US3891360A - Gear machine with axially movable end wall seal - Google Patents

Gear machine with axially movable end wall seal Download PDF

Info

Publication number
US3891360A
US3891360A US439020A US43902074A US3891360A US 3891360 A US3891360 A US 3891360A US 439020 A US439020 A US 439020A US 43902074 A US43902074 A US 43902074A US 3891360 A US3891360 A US 3891360A
Authority
US
United States
Prior art keywords
combination
pressure
recesses
chamber
pressure side
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
US439020A
Other languages
English (en)
Inventor
Wilhelm Dworak
Claus Jons
Jan Vlemmings
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Application granted granted Critical
Publication of US3891360A publication Critical patent/US3891360A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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

  • a plurality of shaft-journalling sleeves are provided, each associated with one of the shafts and each having one axial end face directed towards an associated gear for sealing engagement with the same and another axial end face directed away from the gear and towards one of two end walls bounding the chamber.
  • Some or all of these sleeves are provided in their axial end faces which face away from the respective gear with recesses having substantially the contour of a numeral three the open side of which faces the low-pressure side of the fluid machine. It is these last-mentioned sleeves which have limited freedom of axial movement relative to the associated gear.
  • a sealing element is accommodated in and corresponds to the contour of each of these recesses, having free end portions which extend to the circumferential wall bounding the chamber.
  • a small pressure space is formed adjacent each of these free end portions intermediate the same and the associated recess and is in communication with the highpressure side of the fluid machine.
  • journalling members are mounted at least at one axial side of the respective gear in bores of journalling meambers. usually journalling sleeves. of which at least the journalling members at one axial side of the gears have limited freedom of axial movement toward and away from the associated gear.
  • the journalling members are formed with seals which delimit two differential pressure fields. that is a higher and a lower pressure field, and it is the pressure of these fields which presses the movable journalling members against the associated gears.
  • the seal is accommodated in a groove formed in a cover of the housing. which cover is of cast iron or steel.
  • the groove must be milled in the cover. an operation which is evidently labor-intensive in terms of the operations required for the milling, and capital-intensive in terms of the equipment needed.
  • An additional object of the invention resides in such a fluid machine which. despite the improvements obtained. will nevertheless afford an effective seal for delimiting the differential pressure field.
  • one feature of the invention resides. in a fluid machine having a high pressure side and a low pressure side. in a combination comprising a housing having a chamber which is bounded by a circumferential wall and two opposite end walls. A pair of meahing gears is mounted in this chamber for rotation about axially parallel shafts. and these gears each have two opposite axial ends. A plurality of shaft-journalling members is provided. each associated with one ofthe shafts, and each having one axial end face directed towards the associated gear for sealing engagement therewith and an other axial end face directed to one of said end walls and away from the associated gear. At least some selected ones of the journalling members have limited freedom of axial movement relative to the associated gear.
  • a recess is formed in each of the other axial end faces of the selected journalling members and has substantially the contour of a numeral three the open side of which faces the lowpressure side.
  • a sealing element is accommodated in and corresponds to the contour ofeach of the recesses, and each of these sealing elements has free end portions extending to the circumferential wall bounding the chamber.
  • a small pressure space is formed adjacent each of these free end portions intermediate the same and the associated recess and is in communication with the high-pressure side of the fluid machine.
  • the sealing elements separate two pressure fields from one another. namely a high pressure field which is in communication with the lhigh pressure side of the fluid machine. and a low pressure field which is in communication with the low pressure side of the machine.
  • the pressure in the high pressure field presses the axially movable journalling members into sealing engagement with the respectively associated gears and the axial ends thereof.
  • shaftjournalling members'of aluminum are used, then the recesses for the sealing elements can be readily formed during pressure casting of the shaft-journalling members. thus avoiding any need for a separate operation -such as a milling stepwhich was previously required to form the recesses.
  • the arrangement of the recesses and sealing ele ments in the machine according to the present invention has a further advantage. namely it provides for a particularly effective separation of the high pressure field and the low pressure field from one another. because the outer parts of the free arms or end portions of the respective sealing elements are pressedradially outwardly due to fluid pressure against the circumferential wall bounding the chamber.
  • FIG. 1 is an axial section through a fluid machine according to the present invention
  • FIG. 2 is a section taken on line IIII of FIG. 1;
  • FIG. 3 is a section taken on line III-III of FIG. 1;
  • FIG. 4 is a plan view of one of the seals used in FIGS. I-3;
  • FIG. 5 is a plan view of a supporting member used in conjunction with the seals in FIGS. l3.
  • the fluid machine illustrated therein which may be oper ated a pump or as a fluid motorhas a housing 10 which is formed with a chamber 1] having a cross sec tion which approximately resembles a figure eight (compare FIGS. 2 and 3).
  • the opposite axial ends of the chamber 11 are closed by covers or end walls I2, 13 (see FIG. 1) which are connected with the housing 10 in suitable manner, for instance by means of nonillustrated bolts or the like.
  • a pair of exteriorly meshing gears l4, 15 is mounted in the chamber 1], being mounted on shafts 16, 17 each of which extends through one of the halves of the chamber 11.
  • the shafts l6 and 17 extend in axial parallelism with one another and are journalled in bores of journalling members, here illustrated as shaftjournalling sleeves 182l, respectively.
  • the sleeves l821 will be of aluminum.
  • FIG. 1 shows that the sleeves I8 and 19 are associated with the gear 14, whereas the sleeves 20, 21 are associated with the gear 15.
  • the sleeves each have axial end faces which face away from the rcspsectively associated gears and which are flush with the plane of the end faces of the housing 10.
  • the cover 13 is provided with a bore 22 through which a drive shaft 23 extends from the gear towards the outside of the housing 10.
  • a sealing ring 24 is provided in the bore 22, to seal the shaft 23 with respect to the cover 13, and thus to seal the interior of the chamber 11 with respect to the exterior of the housing 10.
