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
  • 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
• • 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
  • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
  • F16D27/00—Magnetically- or electrically- actuated clutches; Control or electric circuits therefor
  • F16D27/10—Magnetically- or electrically- actuated clutches; Control or electric circuits therefor with an electromagnet not rotating with a clutching member, i.e. without collecting rings
  • F16D27/108—Magnetically- or electrically- actuated clutches; Control or electric circuits therefor with an electromagnet not rotating with a clutching member, i.e. without collecting rings with axially movable clutching members
  • F16D27/112—Magnetically- or electrically- actuated clutches; Control or electric circuits therefor with an electromagnet not rotating with a clutching member, i.e. without collecting rings with axially movable clutching members with flat friction surfaces, e.g. discs
  • F16D27/115—Magnetically- or electrically- actuated clutches; Control or electric circuits therefor with an electromagnet not rotating with a clutching member, i.e. without collecting rings with axially movable clutching members with flat friction surfaces, e.g. discs with more than two discs, e.g. multiple lamellae

Definitions

• the invention refers to a mechanical automotive coolant pump with a wet friction clutch whereby the friction clutch is actuated by an electromagnet.
• a switchable mechanical coolant pump can be adapted to the cooling demand of the engine by engaging and disengaging a friction clutch which connects or disconnects the pulley wheel with or from the pump wheel.
• a dry friction clutch increases the axial length of the coolant pump's dry part which projects in distal direction from the engine's block into the motor compartment. If the friction clutch is arranged in the wet section of the pump, the dry sector of the coolant pump is more compact. Since the friction forces of a wet friction clutch are decreased significantly compared with a dry friction clutch, the diameter of the friction clutch ring has to be increased to guarantee the same level of transfer torque compared to a dry friction clutch .
• the switchable mechanical automotive coolant pump is provided with a wet friction clutch which is actuated by an electromagnet.
• a rotatable pump shaft is provided which supports the pulley wheel co-rotatably so that the pulley wheel always rotates with the same rotational speed as the shaft.
• the pulley wheel can be driven by the engine via a pulley belt or a gear arrangement.
• On its other axial end the shaft supports the pump wheel which is rotatable with respect to the shaft.
• the pump wheel is, for example, supported by a friction type bearing at the shaft.
• a shaft sealing is provided surrounding the shaft and separating the coolant pump into a wet section and a dry section. In the wet section all parts are in contact with the coolant which is, for example, water.
• the friction clutch is arranged in the wet pump section and is realized as a multi-disc clutch.
• the friction clutch is provided with a first pump-wheel- connected friction ring surface and a separate second pump wheel- connected friction ring surface. Both pump wheel-connected friction ring surfaces are, directly or by suitable means, co-rotatably connected with the pump wheel. Additionally, a first shaft-connected friction ring surface and a separate second shaft-connected friction ring surface are provided whereby both shaft-connected friction ring surfaces are co-rotatably connected to the shaft and are arranged opposite to the first and the second pump wheel-connected friction ring surfaces, respectively.
• the pump is provided with at least two pairs of co-operating friction ring surfaces so that the transfer torque of the wet friction clutch is increased significantly.
• One friction clutch surface is axially not shiftable or is at least provided with an axial bearing which stops or limits the axial movement of the said friction ring surface. All other friction ring surfaces are axially shiftable. At least one friction ring surface is directly pretensioned by an axial spring element into the engaged direction and is provided with a ferromagnetic element. The pretensioned friction ring surface is the friction ring surface which is the closest to the dry section. The ferromagnetic element allows to axially attract this friction ring surface with the electromagnet. The electromagnet is arranged axially opposite and adjacent to the ferromagnetic element so that the energized electromagnet axially attracts the last friction ring surface into the disengaged position.
• the first pump wheel-connected friction ring surface is defined by the backside of the pump wheel.
• the front side of the pump wheel is provided with pump wheel blades which are arranged at a pump wheel base disk lying within a more or less radial plane.
• the backside of the base disk serves as a basis for the first pump wheel-connected friction ring or defines the pump wheel-connected friction ring itself. Therefore, the pump wheel body has two functions, i.e. serving as a pumping element and as a clutch element.
• the first and the second shaft-connected friction ring surfaces are defined by both sides of the first shaft-connected clutch disk which is rotatable with respect to the pump wheel and which is co-rotating with the shaft.
• the first shaft- connected clutch disk is axially shiftable with respect to the shaft.
• the second wheel-connected friction ring surface is defined by a first wheel-connected clutch disk, whereby the first wheel-connected clutch disk is rotatable and axially shiftable with respect to the shaft.
• a second shaft- connected clutch disk is provided with a third shaft-connected friction ring surface cooperating with a third wheel-connected friction ring surface of the first wheel-connected friction clutch disk.
• the third shaft-connected friction ring surface and the third wheel-connected friction ring surface define a third friction surface pair so that the transferable torque is increased significantly without increasing the diameter of the wet clutch.
