EP2663752A1 - Mechanical switchable automotive coolant pump - Google Patents

Mechanical switchable automotive coolant pump

Info

Publication number
EP2663752A1
EP2663752A1 EP11700130.5A EP11700130A EP2663752A1 EP 2663752 A1 EP2663752 A1 EP 2663752A1 EP 11700130 A EP11700130 A EP 11700130A EP 2663752 A1 EP2663752 A1 EP 2663752A1
Authority
EP
European Patent Office
Prior art keywords
pump
support body
rotor
clutch
pump rotor
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Withdrawn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
EP11700130.5A
Other languages
German (de)
French (fr)
Inventor
Jean-Michel Durand
Pierre Reininger
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 EP2663752A1 publication Critical patent/EP2663752A1/en
Withdrawn legal-status Critical Current

Links

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
    • F01P5/00—Pumping cooling-air or liquid coolants
    • F01P5/10—Pumping liquid coolant; Arrangements of coolant pumps
    • F01P5/12—Pump-driving arrangements
    • 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
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00—Pumping installations or systems
    • F04D13/02—Units comprising pumps and their driving means
    • F04D13/021—Units comprising pumps and their driving means containing a coupling
    • F04D13/022—Units comprising pumps and their driving means containing a coupling a coupling allowing slip, e.g. torque converter

