CH335947A - Gear pump of a variable ratio power transmission device - Google Patents

Gear pump of a variable ratio power transmission device

Info

Publication number
CH335947A
CH335947A CH335947DA CH335947A CH 335947 A CH335947 A CH 335947A CH 335947D A CH335947D A CH 335947DA CH 335947 A CH335947 A CH 335947A
Authority
CH
Switzerland
Prior art keywords
gear pump
variable ratio
power transmission
transmission device
ratio power
Prior art date
Application number
Other languages
French (fr)
Inventor
Frederick Hobbs Howard
Hepburn Allen Anthony Rex
Original Assignee
Hobbs Transmission Limited
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 Hobbs Transmission Limited filed Critical Hobbs Transmission Limited
Publication of CH335947A publication Critical patent/CH335947A/en

Links

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
    • 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
    • F04C2/12—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
    • F04C2/14—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
    • 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
    • F04C2/082—Details specially related to intermeshing engagement type machines or pumps
    • F04C2/086—Carter

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)
  • Rotary Pumps (AREA)

Description

  

  Pompe à engrenages     d'un    appareil de     transmission          d'énergie    à rapport     variable       La présente invention a pour objet une pompe à  engrenages d'un appareil de transmission d'énergie  à rapport variable destinée à fournir du liquide sous  pression en vue     d'effectuer    l'engagement d'au moins  un dispositif à friction dans cet appareil, par exemple  un embrayage et/ou un frein.  



  La pompe selon l'invention est caractérisée en ce  qu'elle comporte une conduite d'aspiration pourvue  d'orifices d'admission ménagés dans la paroi de la  conduite à proximité de son extrémité, laquelle est  fermée, la somme des aires des orifices étant plus  petite que l'aire de section transversale de la con  duite.  



  La figure unique du dessin annexé représente, en  coupe, à titre d'exemple, une forme d'exécution de  la pompe faisant l'objet de la présente invention.  



  La pompe représentée comprend un carter 10  contenant une paire de rotors dentés 11 et 12 en  grenant l'un avec l'autre et aspirant du liquide à tra  vers une conduite d'aspiration 13 pour l'évacuer dans  une conduite de sortie 14. L'extrémité de la con  duite 13 est fermée par une paroi 15 et cette paroi  se trouve normalement près de la base d'un carter  ou autre récipient contenant de l'huile. Quatre orifices  16 sont pratiqués dans le côté de la conduite à proxi  mité de la paroi 15. On peut prévoir plus de quatre  trous de dimension correspondante plus petite.

      La somme des aires de ces orifices est plus petite  que l'aire de la section transversale de la conduite  d'aspiration de façon à obtenir, à partir d'une cer  taine vitesse de rotation de la pompe une vitesse de  passage du liquide traversant ces orifices laquelle  dépasse toujours 1,8 m à la seconde de manière à  maintenir une chute de pression minimum, par  exemple de 0,08     kg/cm2    ou au moins 0,07     kg/cm2     à travers les orifices, c'est-à-dire entre la pression  à l'extérieur de la conduite 13 et la pression dans  cette conduite.  



  Des moyens     commandés    manuellement ou auto  matiquement peuvent être prévus pour faire varier  la dimension effective des orifices de manière à four  nir une petite aire à de     faibles    vitesses et une     aire     plus grande à des vitesses croissantes, de manière  à ne pas restreindre indûment le débit de la pompe  à des vitesses plus élevées.



  Gear pump of a variable ratio power transmission apparatus The present invention relates to a gear pump of a variable ratio power transmission apparatus for supplying liquid under pressure in order to perform the 'engagement of at least one friction device in this device, for example a clutch and / or a brake.



  The pump according to the invention is characterized in that it comprises a suction pipe provided with inlet openings formed in the wall of the pipe near its end, which is closed, the sum of the areas of the orifices being smaller than the cross-sectional area of the pipe.



  The single figure of the appended drawing shows, in section, by way of example, an embodiment of the pump forming the subject of the present invention.



  The pump shown comprises a casing 10 containing a pair of toothed rotors 11 and 12 meshing with each other and sucking liquid through a suction line 13 to discharge it into an outlet line 14. L The end of the duct 13 is closed by a wall 15 and this wall is normally located near the base of a sump or other container containing oil. Four orifices 16 are made in the side of the pipe near the wall 15. More than four holes of correspondingly smaller size can be provided.

      The sum of the areas of these orifices is smaller than the area of the cross section of the suction pipe so as to obtain, from a certain speed of rotation of the pump, a speed of passage of the liquid passing through these orifices which always exceeds 1.8 m per second so as to maintain a minimum pressure drop, for example 0.08 kg / cm2 or at least 0.07 kg / cm2 across the orifices, i.e. say between the pressure outside the pipe 13 and the pressure in this pipe.



  Manually or automatically controlled means may be provided to vary the effective size of the orifices so as to provide a small area at low speeds and a larger area at increasing speeds, so as not to unduly restrict the flow rate. the pump at higher speeds.

Claims (1)

REVENDICATION Pompe à engrenages d'un appareil . de transmis- sion d'énergie à rapport variable, caractérisée en ce qu'elle comporte une conduite d'aspiration pourvue d'orifices d'admission ménagés dans la paroi de la conduite à proximité de son extrémité, laquelle est fermée, la somme des aires des orifices étant plus petite que l'aire de section transversale de la con duite. CLAIM Gear pump of an apparatus. transmission of energy with variable ratio, characterized in that it comprises a suction pipe provided with inlet openings formed in the wall of the pipe near its end, which is closed, the sum of orifice areas being smaller than the cross-sectional area of the pipe.
CH335947D 1955-01-14 1956-01-09 Gear pump of a variable ratio power transmission device CH335947A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB335947X 1955-01-14

Publications (1)

Publication Number Publication Date
CH335947A true CH335947A (en) 1959-01-31

Family

ID=10354938

Family Applications (1)

Application Number Title Priority Date Filing Date
CH335947D CH335947A (en) 1955-01-14 1956-01-09 Gear pump of a variable ratio power transmission device

Country Status (1)

Country Link
CH (1) CH335947A (en)

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