US3592105A - Hydrostatic pump or motor with spherical piston - Google Patents

Hydrostatic pump or motor with spherical piston Download PDF

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Publication number
US3592105A
US3592105A US842522A US3592105DA US3592105A US 3592105 A US3592105 A US 3592105A US 842522 A US842522 A US 842522A US 3592105D A US3592105D A US 3592105DA US 3592105 A US3592105 A US 3592105A
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US
United States
Prior art keywords
piston
ball
spherical
space
force
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
US842522A
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English (en)
Inventor
Per Fryklund
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ABB Norden Holding AB
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ASEA AB
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 ASEA AB filed Critical ASEA AB
Application granted granted Critical
Publication of US3592105A publication Critical patent/US3592105A/en
Anticipated expiration legal-status Critical
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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
    • 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
    • F04B1/122—Details or component parts, e.g. valves, sealings or lubrication means
    • F04B1/124—Pistons
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01B—MACHINES OR ENGINES, IN GENERAL OR OF POSITIVE-DISPLACEMENT TYPE, e.g. STEAM ENGINES
    • F01B3/00—Reciprocating-piston machines or engines with cylinder axes coaxial with, or parallel or inclined to, main shaft axis
    • F01B3/0032—Reciprocating-piston machines or engines with cylinder axes coaxial with, or parallel or inclined to, main shaft axis having rotary cylinder block
    • F01B3/0044—Component parts, details, e.g. valves, sealings, lubrication
    • F01B3/0052—Cylinder barrel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01B—MACHINES OR ENGINES, IN GENERAL OR OF POSITIVE-DISPLACEMENT TYPE, e.g. STEAM ENGINES
    • F01B3/00—Reciprocating-piston machines or engines with cylinder axes coaxial with, or parallel or inclined to, main shaft axis
    • F01B3/0082—Details
    • F01B3/0085—Pistons

Definitions

  • ABSTRACT A hydraulic energy converting device applicable to both pumps and motors, such devices employing an obliquely pivoted swash plate to interact with a spherical piston.
  • the axial component of the force on the piston causes wear. This wear is minimized by providing a bowl-shaped piston with a ball-contacting seat and interposing a ball between the piston and the swash plate.
  • Pressure-communicating arrangements in the piston permit fluid pressure and the ball to interact directly, minimizing the force of contact between ball and seat.
  • the present invention relates to an hydraulic energy converting device, that is, a pump or motor having at least one operating cylinder with an axially reciprocating, slidably mounted spherical piston driven by a cam disc a so-called swash plate or by a disc which is mounted obliquely in relation to the cylinder.
  • a pump or motor having at least one operating cylinder with an axially reciprocating, slidably mounted spherical piston driven by a cam disc a so-called swash plate or by a disc which is mounted obliquely in relation to the cylinder.
  • the cylinders may either be parallel with or perpendicular to the axis of rotation of the pump.
  • the cam disc may be situated either inside or outside the pump housing with the operating cylinders.
  • a pump or motor is obtained having most of the advantages of the ball motors heretofore shown in the form of simplicity and cheapness, but without all of their disadvantages.
  • a spherical piston is constructed with a seat for a ball running in the same cylinder as the piston, through which the camming means such as a driving force is transmitted between the driving disc or swash plate and the piston.
  • the seat is spherically annular and the piston bowl shaped so that a space is formed between the ball and the piston inside the contact surface. This space is in communication with the space in front of the piston by means of a channel in the piston so that a considerable part of the force of interaction between ball and cam disc is balanced by the pressure medium.
  • FIG. I shows a cylinder with piston and ball in perfect condition
  • FIG. 2 the same cylinder when the ball and cylinder have become considerably worn.
  • 1 designates a part of a pump or motor housing, not otherwise shown, having an operating cylinder 2 in which run a spherical piston 3 and a ball 4 which interacts with a swash plate 5 which, when it pivots, drives or is driven by the piston 3 via the ball 4.
  • the piston 3 is bowl shaped and has an annular seat 6 so that a space 7 is formed inside the seat between the piston and the ball, the space 7 communicating through a channel 8 with the space 9 in the cylinder 2 in front of the piston 3.
  • the space 9 is in communication through valves, not shown, in the channel 10 with a container and, for example a pressure accumulator.
  • the piston is shown in its outmost position, but its innermost position is indicated in the drawings by the dotted line 11. In FIG.
  • the ball has worn a groove 12 in the wall subjected to lateral pressure from the ball.
  • a gap 13 has thus been formed between the ball and the cylinder wall, which is widest opposite the groove 12.
  • the piston 3 is not subjected to any lateral force so that its wear is negligible.
  • the piston is spherical an inclination such as that in FIG. 2 is of no importance.
  • the pressure medium influences piston and ball with force symbolized by arrows. Thanks to the connection between the spaces 7 and 9 a considerable part of the force is transferred between the ball and the piston through the pressure medium enclosed in the space 7.
  • the contact pressure between the ball and the seat 6 can thus be kept so low that the ball can easily rotate in the seat so that it becomes evenly worn and does not cut when it rotates.
  • the wall between the seat 6 and the front surface of the piston can be given such a thickness that the rear part of the piston, because of the pressure in the space 7, expands depending on the pressure in the cylinder so that the clearance between piston and cylinder wall decreases at increasing pressure.
  • the wall immediately below the ball may be'made slightly conical with a cone angle determined by the greatest inclination likely to occur.
  • the diameter of the seat can thus be increased and most of the load between ball and piston can thus be hydraulically balanced.
  • an hydraulic energy converting device having at least one operating cylinder with a piston reciprocable therein and having a spherical surface engaging the cylinder wall, camming means, a ball between said piston and said camming means for transmitting driving forces between said camming means and said piston, the improvement wherein said spherical piston contains a concave seat for said force-transmitting ball.
  • said concave seat includes an annular, spherical contact surface, whereby a space is defined between said ball seated on said contact surface and said piston.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • Hydraulic Motors (AREA)
US842522A 1968-07-23 1969-07-17 Hydrostatic pump or motor with spherical piston Expired - Lifetime US3592105A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE10013/68A SE312072B (xx) 1968-07-23 1968-07-23

