EP2366902B1 - Pumping unit for feeding oil under pressure to a user - Google Patents

Pumping unit for feeding oil under pressure to a user Download PDF

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Publication number
EP2366902B1
EP2366902B1 EP20110158363 EP11158363A EP2366902B1 EP 2366902 B1 EP2366902 B1 EP 2366902B1 EP 20110158363 EP20110158363 EP 20110158363 EP 11158363 A EP11158363 A EP 11158363A EP 2366902 B1 EP2366902 B1 EP 2366902B1
Authority
EP
European Patent Office
Prior art keywords
pump
pumping unit
chamber
user
under pressure
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.)
Active
Application number
EP20110158363
Other languages
German (de)
French (fr)
Other versions
EP2366902A1 (en
Inventor
Bruno Bertagna
Davide Gambetti
Roberto Zambardi
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.)
ZF Automotive Italia SRL
Original Assignee
TRW Automotive Italia SRL
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Publication date
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Publication of EP2366902A1 publication Critical patent/EP2366902A1/en
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Publication of EP2366902B1 publication Critical patent/EP2366902B1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C11/00—Combinations of two or more machines or pumps, each being of rotary-piston or oscillating-piston type; Pumping installations
    • F04C11/005—Combinations of two or more machines or pumps, each being of rotary-piston or oscillating-piston type; Pumping installations of dissimilar working principle
    • F04C11/006—Combinations of two or more machines or pumps, each being of rotary-piston or oscillating-piston type; Pumping installations of dissimilar working principle having complementary function
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/10—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2210/00—Fluid
    • F04C2210/14—Lubricant
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2240/00—Components
    • F04C2240/30—Casings or housings

