US20060024172A1 - Sealing ring for a swinging yoke hydrostatic unit - Google Patents

Sealing ring for a swinging yoke hydrostatic unit Download PDF

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Publication number
US20060024172A1
US20060024172A1 US10/909,771 US90977104A US2006024172A1 US 20060024172 A1 US20060024172 A1 US 20060024172A1 US 90977104 A US90977104 A US 90977104A US 2006024172 A1 US2006024172 A1 US 2006024172A1
Authority
US
United States
Prior art keywords
seal
manifold
yoke
trunnion
hydrostatic transmission
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.)
Abandoned
Application number
US10/909,771
Other languages
English (en)
Inventor
Wayne Macal
Carolann Kersey
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 Power Solutions Inc
Original Assignee
Sauer Danfoss 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 Sauer Danfoss Inc filed Critical Sauer Danfoss Inc
Priority to US10/909,771 priority Critical patent/US20060024172A1/en
Assigned to SAUER-DANFOSS INC. reassignment SAUER-DANFOSS INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MACAL, WAYNE A., KERSEY, CAROLANN L.
Priority to DE102005034663A priority patent/DE102005034663A1/de
Priority to JP2005217515A priority patent/JP2006046653A/ja
Priority to CN200510091100.0A priority patent/CN1734058A/zh
Publication of US20060024172A1 publication Critical patent/US20060024172A1/en
Abandoned 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
    • F04B27/00—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders
    • F04B27/08—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders coaxial with, or parallel or inclined to, main shaft axis
    • F04B27/0873—Component parts, e.g. sealings; Manufacturing or assembly thereof
    • 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
    • F04B27/00—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders
    • F04B27/08—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders coaxial with, or parallel or inclined to, main shaft axis
    • F04B27/0873—Component parts, e.g. sealings; Manufacturing or assembly thereof
    • F04B27/0891—Component parts, e.g. sealings; Manufacturing or assembly thereof casings, housings

