US3876347A - Gear pump or motor with unitary flexible end seal plate - Google Patents

Gear pump or motor with unitary flexible end seal plate Download PDF

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Publication number
US3876347A
US3876347A US227225A US22722572A US3876347A US 3876347 A US3876347 A US 3876347A US 227225 A US227225 A US 227225A US 22722572 A US22722572 A US 22722572A US 3876347 A US3876347 A US 3876347A
Authority
US
United States
Prior art keywords
gears
plate
arc
gear
slot
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
US227225A
Other languages
English (en)
Inventor
Philipp Becker
Anthony Lindsay
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.)
Vickers Inc
Original Assignee
Sperry Rand Corp
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 Sperry Rand Corp filed Critical Sperry Rand Corp
Priority to US227225A priority Critical patent/US3876347A/en
Priority to AU50994/73A priority patent/AU470449B2/en
Priority to IT47685/73A priority patent/IT976882B/it
Priority to CA161,439A priority patent/CA979735A/en
Priority to DE19732306540 priority patent/DE2306540C3/de
Priority to FR7305072A priority patent/FR2172686A5/fr
Priority to SE7302026A priority patent/SE389895B/xx
Priority to JP48019137A priority patent/JPS5148801B2/ja
Priority to GB762673A priority patent/GB1422271A/en
Priority to IN1469/CAL/73A priority patent/IN138892B/en
Application granted granted Critical
Publication of US3876347A publication Critical patent/US3876347A/en
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.
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
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/0003—Sealing arrangements in rotary-piston machines or pumps
    • F04C15/0023—Axial sealings for working fluid
    • F04C15/0026—Elements specially adapted for sealing of the lateral faces of intermeshing-engagement type machines or pumps, e.g. gear machines or pumps