Definitions

  • the present invention relates to a pumping unit for feeding oil under pressure to a user.
  • the present invention relates to a pumping unit of the type comprising a volumetric pump, preferably a gear pump, having at least one inlet to draw the oil into the pump and at least one outlet to deliver the oil to the user; and a gas accumulator comprising a cylinder and a piston, which is slidingly engaged in the cylinder, and within the cylinder itself, defines a first chamber containing a gas under pressure and a second chamber hydraulically connected to the delivery outlet of the pump by means of a hydraulic duct.
  • a volumetric pump preferably a gear pump, having at least one inlet to draw the oil into the pump and at least one outlet to deliver the oil to the user
  • a gas accumulator comprising a cylinder and a piston, which is slidingly engaged in the cylinder, and within the cylinder itself, defines a first chamber containing a gas under pressure and a second chamber hydraulically connected to the delivery outlet of the pump by means of a hydraulic duct.
  • Feeding the oil under pressure into the second chamber implies the displacement of the piston and the compression of the gas contained in the first chamber, and allows the gas accumulator to accumulate potential energy which will then be returned in the phases of maximum absorption of the user.
  • the pump generally comprises a pump body; a pair of closing lids mounted at the ends of the pump body orthogonally to a longitudinal axis thereof; and a plurality of locking screws distributed around the axis to lock the two lids against the pump body.
  • the known pumping units of the above-described type have several drawbacks, mainly deriving from that these pumping units are relatively cumbersome and expensive due to the presence of the locking screws and of two distinct devices, that is the gas accumulator and the pump, and for each locking screw, entail a hole through each of the two lids and a further hole through the pump body to be made.
  • a pumping unit for feeding oil under pressure to a user as claimed in the appended claims.
  • numeral 1 indicates as a whole a pumping unit for feeding oil under pressure from a containment tank 2 at atmospheric pressure to a user 3 comprising, in this case, a cylinder 4 and a piston 5, which is movable within cylinder 4, and defines two chambers 6, 7 within cylinder 4.
  • Pumping unit 1, tank 2, and user 3 define part of a hydraulic circuit 8 further comprising an over-pressure valve 9, which is mounted between pumping unit 1 and user 3, and is shaped to open when the pressure value of the oil fed to user 3 is substantially equal to a predetermined threshold value, and a solenoid valve 10 movable between a closed position of circuit 8 ( figure 3 ), a first operative position (not shown), in which solenoid valve 10 is arranged so as to allow the pumping unit 1 to feed oil under pressure into chamber 6, and chamber 7 to discharge oil under pressure into tank 2, and a second operative position (not shown), in which solenoid valve 10 is arranged so as to allow the pumping unit 1 to feed oil under pressure into chamber 7, and chamber 6 to discharge oil under pressure into tank 2.
  • Pumping unit 1 is provided with a gas accumulator 11 comprising a cylinder 12, which has a longitudinal axis 13, and comprises in turn a bell-shaped housing 14, which is coaxial to axis 13, is closed at a first end thereof by a bottom wall 15 substantially perpendicular to axis 13, and is closed at a second end thereof by a substantially cylindrical plate 16 arranged perpendicularly to axis 13.
  • a gas accumulator 11 comprising a cylinder 12, which has a longitudinal axis 13, and comprises in turn a bell-shaped housing 14, which is coaxial to axis 13, is closed at a first end thereof by a bottom wall 15 substantially perpendicular to axis 13, and is closed at a second end thereof by a substantially cylindrical plate 16 arranged perpendicularly to axis 13.
  • Accumulator 11 further comprises a piston 17, which is mounted within cylinder 12 coaxially to axis 13, is cup shaped with the concavity facing plate 16, is slidingly coupled to housing 14, and is further fluid-tightly coupled with cylinder 12, by interposing an annular gasket 18 mounted to piston 17 coaxially to axis 13.
  • piston 17 defines a first chamber 19 which is axially closed by wall 15 and contains a gas under pressure therein, e.g. nitrogen, and a second chamber 20 which is axially closed by plate 16 and hydraulically communicates with user 3 through a delivery hole 21 obtained in plate 16.
  • a gas under pressure e.g. nitrogen
  • Plate 16 is fluid-tightly coupled with housing 14 by interposing an annular gasket 22 mounted to plate 16 coaxially to axis 13, is slidingly coupled to housing 14, and is held within cylinder 12 by a stop ring 23 mounted within housing 14 coaxially to axis 13 and on the opposite side of piston 17 with respect to plate 16.
  • Pumping unit 1 further comprises a volumetric pump 24, in this case a gear pump, which is housed within chamber 20, and comprises in turn a pump body 25, which is axially closed on one side by plate 16 and on the other side by a substantially cylindrical lid 26 arranged perpendicularly to axis 13, and is mounted to plate 16 by means of two centring pins (not shown) engaged in respective holes 27 obtained in the plate 16 itself, parallel to axis 13.
  • a volumetric pump 24 in this case a gear pump, which is housed within chamber 20, and comprises in turn a pump body 25, which is axially closed on one side by plate 16 and on the other side by a substantially cylindrical lid 26 arranged perpendicularly to axis 13, and is mounted to plate 16 by means of two centring pins (not shown) engaged in respective holes 27 obtained in the plate 16 itself, parallel to axis 13.
  • Pump body 25 hydraulically communicates with tank 2 through a suction hole 28 obtained through plate 16, and hydraulically communicates with chamber 20 through a delivery hole 29 which is obtained, in this case, through lid 26, and cooperates with a check valve 30 ( figure 3 ) adapted to prevent the oil under pressure from returning into the pump body 25.
  • Pump 24 further comprises an inlet shaft 31, which has a longitudinal axis 32 parallel to axis 13, and extends through plate 16; and a waved spring 33, which is substantially U-shaped, extends about lid 26, and is secured to the lid 26 itself.
  • piston 17 When pump 24 is off, piston 17 is displaced, and normally held, by the gas under pressure contained in chamber 19 in a locking position ( figure 2 ), in which piston 17 is arranged in contact with a stop ring 34 mounted between plate 16 and piston 17, coaxially to axis 13, and is further arranged in contact with lid 26 by interposing spring 33 to lock pump body 25 and lid 26 against plate 16.
  • chamber 20 Upon activating pump 24 and closing solenoid valve 10, chamber 20 is filled with the oil under pressure fed through the delivery hole 29.
  • piston 17 When the pressure of the oil contained in chamber 20 is higher than the pressure of the gas contained in chamber 19, piston 17 is displaced towards wall 15 from its locking position, so as to reduce the volume of chamber 19, compress the gas contained in chamber 19, and allow accumulator 11 to accumulate potential energy which will then be returned to the hydraulic circuit 8 in the maximum absorption phases of user 3.
  • pump 24 is hydraulically connected in series with chamber 20 and user 3, and assembling pump 24 within chamber 20 allows:

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)
  • Details Of Reciprocating Pumps (AREA)
  • Rotary Pumps (AREA)