Definitions

  • This invention relates to a sealing system for a swinging yoke hydrostatic unit.
  • Swinging yoke hydrostatic units are very well known in the art as can be seen in U.S. Pat. No. 6,203,283 to Fleming et al. and the U.S. Pat. No. 6,257,119 to Ryken et al.
  • the prior art utilizes a sealing system in its trunnion and manifold that utilizes three seals. Fluid cavities within the trunnion are spaced apart from one another and represent two separate hydraulic fluid lines. Prior art teaches the sealing of these two fluid cavities by using three seals to prevent fluid from these passages from seeping out of the fluid cavities or in between the fluid cavities. This three seal arrangement has proven problematic.
  • the area of deficiency in the three seal arrangement is related specifically to the center seal.
  • the pressure in the fluid cavities fluctuates, causing a significant difference in the pressure between the two cavities. Because of this fact, the cavity containing high pressure fluid transitions between the cavities.
  • the center seal is required to shuttle from one side of the seal mounting groove to the other depending upon which cavity contains the high pressure fluid.
  • seals are designed to have radial grooves on their sideface to facilitate the infusion of pressurized fluid against the side of the seal and into the area where the seal energizer ring is located to hasten the movement of the seal across the groove.
  • the radial grooves on the opposite side of the seal facilitate the evacuation of fluid from the seal cavity as the seal moves across the groove.
  • the seal material will flow to form a uniformly extruded lip in the clearance area between the hydrostatic transmission manifold and the swinging yoke and thus, will effectively seal the path that pressurized fluid must flow to generate the required force to cause the seal to shuttle to the other side of the mounting groove. Consequently, when the seal fails to move, pressure builds upon the seal and eventually the seal can no longer hold back the high pressure and the seal is lifted and thus, a leak path between the high pressure and low pressure side of the hydrostatic loop is created. This condition of the seal being thrust out of the area between the yoke and the housing and lifted thus allowing for the leak is known as “blow-by”.
  • Yet another object of the present invention is to provide a seal that will immediately shuttle from one side of a mounting groove to another while maintaining a leak proof seal on the sealing surface when a pressure reversal within the hydrostatic transmission occurs.
  • the present invention is an improved sealing system for a hydrostatic transmission.
  • the sealing system utilizes an improved seal that is to be placed in a mounting groove of the manifold and is in sealing contact with the swinging yoke trunnion of a hydrostatic transmission.
  • the improved seal has a sideface with a chamfered portion therein and has an irregular shape.
  • the irregular shape can be created by placing a notch in the chamfered portion or by cutting the sideface to form a different angle for the chamfered portion in relation to the sideface.
  • FIG. 1 is a perspective assembly view of a bent axis unit equipped with the sealing system of this invention. Portions have been cut away to expose the sealing system;
  • FIG. 2 is a perspective view of the yoke of this invention
  • FIG. 3 is a sectional view of one embodiment of this invention wherein the chamfered portion of the seal has a notch therein;
  • FIG. 4 is a sectional view of another embodiment of the present invention wherein the sideface of the ring is cut such that the chamfered section of the sideface is present at a new angle;
  • FIG. 5 a sectional view of another alternative embodiment wherein a notch is placed within the manifold of the hydrostatic transmission thus allowing for the seal to be unaltered.
  • FIG. 1 shows the swinging yoke hydrostatic unit 10 that has a yoke 11 pivotally installed in the housing 12 of a bent axis unit 14 having a main shaft 16 .
  • the housing 12 also has a manifold 17 .
  • a rotatable cylinder block kit 18 varies (and thereby the fluid displacement of the unit 14 varies) as the yoke 11 is pivoted by servo means 20 with respect to the housing 12 and the main shaft 16 .
  • the yoke 11 has a central bucket portion 24 adapted to swingably carry the cylinder block kit 18 of the bent axis unit 14 .
  • the yoke 11 also includes a trunnion bearing portion or arm 22 for swinging control on one side of the bucket portion 24 and a trunnion 26 for fluid porting on the other side of the bucket portion 24 .
  • the trunnion 26 has a pair of fluid passages or conduits 28 and 30 that intersect the running surface 32 in the area 34 .
  • the conduits 28 and 30 extend separately and are entirely within the bottom wall 36 , the side wall 38 , and the trunnion for fluid porting 26 .
  • One of the fluid conduits 28 , 30 normally carries high pressured fluid (in the range of 0-550 BAR) when the cylinder block kit 18 rotates in one direction.
  • the other of the fluid conduits 28 , 30 normally carries relatively low pressure fluid, such as control or charge pressure (in the range of 0-25 BAR).
  • control or charge pressure in the range of 0-25 BAR
  • the normal pressures of the bent axis unit 14 may vary, depending upon the system requirements. The invention is applicable to other system pressure requirements with only minor modifications.
  • the conduits 28 , 30 extend across the bottom wall 36 of the yoke 11 . Then the conduits 28 , 30 extend upwardly within the side wall 38 . Near the top of the yoke 11 , gauge ports 40 , 42 can be provided. The gauge ports 40 , 42 extend into the yoke 11 adjacent to the open top 44 so that they intersect the fluid conduits 28 , 30 respectively. The fluid conduits 28 , 30 curve and extend into the trunnion 26 for fluid porting.
  • seals 46 , 48 , and 50 located on the manifold 17 adjacent to the trunnion 26 . Each seal is disposed within a seal mounting groove 54 . For convenience, only seal 48 will be discussed. Seal 48 is located on the exterior side of conduit 28 and on the interior side of fluid conduit 30 thus, representing a center seal. One should appreciate that seal 48 seals fluid from fluid conduits 28 and 30 thus preventing fluid communication therebetween.
  • Mounting groove 54 is disposed within the manifold 17 around the yoke trunnion 26 and has a top or outer surface 56 with an inner open end 58 . Disposed within the mounting groove 54 is an energizer ring 60 that contacts the outer surface 56 and functions to force the seal 48 against the yoke trunnion 26 . Additionally, the space between the yoke trunnion 26 and the manifold 17 forms a clearance space or fluid conduit 62 therebetween.
  • the seal 48 can best be seen in FIG. 3 .
  • the seal 48 has a recessed top surface 64 that receives the energizer ring 60 .
  • the bottom of the seal 66 is ribbed to facilitate sealing and movement.
  • the seal 48 has first and second sidefaces 68 and 70 respectively.
  • the sidefaces 68 and 70 both have a chamfered portion 72 and 74 respectively.
  • the chamfered portions 72 and 78 are of an irregular shape. For example, as shown in FIG. 3 notches 76 and 78 are cut into the chamfered sections 72 and 74 of the sidefaces 68 and 70 .
  • FIG. 3 notches 76 and 78 are cut into the chamfered sections 72 and 74 of the sidefaces 68 and 70 .
  • FIG. 4 shows an alternate embodiment wherein the chamfered portions 72 and 74 are cut such that a space 79 is formed between the sidefaces 68 and 70 when the sidefaces are in sealing engagement with the groove 54 thus, preventing a uniform extrusion.
  • notches 80 and 82 are placed within the manifold adjacent the seal.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Sealing Devices (AREA)
  • Sealing With Elastic Sealing Lips (AREA)
US10/909,771 2004-08-02 2004-08-02 Sealing ring for a swinging yoke hydrostatic unit Abandoned US20060024172A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US10/909,771 US20060024172A1 (en) 2004-08-02 2004-08-02 Sealing ring for a swinging yoke hydrostatic unit
DE102005034663A DE102005034663A1 (de) 2004-08-02 2005-07-25 Dichtungsring für eine hydrostatische Einheit mit schwenkbarem Joch
JP2005217515A JP2006046653A (ja) 2004-08-02 2005-07-27 揺動ヨーク式静圧ユニット用のシール
CN200510091100.0A CN1734058A (zh) 2004-08-02 2005-08-01 用于摇摆轭静液压单元的密封圈

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US10/909,771 US20060024172A1 (en) 2004-08-02 2004-08-02 Sealing ring for a swinging yoke hydrostatic unit

Publications (1)

Publication Number Publication Date
US20060024172A1 true US20060024172A1 (en) 2006-02-02

Family

ID=35732398

Family Applications (1)

