US3680990A - Removable liner for gear pump - Google Patents

Removable liner for gear pump Download PDF

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Publication number
US3680990A
US3680990A US139124A US3680990DA US3680990A US 3680990 A US3680990 A US 3680990A US 139124 A US139124 A US 139124A US 3680990D A US3680990D A US 3680990DA US 3680990 A US3680990 A US 3680990A
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United States
Prior art keywords
cavity
liner
pump
inlet
gears
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
US139124A
Inventor
Raymond B Pettibone
Albin J Niemiec
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Vickers Inc
Original Assignee
Sperry Rand Corp
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Assigned to SPERRY CORPORATION reassignment SPERRY CORPORATION CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: SPERRY RAND CORPORATION
Assigned to VICKERS, INCORPORATED reassignment VICKERS, INCORPORATED ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: SPERRY CORPORATION A DE CORP.
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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
    • F04C2/12—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
    • F04C2/18—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 with similar tooth forms
    • 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
    • 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
    • F04C2240/80—Other components
    • F04C2240/802—Liners
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49229—Prime mover or fluid pump making
    • Y10T29/49236—Fluid pump or compressor making
    • Y10T29/49242—Screw or gear type, e.g., Moineau type

Definitions

  • the present invention comprises a hydraulic pump with a body having an ovoid cavity, a pair of intermeshing gears mounted to rotate in the cavity, inlet and outlet passages in the body, the inlet passage being branched to enter the cavity at the end faces of the gears, and a liner for the ovoid surface of the cavity comprising a single piece of resilient sheet material extending in contact with the tooth peripheries of both gears and across the area adjacent the inlet, but having free ends providing an opening adjacent the outlet, the linear having a preformed free shape larger than the cavity and being elastically compressed at its free ends to fit the cavity.
  • the invention further comprises such a pump wherein the inlet passage includes a third branch extending perpendicular to the plane containing the gear axes and entering the cavity midway between the end faces of the gears.
  • FIG. 1 is a transverse cross section of a gear pump embodying a preferred form of the present invention.
  • FIG. 2 is a fragmentary cross section on line 2-2 of FIG. 1.
  • FIG. 3 is a side view of a liner incorporated in the pump of FIG. 1.
  • FIG. 4 is a view of the liner as seen from the plane 4-4 of FIG. 3.
  • FIG. 5 is a cross section on line 5-5 of FIG. 3.
  • FIG. 6 is a cross section on line 6-6 of FIG. 3.
  • FIG. 7 is a perspective view of a portion of the pump body and liner adjacent the inlet.
  • the pump comprises a body 10 having an ovoid cavity 12 within which the usual pair of meshing gears 14 is mounted for rotation.
  • An inlet passage 16 and an outlet passage 20 are provided in the body.
  • the inlet passage 16 has a pair of lateral branches 18 which feed fluid to the end faces of the gear teeth and, more importantly, to the interdental spaces.
  • a third branch 22 extends straight inwardly to the cavity 12 to carry a small portion of the total inlet stream inwardly to a point midway between the end faces of the gears.
  • the cavity 12 is provided with a liner 24 which is of generally C-shaped configuration. It is illustrated in detail as a separate piece in FIGS. 3 through 6 inclusive.
  • the liner is preferably formed from sheet steel of a resilient or springy nature and is provided with a coating 26 of aluminum or other bearing material suitable for low friction contact with the tooth tips of the gears 14, and capable of wearing in to a close fit with them.
  • the liner in its free state, is formed to be somewhat larger than the cavity 14.
  • the liner in order to insert the liner into the cavity, the liner has to be compressed to the shape illustrated in dot-dash lines and then pushed into the cavity. This results in a tight contact between liner and cavity with the highest pressure of contact existing at the two open tips of the liner where it is exposed to the highest fluid pressure.
  • the latter Adjacent the third inlet branch 22 where it passes through the liner, the latter is provided with a pair of shallow depressions 28 for assisting in the induction of fluid from the branches l8 and 22 to the interdental spaces. These depressions become progressively more shallow toward their ends more distant from the inlet 22.
  • the pump will include the usual additional elements of construction such as bearings, drive shafts, seals, cheek plates, covers, and mounting flanges, all of which may be of known construction and are not illustrated in the present drawings.
  • a hydraulic pump comprising a body having an ovoid cavity, a pair of intermeshing gears mounted to rotate in the cavity, inlet and outlet passages in the body, the inlet passage being branched to enter the cavity at the end faces of the gears, and a liner for the ovoid surface of the cavity comprising a single piece of resilient sheet material extending in contact with the tooth peripheries of both gears and across the area adjacent the inlet, but having free ends providing an opening adjacent the outlet, the liner having a preformed free shape larger than the cavity and being elastically compressed at its free ends to fit the cavity.
  • a pump as defined in claim 1 wherein the liner is formed of sheet steel having an adherent layer of bearing material on its inner surface.
  • a pump as defined in claim 1 wherein the inlet p" sage includes a third branch extending perpendicular to the plane containing the gear axes and entering the cavity midway between the end faces of the gears.