  • the configuration of the sleeves 18-21 is accommodated to the cross-sectional configuration of the housing 11, i.e. they are cylindrical and are each provided with a flat facet, such facets being in abutment with one another (see FIG. 1).
  • An inlet bore 25 communicates with the chamber 11 at the level of the gears 14, 15. In the same axial direction and also at the level of the gears '14, 15 there is provided an outlet bore 26 which extends from the chamber 11 to the exterior of the housing.
  • FIGS. 1 and 3 show particularly clearly, the axial end faces of the sleeves 18-21 which face away from the respectively associated gears 14, 15 are provided with recesses 27, 28.
  • the recess 27 accommodates a sealing element 29, and the recess 28 accommodates a similar sealing element 30.
  • Both of these sealing elements have a contour which approximately resembles a numeral 3, as clearly shown in the plan view of FIG. 4.
  • the curved portions of the respective sealing elements surround the associated shafts with slight spacing, whereas the free end portions of the sealing elements extend to the inner surface of the circumferential wall bounding the chamber 11, in the direction towards the inlet side of the machine.
  • the free end portions of the sealing elements are formed with nose-like projections 29'. 29 in the case of the sealing element 29.
  • These projections are located in radially outwardly extending terminal portions or zones of the respective recesses 27, 28, zones which are designated with reference numerals 27' and 27" with respect to the recess 27 which is visible in FIG. 3.
  • These zones 27' and 27" are not quite as wide the projections 29', 29", so that the latter are received in these zones under a slight amount of compression.
  • the sealing elements 29, 30 separate -at the axial ends of the sleeves which face away from the respective gears 14, 15 two differential pressure fields from one another.
  • these pressure fields are designated with reference numerals 33 and 34 (compare FIG. 3), and it will be seen that the pressure field 33 the high pressure fieldis in communication with the high-pressure side of the fluid machine via a triangular housing recess 35.
  • the pressure field 34 the low pressure lield is in communication with the low pressure side of the fluid machine via a similar triangular housing recess 36.
  • the scaling elements 29 and 30 are of a material having clastomeric properties, for instance synthetic or natural rubber, or synthetic plastic material. It is desirable to protect them from excessive deformation under the influence of the pressure existing in the pressure fields 34, 35, because this could lead to damage.
  • each sealing element 29, 30 is associated with a supporting member 37, 38, respectively.
  • These supporting members are advantageously of a synthetic plastic material, for example polyamide which has been found suitable for this purpose.
  • One of the supporting members, namely the one designated with reference numeral 37 is illustrated in a plan view in FIG. 5 by way of example, the member 38 being identical with it.
  • the supporting members are each located at that side of the respective sealing element which is directed towards the low pressure field 34.
  • Respective seals 40, 41 are provided at the opposite end faces of the housing 10 and engage the covers 12, 13, respectively, to seal the interior of the chamber with respect to the ambient atmosphere.
  • FIG. 1 shows that the axial end faces of the sleeves 1821 which face the respective covers 12, 13, are formed at the outer circumference with inclined recesses which form a continuous configuration on the respectively adjacent sleeves 18 and 20, and 19 and 21.
  • These recesses are designated with reference numeral 42 for the sleeves 18 and 20, and with reference numeral 43 for the sleeves 19 and 21; they terminate just short of the terminal zones of the recesses 27, 28.
  • the gears 14, 15 will draw pressure fluid in known manner into the chamber 11 through the inlet bore 25, and will expel it through the outlet bore 26 to a non-illustrated user.
  • the suction in the inlet bore 25 is transmitted via the recess 36 into the pressure field 34 which thus is at low pressure.
  • the pressure in the outlet bore 26 is transmitted via the recess 35 to the pressure field 33, radially outwardly of the sealing elements 29, 30 so that high pressure exists in this region and presses the respective sleeves 18-21 into sealing engagement with the associated axial end faces of the gears 14, 15.
  • the high pressure is also transmitted into the pressure spaces 31, 32 which causes the projections 29, 29", 30, 30 of the sealing elements 29, 30 to be pressed radially outwardly against the inner suface of the cireumerential wall bounding the chamber 11. This assures that no pressure fluid can flow from the high pressure field 33 into the low pressure field 34.
  • the recesses 42, 43 which are formed bevels cause a rapid pressure increase in the high pressure field 33, in that they assured that this pressure field cannot receive pressure fluid at a time different from the pressure increase in the pumping chambers defined by the cooperating gear teeth of the gears 14, 15.
  • a fluid machine having a high pressure side and a low pressure side
  • a combination comprising a housing having a chamber which is bounded by a circumferential wall and two opposite end walls; a pair of meshi'ng gears mounted in said chamber for rotation about axially parallel shafts, said gears each having two opposite axail ends; a plurality of shaft-journalling members.
  • each sealing element having free end portions having a nose-like projection and extending to said circumferential wall; and a small pressure space formed gradually adjacent and behind each of said free end portions intermediate 6 the same and the associated recess and being in communication with said high-pressure side so that the pressure of fluid from said high-pressure side will constitute a force to urge said nose-like projections against said circumferential wall and thereby seal said chamher.
  • journalling members are journalling sleeves.
  • sealing elements are of a material having elastomeric properties.
  • said other axial end faces of said jiournalling members are also formed with respective additional recesses located radially outwardly and slightly spaced from the respective first-mentioned recess and extending along the same, each of said additional recesses being in communieation with said high-pressure side and extending to said circumferential wall and having respective ends located closely adjacent to said free end portions of the respectively associated sealing element, so as to assure a rapid pressure increase acting upon said sealing elements.
  • sealing elements each having a side directed towards a lowpressure field formed in said chamber; and further comprising supporting members of synthetic plastic material. each associated with one of said sealing elements for supporting the same against deformation and being located at said side of the respective sealing element which is directed towards said low-pressure field.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rotary Pumps (AREA)
  • Hydraulic Motors (AREA)
US439020A 1973-03-06 1974-02-04 Gear machine with axially movable end wall seal Expired - Lifetime US3891360A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE7308439 1973-03-06

