EP0661450A1 - Rotierender Energieumformer für Druckflüssigkeiten mit Wellenabdichtung - Google Patents

Rotierender Energieumformer für Druckflüssigkeiten mit Wellenabdichtung Download PDF

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Publication number
EP0661450A1
EP0661450A1 EP94309037A EP94309037A EP0661450A1 EP 0661450 A1 EP0661450 A1 EP 0661450A1 EP 94309037 A EP94309037 A EP 94309037A EP 94309037 A EP94309037 A EP 94309037A EP 0661450 A1 EP0661450 A1 EP 0661450A1
Authority
EP
European Patent Office
Prior art keywords
baffle
shaft
housing
fluid pressure
seal
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.)
Withdrawn
Application number
EP94309037A
Other languages
English (en)
French (fr)
Inventor
Richard A. Weatherly
J. Shannon Melton
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
Vickers Inc
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 Vickers Inc filed Critical Vickers Inc
Publication of EP0661450A1 publication Critical patent/EP0661450A1/de
Withdrawn legal-status Critical Current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
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/04—Draining
    • 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
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
    • F04B1/20—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis having rotary cylinder block
    • F04B1/2014—Details or component parts

Definitions

  • the present invention is directed to rotary fluid pressure energy translating device with shaft seal, and more particularly to an improved shaft seal construction that finds particular utility in rotary hydraulic devices such as hydraulic pumps and motors.
  • Rotary hydraulic machines such as motors and pumps conventionally include a housing, a rotatable shaft that extends from the housing for coupling to an external device, and a shaft seal within the housing surrounding the shaft for preventing leakage of hydraulic fluid along the shaft into or out of the housing.
  • the seal conventionally includes an annular resilient sealing ring. In the event of leakage, the fluid may leak along the shaft past the seal into or out of the housing, causing loss of fluid and potential contamination. If the pump is mounted on a transmission housing gear box, the pump fluid could leak into the transmission, or the transmission fluid could leak into the pump.
  • a rotary machine in United States Patent No. 5,201,647, includes a housing, a shaft carried for rotation and extending from the housing, and a shaft seal carried by the housing in sealing engagement with the shaft to prevent leakage of fluid along the shaft.
  • the shaft seal comprises an annular shell adapted for mounting within the housing surrounding the shaft and radially spaced therefrom. At least one, and preferably two, annular resilient sealing rings are carried by the shell and extend radially inwardly therefrom into rotary sealing engagement with the shaft.
  • a pressure relief valve includes at least one opening that extends radially through the shell and a resilient band surrounding the shell externally of such opening. Pressure of fluid urges the band away from the shell to permit flow of fluid through the shell opening externally of the shell and band, while the band prevents entry of dirt or debris through the opening into the shell.
  • the fluid used in the hydraulic system on aircraft is incompatible with the fluid used in the gearbox which drives the hydraulic pump. Since the pump and gearbox are directly connected, they form a cavity into which the leakage past the shaft seals of both devices drain into and mix. This cavity typically has a common overboard drain to allow the fluids to be evacuated to avoid filling this cavity with fluid.
  • E.T.O.P. Extended Twin Engine Operations
  • In-flight engine shut downs are more critical for aircraft with only two engines as opposed to aircraft with three or four engines. This rating allows the aircraft much greater range during normal operations. Pilots must plan their routes to maintain a certain flying time from a viable airport at all times during a flight in case of an emergency.
  • An E.T.O.P.'s rating increases the required time. The baffle design will help twin engine aircraft obtain this rating.
  • the objectives of the present invention are to provide a shaft seal system between the pump and gear box which precludes mixing of the fluids and stopping-up of the drains whereby avoiding in-flight engine shut down.
  • the shaft seal system comprises a baffle provided on a pump end member adjacent to the gear box and functioning to define a fluid chamber to which leakage through the pump seal passes by passages between the baffle and the end member.
  • the baffle interfaces with a seal contained in the pump end member.
  • the baffle preferably supports the outer annular seal which engages the rotary pump shaft.
  • Fig. 1 is a longitudinal sectional view through a rotary pump embodying the invention.
  • Fig. 2 is a fragmentary view on an enlarged scale of a portion of the pump shown in Fig. 1 with the gear box interface shown.
  • Fig. 3 is a rear plan view of the baffle utilized in the pump.
  • Fig. 4 is an end view of the end member of the pump taken from the right as viewed in Fig. 2 with the baffle removed.
  • FIG. 5 is a fragmentary view of a modified form of rotary pump.
  • the invention relates to a rotary pump, herein shown as a variable displacement pump.
  • an axial piston pump has a housing 10, a valve plate 14 which includes an inlet port and an outlet port.
  • a drive shaft 16 is rotatably supported in housing 10 by a bearing 18 in one end of the housing 10 and bearing 20 in an end member (mounting flange) 22.
  • the housing 10 has an inner cavity 24 which receives a rotating pump assembly including cylinder barrel 26 rotatably mounted therein. Cylinder barrel 26 is drivingly connected to the drive shaft 16 by a drive spline 16c.
  • the cylinder barrel 26 has a plurality of bores 30 open at one end to receive pistons 32. Each piston 32 is held in place by a shoe plate 34.
  • Each shoe 38 bears against an angularly adjustable yoke 40 so that as the barrel 26 is rotated by drive shaft 16, piston shoes 38 follow the yoke 40 causing the pistons 32 to reciprocate within the bores 30.
  • Each bore 30 has a port opposite its open end which communicates fluid between valve plate 14 and the bore 30. Both an inlet port (not shown) and an outlet port (not shown) are formed within the valve plate 14.
  • the inlet and outlet ports are arranged in the valve plate 14 so that the pistons 32 pass the inlet port as they are being pulled away from the valve plate 14 and are forced back in toward the valve plate 14 as they pass outlet port.
  • a fixed displacement pump is shown, for example, in United States Patent No. 5,230,274, and a variable displacement pump in United States patent 3,643,550, incorporated herein by reference.
  • the pump includes a rotary impeller 50 which functions to boost the inlet pressure to the piston 32 as it is pulled back from valve plate 14, thus filling bore 30 with fluid.
  • the pump shaft 16 is formed in two sections shaft 16a, 16b with an inboard seal 52 as well as an outboard seal 54. As shown in FIG. 2 an inboard seal 52 and an outboard seal 54 engage the section 16a while the outer section 16b extends axially outwardly for engagement with the drive spline of a gear box.
  • the flange end member 22 of the pump (FIG. 2) is formed with arcuate chambers 56 and has an annular shoulder 58 for receiving a baffle 60 in the form of a plate that is held in position by screws (not shown).
  • the baffle 60 engages a seal 62 (FIG. 2) provided in a groove 64 in the end member 22 of the pump (Fig. 4).
  • the baffle 60 (FIG. 3) has a plurality of radial grooves 68 in a planar surface thereof that form passages P (FIG. 2) when installed into end member 22.
  • the baffle 60 further supports the outermost seal 54 (FIG. 1). Any leakage past the inner seal 52 passes through the passages P formed by the grooves to the annular chamber 56. Fluid collected in chamber 56 is drained overboard via the aircrafts drip drain system. This precludes the mixing of the incompatible fluids which leak past the pump and gear box seals.
  • the outboard seal 54 is omitted.
  • the baffle 60a is modified so that there is no recess for an outboard seal.
  • the baffle 60a functions substantially the same except that a small amount of leakage may occur between the cavities of the pump and the gear box.
  • the fluids may be mixed. In instances where the fluids are comparable, this form provides a viable alternative.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)
  • Reciprocating Pumps (AREA)
  • Details Of Reciprocating Pumps (AREA)
EP94309037A 1993-12-06 1994-12-05 Rotierender Energieumformer für Druckflüssigkeiten mit Wellenabdichtung Withdrawn EP0661450A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US16312493A 1993-12-06 1993-12-06
US163124 1993-12-06