Description

  • The present invention relates to a pumping unit for feeding oil under pressure to a user.
  • Document US 3 496 879 is considered to represent the closest prior art.
  • In particular, the present invention relates to a pumping unit of the type comprising a volumetric pump, preferably a gear pump, having at least one inlet to draw the oil into the pump and at least one outlet to deliver the oil to the user; and a gas accumulator comprising a cylinder and a piston, which is slidingly engaged in the cylinder, and within the cylinder itself, defines a first chamber containing a gas under pressure and a second chamber hydraulically connected to the delivery outlet of the pump by means of a hydraulic duct.
  • Feeding the oil under pressure into the second chamber implies the displacement of the piston and the compression of the gas contained in the first chamber, and allows the gas accumulator to accumulate potential energy which will then be returned in the phases of maximum absorption of the user.
  • The pump generally comprises a pump body; a pair of closing lids mounted at the ends of the pump body orthogonally to a longitudinal axis thereof; and a plurality of locking screws distributed around the axis to lock the two lids against the pump body.
  • The known pumping units of the above-described type have several drawbacks, mainly deriving from that these pumping units are relatively cumbersome and expensive due to the presence of the locking screws and of two distinct devices, that is the gas accumulator and the pump, and for each locking screw, entail a hole through each of the two lids and a further hole through the pump body to be made.
  • It is an object of the present invention to provide a pumping unit for feeding oil under pressure to a user which is free from the above-described drawbacks, and simple and cost-effective to be implemented.
  • According to the present invention, there is provided a pumping unit for feeding oil under pressure to a user as claimed in the appended claims.
  • The present invention will now be described with reference to the accompanying drawings, which illustrate a non-limiting embodiment thereof by way of example, in which:
    • figure 1 is an exploded perspective view of a preferred embodiment of the pumping unit according to the present invention;
    • figure 2 is a longitudinal section of the pumping unit in figure 1; and
    • figure 3 schematically illustrates a hydraulic circuit provided with the pumping unit in figures 1 and 2.
  • With reference to figures 1, 2 and 3, numeral 1 indicates as a whole a pumping unit for feeding oil under pressure from a containment tank 2 at atmospheric pressure to a user 3 comprising, in this case, a cylinder 4 and a piston 5, which is movable within cylinder 4, and defines two chambers 6, 7 within cylinder 4.
  • Pumping unit 1, tank 2, and user 3 define part of a hydraulic circuit 8 further comprising an over-pressure valve 9, which is mounted between pumping unit 1 and user 3, and is shaped to open when the pressure value of the oil fed to user 3 is substantially equal to a predetermined threshold value, and a solenoid valve 10 movable between a closed position of circuit 8 (figure 3), a first operative position (not shown), in which solenoid valve 10 is arranged so as to allow the pumping unit 1 to feed oil under pressure into chamber 6, and chamber 7 to discharge oil under pressure into tank 2, and a second operative position (not shown), in which solenoid valve 10 is arranged so as to allow the pumping unit 1 to feed oil under pressure into chamber 7, and chamber 6 to discharge oil under pressure into tank 2.
  • Pumping unit 1 is provided with a gas accumulator 11 comprising a cylinder 12, which has a longitudinal axis 13, and comprises in turn a bell-shaped housing 14, which is coaxial to axis 13, is closed at a first end thereof by a bottom wall 15 substantially perpendicular to axis 13, and is closed at a second end thereof by a substantially cylindrical plate 16 arranged perpendicularly to axis 13.
  • Accumulator 11 further comprises a piston 17, which is mounted within cylinder 12 coaxially to axis 13, is cup shaped with the concavity facing plate 16, is slidingly coupled to housing 14, and is further fluid-tightly coupled with cylinder 12, by interposing an annular gasket 18 mounted to piston 17 coaxially to axis 13.
  • Within cylinder 12, piston 17 defines a first chamber 19 which is axially closed by wall 15 and contains a gas under pressure therein, e.g. nitrogen, and a second chamber 20 which is axially closed by plate 16 and hydraulically communicates with user 3 through a delivery hole 21 obtained in plate 16.
  • Plate 16 is fluid-tightly coupled with housing 14 by interposing an annular gasket 22 mounted to plate 16 coaxially to axis 13, is slidingly coupled to housing 14, and is held within cylinder 12 by a stop ring 23 mounted within housing 14 coaxially to axis 13 and on the opposite side of piston 17 with respect to plate 16.
  • Pumping unit 1 further comprises a volumetric pump 24, in this case a gear pump, which is housed within chamber 20, and comprises in turn a pump body 25, which is axially closed on one side by plate 16 and on the other side by a substantially cylindrical lid 26 arranged perpendicularly to axis 13, and is mounted to plate 16 by means of two centring pins (not shown) engaged in respective holes 27 obtained in the plate 16 itself, parallel to axis 13.
  • Pump body 25 hydraulically communicates with tank 2 through a suction hole 28 obtained through plate 16, and hydraulically communicates with chamber 20 through a delivery hole 29 which is obtained, in this case, through lid 26, and cooperates with a check valve 30 (figure 3) adapted to prevent the oil under pressure from returning into the pump body 25.
  • Pump 24 further comprises an inlet shaft 31, which has a longitudinal axis 32 parallel to axis 13, and extends through plate 16; and a waved spring 33, which is substantially U-shaped, extends about lid 26, and is secured to the lid 26 itself.
  • When pump 24 is off, piston 17 is displaced, and normally held, by the gas under pressure contained in chamber 19 in a locking position (figure 2), in which piston 17 is arranged in contact with a stop ring 34 mounted between plate 16 and piston 17, coaxially to axis 13, and is further arranged in contact with lid 26 by interposing spring 33 to lock pump body 25 and lid 26 against plate 16.
  • Upon activating pump 24 and closing solenoid valve 10, chamber 20 is filled with the oil under pressure fed through the delivery hole 29. When the pressure of the oil contained in chamber 20 is higher than the pressure of the gas contained in chamber 19, piston 17 is displaced towards wall 15 from its locking position, so as to reduce the volume of chamber 19, compress the gas contained in chamber 19, and allow accumulator 11 to accumulate potential energy which will then be returned to the hydraulic circuit 8 in the maximum absorption phases of user 3.
  • Since the cross-section available to the oil within pump body 25 is smaller than the surface of lid 26, the force exerted on lid 26 by the oil contained in chamber 20 is greater than the force exerted on lid 26 by the oil contained in pump body 25, and therefore it ensures pump body 25 and lid 26 to be locked against plate 16.
  • From the above description, pump 24 is hydraulically connected in series with chamber 20 and user 3, and assembling pump 24 within chamber 20 allows:
    • a pumping unit 1 which is relatively simple, compact and cost-effective to be implemented;
    • pump body 25 and lid 26 to be simply locked against plate 16 by means of piston 17 when pump 24 is off and by means of the oil under pressure fed into chamber 20 when pump 24 is on; and
    • using locking screws and making corresponding holes through plate 16, pump body 25, and lid 26 to be avoided, with the consequent reduction of friction inside pump 24 and the performance increase of pump 24.
  • Furthermore, the combination of oil under pressure within chamber 20 and gas under pressure within chamber 19 increases the capacity of pumping unit 1 to reduce both the pressure pulsations along the hydraulic circuit 8 and the irregularities in the flow of oil under pressure fed to user 3.

Claims (8)

  1. A pumping unit for feeding oil under pressure to a user (3), the pumping unit comprising a pump (24) having at least one suction inlet (28) for the oil into the pump (24) and at least one delivery outlet (29) for the oil to the user (3); and a gas accumulator (11) comprising a cylinder (12) and a piston (17), which is slidingly engaged in the cylinder (12), and defines within the cylinder (12) a first chamber (19) containing a gas under pressure and a second chamber (20) hydraulically connected with the delivery outlet (29) of the pump (24); and being characterised in that the pump (24) is housed within the second chamber (20); the pump (24), the second chamber (20), and the user (3) being hydraulically connected in series to one another.
  2. Pumping unit according to claim 1, wherein the cylinder (12) comprises a closing header (16) of the second chamber (20); the pump (24) comprising a pump body (25) arranged between the header (16) and a closing lid (26) of the pump body (25).
  3. Pumping unit according to claim 2, wherein the cylinder (12) further comprises stop means (34) adapted to stop the piston (17) in a locking position of the lid (26) and of the body pump (25) against the header (16).
  4. Pumping unit according to claim 3, wherein the pump (24) further comprises a waved spring (33) mounted on the lid (26); the piston (17) being arranged in contact with the lid (26) with the interposition of the waved spring (33) upon its displacement in said locking position.
  5. Pumping unit according to any of claims 2 to 4, wherein each suction inlet (28) is obtained through the header (16).
  6. Pumping unit according to any of claims 2 to 5, wherein the gas accumulator (11) comprises a further delivery outlet (21), which is hydraulically connected with the user (3), and is provided through the cylinder (12) at the second chamber (20).
  7. Pumping unit according to any of claims 2 to 6, wherein the pump (24) has an inlet shaft (31) extending through said header (16).
  8. Pumping unit according to any of the preceding claims and further comprising a check valve (30) arranged at said delivery outlet (29).
EP20110158363 2010-03-15 2011-03-15 Pumping unit for feeding oil under pressure to a user Active EP2366902B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITBO2010A000156A IT1399308B1 (en) 2010-03-15 2010-03-15 PUMPING GROUP TO SUPPLY OIL IN PRESSURE TO A USER

Publications (2)

Publication Number Publication Date
EP2366902A1 EP2366902A1 (en) 2011-09-21
EP2366902B1 true EP2366902B1 (en) 2015-01-07

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP20110158363 Active EP2366902B1 (en) 2010-03-15 2011-03-15 Pumping unit for feeding oil under pressure to a user

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EP (1) EP2366902B1 (en)
IT (1) IT1399308B1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110498070A (en) * 2019-09-16 2019-11-26 四川省星达机器人有限公司 Thick liquid fills the sealing of packet hopper and admission gear

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3496879A (en) * 1968-01-10 1970-02-24 Gen Motors Corp Fluid pump with plural accumulators
DE2151715A1 (en) * 1971-10-18 1973-04-26 Kloeckner Humboldt Deutz Ag SELF-REGULATING PISTON PUMP

Also Published As

Publication number Publication date
ITBO20100156A1 (en) 2011-09-16
EP2366902A1 (en) 2011-09-21
IT1399308B1 (en) 2013-04-16

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