspondingly minimized, whereby an occurring creeping pressure equalization between the spaces in front of and behind the slide is reduced.
- the required restoring forces are correspondingly low.
- the floor separates a first pressure chamber from a second pressure chamber.
- the two pressure chambers are sealed by the two sealing rings relative to the respective other pressure chamber, so that the control slide in response to a pressure difference between the two pressure chambers is displaced without a pressure equalization arises. Due to the low friction due to the good leadership and storage different positions of the control slide can be approached with low applied pressure differences. At the same time a pressure equalization between the pressure chambers is reduced by the high tightness over the control slide.
- a coolant pump for an internal combustion engine in which the control slide is guided very precisely, whereby occurring friction forces are reduced, so that only small actuating forces are required to control the coolant flow.
- large force application surfaces are provided for the hydraulic adjustment of the control slide.
- the pressure chambers are very well sealed against each other both in the inner region and in the outer region of the slide, so that only a minimized leakage current can arise.
- Figure 1 shows a side view of a coolant pump according to the invention in a sectional view.
- the coolant pump consists of an outer housing 10, in which a spiral conveying channel 12 is formed, in which via a likewise formed in the outer housing 10 axial pump inlet 14, a coolant is sucked, which via the delivery 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 and therefore usually has an unprocessed, but only cast inner surface.
- a coolant pump impeller 20 which is designed as a radial pump impeller, is fastened radially on the inside of the delivery channel 12 on a drive shaft 18.
- 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.
- Regulating pump impeller 22 via a belt of the internal combustion engine, which is rotated with the crankshaft of the internal combustion engine and engages in a pulley 30 which is fixed to the coolant pump impeller 20 opposite axial end of the drive shaft 18.
- 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 projects 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.
- an axially displaceable control slide 58 is arranged within the receiving opening 50, 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 conveyor channel 12th is regulated.
- Circumferential wall 60 an axially shorter inner hollow cylindrical peripheral wall 66 which is connected via a closed between the peripheral walls 60, 66 bottom 68 with the outer peripheral wall 60. The two peripheral walls 60, 66 extending from the bottom 68 in the direction of the pump impeller 20.
- the outer surface 72 is machined to a center roughness of about 0.3 ⁇ , whereby a very low-friction storage is achieved.
- This inner bearing ensures a very precise guidance of the control slide 58, by which tilting or tilting of the control slide 58 is reliably avoided even with applied pressures.
- the radially outer peripheral wall 60 has a first portion 76 extending axially from the bottom 68, which slides with its radially outer side 78 on a machined inner surface 80 of the annular projection 52 and has a smaller outer diameter than a second adjoining the first portion 76 Section 82 of the outer peripheral wall 60, whose outer diameter corresponds approximately to the outer diameter of the annular projection 52 and which is displaceable in the annular gap 62.
- the peripheral wall 60 has a shoulder 84 from which the enlarged diameter peripheral wall 60 extends further axially in the direction of the annular gap 62 and with which the peripheral wall 60 abuts against an end 86 of the annular projection 52 in the fully retracted position. so that this end 86 serves as a rear stop for the control slide 58.
- the second portion 82 of the peripheral wall 60 is directly opposite to an inner wall 88 of the between the inner wall 88 and the radially outer side 78 of the second portion 82 of the peripheral wall 60, whereby the gaps in this area are minimized.
- a radial groove 90 is formed on the outer side 78, in which a sealing ring 92 is arranged, which is preferably made of PTFE.
- the sealing ring 92 is arranged such that it rests in each position of the control slide 58 on the machined inner surface 80 of the annular projection 52 of the second housing part 38, so that achieved by this sealing ring 92 in addition to the low-friction and precise guidance and a good and long-lasting seal is minimized by the leakage between the projection 52 and the outer peripheral wall 60.
- a radial groove 94 is formed, in which also a sealing ring 96 is arranged, which is preferably made of PTFE, which is insensitive to the coolant and has good sliding properties.
- a first pressure chamber 98 is formed axially through the second housing part 38 and the bottom 68 of the control slide 58 and radially outwardly through the annular projection 52 of the second housing part 38 and is bounded radially inwardly by serving as a bearing surface cylindrical portion 74 of the first housing part 26 and on the side facing the coolant pump impeller 20 side of the bottom 68, a second pressure chamber 100th 26 is bounded radially outwardly by the peripheral wall 60 of the control slide 58 and radially inward again by the portion 74 of the first housing part 26.