• the shaft-connected disks are provided with drive noses orientated radially inwardly and engaging axial drive slits provided at the driving shaft.
• the shaft-connected clutch disks are, with respect to rotation, form-fitted at the shaft but remain axially shiftable with respect to the shaft. The more noses-slit pairs are provided the more torque can be transferred between the shaft and of the shaft-connected clutch disks.
• an axial clutch disk stop is provided at the driving shaft to keep an axial clearance between the last clutch disk in its disengaged position and the electromagnet.
• the electromagnet is a stator part which is not rotating and which is supported by the static pump housing, it is necessary to guarantee a clearance between the electromagnet and the adjacent clutch disk in its disengaged position.
• the axial clearance between the last clutch disk in its disengaged position as well as in an engaged position should be as small as possible to minimize the magnetic losses which are dependent on the axial clearance.
• the pulley wheel is a belt pulley wheel which can be driven by a driving belt which is driven by the internal combustion engine.
• the figure shows a longitudinal cross-section of the mechanical switchable automotive coolant pump.
• the figure shows a switchable mechanical automotive coolant pump 10 with a wet friction clutch 50 which is actuated by an electromagnet 26.
• the coolant pump 10 is adapted to be mounted at the engine block of an internal combustion engine for an automobile.
• the coolant pump 10 is provided with a rota table rotor shaft 16 supporting the pulley wheel 22 which is fixed to the shaft 16 so that the pulley wheel 22 is co-rotating with the shaft.
• the shaft 16 is supported by a shaft bearing 54 which is fixed to the pump housing 20.
• the pump housing 20 can be mounted to the engine block of the internal combustion engine.
• the pulley wheel 22 is driven by driving belt 24 which is driven by the engine.
• the coolant pump 10 is separated into a wet section 12 and a dry section 14 by the housing 20 and a shaft sealing 52 which is seated in a suitable sealing seat of the housing 20.
• the pulley wheel 22 and the shaft bearing 54 are provided in the dry section 14, whereas a wet friction clutch 50 which is actuated by the electromagnet 26 and a pump wheel 18 are provided in the wet section 12.
• the pump wheel 18 is provided at the wet axial end of the shaft 16 opposite the dry axial end of the shaft 16 where the pulley wheel 22 is provided.
• the pump wheel 18 is supported by a friction bearing 21 rotatable at and with respect to the shaft 16.
• the wet axial end of the 5 shaft 16 is provided with a circular axial stop 17 defining an axial bearing for the pump wheel 18.
• the pump wheel 18 is provided with a pump wheel base disk 28 lying in radial plane and with a number of pump wheel blades 19 projecting with an axial component from the front side 27 of the wheel base disk 28.
• the wet clutch 50 comprises a backside 29 of the pump wheel base disk 28, three separate and axially shiftable clutch disks 32, 36, 40 and the static electromagnet 26 which is fixed at the wet side of the pump housing 20. All clutch disks 32, 36, 40 are axially shiftable with respect to the shaft i s 16.
• the wet clutch 50 is provided with three friction surface pairs defined by respective friction surfaces 29, 31, 33, 35, 37, 39 of the backside 29 of the pump wheel base disk 28, the front side of the second shaft-connected clutch disk 40 and of the front as well of the back sides of the first shaft- connected clutch disk 32 and of the wheel-connected clutch disk 36.
• the back side 29 of the pump wheel base disk 28 and the front side of the first shaft-connected clutch disk 32 define the first pair of friction ring surfaces 29,31.
• the backside of the first shaft-connected clutch disk 32 and the front side of the wheel-connected clutch disk 36 define the second5 pair of friction ring surfaces 33, 35.
• the backside of the wheel-connected clutch disk 36 and the front side of the second shaft-connected clutch disk 40 define the third pair of friction ring surfaces 37, 39.
• a ferromagnetic ring element 42 is provided at the backside of the second shaft- connected clutch disk 40 .
• the wheel-connected clutch disk 36 is rotatable and shiftable with respect to the shaft 16 but is co-rotating with the pump wheel 18.
• a ring of axial pins 43 is provided which cooperate with a ring of axial slits 45 provided at the outer circumference of the wheel-connected clutch disk 36. This arrangement allows an axial movement of the wheel-connected clutch disk 36 and ensures that the wheel-connected clutch disk 36 is always co-rotating with the pump wheel 18.
• the two shaft-connected clutch disks 32, 40 are provided with a ring of drive noses 57, 58 projecting radially inwardly into respective axial drive slits at the circumference of the shaft 16. This arrangement allows an axial shifting of the two shaft-connected clutch disks 32, 40, and ensures co- rotating of the shaft-connected clutch disks 32, 40 with each other and with the shaft 16.
• the dry-sided axial ends of the driving slits 56 serve as an axial clutch disk stop 60 which guarantees that there remains always an axial clearance of at least 0,1 mm between the adjacent last clutch disk 40 in its disengaged position and the electromagnet 26.
• the second and last shaft-connected clutch disk 40 is axially pretensioned into the engaged position by a spring element 44 which is axially supported by a support ring 46 provided at the shaft 16.

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• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Physics & Mathematics (AREA)
• Electromagnetism (AREA)
• Structures Of Non-Positive Displacement Pumps (AREA)

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• 2011
  • 2011-11-30 WO PCT/EP2011/071379 patent/WO2013079103A1/en active Application Filing
  • 2011-11-30 EP EP11788525.1A patent/EP2785994A1/de not_active Withdrawn

Non-Patent Citations (2)

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