Definitions

  • the present invention refers to a mechanical switchable automotive cooiant pump for pumping a coolant to an automotive combustion engine.
  • a mechanical coolant pump is mechanically driven by the combustion engine so that the pumping rate is proportional to the rotational speed of the engine. Right after a cold start of the engine, no relevant coolant fiow is needed.
  • a switchable coolant pump which is provided with a ciutch for engaging or disengaging the pump rotor allows to disengage the pump rotor as long as the engine is cold and does not need a relevant coolant flow.
  • One type of clutch actuation is the electromagnetic clutch which is provided with an electromagnetic actuator which engages or disengages the clutch disc which is axiaify movable,
  • a mechanical switchable coolant pump with electromagnetic clutch actuation is provided with two roller bearings and electromagnetic means which makes the cooiant pump capacious.
  • the coolant pump according to the invention is provided with a stationary pump frame which is mountable to an engine block of the combustion engine.
  • the stationary pump frame comprises a cylindrical support body which is arranged coaxiaily with other rotating parts of the pump.
  • the pump comprises a rota table pump rotor which is provided with a pump wheel for pumping the coolant, with a pump rotor shaft and with a pump rotor clutch disc.
  • the pump rotor shaft connects the pump wheel with the pump rotor dutch disc stiffly so that the pump rotor is rotating as one part.
  • the pump rotor shaft is directly supported by a first roller bearing at the inside of the cylindrical support body.
  • the rotatable pump rotor forms a first rotating unit
  • a second rotating unit is formed by the rotatable driving rotor which is provided with a radial driving rotor clutch disc and with a cylindrical pulley wheel which is driven by the engine,
  • the driving rotor is directly supported by a separate second roller bearing at the support body.
  • One of the two clutch disks is ferromagnetic and is axia!ly movable.
  • An electromagnetic stationary clutch actuator is provided to switch or to axia!y move the movable clutch disk between an engaged and a disengaged position. When the electromagnetic actuator is energized the ferromagnetic movable clutch disk is attracted. If the ferromagnetic clutch disc is permanently magnetized, the clutch disk even can be pushed away by the electromagnetic actuator depending on the polarity of the energized actuator.
  • the stationary clutch actuator is preferably directly mounted at the support body. The two clutch disks and the electromagnetic actuator together define an electromagnetic friction clutch unit.
  • the outer ring of the pump rotor bearing is defined by the inside of the support body, i.e. is an integral part of the support body, and the inner ring of the pulley wheel bearing is directly press fitted onto the outside of the support body.
  • the two roller bearings are radially a very compact so that the radial extension of the coolant pump is compact as well.
  • a compact coolant pump is important because the installation space for the coolant pump is generally small.
  • the outside of the support body is provided with an axial cable slit which is radially covered by the inner ring of the driving rotor bearing.
  • An electrical cable for electrically supplying the coil ring is provided in the cable slit.
  • the term "axial" in the present context does not mean that the slit has to be orientated strictly axially but that the slits orientation generally has an axial component to make it possible to transport electric energy from the proximal pump rotor side of the pump frame to the distal side of the pump frame where the electromagnetic actuator is located.
  • the inner ring of 5 the pump rotor bearing is defined by the pump rotor shaft.
  • the outer and the inner ring of the pump rotor bearing are not realized as separate ring parts but are integral parts of other parts, i.e. are integral parts of the support body and the pump rotor shaft. This allows a very compact construction of the coolant pump.
  • a cylindricai spacer of non-ferromagnetic material is radially provided between the ring coil and the pump rotor shaft.
  • the spacer is directly mounted to the outside of the support body and the ring coil is mounted to the outside of the spacer.
  • the pump rotor clutch disc is the one which is axialiy movable.
  • the axialiy movable clutch disk is pretensioned into the engaged position by a pretension element.
  • the pretension element can be one or more separate coil spring(s).
  • the pretension element can be realized as a part of the movable clutch disc which is formed as a cup spring, whereby a ringlike part of the cup spring is defining a clutch ring.
  • figure 1 shows the longitudinal cross section of a mechanical switchable automotive coolant pump mounted to an engine block.
  • the figure shows a longitudinal cross-section of the coolant pump 10 which is mounted to the block 15 of an internal combustion engine 14.
  • the coolant pump 10 is a mechanical coolant pump which is driven by a pulley belt 60 which is driven by the engine 14.
  • the coolant pump 10 is switchable which means that the permanent rotation transmitted by the pulley belt 60 can be transmitted or non-transmitted to a pump wheel 20 pumping the coolant by switching the electrical clutch unit 62.
  • the coolant pump 10 comprises a stationary pump frame 12 with a flange 13 and a support body 28.
  • the flange 13 is directly mounted to the corresponding opening flange of the engine block 15.
  • the pump frame support body 28 is generally cylindrical and Is supporting all rotating units, as will be described.
  • a rotatabie pump rotor 16 comprises the pump wheel 20 for pumping the coolant, a pump rotor shaft 22 and a pump rotor clutch disc 38 with a ferromagnetic clutch ring 39, A circular sealing 58 is provided to seal the gap between the pump frame 12 and the rotor shaft 22 water-tight.
  • the pump rotor clutch disk 38 is realized as a disk spring, so that the clutch ring 39 of the clutch disk 38 is axially movable.
  • the disk spring pushes the clutch ring 39 in distal direction into an engaged position.
  • the pump rotor 16 is rotatabiy supported at the support body 28 by a rotor bearing 30.
  • the inner ring and the outer ring of the rotor bearing 30 are integral parts of the pump rotor shaft 22 and of the cylindrical pump frame support body 28, and therefore are defined by the outside 24 of the pump rotor shaft 22 and by the inside 26 of the cylindrical support body 28.
  • a rotatabie driving rotor 18 is defined by a cylindrical pulley wheel 34, which is driven by the pulley belt 60, and a ringlike radial clutch disc 36.
  • the driving rotor 18 is rotatabiy supported at the outside of the pump frame support body 28 by means of a driving rotor roller bearing 32 which is a conventional roller bearing with a separate outer ring 44 and a separate inner ring 46.
  • the inner ring 46 of the roller bearing 32 is press fitted to the outside of the support body 28.
  • the pulley wheel 34 is provided with a support structure 48 which is T-shaped in cross section whereby the cylindrical cross bar is press fitted to the outside of the outside ring 44 of the driving rotor roller bearing 32.
  • a stationary clutch actuator 40 is defined by a circular coil ring 41 which is directly fixed at the support body 28, whereby a non-ferromagnetic spacer 42 made out of plastic, aluminum or copper is arranged radially between the coil ring 41 and the support body 28,
  • the coil ring 41 is electrically connected to the pump control 50 via an electrical cable 54 which is placed in an axial cable slit 52 which is provided at the outside surface of the cylindrical support body 28.
  • the cable slit can alternatively be provided at the inner ring 46 of the driving rotor roller bearing 32.
  • the clutch actuator 40, the driving rotor clutch disc 36 and the pump rotor clutch disc 38 together define a clutch unit 62.
  • the axialiy movable pump rotor clutch ring 39 is moved in proximal direction into a disengaged position.
  • the clutch ring 39 is moved in distal direction into an engaged position so that the clutch is engaged and the rotation of the driving rotor 18 is transmitted to the pump rotor 16, so that the pump wheel 20 is rotating.