Abstract

A hydraulic pump of the intermeshing spur gear type has a onepiece liner for the gear cavity in the body. The liner is a Cshaped piece of resilient metal coated with bearing material and in its free state, is larger than the cavity and requires elastic compression to be inserted therein. The inlet passage is formed with three branches for improved filling at high speeds.

Description

United States Patent Pettibone et a1.
[ 51 Aug. 1, 1972 REMOVABLE LINER FOR GEAR PUMP Inventors: Raymond B. Pettibone, Troy; Albin J. Niemiec, Sterling Heights, both of Mich.
Sperry Rand Corporation, Troy, Mich.
Filed: April 30, 1971 Appl. No.: 139,124
Assignee:
US. Cl. ..418/178, 418/179, 418/206 Int. Cl ..F04c l/08, F040 15/00 Field of Search ..418/178, 179, 206
[56] References Cited UNITED STATES PATENTS 1,339,565 5/1920 Lambert ..418/179X 1,686,867 10/1928 Kuhn ..418/206 X 1,927,395 9/1933 Edward ..418/206 X 1,982,027 11/1934 Sieper ..418/206 X 2,697,987 12/1954 Barclay ..418/206 X 2,966,860 1/1961 Maynard ..418/179 X Primary Examiner-Allan D. Herrmann Attorney-Theodore Van Meter 5 7 1 ABSTRACT 6 Claims, 7 Drawing Figures PATENTEDAus 1 I972 3.680.990
' sumzorz INVENTORS ???W I11 I 177166 5 19 7 fliwv ATTORNEY usually economically unfeasible either to salvage the body or to replace it with a new one. v
It has been proposed to provide a removable liner for the gear pump body which can be replaced when worn. However, previous attempts to do this have failed because of the difficulty of holding the liner in place 7 against the fluid pressure forces acting upon it. These tend to get behind the liner, that is between the liner and the body, and cause premature wear, as well as allowing leakage from outlet to inlet behind the liner.
Another difficulty with previous gear pumps lies in their limited speed potential due to cavitation occurring at the inlet. A proposal to alleviate this problem is disclosed and claimed in the application of Pettibone et al., Ser. 63,192, filed Aug. 12, 1970 for Power Transmission. The branched inlet passage there disclosed is satisfactory for pumps up to certain limits of tooth depth to width ratios, but beyond this, the filling efficiency tends to fall off.
The foregoing difficulties are overcome by the present invention which comprises a hydraulic pump with a body having an ovoid cavity, a pair of intermeshing gears mounted to rotate in the cavity, inlet and outlet passages in the body, the inlet passage being branched to enter the cavity at the end faces of the gears, and a liner for the ovoid surface of the cavity comprising a single piece of resilient sheet material extending in contact with the tooth peripheries of both gears and across the area adjacent the inlet, but having free ends providing an opening adjacent the outlet, the linear having a preformed free shape larger than the cavity and being elastically compressed at its free ends to fit the cavity.
The invention further comprises such a pump wherein the inlet passage includes a third branch extending perpendicular to the plane containing the gear axes and entering the cavity midway between the end faces of the gears.
IN THE DRAWINGS FIG. 1 is a transverse cross section of a gear pump embodying a preferred form of the present invention.
FIG. 2 is a fragmentary cross section on line 2-2 of FIG. 1.
FIG. 3 is a side view of a liner incorporated in the pump of FIG. 1.
FIG. 4 is a view of the liner as seen from the plane 4-4 of FIG. 3.
FIG. 5 is a cross section on line 5-5 of FIG. 3.
FIG. 6 is a cross section on line 6-6 of FIG. 3.
FIG. 7 is a perspective view of a portion of the pump body and liner adjacent the inlet.
Referring to FIG. 1, the pump comprises a body 10 having an ovoid cavity 12 within which the usual pair of meshing gears 14 is mounted for rotation. An inlet passage 16 and an outlet passage 20 are provided in the body. As seen in FIG. 2, the inlet passage 16 has a pair of lateral branches 18 which feed fluid to the end faces of the gear teeth and, more importantly, to the interdental spaces. A third branch 22 extends straight inwardly to the cavity 12 to carry a small portion of the total inlet stream inwardly to a point midway between the end faces of the gears.
The cavity 12 is provided with a liner 24 which is of generally C-shaped configuration. It is illustrated in detail as a separate piece in FIGS. 3 through 6 inclusive. The liner is preferably formed from sheet steel of a resilient or springy nature and is provided with a coating 26 of aluminum or other bearing material suitable for low friction contact with the tooth tips of the gears 14, and capable of wearing in to a close fit with them. As illustrated in FIG. 3, the liner, in its free state, is formed to be somewhat larger than the cavity 14. Thus, in order to insert the liner into the cavity, the liner has to be compressed to the shape illustrated in dot-dash lines and then pushed into the cavity. This results in a tight contact between liner and cavity with the highest pressure of contact existing at the two open tips of the liner where it is exposed to the highest fluid pressure.
Adjacent the third inlet branch 22 where it passes through the liner, the latter is provided with a pair of shallow depressions 28 for assisting in the induction of fluid from the branches l8 and 22 to the interdental spaces. These depressions become progressively more shallow toward their ends more distant from the inlet 22. By this configuration, it has been found that filling I efficiency is increased apparently due either to an effect similar to that of an impeller pump or to an injector effect somewhatanalogous to a venturi, or to both.
The pump will include the usual additional elements of construction such as bearings, drive shafts, seals, cheek plates, covers, and mounting flanges, all of which may be of known construction and are not illustrated in the present drawings.
We claim:
1. A hydraulic pump comprising a body having an ovoid cavity, a pair of intermeshing gears mounted to rotate in the cavity, inlet and outlet passages in the body, the inlet passage being branched to enter the cavity at the end faces of the gears, and a liner for the ovoid surface of the cavity comprising a single piece of resilient sheet material extending in contact with the tooth peripheries of both gears and across the area adjacent the inlet, but having free ends providing an opening adjacent the outlet, the liner having a preformed free shape larger than the cavity and being elastically compressed at its free ends to fit the cavity.
2. A pump as defined in claim 1 wherein the liner is formed of sheet steel having an adherent layer of bearing material on its inner surface.
3. A pump as defined in claim 2 wherein the layer is an aluminum alloy.
4. A pump as defined in claim 1 wherein the inlet p" sage includes a third branch extending perpendicular to the plane containing the gear axes and entering the cavity midway between the end faces of the gears.
5. A pump as defined in claim 4 wherein the liner contains shallow depressions extending from the end of the third inlet branch in the direction of gear rotation.
6. A pump as defined in claim 5 wherein the depressions are progressively shallower toward their distant ends.

