US3915604A - Seal block device for use in oil hydraulic gear pump - Google Patents

Seal block device for use in oil hydraulic gear pump Download PDF

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Publication number
US3915604A
US3915604A US461794A US46179474A US3915604A US 3915604 A US3915604 A US 3915604A US 461794 A US461794 A US 461794A US 46179474 A US46179474 A US 46179474A US 3915604 A US3915604 A US 3915604A
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US
United States
Prior art keywords
seal block
seal
gear
face
pump
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
US461794A
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English (en)
Inventor
Yasuo Kitta
Sumio Sugahara
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.)
Komatsu Ltd
Original Assignee
Komatsu Ltd
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 Komatsu Ltd filed Critical Komatsu Ltd
Application granted granted Critical
Publication of US3915604A publication Critical patent/US3915604A/en
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
    • F04C15/0007—Radial sealings for working fluid
    • F04C15/0019—Radial sealing elements specially adapted for intermeshing-engagement type machines or pumps, e.g. gear machines or pumps

Definitions

  • a seal block device for use in an oil hydraulic gear pump which comprises a seal block adapted to be interposed between the inner peripheral surface of a pump casing near an oil outlet port of the pump and drive and driven gears which are so provided within the pump casing as to mesh with each other.
  • a first communicating means communicates with a pressure receiving chamber formed by the side of the drive gear in the outer peripheral surface of the seal block and a space defined by and between the driven gear and a seal face of the seal block facing the driven gear, and a second communicating means for communicating with another pressure receiving chamber formed by the side of the driven gear in the outer peripheral surface of the seal block and a space defined by and between the drive gear and another seal face of the seal block facing the drive gear.
  • the present invention relates to a seal block device for use in an oil hydraulic gear pump, and more particularly to a seal block device by which the seal block is prevented from the phenomenon of one-sided contact with drive and driven gears.
  • the present invention is intended to eliminate the above described disadvantages of the conventional seal block device for use in an oil hydraulic gear pump.
  • the seal block device for use in an oil hydraulic gear pump comprises a seal block adapted to be interposed between the inner peripheral surface of a pump casing near the oil outlet port of the pump and drive and driven gears which are so provided within the pump casing as to mesh with each other.
  • a second communicating means communicates with another pressure receiving chamber formed by the side of the driven gear in the outer peripheral surface of the seal block and a space defined by and between the drive gear and another seal face formed by the side of the drive gear on the inner surface: of the seal block and having a circular arc shape in its cross section.
  • the above described seal block device is so constructed that the distance between the respective circular arc centers of the seal faces is equal to or shorter than the distance between the longitudinal axes of the shafts of the drive and driven gears.
  • the above described first communicating means consists of a conduit hole formed within the seal block, one end thereof opening into the pressure receiving chamber formed by the side of the drive gear, and another conduit hole formed within a side plate of the gear pump so as to communicate with the conduit hole formed within the seal block, one end thereof opening into the spaced defined by and between the driven gear and the seal face formed by the side of the driven gear on the inner surface: of the seal block
  • the above described second communicating means consists of a conduit hole formed within the seal block, one end thereof opening into the pressure receiving chamber formed by the side of the driven gear, and another conduit hole formed within another side plate of the pump so as to communicate with the conduit hole formed within the seal block, one end thereof opening into the space defined by and between the drive gear and the seal face formed by the side of the drive gear on the inner surface of the seal block.
  • FIG. 1 is an explanatory view of the structure of a seal block device according to one embodiment of the present invention provided in an oil hydraulic gear P p
  • FIG. 2 is a sectional view of the device taken along line II-II in FIG. 1,
  • FIG. 3 is a front view of a seal block interposed between side housings
  • FIG. 4 is a view for explaining the function of the seal block device according to the present invention.
  • FIG. 5 is a view for explaining another example of seal block device.
  • FIG. 6 is a view for explaining the function of the seal block device shown in FIG. 5.
  • numeral 1 represents a center housing for a casing of an oil hydraulic gear pump.
  • the casing consists of the center housing 1 and cable plates 14 and 15 which are located on the opposite sides thereof and is provided with an inlet port 2 and an outlet port 3 for oil.
  • the casing houses therein a drive gear 4 and a driven gear 5 which are meshed with each other. Between the drive gear 4, the driven gear 5 and the inner peripheral surface of the casing near by the outlet port 3, a seal block 6 is interposed.