Publications (1)

Publication Number Publication Date
US3592105A true US3592105A (en) 1971-07-13

Family

ID=20291519

Family Applications (1)

Application Number Title Priority Date Filing Date
US842522A Expired - Lifetime US3592105A (en) 1968-07-23 1969-07-17 Hydrostatic pump or motor with spherical piston

Country Status (5)

Country Link
US (1) US3592105A (xx)
DE (1) DE1936328A1 (xx)
FR (1) FR2014687A1 (xx)
GB (1) GB1265057A (xx)
SE (1) SE312072B (xx)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4452310A (en) * 1981-11-17 1984-06-05 Camco, Incorporated Metal-to-metal high/low pressure seal
US5601417A (en) * 1995-11-21 1997-02-11 Ball Bearing Pump, Inc. Hydraulic pump with ball bearing pistons
US6016739A (en) * 1995-06-07 2000-01-25 Sundstrand Corporation Piston and method for reducing wear
US20100139980A1 (en) * 2008-12-04 2010-06-10 Fabio Neves Ball piston steering devices and methods of use
CN113994091A (zh) * 2019-06-19 2022-01-28 穆格股份有限公司 具有球形活塞的径向活塞机

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51121803A (en) * 1975-04-16 1976-10-25 Kamizaki Kokyu Koki Seisakusho Kk An axial plunger type oil hydyaulic equipment

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US459735A (en) * 1891-09-22 Island
US1325434A (en) * 1919-12-16 carey and a
US2712794A (en) * 1949-06-15 1955-07-12 Marion W Humphreys Fluid motor or pump
US3056357A (en) * 1958-12-01 1962-10-02 Gen Motors Corp Radial ball piston pump
US3264951A (en) * 1964-01-17 1966-08-09 Berg Mfg & Sales Co Brake actuator
US3366017A (en) * 1965-02-11 1968-01-30 Nat Res Dev Ball piston hydrostatic machines
US3435774A (en) * 1966-12-01 1969-04-01 Benton Harbor Eng Works Inc Hydraulic pump or motor
US3435775A (en) * 1967-11-13 1969-04-01 Benton Harbor Eng Works Inc Hydraulic pump or motor

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US459735A (en) * 1891-09-22 Island
US1325434A (en) * 1919-12-16 carey and a
US2712794A (en) * 1949-06-15 1955-07-12 Marion W Humphreys Fluid motor or pump
US3056357A (en) * 1958-12-01 1962-10-02 Gen Motors Corp Radial ball piston pump
US3264951A (en) * 1964-01-17 1966-08-09 Berg Mfg & Sales Co Brake actuator
US3366017A (en) * 1965-02-11 1968-01-30 Nat Res Dev Ball piston hydrostatic machines
US3435774A (en) * 1966-12-01 1969-04-01 Benton Harbor Eng Works Inc Hydraulic pump or motor
US3435775A (en) * 1967-11-13 1969-04-01 Benton Harbor Eng Works Inc Hydraulic pump or motor

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4452310A (en) * 1981-11-17 1984-06-05 Camco, Incorporated Metal-to-metal high/low pressure seal
US6016739A (en) * 1995-06-07 2000-01-25 Sundstrand Corporation Piston and method for reducing wear
US5601417A (en) * 1995-11-21 1997-02-11 Ball Bearing Pump, Inc. Hydraulic pump with ball bearing pistons
US20100139980A1 (en) * 2008-12-04 2010-06-10 Fabio Neves Ball piston steering devices and methods of use
US8157024B2 (en) * 2008-12-04 2012-04-17 Schlumberger Technology Corporation Ball piston steering devices and methods of use
US8474552B2 (en) 2008-12-04 2013-07-02 Schlumberger Technology Corporation Piston devices and methods of use
CN113994091A (zh) * 2019-06-19 2022-01-28 穆格股份有限公司 具有球形活塞的径向活塞机

Also Published As

Publication number Publication date
DE1936328A1 (de) 1970-10-01
GB1265057A (xx) 1972-03-01
FR2014687A1 (xx) 1970-04-17
SE312072B (xx) 1969-06-30

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