Claims (6)

1. A hydraulic pump comprising a body having an ovoid cavity, a pair of intermeshing gears mounted to rotate in the cavity, inlet and outlet passages in the body, the inlet passage being branched to enter the cavity at the end faces of the gears, and a liner for the ovoid surface of the cavity comprising a single piece of resilient sheet material extending in contact with the tooth peripheries of both gears and across the area adjacent the inlet, but having free ends providing an opening adjacent the outlet, the liner having a preformed free shape larger than the cavity and being elastically compressed at its free ends to fit the cavity.
2. A pump as defined in claim 1 wherein the liner is formed of sheet steel having an adherent layer of bearing material on its inner surface.
3. A pump as defined in claim 2 wherein the layer is an aluminum alloy.
4. A pump as defined in claim 1 wherein the inlet passage includes a third branch extending perpendicular to the plane containing the gear axes and entering the cavity midway between the end faces of the gears.
5. A pump as defined in claim 4 wherein the liner contains shallow depressions extending from the end of the third inlet branch in the direction of gear rotation.
6. A pump as defined in claim 5 wherein the depressions are progressively shallower toward their distant ends.
US139124A 1971-04-30 1971-04-30 Removable liner for gear pump Expired - Lifetime US3680990A (en)

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Application Number Priority Date Filing Date Title
US13912471A 1971-04-30 1971-04-30

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US (1) US3680990A (en)
JP (1) JPS5138441B1 (en)
CA (1) CA959341A (en)
DE (1) DE2219829C3 (en)
FR (1) FR2136019A5 (en)
GB (1) GB1329947A (en)
IT (1) IT950586B (en)
SE (1) SE379831B (en)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3973883A (en) * 1972-07-25 1976-08-10 Vandervell Products Limited Rotary piston machines
US4044589A (en) * 1973-07-20 1977-08-30 Vandervell Products Limited Rotary piston machines
US4099490A (en) * 1972-02-01 1978-07-11 Daimler-Benz Aktiengesellschaft Method for producing a housing casing for a rotary piston internal combustion engine
US4338274A (en) * 1979-10-12 1982-07-06 General Engineering Radcliffe 1979 Limited Method and apparatus for the incorporation of additives into plastics materials
US4487560A (en) * 1981-09-22 1984-12-11 Hitachi, Ltd. Scroll fluid compressor with surface finished flat plates engaging the wraps
US4540355A (en) * 1983-03-15 1985-09-10 Sanden Corporation Axial sealing device for a scroll-type fluid displacement apparatus
US4974318A (en) * 1987-03-11 1990-12-04 Leybold Aktiengesellschaft Method of making a dual-shaft machine
US5567140A (en) * 1995-04-24 1996-10-22 Itt Corporation Keyed insert plate for curved rotary lobe pump chamber walls
US20050123429A1 (en) * 2003-12-09 2005-06-09 Dresser-Rand Company Compressor and a method for compressing fluid
US20140023545A1 (en) * 2012-07-23 2014-01-23 Hamilton Sundstrand Corporation Inlet cutbacks for high speed gear pump