Publications (1)

Publication Number Publication Date
US3891360A true US3891360A (en) 1975-06-24

Family

ID=6637241

Family Applications (1)

Application Number Title Priority Date Filing Date
US439020A Expired - Lifetime US3891360A (en) 1973-03-06 1974-02-04 Gear machine with axially movable end wall seal

Country Status (5)

Country Link
US (1) US3891360A (enExample)
JP (1) JPS5620552Y2 (enExample)
FR (1) FR2221019A7 (enExample)
GB (1) GB1457807A (enExample)
IT (1) IT1011030B (enExample)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4029446A (en) * 1975-01-10 1977-06-14 Robert Bosch G.M.B.H. Sealing arrangement for gear-type fluid displacing machines
EP0028061A1 (en) * 1979-10-29 1981-05-06 General Signal Corporation Gear pump or motor
US4281974A (en) * 1978-09-19 1981-08-04 Kayabakogyokabushikikaisha Seal mechanism in gear pumps or motors
US4309158A (en) * 1978-11-03 1982-01-05 Robert Bosch Gmbh Gear positive displacement machine with U-shaped supporting element for sealing member
US4358260A (en) * 1979-06-16 1982-11-09 Dowty Hydraulic Units Limited Rotary intermeshing gear machine with pressure-balancing including resilient and non-extrudable sealing members
US4455130A (en) * 1981-04-07 1984-06-19 Robert Bosch Gmbh Gear machine with oppositely aligned sealing elements
US4768935A (en) * 1985-10-08 1988-09-06 Atos Oleodinamica S.P.A. Volumetric blade pump for fluid-hydraulic actuation
US5232356A (en) * 1990-02-16 1993-08-03 Kabushiki Kaisha Komatsu Seisakusho Seal device for gear pump
CN103122853A (zh) * 2013-01-11 2013-05-29 徐州科源液压股份有限公司 带压板的高压齿轮泵浮动侧板

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5653096Y2 (enExample) * 1975-03-20 1981-12-10
FR2543229B1 (fr) * 1983-03-22 1985-08-16 Hydroperfect Int Dispositif pour la compensation hydrostatique de pompes et moteurs hydrauliques du type a engrenage
IT1200232B (it) * 1986-10-20 1989-01-05 Sund Strand Hydratec Spa Macchina ad ingranaggi fungente da pompa o motore
CN103291762B (zh) * 2013-05-13 2016-08-10 合肥力威汽车油泵有限公司 一种耐磨浮动铝合金轴承座及制备方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3137238A (en) * 1961-12-11 1964-06-16 Clark Equipment Co Pump or motor
US3348492A (en) * 1966-12-05 1967-10-24 Borg Warner Reversible wear plate pump
US3371615A (en) * 1967-01-16 1968-03-05 Borg Warner Pressure loaded pump
US3473476A (en) * 1967-11-13 1969-10-21 Lear Siegler Inc Gear pump seal
US3539282A (en) * 1968-04-13 1970-11-10 Bosch Gmbh Robert Gear pump or motor

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3137238A (en) * 1961-12-11 1964-06-16 Clark Equipment Co Pump or motor
US3348492A (en) * 1966-12-05 1967-10-24 Borg Warner Reversible wear plate pump
US3371615A (en) * 1967-01-16 1968-03-05 Borg Warner Pressure loaded pump
US3473476A (en) * 1967-11-13 1969-10-21 Lear Siegler Inc Gear pump seal
US3539282A (en) * 1968-04-13 1970-11-10 Bosch Gmbh Robert Gear pump or motor

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4029446A (en) * 1975-01-10 1977-06-14 Robert Bosch G.M.B.H. Sealing arrangement for gear-type fluid displacing machines
US4281974A (en) * 1978-09-19 1981-08-04 Kayabakogyokabushikikaisha Seal mechanism in gear pumps or motors
US4309158A (en) * 1978-11-03 1982-01-05 Robert Bosch Gmbh Gear positive displacement machine with U-shaped supporting element for sealing member
US4358260A (en) * 1979-06-16 1982-11-09 Dowty Hydraulic Units Limited Rotary intermeshing gear machine with pressure-balancing including resilient and non-extrudable sealing members
EP0028061A1 (en) * 1979-10-29 1981-05-06 General Signal Corporation Gear pump or motor
US4455130A (en) * 1981-04-07 1984-06-19 Robert Bosch Gmbh Gear machine with oppositely aligned sealing elements
US4768935A (en) * 1985-10-08 1988-09-06 Atos Oleodinamica S.P.A. Volumetric blade pump for fluid-hydraulic actuation
US5232356A (en) * 1990-02-16 1993-08-03 Kabushiki Kaisha Komatsu Seisakusho Seal device for gear pump
CN103122853A (zh) * 2013-01-11 2013-05-29 徐州科源液压股份有限公司 带压板的高压齿轮泵浮动侧板

Also Published As

Publication number Publication date
GB1457807A (en) 1976-12-08
IT1011030B (it) 1977-01-20
JPS5620552Y2 (enExample) 1981-05-15
FR2221019A7 (enExample) 1974-10-04
JPS49146507U (enExample) 1974-12-18

Similar Documents

Publication Publication Date Title
US3891360A (en) Gear machine with axially movable end wall seal
US3961872A (en) Gear machine with fluid-biased end face sealing elements
GB1159315A (en) Improvements in and relating to Gear Pumps and Motors
GB965256A (en) Rotary pump or motor
US3482524A (en) Pump or motor
GB1390631A (en) Rotary positive-displacement fluid machine
US2240056A (en) Eccentric gear pump
ES406778A1 (es) Una disposicion de aro de retencion de aceite para uso en motores de combustion interna de piston rotativo.
US2477797A (en) Gear pump with wear compensating means
US3539282A (en) Gear pump or motor
US3909165A (en) Geared hydraulic apparatus
US3315609A (en) Wear-compensating high efficiency gear pump
GB769763A (en) Improvements in or relating to gear pumps
GB1079127A (en) Rotary piston machines
ES412048A1 (es) Una disposicion de bomba de engranajes de alta presion.
GB1206524A (en) Hydraulic gear pumps and motors
US3433168A (en) Gear pump with takeup for wear
US3912427A (en) High pressure gear pump
GB1269643A (en) Internally-meshing gear pumps and motors
US3373693A (en) Pumps
US4281974A (en) Seal mechanism in gear pumps or motors
GB1148600A (en) Improvements in and relating to internally meshing gear pumps
US3296977A (en) Pressure loaded pump
GB1191472A (en) Improvements in or relating to High Pressure Internally Meshing Gear Pumps or Motors
GB1293697A (en) Improvements in and relating to gearwheel pumps and motors