Application Number Title Priority Date Filing Date
US10/909,771 Abandoned US20060024172A1 (en) 2004-08-02 2004-08-02 Sealing ring for a swinging yoke hydrostatic unit

Country Status (4)

Country Link
US (1) US20060024172A1 (enExample)
JP (1) JP2006046653A (enExample)
CN (1) CN1734058A (enExample)
DE (1) DE102005034663A1 (enExample)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8096228B1 (en) * 2008-08-08 2012-01-17 Sauer-Danfoss Inc. Bent axis dual yoke hydromodule
CN105518354A (zh) * 2013-07-05 2016-04-20 派克汉泥汾公司 流体静压总成
WO2019137904A1 (de) * 2018-01-12 2019-07-18 Dürr Systems Ag Dichtung

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3268235A (en) * 1965-03-29 1966-08-23 Alphonse A Jacobellis Piston accumulator seal
US3525530A (en) * 1968-06-10 1970-08-25 Gen Motors Corp High pressure-low friction seal
US3614114A (en) * 1969-07-14 1971-10-19 Shamban & Co W S Seal assembly
USRE28105E (en) * 1972-09-22 1974-08-06 Sealing assembly
US4644850A (en) * 1984-12-29 1987-02-24 Hitachi, Ltd. Fluid machine
US5182978A (en) * 1988-10-03 1993-02-02 Hitachi Construction Machinery Co., Ltd. Bent axis type variable displacement hydraulic machine
US5433452A (en) * 1991-04-30 1995-07-18 Busak + Luyken Gmbh & Co. Sealing device
US5495912A (en) * 1994-06-03 1996-03-05 The United States Of America As Represented By The Administrator Of The U.S. Environmental Protection Agency Hybrid powertrain vehicle
US6203283B1 (en) * 1999-02-26 2001-03-20 Sauer Inc. Single piece yoke stroking device for bent axis type hydraulic pumps and variable motors
US6257119B1 (en) * 1999-02-26 2001-07-10 Sauer-Danfoss Inc. Ball joint for servo piston actuation in a bent axis hydraulic unit
US6454272B1 (en) * 1999-06-08 2002-09-24 W. S. Shamban Europa A/S Sealing arrangement and a sealing member therefor

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59101052A (ja) * 1982-11-29 1984-06-11 Matsushita Electric Ind Co Ltd 自動録音停止回路
CN1186528C (zh) * 1999-09-13 2005-01-26 沙厄-丹福丝股份有限公司 弯轴式液压泵和变量马达的单件摆动座式行程调节装置
JP2002295689A (ja) * 2001-03-28 2002-10-09 Nok Corp 密封装置

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3268235A (en) * 1965-03-29 1966-08-23 Alphonse A Jacobellis Piston accumulator seal
US3525530A (en) * 1968-06-10 1970-08-25 Gen Motors Corp High pressure-low friction seal
US3614114A (en) * 1969-07-14 1971-10-19 Shamban & Co W S Seal assembly
USRE28105E (en) * 1972-09-22 1974-08-06 Sealing assembly
US4644850A (en) * 1984-12-29 1987-02-24 Hitachi, Ltd. Fluid machine
US5182978A (en) * 1988-10-03 1993-02-02 Hitachi Construction Machinery Co., Ltd. Bent axis type variable displacement hydraulic machine
US5433452A (en) * 1991-04-30 1995-07-18 Busak + Luyken Gmbh & Co. Sealing device
US5433452C1 (en) * 1991-04-30 2001-06-26 Busak & Shamban Gmbh & Co Sealing device
US5495912A (en) * 1994-06-03 1996-03-05 The United States Of America As Represented By The Administrator Of The U.S. Environmental Protection Agency Hybrid powertrain vehicle
US6203283B1 (en) * 1999-02-26 2001-03-20 Sauer Inc. Single piece yoke stroking device for bent axis type hydraulic pumps and variable motors
US6257119B1 (en) * 1999-02-26 2001-07-10 Sauer-Danfoss Inc. Ball joint for servo piston actuation in a bent axis hydraulic unit
US6454272B1 (en) * 1999-06-08 2002-09-24 W. S. Shamban Europa A/S Sealing arrangement and a sealing member therefor

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8096228B1 (en) * 2008-08-08 2012-01-17 Sauer-Danfoss Inc. Bent axis dual yoke hydromodule
CN105518354A (zh) * 2013-07-05 2016-04-20 派克汉泥汾公司 流体静压总成
CN105518354B (zh) * 2013-07-05 2018-03-20 派克汉泥汾公司 流体静压总成
WO2019137904A1 (de) * 2018-01-12 2019-07-18 Dürr Systems Ag Dichtung
US11624440B2 (en) 2018-01-12 2023-04-11 Dürr Systems Ag Seal

Also Published As

Publication number Publication date
CN1734058A (zh) 2006-02-15
DE102005034663A1 (de) 2006-03-16
JP2006046653A (ja) 2006-02-16

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AS Assignment

Owner name: SAUER-DANFOSS INC., IOWA

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:MACAL, WAYNE A.;KERSEY, CAROLANN L.;REEL/FRAME:015225/0881;SIGNING DATES FROM 20040719 TO 20040720

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION