US20040166002A1 - Axial piston pump driven by an electric motor - Google Patents

Axial piston pump driven by an electric motor Download PDF

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Publication number
US20040166002A1
US20040166002A1 US10/779,701 US77970104A US2004166002A1 US 20040166002 A1 US20040166002 A1 US 20040166002A1 US 77970104 A US77970104 A US 77970104A US 2004166002 A1 US2004166002 A1 US 2004166002A1
Authority
US
United States
Prior art keywords
casing
electric motor
pump
axial piston
piston pump
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.)
Abandoned
Application number
US10/779,701
Other languages
English (en)
Inventor
Giancarlo Lanfredi
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.)
Lavorwash SpA
Original Assignee
Lavorwash SpA
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 Lavorwash SpA filed Critical Lavorwash SpA
Assigned to LAVORWASH S.P.A. reassignment LAVORWASH S.P.A. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: LANFREDI, GIANCARLO
Publication of US20040166002A1 publication Critical patent/US20040166002A1/en
Abandoned legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
    • F04B1/128—Driving means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
    • F04B1/14—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis having stationary cylinders
    • F04B1/141—Details or component parts
    • F04B1/145—Housings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
    • F04B17/03—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B27/00—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders
    • F04B27/08—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders coaxial with, or parallel or inclined to, main shaft axis
    • F04B27/10—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders coaxial with, or parallel or inclined to, main shaft axis having stationary cylinders
    • F04B27/1036—Component parts, details, e.g. sealings, lubrication
    • F04B27/1081—Casings, housings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2225/00—Synthetic polymers, e.g. plastics; Rubber

Definitions

  • the present invention relates to a hydraulic axial piston pump driven by an electric motor.
  • the pump is constituted by an outer casing in which the cylinder block is arranged in alignment with the rotation axis of the pivot on which the oscillating swash plate is keyed.
  • the pivot of the oscillating swash plate protrudes from the casing and a crown gear is keyed on its outer part and meshes with a pinion that is functionally connected to the electric motor of the pump.
  • the electric motor is fixed to a flange, which is connected to a corresponding flange that is formed monolithically with the casing; the space for the crown gear and the pinion is formed between the two flanges.
  • Fitting the motor flange to the casing flange is troublesome as regards both to the double fixing operation (motor flange to motor and subsequent fixing to the casing flange) and the correct positioning of the components between the two flanges; during the assembly of these components it is in fact necessary to try to reduce the concentricity errors that are produced during mutual coupling.
  • these flanges are typically made of metallic material and accordingly increase significantly the total weight of the device in which they are included, particularly if said device has a structure made of plastics.
  • the aim of the present invention is to provide a hydraulic axial piston pump driven by an electric motor that solves the problems described above in known types.
  • an object of the present invention is to provide a hydraulic axial piston pump driven by an electric motor that simplifies the coupling of the electric motor to the casing.
  • Another object of the present invention is to provide a hydraulic axial piston pump driven by an electric motor that reduces the concentricity errors generated in coupling the components of the pump and reduces the rotating masses.
  • Another object of the present invention is to provide a hydraulic axial piston pump driven by an electric motor that can be manufactured at a lower cost than currently manufactured pumps.
  • Another object of the present invention is to provide a hydraulic axial piston pump driven by an electric motor that is lighter than currently manufactured pumps.
  • Another object of the present invention is to provide a hydraulic axial piston pump driven by an electric motor that can be manufactured with known equipment and technologies.
  • a hydraulic axial piston pump driven by an electric motor characterized in that it comprises an outer casing that is formed monolithically with elements for fixing said casing to the stator assembly of the electric motor, said electric motor being thus coupled directly to said casing.
  • FIG. 1 is a partially sectional plan view of an electric motor coupled to a casing of a pump according to the invention
  • FIG. 2 is a front view of the pump casing according to the invention, to which an electric motor is coupled;
  • FIG. 3 is a partially sectional side view of a portion of a pump according to the invention, illustrating in particular the casing of the pump;
  • FIG. 4 is an exploded view of a portion of the pump according to the invention, illustrating in particular the motor, the casing and the components inside the casing.
  • a hydraulic axial piston pump driven by an electric motor is generally designated by the reference numeral 10 .
  • Said pump comprises a casing 11 inside which an oscillating swash plate 11 a is accommodated.
  • the swash plate 11 a is formed by a rotating disk-like body 10 a on which a central hub 12 is formed.
  • the central hub 12 has an axial through hole for coupling to a rotation pivot 13 that is hinged with respect to the casing 11 .
  • the disk-like body 10 a has an annular seat 14 that is inclined with respect to the rotation axis of said disk-like body.
  • the pistons 20 are inserted slidingly in a cylinder block 20 a , which is fixed to the casing 11 by means of brackets, and are associated with return springs 20 b.
  • Said sliding means are constituted by a first thrust bearing 16 on which a roller cage 17 rests; in turn, a second thrust bearing 18 rests on the roller cage 17 and is directly in contact with the heads 19 of the pistons 20 .
  • the swash plate 11 a comprises, on the peripheral region of the disk-like body 10 a , which is formed monolithically therewith, a toothed circumferential portion 21 that is coaxial to the rotation axis of the swash plate 11 a.
  • the toothed circumferential portion 21 is kinematically coupled to an actuation gear 22 , for example a pinion, which is functionally connected to an electric motor 23 of the pump by way of an output shaft 24 of said electric motor; the shaft 24 supports said pinion at its end and is keyed directly to the casing 11 .
  • an actuation gear 22 for example a pinion, which is functionally connected to an electric motor 23 of the pump by way of an output shaft 24 of said electric motor; the shaft 24 supports said pinion at its end and is keyed directly to the casing 11 .
  • the outer casing 11 is formed monolithically with elements 25 for fixing said casing to a stator assembly 26 of the electric motor 23 .
  • the fixing elements 25 are constituted by first complementarily threaded bores 27 , which are formed along the front peripheral region of the casing 11 and are arranged coaxially to corresponding second complementarily threaded holes 28 , which are formed parallel to the rotation axis of the electric motor 23 on the stator assembly 26 ; in particular, the complementarily threaded holes 28 are formed through the lamination pack of the stator assembly 26 .
  • Corresponding threaded elements 29 for connection between the motor 23 and the casing 11 are arranged through the bores 27 and the complementarily threaded holes 28 .
  • Said threaded elements are constituted for example by a self-tapping screw.
  • the casing 11 is preferably made of plastics.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Details Of Reciprocating Pumps (AREA)
  • Reciprocating Pumps (AREA)
  • Hydraulic Motors (AREA)
  • Braking Systems And Boosters (AREA)
US10/779,701 2003-02-25 2004-02-18 Axial piston pump driven by an electric motor Abandoned US20040166002A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT000012U ITPD20030012U1 (it) 2003-02-25 2003-02-25 Pompa a pistoni assiali azionata mediante un motore elettrico
ITPD2003U000012 2003-02-25