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2120728A (en) * 1982-04-29 1983-12-07 Davall Moulded Gears Rotary fluid meter or pump

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1339565A (en) * 1918-03-20 1920-05-11 J E Mclaughlin Pneumatic drill
US1686867A (en) * 1926-11-03 1928-10-09 Lewis O Kuhn Gear pump
US1927395A (en) * 1931-11-13 1933-09-19 Leonard L Edwards Gear pump
US1982027A (en) * 1931-08-08 1934-11-27 Sieper Fritz Casing for circular piston engines
US2697987A (en) * 1951-05-30 1954-12-28 Barclay Cecil Maddison Gear type pump
US2966860A (en) * 1957-04-03 1961-01-03 Lobee Pump & Machinery Co Pump for corrosive fluids

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1339565A (en) * 1918-03-20 1920-05-11 J E Mclaughlin Pneumatic drill
US1686867A (en) * 1926-11-03 1928-10-09 Lewis O Kuhn Gear pump
US1982027A (en) * 1931-08-08 1934-11-27 Sieper Fritz Casing for circular piston engines
US1927395A (en) * 1931-11-13 1933-09-19 Leonard L Edwards Gear pump
US2697987A (en) * 1951-05-30 1954-12-28 Barclay Cecil Maddison Gear type pump
US2966860A (en) * 1957-04-03 1961-01-03 Lobee Pump & Machinery Co Pump for corrosive fluids

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4099490A (en) * 1972-02-01 1978-07-11 Daimler-Benz Aktiengesellschaft Method for producing a housing casing for a rotary piston internal combustion engine
US3973883A (en) * 1972-07-25 1976-08-10 Vandervell Products Limited Rotary piston machines
US4044589A (en) * 1973-07-20 1977-08-30 Vandervell Products Limited Rotary piston machines
US4338274A (en) * 1979-10-12 1982-07-06 General Engineering Radcliffe 1979 Limited Method and apparatus for the incorporation of additives into plastics materials
US4487560A (en) * 1981-09-22 1984-12-11 Hitachi, Ltd. Scroll fluid compressor with surface finished flat plates engaging the wraps
US4540355A (en) * 1983-03-15 1985-09-10 Sanden Corporation Axial sealing device for a scroll-type fluid displacement apparatus
US4974318A (en) * 1987-03-11 1990-12-04 Leybold Aktiengesellschaft Method of making a dual-shaft machine
US5567140A (en) * 1995-04-24 1996-10-22 Itt Corporation Keyed insert plate for curved rotary lobe pump chamber walls
US20050123429A1 (en) * 2003-12-09 2005-06-09 Dresser-Rand Company Compressor and a method for compressing fluid
US7153112B2 (en) 2003-12-09 2006-12-26 Dresser-Rand Company Compressor and a method for compressing fluid
US20140023545A1 (en) * 2012-07-23 2014-01-23 Hamilton Sundstrand Corporation Inlet cutbacks for high speed gear pump
US9068568B2 (en) * 2012-07-23 2015-06-30 Hamilton Sundstrand Corporation Inlet cutbacks for high speed gear pump

Also Published As

Publication number Publication date
DE2219829A1 (en) 1972-11-16
FR2136019A5 (en) 1972-12-22
JPS5138441B1 (en) 1976-10-21
GB1329947A (en) 1973-09-12
DE2219829B2 (en) 1974-08-15
CA959341A (en) 1974-12-17
SE379831B (en) 1975-10-20
AU3798972A (en) 1973-07-19
DE2219829C3 (en) 1975-03-27
IT950586B (en) 1973-06-20

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Owner name: SPERRY CORPORATION

Free format text: CHANGE OF NAME;ASSIGNOR:SPERRY RAND CORPORATION;REEL/FRAME:003794/0122

Effective date: 19790824

AS Assignment

Owner name: VICKERS, INCORPORATED TROY, MI A DE CORP

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST. EFFECTIVE NOVEMBER 2, 1983;ASSIGNOR:SPERRY CORPORATION A DE CORP.;REEL/FRAME:004337/0889

Effective date: 19831102

Owner name: VICKERS, INCORPORATED,MICHIGAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:SPERRY CORPORATION A DE CORP.;REEL/FRAME:004337/0889

Effective date: 19831102