US3584986A - Geared pump - Google Patents

Geared pump Download PDF

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Publication number
US3584986A
US3584986A US842125A US3584986DA US3584986A US 3584986 A US3584986 A US 3584986A US 842125 A US842125 A US 842125A US 3584986D A US3584986D A US 3584986DA US 3584986 A US3584986 A US 3584986A
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US
United States
Prior art keywords
bore
sphere
gear pump
housing
diameter
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.)
Expired - Lifetime
Application number
US842125A
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English (en)
Inventor
Gunnar Lyshoj Hansen
Jorgen Hartvig Petersen
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.)
Danfoss AS
Original Assignee
Danfoss AS
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
Priority claimed from DE19681703801 external-priority patent/DE1703801C/de
Application filed by Danfoss AS filed Critical Danfoss AS
Application granted granted Critical
Publication of US3584986A publication Critical patent/US3584986A/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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

Definitions

  • the invention relates to a gear pump of the type having internally and externally toothed, eccentrically disposed members which rotate about their respective axes.
  • the gear pump incorporates a centering device for centering housing elements of the pump during the assembly operations which comprises bores of different diameters in adjacent housing parts and a ball which is press fitted in the bore of larger diameter and has contact with the circular edge of the bore of lesser diameter.
  • the invention relates to a geared pump comprising an externally toothed wheel and an internally toothed ring, guided in a circular cutaway portion in a housing ring, which both rotate about their own axes, but the one being offset from the other, the housing ring being mounted on a part of the housing by means of a centering device and being secured thereto by means of screws.
  • Geared pumps of this kind are known in which a housing part, through which the drive shaft passes, the housing ring and a housing cover, fitted at the opposite end, are firmly interconnected by means of screws.
  • the screws extend through relatively large holes in the housing ring, so that the latter can, before the screws are tightened, be accurately aligned in relation to the shaft bearing in such manner that the two toothed elements can rotate smoothly despite their axes being mutually offset.
  • a stud is provided on one side of the end face of the housing ring, which stud extends into a bore in the contiguous part of the housing and thus limits the aligning movement to a rotary movement.
  • the object of the invention is to provide a simple play-free centering device which ensures that the faces of the two housing elements lie against each other in a flat and parallel manner.
  • this object is achieved by means of a sphere which is held in the first housing element in such a way that it can be forced into its holder, and by means of hole in the second housing element, the free end edge of which has a diameter smaller than the diameter of the sphere.
  • the second housing element bearing on the sphere by the end edge, can be swung as required and therefore positioned with its end face parallel with the end face of the first housing element. Since the sphere can be forced into its holder this enables the free end edge of the hole to correspond precisely to the diameter of the bearing circle on the sphere when the two housing elements lie against each other, and a play-free fit is therefore ensured. Neither effect is adversely influenced by lack ofprecision in making the hole or the sphere-holder (inclined axis, large tolerances and so on). Moreover, any burr present is pressed in by the sphere being forced into the holder and into the hole, so that no special deburring operation needs to be carried out.
  • Assembly can be of a very simple kind.
  • the invention provides for the sphere firstly being pressed into the holder only to an extent such that it is brought into its final position only when the housing elements are pressed against each other.
  • the second housing element is thus used as a pressure-applying member. Consequently, a play-free fit is ensured in the final position.
  • the holder in the first housing element consists 'of a bore having a somewhat smaller diameter than the diameter of the sphere.
  • the hole in the second housing element can consist of a bore having a diameter smaller than the diameter of the bore in the first housing element.
  • the circle of contact between the end edge of the hole and the sphere is such' that the radius running to the center of the sphere forms an angle of more than 60 but less than with the axis of the hole. In this way the sphere can be wedged into the hole and this facilitates the provision of the play-free retaining arrangement. Additionally, a relatively large area of contact with the sphere is obtained by only slightly deforming the circumference of the hole near its end edge.
  • This centering device is suitable for a in variety of purposes. If the initially described centering device has to be replaced, it is of advantage to fit a single centering sphere on one side on the surface of contact between the housing ring and the end wall of the housing through which the shaft passes, and to create a pivotal point.
  • the ball can be fitted on a line which runs roughly at right angles to the line connecting the axes of the two toothed elements. By rotating this sphere, the distance between the two toothed elements can be altered in the correct direction.
  • the housing elements are firstly loosely screwed together, the pump then started up and the screws tightened while the pump is running. Since, due to the sphere, the housing ring is free to move only in one direction, it adjusts itself accurately to the correct position when the pump is running.