Abstract

A mechanical switchable automotive coolant pump (10) for pumping a coolant to an automotive combustion engine (14) comprises: a stationary pump frame (12) being mountable to an engine block (15) and comprising an axial cylindrical support body (28), a rotatable pump rotor (16) comprising a pump wheel (20), a pump rotor shaft (22) and a pump rotor dutch disk (38), whereby the pump rotor shaft (22) is directly supported by a roller bearing (30) at the support body (2.8), and a rotatable driving rotor (18) comprising a pulley wheel (34) and a driving clutch disk (36), whereby the driving rotor (18) is directly supported by a separate roller bearing (32) at the support body (28), wherein one of the clutch disks (38) is ferromagnetic and axially movable, whereby an electromagnetic clutch actuator (40) is provided to switch the movable clutch disk (38) between an engaged and a disengaged position, the clutch actuator (40) being stiffly mounted at the support body (28), wherein the outer ring (26) of the pump rotor bearing (30) is defined by the inside (28) of the support body and the inner ring (46) of the pulley wheel bearing (32) is directly press fitted onto the outside of the support body (28),

Description

Mechanical switchable automotive coolant pump
The present invention refers to a mechanical switchable automotive cooiant pump for pumping a coolant to an automotive combustion engine.
A mechanical coolant pump is mechanically driven by the combustion engine so that the pumping rate is proportional to the rotational speed of the engine. Right after a cold start of the engine, no relevant coolant fiow is needed. A switchable coolant pump which is provided with a ciutch for engaging or disengaging the pump rotor allows to disengage the pump rotor as long as the engine is cold and does not need a relevant coolant flow. One type of clutch actuation is the electromagnetic clutch which is provided with an electromagnetic actuator which engages or disengages the clutch disc which is axiaify movable, A mechanical switchable coolant pump with electromagnetic clutch actuation is provided with two roller bearings and electromagnetic means which makes the cooiant pump capacious.
It is an object of the invention to provide a compact mechanical and e!ectromagnetica!ly switchable automotive coolant pump.
This object is solved with a coolant pump with the features of claim 1.
The coolant pump according to the invention is provided with a stationary pump frame which is mountable to an engine block of the combustion engine. The stationary pump frame comprises a cylindrical support body which is arranged coaxiaily with other rotating parts of the pump.
The pump comprises a rota table pump rotor which is provided with a pump wheel for pumping the coolant, with a pump rotor shaft and with a pump rotor clutch disc. The pump rotor shaft connects the pump wheel with the pump rotor dutch disc stiffly so that the pump rotor is rotating as one part. The pump rotor shaft is directly supported by a first roller bearing at the inside of the cylindrical support body. The rotatable pump rotor forms a first rotating unit,
A second rotating unit is formed by the rotatable driving rotor which is provided with a radial driving rotor clutch disc and with a cylindrical pulley wheel which is driven by the engine, The driving rotor is directly supported by a separate second roller bearing at the support body.
One of the two clutch disks is ferromagnetic and is axia!ly movable. An electromagnetic stationary clutch actuator is provided to switch or to axia!!y move the movable clutch disk between an engaged and a disengaged position. When the electromagnetic actuator is energized the ferromagnetic movable clutch disk is attracted. If the ferromagnetic clutch disc is permanently magnetized, the clutch disk even can be pushed away by the electromagnetic actuator depending on the polarity of the energized actuator. The stationary clutch actuator is preferably directly mounted at the support body. The two clutch disks and the electromagnetic actuator together define an electromagnetic friction clutch unit.
The outer ring of the pump rotor bearing is defined by the inside of the support body, i.e. is an integral part of the support body, and the inner ring of the pulley wheel bearing is directly press fitted onto the outside of the support body. The two roller bearings are radially a very compact so that the radial extension of the coolant pump is compact as well. A compact coolant pump is important because the installation space for the coolant pump is generally small.
According to another preferred embodiment of the invention, the outside of the support body is provided with an axial cable slit which is radially covered by the inner ring of the driving rotor bearing. An electrical cable for electrically supplying the coil ring is provided in the cable slit. The term "axial" in the present context does not mean that the slit has to be orientated strictly axially but that the slits orientation generally has an axial component to make it possible to transport electric energy from the proximal pump rotor side of the pump frame to the distal side of the pump frame where the electromagnetic actuator is located.
