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DE-102024133197-A1 - Electromagnetically actuated double-acting piston pump in cartridge design with a mounting system for accommodating two identical coil assemblies

DE102024133197A1DE 102024133197 A1DE102024133197 A1DE 102024133197A1DE-102024133197-A1

Abstract

The invention relates to an electromagnetically actuated double-acting reciprocating pump (1) in cartridge design, wherein the reciprocating pump (1) has a pump shaft (10), a pump inlet (5), and a pump outlet (6) and comprises the following: a mounting system (31) which holds two identical coil assemblies (25) axially opposite each other in a fixed position, wherein the first coil assembly (25') is configured with a first ring coil (12') and a first fixed armature (13'), and the second coil assembly (25") is configured with a second ring coil (12") and a second fixed armature (13"), a pump piston (19) which integrates the function of an armature and a delivery piston and is movably mounted along the pump shaft (10) and is arranged radially inside the first and second coil assemblies (25', 25"), a first and a second displacement chamber (24', 24"), wherein the volume of the Displacement chambers change when the pump piston (19) designed as an armature is displaced under the action of the coil assemblies (25), two identical inlet valves, namely a first inlet valve (20') and a second inlet valve (20"), two identical exhaust valves, namely a first exhaust valve (21') and a second exhaust valve (21").

Inventors

  • Wolfgang Schweiger
  • Matthias Kohlhauser

Assignees

  • Magna powertrain gmbh & co kg

Dates

Publication Date
20260513
Application Date
20241113

Claims (13)

  1. Electromagnetically actuated double-acting reciprocating pump (1) in cartridge design, wherein the reciprocating pump (1) has a pump shaft (10), a pump inlet (5), and a pump outlet (6) and comprises the following: a mounting system (31) which axially supports two identical coil assemblies (25) opposite each other, wherein the mounting system (31) comprises a central annular element (31a) which forms the pump outlet (6), wherein, extending axially from the outer circumference of the central annular element (31a), a first clamp half (72') and a second clamp half (72") are provided on both sides, forming a cylindrical receiving space for the first and second coil assemblies (25', 25"), in which the first coil assembly (25') comprises a first ring coil (12') and a first fixed armature (13'), and the second coil assembly (25") comprises a second ring coil (12") and a second fixed armature (13"), a pump piston (19) which integrates the function of an armature and a delivery piston and is movably mounted along the pump axis (10), and is arranged radially inside the first and second coil assemblies (25', 25"), coaxially, a first and a second displacement chamber (24', 24"), wherein the volume of the displacement chambers changes when the pump piston (19), designed as an armature, moves under the action of the coil assemblies (25), two identical inlet valves, namely a first inlet valve (20') and a second inlet valve (20"), two identical outlet valves, namely a first outlet valve (21') and a second outlet valve (21").
  2. Electromagnetically actuated double-acting piston pump (1) in cartridge design according to Claim 1 , characterized in that the first and second clamp halves (72', 72") are each formed from three elongated first and second tabs (31b) formed on the outer circumference of the annular element (31a), wherein the end regions of the first and second tabs (31b) preferably form first and second hooks (74', 74").
  3. Electromagnetically actuated double-acting piston pump (1) in cartridge design according to Claim 1 or 2 , characterized in that the pump piston (19) is designed as a hybrid component made of different materials.
  4. Electromagnetically actuated double-acting piston pump (1) in cartridge design according to Claim 3 , characterized in that the pump piston (19) is designed in multiple parts and comprises a hollow cylindrical anchor body (28) as a plastic injection molded part, as well as a first and second anchor iron ring (29', 29"), wherein the first anchor iron ring (29') is connected to a first end region of the anchor body (28) and the second anchor iron ring (29") is connected to an end region of the anchor body (28) opposite the first end region, wherein the connection is preferably made via a material-bonded connection and the anchor iron rings (29', 29") are manufactured as insert parts in plastic injection molding.
  5. Electromagnetically actuated double-acting piston pump (1) in cartridge design according to Claim 4 , characterized in that the anchor iron rings (29', 29") are formed at their ends with a control cone (29a), and preferably annular circumferential grooves (30) are provided on the anchor iron rings (29', 29").
  6. Electromagnetically actuated double-acting piston pump (1) in cartridge design according to Claim 3 , characterized in that the pump piston (19) comprises a hollow cylindrical armature body (28) made of a plastic material and at each end a permanent magnet ring or bar magnets which are bonded to the armature body via the plastic material.
  7. Electromagnetically actuated double-acting piston pump (1) in cartridge design according to Claim 3 , characterized in that the pump piston (19) is manufactured in one piece using a plastic injection molding process and has a hollow cylindrical armature body (28) with end-opposite circumferential ring areas with ferrous metallic or permanent magnetic particles injected into it.
  8. Electromagnetically actuated double-acting piston pump (1) in cartridge design according to one of the preceding claims, characterized in that the pump piston (19) with first and second outlet valve (21', 21") forms a piston assembly (35), wherein first and second outlet valve (21', 21") are axially secured radially opposite each other within the pump piston (19) in receiving bores of the armature body (28).
  9. Electromagnetically actuated double-acting piston pump (1) in cartridge design according to one of the preceding claims, characterized in that the first fixed armature (13') with first inlet valve (20') and second fixed armature (13") with second inlet valve (20") each form an identical fixed armature assembly (44), wherein the inlet valves (20', 20") are held radially within the fixed anchors (13', 13") and axially secured.
  10. Electromagnetically actuated double-acting piston pump (1) in cartridge design according to one of the preceding claims, characterized in that the piston pump (1) has a first and second end face and the pump inlet is formed on the first end face and the end face is covered by means of a filter screen (32) and held on the first clamp half (72') via a clip connection.
  11. Electromagnetically actuated double-acting piston pump (1) in cartridge design according to Claim 10 , characterized in that the second end face is sealed to the outside by means of a pump cover 3, wherein the pump cover (3) comprises a plug (4) for electrical contact with first and second busbars (45, 46) for contact with first and second ring coils (12', 12") of the first and second coil assembly (25', 25").
  12. Electromagnetically actuated double-acting piston pump (1) in cartridge design according to Claim 11 , characterized in that the pump cover (3) includes molded mounting tabs with through holes.
  13. System comprising an electromagnetically actuated double-acting reciprocating pump (1) in cartridge design according to one of the preceding claims, and a housing cavity (54) of a system housing of an electric traction drive with electric motor and gearbox unit, wherein the reciprocating pump (1) is arranged in the housing cavity (54) such that a suction and pressure side area is formed, wherein the sealing in the area of the pump outlet (6) in the mounting system (31) is effected via a shell-side sealing surface (73) on a housing wall of the housing cavity and the pump outlet (6) opens into a fluid bore in the housing wall.

Description

The invention relates to an electromagnetically actuated double-acting reciprocating pump in cartridge design for supplying a component of a motor vehicle's drive train with a coolant and/or lubricant, comprising a pump piston axially movable in the direction of a working stroke by an electromagnetic linear drive for displacing and conveying the coolant and/or lubricant, wherein, in the direction of the working stroke, a coil of a solenoid applies an electromagnetic force to the pump piston on both sides, so that the pump piston is electromagnetically actuated on both sides. State of the art Electric traction drives typically use oil pumps driven by brushless DC motors (BLDC motors). These pumps deliver a flow rate that can be adjusted as needed, independent of the vehicle speed, by controlling the BLDC motor's speed. The preferred pump type is a rotary positive displacement pump, specifically a gear pump, also known as a gerotor pump. The pump consists of a gear set with an inner and an outer rotor, and a generally two- or three-part pump housing. While this design is simple and proven, it results in high costs for the motor-pump unit, particularly for the BLDC motor and the necessary commutation electronics for motor control, such as the BLDC driver or the B6 bridge rectifier. If the commutation electronics are not integrated directly at the motor, but rather in a central transmission control unit or the inverter control board of the electric traction motor, additional costs arise for the complex wiring harness and connectors. More cost-effective versions than brushed DC motors can be controlled easily, but due to the sliding contacts they are not wear-free and therefore have a significantly reduced lifespan. Mechanically driven oil pumps, for example via an intermediate shaft in the transmission, have the disadvantage that the achievable flow rate depends on the vehicle speed. Therefore, under certain operating conditions, such as high torque and low vehicle speed, an insufficient flow of cooling oil may not be provided. Furthermore, secondary drives that do not have a mechanical disconnect clutch continuously generate drag power. Especially for applications in electric secondary drives, where, compared to primary applications, only very small proportions of time are required for active operation over the entire vehicle lifetime, and a generally lower cooling oil requirement is demanded, the above-mentioned designs, known according to the state of the art, do not represent an absolutely satisfactory solution when considering cost and efficiency requirements. Furthermore, electromagnetically actuated oscillating piston or diaphragm pumps are already used in other automotive applications. These pumps, generally designed in-line for direct installation, deliver only very low flow rates. They are used as metering pumps for fuel metering in auxiliary heaters and parking heaters, as AdBlue metering pumps, or as fuel metering pumps for exhaust gas temperature management. However, they pump significantly lower-viscosity media, such as diesel or AdBlue, compared to the eDrive oils used in electric drives. Oscillating piston or diaphragm pumps used as metering pumps are generally designed for very small flow rates, and their operation is often audible. Furthermore, reciprocating piston pumps with electromagnetic drives are described, for example, in the publication. DE 4328621 A1 The electromagnetic drive consists of a magnetic coil, magnetic flux-conducting iron components such as the magnetic pole, iron return, and magnetic yoke, as well as an armature attracted by the stationary magnetic pole. The electromagnetic drive acts on a displacement apparatus in which a dynamically sealed piston enters a displacement chamber and displaces working fluid to the outlet. Simultaneously, the volume of a second chamber, connected to the inlet, is altered. The displacement apparatus typically includes at least two valves: an inlet valve connecting the second chamber to the displacement chamber and an outlet valve connecting the displacement chamber to the outlet. After DE 30 27 539 An electromagnetic piston pump is known in which the piston is moved back and forth by magnetic forces generated by electromagnets. A pump is described with a pump housing equipped with electromagnets on both sides and a central section that does not respond to magnetic forces. The piston is made of a material that is attracted to magnetic forces. The piston is moved by alternately switching the electromagnets on and off. A special design is an electromagnet piston pump that exhibits a double pumping action. In the case of the electromagnetic reciprocating piston pump according to the DE 10 2008 055 609 A1 The magnetic armature of the electromagnet, which drives the piston pump, is mounted by means of an armature rod, which simultaneously takes over the function of the displacement piston. Furthermore, a reciprocating piston pump with a fluid-fille