  • a pressure receiving chamber 7 is formed at the central portion thereof, a pressure receiving chamber 8 is formed by the side of the drive gear 4 and a pressure receiving chamber 9 isformed by the side of the drive gear 5 wherein the pressure receiving chambers 8 and 9 are located on the opposite sides to each other.
  • the pressure receiving chamber 7 is provided with an oil outlet port 10a.
  • a seal face 10 formed by the side of the drive gear 4, having a circular arc shape in its cross section and a seal face 11 formed by the side of the driven gear 5, having a circular arc shape in its cross section also.
  • conduit holes 12 and 13 are provided within the seal block 6, there are provided.
  • conduit hole 12 opens into the pressure receiving chamber 9, and the other end thereof opens into the side face 6a of the seal block 6. (on the right side of the seal block in FIG. 3) While, one end of the conduit hole 13 opens into the pressure receiving chamber 8 and the other end thereof opens into the other side face 6b of the seal block 6. (on the left side of the seal block 6 in FIG. 3)
  • conduit holes 16 and 17 are provided within the side plates 14 and 15 in which the drive and driven gears 4, 5 are rotated in sliding contact therewith.
  • One end of the conduit hole 16 opens into the inner face of the side housing 14 so as to communicate with the conduit hole 12 formed within the seal block 6, and the other end thereof opens into a space 4a defined by and between the seal face 10 and the drive gear 4, which is rotated in a sliding contact therewith, such as tooth grooves of the drive gear 4.
  • conduit hole 17 opens into the inner face of the side housing 15 so as to communicate with the conduit hole 13 formed within the seal block 6, and the other end thereof opens into a space 5a, such as tooth grooves of the driven gear 5, defined by and between the seal face 11 and the driven gear 5 which is rotated in a sliding contact therewith.
  • the low pressure P acts on the pressure receiving chamber 9 formed by the side of the driven gear 5 through the conduit holes 16 and 12, while the high pressure P exerts on the pressure receiving chamber 8 formed by the side of the drive gear 4 on the inner surface of the seal block 6 through the conduit holes 17 and 13.
  • the distance L GAG between the respective centers 0 and 0 of the circular arcs of the seal faces 10 and 11 is equal to or shorter than the distance L, (TL (T between the respective longitudinal axes O and O of the drive and driven gears 4 and 5.
  • a seal block 6 in which the distance L (0 0 between the respective centers O', and 0' of the circular arcs of the seal faces 10' and 11 is longer than the distance L (O' O between the respective longitudinal axes O, and 0' of the drive and driven gears 4 and 5.
  • the seal block 6' is brought into one-sided contact with the drive gear 4 and the driven gear 5, re spectively, at the ends A and B of the seal block 6 as shown in FIG.
  • the seal block device of the present invention it is possible to provide the seal block with a restoring force which enables it to restore to its normal position whenever the seal block is brought into one-sided contact with the drive and driven gears.
  • a seal block device for use in an oil hydraulic gear pump including a seal block positioned between the inner peripheral surface of a casing of the pump and a drive and a driven meshing gears positioned within a portion of the casing, the improvement comprising a first communicating means for communicating only with a pressure receiving chamber formed on the side of said drive gear on the outer peripheral surface of said seal block and a space between said driven gear and a seal face formed on the side of said driven gear on the inner surface of said seal block having a circular arc shape in its cross section, and a second communicating means for communicating only with another pressure receiving chamber formed on the side of said driven gear on the outer peripheral surface of said block and a space between said drive gear and a seal face formed on the side of said drive gear on the inner surface of said seal block and having a circular arc shape in its cross section.
  • said first communicating means comprises a first conduit hole formed within said seal block, one end thereof opening into said pressure receiving chamber formed by the side of said drive gear andthe other end opening into a side face of said seal block, and a second conduit hole formed within a first side plate of said pump, one end thereof opening into the inner face of said first side housing so as to communicate with said first conduit hole and the other end opening into said space between said driven gear and said seal face which are slidingly contacted with each other
  • said second communicating means comprises a third conduit hole formed within said seal block, one end thereof opening into said pressure receiving chamber formed by the side of said driven gear and the other end opening into another side face of said seal block, and a fourth conduit hole formed within a second side plate of said pump, one end thereof opening into the inner face of said second side housing as to communicate with said third conduit hole and the other end opening into said space between said drive gear and said seal face of the seal block which are slidingly contacted with each other.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rotary Pumps (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)
US461794A 1973-04-20 1974-04-17 Seal block device for use in oil hydraulic gear pump Expired - Lifetime US3915604A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1973046596U JPS5346569Y2 (enrdf_load_stackoverflow) 1973-04-20 1973-04-20