According to a preferred embodiment of the invention, the inner ring of 5 the pump rotor bearing is defined by the pump rotor shaft. This means that the outer and the inner ring of the pump rotor bearing are not realized as separate ring parts but are integral parts of other parts, i.e. are integral parts of the support body and the pump rotor shaft. This allows a very compact construction of the coolant pump.
10 According to a preferred embodiment of the invention, a cylindricai spacer of non-ferromagnetic material is radially provided between the ring coil and the pump rotor shaft. The spacer is directly mounted to the outside of the support body and the ring coil is mounted to the outside of the spacer. Providing a non-ferromagnetic spacer radially between the ring coil and the support body makes the electromagnetic actuator more efficient in axia! direction.
According to a preferred embodiment of the invention the pump rotor clutch disc is the one which is axialiy movable.
Preferably, the axialiy movable clutch disk is pretensioned into the engaged position by a pretension element. The pretension element can be one or more separate coil spring(s). Alternatively, the pretension element can be realized as a part of the movable clutch disc which is formed as a cup spring, whereby a ringlike part of the cup spring is defining a clutch ring.
One embodiment of the invention is described with reference to the drawing, wherein
figure 1 shows the longitudinal cross section of a mechanical switchable automotive coolant pump mounted to an engine block.
The figure shows a longitudinal cross-section of the coolant pump 10 which is mounted to the block 15 of an internal combustion engine 14. The coolant pump 10 is a mechanical coolant pump which is driven by a pulley belt 60 which is driven by the engine 14. The coolant pump 10 is switchable which means that the permanent rotation transmitted by the pulley belt 60 can be transmitted or non-transmitted to a pump wheel 20 pumping the coolant by switching the electrical clutch unit 62.
The coolant pump 10 comprises a stationary pump frame 12 with a flange 13 and a support body 28. The flange 13 is directly mounted to the corresponding opening flange of the engine block 15. The pump frame support body 28 is generally cylindrical and Is supporting all rotating units, as will be described.
A rotatabie pump rotor 16 comprises the pump wheel 20 for pumping the coolant, a pump rotor shaft 22 and a pump rotor clutch disc 38 with a ferromagnetic clutch ring 39, A circular sealing 58 is provided to seal the gap between the pump frame 12 and the rotor shaft 22 water-tight.
The pump rotor clutch disk 38 is realized as a disk spring, so that the clutch ring 39 of the clutch disk 38 is axially movable. The disk spring pushes the clutch ring 39 in distal direction into an engaged position. The pump rotor 16 is rotatabiy supported at the support body 28 by a rotor bearing 30. The inner ring and the outer ring of the rotor bearing 30 are integral parts of the pump rotor shaft 22 and of the cylindrical pump frame support body 28, and therefore are defined by the outside 24 of the pump rotor shaft 22 and by the inside 26 of the cylindrical support body 28.
A rotatabie driving rotor 18 is defined by a cylindrical pulley wheel 34, which is driven by the pulley belt 60, and a ringlike radial clutch disc 36. The driving rotor 18 is rotatabiy supported at the outside of the pump frame support body 28 by means of a driving rotor roller bearing 32 which is a conventional roller bearing with a separate outer ring 44 and a separate inner ring 46. The inner ring 46 of the roller bearing 32 is press fitted to the outside of the support body 28. The pulley wheel 34 is provided with a support structure 48 which is T-shaped in cross section whereby the cylindrical cross bar is press fitted to the outside of the outside ring 44 of the driving rotor roller bearing 32.
A stationary clutch actuator 40 is defined by a circular coil ring 41 which is directly fixed at the support body 28, whereby a non-ferromagnetic spacer 42 made out of plastic, aluminum or copper is arranged radially between the coil ring 41 and the support body 28, The coil ring 41 is electrically connected to the pump control 50 via an electrical cable 54 which is placed in an axial cable slit 52 which is provided at the outside surface of the cylindrical support body 28. The cable slit can alternatively be provided at the inner ring 46 of the driving rotor roller bearing 32. The clutch actuator 40, the driving rotor clutch disc 36 and the pump rotor clutch disc 38 together define a clutch unit 62.
When the coil ring 41 is energized by the pump control 50, the axialiy movable pump rotor clutch ring 39 is moved in proximal direction into a disengaged position. When the coil ring 41 is not energized, the clutch ring 39 is moved in distal direction into an engaged position so that the clutch is engaged and the rotation of the driving rotor 18 is transmitted to the pump rotor 16, so that the pump wheel 20 is rotating.