  • the centering device can, however, also be used for other purposes.
  • at least two centering spheres can be provided on the surface of contact between the housing ring and a cover applied to that end opposite the end wall of the housing and provided with supply and discharge passages.
  • the position of the housing ring and the cover can be accurately fixed by means of two such spheres. Consequently, the supply and discharge passages can be adapted with greater accuracy to the position of the chambers between the toothed elements. Hitherto, the cover has been centered only by means of the screws.
  • the holders for the spheres should be provided in the housing ring. After dismantling the pump, a housing ring that can be produced in a very simple manner, can be exchanged and when the pump is put together again, play-free centering can be carried out.
  • the bores in the housing ring can pass right through it. These bores can be easily made Furthermore, during a repair operation, the spheres can be knocked out and replaced, for example, by spheres of a somewhat greater diameter.
  • FIG. 1 illustrates a geared pump of the invention in side elevation and partly in section on the line A-A of FIG. 2,
  • FIG. 2 is a section on the line B-B OF FIG. 1, and
  • FIG. 3 is a sectional illustration, on a larger scale, of the centering device.
  • the geared pump illustrated has a housing part 1 which incorporates the bearing for a drive shaft 2, a housing ring 3 and a housing cover 4, which are interconnected by screwbolts 5.
  • the screwbolts extend loosely through holes 6 in the housing ring 3 and the cover 4.
  • An externally toothed wheel 7 is fitted on the shaft 2.
  • Mounted in a circular cutaway portion 3 in the housing ring 3 is an internally toothed ring 9 having one tooth more than the wheel 7.
  • the housing part 1, the cover 4 and the toothed elements 7 and 9 form pump chambers 10, which increase in size at each revolution and then diminish in size again.
  • the chambers 10 are supplied through passages 11 in the cover which are only shown schematically.
  • the axis l2 of the cutaway portion 8 and thus of the toothed ring 9 is offset from the axis I3 "of the shaft '2 and therefore of the toothed wheel 7.
  • the housing ring 3 contains a straight-through bore l5, and the housing part 1 a bore 16 closed at one end. Also, there is provided a sphere 17, the center 18 of which is located at a little distance inside the housing ring 3.
  • the diameter of the bore 15 is somewhat smaller than the diameter of the sphere 17, for example onetenth/two-tenths of a millimeter smaller. The sphere 18 therefore sits firmly in the bore 15, but can be pushed into it when force is applied thereto.
  • the diameter of the bore 16 is somewhat smaller than that of the bore 15, for example one-tenth/two-tenths of a millimeter smaller.
  • Two similar centering devices 20 and 21 are fitted between the housing ring 3 and the cover 4, the bore of greater diameter again being provided in the housing ring.
  • the position of the two centering devices is shown in broken lines in FIG. 2.
  • the position of the cover 4 relatively to the ring 3 is accurately fixed by these two centering devices.
  • the procedure in assembly is that firstly three spheres 17 are pressed lightly into their associated bores 15.
  • the pump is then fully assembled but the screwbolts 5 are only slightly tightened.
  • the pump shaft 2 is driven, the precisely correct distance between the axes 12 and 13 being set, since the ring 3 can rotate only about the centering device 14.
  • the screwbolts 5 are tightened.
  • the spheres 17 are pushed through the end edges of the bore 16 so far into the bores that when the housing elements lie against each other accurate, play-free contact is achieved.
  • the whole assembly can be sealed by a cover 22.
  • a gear pump comprising first and second housing members having flat surfaces in abutting engagement in a plane, said first member having a circular cutout, an externally toothed wheel, an internally toothed wheel in eccentrically disposed and in surrounding relation to said externally toothed wheel, said internally toothed wheel having a circular periphery and being rotatably disposed in said cutout, said wheels being rotatable about their respective axes to form expanding and contracting chambers, a centering device comprising a first cylindrical bore in said first member, a sphere having a slightly larger diameter than said first bore being press fitted into said first bore, said first bore having a depth substantially larger than the diameter of said sphere, a second cylindrical bore in said second member having a smaller diameter than said first bore and having a circular edge thereof in said plane and in contact with said sphere, and fastening means for holding said members in abutting engagement.
  • a gear pump according to claim 1 wherein a radius from the center of said sphere to said circular edge is between 60 and relative to the axis of said second bore.
  • a gear pump according to claim 1 in which said sphere forms a pivoting point for relative pivotal movement between said members prior to said fastening means being applied.
  • a gear pump according to claim 1 wherein said sphere is disposed on a first line which is substantially normal to a second line which extends through said axes, said first line intersecting said second line in the vicinity of said axes.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rotary Pumps (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)
US842125A 1968-07-12 1969-07-16 Geared pump Expired - Lifetime US3584986A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19681703801 DE1703801C (de) 1968-07-12 Vorrichtung zur gegenseitigen Lage fixierung von Gehauseteilen einer Zahn radpumpe