Definitions

  • ABSTRACT A gear pump has a seal for the end faces of the gears formed of a flexible plate clamped between body parts at its periphery.
  • the inner part of the plate is physically separated from the periphery by a through-slot along the pressure are of the gears and by an opening along the intake arc; being joined to the periphery only along a short are of less than 90 adjacent the intake are by a cantilever beam portion of the plate. This allows freedom for the sealing portion to maintain flatter contact with the gear end faces, particularly at the arc of tooth intermesh.
  • the disadvantage of the first approach lies in the ad ditional leakage path and the consequent loss of efficiency which is introduced by the need for sliding motion between the cheek plate and the gear cavity at the latter's periphery.
  • the disadvantage of the second approach lies in the need for a large number of separate pressure cavities which are required to be placed along the arc of the pressure gradient if excessive local pressures are not to be experienced along various portions of the flexible sealing plate.
  • the invention embraces a gear pump or motor comprising a plurality of gears with hub portions and toothed portions having end faces in common planes, a driveshaft for one of the gears, a multi-part body enclosing and providing rotary support, for the gears, means forming inlet and outlet connections to points on opposite sides of the gear meshing point, a movable sealing plate at one end face of the gears, means in the body for applying outlet pressure to urge the sealing plate into contact with the gears, the sealing plate having a contour to overlie the toothed portions solely along arcs no larger than adjacent the intake point and along the arc of intermesh and to overlie the hub portions throughout their circumference.
  • FIG. 1 is a cross sectional view of a gear pump embodying a preferred form of the present invention.
  • FIG. 2 is an end view, partially in section along line 2-2 of FIG. 1.
  • FIG. 3 is a view of the sealing face of the sealing plate.
  • FIG. 4 is a view of the back face of the sealing plate.
  • FIG. 5 is a fragmentary sectional view of a portion of FIG. 1.
  • the gear pump in the embodiment of the invention which is illustrated includes a three-part body 10 which encloses a pair of gears 12, each of which hasshafts journalled in bearings 14, one of them having a driveshaft 16.
  • the three parts of the body 10 are secured together by bolts 18 and dowels 20 and have the usual inlet and outlet connections 22 and 24, all of which are typical of one of the many forms of hydraulic gear pumps.
  • a flexible sealing plate 26 Clamped between two of the parts of the body 10 is a flexible sealing plate 26.
  • This plate is preferably made of a bimetallic material such as, for example, a steel backing and a bronze bearing material on the sealing surface.
  • the configurations of the sealing plate 26 comprises an oval outline and generally consists of two principal portions, the peripheral portion designated 28 and the sealing portion designated 30. These two portions are separated by a through-slot 32 which is generally in the shape of a FIG. 3 and by a hole or opening 34 opposite the inlet portion of the pump body. These, along with the bolt and dowel holes, are preferably stamped out of a flat blank of material and leave a sealing portion 30 which is generally in the shape of a pair of eyeglass frames. These include something over 270 of annular sealing portion 36 alongside each gear and aligning radially with the face of the hub portion of each. The two annular portions 36 are connected at the tooth intermeshing area by a bridge 38. Cantilever beam sections 40 connect each of the annular sealing portions 36 with the peripheral portion 28 and act as bendable beams permitting the sealing portions to be pressed against the end faces of the gear hubs while the peripheral portion 28 is rigidly clamped between the body parts.
  • the adjacent body part at the back of the sealing plate 26 is provided with a symmetrical recess 42 which registers with the groove 32 and extends radially inwardly over the sealing portions 36 to a limited extent.
  • the recess 42 also extends circumferentially around beyond the ends of the slot 32 approximately half way across the bridges 40.
  • a shaped elastomeric seal 44 which may be held in position by a spacer 46.
  • the cavity 42 is open to outlet pressure through the slot 32.
  • the thin flexible sealing plate 26 In operation with the pump running under pressure. the thin flexible sealing plate 26 has its peripheral portion 28 clamped rigidly between the body parts and its sealing portion 30, free to move as permitted by the bendable beam portion 40. Fluid pressure from the out let passes through the slot 32 to the pressure chamber 42 and exerts full outlet pressure over that portion of the sealing portion 30 which lies within the chamber 42 as well as over the portion of the bridges 40 which also lie within the chamber 42.
  • the sealing face is exposed to full outlet pressure along the interface with the gear hubs through an are extending from the tooth intermeshing point circumferentially around to the ends of the slot 32. This separating force is substantially balanced by the pressure applied within the chamber 42 over the same are but over a different distance in a radial direction.
  • the bridges 40 are subjected to bending forces by this pressure and yield to the extent of permitting the sealing portion 30 to take up a position in close running contact to the end faces of the gear hubs and to maintain the clearance at an optimum value commensurate with the film strength of the oil at any given set of conditions. In this way, there is no need to utilize comparatively rigid cheek plates or with flexible ones to provide separated areas, each connected to hydraulic pressure at a different level along the arc of gear tooth travel.
  • a pump or motor comprising a plurality of interineshing gears with a driveshaft for one of them.
  • a multi-part body enclosing and providing rotary support for the gears, means forming inlet and outlet connections to points on opposite sides of the meshing point of the gears, an improved end seal for the gears including a unitary flexible plate of uniform thickness having a peripheral portion clamped between body parts in a plane adjacent the gear end faces and having a sealing portion providing connected annular surfaces adapted to be pressed against the gear end faces and which are separated from the peripheral portion throughout more than 270 of are at each gear by a through-slot surrounding the high pressure arcs of the gears and by an opening adjacent the fluid intake arc of the gears, the plate having short bendable beam portions connecting the peripheral portion and the sealing portion along arcs of the gears between the ends of the slot and the opening. and means forming a pressure chamber in the body adjacent the back face of the plate and shaped to surround the slot and apply outlet pressure to the sealing portion along the meshing

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rotary Pumps (AREA)
  • Hydraulic Motors (AREA)
US227225A 1972-02-17 1972-02-17 Gear pump or motor with unitary flexible end seal plate Expired - Lifetime US3876347A (en)

Priority Applications (10)