Publications (1)

Publication Number Publication Date
US20040166002A1 true US20040166002A1 (en) 2004-08-26

Family

ID=32866074

Family Applications (1)

Application Number Title Priority Date Filing Date
US10/779,701 Abandoned US20040166002A1 (en) 2003-02-25 2004-02-18 Axial piston pump driven by an electric motor

Country Status (3)

Country Link
US (1) US20040166002A1 (it)
EP (1) EP1457675A3 (it)
IT (1) ITPD20030012U1 (it)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008009246A1 (de) * 2008-02-07 2009-08-13 Alfred Kärcher Gmbh & Co. Kg Hochdruckreinigungsgerät
US20100166581A1 (en) * 2006-04-05 2010-07-01 Lincoln Gmbh Lubricant or hydraulic pump
KR20140111674A (ko) * 2012-01-11 2014-09-19 콘티넨탈 테베스 아게 운트 코. 오하게 유압 유닛
US10677207B2 (en) 2016-05-13 2020-06-09 Rolls-Royce Plc Axial piston pump having a piston housing having fixed field members mounted thereto and interacting with a stator surrounding the housing and configured to generate a force which urges the housing in an axial direction

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5215443A (en) * 1990-09-28 1993-06-01 Speck-Kolbenpumpenfabrik Otto Speck Gmbh & Co. Kg High pressure liquid pump
US5854522A (en) * 1996-06-28 1998-12-29 Mitsuba Corporation Electric motor for driving a piston pump and method of assembly
US6257843B1 (en) * 2000-04-26 2001-07-10 Pumptec, Inc. Self-aligning double-acting simplex plunger pump
US6260582B1 (en) * 1997-04-18 2001-07-17 Continental Teves Ag & Co., Ohg Motor-driven unit
US6499970B1 (en) * 1996-08-09 2002-12-31 Robert Bosch Gmbh Pump unit for a vehicle brake system

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB675754A (en) * 1948-04-06 1952-07-16 John Gane Shirley Barrow Improvements in or relating to reciprocating pumps
GB9704678D0 (en) * 1997-03-06 1997-04-23 Fenner Co Ltd J H Improvements in and relating to hydraulic pumps and motors

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5215443A (en) * 1990-09-28 1993-06-01 Speck-Kolbenpumpenfabrik Otto Speck Gmbh & Co. Kg High pressure liquid pump
US5854522A (en) * 1996-06-28 1998-12-29 Mitsuba Corporation Electric motor for driving a piston pump and method of assembly
US6499970B1 (en) * 1996-08-09 2002-12-31 Robert Bosch Gmbh Pump unit for a vehicle brake system
US6260582B1 (en) * 1997-04-18 2001-07-17 Continental Teves Ag & Co., Ohg Motor-driven unit
US6257843B1 (en) * 2000-04-26 2001-07-10 Pumptec, Inc. Self-aligning double-acting simplex plunger pump

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100166581A1 (en) * 2006-04-05 2010-07-01 Lincoln Gmbh Lubricant or hydraulic pump
US8348631B2 (en) * 2006-04-05 2013-01-08 Lincoln Gmbh Lubricant or hydraulic pump
DE102008009246A1 (de) * 2008-02-07 2009-08-13 Alfred Kärcher Gmbh & Co. Kg Hochdruckreinigungsgerät
KR20140111674A (ko) * 2012-01-11 2014-09-19 콘티넨탈 테베스 아게 운트 코. 오하게 유압 유닛
US20150004023A1 (en) * 2012-01-11 2015-01-01 Continental Teves Ag & Co. Ohg Hydraulic unit
US9989071B2 (en) * 2012-01-11 2018-06-05 Continental Teves Ag & Co. Ohg Fastener arrangement for hydraulic unit
KR102006514B1 (ko) * 2012-01-11 2019-08-01 콘티넨탈 테베스 아게 운트 코. 오하게 유압 유닛
US10677207B2 (en) 2016-05-13 2020-06-09 Rolls-Royce Plc Axial piston pump having a piston housing having fixed field members mounted thereto and interacting with a stator surrounding the housing and configured to generate a force which urges the housing in an axial direction

Also Published As

Publication number Publication date
EP1457675A3 (en) 2004-10-13
EP1457675A2 (en) 2004-09-15
ITPD20030012U1 (it) 2004-08-26

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Legal Events

Date Code Title Description
AS Assignment

Owner name: LAVORWASH S.P.A., ITALY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:LANFREDI, GIANCARLO;REEL/FRAME:014998/0996

Effective date: 20040209

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION