WO2007138633A1 - Pompe à piston volumétrique pour lubrification - Google Patents

Pompe à piston volumétrique pour lubrification Download PDF

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Publication number
WO2007138633A1
WO2007138633A1 PCT/IT2007/000368 IT2007000368W WO2007138633A1 WO 2007138633 A1 WO2007138633 A1 WO 2007138633A1 IT 2007000368 W IT2007000368 W IT 2007000368W WO 2007138633 A1 WO2007138633 A1 WO 2007138633A1
Authority
WO
WIPO (PCT)
Prior art keywords
positive displacement
lubricant
piston pump
pump according
cylinder body
Prior art date
Application number
PCT/IT2007/000368
Other languages
English (en)
Inventor
Andrea Di Foggia
Mariano Migliaccio
Ottavio Pennacchia
Original Assignee
La.Me. S.R.L.
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 La.Me. S.R.L. filed Critical La.Me. S.R.L.
Priority to CA002652914A priority Critical patent/CA2652914A1/fr
Priority to US12/302,526 priority patent/US20090191075A1/en
Priority to EP07790100A priority patent/EP2032855A1/fr
Publication of WO2007138633A1 publication Critical patent/WO2007138633A1/fr

Links

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
    • F04B23/00—Pumping installations or systems
    • F04B23/02—Pumping installations or systems having reservoirs
    • F04B23/021—Pumping installations or systems having reservoirs the pump being immersed in the reservoir
    • F04B23/023—Pumping installations or systems having reservoirs the pump being immersed in the reservoir only the pump-part being immersed, the driving-part being outside the reservoir

Definitions

  • the device of the present invention is applicable, although not exclusively, to the field relating to the lubrication of mechanical components of reciprocating compressors and of small-sized internal combustion engines.
  • lubrication systems are required that are capable of handling even very modest lubricant flow rates and to supply them to the required points; moreover, said systems should have a simple mechanics, be realizable at low cost, and be able to utilise the motion provided by the machine on which they are mounted, without resorting to unduly complicated mechanisms (like additional small shafts, power takeoffs. etc.).
  • lubrication in small-sized piston engines and in reciprocating compressors is performed substantially either by splash lubrication, in case this method is considered satisfactory, or by employing gear pumps, in case the needs of a good lubrication are more pressing.
  • mechanically actuated usually by a cam
  • small-sized, positive displacement pumps have also been developed, as well as electromagnetically controlled valves, specifically for small internal combustion motors of motorcycles or scooters.
  • Splash lubrication which relies on the splashing and agitation caused by the very components to be lubricated (which are wetted by the oil generally contained inside an oil sump), has the advantage to be extremely economical and simple, provided it is able to insure a sufficient lubrication.
  • the lubrication relying on gear pumps has the advantage of putting under pressure the lubrication circuit and of allowing to accurately reach the various points or areas to be lubricated, with the required oil flow rate and the correct (prescribed) pressure value.
  • the lubricant also has the not negligible task of cooling the surfaces which are in mutual contact.
  • cam-actuated positive displacement pumps has quickly become widespread, besides that of electromagnetic pumps, in the field of small-sized internal combustion engines and in the technical field of compressors, due to the possibility of feeding the lubricant under pressure, by controlling the flow rates, and therefore, taking advantage of the possibility of cooling down the various lubricated kinematical couples.
  • FIGURE 1 shows the first embodiment of the needle-shaped positive displacement pump according to the present invention
  • FIGURES 2a and 2b are two orthogonal views of the second embodiment of the needle-shaped positive displacement pump according to the present invention.
  • FIGURES 3a and 3b are two orthogonal views of the third embodiment of needle shaped positive displacement pump according to the present invention.
  • the present invention suggests a valid alternative to conventionally used arrangements in the field of lubrication systems for small-sized, internal combustion motors, and for positive displacement compressors.
  • it consists of a piston pump whose structure, however, is such as to permit to put under pressure the lubricant taken from the oil sump, wherein, the free, upper surface of the oil level may also be located far away from the rotating members of the machine.
  • Fig. 1 shows a schematic cross-section of a possible embodiment of the present invention, formed by: a cylinder body 1 ;
  • the piston 2 Starting from the bottom dead centre (BDC), the piston 2, while moving upwards, generates a negative pressure inside the cylinder 1 , which is due to the fact that there is no fluid communication to the outside environment, because the suction inlet 10 remains closed (obstructed) by the piston 2 itself, while the delivery is controlled by the check valve 3.
  • the piston 2 opens the suction inlet (suction opening) 10 obtained in the cylinder 1 , lubricant is sucked through the suction inlet 4 immersed in the lubricant (this system is self-starting or "self-priming" provided the negative pressure obtained inside the cylinder 1 insures the lifting of the liquid from the free, upper surface level, up to the suction opening 10).
  • the piston 2 Upon reaching the top dead centre (TDC), the piston 2 inverts its direction of motion; there will be a first phase of backflow of lubricant through the suction inlet, but then, after the piston 2 has closed this inlet 10, the delivery phase starts, after the opening of the check valve 3 under the pressure force exerted by the compressed lubricant - on this check valve 3 -, which overcomes the closure force of the spring 11 of the valve 3.
  • the lubricant first flows past the check valve 3 and then through a cavity obtained in the piston 2, until it reaches a delivery region.
  • the plug 6 exerts a backing function (abutment) on the closure spring 11 of the check valve 3.
  • the flow rate (delivery or capacity) of the pump of the invention can be modified by selecting an adequate cylinder bore or a suitable stroke (eccentricity of the hole on the crank).
  • FIG. 2 there is shown a further version (embodiment) of the small pump according to the present invention, that will be named "B-version".
  • This system comprises: a cylinder body 1 ' ;
  • Fig 2 (a and b)
  • the operation of the system illustrated in Fig 2 (a and b) is basically the same as that of the device named "A- version", with the only difference that the lubricant is now compressed inside a cylinder body 1', which is substantially completely dipped (immersed) in the lubricant, while it is supplied to the delivery region through an additional element forming essentially a small hose 4'.
  • the operation is detailed in the following paragraph:
  • the crank 7' while rotating around its axis, brings about a relative motion between the piston 2' (hinged on the eccentric bore 9' of the crank; X-axis) and the cylinder body 1', the latter being hinged (at 15') to the oil sump (not shown).
  • the resulting motion is a classical reciprocating motion of a conventional crank mechanism whose stroke is twice the distance existing between the axis of the crank T and the axis X of the eccentric bore 9' of the crank T.
  • the piston 2' Starting from the BDC, the piston 2', in the course of its upward motion, generates a negative pressure inside the cylinder 1 ' which is due to the fact that there is no fluid communication to the outside because the suction inlet (analogous to 10 of Fig.
  • the piston 2' Upon arriving at the TDC (top dead centre) the piston 2' inverts its direction of motion; there will be a first phase of backflow through the suction inlet, and then the delivery phase will start after the piston 2' has closed said inlet and the check valve 3' has opened under the pressure force exerted - on this check valve 3' - by the compressed lubricant, this pressure force overcoming the closing force of the spring (not shown in Fig. 2) of the valve 3'.
  • This system may be equipped with a pressure-relief valve 8'.
  • the system includes:

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)
  • Compressor (AREA)

Abstract

L'invention concerne une pompe volumétrique dont la structure permet d'augmenter la pression du lubrifiant provenant du carter d'huile, la surface de niveau libre du lubrifiant pouvant même être située à distance des éléments rotatifs de la machine. Cela s'applique spécifiquement à des compresseurs d'air alternatifs comprenant généralement un carter d'huile situé à grande distance de l'arbre d'entraînement utilisé pour transmettre le mouvement requis pour l'actionnement de la pompe. Ladite pompe est basée sur un mécanisme de manivelle (7, 7', 7'; 13; 13') qui aspire le lubrifiant et le distribue sous pression, de manière orientée vers la cible, aux composants nécessitant une lubrification.
PCT/IT2007/000368 2006-05-31 2007-05-28 Pompe à piston volumétrique pour lubrification WO2007138633A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CA002652914A CA2652914A1 (fr) 2006-05-31 2007-05-28 Pompe a piston volumetrique pour lubrification
US12/302,526 US20090191075A1 (en) 2006-05-31 2007-05-28 Positive displacement piston pump, for lubication
EP07790100A EP2032855A1 (fr) 2006-05-31 2007-05-28 Pompe à piston volumétrique pour lubrification

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT000068A ITNA20060068A1 (it) 2006-05-31 2006-05-31 "pompa volumetrica alternativa a spillo per utilizzo in piccoli motori alternativi a combustione interna e in compressori volumetrici alternativi".
ITNA2006A000068 2006-05-31

Publications (1)

Publication Number Publication Date
WO2007138633A1 true WO2007138633A1 (fr) 2007-12-06

Family

ID=38596340

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IT2007/000368 WO2007138633A1 (fr) 2006-05-31 2007-05-28 Pompe à piston volumétrique pour lubrification

Country Status (5)

Country Link
US (1) US20090191075A1 (fr)
EP (1) EP2032855A1 (fr)
CA (1) CA2652914A1 (fr)
IT (1) ITNA20060068A1 (fr)
WO (1) WO2007138633A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1858036A (en) * 1929-08-01 1932-05-10 Better Built Pumps Inc Pump
GB576549A (en) 1944-10-03 1946-04-09 Uni Gun Lubricating Equipment Improvements in or relating to reciprocating pumps
US4047845A (en) * 1975-12-22 1977-09-13 Auto Research Corporation Cyclic pump
US5894830A (en) * 1997-12-15 1999-04-20 Caterpillar Inc. Engine having a high pressure hydraulic system and low pressure lubricating system
US6364639B1 (en) * 1998-09-11 2002-04-02 Lincoln Industrial Corporation Pump

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1858036A (en) * 1929-08-01 1932-05-10 Better Built Pumps Inc Pump
GB576549A (en) 1944-10-03 1946-04-09 Uni Gun Lubricating Equipment Improvements in or relating to reciprocating pumps
US4047845A (en) * 1975-12-22 1977-09-13 Auto Research Corporation Cyclic pump
US5894830A (en) * 1997-12-15 1999-04-20 Caterpillar Inc. Engine having a high pressure hydraulic system and low pressure lubricating system
US6364639B1 (en) * 1998-09-11 2002-04-02 Lincoln Industrial Corporation Pump

Also Published As

Publication number Publication date
EP2032855A1 (fr) 2009-03-11
US20090191075A1 (en) 2009-07-30
CA2652914A1 (fr) 2007-12-06
ITNA20060068A1 (it) 2007-12-01

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