Publications (1)

Publication Number Publication Date
US3584986A true US3584986A (en) 1971-06-15

Family

ID=5688566

Family Applications (1)

Application Number Title Priority Date Filing Date
US842125A Expired - Lifetime US3584986A (en) 1968-07-12 1969-07-16 Geared pump

Country Status (9)

Country Link
US (1) US3584986A (de)
AT (1) AT287503B (de)
BE (1) BE735995A (de)
CH (1) CH503204A (de)
DK (1) DK121686B (de)
ES (1) ES369411A1 (de)
FR (1) FR2012892A1 (de)
GB (1) GB1272792A (de)
NL (1) NL6910553A (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3824047A (en) * 1973-03-23 1974-07-16 Dermott H Mc Floating rotary ring member of fluid displacement device
US4443168A (en) * 1980-09-20 1984-04-17 Robert Bosch Gmbh Gear machine centering arrangement
US6617367B1 (en) 1999-09-20 2003-09-09 Sealed Air Corporation Internally generated rotor set for low viscosity and abrasive metering applications
US20040175277A1 (en) * 2002-06-28 2004-09-09 Cox C. Paul Hydrostatic pump assembly having symmetrical endcap

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3137234A (en) * 1959-08-10 1964-06-16 Roper Hydraulics Inc Method of pumping and separating liquid and gaseous fluids
US3484142A (en) * 1968-01-03 1969-12-16 Us Air Force Plummer blocks and manufacture methods thereof

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3137234A (en) * 1959-08-10 1964-06-16 Roper Hydraulics Inc Method of pumping and separating liquid and gaseous fluids
US3484142A (en) * 1968-01-03 1969-12-16 Us Air Force Plummer blocks and manufacture methods thereof

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3824047A (en) * 1973-03-23 1974-07-16 Dermott H Mc Floating rotary ring member of fluid displacement device
US4443168A (en) * 1980-09-20 1984-04-17 Robert Bosch Gmbh Gear machine centering arrangement
US6617367B1 (en) 1999-09-20 2003-09-09 Sealed Air Corporation Internally generated rotor set for low viscosity and abrasive metering applications
US20030212153A1 (en) * 1999-09-20 2003-11-13 Sealed Air Corporation (Us) Internally generated rotor set for low viscosity and abrasive metering applications
US6889871B2 (en) 1999-09-20 2005-05-10 Sealed Air Corporation Internally generated rotor set for low viscosity and abrasive metering applications
US20040175277A1 (en) * 2002-06-28 2004-09-09 Cox C. Paul Hydrostatic pump assembly having symmetrical endcap

Also Published As

Publication number Publication date
FR2012892A1 (de) 1970-03-27
DK121686B (da) 1971-11-15
NL6910553A (de) 1970-01-14
CH503204A (de) 1971-02-15
AT287503B (de) 1971-01-25
DE1703801A1 (de) 1972-03-16
ES369411A1 (es) 1971-06-16
GB1272792A (en) 1972-05-03
BE735995A (de) 1969-12-16

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