Publications (1)

Publication Number Publication Date
US3915604A true US3915604A (en) 1975-10-28

Family

ID=12751667

Family Applications (1)

Application Number Title Priority Date Filing Date
US461794A Expired - Lifetime US3915604A (en) 1973-04-20 1974-04-17 Seal block device for use in oil hydraulic gear pump

Country Status (3)

Country Link
US (1) US3915604A (enrdf_load_stackoverflow)
JP (1) JPS5346569Y2 (enrdf_load_stackoverflow)
GB (1) GB1472194A (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4266915A (en) * 1978-07-10 1981-05-12 Tyrone Hydraulics Inc. Gear pumps and motors
WO1982001571A1 (en) * 1980-10-28 1982-05-13 Tyrone Hydraulics Improvements in gear pumps and motors
US20070231169A1 (en) * 2004-04-30 2007-10-04 Hitachi, Ltd. Gear Pump and Method of Producing the Same

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3211726A1 (de) * 1981-03-31 1983-02-03 Kayabakogyokabushikikaisha, Tokyo Dichtungsblock fuer zahnradpumpen oder -motoren

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3472170A (en) * 1965-10-12 1969-10-14 Otto Eckerle High pressure gear pump or motor with compensation for play and wear
US3597130A (en) * 1968-08-19 1971-08-03 Otto Eckerle High-pressure gear pump or gear motor with compensation for clearance and wear
US3838952A (en) * 1972-01-17 1974-10-01 Komatsu Mfg Co Ltd Gear pump and motor having a sealed lock for preventing hydraulic oil from leaking between the ends of the teeth of the gears

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3472170A (en) * 1965-10-12 1969-10-14 Otto Eckerle High pressure gear pump or motor with compensation for play and wear
US3597130A (en) * 1968-08-19 1971-08-03 Otto Eckerle High-pressure gear pump or gear motor with compensation for clearance and wear
US3838952A (en) * 1972-01-17 1974-10-01 Komatsu Mfg Co Ltd Gear pump and motor having a sealed lock for preventing hydraulic oil from leaking between the ends of the teeth of the gears

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4266915A (en) * 1978-07-10 1981-05-12 Tyrone Hydraulics Inc. Gear pumps and motors
US4336005A (en) * 1979-04-13 1982-06-22 Tyrone Hydraulics, Inc. Gear pumps and motors
WO1982001571A1 (en) * 1980-10-28 1982-05-13 Tyrone Hydraulics Improvements in gear pumps and motors
US20070231169A1 (en) * 2004-04-30 2007-10-04 Hitachi, Ltd. Gear Pump and Method of Producing the Same
US7789642B2 (en) * 2004-04-30 2010-09-07 Hitachi, Ltd. Gear pump and method of producing the same

Also Published As

Publication number Publication date
DE2419002B2 (de) 1976-04-22
GB1472194A (en) 1977-05-04
JPS49150003U (enrdf_load_stackoverflow) 1974-12-25
DE2419002A1 (de) 1974-10-31
JPS5346569Y2 (enrdf_load_stackoverflow) 1978-11-08

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