Application Number Priority Date Filing Date Title
US227225A US3876347A (en) 1972-02-17 1972-02-17 Gear pump or motor with unitary flexible end seal plate
AU50994/73A AU470449B2 (en) 1972-02-17 1973-01-11 A gear pump and motor
IT47685/73A IT976882B (it) 1972-02-17 1973-01-15 Perfezionamento nelle pompe ad ingranaggi
CA161,439A CA979735A (en) 1972-02-17 1973-01-17 Gear pump
DE19732306540 DE2306540C3 (de) 1972-02-17 1973-02-10 Hochdruckzahnradpumpe
SE7302026A SE389895B (sv) 1972-02-17 1973-02-13 Anordning vid eo kugghjulspump- eller motor
FR7305072A FR2172686A5 (it) 1972-02-17 1973-02-13
JP48019137A JPS5148801B2 (it) 1972-02-17 1973-02-16
GB762673A GB1422271A (en) 1972-02-17 1973-02-16 Externally meshing gear pumps and motors
IN1469/CAL/73A IN138892B (it) 1972-02-17 1973-06-23

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US227225A US3876347A (en) 1972-02-17 1972-02-17 Gear pump or motor with unitary flexible end seal plate

Publications (1)

Publication Number Publication Date
US3876347A true US3876347A (en) 1975-04-08

Family

ID=22852270

Family Applications (1)

Application Number Title Priority Date Filing Date
US227225A Expired - Lifetime US3876347A (en) 1972-02-17 1972-02-17 Gear pump or motor with unitary flexible end seal plate

Country Status (8)

Country Link
US (1) US3876347A (it)
JP (1) JPS5148801B2 (it)
AU (1) AU470449B2 (it)
CA (1) CA979735A (it)
FR (1) FR2172686A5 (it)
GB (1) GB1422271A (it)
IT (1) IT976882B (it)
SE (1) SE389895B (it)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105631104A (zh) * 2015-12-24 2016-06-01 哈尔滨锅炉厂有限责任公司 新型齿形密封板制造工艺
CN106014975A (zh) * 2016-07-19 2016-10-12 江苏大学 一种悬臂式双螺杆喷水推进泵
US11311137B2 (en) 2014-01-03 2022-04-26 Koninklijke Douwe Egberts B.V. Exchangeable supply pack for a beverage dispensing machine, doser, pump assembly and method of manufacturing

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2702509A (en) * 1951-04-06 1955-02-22 Air Equipment Rotary pump
US3213800A (en) * 1965-05-04 1965-10-26 Webster Electric Co Inc Unitary wear plate and seal
US3213799A (en) * 1962-12-26 1965-10-26 Webster Electric Co Inc Rotary pump or motor
US3270680A (en) * 1964-12-17 1966-09-06 Kingston Products Corp Pressure loaded gear pump
US3376824A (en) * 1965-07-01 1968-04-09 Turolla Marco Gear pump

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2702509A (en) * 1951-04-06 1955-02-22 Air Equipment Rotary pump
US3213799A (en) * 1962-12-26 1965-10-26 Webster Electric Co Inc Rotary pump or motor
US3270680A (en) * 1964-12-17 1966-09-06 Kingston Products Corp Pressure loaded gear pump
US3213800A (en) * 1965-05-04 1965-10-26 Webster Electric Co Inc Unitary wear plate and seal
US3376824A (en) * 1965-07-01 1968-04-09 Turolla Marco Gear pump

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11311137B2 (en) 2014-01-03 2022-04-26 Koninklijke Douwe Egberts B.V. Exchangeable supply pack for a beverage dispensing machine, doser, pump assembly and method of manufacturing
CN105631104A (zh) * 2015-12-24 2016-06-01 哈尔滨锅炉厂有限责任公司 新型齿形密封板制造工艺
CN105631104B (zh) * 2015-12-24 2018-10-12 哈尔滨锅炉厂有限责任公司 齿形密封板的制造方法
CN106014975A (zh) * 2016-07-19 2016-10-12 江苏大学 一种悬臂式双螺杆喷水推进泵

Also Published As

Publication number Publication date
CA979735A (en) 1975-12-16
IT976882B (it) 1974-09-10
FR2172686A5 (it) 1973-09-28
JPS5148801B2 (it) 1976-12-23
JPS4890002A (it) 1973-11-24
DE2306540B2 (de) 1976-01-15
AU470449B2 (en) 1976-03-18
AU5099473A (en) 1974-07-11
DE2306540A1 (de) 1973-08-30
GB1422271A (en) 1976-01-21
SE389895B (sv) 1976-11-22

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Legal Events

Date Code Title Description
AS Assignment

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