Publications (1)

Publication Number Publication Date
EP0661450A1 true EP0661450A1 (de) 1995-07-05

Family

ID=22588590

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94309037A Withdrawn EP0661450A1 (de) 1993-12-06 1994-12-05 Rotierender Energieumformer für Druckflüssigkeiten mit Wellenabdichtung

Country Status (2)

Country Link
EP (1) EP0661450A1 (de)
JP (1) JPH07208327A (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0836005A1 (de) * 1996-10-09 1998-04-15 Denison Hydraulics, Inc. Rückgewinnungseinrichtung für ein hydraulisches Pumpsystem
EP1050680A3 (de) * 1999-05-07 2001-03-28 Brueninghaus Hydromatik Gmbh Wellendichtung für hydraulische Maschine
CN105020379A (zh) * 2014-04-23 2015-11-04 本田技研工业株式会社 变速器的轴承润滑结构
CN106286314A (zh) * 2016-08-11 2017-01-04 武汉船用机械有限责任公司 潜液压载泵

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2022128213A (ja) * 2021-02-22 2022-09-01 株式会社小松製作所 ターボ型ポンプ及び流体供給ユニット

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4896890A (en) * 1989-07-10 1990-01-30 Ingersoll-Rand Company Oil scavenge check valve apparatus
WO1991009240A1 (en) * 1989-12-14 1991-06-27 Ingersoll-Rand Company Oil scavenger system for a seal for a rotary shaft
US5035155A (en) * 1989-09-01 1991-07-30 Robledo Ismael L Device for preventing contamination of transmission fluid

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4896890A (en) * 1989-07-10 1990-01-30 Ingersoll-Rand Company Oil scavenge check valve apparatus
US5035155A (en) * 1989-09-01 1991-07-30 Robledo Ismael L Device for preventing contamination of transmission fluid
WO1991009240A1 (en) * 1989-12-14 1991-06-27 Ingersoll-Rand Company Oil scavenger system for a seal for a rotary shaft

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0836005A1 (de) * 1996-10-09 1998-04-15 Denison Hydraulics, Inc. Rückgewinnungseinrichtung für ein hydraulisches Pumpsystem
EP1050680A3 (de) * 1999-05-07 2001-03-28 Brueninghaus Hydromatik Gmbh Wellendichtung für hydraulische Maschine
CN105020379A (zh) * 2014-04-23 2015-11-04 本田技研工业株式会社 变速器的轴承润滑结构
CN105020379B (zh) * 2014-04-23 2017-09-22 本田技研工业株式会社 变速器的轴承润滑结构
CN106286314A (zh) * 2016-08-11 2017-01-04 武汉船用机械有限责任公司 潜液压载泵
CN106286314B (zh) * 2016-08-11 2018-06-26 武汉船用机械有限责任公司 潜液压载泵

Also Published As

Publication number Publication date
JPH07208327A (ja) 1995-08-08

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