Claims

CLAIMS 1, Mechanical switchable automotive coolant pump (10) for pumping a coolant to an automotive combustion engine (14) , comprising:
a stationary pump frame (12) being mountable to an engine block (15) and comprising an axial cylindrical support body (28) , a rotatable pump rotor (16) comprising a pump wheel (20) , a pump rotor shaft (22) and a pump rotor clutch disk (38) , whereby the pump rotor shaft (22) is directly supported by a roller bearing (30) at the support body (28) , and
a rotatable driving rotor (18) comprising a pulley wheei (34) and a driving rotor clutch disk (36), whereby the driving rotor (18) is directly supported by a separate roller bearing (32) at the support body (28),
wherein one of the clutch disks (38) is ferromagnetic and axially movable, whereby an electromagnetic stationary clutch actuator (40) is provided to switch the movable clutch disk (38) between an engaged and a disengaged position, the clutch actuator (40) being mounted at the support body (28),
wherein the outer ring (26) of the pump rotor bearing (30) is an integral part of the support body, and the inner ring (46) of the pulley wheel bearing (32) is directly press fitted onto the outside of the support body (28).
2. Mechanical coolant pump (10) of claim 1, wherein the clutch actuator (40) is a circular coll ring (41) being axially arranged between the driving rotor bearing (32) and the movable clutch disk (38), whereby the coil ring (41) is directly press fitted to the outside of the support body (28).
3. Mechanical coolant pump (10) of one of the preceding claims, wherein the outside of the support body (28) is provided with an axial cable slit (52) which is radially covered by the inner ring (46) of the driving rotor bearing (32), whereby an electrical cable (54) for electrically supplying the ring coif (41) is provided in the cable slit (52).
4. Mechanical coolant pump (10) of one of the preceding claims, wherein the inner ring (24) of the pump rotor bearing (30) is an integral part of the pump rotor shaft (22) ,
5. Mechanical coolant pump (10) of one of the preceding claims, wherein a cylindrical spacer (42) of non-ferromagnetic material is provided radially between the ring coil (41) and the pump rotor shaft (22),
6. Mechanical coolant pump (10) of one of the preceding claims, wherein the pump rotor clutch disc (38) is axially movable.
7. Mechanical coolant pump (10) of one of the preceding claims, wherein the axially movable clutch disc (38) is pretensioned into the engaged position by a pretension element.
EP11700130.5A 2011-01-11 2011-01-11 Mechanical switchable automotive coolant pump Withdrawn EP2663752A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2011/050258 WO2012095167A1 (en) 2011-01-11 2011-01-11 Mechanical switchable automotive coolant pump

Publications (1)

Publication Number Publication Date
EP2663752A1 true EP2663752A1 (en) 2013-11-20

Family

ID=44544118

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11700130.5A Withdrawn EP2663752A1 (en) 2011-01-11 2011-01-11 Mechanical switchable automotive coolant pump

Country Status (2)

Country Link
EP (1) EP2663752A1 (en)
WO (1) WO2012095167A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017028921A1 (en) * 2015-08-20 2017-02-23 Pierburg Pump Technology Gmbh Mechanical switchable automotive coolant pump
CN110657104B (en) * 2018-06-29 2020-12-25 北京汽车动力总成有限公司 Water pump, engine and car

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10013252A1 (en) * 2000-03-17 2001-10-25 Audi Ag Refrigerant pump for vehicle internal combustion engine; has mechanically driven impeller coupled by friction coupling closed by spring and opened hydraulically, electromagnetically or pneumatically
EP1353051B1 (en) * 2002-04-08 2007-07-18 Baruffaldi S.p.A. Device for controlling the actuating shaft of means for recirculating a cooling fluid in vehicle engines
ITMI20050056U1 (en) * 2005-01-26 2006-08-27 Foussianes Nicholas B MOTION TRANSMISSION DEVICE FOR ROTATION TO A SHAFT DRIVEN SHAFT FOR FLUID RECIRCULATION PUMPS
DE102006021446A1 (en) * 2006-05-09 2007-11-15 Schaeffler Kg Shaft of a water pump of an internal combustion engine

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
None *
See also references of WO2012095167A1 *

Also Published As

Publication number Publication date
WO2012095167A1 (en) 2012-07-19

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