- the necessary to adjust the control slide 58 pressure difference is generated by the control pump 28 and by means of a valve 102 which is designed as a solenoid valve, the respective pressure chamber 98, 100, respectively.
- a valve 102 which is designed as a solenoid valve, the respective pressure chamber 98, 100, respectively.
- channels are formed in the two housing parts 26, 38 can be supplied via the pressurized coolant to the respective pressure chamber 98, 100 and can be discharged from this, so that as a result of this pressure difference of the control slide 58 pushed to minimize the amount of coolant conveyed into 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 and low-friction inner bearing and additional outer guide, so that despite small gaps only small actuating forces are required, which is reinforced by the good sliding properties of the circumferential walls opposite sliding surfaces.
- the pressure chambers are additionally sealed against each other, so that a while a pressure equalization between the pressure chambers is delayed.
- large force application surfaces are provided at the bottom of the control slide for its hydraulic adjustment. A guide over unprocessed surfaces in the region of the receiving opening of the outer housing is avoided.
- the scope of the main claim is not limited to the embodiment described.
- other housing divisions or another type of actuation of the control slide are conceivable.
- the two sliding surfaces of the housing can be formed on a housing part, which allows even more accurate guidance by more accurate tolerances can be produced.
- other sealing rings having good sliding and sealing properties which are insensitive to corrosion by refrigerants such as glycol may be used.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102015119089.3A DE102015119089B4 (de) | 2015-11-06 | 2015-11-06 | Kühlmittelpumpe für eine Verbrennungskraftmaschine |
| PCT/EP2016/075077 WO2017076646A1 (de) | 2015-11-06 | 2016-10-19 | Kühlmittelpumpe für eine verbrennungskraftmaschine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP3371462A1 true EP3371462A1 (de) | 2018-09-12 |
| EP3371462B1 EP3371462B1 (de) | 2020-12-02 |
Family
ID=57184441
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP16784874.6A Not-in-force EP3371462B1 (de) | 2015-11-06 | 2016-10-19 | Kühlmittelpumpe für eine verbrennungskraftmaschine |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP3371462B1 (de) |
| DE (1) | DE102015119089B4 (de) |
| WO (1) | WO2017076646A1 (de) |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE881306C (de) * | 1941-10-28 | 1953-06-29 | Voith Gmbh J M | Kreiselpumpe mit Spaltringschuetze |
| US4070132A (en) * | 1976-11-02 | 1978-01-24 | Baltimore Aircoil Company, Inc. | Variable performance pump |
| DE102004054637B4 (de) | 2004-11-12 | 2007-04-26 | Geräte- und Pumpenbau GmbH Dr. Eugen Schmidt | Regelbare Kühlmittelpumpe |
| DE102008026218B4 (de) * | 2008-05-30 | 2012-04-19 | Geräte- und Pumpenbau GmbH Dr. Eugen Schmidt | Regelbare Kühlmittelpumpe |
| DE102009048349B3 (de) * | 2009-10-06 | 2010-11-18 | Geräte- und Pumpenbau GmbH Dr. Eugen Schmidt | Kühlmittelpumpe |
| DE102012207387A1 (de) * | 2011-07-27 | 2013-01-31 | Mahle International Gmbh | Kühleinrichtung |
| DE102011079898A1 (de) | 2011-07-27 | 2013-01-31 | Mahle International Gmbh | Pumpe |
| DE102013018205B3 (de) * | 2013-10-30 | 2014-06-18 | Geräte- und Pumpenbau GmbH Dr. Eugen Schmidt | Regelbare Kühlmittelpumpe |
-
2015
- 2015-11-06 DE DE102015119089.3A patent/DE102015119089B4/de not_active Expired - Fee Related
-
2016
- 2016-10-19 WO PCT/EP2016/075077 patent/WO2017076646A1/de not_active Ceased
- 2016-10-19 EP EP16784874.6A patent/EP3371462B1/de not_active Not-in-force
Also Published As
| Publication number | Publication date |
|---|---|
| DE102015119089B4 (de) | 2019-03-21 |
| WO2017076646A1 (de) | 2017-05-11 |
| EP3371462B1 (de) | 2020-12-02 |
| DE102015119089A1 (de) | 2017-05-11 |
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